root/net/if_spppsubr.c

DEFINITIONS

1. spppattach
2. sppp_input
3. sppp_output
4. sppp_attach
5. sppp_detach
6. sppp_flush
7. sppp_isempty
8. sppp_dequeue
9. sppp_pick
10. sppp_ioctl
11. sppp_cisco_input
12. sppp_cisco_send
13. sppp_cp_send
14. sppp_cp_input
15. sppp_up_event
16. sppp_down_event
17. sppp_open_event
18. sppp_close_event
19. sppp_increasing_timeout
20. sppp_to_event
21. sppp_cp_change_state
22. sppp_lcp_init
23. sppp_lcp_up
24. sppp_lcp_down
25. sppp_lcp_open
26. sppp_lcp_close
27. sppp_lcp_TO
28. sppp_lcp_RCR
29. sppp_lcp_RCN_rej
30. sppp_lcp_RCN_nak
31. sppp_lcp_tlu
32. sppp_lcp_tld
33. sppp_lcp_tls
34. sppp_lcp_tlf
35. sppp_lcp_scr
36. sppp_ncp_check
37. sppp_lcp_check_and_close
38. sppp_ipcp_init
39. sppp_ipcp_up
40. sppp_ipcp_down
41. sppp_ipcp_open
42. sppp_ipcp_close
43. sppp_ipcp_TO
44. sppp_ipcp_RCR
45. sppp_ipcp_RCN_rej
46. sppp_ipcp_RCN_nak
47. sppp_ipcp_tlu
48. sppp_ipcp_tld
49. sppp_ipcp_tls
50. sppp_ipcp_tlf
51. sppp_ipcp_scr
52. sppp_chap_input
53. sppp_chap_init
54. sppp_chap_open
55. sppp_chap_close
56. sppp_chap_TO
57. sppp_chap_tlu
58. sppp_chap_tld
59. sppp_chap_scr
60. sppp_pap_input
61. sppp_pap_init
62. sppp_pap_open
63. sppp_pap_close
64. sppp_pap_TO
65. sppp_pap_my_TO
66. sppp_pap_tlu
67. sppp_pap_tld
68. sppp_pap_scr
69. sppp_auth_send
70. sppp_qflush
71. sppp_keepalive
72. sppp_get_ip_addrs
73. sppp_set_ip_addrs
74. sppp_clear_ip_addrs
75. sppp_params
76. sppp_phase_network
77. sppp_cp_type_name
78. sppp_auth_type_name
79. sppp_lcp_opt_name
80. sppp_ipcp_opt_name
81. sppp_state_name
82. sppp_phase_name
83. sppp_proto_name
84. sppp_print_bytes
85. sppp_print_string
86. sppp_dotted_quad
87. sppp_strnlen
88. sppp_null
89. sppp_set_phase

    1 /*      $OpenBSD: if_spppsubr.c,v 1.56 2007/08/28 15:59:18 canacar Exp $        */
    2 /*
    3  * Synchronous PPP/Cisco link level subroutines.
    4  * Keepalive protocol implemented in both Cisco and PPP modes.
    5  *
    6  * Copyright (C) 1994-1996 Cronyx Engineering Ltd.
    7  * Author: Serge Vakulenko, <vak@cronyx.ru>
    8  *
    9  * Heavily revamped to conform to RFC 1661.
   10  * Copyright (C) 1997, Joerg Wunsch.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions are met:
   14  * 1. Redistributions of source code must retain the above copyright notice,
   15  *    this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright notice,
   17  *    this list of conditions and the following disclaimer in the documentation
   18  *    and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY 
   21  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE   
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  *
   32  * From: Version 2.6, Tue May 12 17:10:39 MSD 1998
   33  */
   35 #include <sys/param.h>
   37 #define HIDE
   39 #include <sys/systm.h>
   40 #include <sys/kernel.h>
   41 #include <sys/sockio.h>
   42 #include <sys/socket.h>
   43 #include <sys/syslog.h>
   44 #include <sys/malloc.h>
   45 #include <sys/mbuf.h>
   47 #if defined (__OpenBSD__)
   48 #include <sys/timeout.h>
   49 #include <crypto/md5.h>
   50 #else
   51 #include <sys/md5.h>
   52 #endif
   54 #include <net/if.h>
   55 #include <net/netisr.h>
   56 #include <net/if_types.h>
   57 #include <net/route.h>
   59 /* for arc4random() */
   60 #include <dev/rndvar.h>
   62 #if defined (__FreeBSD__) || defined(__OpenBSD_) || defined(__NetBSD__)
   63 #include <machine/random.h>
   64 #endif
   65 #if defined (__NetBSD__) || defined (__OpenBSD__)
   66 #include <machine/cpu.h> /* XXX for softnet */
   67 #endif
   68 #include <sys/stdarg.h>
   70 #ifdef INET
   71 #include <netinet/in.h>
   72 #include <netinet/in_systm.h>
   73 #include <netinet/in_var.h>
   74 #include <netinet/ip.h>
   75 #include <netinet/tcp.h>
   76 # if defined (__FreeBSD__) || defined (__OpenBSD__)
   77 #  include <netinet/if_ether.h>
   78 # else
   79 #  include <net/ethertypes.h>
   80 # endif
   81 #else
   82 # error Huh? sppp without INET?
   83 #endif
   85 #include <net/if_sppp.h>
   87 #if defined (__FreeBSD__)
   88 # define UNTIMEOUT(fun, arg, handle)    \
untimeout(fun, arg, handle)
   90 #elif defined(__OpenBSD__)
   91 # define UNTIMEOUT(fun, arg, handle)    \
timeout_del(&(handle))
   93 #else
   94 # define UNTIMEOUT(fun, arg, handle)    \
untimeout(fun, arg)
   96 #endif
   98 #define LOOPALIVECNT                    3       /* loopback detection tries */
   99 #define MAXALIVECNT                     3       /* max. missed alive packets */
  100 #define NORECV_TIME                     15      /* before we get worried */
  102 /*
  103  * Interface flags that can be set in an ifconfig command.
  104  *
  105  * Setting link0 will make the link passive, i.e. it will be marked
  106  * as being administrative openable, but won't be opened to begin
  107  * with.  Incoming calls will be answered, or subsequent calls with
  108  * -link1 will cause the administrative open of the LCP layer.
  109  *
  110  * Setting link1 will cause the link to auto-dial only as packets
  111  * arrive to be sent.
  112  *
  113  * Setting IFF_DEBUG will syslog the option negotiation and state
  114  * transitions at level kern.debug.  Note: all logs consistently look
  115  * like
  116  *
  117  *   <if-name><unit>: <proto-name> <additional info...>
  118  *
  119  * with <if-name><unit> being something like "bppp0", and <proto-name>
  120  * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
  121  */
  123 #define IFF_PASSIVE     IFF_LINK0       /* wait passively for connection */
  124 #define IFF_AUTO        IFF_LINK1       /* auto-dial on output */
  126 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
  127 #define PPP_UI          0x03            /* Unnumbered Information */
  128 #define PPP_IP          0x0021          /* Internet Protocol */
  129 #define PPP_ISO         0x0023          /* ISO OSI Protocol */
  130 #define PPP_XNS         0x0025          /* Xerox NS Protocol */
  131 #define PPP_IPX         0x002b          /* Novell IPX Protocol */
  132 #define PPP_LCP         0xc021          /* Link Control Protocol */
  133 #define PPP_PAP         0xc023          /* Password Authentication Protocol */
  134 #define PPP_CHAP        0xc223          /* Challenge-Handshake Auth Protocol */
  135 #define PPP_IPCP        0x8021          /* Internet Protocol Control Protocol */
  137 #define CONF_REQ        1               /* PPP configure request */
  138 #define CONF_ACK        2               /* PPP configure acknowledge */
  139 #define CONF_NAK        3               /* PPP configure negative ack */
  140 #define CONF_REJ        4               /* PPP configure reject */
  141 #define TERM_REQ        5               /* PPP terminate request */
  142 #define TERM_ACK        6               /* PPP terminate acknowledge */
  143 #define CODE_REJ        7               /* PPP code reject */
  144 #define PROTO_REJ       8               /* PPP protocol reject */
  145 #define ECHO_REQ        9               /* PPP echo request */
  146 #define ECHO_REPLY      10              /* PPP echo reply */
  147 #define DISC_REQ        11              /* PPP discard request */
  149 #define LCP_OPT_MRU             1       /* maximum receive unit */
  150 #define LCP_OPT_ASYNC_MAP       2       /* async control character map */
  151 #define LCP_OPT_AUTH_PROTO      3       /* authentication protocol */
  152 #define LCP_OPT_QUAL_PROTO      4       /* quality protocol */
  153 #define LCP_OPT_MAGIC           5       /* magic number */
  154 #define LCP_OPT_RESERVED        6       /* reserved */
  155 #define LCP_OPT_PROTO_COMP      7       /* protocol field compression */
  156 #define LCP_OPT_ADDR_COMP       8       /* address/control field compression */
  158 #define IPCP_OPT_ADDRESSES      1       /* both IP addresses; deprecated */
  159 #define IPCP_OPT_COMPRESSION    2       /* IP compression protocol (VJ) */
  160 #define IPCP_OPT_ADDRESS        3       /* local IP address */
  162 #define PAP_REQ                 1       /* PAP name/password request */
  163 #define PAP_ACK                 2       /* PAP acknowledge */
  164 #define PAP_NAK                 3       /* PAP fail */
  166 #define CHAP_CHALLENGE          1       /* CHAP challenge request */
  167 #define CHAP_RESPONSE           2       /* CHAP challenge response */
  168 #define CHAP_SUCCESS            3       /* CHAP response ok */
  169 #define CHAP_FAILURE            4       /* CHAP response failed */
  171 #define CHAP_MD5                5       /* hash algorithm - MD5 */
  173 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
  174 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
  175 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
  176 #define CISCO_ADDR_REQ          0       /* Cisco address request */
  177 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
  178 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
  180 /* states are named and numbered according to RFC 1661 */
  181 #define STATE_INITIAL   0
  182 #define STATE_STARTING  1
  183 #define STATE_CLOSED    2
  184 #define STATE_STOPPED   3
  185 #define STATE_CLOSING   4
  186 #define STATE_STOPPING  5
  187 #define STATE_REQ_SENT  6
  188 #define STATE_ACK_RCVD  7
  189 #define STATE_ACK_SENT  8
  190 #define STATE_OPENED    9
  192 struct ppp_header {
u_char address;
u_char control;
u_short protocol;
  196 };
  197 #define PPP_HEADER_LEN          sizeof (struct ppp_header)
  199 struct lcp_header {
u_char type;
u_char ident;
u_short len;
  203 };
  204 #define LCP_HEADER_LEN          sizeof (struct lcp_header)
  206 struct cisco_packet {
u_int32_t type;
u_int32_t par1;
u_int32_t par2;
u_short rel;
u_short time0;
u_short time1;
  213 };
  214 #define CISCO_PACKET_LEN 18
  216 /*
  217  * We follow the spelling and capitalization of RFC 1661 here, to make
  218  * it easier comparing with the standard.  Please refer to this RFC in
  219  * case you can't make sense out of these abbreviation; it will also
  220  * explain the semantics related to the various events and actions.
  221  */
  222 struct cp {
u_short proto;          /* PPP control protocol number */
u_char protoidx;        /* index into state table in struct sppp */
u_char flags;
  226 #define CP_LCP          0x01    /* this is the LCP */
  227 #define CP_AUTH         0x02    /* this is an authentication protocol */
  228 #define CP_NCP          0x04    /* this is a NCP */
  229 #define CP_QUAL         0x08    /* this is a quality reporting protocol */
  230         const char *name;       /* name of this control protocol */
  231         /* event handlers */
  232         void    (*Up)(struct sppp *sp);
  233         void    (*Down)(struct sppp *sp);
  234         void    (*Open)(struct sppp *sp);
  235         void    (*Close)(struct sppp *sp);
  236         void    (*TO)(void *sp);
  237         int     (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
  238         void    (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
  239         void    (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
  240         /* actions */
  241         void    (*tlu)(struct sppp *sp);
  242         void    (*tld)(struct sppp *sp);
  243         void    (*tls)(struct sppp *sp);
  244         void    (*tlf)(struct sppp *sp);
  245         void    (*scr)(struct sppp *sp);
  246 };
  248 static struct sppp *spppq;
  249 #if defined (__OpenBSD__)
  250 static struct timeout keepalive_ch;
  251 #endif
  252 #if defined (__FreeBSD__)
  253 static struct callout_handle keepalive_ch;
  254 #endif
  256 #if defined (__FreeBSD__)
  257 #define SPP_FMT         "%s%d: "
  258 #define SPP_ARGS(ifp)   (ifp)->if_name, (ifp)->if_unit
  259 #else
  260 #define SPP_FMT         "%s: "
  261 #define SPP_ARGS(ifp)   (ifp)->if_xname
  262 #endif
  264 /*
  265  * The following disgusting hack gets around the problem that IP TOS
  266  * can't be set yet.  We want to put "interactive" traffic on a high
  267  * priority queue.  To decide if traffic is interactive, we check that
  268  * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
  269  *
  270  * XXX is this really still necessary?  - joerg -
  271  */
  272 static u_short interactive_ports[8] = {
  273         0,      513,    0,      0,
  274         0,      21,     0,      23,
  275 };
  276 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
  278 /* almost every function needs these */
  279 #define STDDCL                                                  \
  280         struct ifnet *ifp = &sp->pp_if;                         \
  281         int debug = ifp->if_flags & IFF_DEBUG
HIDE int sppp_output(struct ifnet *ifp, struct mbuf *m,
  284                        struct sockaddr *dst, struct rtentry *rt);
HIDE void sppp_cisco_send(struct sppp *sp, u_int32_t type, u_int32_t par1, u_int32_t par2);
HIDE void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
HIDE void sppp_cp_input(const struct cp *cp, struct sppp *sp,
  290                           struct mbuf *m);
HIDE void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
u_char ident, u_short len, void *data);
  293 #ifdef notyet
HIDE void sppp_cp_timeout(void *arg);
  295 #endif
HIDE void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
  297                                  int newstate);
HIDE void sppp_auth_send(const struct cp *cp,
  299                            struct sppp *sp, unsigned int type, u_char id,
  300                            ...);
HIDE void sppp_up_event(const struct cp *cp, struct sppp *sp);
HIDE void sppp_down_event(const struct cp *cp, struct sppp *sp);
HIDE void sppp_open_event(const struct cp *cp, struct sppp *sp);
HIDE void sppp_close_event(const struct cp *cp, struct sppp *sp);
HIDE void sppp_increasing_timeout(const struct cp *cp, struct sppp *sp);
HIDE void sppp_to_event(const struct cp *cp, struct sppp *sp);
HIDE void sppp_null(struct sppp *sp);
HIDE void sppp_lcp_init(struct sppp *sp);
HIDE void sppp_lcp_up(struct sppp *sp);
HIDE void sppp_lcp_down(struct sppp *sp);
HIDE void sppp_lcp_open(struct sppp *sp);
HIDE void sppp_lcp_close(struct sppp *sp);
HIDE void sppp_lcp_TO(void *sp);
HIDE int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
HIDE void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
HIDE void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
HIDE void sppp_lcp_tlu(struct sppp *sp);
HIDE void sppp_lcp_tld(struct sppp *sp);
HIDE void sppp_lcp_tls(struct sppp *sp);
HIDE void sppp_lcp_tlf(struct sppp *sp);
HIDE void sppp_lcp_scr(struct sppp *sp);
HIDE void sppp_lcp_check_and_close(struct sppp *sp);
HIDE int sppp_ncp_check(struct sppp *sp);
HIDE void sppp_ipcp_init(struct sppp *sp);
HIDE void sppp_ipcp_up(struct sppp *sp);
HIDE void sppp_ipcp_down(struct sppp *sp);
HIDE void sppp_ipcp_open(struct sppp *sp);
HIDE void sppp_ipcp_close(struct sppp *sp);
HIDE void sppp_ipcp_TO(void *sp);
HIDE int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
HIDE void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
HIDE void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
HIDE void sppp_ipcp_tlu(struct sppp *sp);
HIDE void sppp_ipcp_tld(struct sppp *sp);
HIDE void sppp_ipcp_tls(struct sppp *sp);
HIDE void sppp_ipcp_tlf(struct sppp *sp);
HIDE void sppp_ipcp_scr(struct sppp *sp);
HIDE void sppp_pap_input(struct sppp *sp, struct mbuf *m);
HIDE void sppp_pap_init(struct sppp *sp);
HIDE void sppp_pap_open(struct sppp *sp);
HIDE void sppp_pap_close(struct sppp *sp);
HIDE void sppp_pap_TO(void *sp);
HIDE void sppp_pap_my_TO(void *sp);
HIDE void sppp_pap_tlu(struct sppp *sp);
HIDE void sppp_pap_tld(struct sppp *sp);
HIDE void sppp_pap_scr(struct sppp *sp);
HIDE void sppp_chap_input(struct sppp *sp, struct mbuf *m);
HIDE void sppp_chap_init(struct sppp *sp);
HIDE void sppp_chap_open(struct sppp *sp);
HIDE void sppp_chap_close(struct sppp *sp);
HIDE void sppp_chap_TO(void *sp);
HIDE void sppp_chap_tlu(struct sppp *sp);
HIDE void sppp_chap_tld(struct sppp *sp);
HIDE void sppp_chap_scr(struct sppp *sp);
HIDE const char *sppp_auth_type_name(u_short proto, u_char type);
HIDE const char *sppp_cp_type_name(u_char type);
HIDE const char *sppp_dotted_quad(u_int32_t addr);
HIDE const char *sppp_ipcp_opt_name(u_char opt);
HIDE const char *sppp_lcp_opt_name(u_char opt);
HIDE const char *sppp_phase_name(enum ppp_phase phase);
HIDE const char *sppp_proto_name(u_short proto);
HIDE const char *sppp_state_name(int state);
HIDE int sppp_params(struct sppp *sp, u_long cmd, void *data);
HIDE int sppp_strnlen(u_char *p, int max);
HIDE void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst,
u_int32_t *srcmask);
HIDE void sppp_keepalive(void *dummy);
HIDE void sppp_phase_network(struct sppp *sp);
HIDE void sppp_print_bytes(const u_char *p, u_short len);
HIDE void sppp_print_string(const char *p, u_short len);
HIDE void sppp_qflush(struct ifqueue *ifq);
HIDE void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr,
u_int32_t hisaddr);
HIDE void sppp_clear_ip_addrs(struct sppp *sp);
HIDE void sppp_set_phase(struct sppp *sp);
  384 /* our control protocol descriptors */
  385 static const struct cp lcp = {
PPP_LCP, IDX_LCP, CP_LCP, "lcp",
sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
sppp_lcp_scr
  391 };
  393 static const struct cp ipcp = {
PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
sppp_ipcp_scr
  399 };
  401 static const struct cp pap = {
PPP_PAP, IDX_PAP, CP_AUTH, "pap",
sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
sppp_pap_TO, 0, 0, 0,
sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
sppp_pap_scr
  407 };
  409 static const struct cp chap = {
PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
sppp_chap_TO, 0, 0, 0,
sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
sppp_chap_scr
  415 };
  417 static const struct cp *cps[IDX_COUNT] = {
  418         &lcp,                   /* IDX_LCP */
  419         &ipcp,                  /* IDX_IPCP */
  420         &pap,                   /* IDX_PAP */
  421         &chap,                  /* IDX_CHAP */
  422 };
  425 /*
  426  * Exported functions, comprising our interface to the lower layer.
