1 /* $OpenBSD: ip_var.h,v 1.36 2006/05/29 20:42:27 claudio Exp $ */
2 /* $NetBSD: ip_var.h,v 1.16 1996/02/13 23:43:20 christos Exp $ */
3
4 /*
5 * Copyright (c) 1982, 1986, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY 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 REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)ip_var.h 8.1 (Berkeley) 6/10/93
33 */
34
35 #ifndef _NETINET_IP_VAR_H_
36 #define _NETINET_IP_VAR_H_
37
38 #include <sys/queue.h>
39
40 /*
41 * Overlay for ip header used by other protocols (tcp, udp).
42 */
43 struct ipovly {
44 u_int8_t ih_x1[9]; /* (unused) */
45 u_int8_t ih_pr; /* protocol */
46 u_int16_t ih_len; /* protocol length */
47 struct in_addr ih_src; /* source internet address */
48 struct in_addr ih_dst; /* destination internet address */
49 };
50
51 /*
52 * Ip reassembly queue structures.
53 */
54 LIST_HEAD(ipqehead, ipqent);
55 struct ipqent {
56 LIST_ENTRY(ipqent) ipqe_q;
57 struct ip *ipqe_ip;
58 struct mbuf *ipqe_m; /* mbuf contains packet */
59 u_int8_t ipqe_mff; /* for IP fragmentation */
60 };
61
62 /*
63 * Ip reassembly queue structure. Each fragment
64 * being reassembled is attached to one of these structures.
65 * They are timed out after ipq_ttl drops to 0, and may also
66 * be reclaimed if memory becomes tight.
67 */
68 struct ipq {
69 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */
70 u_int8_t ipq_ttl; /* time for reass q to live */
71 u_int8_t ipq_p; /* protocol of this fragment */
72 u_int16_t ipq_id; /* sequence id for reassembly */
73 struct ipqehead ipq_fragq; /* to ip fragment queue */
74 struct in_addr ipq_src, ipq_dst;
75 };
76
77 /*
78 * Structure stored in mbuf in inpcb.ip_options
79 * and passed to ip_output when ip options are in use.
80 * The actual length of the options (including ipopt_dst)
81 * is in m_len.
82 */
83 #define MAX_IPOPTLEN 40
84
85 struct ipoption {
86 struct in_addr ipopt_dst; /* first-hop dst if source routed */
87 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
88 };
89
90 /*
91 * Structure attached to inpcb.ip_moptions and
92 * passed to ip_output when IP multicast options are in use.
93 */
94 struct ip_moptions {
95 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
96 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */
97 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */
98 u_int16_t imo_num_memberships; /* no. memberships this socket */
99 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
100 };
101
102 struct ipstat {
103 u_long ips_total; /* total packets received */
104 u_long ips_badsum; /* checksum bad */
105 u_long ips_tooshort; /* packet too short */
106 u_long ips_toosmall; /* not enough data */
107 u_long ips_badhlen; /* ip header length < data size */
108 u_long ips_badlen; /* ip length < ip header length */
109 u_long ips_fragments; /* fragments received */
110 u_long ips_fragdropped; /* frags dropped (dups, out of space) */
111 u_long ips_fragtimeout; /* fragments timed out */
112 u_long ips_forward; /* packets forwarded */
113 u_long ips_cantforward; /* packets rcvd for unreachable dest */
114 u_long ips_redirectsent; /* packets forwarded on same net */
115 u_long ips_noproto; /* unknown or unsupported protocol */
116 u_long ips_delivered; /* datagrams delivered to upper level*/
117 u_long ips_localout; /* total ip packets generated here */
118 u_long ips_odropped; /* lost packets due to nobufs, etc. */
119 u_long ips_reassembled; /* total packets reassembled ok */
120 u_long ips_fragmented; /* datagrams successfully fragmented */
121 u_long ips_ofragments; /* output fragments created */
122 u_long ips_cantfrag; /* don't fragment flag was set, etc. */
123 u_long ips_badoptions; /* error in option processing */
124 u_long ips_noroute; /* packets discarded due to no route */
125 u_long ips_badvers; /* ip version != 4 */
126 u_long ips_rawout; /* total raw ip packets generated */
127 u_long ips_badfrags; /* malformed fragments (bad length) */
128 u_long ips_rcvmemdrop; /* frags dropped for lack of memory */
129 u_long ips_toolong; /* ip length > max ip packet size */
130 u_long ips_nogif; /* no match gif found */
131 u_long ips_badaddr; /* invalid address on header */
132 u_long ips_inhwcsum; /* hardware checksummed on input */
133 u_long ips_outhwcsum; /* hardware checksummed on output */
134 u_long ips_notmember; /* multicasts for unregistered groups */
135 };
136
137 #ifdef _KERNEL
138 /* flags passed to ip_output as last parameter */
139 #define IP_FORWARDING 0x1 /* most of ip header exists */
140 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
141 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
142 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
143 #define IP_JUMBO SO_JUMBO /* try to use the jumbo mtu */
144 #define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */
145 #define IP_ROUTETOETHER 0x1000 /* ether addresses given */
146
147 extern struct ipstat ipstat;
148 extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */
149 extern int ip_defttl; /* default IP ttl */
150
151 extern int ip_mtudisc; /* mtu discovery */
152 extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */
153 extern struct rttimer_queue *ip_mtudisc_timeout_q;
154 extern struct pool ipqent_pool;
155 struct inpcb;
156
157 int ip_ctloutput(int, struct socket *, int, int, struct mbuf **);
158 int ip_dooptions(struct mbuf *);
159 void ip_drain(void);
160 void ip_flush(void);
161 void ip_forward(struct mbuf *, int);
162 int ip_fragment(struct mbuf *, struct ifnet *, u_long);
163 void ip_freef(struct ipq *);
164 void ip_freemoptions(struct ip_moptions *);
165 int ip_getmoptions(int, struct ip_moptions *, struct mbuf **);
166 void ip_init(void);
167 int ip_mforward(struct mbuf *, struct ifnet *);
168 int ip_optcopy(struct ip *, struct ip *);
169 int ip_output(struct mbuf *, ...);
170 int ip_pcbopts(struct mbuf **, struct mbuf *);
171 struct mbuf *
172 ip_reass(struct ipqent *, struct ipq *);
173 struct in_ifaddr *
174 in_iawithaddr(struct in_addr, struct mbuf *);
175 struct in_ifaddr *
176 