  427  */
  429 #if defined(__OpenBSD__)
  430 /* Workaround */
  431 void
spppattach(struct ifnet *ifp)
  433 {
  434 }
  435 #endif
  437 /*
  438  * Process the received packet.
  439  */
  440 void
sppp_input(struct ifnet *ifp, struct mbuf *m)
  442 {
  443         struct ppp_header *h, ht;
  444         struct ifqueue *inq = 0;
  445         struct sppp *sp = (struct sppp *)ifp;
  446         struct timeval tv;
  447         int debug = ifp->if_flags & IFF_DEBUG;
  448         int s;
  450         if (ifp->if_flags & IFF_UP) {
  451                 /* Count received bytes, add hardware framing */
ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes;
  453                 /* Note time of last receive */
getmicrouptime(&tv);
sp->pp_last_receive = tv.tv_sec;
  456         }
  458         if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
  459                 /* Too small packet, drop it. */
  460                 if (debug)
log(LOG_DEBUG,
SPP_FMT "input packet is too small, %d bytes\n",
SPP_ARGS(ifp), m->m_pkthdr.len);
drop:
  465                 ++ifp->if_ierrors;
  466                 ++ifp->if_iqdrops;
m_freem (m);
  468                 return;
  469         }
  471         if (sp->pp_flags & PP_NOFRAMING) {
memcpy(&ht.protocol, mtod(m, char *), sizeof(ht.protocol));
m_adj(m, 2);
ht.control = PPP_UI;
ht.address = PPP_ALLSTATIONS;
h = &ht;
  477         } else {
  478                 /* Get PPP header. */
h = mtod (m, struct ppp_header*);
m_adj (m, PPP_HEADER_LEN);
  481         }
  483         /* preserve the alignment */
  484         if (m->m_len < m->m_pkthdr.len) {
m = m_pullup2(m, m->m_pkthdr.len);
  486                 if (m == NULL) {
  487                         if (debug)
log(LOG_DEBUG,
SPP_FMT "Failed to align packet!\n", SPP_ARGS(ifp));
  490                         ++ifp->if_ierrors;
  491                         ++ifp->if_iqdrops;
  492                         return;
  493                 }
  494         }
  496         switch (h->address) {
  497         case PPP_ALLSTATIONS:
  498                 if (h->control != PPP_UI)
  499                         goto invalid;
  500                 if (sp->pp_flags & PP_CISCO) {
  501                         if (debug)
log(LOG_DEBUG,
SPP_FMT "PPP packet in Cisco mode "
  504                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
SPP_ARGS(ifp),
h->address, h->control, ntohs(h->protocol));
  507                         goto drop;
  508                 }
  509                 switch (ntohs (h->protocol)) {
  510                 default:
  511                         if (sp->state[IDX_LCP] == STATE_OPENED)
sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
  513                                     ++sp->pp_seq, 2, &h->protocol);
  514                         if (debug)
log(LOG_DEBUG,
SPP_FMT "invalid input protocol "
  517                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
SPP_ARGS(ifp),
h->address, h->control, ntohs(h->protocol));
  520                         ++ifp->if_noproto;
  521                         goto drop;
  522                 case PPP_LCP:
sppp_cp_input(&lcp, sp, m);
m_freem (m);
  525                         return;
  526                 case PPP_PAP:
  527                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
sppp_pap_input(sp, m);
m_freem (m);
  530                         return;
  531                 case PPP_CHAP:
  532                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
sppp_chap_input(sp, m);
m_freem (m);
  535                         return;
  536 #ifdef INET
  537                 case PPP_IPCP:
  538                         if (sp->pp_phase == PHASE_NETWORK)
sppp_cp_input(&ipcp, sp, m);
m_freem (m);
  541                         return;
  542                 case PPP_IP:
  543                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
schednetisr (NETISR_IP);
inq = &ipintrq;
sp->pp_last_activity = tv.tv_sec;
  547                         }
  548                         break;
  549 #endif
  550                 }
  551                 break;
  552         case CISCO_MULTICAST:
  553         case CISCO_UNICAST:
  554                 /* Don't check the control field here (RFC 1547). */
  555                 if (! (sp->pp_flags & PP_CISCO)) {
  556                         if (debug)
log(LOG_DEBUG,
SPP_FMT "Cisco packet in PPP mode "
  559                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
SPP_ARGS(ifp),
h->address, h->control, ntohs(h->protocol));
  562                         goto drop;
  563                 }
  564                 switch (ntohs (h->protocol)) {
  565                 default:
  566                         ++ifp->if_noproto;
  567                         goto invalid;
  568                 case CISCO_KEEPALIVE:
sppp_cisco_input ((struct sppp*) ifp, m);
m_freem (m);
  571                         return;
  572 #ifdef INET
  573                 case ETHERTYPE_IP:
schednetisr (NETISR_IP);
inq = &ipintrq;
  576                         break;
  577 #endif
  578                 }
  579                 break;
  580         default:        /* Invalid PPP packet. */
invalid:
  582                 if (debug)
log(LOG_DEBUG,
SPP_FMT "invalid input packet "
  585                             "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
SPP_ARGS(ifp),
h->address, h->control, ntohs(h->protocol));
  588                 goto drop;
  589         }
  591         if (! (ifp->if_flags & IFF_UP) || ! inq)
  592                 goto drop;
  594         /* Check queue. */
s = splnet();
  596         if (IF_QFULL (inq)) {
  597                 /* Queue overflow. */
IF_DROP(inq);
splx(s);
  600                 if (debug)
log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
SPP_ARGS(ifp));
  603                 if (!inq->ifq_congestion)
if_congestion(inq);
  605                 goto drop;
  606         }
IF_ENQUEUE(inq, m);
splx(s);
  609 }
  611 /*
  612  * Enqueue transmit packet.
  613  */
HIDE int
sppp_output(struct ifnet *ifp, struct mbuf *m,
  616             struct sockaddr *dst, struct rtentry *rt)
  617 {
  618         struct sppp *sp = (struct sppp*) ifp;
  619         struct ppp_header *h;
  620         struct ifqueue *ifq = NULL;
  621         struct timeval tv;
  622         int s, len, rv = 0;
u_int16_t protocol;
s = splnet();
getmicrouptime(&tv);
sp->pp_last_activity = tv.tv_sec;
  630         if ((ifp->if_flags & IFF_UP) == 0 ||
  631             (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
m_freem (m);
splx (s);
  634                 return (ENETDOWN);
  635         }
  637         if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
  638                 /*
  639                  * Interface is not yet running, but auto-dial.  Need
  640                  * to start LCP for it.
  641                  */
ifp->if_flags |= IFF_RUNNING;
splx(s);
lcp.Open(sp);
s = splnet();
  646         }
  648 #ifdef INET
  649         /*
  650          * Put low delay, telnet, rlogin and ftp control packets
  651          * in front of the queue.
  652          */
  653         if (dst->sa_family == AF_INET) {
  654                 struct ip *ip = NULL;
  655                 struct tcphdr *th = NULL;
  657                 if (m->m_len >= sizeof(struct ip)) {
ip = mtod(m, struct ip *);
  659                         if (ip->ip_p == IPPROTO_TCP &&
m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) +
  661                             sizeof(struct tcphdr)) {
th = (struct tcphdr *)
  663                                     ((caddr_t)ip + (ip->ip_hl << 2));
  664                         }
  665                 }
  666                 /*
  667                  * When using dynamic local IP address assignment by using
  668                  * 0.0.0.0 as a local address, the first TCP session will
  669                  * not connect because the local TCP checksum is computed
  670                  * using 0.0.0.0 which will later become our real IP address
  671                  * so the TCP checksum computed at the remote end will
  672                  * become invalid. So we
  673                  * - don't let packets with src ip addr 0 thru
  674                  * - we flag TCP packets with src ip 0 as an error
  675                  */
  677                 if(ip && ip->ip_src.s_addr == INADDR_ANY) {
u_int8_t proto = ip->ip_p;
m_freem(m);
splx(s);
  682                         if(proto == IPPROTO_TCP)
  683                                 return (EADDRNOTAVAIL);
  684                         else
  685                                 return (0);
  686                 }
  688                 if (!IF_QFULL(&sp->pp_fastq) &&
  689                     ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) ||
  690                       (th && (INTERACTIVE(ntohs(th->th_sport)) ||
INTERACTIVE(ntohs(th->th_dport))))))
ifq = &sp->pp_fastq;
  693         }
  694 #endif
  696         if (sp->pp_flags & PP_NOFRAMING)
  697                 goto skip_header;
  698         /*
  699          * Prepend general data packet PPP header. For now, IP only.
  700          */
M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT);
  702         if (!m) {
  703                 if (ifp->if_flags & IFF_DEBUG)
log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
SPP_ARGS(ifp));
  706                 ++ifp->if_oerrors;
splx (s);
  708                 return (ENOBUFS);
  709         }
  710         /*
  711          * May want to check size of packet
  712          * (albeit due to the implementation it's always enough)
  713          */
h = mtod (m, struct ppp_header*);
  715         if (sp->pp_flags & PP_CISCO) {
h->address = CISCO_UNICAST;        /* unicast address */
h->control = 0;
  718         } else {
h->address = PPP_ALLSTATIONS;        /* broadcast address */
h->control = PPP_UI;                 /* Unnumbered Info */
  721         }
skip_header:
  724         switch (dst->sa_family) {
  725 #ifdef INET
  726         case AF_INET:   /* Internet Protocol */
  727                 if (sp->pp_flags & PP_CISCO)
protocol = htons (ETHERTYPE_IP);
  729                 else {
  730                         /*
  731                          * Don't choke with an ENETDOWN early.  It's
  732                          * possible that we just started dialing out,
  733                          * so don't drop the packet immediately.  If
  734                          * we notice that we run out of buffer space
  735                          * below, we will however remember that we are
  736                          * not ready to carry IP packets, and return
  737                          * ENETDOWN, as opposed to ENOBUFS.
  738                          */
protocol = htons(PPP_IP);
  740                         if (sp->state[IDX_IPCP] != STATE_OPENED)
rv = ENETDOWN;
  742                 }
  743                 break;
  744 #endif
  745         default:
m_freem(m);
  747                 ++ifp->if_oerrors;
splx(s);
  749                 return (EAFNOSUPPORT);
  750         }
  752         if (sp->pp_flags & PP_NOFRAMING) {
M_PREPEND(m, 2, M_DONTWAIT);
  754                 if (m == NULL) {
  755                         if (ifp->if_flags & IFF_DEBUG)
log(LOG_DEBUG, SPP_FMT
  757                                     "no memory for transmit header\n",
SPP_ARGS(ifp));
  759                         ++ifp->if_oerrors;
splx(s);
  761                         return (ENOBUFS);
  762                 }
  763                 *mtod(m, u_int16_t *) = protocol;
  764         } else
h->protocol = protocol;
  767         /*
  768          * Queue message on interface, and start output if interface
  769          * not yet active.
  770          */
len = m->m_pkthdr.len;
  772         if (ifq != NULL
  773 #ifdef ALTQ
  774             && ALTQ_IS_ENABLED(&ifp->if_snd) == 0
  775 #endif
  776                 ) {
  777                 if (IF_QFULL (ifq)) {
IF_DROP (&ifp->if_snd);
m_freem (m);
  780                         if (rv == 0)
rv = ENOBUFS;
  782                 } else
IF_ENQUEUE (ifq, m);
  784         } else
IFQ_ENQUEUE(&ifp->if_snd, m, NULL, rv);
  787         if (rv != 0) {
  788                 ++ifp->if_oerrors;
splx (s);
  790                 return (rv);
  791         }
  793         if (!(ifp->if_flags & IFF_OACTIVE))
  794                 (*ifp->if_start) (ifp);
  796         /*
  797          * Count output packets and bytes.
  798          * The packet length includes header, FCS and 1 flag,
  799          * according to RFC 1333.
  800          */
ifp->if_obytes += len + sp->pp_framebytes;
splx (s);
  803         return (0);
  804 }
  806 void
sppp_attach(struct ifnet *ifp)
  808 {
  809         struct sppp *sp = (struct sppp*) ifp;
  811         /* Initialize keepalive handler. */
  812         if (! spppq) {
  813 #if defined (__FreeBSD__)
keepalive_ch = timeout(sppp_keepalive, 0, hz * 10);
  815 #elif defined(__OpenBSD__)
timeout_set(&keepalive_ch, sppp_keepalive, NULL);
timeout_add(&keepalive_ch, hz * 10);
  818 #endif
  819         }
  821         /* Insert new entry into the keepalive list. */
sp->pp_next = spppq;
spppq = sp;
sp->pp_if.if_type = IFT_PPP;
sp->pp_if.if_output = sppp_output;
IFQ_SET_MAXLEN(&sp->pp_if.if_snd, 50);
sp->pp_fastq.ifq_maxlen = 50;
sp->pp_cpq.ifq_maxlen = 50;
sp->pp_loopcnt = 0;
sp->pp_alivecnt = 0;
sp->pp_last_activity = 0;
sp->pp_last_receive = 0;
sp->pp_seq = 0;
sp->pp_rseq = 0;
sp->pp_phase = PHASE_DEAD;
sp->pp_up = lcp.Up;
sp->pp_down = lcp.Down;
sppp_lcp_init(sp);
sppp_ipcp_init(sp);
sppp_pap_init(sp);
sppp_chap_init(sp);
  844 }
  846 void
sppp_detach(struct ifnet *ifp)
  848 {
  849         struct sppp **q, *p, *sp = (struct sppp*) ifp;
  850         int i;
  852         /* Remove the entry from the keepalive list. */
  853         for (q = &spppq; (p = *q); q = &p->pp_next)
  854                 if (p == sp) {
  855                         *q = p->pp_next;
  856                         break;
  857                 }
  859         /* Stop keepalive handler. */
  860         if (! spppq)
UNTIMEOUT(sppp_keepalive, 0, keepalive_ch);
  863         for (i = 0; i < IDX_COUNT; i++)
UNTIMEOUT((cps[i])->TO, (void *)sp, sp->ch[i]);
UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
  866 }
  868 /*
  869  * Flush the interface output queue.
  870  */
  871 void
sppp_flush(struct ifnet *ifp)
  873 {
  874         struct sppp *sp = (struct sppp*) ifp;
IFQ_PURGE(&sp->pp_if.if_snd);
sppp_qflush (&sp->pp_fastq);
sppp_qflush (&sp->pp_cpq);
  879 }
  881 /*
  882  * Check if the output queue is empty.
  883  */
  884 int
sppp_isempty(struct ifnet *ifp)
  886 {
  887         struct sppp *sp = (struct sppp*) ifp;
  888         int empty, s;
s = splnet();
empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
IFQ_IS_EMPTY(&sp->pp_if.if_snd);
splx(s);
  894         return (empty);
  895 }
  897 /*
  898  * Get next packet to send.
  899  */
  900 struct mbuf *
sppp_dequeue(struct ifnet *ifp)
  902 {
  903         struct sppp *sp = (struct sppp*) ifp;
  904         struct mbuf *m;
  905         int s;
s = splnet();
  908         /*
  909          * Process only the control protocol queue until we have at
  910          * least one NCP open.
  911          *
  912          * Do always serve all three queues in Cisco mode.
  913          */
IF_DEQUEUE(&sp->pp_cpq, m);
  915         if (m == NULL &&
  916             (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) {
IF_DEQUEUE(&sp->pp_fastq, m);
  918                 if (m == NULL)
IFQ_DEQUEUE (&sp->pp_if.if_snd, m);
  920         }
splx(s);
  922         return m;
  923 }
  925 /*
  926  * Pick the next packet, do not remove it from the queue.
  927  */
  928 struct mbuf *
sppp_pick(struct ifnet *ifp)
  930 {
  931         struct sppp *sp = (struct sppp*)ifp;
  932         struct mbuf *m;
  933         int s;
s = splnet();
m = sp->pp_cpq.ifq_head;
  937         if (m == NULL &&
  938             (sp->pp_phase == PHASE_NETWORK ||
  939              (sp->pp_flags & PP_CISCO) != 0))
  940                 if ((m = sp->pp_fastq.ifq_head) == NULL)
IFQ_POLL(&sp->pp_if.if_snd, m);
splx (s);
  943         return (m);
  944 }
  946 /*
  947  * Process an ioctl request.  Called on low priority level.
  948  */
  949 int
sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data)
  951 {
  952         struct ifreq *ifr = (struct ifreq*) data;
  953         struct sppp *sp = (struct sppp*) ifp;
  954         int s, rv, going_up, going_down, newmode;
s = splnet();
rv = 0;
  958         switch (cmd) {
  959         case SIOCAIFADDR:
  960         case SIOCSIFDSTADDR:
  961                 break;
  963         case SIOCSIFADDR:
if_up(ifp);
  965                 /* FALLTHROUGH */
  967         case SIOCSIFFLAGS:
going_up = (ifp->if_flags & IFF_UP) &&
  969                         (ifp->if_flags & IFF_RUNNING) == 0;
going_down = (ifp->if_flags & IFF_UP) == 0 &&
  971                         (ifp->if_flags & IFF_RUNNING);
newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE);
  973                 if (newmode == (IFF_AUTO | IFF_PASSIVE)) {
  974                         /* sanity */
newmode = IFF_PASSIVE;
ifp->if_flags &= ~IFF_AUTO;
  977                 }
  979                 if (going_up || going_down)
  980                         if (!(sp->pp_flags & PP_CISCO))
lcp.Close(sp);
  983                 if (going_up && newmode == 0) {
  984                         /* neither auto-dial nor passive */
ifp->if_flags |= IFF_RUNNING;
  986                         if (!(sp->pp_flags & PP_CISCO))
lcp.Open(sp);
  988                 } else if (going_down) {
sppp_flush(ifp);
ifp->if_flags &= ~IFF_RUNNING;
  991                 }
  992                 break;
  994 #ifdef SIOCSIFMTU
  995         case SIOCSIFMTU:
  996                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) {
splx(s);
  998                         return (EINVAL);
  999                 }
ifp->if_mtu = ifr->ifr_mtu;
 1001                 break;
 1002 #endif
 1003 #ifdef SLIOCSETMTU
 1004         case SLIOCSETMTU:
 1005                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) {
splx(s);
 1007                         return (EINVAL);
 1008                 }
ifp->if_mtu = *(short*)data;
 1010                 break;
 1011 #endif
 1012 #ifdef SIOCGIFMTU
 1013         case SIOCGIFMTU:
ifr->ifr_mtu = ifp->if_mtu;
 1015                 break;
 1016 #endif
 1017 #ifdef SLIOCGETMTU
 1018         case SLIOCGETMTU:
 1019                 *(short*)data = ifp->if_mtu;
 1020                 break;
 1021 #endif
 1022         case SIOCADDMULTI:
 1023         case SIOCDELMULTI:
 1024                 break;
 1026         case SIOCGIFGENERIC:
 1027         case SIOCSIFGENERIC:
rv = sppp_params(sp, cmd, data);
 1029                 break;
 1031         default:
rv = ENOTTY;
 1033         }
splx(s);
 1035         return rv;
 1036 }
 1039 /*
 1040  * Cisco framing implementation.
 1041  */
 1043 /*
 1044  * Handle incoming Cisco keepalive protocol packets.
 1045  */
HIDE void
sppp_cisco_input(struct sppp *sp, struct mbuf *m)
 1048 {
STDDCL;
 1050         struct cisco_packet *h;
u_int32_t me, mymask;
 1053         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
 1054                 if (debug)
log(LOG_DEBUG,
SPP_FMT "cisco invalid packet length: %d bytes\n",
SPP_ARGS(ifp), m->m_pkthdr.len);
 1058                 return;
 1059         }
h = mtod (m, struct cisco_packet*);
 1061         if (debug)
log(LOG_DEBUG,
SPP_FMT "cisco input: %d bytes "
 1064                     "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n",
SPP_ARGS(ifp), m->m_pkthdr.len,
ntohl(h->type), h->par1, h->par2, (u_int)h->rel,
 1067                     (u_int)h->time0, (u_int)h->time1);
 1068         switch (ntohl (h->type)) {
 1069         default:
 1070                 if (debug)
addlog(SPP_FMT "cisco unknown packet type: 0x%x\n",
SPP_ARGS(ifp), ntohl(h->type));
 1073                 break;
 1074         case CISCO_ADDR_REPLY:
 1075                 /* Reply on address request, ignore */
 1076                 break;
 1077         case CISCO_KEEPALIVE_REQ:
sp->pp_alivecnt = 0;
sp->pp_rseq = ntohl (h->par1);
 1080                 if (sp->pp_seq == sp->pp_rseq) {
 1081                         /* Local and remote sequence numbers are equal.
 1082                          * Probably, the line is in loopback mode. */
 1083                         if (sp->pp_loopcnt >= LOOPALIVECNT) {
printf (SPP_FMT "loopback\n",
SPP_ARGS(ifp));
sp->pp_loopcnt = 0;
 1087                                 if (ifp->if_flags & IFF_UP) {
if_down (ifp);
sppp_qflush (&sp->pp_cpq);
 1090                                 }
 1091                         }
 1092                         ++sp->pp_loopcnt;
 1094                         /* Generate new local sequence number */
 1095 #if defined (__FreeBSD__) || defined (__NetBSD__) || defined(__OpenBSD__)
sp->pp_seq = arc4random();
 1097 #else
sp->pp_seq ^= time.tv_sec ^ time.tv_usec;
 1099 #endif
 1100                         break;
 1101                 }
sp->pp_loopcnt = 0;
 1103                 if (! (ifp->if_flags & IFF_UP) &&
 1104                     (ifp->if_flags & IFF_RUNNING)) {
if_up(ifp);
 1106                         if (debug)
log(LOG_INFO, SPP_FMT "up\n", SPP_ARGS(ifp));
 1108                 }
 1109                 break;
 1110         case CISCO_ADDR_REQ:
sppp_get_ip_addrs(sp, &me, 0, &mymask);
 1112                 if (me != 0)
sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
 1114                 break;
 1115         }
 1116 }
 1118 /*
 1119  * Send Cisco keepalive packet.
 1120  */
HIDE void
sppp_cisco_send(struct sppp *sp, u_int32_t type, u_int32_t par1, u_int32_t par2)
 1123 {
STDDCL;
 1125         struct ppp_header *h;
 1126         struct cisco_packet *ch;
 1127         struct mbuf *m;
 1128         struct timeval tv;      
getmicrouptime(&tv);
MGETHDR (m, M_DONTWAIT, MT_DATA);
 1133         if (! m)
 1134                 return;
m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
m->m_pkthdr.rcvif = 0;
h = mtod (m, struct ppp_header*);
h->address = CISCO_MULTICAST;
h->control = 0;
h->protocol = htons (CISCO_KEEPALIVE);
ch = (struct cisco_packet*) (h + 1);
ch->type = htonl (type);
ch->par1 = htonl (par1);
ch->par2 = htonl (par2);
ch->rel = -1;
ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
ch->time1 = htons ((u_short) tv.tv_sec);
 1152         if (debug)
log(LOG_DEBUG, SPP_FMT
 1154                     "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
SPP_ARGS(ifp), ntohl(ch->type), ch->par1, ch->par2,
 1156                         (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
 1158         if (IF_QFULL (&sp->pp_cpq)) {
IF_DROP (&sp->pp_fastq);
IF_DROP (&ifp->if_snd);
m_freem (m);
m = NULL;
 1163         } else
IF_ENQUEUE (&sp->pp_cpq, m);
 1165         if (! (ifp->if_flags & IFF_OACTIVE))
 1166                 (*ifp->if_start) (ifp);
 1167         if (m != NULL)
ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes;
 1169 }
 1171 /*
 1172  * PPP protocol implementation.
 1173  */
 1175 /*
 1176  * Send PPP control protocol packet.
 1177  */
HIDE void
sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
u_char ident, u_short len, void *data)
 1181 {
STDDCL;
 1183         struct ppp_header *h;
 1184         struct lcp_header *lh;
 1185         struct mbuf *m;
size_t pkthdrlen;
pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN;
 1190         if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN)
len = MHLEN - pkthdrlen - LCP_HEADER_LEN;
MGETHDR (m, M_DONTWAIT, MT_DATA);
 1193         if (! m)
 1194                 return;
m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len;
m->m_pkthdr.rcvif = 0;
 1198         if (sp->pp_flags & PP_NOFRAMING) {
 1199                 *mtod(m, u_int16_t *) = htons(proto);
lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2);
 1201         } else {        
h = mtod (m, struct ppp_header*);
h->address = PPP_ALLSTATIONS;   /* broadcast address */
h->control = PPP_UI;            /* Unnumbered Info */
h->protocol = htons (proto);    /* Link Control Protocol */
lh = (struct lcp_header*) (h + 1);
 1207         }
lh->type = type;
lh->ident = ident;
lh->len = htons (LCP_HEADER_LEN + len);
 1211         if (len)
bcopy (data, lh+1, len);
 1214         if (debug) {
log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
SPP_ARGS(ifp),
sppp_proto_name(proto),
sppp_cp_type_name (lh->type), lh->ident,
ntohs (lh->len));
 1220                 if (len)
sppp_print_bytes ((u_char*) (lh+1), len);
addlog(">\n");
 1223         }
 1224         if (IF_QFULL (&sp->pp_cpq)) {
IF_DROP (&sp->pp_fastq);
IF_DROP (&ifp->if_snd);
m_freem (m);
 1228                 ++ifp->if_oerrors;
m = NULL;
 1230         } else
IF_ENQUEUE (&sp->pp_cpq, m);
 1232         if (!(ifp->if_flags & IFF_OACTIVE))
 1233                 (*ifp->if_start) (ifp);
 1234         if (m != NULL)
ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes;
 1236 }
 1238 /*
 1239  * Handle incoming PPP control protocol packets.
 1240  */
HIDE void
sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
 1243 {
STDDCL;
 1245         struct lcp_header *h;
 1246         int len = m->m_pkthdr.len;
 1247         int rv;
u_char *p;
u_long nmagic;
 1251         if (len < 4) {
 1252                 if (debug)
log(LOG_DEBUG,
SPP_FMT "%s invalid packet length: %d bytes\n",
SPP_ARGS(ifp), cp->name, len);
 1256                 return;
 1257         }
h = mtod (m, struct lcp_header*);
 1259         if (debug) {
log(LOG_DEBUG,
SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
SPP_ARGS(ifp), cp->name,
sppp_state_name(sp->state[cp->protoidx]),
sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
 1265                 if (len > 4)
sppp_print_bytes ((u_char*) (h+1), len-4);
addlog(">\n");
 1268         }
 1269         if (len > ntohs (h->len))
len = ntohs (h->len);
p = (u_char *)(h + 1);
 1272         switch (h->type) {
 1273         case CONF_REQ:
 1274                 if (len < 4) {
 1275                         if (debug)
addlog(SPP_FMT "%s invalid conf-req length %d\n",
SPP_ARGS(ifp), cp->name,
len);
 1279                         ++ifp->if_ierrors;
 1280                         break;
 1281                 }
 1282                 /* handle states where RCR doesn't get a SCA/SCN */
 1283                 switch (sp->state[cp->protoidx]) {
 1284                 case STATE_CLOSING:
 1285                 case STATE_STOPPING:
 1286                         return;
 1287                 case STATE_CLOSED:
sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
 1289                                      0, 0);
 1290                         return;
 1291                 }
rv = (cp->RCR)(sp, h, len);
 1293                 /* silently drop illegal packets */
 1294                 if (rv == -1)
 1295                         return;
 1296                 switch (sp->state[cp->protoidx]) {
 1297                 case STATE_OPENED:
sppp_cp_change_state(cp, sp, rv?
STATE_ACK_SENT: STATE_REQ_SENT);
 1300                         (cp->tld)(sp);
 1301                         (cp->scr)(sp);
 1302                         break;
 1303                 case STATE_ACK_SENT:
 1304                 case STATE_REQ_SENT:
sppp_cp_change_state(cp, sp, rv?
STATE_ACK_SENT: STATE_REQ_SENT);
 1307                         break;
 1308                 case STATE_STOPPED:
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
sppp_cp_change_state(cp, sp, rv?
STATE_ACK_SENT: STATE_REQ_SENT);
 1312                         (cp->scr)(sp);
 1313                         break;
 1314                 case STATE_ACK_RCVD:
 1315                         if (rv) {
sppp_cp_change_state(cp, sp, STATE_OPENED);
 1317                                 if (debug)
log(LOG_DEBUG, SPP_FMT "%s tlu\n",
SPP_ARGS(ifp),
cp->name);
 1321                                 (cp->tlu)(sp);
 1322                         } else
sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
 1324                         break;
 1325                 default:
 1326                         /* printf(SPP_FMT "%s illegal %s in state %s\n",
 1327                                SPP_ARGS(ifp), cp->name,
 1328                                sppp_cp_type_name(h->type),
 1329                                sppp_state_name(sp->state[cp->protoidx])); */
 1330                         ++ifp->if_ierrors;
 1331                 }
 1332                 break;
 1333         case CONF_ACK:
 1334                 if (h->ident != sp->confid[cp->protoidx]) {
 1335                         if (debug)
addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
SPP_ARGS(ifp), cp->name,
h->ident, sp->confid[cp->protoidx]);
 1339                         ++ifp->if_ierrors;
 1340                         break;
 1341                 }
 1342                 switch (sp->state[cp->protoidx]) {
 1343                 case STATE_CLOSED:
 1344                 case STATE_STOPPED:
sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
 1346                         break;
 1347                 case STATE_CLOSING:
 1348                 case STATE_STOPPING:
 1349                         break;
 1350                 case STATE_REQ_SENT:
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
 1353                         break;
 1354                 case STATE_OPENED:
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1356                         (cp->tld)(sp);
 1357                         (cp->scr)(sp);
 1358                         break;
 1359                 case STATE_ACK_RCVD:
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1361                         (cp->scr)(sp);
 1362                         break;
 1363                 case STATE_ACK_SENT:
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
sppp_cp_change_state(cp, sp, STATE_OPENED);
 1366                         if (debug)
log(LOG_DEBUG, SPP_FMT "%s tlu\n",
SPP_ARGS(ifp), cp->name);
 1369                         (cp->tlu)(sp);
 1370                         break;
 1371                 default:
 1372                         /* printf(SPP_FMT "%s illegal %s in state %s\n",
 1373                                SPP_ARGS(ifp), cp->name,
 1374                                sppp_cp_type_name(h->type),
 1375                                sppp_state_name(sp->state[cp->protoidx])); */
 1376                         ++ifp->if_ierrors;
 1377                 }
 1378                 break;
 1379         case CONF_NAK:
 1380         case CONF_REJ:
 1381                 if (h->ident != sp->confid[cp->protoidx]) {
 1382                         if (debug)
addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
SPP_ARGS(ifp), cp->name,
h->ident, sp->confid[cp->protoidx]);
 1386                         ++ifp->if_ierrors;
 1387                         break;
 1388                 }
 1389                 if (h->type == CONF_NAK)
 1390                         (cp->RCN_nak)(sp, h, len);
 1391                 else /* CONF_REJ */
 1392                         (cp->RCN_rej)(sp, h, len);
 1394                 switch (sp->state[cp->protoidx]) {
 1395                 case STATE_CLOSED:
 1396                 case STATE_STOPPED:
sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
 1398                         break;
 1399                 case STATE_REQ_SENT:
 1400                 case STATE_ACK_SENT:
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
 1402                         (cp->scr)(sp);
 1403                         break;
 1404                 case STATE_OPENED:
sppp_cp_change_state(cp, sp, STATE_ACK_SENT);
 1406                         (cp->tld)(sp);
 1407                         (cp->scr)(sp);
 1408                         break;
 1409                 case STATE_ACK_RCVD:
sppp_cp_change_state(cp, sp, STATE_ACK_SENT);
 1411                         (cp->scr)(sp);
 1412                         break;
 1413                 case STATE_CLOSING:
 1414                 case STATE_STOPPING:
 1415                         break;
 1416                 default:
 1417                         /* printf(SPP_FMT "%s illegal %s in state %s\n",
 1418                                SPP_ARGS(ifp), cp->name,
 1419                                sppp_cp_type_name(h->type),
 1420                                sppp_state_name(sp->state[cp->protoidx])); */
 1421                         ++ifp->if_ierrors;
 1422                 }
 1423                 break;
 1425         case TERM_REQ:
 1426                 switch (sp->state[cp->protoidx]) {
 1427                 case STATE_ACK_RCVD:
 1428                 case STATE_ACK_SENT:
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1430                         /* FALLTHROUGH */
 1431                 case STATE_CLOSED:
 1432                 case STATE_STOPPED:
 1433                 case STATE_CLOSING:
 1434                 case STATE_STOPPING:
 1435                 case STATE_REQ_SENT:
sta:
 1437                         /* Send Terminate-Ack packet. */
 1438                         if (debug)
log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
SPP_ARGS(ifp), cp->name);
sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
 1442                         break;
 1443                 case STATE_OPENED:
sp->rst_counter[cp->protoidx] = 0;
sppp_cp_change_state(cp, sp, STATE_STOPPING);
 1446                         (cp->tld)(sp);
 1447                         goto sta;
 1448                         break;
 1449                 default:
 1450                         /* printf(SPP_FMT "%s illegal %s in state %s\n",
 1451                                SPP_ARGS(ifp), cp->name,
 1452                                sppp_cp_type_name(h->type),
 1453                                sppp_state_name(sp->state[cp->protoidx])); */
 1454                         ++ifp->if_ierrors;
 1455                 }
 1456                 break;
 1457         case TERM_ACK:
 1458                 switch (sp->state[cp->protoidx]) {
 1459                 case STATE_CLOSED:
 1460                 case STATE_STOPPED:
 1461                 case STATE_REQ_SENT:
 1462                 case STATE_ACK_SENT:
 1463                         break;
 1464                 case STATE_CLOSING:
sppp_cp_change_state(cp, sp, STATE_CLOSED);
 1466                         (cp->tlf)(sp);
 1467                         break;
 1468                 case STATE_STOPPING:
sppp_cp_change_state(cp, sp, STATE_STOPPED);
 1470                         (cp->tlf)(sp);
 1471                         break;
 1472                 case STATE_ACK_RCVD:
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1474                         break;
 1475                 case STATE_OPENED:
sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
 1477                         (cp->tld)(sp);
 1478                         (cp->scr)(sp);
 1479                         break;
 1480                 default:
 1481                         /* printf(SPP_FMT "%s illegal %s in state %s\n",
 1482                                SPP_ARGS(ifp), cp->name,
 1483                                sppp_cp_type_name(h->type),
 1484                                sppp_state_name(sp->state[cp->protoidx])); */
 1485                         ++ifp->if_ierrors;
 1486                 }
 1487                 break;
 1488         case CODE_REJ:
 1489         case PROTO_REJ:
 1490                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
log(LOG_INFO,
SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
 1493                     "danger will robinson\n",
SPP_ARGS(ifp), cp->name,
sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
 1496                 switch (sp->state[cp->protoidx]) {
 1497                 case STATE_CLOSED:
 1498                 case STATE_STOPPED:
 1499                 case STATE_REQ_SENT:
 1500                 case STATE_ACK_SENT:
 1501                 case STATE_CLOSING:
 1502                 case STATE_STOPPING:
 1503                 case STATE_OPENED:
 1504                         break;
 1505                 case STATE_ACK_RCVD:
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1507                         break;
 1508                 default:
 1509                         /* printf(SPP_FMT "%s illegal %s in state %s\n",
 1510                                SPP_ARGS(ifp), cp->name,
 1511                                sppp_cp_type_name(h->type),
 1512                                sppp_state_name(sp->state[cp->protoidx])); */
 1513                         ++ifp->if_ierrors;
 1514                 }
 1515                 break;
 1516         case DISC_REQ:
 1517                 if (cp->proto != PPP_LCP)
 1518                         goto illegal;
 1519                 /* Discard the packet. */
 1520                 break;
 1521         case ECHO_REQ:
 1522                 if (cp->proto != PPP_LCP)
 1523                         goto illegal;
 1524                 if (sp->state[cp->protoidx] != STATE_OPENED) {
 1525                         if (debug)
addlog(SPP_FMT "lcp echo req but lcp closed\n",
SPP_ARGS(ifp));
 1528                         ++ifp->if_ierrors;
 1529                         break;
 1530                 }
 1531                 if (len < 8) {
 1532                         if (debug)
addlog(SPP_FMT "invalid lcp echo request "
 1534                                        "packet length: %d bytes\n",
SPP_ARGS(ifp), len);
 1536                         break;
 1537                 }
nmagic = (u_long)p[0] << 24 |
 1540                     (u_long)p[1] << 16 | p[2] << 8 | p[3];
 1542                 if (nmagic == sp->lcp.magic) {
 1543                         /* Line loopback mode detected. */
printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
 1545                         /* Shut down the PPP link. */
lcp.Close(sp);
 1547                         break;
 1548                 }
p[0] = sp->lcp.magic >> 24;
p[1] = sp->lcp.magic >> 16;
p[2] = sp->lcp.magic >> 8;
p[3] = sp->lcp.magic;
 1555                 if (debug)
addlog(SPP_FMT "got lcp echo req, sending echo rep\n",
SPP_ARGS(ifp));
sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
 1559                 break;
 1560         case ECHO_REPLY:
 1561                 if (cp->proto != PPP_LCP)
 1562                         goto illegal;
 1563                 if (h->ident != sp->lcp.echoid) {
 1564                         ++ifp->if_ierrors;
 1565                         break;
 1566                 }
 1567                 if (len < 8) {
 1568                         if (debug)
addlog(SPP_FMT "lcp invalid echo reply "
 1570                                        "packet length: %d bytes\n",
SPP_ARGS(ifp), len);
 1572                         break;
 1573                 }
 1574                 if (debug)
addlog(SPP_FMT "lcp got echo rep\n",
SPP_ARGS(ifp));
nmagic = (u_long)p[0] << 24 |
 1579                     (u_long)p[1] << 16 | p[2] << 8 | p[3];
 1581                 if (nmagic != sp->lcp.magic)
sp->pp_alivecnt = 0;
 1583                 break;
 1584         default:
 1585                 /* Unknown packet type -- send Code-Reject packet. */
illegal:
 1587                 if (debug)
addlog(SPP_FMT "%s send code-rej for 0x%x\n",
SPP_ARGS(ifp), cp->name, h->type);
sppp_cp_send(sp, cp->proto, CODE_REJ, ++sp->pp_seq,
m->m_pkthdr.len, h);
 1592                 ++ifp->if_ierrors;
 1593         }
 1594 }
 1597 /*
 1598  * The generic part of all Up/Down/Open/Close/TO event handlers.
 1599  * Basically, the state transition handling in the automaton.
 1600  */
HIDE void
sppp_up_event(const struct cp *cp, struct sppp *sp)
 1603 {
STDDCL;
 1606         if (debug)
log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
SPP_ARGS(ifp), cp->name,
sppp_state_name(sp->state[cp->protoidx]));
 1611         switch (sp->state[cp->protoidx]) {
 1612         case STATE_INITIAL:
sppp_cp_change_state(cp, sp, STATE_CLOSED);
 1614                 break;
 1615         case STATE_STARTING:
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1618                 (cp->scr)(sp);
 1619                 break;
 1620         default:
 1621                 /* printf(SPP_FMT "%s illegal up in state %s\n",
 1622                        SPP_ARGS(ifp), cp->name,
 1623                        sppp_state_name(sp->state[cp->protoidx])); */
 1624                 break;
 1625         }
 1626 }
HIDE void
sppp_down_event(const struct cp *cp, struct sppp *sp)
 1630 {
STDDCL;
 1633         if (debug)
log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
SPP_ARGS(ifp), cp->name,
sppp_state_name(sp->state[cp->protoidx]));
 1638         switch (sp->state[cp->protoidx]) {
 1639         case STATE_CLOSED:
 1640         case STATE_CLOSING:
sppp_cp_change_state(cp, sp, STATE_INITIAL);
 1642                 break;
 1643         case STATE_STOPPED:
sppp_cp_change_state(cp, sp, STATE_STARTING);
 1645                 (cp->tls)(sp);
 1646                 break;
 1647         case STATE_STOPPING:
 1648         case STATE_REQ_SENT:
 1649         case STATE_ACK_RCVD:
 1650         case STATE_ACK_SENT:
sppp_cp_change_state(cp, sp, STATE_STARTING);
 1652                 break;
 1653         case STATE_OPENED:
sppp_cp_change_state(cp, sp, STATE_STARTING);
 1655                 (cp->tld)(sp);
 1656                 break;
 1657         default:
 1658                 /* printf(SPP_FMT "%s illegal down in state %s\n",
 1659                        SPP_ARGS(ifp), cp->name,
 1660                        sppp_state_name(sp->state[cp->protoidx])); */
 1661                 break;
 1662         }
 1663 }
HIDE void
sppp_open_event(const struct cp *cp, struct sppp *sp)
 1668 {
STDDCL;
 1671         if (debug)
log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
SPP_ARGS(ifp), cp->name,
sppp_state_name(sp->state[cp->protoidx]));
 1676         switch (sp->state[cp->protoidx]) {
 1677         case STATE_INITIAL:
sppp_cp_change_state(cp, sp, STATE_STARTING);
 1679                 (cp->tls)(sp);
 1680                 break;
 1681         case STATE_STARTING:
 1682                 break;
 1683         case STATE_CLOSED:
sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1686                 (cp->scr)(sp);
 1687                 break;
 1688         case STATE_STOPPED:
 1689         case STATE_STOPPING:
 1690         case STATE_REQ_SENT:
 1691         case STATE_ACK_RCVD:
 1692         case STATE_ACK_SENT:
 1693         case STATE_OPENED:
 1694                 break;
 1695         case STATE_CLOSING:
sppp_cp_change_state(cp, sp, STATE_STOPPING);
 1697                 break;
 1698         }
 1699 }
HIDE void
sppp_close_event(const struct cp *cp, struct sppp *sp)
 1704 {
STDDCL;
 1707         if (debug)
log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
SPP_ARGS(ifp), cp->name,
sppp_state_name(sp->state[cp->protoidx]));
 1712         switch (sp->state[cp->protoidx]) {
 1713         case STATE_INITIAL:
 1714         case STATE_CLOSED:
 1715         case STATE_CLOSING:
 1716                 break;
 1717         case STATE_STARTING:
sppp_cp_change_state(cp, sp, STATE_INITIAL);
 1719                 (cp->tlf)(sp);
 1720                 break;
 1721         case STATE_STOPPED:
sppp_cp_change_state(cp, sp, STATE_CLOSED);
 1723                 break;
 1724         case STATE_STOPPING:
sppp_cp_change_state(cp, sp, STATE_CLOSING);
 1726                 break;
 1727         case STATE_OPENED:
sppp_cp_change_state(cp, sp, STATE_CLOSING);
sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 0, 0);
 1731                 (cp->tld)(sp);
 1732                 break;
 1733         case STATE_REQ_SENT:
 1734         case STATE_ACK_RCVD:
 1735         case STATE_ACK_SENT:
sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 0, 0);
sppp_cp_change_state(cp, sp, STATE_CLOSING);
 1739                 break;
 1740         }
 1741 }
HIDE void
sppp_increasing_timeout (const struct cp *cp, struct sppp *sp)
 1745 {
 1746         int timo;
timo = sp->lcp.max_configure - sp->rst_counter[cp->protoidx];
 1749         if (timo < 1)
timo = 1;
 1751 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
sp->ch[cp->protoidx] = 
timeout(cp->TO, (void *)sp, timo * sp->lcp.timeout);
 1754 #elif defined(__OpenBSD__)
timeout_set(&sp->ch[cp->protoidx], cp->TO, (void *)sp);
timeout_add(&sp->ch[cp->protoidx], timo * sp->lcp.timeout);
 1757 #endif
 1758 }
HIDE void
sppp_to_event(const struct cp *cp, struct sppp *sp)
 1762 {
STDDCL;
 1764         int s;
s = splnet();
 1767         if (debug)
log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
SPP_ARGS(ifp), cp->name,
sppp_state_name(sp->state[cp->protoidx]),
sp->rst_counter[cp->protoidx]);
 1773         if (--sp->rst_counter[cp->protoidx] < 0)
 1774                 /* TO- event */
 1775                 switch (sp->state[cp->protoidx]) {
 1776                 case STATE_CLOSING:
sppp_cp_change_state(cp, sp, STATE_CLOSED);
 1778                         (cp->tlf)(sp);
 1779                         break;
 1780                 case STATE_STOPPING:
sppp_cp_change_state(cp, sp, STATE_STOPPED);
 1782                         (cp->tlf)(sp);
 1783                         break;
 1784                 case STATE_REQ_SENT:
 1785                 case STATE_ACK_RCVD:
 1786                 case STATE_ACK_SENT:
sppp_cp_change_state(cp, sp, STATE_STOPPED);
 1788                         (cp->tlf)(sp);
 1789                         break;
 1790                 }
 1791         else
 1792                 /* TO+ event */
 1793                 switch (sp->state[cp->protoidx]) {
 1794                 case STATE_CLOSING:
 1795                 case STATE_STOPPING:
sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq,
 1797                                      0, 0);
sppp_increasing_timeout (cp, sp);
 1799                         break;
 1800                 case STATE_REQ_SENT:
 1801                 case STATE_ACK_RCVD:
 1802                         /* sppp_cp_change_state() will restart the timer */
sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1804                         (cp->scr)(sp);
 1805                         break;
 1806                 case STATE_ACK_SENT:
sppp_increasing_timeout (cp, sp);
 1808                         (cp->scr)(sp);
 1809                         break;
 1810                 }
splx(s);
 1813 }
 1815 /*
 1816  * Change the state of a control protocol in the state automaton.
 1817  * Takes care of starting/stopping the restart timer.
 1818  */
 1819 void
sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
 1821 {
STDDCL;
 1824         if (debug && sp->state[cp->protoidx] != newstate)
log(LOG_DEBUG, SPP_FMT "%s %s->%s\n",
SPP_ARGS(ifp), cp->name,
sppp_state_name(sp->state[cp->protoidx]),
sppp_state_name(newstate));
sp->state[cp->protoidx] = newstate;
 1831         switch (newstate) {
 1832         case STATE_INITIAL:
 1833         case STATE_STARTING:
 1834         case STATE_CLOSED:
 1835         case STATE_STOPPED:
 1836         case STATE_OPENED:
UNTIMEOUT(cp->TO, (void *)sp, sp->ch[cp->protoidx]);
 1838                 break;
 1839         case STATE_CLOSING:
 1840         case STATE_STOPPING:
 1841         case STATE_REQ_SENT:
 1842         case STATE_ACK_RCVD:
 1843         case STATE_ACK_SENT:
 1844                 if (!timeout_pending(&sp->ch[cp->protoidx]))
sppp_increasing_timeout (cp, sp);
 1846                 break;
 1847         }
 1848 }
 1849 /*
 1850  *--------------------------------------------------------------------------*
 1851  *                                                                          *
 1852  *                         The LCP implementation.                          *
 1853  *                                                                          *
 1854  *--------------------------------------------------------------------------*
 1855  */
HIDE void
sppp_lcp_init(struct sppp *sp)
 1858 {
sp->lcp.opts = (1 << LCP_OPT_MAGIC);
sp->lcp.magic = 0;
sp->state[IDX_LCP] = STATE_INITIAL;
sp->fail_counter[IDX_LCP] = 0;
sp->lcp.protos = 0;
sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
 1866         /*
 1867          * Initialize counters and timeout values.  Note that we don't
 1868          * use the 3 seconds suggested in RFC 1661 since we are likely
 1869          * running on a fast link.  XXX We should probably implement
 1870          * the exponential backoff option.  Note that these values are
 1871          * relevant for all control protocols, not just LCP only.
 1872          */
sp->lcp.timeout = 1 * hz;
sp->lcp.max_terminate = 2;
sp->lcp.max_configure = 10;
sp->lcp.max_failure = 10;
 1877 #if defined (__FreeBSD__)
callout_handle_init(&sp->ch[IDX_LCP]);
 1879 #endif
 1880 }
HIDE void
sppp_lcp_up(struct sppp *sp)
 1884 {
STDDCL;
 1886         struct timeval tv;
 1888         if (sp->pp_flags & PP_CISCO) {
 1889                 int s = splsoftnet();
sp->pp_if.if_link_state = LINK_STATE_UP;
if_link_state_change(&sp->pp_if);
splx(s);
 1893                 return;
 1894         }
sp->pp_alivecnt = 0;
sp->lcp.opts = (1 << LCP_OPT_MAGIC);
sp->lcp.magic = 0;
sp->lcp.protos = 0;
sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
getmicrouptime(&tv);
sp->pp_last_receive = sp->pp_last_activity = tv.tv_sec;
 1905         /*
 1906          * If this interface is passive or dial-on-demand, and we are
 1907          * still in Initial state, it means we've got an incoming
 1908          * call.  Activate the interface.
 1909          */
 1910         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
 1911                 if (debug)
log(LOG_DEBUG,
SPP_FMT "Up event", SPP_ARGS(ifp));
ifp->if_flags |= IFF_RUNNING;
 1915                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
 1916                         if (debug)
addlog("(incoming call)\n");
sp->pp_flags |= PP_CALLIN;
lcp.Open(sp);
 1920                 } else if (debug)
addlog("\n");
 1922         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
 1923                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
ifp->if_flags |= IFF_RUNNING;
lcp.Open(sp);
 1926         }
sppp_up_event(&lcp, sp);
 1929 }
HIDE void
sppp_lcp_down(struct sppp *sp)
 1933 {
STDDCL;
 1936         if (sp->pp_flags & PP_CISCO) {
 1937                 int s = splsoftnet();
sp->pp_if.if_link_state = LINK_STATE_DOWN;
if_link_state_change(&sp->pp_if);
splx(s);
 1941                 return;
 1942         }
sppp_down_event(&lcp, sp);
 1946         /*
 1947          * If this is neither a dial-on-demand nor a passive
 1948          * interface, simulate an ``ifconfig down'' action, so the
 1949          * administrator can force a redial by another ``ifconfig
 1950          * up''.  XXX For leased line operation, should we immediately
 1951          * try to reopen the connection here?
 1952          */
 1953         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
 1954                 if (debug)
log(LOG_DEBUG, SPP_FMT "Down event (carrier loss), "
 1956                             "taking interface down.", SPP_ARGS(ifp));
if_down(ifp);
 1958         } else {
 1959                 if (debug)
log(LOG_DEBUG, SPP_FMT "Down event (carrier loss)\n",
SPP_ARGS(ifp));
 1962         }
 1964         if (sp->state[IDX_LCP] != STATE_INITIAL)
lcp.Close(sp);
sp->pp_flags &= ~PP_CALLIN;
ifp->if_flags &= ~IFF_RUNNING;
sppp_flush(ifp);
 1969 }
HIDE void
sppp_lcp_open(struct sppp *sp)
 1973 {
 1974         /*
 1975          * If we are authenticator, negotiate LCP_AUTH
 1976          */
 1977         if (sp->hisauth.proto != 0)
sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
 1979         else
sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
sp->pp_flags &= ~PP_NEEDAUTH;
sppp_open_event(&lcp, sp);
 1983 }
HIDE void
sppp_lcp_close(struct sppp *sp)
 1987 {
sppp_close_event(&lcp, sp);
 1989 }
HIDE void
sppp_lcp_TO(void *cookie)
 1993 {
sppp_to_event(&lcp, (struct sppp *)cookie);
 1995 }
 1997 /*
 1998  * Analyze a configure request.  Return true if it was agreeable, and
 1999  * caused action sca, false if it has been rejected or nak'ed, and
 2000  * caused action scn.  (The return value is used to make the state
 2001  * transition decision in the state automaton.)
 2002  */
HIDE int
sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
 2005 {
STDDCL;
u_char *buf, *r, *p;
 2008         int origlen, rlen;
u_long nmagic;
u_short authproto;
len -= 4;
origlen = len;
buf = r = malloc (len, M_TEMP, M_NOWAIT);
 2015         if (! buf)
 2016                 return (0);
 2018         if (debug)
log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
SPP_ARGS(ifp));
 2022         /* pass 1: check for things that need to be rejected */
p = (void*) (h+1);
 2024         for (rlen = 0; len > 1; len -= p[1], p += p[1]) {
 2025                 if (p[1] < 2 || p[1] > len) {
free(buf, M_TEMP);
 2027                         return (-1);
 2028                 }
 2029                 if (debug)
addlog("%s ", sppp_lcp_opt_name(*p));
 2031                 switch (*p) {
 2032                 case LCP_OPT_MAGIC:
 2033                         /* Magic number. */
 2034                         /* FALLTHROUGH, both are same length */
 2035                 case LCP_OPT_ASYNC_MAP:
 2036                         /* Async control character map. */
 2037                         if (len >= 6 && p[1] == 6)
 2038                                 continue;
 2039                         if (debug)
addlog("[invalid] ");
 2041                         break;
 2042                 case LCP_OPT_MRU:
 2043                         /* Maximum receive unit. */
 2044                         if (len >= 4 && p[1] == 4)
 2045                                 continue;
 2046                         if (debug)
addlog("[invalid] ");
 2048                         break;
 2049                 case LCP_OPT_AUTH_PROTO:
 2050                         if (len < 4) {
 2051                                 if (debug)
addlog("[invalid] ");
 2053                                 break;
 2054                         }
authproto = (p[2] << 8) + p[3];
 2056                         if (authproto == PPP_CHAP && p[1] != 5) {
 2057                                 if (debug)
addlog("[invalid chap len] ");
 2059                                 break;
 2060                         }
 2061                         if (sp->myauth.proto == 0) {
 2062                                 /* we are not configured to do auth */
 2063                                 if (debug)
addlog("[not configured] ");
 2065                                 break;
 2066                         }
 2067                         /*
 2068                          * Remote want us to authenticate, remember this,
 2069                          * so we stay in PHASE_AUTHENTICATE after LCP got
 2070                          * up.
 2071                          */
sp->pp_flags |= PP_NEEDAUTH;
 2073                         continue;
 2074                 default:
 2075                         /* Others not supported. */
 2076                         if (debug)
addlog("[rej] ");
 2078                         break;
 2079                 }
 2080                 /* Add the option to rejected list. */
bcopy (p, r, p[1]);
r += p[1];
rlen += p[1];
 2084         }
 2085         if (rlen) {
 2086                 if (debug)
addlog(" send conf-rej\n");
sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
 2089                 goto end;
 2090         } else if (debug)
addlog("\n");
 2093         /*
 2094          * pass 2: check for option values that are unacceptable and
 2095          * thus require to be nak'ed.
 2096          */
 2097         if (debug)
log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
SPP_ARGS(ifp));
p = (void*) (h+1);
len = origlen;
 2103         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
 2104                 if (debug)
addlog("%s ", sppp_lcp_opt_name(*p));
 2106                 switch (*p) {
 2107                 case LCP_OPT_MAGIC:
 2108                         /* Magic number -- extract. */
nmagic = (u_long)p[2] << 24 |
 2110                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
 2111                         if (nmagic != sp->lcp.magic) {
 2112                                 if (debug)
addlog("0x%lx ", nmagic);
 2114                                 continue;
 2115                         }
 2116                         if (debug)
addlog("[glitch] ");
 2118                         ++sp->pp_loopcnt;
 2119                         /*
 2120                          * We negate our magic here, and NAK it.  If
 2121                          * we see it later in an NAK packet, we
 2122                          * suggest a new one.
 2123                          */
nmagic = ~sp->lcp.magic;
 2125                         /* Gonna NAK it. */
p[2] = nmagic >> 24;
p[3] = nmagic >> 16;
p[4] = nmagic >> 8;
p[5] = nmagic;
 2130                         break;
 2132                 case LCP_OPT_ASYNC_MAP:
 2133                         /* Async control character map -- check to be zero. */
 2134                         if (! p[2] && ! p[3] && ! p[4] && ! p[5]) {
 2135                                 if (debug)
addlog("[empty] ");
 2137                                 continue;
 2138                         }
 2139                         if (debug)
addlog("[non-empty] ");
 2141                         /* suggest a zero one */
p[2] = p[3] = p[4] = p[5] = 0;
 2143                         break;
 2145                 case LCP_OPT_MRU:
 2146                         /*
 2147                          * Maximum receive unit.  Always agreeable,
 2148                          * but ignored by now.
 2149                          */
sp->lcp.their_mru = p[2] * 256 + p[3];
 2151                         if (debug)
addlog("%lu ", sp->lcp.their_mru);
 2153                         continue;
 2155                 case LCP_OPT_AUTH_PROTO:
authproto = (p[2] << 8) + p[3];
 2157                         if (sp->myauth.proto != authproto) {
 2158                                 /* not agreed, nak */
 2159                                 if (debug)
addlog("[mine %s != his %s] ",
sppp_proto_name(sp->hisauth.proto),
sppp_proto_name(authproto));
p[2] = sp->myauth.proto >> 8;
p[3] = sp->myauth.proto;
 2165                                 break;
 2166                         }
 2167                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
 2168                                 if (debug)
addlog("[chap not MD5] ");
p[4] = CHAP_MD5;
 2171                                 break;
 2172                         }
 2173                         continue;
 2174                 }
 2175                 /* Add the option to nak'ed list. */
bcopy (p, r, p[1]);
r += p[1];
rlen += p[1];
 2179         }
 2180         if (rlen) {
 2181                 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
 2182                         if (debug)
addlog(" max_failure (%d) exceeded, "
 2184                                        "send conf-rej\n",
sp->lcp.max_failure);
sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
 2187                 } else {
 2188                         if (debug)
addlog(" send conf-nak\n");
sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
 2191                 }
 2192                 goto end;
 2193         } else {
 2194                 if (debug)
addlog("send conf-ack\n");
sp->fail_counter[IDX_LCP] = 0;
sp->pp_loopcnt = 0;
sppp_cp_send (sp, PPP_LCP, CONF_ACK,
h->ident, origlen, h+1);
 2200         }
end:
free(buf, M_TEMP);
 2204         return (rlen == 0);
 2205 }
 2207 /*
 2208  * Analyze the LCP Configure-Reject option list, and adjust our
 2209  * negotiation.
 2210  */
HIDE void
sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
 2213 {
STDDCL;
u_char *p;
len -= 4;
 2219         if (debug)
log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
SPP_ARGS(ifp));
p = (void*) (h+1);
 2224         for (; len > 1; len -= p[1], p += p[1]) {
 2225                 if (p[1] < 2 || p[1] > len)
 2226                         return;
 2227                 if (debug)
addlog("%s ", sppp_lcp_opt_name(*p));
 2229                 switch (*p) {
 2230                 case LCP_OPT_MAGIC:
 2231                         /* Magic number -- can't use it, use 0 */
sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
sp->lcp.magic = 0;
 2234                         break;
 2235                 case LCP_OPT_MRU:
 2236                         /*
 2237                          * Should not be rejected anyway, since we only
 2238                          * negotiate a MRU if explicitly requested by
 2239                          * peer.
 2240                          */
sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
 2242                         break;
 2243                 case LCP_OPT_AUTH_PROTO:
 2244                         /*
 2245                          * Peer doesn't want to authenticate himself,
 2246                          * deny unless this is a dialout call, and
 2247                          * AUTHFLAG_NOCALLOUT is set.
 2248                          */
 2249                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
 2250                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
 2251                                 if (debug)
addlog("[don't insist on auth "
 2253                                                "for callout]");
sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
 2255                                 break;
 2256                         }
 2257                         if (debug)
addlog("[access denied]\n");
lcp.Close(sp);
 2260                         break;
 2261                 }
 2262         }
 2263         if (debug)
addlog("\n");
 2265 }
 2267 /*
 2268  * Analyze the LCP Configure-NAK option list, and adjust our
 2269  * negotiation.
 2270  */
HIDE void
sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
 2273 {
STDDCL;
u_char *p;
u_long magic;
len -= 4;
 2280         if (debug)
log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
SPP_ARGS(ifp));
p = (void*) (h+1);
 2285         for (; len > 1; len -= p[1], p += p[1]) {
 2286                 if (p[1] < 2 || p[1] > len)
 2287                         return;
 2288                 if (debug)
addlog("%s ", sppp_lcp_opt_name(*p));
 2290                 switch (*p) {
 2291                 case LCP_OPT_MAGIC:
 2292                         /* Magic number -- renegotiate */
 2293                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
len >= 6 && p[1] == 6) {
magic = (u_long)p[2] << 24 |
 2296                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
 2297                                 /*
 2298                                  * If the remote magic is our negated one,
 2299                                  * this looks like a loopback problem.
 2300                                  * Suggest a new magic to make sure.
 2301                                  */
 2302                                 if (magic == ~sp->lcp.magic) {
 2303                                         if (debug)
addlog("magic glitch ");
sp->lcp.magic = arc4random();
 2306                                 } else {
sp->lcp.magic = magic;
 2308                                         if (debug)
addlog("%lu ", magic);
 2310                                 }
 2311                         }
 2312                         break;
 2313                 case LCP_OPT_MRU:
 2314                         /*
 2315                          * Peer wants to advise us to negotiate an MRU.
 2316                          * Agree on it if it's reasonable, or use
 2317                          * default otherwise.
 2318                          */
 2319                         if (len >= 4 && p[1] == 4) {
u_int mru = p[2] * 256 + p[3];
 2321                                 if (debug)
addlog("%d ", mru);
 2323                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
mru = PP_MTU;
sp->lcp.mru = mru;
sp->lcp.opts |= (1 << LCP_OPT_MRU);
 2327                         }
 2328                         break;
 2329                 case LCP_OPT_AUTH_PROTO:
 2330                         /*
 2331                          * Peer doesn't like our authentication method,
 2332                          * deny.
 2333                          */
 2334                         if (debug)
addlog("[access denied]\n");
lcp.Close(sp);
 2337                         break;
 2338                 }
 2339         }
 2340         if (debug)
addlog("\n");
 2342 }
HIDE void
sppp_lcp_tlu(struct sppp *sp)
 2346 {
 2347         struct ifnet *ifp = &sp->pp_if;
 2348         int i;
u_long mask;
 2351         /* XXX ? */
 2352         if (! (ifp->if_flags & IFF_UP) &&
 2353             (ifp->if_flags & IFF_RUNNING)) {
 2354                 /* Coming out of loopback mode. */
if_up(ifp);
 2356                 if (ifp->if_flags & IFF_DEBUG)
log(LOG_INFO, SPP_FMT "up\n", SPP_ARGS(ifp));
 2358         }
 2360         for (i = 0; i < IDX_COUNT; i++)
 2361                 if ((cps[i])->flags & CP_QUAL)
 2362                         (cps[i])->Open(sp);
 2364         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
 2365             (sp->pp_flags & PP_NEEDAUTH) != 0)
sp->pp_phase = PHASE_AUTHENTICATE;
 2367         else
sp->pp_phase = PHASE_NETWORK;
sppp_set_phase(sp);
 2372         /*
 2373          * Open all authentication protocols.  This is even required
 2374          * if we already proceeded to network phase, since it might be
 2375          * that remote wants us to authenticate, so we might have to
 2376          * send a PAP request.  Undesired authentication protocols
 2377          * don't do anything when they get an Open event.
 2378          */
 2379         for (i = 0; i < IDX_COUNT; i++)
 2380                 if ((cps[i])->flags & CP_AUTH)
 2381                         (cps[i])->Open(sp);
 2383         if (sp->pp_phase == PHASE_NETWORK) {
 2384                 /* Notify all NCPs. */
 2385                 for (i = 0; i < IDX_COUNT; i++)
 2386                         if ((cps[i])->flags & CP_NCP)
 2387                                 (cps[i])->Open(sp);
 2388         }
 2390         /* Send Up events to all started protos. */
 2391         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
 2392                 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0)
 2393                         (cps[i])->Up(sp);
 2395         /* notify low-level driver of state change */
 2396         if (sp->pp_chg)
sp->pp_chg(sp, (int)sp->pp_phase);
 2399         if (sp->pp_phase == PHASE_NETWORK)
 2400                 /* if no NCP is starting, close down */
sppp_lcp_check_and_close(sp);
 2402 }
HIDE void
sppp_lcp_tld(struct sppp *sp)
 2406 {
 2407         int i;
u_long mask;
sp->pp_phase = PHASE_TERMINATE;
sppp_set_phase(sp);
 2414         /*
 2415          * Take upper layers down.  We send the Down event first and
 2416          * the Close second to prevent the upper layers from sending
 2417          * ``a flurry of terminate-request packets'', as the RFC
 2418          * describes it.
 2419          */
 2420         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
 2421                 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) {
 2422                         (cps[i])->Down(sp);
 2423                         (cps[i])->Close(sp);
 2424                 }
 2425 }
HIDE void
sppp_lcp_tls(struct sppp *sp)
 2429 {
sp->pp_phase = PHASE_ESTABLISH;
sppp_set_phase(sp);
 2434         /* Notify lower layer if desired. */
 2435         if (sp->pp_tls)
 2436                 (sp->pp_tls)(sp);
 2437 }
HIDE void
sppp_lcp_tlf(struct sppp *sp)
 2441 {
sp->pp_phase = PHASE_DEAD;
sppp_set_phase(sp);
 2445         /* Notify lower layer if desired. */
 2446         if (sp->pp_tlf)
 2447                 (sp->pp_tlf)(sp);
 2448 }
HIDE void
sppp_lcp_scr(struct sppp *sp)
 2452 {
 2453         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
 2454         int i = 0;
u_short authproto;
 2457         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
 2458                 if (! sp->lcp.magic)
 2459 #if defined (__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
sp->lcp.magic = arc4random();
 2461 #else
sp->lcp.magic = time.tv_sec + time.tv_usec;
 2463 #endif
opt[i++] = LCP_OPT_MAGIC;
opt[i++] = 6;
opt[i++] = sp->lcp.magic >> 24;
opt[i++] = sp->lcp.magic >> 16;
opt[i++] = sp->lcp.magic >> 8;
opt[i++] = sp->lcp.magic;
 2470         }
 2472         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
opt[i++] = LCP_OPT_MRU;
opt[i++] = 4;
opt[i++] = sp->lcp.mru >> 8;
opt[i++] = sp->lcp.mru;
 2477         }
 2479         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
authproto = sp->hisauth.proto;
opt[i++] = LCP_OPT_AUTH_PROTO;
opt[i++] = authproto == PPP_CHAP? 5: 4;
opt[i++] = authproto >> 8;
opt[i++] = authproto;
 2485                 if (authproto == PPP_CHAP)
opt[i++] = CHAP_MD5;
 2487         }
sp->confid[IDX_LCP] = ++sp->pp_seq;
sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
 2491 }
 2493 /*
 2494  * Check the open NCPs, return true if at least one NCP is open.
 2495  */
HIDE int
sppp_ncp_check(struct sppp *sp)
 2498 {
 2499         int i, mask;
 2501         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
 2502                 if (sp->lcp.protos & mask && (cps[i])->flags & CP_NCP)
 2503                         return 1;
 2504         return 0;
 2505 }
 2507 /*
 2508  * Re-check the open NCPs and see if we should terminate the link.
 2509  * Called by the NCPs during their tlf action handling.
 2510  */
HIDE void
sppp_lcp_check_and_close(struct sppp *sp)
 2513 {
 2515         if (sp->pp_phase < PHASE_NETWORK)
 2516                 /* don't bother, we are already going down */
 2517                 return;
 2519         if (sppp_ncp_check(sp))
 2520                 return;
lcp.Close(sp);
 2523 }
 2524 /*
 2525  *--------------------------------------------------------------------------*
 2526  *                                                                          *
 2527  *                        The IPCP implementation.                          *
 2528  *                                                                          *
 2529  *--------------------------------------------------------------------------*
 2530  */
HIDE void
sppp_ipcp_init(struct sppp *sp)
 2534 {
sp->ipcp.opts = 0;
sp->ipcp.flags = 0;
sp->state[IDX_IPCP] = STATE_INITIAL;
sp->fail_counter[IDX_IPCP] = 0;
 2539 #if defined (__FreeBSD__)
callout_handle_init(&sp->ch[IDX_IPCP]);
 2541 #endif
 2542 }
HIDE void
sppp_ipcp_up(struct sppp *sp)
 2546 {
sppp_up_event(&ipcp, sp);
 2548 }
HIDE void
sppp_ipcp_down(struct sppp *sp)
 2552 {
sppp_down_event(&ipcp, sp);
 2554 }
HIDE void
sppp_ipcp_open(struct sppp *sp)
 2558 {
sppp_open_event(&ipcp, sp);
 2560 }
HIDE void
sppp_ipcp_close(struct sppp *sp)
 2564 {
sppp_close_event(&ipcp, sp);
 2566 }
HIDE void
sppp_ipcp_TO(void *cookie)
 2570 {
sppp_to_event(&ipcp, (struct sppp *)cookie);
 2572 }
 2574 /*
 2575  * Analyze a configure request.  Return true if it was agreeable, and
 2576  * caused action sca, false if it has been rejected or nak'ed, and
 2577  * caused action scn.  (The return value is used to make the state
 2578  * transition decision in the state automaton.)
 2579  */
HIDE int
sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
 2582 {
u_char *buf, *r, *p;
 2584         struct ifnet *ifp = &sp->pp_if;
 2585         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
u_int32_t hisaddr, desiredaddr;
len -= 4;
origlen = len;
 2590         /*
 2591          * Make sure to allocate a buf that can at least hold a
 2592          * conf-nak with an `address' option.  We might need it below.
 2593          */
buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
 2595         if (! buf)
 2596                 return (0);
 2598         /* pass 1: see if we can recognize them */
 2599         if (debug)
log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
SPP_ARGS(ifp));
p = (void*) (h+1);
 2603         for (rlen = 0; len > 1; len -= p[1], p += p[1]) {
 2604                 if (p[1] < 2 || p[1] > len) {
free(buf, M_TEMP);
 2606                         return (-1);
 2607                 }
 2608                 if (debug)
addlog("%s ", sppp_ipcp_opt_name(*p));
 2610                 switch (*p) {
 2611 #ifdef notyet
 2612                 case IPCP_OPT_COMPRESSION:
 2613                         if (len >= 6 && p[1] >= 6) {
 2614                                 /* correctly formed compress option */
 2615                                 continue;
 2616                         }
 2617                         if (debug)
addlog("[invalid] ");
 2619                         break;
 2620 #endif
 2621                 case IPCP_OPT_ADDRESS:
 2622                         if (len >= 6 && p[1] == 6) {
 2623                                 /* correctly formed address option */
 2624                                 continue;
 2625                         }
 2626                         if (debug)
addlog("[invalid] ");
 2628                         break;
 2629                 default:
 2630                         /* Others not supported. */
 2631                         if (debug)
addlog("[rej] ");
 2633                         break;
 2634                 }
 2635                 /* Add the option to rejected list. */
bcopy (p, r, p[1]);
r += p[1];
rlen += p[1];
 2639         }
 2640         if (rlen) {
 2641                 if (debug)
addlog(" send conf-rej\n");
sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
 2644                 goto end;
 2645         } else if (debug)
addlog("\n");
 2648         /* pass 2: parse option values */
 2649         if (sp->ipcp.flags & IPCP_HISADDR_SEEN)
hisaddr = sp->ipcp.req_hisaddr; /* we already agreed on that */
 2651         else
sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */
 2653         if (debug)
log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
SPP_ARGS(ifp));
p = (void*) (h+1);
len = origlen;
 2658         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
 2659                 if (debug)
addlog(" %s ", sppp_ipcp_opt_name(*p));
 2661                 switch (*p) {
 2662 #ifdef notyet
 2663                 case IPCP_OPT_COMPRESSION:
 2664                         continue;
 2665 #endif
 2666                 case IPCP_OPT_ADDRESS:
desiredaddr = p[2] << 24 | p[3] << 16 |
p[4] << 8 | p[5];
 2669                         if (desiredaddr == hisaddr ||
 2670                             ((sp->ipcp.flags & IPCP_HISADDR_DYN) &&
desiredaddr != 0)) {
 2672                                 /*
 2673                                  * Peer's address is same as our value,
 2674                                  * or we have set it to 0.0.0.1 to
 2675                                  * indicate that we do not really care,
 2676                                  * this is agreeable.  Gonna conf-ack
 2677                                  * it.
 2678                                  */
 2679                                 if (debug)
addlog("%s [ack] ",
sppp_dotted_quad(desiredaddr));
 2682                                 /* record that we've seen it already */
sp->ipcp.flags |= IPCP_HISADDR_SEEN;
sp->ipcp.req_hisaddr = desiredaddr;
hisaddr = desiredaddr;
 2686                                 continue;
 2687                         }
 2688                         /*
 2689                          * The address wasn't agreeable.  This is either
 2690                          * he sent us 0.0.0.0, asking to assign him an
 2691                          * address, or he send us another address not
 2692                          * matching our value.  Either case, we gonna
 2693                          * conf-nak it with our value.
 2694                          */
 2695                         if (debug) {
 2696                                 if (desiredaddr == 0)
addlog("[addr requested] ");
 2698                                 else
addlog("%s [not agreed] ",
sppp_dotted_quad(desiredaddr));
 2701                         }
p[2] = hisaddr >> 24;
p[3] = hisaddr >> 16;
p[4] = hisaddr >> 8;
p[5] = hisaddr;
 2707                         break;
 2708                 }
 2709                 /* Add the option to nak'ed list. */
bcopy (p, r, p[1]);
r += p[1];
rlen += p[1];
 2713         }
 2715         /*
 2716          * If we are about to conf-ack the request, but haven't seen
 2717          * his address so far, gonna conf-nak it instead, with the
 2718          * `address' option present and our idea of his address being
 2719          * filled in there, to request negotiation of both addresses.
 2720          *
 2721          * XXX This can result in an endless req - nak loop if peer
 2722          * doesn't want to send us his address.  Q: What should we do
 2723          * about it?  XXX  A: implement the max-failure counter.
 2724          */
 2725         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) {
buf[0] = IPCP_OPT_ADDRESS;
buf[1] = 6;
buf[2] = hisaddr >> 24;
buf[3] = hisaddr >> 16;
buf[4] = hisaddr >> 8;
buf[5] = hisaddr;
rlen = 6;
 2733                 if (debug)
addlog("still need hisaddr ");
 2735         }
 2737         if (rlen) {
 2738                 if (debug)
addlog(" send conf-nak\n");
sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
 2741         } else {
 2742                 if (debug)
addlog(" send conf-ack\n");
sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
h->ident, origlen, h+1);
 2746         }
end:
free(buf, M_TEMP);
 2750         return (rlen == 0);
 2751 }
 2753 /*
 2754  * Analyze the IPCP Configure-Reject option list, and adjust our
 2755  * negotiation.
 2756  */
HIDE void
sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
 2759 {
u_char *p;
 2761         struct ifnet *ifp = &sp->pp_if;
 2762         int debug = ifp->if_flags & IFF_DEBUG;
len -= 4;
 2766         if (debug)
log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
SPP_ARGS(ifp));
p = (void*) (h+1);
 2771         for (; len > 1; len -= p[1], p += p[1]) {
 2772                 if (p[1] < 2 || p[1] > len)
 2773                         return;
 2774                 if (debug)
addlog("%s ", sppp_ipcp_opt_name(*p));
 2776                 switch (*p) {
 2777                 case IPCP_OPT_ADDRESS:
 2778                         /*
 2779                          * Peer doesn't grok address option.  This is
 2780                          * bad.  XXX  Should we better give up here?
 2781                          */
sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
 2783                         break;
 2784 #ifdef notyet
 2785                 case IPCP_OPT_COMPRESS:
sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS);
 2787                         break;
 2788 #endif
 2789                 }
 2790         }
 2791         if (debug)
addlog("\n");
 2793 }
 2795 /*
 2796  * Analyze the IPCP Configure-NAK option list, and adjust our
 2797  * negotiation.
 2798  */
HIDE void
sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
 2801 {
u_char *p;
 2803         struct ifnet *ifp = &sp->pp_if;
 2804         int debug = ifp->if_flags & IFF_DEBUG;
u_int32_t wantaddr;
len -= 4;
 2809         if (debug)
log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
SPP_ARGS(ifp));
p = (void*) (h+1);
 2814         for (; len > 1; len -= p[1], p += p[1]) {
 2815                 if (p[1] < 2 || p[1] > len)
 2816                         return;
 2817                 if (debug)
addlog("%s ", sppp_ipcp_opt_name(*p));
 2819                 switch (*p) {
 2820                 case IPCP_OPT_ADDRESS:
 2821                         /*
 2822                          * Peer doesn't like our local IP address.  See
 2823                          * if we can do something for him.  We'll drop
 2824                          * him our address then.
 2825                          */
 2826                         if (len >= 6 && p[1] == 6) {
wantaddr = p[2] << 24 | p[3] << 16 |
p[4] << 8 | p[5];
sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
 2830                                 if (debug)
addlog("[wantaddr %s] ",
sppp_dotted_quad(wantaddr));
 2833                                 /*
 2834                                  * When doing dynamic address assignment,
 2835                                  * we accept his offer.  Otherwise, we
 2836                                  * ignore it and thus continue to negotiate
 2837                                  * our already existing value.
 2838                                  */
 2839                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
 2840                                         if (debug)
addlog("[agree] ");
sp->ipcp.flags |= IPCP_MYADDR_SEEN;
sp->ipcp.req_myaddr = wantaddr;
 2844                                 }
 2845                         }
 2846                         break;
 2847 #ifdef notyet
 2848                 case IPCP_OPT_COMPRESS:
 2849                         /*
 2850                          * Peer wants different compression parameters.
 2851                          */
 2852                         break;
 2853 #endif
 2854                 }
 2855         }
 2856         if (debug)
addlog("\n");
 2858 }
HIDE void
sppp_ipcp_tlu(struct sppp *sp)
 2862 {
 2863         /* we are up. Set addresses and notify anyone interested */
u_int32_t myaddr, hisaddr;
sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
 2866         if ((sp->ipcp.flags & IPCP_MYADDR_DYN) &&
 2867             (sp->ipcp.flags & IPCP_MYADDR_SEEN))
myaddr = sp->ipcp.req_myaddr;
 2869         if ((sp->ipcp.flags & IPCP_HISADDR_DYN) &&
 2870             (sp->ipcp.flags & IPCP_HISADDR_SEEN))
hisaddr = sp->ipcp.req_hisaddr;
sppp_set_ip_addrs(sp, myaddr, hisaddr);
 2873 }
HIDE void
sppp_ipcp_tld(struct sppp *sp)
 2877 {
 2878 }
HIDE void
sppp_ipcp_tls(struct sppp *sp)
 2882 {
STDDCL;
u_int32_t myaddr, hisaddr;
sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|
IPCP_MYADDR_DYN|IPCP_HISADDR_DYN);
sp->ipcp.req_myaddr = 0;
sp->ipcp.req_hisaddr = 0;
sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
 2892         /*
 2893          * If we don't have his address, this probably means our
 2894          * interface doesn't want to talk IP at all.  (This could
 2895          * be the case if somebody wants to speak only IPX, for
 2896          * example.)  Don't open IPCP in this case.
 2897          */
 2898         if (hisaddr == 0) {
 2899                 /* XXX this message should go away */
 2900                 if (debug)
log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
SPP_ARGS(ifp));
 2903                 return;
 2904         }
 2906         if (myaddr == 0) {
 2907                 /*
 2908                  * I don't have an assigned address, so i need to
 2909                  * negotiate my address.
 2910                  */
sp->ipcp.flags |= IPCP_MYADDR_DYN;
sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
 2913         }
 2914         if (hisaddr == 1) {
 2915                 /*
 2916                  * XXX - remove this hack!
 2917                  * remote has no valid address, we need to get one assigned.
 2918                  */
sp->ipcp.flags |= IPCP_HISADDR_DYN;
 2920         }
 2922         /* indicate to LCP that it must stay alive */
sp->lcp.protos |= (1 << IDX_IPCP);
 2924 }
HIDE void
sppp_ipcp_tlf(struct sppp *sp)
 2928 {
 2929         if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN))
 2930                 /* Some address was dynamic, clear it again. */
sppp_clear_ip_addrs(sp);
 2933         /* we no longer need LCP */
sp->lcp.protos &= ~(1 << IDX_IPCP);
sppp_lcp_check_and_close(sp);
 2936 }
HIDE void
sppp_ipcp_scr(struct sppp *sp)
 2940 {
 2941         char opt[6 /* compression */ + 6 /* address */];
u_int32_t ouraddr;
 2943         int i = 0;
 2945 #ifdef notyet
 2946         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
opt[i++] = IPCP_OPT_COMPRESSION;
opt[i++] = 6;
opt[i++] = 0;   /* VJ header compression */
opt[i++] = 0x2d; /* VJ header compression */
opt[i++] = max_slot_id;
opt[i++] = comp_slot_id;
 2953         }
 2954 #endif
 2956         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
 2957                 if (sp->ipcp.flags & IPCP_MYADDR_SEEN)
 2958                         /* not sure if this can ever happen */
ouraddr = sp->ipcp.req_myaddr;
 2960                 else
sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
opt[i++] = IPCP_OPT_ADDRESS;
opt[i++] = 6;
opt[i++] = ouraddr >> 24;
opt[i++] = ouraddr >> 16;
opt[i++] = ouraddr >> 8;
opt[i++] = ouraddr;
 2968         }
sp->confid[IDX_IPCP] = ++sp->pp_seq;
sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
 2972 }
 2975 /*
 2976  *--------------------------------------------------------------------------*
 2977  *                                                                          *
 2978  *                        The CHAP implementation.                          *
 2979  *                                                                          *
 2980  *--------------------------------------------------------------------------*
 2981  */
 2983 /*
 2984  * The authentication protocols don't employ a full-fledged state machine as
 2985  * the control protocols do, since they do have Open and Close events, but
 2986  * not Up and Down, nor are they explicitly terminated.  Also, use of the
 2987  * authentication protocols may be different in both directions (this makes
 2988  * sense, think of a machine that never accepts incoming calls but only
 2989  * calls out, it doesn't require the called party to authenticate itself).
 2990  *
 2991  * Our state machine for the local authentication protocol (we are requesting
 2992  * the peer to authenticate) looks like:
 2993  *
 2994  *                                                  RCA-
 2995  *            +--------------------------------------------+
 2996  *            V                                     scn,tld|
 2997  *        +--------+                           Close   +---------+ RCA+
 2998  *        |        |<----------------------------------|         |------+
 2999  *   +--->| Closed |                            TO*    | Opened  | sca  |
 3000  *   |    |        |-----+                     +-------|         |<-----+
 3001  *   |    +--------+ irc |                     |       +---------+
 3002  *   |      ^            |                     |           ^
 3003  *   |      |            |                     |           |
 3004  *   |      |            |                     |           |
 3005  *   |   TO-|            |                     |           |
 3006  *   |      |tld  TO+    V                     |           |
 3007  *   |      |   +------->+                     |           |
 3008  *   |      |   |        |                     |           |
 3009  *   |    +--------+     V                     |           |
 3010  *   |    |        |<----+<--------------------+           |
 3011  *   |    | Req-   | scr                                   |
 3012  *   |    | Sent   |                                       |
 3013  *   |    |        |                                       |
 3014  *   |    +--------+                                       |
 3015  *   | RCA- |   | RCA+                                     |
 3016  *   +------+   +------------------------------------------+
 3017  *   scn,tld      sca,irc,ict,tlu
 3018  *
 3019  *
 3020  *   with:
 3021  *
 3022  *      Open:   LCP reached authentication phase
 3023  *      Close:  LCP reached terminate phase
 3024  *
 3025  *      RCA+:   received reply (pap-req, chap-response), acceptable
 3026  *      RCN:    received reply (pap-req, chap-response), not acceptable
 3027  *      TO+:    timeout with restart counter >= 0
 3028  *      TO-:    timeout with restart counter < 0
 3029  *      TO*:    reschedule timeout for CHAP
 3030  *
 3031  *      scr:    send request packet (none for PAP, chap-challenge)
 3032  *      sca:    send ack packet (pap-ack, chap-success)
 3033  *      scn:    send nak packet (pap-nak, chap-failure)
 3034  *      ict:    initialize re-challenge timer (CHAP only)
 3035  *
 3036  *      tlu:    this-layer-up, LCP reaches network phase
 3037  *      tld:    this-layer-down, LCP enters terminate phase
 3038  *
 3039  * Note that in CHAP mode, after sending a new challenge, while the state
 3040  * automaton falls back into Req-Sent state, it doesn't signal a tld
 3041  * event to LCP, so LCP remains in network phase.  Only after not getting
 3042  * any response (or after getting an unacceptable response), CHAP closes,
 3043  * causing LCP to enter terminate phase.
 3044  *
 3045  * With PAP, there is no initial request that can be sent.  The peer is
 3046  * expected to send one based on the successful negotiation of PAP as
 3047  * the authentication protocol during the LCP option negotiation.
 3048  *
 3049  * Incoming authentication protocol requests (remote requests
 3050  * authentication, we are peer) don't employ a state machine at all,
 3051  * they are simply answered.  Some peers [Ascend P50 firmware rev
 3052  * 4.50] react allergically when sending IPCP requests while they are
 3053  * still in authentication phase (thereby violating the standard that
 3054  * demands that these NCP packets are to be discarded), so we keep
 3055  * track of the peer demanding us to authenticate, and only proceed to
 3056  * phase network once we've seen a positive acknowledge for the
 3057  * authentication.
 3058  */
 3060 /*
 3061  * Handle incoming CHAP packets.
 3062  */
 3063 void
sppp_chap_input(struct sppp *sp, struct mbuf *m)
 3065 {
STDDCL;
 3067         struct lcp_header *h;
 3068         int len, x;
u_char *value, *name, digest[AUTHKEYLEN], dsize;
 3070         int value_len, name_len;
MD5_CTX ctx;
len = m->m_pkthdr.len;
 3074         if (len < 4) {
 3075                 if (debug)
log(LOG_DEBUG,
SPP_FMT "chap invalid packet length: %d bytes\n",
SPP_ARGS(ifp), len);
 3079                 return;
 3080         }
h = mtod (m, struct lcp_header*);
 3082         if (len > ntohs (h->len))
len = ntohs (h->len);
 3085         switch (h->type) {
 3086         /* challenge, failure and success are his authproto */
 3087         case CHAP_CHALLENGE:
value = 1 + (u_char*)(h+1);
value_len = value[-1];
name = value + value_len;
name_len = len - value_len - 5;
 3092                 if (name_len < 0) {
 3093                         if (debug) {
log(LOG_DEBUG,
SPP_FMT "chap corrupted challenge "
 3096                                     "<%s id=0x%x len=%d",
SPP_ARGS(ifp),
sppp_auth_type_name(PPP_CHAP, h->type),
h->ident, ntohs(h->len));
 3100                                 if (len > 4)
sppp_print_bytes((u_char*) (h+1), len-4);
addlog(">\n");
 3103                         }
 3104                         break;
 3105                 }
 3107                 if (debug) {
log(LOG_DEBUG,
SPP_FMT "chap input <%s id=0x%x len=%d name=",
SPP_ARGS(ifp),
sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
ntohs(h->len));
sppp_print_string((char*) name, name_len);
addlog(" value-size=%d value=", value_len);
sppp_print_bytes(value, value_len);
addlog(">\n");
 3117                 }
 3119                 /* Compute reply value. */
MD5Init(&ctx);
MD5Update(&ctx, &h->ident, 1);
MD5Update(&ctx, sp->myauth.secret,
sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
MD5Update(&ctx, value, value_len);
MD5Final(digest, &ctx);
dsize = sizeof digest;
sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
 3129                                sizeof dsize, (const char *)&dsize,
 3130                                sizeof digest, digest,
 3131                                (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
sp->myauth.name,
 3133                                0);
 3134                 break;
 3136         case CHAP_SUCCESS:
 3137                 if (debug) {
log(LOG_DEBUG, SPP_FMT "chap success",
SPP_ARGS(ifp));
 3140                         if (len > 4) {
addlog(": ");
sppp_print_string((char*)(h + 1), len - 4);
 3143                         }
addlog("\n");
 3145                 }
x = splnet();
sp->pp_flags &= ~PP_NEEDAUTH;
 3148                 if (sp->myauth.proto == PPP_CHAP &&
 3149                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
 3150                     (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
 3151                         /*
 3152                          * We are authenticator for CHAP but didn't
 3153                          * complete yet.  Leave it to tlu to proceed
 3154                          * to network phase.
 3155                          */
splx(x);
 3157                         break;
 3158                 }
splx(x);
sppp_phase_network(sp);
 3161                 break;
 3163         case CHAP_FAILURE:
 3164                 if (debug) {
log(LOG_INFO, SPP_FMT "chap failure",
SPP_ARGS(ifp));
 3167                         if (len > 4) {
addlog(": ");
sppp_print_string((char*)(h + 1), len - 4);
 3170                         }
addlog("\n");
 3172                 } else
log(LOG_INFO, SPP_FMT "chap failure\n",
SPP_ARGS(ifp));
 3175                 /* await LCP shutdown by authenticator */
 3176                 break;
 3178         /* response is my authproto */
 3179         case CHAP_RESPONSE:
value = 1 + (u_char*)(h+1);
value_len = value[-1];
name = value + value_len;
name_len = len - value_len - 5;
 3184                 if (name_len < 0) {
 3185                         if (debug) {
log(LOG_DEBUG,
SPP_FMT "chap corrupted response "
 3188                                     "<%s id=0x%x len=%d",
SPP_ARGS(ifp),
sppp_auth_type_name(PPP_CHAP, h->type),
h->ident, ntohs(h->len));
 3192                                 if (len > 4)
sppp_print_bytes((u_char*)(h+1), len-4);
addlog(">\n");
 3195                         }
 3196                         break;
 3197                 }
 3198                 if (h->ident != sp->confid[IDX_CHAP]) {
 3199                         if (debug)
log(LOG_DEBUG,
SPP_FMT "chap dropping response for old ID "
 3202                                     "(got %d, expected %d)\n",
SPP_ARGS(ifp),
h->ident, sp->confid[IDX_CHAP]);
 3205                         break;
 3206                 }
 3207                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
 3208                     || bcmp(name, sp->hisauth.name, name_len) != 0) {
log(LOG_INFO, SPP_FMT "chap response, his name ",
SPP_ARGS(ifp));
sppp_print_string(name, name_len);
addlog(" != expected ");
sppp_print_string(sp->hisauth.name,
sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
addlog("\n");
 3216                 }
 3217                 if (debug) {
log(LOG_DEBUG, SPP_FMT "chap input(%s) "
 3219                             "<%s id=0x%x len=%d name=",
SPP_ARGS(ifp),
sppp_state_name(sp->state[IDX_CHAP]),
sppp_auth_type_name(PPP_CHAP, h->type),
h->ident, ntohs (h->len));
sppp_print_string((char*)name, name_len);
addlog(" value-size=%d value=", value_len);
sppp_print_bytes(value, value_len);
addlog(">\n");
 3228                 }
 3229                 if (value_len != AUTHKEYLEN) {
 3230                         if (debug)
log(LOG_DEBUG,
SPP_FMT "chap bad hash value length: "
 3233                                     "%d bytes, should be %d\n",
SPP_ARGS(ifp), value_len,
AUTHKEYLEN);
 3236                         break;
 3237                 }
MD5Init(&ctx);
MD5Update(&ctx, &h->ident, 1);
MD5Update(&ctx, sp->hisauth.secret,
sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
MD5Final(digest, &ctx);
 3246 #define FAILMSG "Failed..."
 3247 #define SUCCMSG "Welcome!"
 3249                 if (value_len != sizeof digest ||
bcmp(digest, value, value_len) != 0) {
 3251                         /* action scn, tld */
sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
 3253                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
 3254                                        0);
chap.tld(sp);
 3256                         break;
 3257                 }
 3258                 /* action sca, perhaps tlu */
 3259                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
sp->state[IDX_CHAP] == STATE_OPENED)
sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
 3262                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
 3263                                        0);
 3264                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
sppp_cp_change_state(&chap, sp, STATE_OPENED);
chap.tlu(sp);
 3267                 }
 3268                 break;
 3270         default:
 3271                 /* Unknown CHAP packet type -- ignore. */
 3272                 if (debug) {
log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
 3274                             "<0x%x id=0x%xh len=%d",
SPP_ARGS(ifp),
sppp_state_name(sp->state[IDX_CHAP]),
h->type, h->ident, ntohs(h->len));
 3278                         if (len > 4)
sppp_print_bytes((u_char*)(h+1), len-4);
addlog(">\n");
 3281                 }
 3282                 break;
 3284         }
 3285 }
HIDE void
sppp_chap_init(struct sppp *sp)
 3289 {
 3290         /* Chap doesn't have STATE_INITIAL at all. */
sp->state[IDX_CHAP] = STATE_CLOSED;
sp->fail_counter[IDX_CHAP] = 0;
 3293 #if defined (__FreeBSD__)
callout_handle_init(&sp->ch[IDX_CHAP]);
 3295 #endif
 3296 }
HIDE void
sppp_chap_open(struct sppp *sp)
 3300 {
 3301         if (sp->myauth.proto == PPP_CHAP &&
 3302             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
 3303                 /* we are authenticator for CHAP, start it */
chap.scr(sp);
sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
 3307         }
 3308         /* nothing to be done if we are peer, await a challenge */
 3309 }
HIDE void
sppp_chap_close(struct sppp *sp)
 3313 {
 3314         if (sp->state[IDX_CHAP] != STATE_CLOSED)
sppp_cp_change_state(&chap, sp, STATE_CLOSED);
 3316 }
HIDE void
sppp_chap_TO(void *cookie)
 3320 {
 3321         struct sppp *sp = (struct sppp *)cookie;
STDDCL;
 3323         int s;
s = splnet();
 3326         if (debug)
log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
SPP_ARGS(ifp),
sppp_state_name(sp->state[IDX_CHAP]),
sp->rst_counter[IDX_CHAP]);
 3332         if (--sp->rst_counter[IDX_CHAP] < 0)
 3333                 /* TO- event */
 3334                 switch (sp->state[IDX_CHAP]) {
 3335                 case STATE_REQ_SENT:
chap.tld(sp);
sppp_cp_change_state(&chap, sp, STATE_CLOSED);
 3338                         break;
 3339                 }
 3340         else
 3341                 /* TO+ (or TO*) event */
 3342                 switch (sp->state[IDX_CHAP]) {
 3343                 case STATE_OPENED:
 3344                         /* TO* event */
sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
 3346                         /* FALLTHROUGH */
 3347                 case STATE_REQ_SENT:
chap.scr(sp);
 3349                         /* sppp_cp_change_state() will restart the timer */
sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
 3351                         break;
 3352                 }
splx(s);
 3355 }
HIDE void
sppp_chap_tlu(struct sppp *sp)
 3359 {
STDDCL;
 3361         int i = 0, x;
i = 0;
sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
 3366         /*
 3367          * Some broken CHAP implementations (Conware CoNet, firmware
 3368          * 4.0.?) don't want to re-authenticate their CHAP once the
 3369          * initial challenge-response exchange has taken place.
 3370          * Provide for an option to avoid rechallenges.
 3371          */
 3372         if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
 3373                 /*
 3374                  * Compute the re-challenge timeout.  This will yield
 3375                  * a number between 300 and 810 seconds.
 3376                  */
i = 300 + (arc4random() & 0x01fe);
 3379 #if defined (__FreeBSD__)
sp->ch[IDX_CHAP] = timeout(chap.TO, (void *)sp, i * hz);
 3381 #elif defined(__OpenBSD__)
timeout_set(&sp->ch[IDX_CHAP], chap.TO, (void *)sp);
timeout_add(&sp->ch[IDX_CHAP], i * hz);
 3384 #endif
 3385         }
 3387         if (debug) {
log(LOG_DEBUG,
SPP_FMT "chap %s, ",
SPP_ARGS(ifp),
sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
 3392                 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
addlog("next re-challenge in %d seconds\n", i);
 3394                 else
addlog("re-challenging supressed\n");
 3396         }
x = splnet();
 3399         /* indicate to LCP that we need to be closed down */
sp->lcp.protos |= (1 << IDX_CHAP);
 3402         if (sp->pp_flags & PP_NEEDAUTH) {
 3403                 /*
 3404                  * Remote is authenticator, but his auth proto didn't
 3405                  * complete yet.  Defer the transition to network
 3406                  * phase.
 3407                  */
splx(x);
 3409                 return;
 3410         }
splx(x);
 3413         /*
 3414          * If we are already in phase network, we are done here.  This
 3415          * is the case if this is a dummy tlu event after a re-challenge.
 3416          */
 3417         if (sp->pp_phase != PHASE_NETWORK)
sppp_phase_network(sp);
 3419 }
HIDE void
sppp_chap_tld(struct sppp *sp)
 3423 {
STDDCL;
 3426         if (debug)
log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
UNTIMEOUT(chap.TO, (void *)sp, sp->ch[IDX_CHAP]);
sp->lcp.protos &= ~(1 << IDX_CHAP);
lcp.Close(sp);
 3432 }
HIDE void
sppp_chap_scr(struct sppp *sp)
 3436 {
u_int32_t *ch;
u_char clen;
 3440         /* Compute random challenge. */
ch = (u_int32_t *)sp->myauth.challenge;
ch[0] = arc4random();
ch[1] = arc4random();
ch[2] = arc4random();
ch[3] = arc4random();
clen = AUTHKEYLEN;
sp->confid[IDX_CHAP] = ++sp->pp_seq;
sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
 3451                        sizeof clen, (const char *)&clen,
 3452                        (size_t)AUTHKEYLEN, sp->myauth.challenge,
 3453                        (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
sp->myauth.name,
 3455                        0);
 3456 }
 3457 /*
 3458  *--------------------------------------------------------------------------*
 3459  *                                                                          *
 3460  *                        The PAP implementation.                           *
 3461  *                                                                          *
 3462  *--------------------------------------------------------------------------*
 3463  */
 3464 /*
 3465  * For PAP, we need to keep a little state also if we are the peer, not the
 3466  * authenticator.  This is since we don't get a request to authenticate, but
 3467  * have to repeatedly authenticate ourself until we got a response (or the
 3468  * retry counter is expired).
 3469  */
 3471 /*
 3472  * Handle incoming PAP packets.  */
HIDE void
sppp_pap_input(struct sppp *sp, struct mbuf *m)
 3475 {
STDDCL;
 3477         struct lcp_header *h;
 3478         int len, x;
u_char *name, *passwd, mlen;
 3480         int name_len, passwd_len;
len = m->m_pkthdr.len;
 3483         if (len < 5) {
 3484                 if (debug)
log(LOG_DEBUG,
SPP_FMT "pap invalid packet length: %d bytes\n",
SPP_ARGS(ifp), len);
 3488                 return;
 3489         }
h = mtod (m, struct lcp_header*);
 3491         if (len > ntohs (h->len))
len = ntohs (h->len);
 3493         switch (h->type) {
 3494         /* PAP request is my authproto */
 3495         case PAP_REQ:
name = 1 + (u_char*)(h+1);
name_len = name[-1];
passwd = name + name_len + 1;
 3499                 if (name_len > len - 6 ||
 3500                     (passwd_len = passwd[-1]) > len - 6 - name_len) {
 3501                         if (debug) {
log(LOG_DEBUG, SPP_FMT "pap corrupted input "
 3503                                     "<%s id=0x%x len=%d",
SPP_ARGS(ifp),
sppp_auth_type_name(PPP_PAP, h->type),
h->ident, ntohs(h->len));
 3507                                 if (len > 4)
sppp_print_bytes((u_char*)(h+1), len-4);
addlog(">\n");
 3510                         }
 3511                         break;
 3512                 }
 3513                 if (debug) {
log(LOG_DEBUG, SPP_FMT "pap input(%s) "
 3515                             "<%s id=0x%x len=%d name=",
SPP_ARGS(ifp),
sppp_state_name(sp->state[IDX_PAP]),
sppp_auth_type_name(PPP_PAP, h->type),
h->ident, ntohs(h->len));
sppp_print_string((char*)name, name_len);
addlog(" passwd=");
sppp_print_string((char*)passwd, passwd_len);
addlog(">\n");
 3524                 }
 3525                 if (name_len > AUTHNAMELEN ||
passwd_len > AUTHKEYLEN ||
bcmp(name, sp->hisauth.name, name_len) != 0 ||
bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
 3529                         /* action scn, tld */
mlen = sizeof(FAILMSG) - 1;
sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
 3532                                        sizeof mlen, (const char *)&mlen,
 3533                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
 3534                                        0);
pap.tld(sp);
 3536                         break;
 3537                 }
 3538                 /* action sca, perhaps tlu */
 3539                 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
sp->state[IDX_PAP] == STATE_OPENED) {
mlen = sizeof(SUCCMSG) - 1;
sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
 3543                                        sizeof mlen, (const char *)&mlen,
 3544                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
 3545                                        0);
 3546                 }
 3547                 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
sppp_cp_change_state(&pap, sp, STATE_OPENED);
pap.tlu(sp);
 3550                 }
 3551                 break;
 3553         /* ack and nak are his authproto */
 3554         case PAP_ACK:
UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
 3556                 if (debug) {
log(LOG_DEBUG, SPP_FMT "pap success",
SPP_ARGS(ifp));
name_len = *((char *)h);
 3560                         if (len > 5 && name_len) {
addlog(": ");
sppp_print_string((char*)(h+1), name_len);
 3563                         }
addlog("\n");
 3565                 }
x = splnet();
sp->pp_flags &= ~PP_NEEDAUTH;
 3568                 if (sp->myauth.proto == PPP_PAP &&
 3569                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
 3570                     (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
 3571                         /*
 3572                          * We are authenticator for PAP but didn't
 3573                          * complete yet.  Leave it to tlu to proceed
 3574                          * to network phase.
 3575                          */
splx(x);
 3577                         break;
 3578                 }
splx(x);
sppp_phase_network(sp);
 3581                 break;
 3583         case PAP_NAK:
UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
 3585                 if (debug) {
log(LOG_INFO, SPP_FMT "pap failure",
SPP_ARGS(ifp));
name_len = *((char *)h);
 3589                         if (len > 5 && name_len) {
addlog(": ");
sppp_print_string((char*)(h+1), name_len);
 3592                         }
addlog("\n");
 3594                 } else
log(LOG_INFO, SPP_FMT "pap failure\n",
SPP_ARGS(ifp));
 3597                 /* await LCP shutdown by authenticator */
 3598                 break;
 3600         default:
 3601                 /* Unknown PAP packet type -- ignore. */
 3602                 if (debug) {
log(LOG_DEBUG, SPP_FMT "pap corrupted input "
 3604                             "<0x%x id=0x%x len=%d",
SPP_ARGS(ifp),
h->type, h->ident, ntohs(h->len));
 3607                         if (len > 4)
sppp_print_bytes((u_char*)(h+1), len-4);
addlog(">\n");
 3610                 }
 3611                 break;
 3613         }
 3614 }
HIDE void
sppp_pap_init(struct sppp *sp)
 3618 {
 3619         /* PAP doesn't have STATE_INITIAL at all. */
sp->state[IDX_PAP] = STATE_CLOSED;
sp->fail_counter[IDX_PAP] = 0;
 3622 #if defined (__FreeBSD__)
callout_handle_init(&sp->ch[IDX_PAP]);
callout_handle_init(&sp->pap_my_to_ch);
 3625 #endif
 3626 }
HIDE void
sppp_pap_open(struct sppp *sp)
 3630 {
 3631         if (sp->hisauth.proto == PPP_PAP &&
 3632             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
 3633                 /* we are authenticator for PAP, start our timer */
sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
 3636         }
 3637         if (sp->myauth.proto == PPP_PAP) {
 3638                 /* we are peer, send a request, and start a timer */
pap.scr(sp);
 3640 #if defined (__FreeBSD__)
sp->pap_my_to_ch =
timeout(sppp_pap_my_TO, (void *)sp, sp->lcp.timeout);
 3643 #elif defined (__OpenBSD__)
timeout_set(&sp->pap_my_to_ch, sppp_pap_my_TO, (void *)sp);
timeout_add(&sp->pap_my_to_ch, sp->lcp.timeout);
 3646 #endif
 3647         }
 3648 }
HIDE void
sppp_pap_close(struct sppp *sp)
 3652 {
 3653         if (sp->state[IDX_PAP] != STATE_CLOSED)
sppp_cp_change_state(&pap, sp, STATE_CLOSED);
 3655 }
 3657 /*
 3658  * That's the timeout routine if we are authenticator.  Since the
 3659  * authenticator is basically passive in PAP, we can't do much here.
 3660  */
HIDE void
sppp_pap_TO(void *cookie)
 3663 {
 3664         struct sppp *sp = (struct sppp *)cookie;
STDDCL;
 3666         int s;
s = splnet();
 3669         if (debug)
log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
SPP_ARGS(ifp),
sppp_state_name(sp->state[IDX_PAP]),
sp->rst_counter[IDX_PAP]);
 3675         if (--sp->rst_counter[IDX_PAP] < 0)
 3676                 /* TO- event */
 3677                 switch (sp->state[IDX_PAP]) {
 3678                 case STATE_REQ_SENT:
pap.tld(sp);
sppp_cp_change_state(&pap, sp, STATE_CLOSED);
 3681                         break;
 3682                 }
 3683         else
 3684                 /* TO+ event, not very much we could do */
 3685                 switch (sp->state[IDX_PAP]) {
 3686                 case STATE_REQ_SENT:
 3687                         /* sppp_cp_change_state() will restart the timer */
sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
 3689                         break;
 3690                 }
splx(s);
 3693 }
 3695 /*
 3696  * That's the timeout handler if we are peer.  Since the peer is active,
 3697  * we need to retransmit our PAP request since it is apparently lost.
 3698  * XXX We should impose a max counter.
 3699  */
HIDE void
sppp_pap_my_TO(void *cookie)
 3702 {
 3703         struct sppp *sp = (struct sppp *)cookie;
STDDCL;
 3706         if (debug)
log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
SPP_ARGS(ifp));
pap.scr(sp);
 3711 }
HIDE void
sppp_pap_tlu(struct sppp *sp)
 3715 {
STDDCL;
 3717         int x;
sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
 3721         if (debug)
log(LOG_DEBUG, SPP_FMT "%s tlu\n",
SPP_ARGS(ifp), pap.name);
x = splnet();
 3726         /* indicate to LCP that we need to be closed down */
sp->lcp.protos |= (1 << IDX_PAP);
 3729         if (sp->pp_flags & PP_NEEDAUTH) {
 3730                 /*
 3731                  * Remote is authenticator, but his auth proto didn't
 3732                  * complete yet.  Defer the transition to network
 3733                  * phase.
 3734                  */
splx(x);
 3736                 return;
 3737         }
splx(x);
sppp_phase_network(sp);
 3740 }
HIDE void
sppp_pap_tld(struct sppp *sp)
 3744 {
STDDCL;
 3747         if (debug)
log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
UNTIMEOUT(pap.TO, (void *)sp, sp->ch[IDX_PAP]);
UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
sp->lcp.protos &= ~(1 << IDX_PAP);
lcp.Close(sp);
 3754 }
HIDE void
sppp_pap_scr(struct sppp *sp)
 3758 {
u_char idlen, pwdlen;
sp->confid[IDX_PAP] = ++sp->pp_seq;
pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
 3766                        sizeof idlen, (const char *)&idlen,
 3767                        (size_t)idlen, sp->myauth.name,
 3768                        sizeof pwdlen, (const char *)&pwdlen,
 3769                        (size_t)pwdlen, sp->myauth.secret,
 3770                        0);
 3771 }
 3772 /*
 3773  * Random miscellaneous functions.
 3774  */
 3776 /*
 3777  * Send a PAP or CHAP proto packet.
 3778  *
 3779  * Varadic function, each of the elements for the ellipsis is of type
 3780  * ``size_t mlen, const u_char *msg''.  Processing will stop iff
 3781  * mlen == 0.
 3782  */
HIDE void
sppp_auth_send(const struct cp *cp, struct sppp *sp,
 3786                 unsigned int type, u_char id, ...)
 3787 {
STDDCL;
 3789         struct ppp_header *h;
 3790         struct lcp_header *lh;
 3791         struct mbuf *m;
u_char *p;
 3793         int len;
size_t pkthdrlen;
 3795         unsigned int mlen;
 3796         const char *msg;
va_list ap;
MGETHDR (m, M_DONTWAIT, MT_DATA);
 3800         if (! m)
 3801                 return;
m->m_pkthdr.rcvif = 0;
 3804         if (sp->pp_flags & PP_NOFRAMING) {
 3805                 *mtod(m, u_int16_t *) = htons(cp->proto);
pkthdrlen = 2;
lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2);
 3808         } else {
h = mtod (m, struct ppp_header*);
h->address = PPP_ALLSTATIONS;   /* broadcast address */
h->control = PPP_UI;            /* Unnumbered Info */
h->protocol = htons(cp->proto);
pkthdrlen = PPP_HEADER_LEN;
lh = (struct lcp_header*)(h + 1);
 3815         }
lh->type = type;
lh->ident = id;
p = (u_char*) (lh+1);
va_start(ap, id);
len = 0;
 3824         while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
msg = va_arg(ap, const char *);
len += mlen;
 3827                 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) {
va_end(ap);
m_freem(m);
 3830                         return;
 3831                 }
bcopy(msg, p, mlen);
p += mlen;
 3835         }
va_end(ap);
m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len;
lh->len = htons (LCP_HEADER_LEN + len);
 3841         if (debug) {
log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
SPP_ARGS(ifp), cp->name,
sppp_auth_type_name(cp->proto, lh->type),
lh->ident, ntohs(lh->len));
 3846                 if (len)
sppp_print_bytes((u_char*) (lh+1), len);
addlog(">\n");
 3849         }
 3850         if (IF_QFULL (&sp->pp_cpq)) {
IF_DROP (&sp->pp_fastq);
IF_DROP (&ifp->if_snd);
m_freem (m);
 3854                 ++ifp->if_oerrors;
m = NULL;
 3856         } else
IF_ENQUEUE (&sp->pp_cpq, m);
 3858         if (! (ifp->if_flags & IFF_OACTIVE))
 3859                 (*ifp->if_start) (ifp);
 3860         if (m != NULL)
ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes;
 3862 }
 3864 /*
 3865  * Flush interface queue.
 3866  */
HIDE void
sppp_qflush(struct ifqueue *ifq)
 3869 {
 3870         struct mbuf *m, *n;
n = ifq->ifq_head;
 3873         while ((m = n)) {
n = m->m_act;
m_freem (m);
 3876         }
ifq->ifq_head = 0;
ifq->ifq_tail = 0;
ifq->ifq_len = 0;
 3880 }
 3882 /*
 3883  * Send keepalive packets, every 10 seconds.
 3884  */
HIDE void
sppp_keepalive(void *dummy)
 3887 {
 3888         struct sppp *sp;
 3889         int s;
 3890         struct timeval tv;
s = splnet();
getmicrouptime(&tv);
 3894         for (sp=spppq; sp; sp=sp->pp_next) {
 3895                 struct ifnet *ifp = &sp->pp_if;
 3897                 /* Keepalive mode disabled or channel down? */
 3898                 if (! (sp->pp_flags & PP_KEEPALIVE) ||
 3899                     ! (ifp->if_flags & IFF_RUNNING))
 3900                         continue;
 3902                 /* No keepalive in PPP mode if LCP not opened yet. */
 3903                 if (! (sp->pp_flags & PP_CISCO) &&
sp->pp_phase < PHASE_AUTHENTICATE)
 3905                         continue;
 3907                 /* No echo reply, but maybe user data passed through? */
 3908                 if (!(sp->pp_flags & PP_CISCO) &&
 3909                     (tv.tv_sec - sp->pp_last_receive) < NORECV_TIME) {
sp->pp_alivecnt = 0;
 3911                         continue;
 3912                 }
 3914                 if (sp->pp_alivecnt >= MAXALIVECNT) {
 3915                         /* No keepalive packets got.  Stop the interface. */
if_down (ifp);
sppp_qflush (&sp->pp_cpq);
 3918                         if (! (sp->pp_flags & PP_CISCO)) {
printf (SPP_FMT "LCP keepalive timeout\n",
SPP_ARGS(ifp));
sp->pp_alivecnt = 0;
 3923                                 /* we are down, close all open protocols */
lcp.Close(sp);
 3926                                 /* And now prepare LCP to reestablish the link, if configured to do so. */
sppp_cp_change_state(&lcp, sp, STATE_STOPPED);
 3929                                 /* Close connection imediatly, completition of this
 3930                                  * will summon the magic needed to reestablish it. */
sp->pp_tlf(sp);
 3932                                 continue;
 3933                         }
 3934                 }
 3935                 if (sp->pp_alivecnt < MAXALIVECNT)
 3936                         ++sp->pp_alivecnt;
 3937                 if (sp->pp_flags & PP_CISCO)
sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq,
sp->pp_rseq);
 3940                 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
 3941                         unsigned long nmagic = htonl (sp->lcp.magic);
sp->lcp.echoid = ++sp->pp_seq;
sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
sp->lcp.echoid, 4, &nmagic);
 3945                 }
 3946         }
splx(s);
 3948 #if defined (__FreeBSD__)
keepalive_ch = timeout(sppp_keepalive, 0, hz * 10);
 3950 #endif
 3951 #if defined (__OpenBSD__)
timeout_add(&keepalive_ch, hz * 10);
 3953 #endif
 3954 }
 3956 /*
 3957  * Get both IP addresses.
 3958  */
HIDE void
sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst,
u_int32_t *srcmask)
 3962 {
 3963         struct ifnet *ifp = &sp->pp_if;
 3964         struct ifaddr *ifa;
 3965         struct sockaddr_in *si, *sm = 0;
u_int32_t ssrc, ddst;
sm = NULL;
ssrc = ddst = 0;
 3970         /*
 3971          * Pick the first AF_INET address from the list,
 3972          * aliases don't make any sense on a p2p link anyway.
 3973          */
 3974 #if defined (__FreeBSD__)
 3975         for (ifa = ifp->if_addrhead.tqh_first, si = 0;
ifa;
ifa = ifa->ifa_link.tqe_next)
 3978 #else
si = 0;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
 3981 #endif
 3982         {
 3983                 if (ifa->ifa_addr->sa_family == AF_INET) {
si = (struct sockaddr_in *)ifa->ifa_addr;
sm = (struct sockaddr_in *)ifa->ifa_netmask;
 3986                         if (si)
 3987                                 break;
 3988                 }
 3989         }
 3990         if (ifa) {
 3991                 if (si && si->sin_addr.s_addr) {
ssrc = si->sin_addr.s_addr;
 3993                         if (srcmask)
 3994                                 *srcmask = ntohl(sm->sin_addr.s_addr);
 3995                 }
si = (struct sockaddr_in *)ifa->ifa_dstaddr;
 3998                 if (si && si->sin_addr.s_addr)
ddst = si->sin_addr.s_addr;
 4000         }
 4002         if (dst) *dst = ntohl(ddst);
 4003         if (src) *src = ntohl(ssrc);
 4004 }
 4006 /*
 4007  * If an address is 0, leave it the way it is.
 4008  */
HIDE void
sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr)
 4011 {
STDDCL;
 4013         struct ifaddr *ifa;
 4014         struct sockaddr_in *si;
 4015         struct sockaddr_in *dest;
 4017         /*
 4018          * Pick the first AF_INET address from the list,
 4019          * aliases don't make any sense on a p2p link anyway.
 4020          */
 4022 #if defined (__FreeBSD__)
 4023         for (ifa = ifp->if_addrhead.tqh_first, si = 0;
ifa;
ifa = ifa->ifa_link.tqe_next)
 4026 #else
si = 0;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
 4029 #endif
 4030         {
 4031                 if (ifa->ifa_addr->sa_family == AF_INET)
 4032                 {
si = (struct sockaddr_in *)ifa->ifa_addr;
dest = (struct sockaddr_in *)ifa->ifa_dstaddr;
 4035                         if (si)
 4036                                 break;
 4037                 }
 4038         }
 4040         if (ifa && si) {
 4041                 int error;
 4042                 struct sockaddr_in new_sin = *si;
 4043                 struct sockaddr_in new_dst = *dest;
 4045                 /*
 4046                  * Scrub old routes now instead of calling in_ifinit with
 4047                  * scrub=1, because we may change the dstaddr
 4048                  * before the call to in_ifinit.
 4049                  */
in_ifscrub(ifp, ifatoia(ifa));
 4052                 if (myaddr != 0)
new_sin.sin_addr.s_addr = htonl(myaddr);
 4054                 if (hisaddr != 0) {
new_dst.sin_addr.s_addr = htonl(hisaddr);
 4056                         if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) {
sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr;
 4058                                 *dest = new_dst; /* fix dstaddr in place */
 4059                         }
 4060                 }
 4061                 if (!(error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0)))
dohooks(ifp->if_addrhooks, 0);
 4063                 if (debug && error) {
log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addrs: in_ifinit "
 4065                         " failed, error=%d\n", SPP_ARGS(ifp), error);
 4066                 }
 4067         }
 4068 }
 4070 /*
 4071  * Clear IP addresses.  Must be called at splnet.
 4072  */
HIDE void
sppp_clear_ip_addrs(struct sppp *sp)
 4075 {
 4076         struct ifnet *ifp = &sp->pp_if;
 4077         struct ifaddr *ifa;
 4078         struct sockaddr_in *si;
 4079         struct sockaddr_in *dest;
u_int32_t remote;
 4082         if (sp->ipcp.flags & IPCP_HISADDR_DYN)
remote = sp->ipcp.saved_hisaddr;
 4084         else
sppp_get_ip_addrs(sp, 0, &remote, 0);
 4087         /*
 4088          * Pick the first AF_INET address from the list,
 4089          * aliases don't make any sense on a p2p link anyway.
 4090          */
si = 0;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 4094                 if (ifa->ifa_addr->sa_family == AF_INET) {
si = (struct sockaddr_in *)ifa->ifa_addr;
dest = (struct sockaddr_in *)ifa->ifa_dstaddr;
 4097                         if (si)
 4098                                 break;
 4099                 }
 4100         }
 4102         if (ifa && si) {
 4103                 struct sockaddr_in new_sin = *si;
in_ifscrub(ifp, ifatoia(ifa));
 4106                 if (sp->ipcp.flags & IPCP_MYADDR_DYN)
new_sin.sin_addr.s_addr = 0;
 4108                 if (sp->ipcp.flags & IPCP_HISADDR_DYN)
 4109                         /* replace peer addr in place */
dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr;
 4111                 if (!in_ifinit(ifp, ifatoia(ifa), &new_sin, 0))
dohooks(ifp->if_addrhooks, 0);
 4113         }
 4114 }
HIDE int
sppp_params(struct sppp *sp, u_long cmd, void *data)
 4118 {
 4119         struct ifreq *ifr = (struct ifreq *)data;
 4120         struct spppreq spr;
 4122         if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0)
 4123                 return EFAULT;
 4125         switch (spr.cmd) {
 4126         case (int)SPPPIOGDEFS:
 4127                 if (cmd != SIOCGIFGENERIC)
 4128                         return EINVAL;
 4129                 /*
 4130                  * We copy over the entire current state, but clean
 4131                  * out some of the stuff we don't wanna pass up.
 4132                  * Remember, SIOCGIFGENERIC is unprotected, and can be
 4133                  * called by any user.  No need to ever get PAP or
 4134                  * CHAP secrets back to userland anyway.
 4135                  */
bcopy(sp, &spr.defs, sizeof(struct sppp));
bzero(spr.defs.myauth.secret, AUTHKEYLEN);
bzero(spr.defs.myauth.challenge, AUTHKEYLEN);
bzero(spr.defs.hisauth.secret, AUTHKEYLEN);
bzero(spr.defs.hisauth.challenge, AUTHKEYLEN);
 4141                 return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr);
 4143         case (int)SPPPIOSDEFS:
 4144                 if (cmd != SIOCSIFGENERIC)
 4145                         return EINVAL;
 4146                 /*
 4147                  * We have a very specific idea of which fields we allow
 4148                  * being passed back from userland, so to not clobber our
 4149                  * current state.  For one, we only allow setting
 4150                  * anything if LCP is in dead phase.  Once the LCP
 4151                  * negotiations started, the authentication settings must
 4152                  * not be changed again.  (The administrator can force an
 4153                  * ifconfig down in order to get LCP back into dead
 4154                  * phase.)
 4155                  *
 4156                  * Also, we only allow for authentication parameters to be
 4157                  * specified.
 4158                  *
 4159                  * XXX Should allow to set or clear pp_flags.
 4160                  *
 4161                  * Finally, if the respective authentication protocol to
 4162                  * be used is set differently than 0, but the secret is
 4163                  * passed as all zeros, we don't trash the existing secret.
 4164                  * This allows an administrator to change the system name
 4165                  * only without clobbering the secret (which he didn't get
 4166                  * back in a previous SPPPIOGDEFS call).  However, the
 4167                  * secrets are cleared if the authentication protocol is
 4168                  * reset to 0.
 4169                  */
 4170                 if (sp->pp_phase != PHASE_DEAD)
 4171                         return EBUSY;
 4173                 if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP &&
spr.defs.myauth.proto != PPP_CHAP) ||
 4175                     (spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP &&
spr.defs.hisauth.proto != PPP_CHAP))
 4177                         return EINVAL;
 4179                 if (spr.defs.myauth.proto == 0)
 4180                         /* resetting myauth */
bzero(&sp->myauth, sizeof sp->myauth);
 4182                 else {
 4183                         /* setting/changing myauth */
sp->myauth.proto = spr.defs.myauth.proto;
bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
 4186                         if (spr.defs.myauth.secret[0] != '\0')
bcopy(spr.defs.myauth.secret, sp->myauth.secret,
AUTHKEYLEN);
 4189                 }
 4190                 if (spr.defs.hisauth.proto == 0)
 4191                         /* resetting hisauth */
bzero(&sp->hisauth, sizeof sp->hisauth);
 4193                 else {
 4194                         /* setting/changing hisauth */
sp->hisauth.proto = spr.defs.hisauth.proto;
sp->hisauth.flags = spr.defs.hisauth.flags;
bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
 4198                         if (spr.defs.hisauth.secret[0] != '\0')
bcopy(spr.defs.hisauth.secret, sp->hisauth.secret,
AUTHKEYLEN);
 4201                 }
 4202                 break;
 4204         default:
 4205                 return EINVAL;
 4206         }
 4208         return 0;
 4209 }
HIDE void
sppp_phase_network(struct sppp *sp)
 4213 {
 4214         int i;
u_long mask;
sp->pp_phase = PHASE_NETWORK;
sppp_set_phase(sp);
 4221         /* Notify NCPs now. */
 4222         for (i = 0; i < IDX_COUNT; i++)
 4223                 if ((cps[i])->flags & CP_NCP)
 4224                         (cps[i])->Open(sp);
 4226         /* Send Up events to all NCPs. */
 4227         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
 4228                 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_NCP))
 4229                         (cps[i])->Up(sp);
 4231         /* if no NCP is starting, all this was in vain, close down */
sppp_lcp_check_and_close(sp);
 4233 }
HIDE const char *
sppp_cp_type_name(u_char type)
 4238 {
 4239         static char buf[12];
 4240         switch (type) {
 4241         case CONF_REQ:   return "conf-req";
 4242         case CONF_ACK:   return "conf-ack";
 4243         case CONF_NAK:   return "conf-nak";
 4244         case CONF_REJ:   return "conf-rej";
 4245         case TERM_REQ:   return "term-req";
 4246         case TERM_ACK:   return "term-ack";
 4247         case CODE_REJ:   return "code-rej";
 4248         case PROTO_REJ:  return "proto-rej";
 4249         case ECHO_REQ:   return "echo-req";
 4250         case ECHO_REPLY: return "echo-reply";
 4251         case DISC_REQ:   return "discard-req";
 4252         }
snprintf (buf, sizeof buf, "0x%x", type);
 4254         return buf;
 4255 }
HIDE const char *
sppp_auth_type_name(u_short proto, u_char type)
 4259 {
 4260         static char buf[12];
 4261         switch (proto) {
 4262         case PPP_CHAP:
 4263                 switch (type) {
 4264                 case CHAP_CHALLENGE:    return "challenge";
 4265                 case CHAP_RESPONSE:     return "response";
 4266                 case CHAP_SUCCESS:      return "success";
 4267                 case CHAP_FAILURE:      return "failure";
 4268                 }
 4269         case PPP_PAP:
 4270                 switch (type) {
 4271                 case PAP_REQ:           return "req";
 4272                 case PAP_ACK:           return "ack";
 4273                 case PAP_NAK:           return "nak";
 4274                 }
 4275         }
snprintf (buf, sizeof buf, "0x%x", type);
 4277         return buf;
 4278 }
HIDE const char *
sppp_lcp_opt_name(u_char opt)
 4282 {
 4283         static char buf[12];
 4284         switch (opt) {
 4285         case LCP_OPT_MRU:               return "mru";
 4286         case LCP_OPT_ASYNC_MAP:         return "async-map";
 4287         case LCP_OPT_AUTH_PROTO:        return "auth-proto";
 4288         case LCP_OPT_QUAL_PROTO:        return "qual-proto";
 4289         case LCP_OPT_MAGIC:             return "magic";
 4290         case LCP_OPT_PROTO_COMP:        return "proto-comp";
 4291         case LCP_OPT_ADDR_COMP:         return "addr-comp";
 4292         }
snprintf (buf, sizeof buf, "0x%x", opt);
 4294         return buf;
 4295 }
HIDE const char *
sppp_ipcp_opt_name(u_char opt)
 4299 {
 4300         static char buf[12];
 4301         switch (opt) {
 4302         case IPCP_OPT_ADDRESSES:        return "addresses";
 4303         case IPCP_OPT_COMPRESSION:      return "compression";
 4304         case IPCP_OPT_ADDRESS:          return "address";
 4305         }
snprintf (buf, sizeof buf, "0x%x", opt);
 4307         return buf;
 4308 }
HIDE const char *
sppp_state_name(int state)
 4312 {
 4313         switch (state) {
 4314         case STATE_INITIAL:     return "initial";
 4315         case STATE_STARTING:    return "starting";
 4316         case STATE_CLOSED:      return "closed";
 4317         case STATE_STOPPED:     return "stopped";
 4318         case STATE_CLOSING:     return "closing";
 4319         case STATE_STOPPING:    return "stopping";
 4320         case STATE_REQ_SENT:    return "req-sent";
 4321         case STATE_ACK_RCVD:    return "ack-rcvd";
 4322         case STATE_ACK_SENT:    return "ack-sent";
 4323         case STATE_OPENED:      return "opened";
 4324         }
 4325         return "illegal";
 4326 }
HIDE const char *
sppp_phase_name(enum ppp_phase phase)
 4330 {
 4331         switch (phase) {
 4332         case PHASE_DEAD:        return "dead";
 4333         case PHASE_ESTABLISH:   return "establish";
 4334         case PHASE_TERMINATE:   return "terminate";
 4335         case PHASE_AUTHENTICATE: return "authenticate";
 4336         case PHASE_NETWORK:     return "network";
 4337         }
 4338         return "illegal";
 4339 }
HIDE const char *
sppp_proto_name(u_short proto)
 4343 {
 4344         static char buf[12];
 4345         switch (proto) {
 4346         case PPP_LCP:   return "lcp";
 4347         case PPP_IPCP:  return "ipcp";
 4348         case PPP_PAP:   return "pap";
 4349         case PPP_CHAP:  return "chap";
 4350         }
snprintf(buf, sizeof buf, "0x%x", (unsigned)proto);
 4352         return buf;
 4353 }
HIDE void
sppp_print_bytes(const u_char *p, u_short len)
 4357 {
addlog(" %02x", *p++);
 4359         while (--len > 0)
addlog("-%02x", *p++);
 4361 }
HIDE void
sppp_print_string(const char *p, u_short len)
 4365 {
u_char c;
 4368         while (len-- > 0) {
c = *p++;
 4370                 /*
 4371                  * Print only ASCII chars directly.  RFC 1994 recommends
 4372                  * using only them, but we don't rely on it.  */
 4373                 if (c < ' ' || c > '~')
addlog("\\x%x", c);
 4375                 else
addlog("%c", c);
 4377         }
 4378 }
HIDE const char *
sppp_dotted_quad(u_int32_t addr)
 4382 {
 4383         static char s[16];
snprintf(s, sizeof s, "%d.%d.%d.%d",
 4385                 (int)((addr >> 24) & 0xff),
 4386                 (int)((addr >> 16) & 0xff),
 4387                 (int)((addr >> 8) & 0xff),
 4388                 (int)(addr & 0xff));
 4389         return s;
 4390 }
HIDE int
sppp_strnlen(u_char *p, int max)
 4394 {
 4395         int len;
 4397         for (len = 0; len < max && *p; ++p)
 4398                 ++len;
 4399         return len;
 4400 }
 4402 /* a dummy, used to drop uninteresting events */
HIDE void
sppp_null(struct sppp *unused)
 4405 {
 4406         /* do just nothing */
 4407 }
 4408 /*
 4409  * This file is large.  Tell emacs to highlight it nevertheless.
 4410  *
 4411  * Local Variables:
 4412  * hilit-auto-highlight-maxout: 120000
 4413  * End:
 4414  */
HIDE void
sppp_set_phase(struct sppp *sp)
 4418 {
STDDCL;
 4420         int lstate, s;
 4422         if (debug)
log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
sppp_phase_name(sp->pp_phase));
 4426         /* set link state */
 4427         if (sp->pp_phase == PHASE_NETWORK)
lstate = LINK_STATE_UP;
 4429         else
lstate = LINK_STATE_DOWN;
 4432         if (ifp->if_link_state != lstate) {
ifp->if_link_state = lstate;
s = splsoftnet();
if_link_state_change(ifp);
splx(s);
 4437         }
 4438 }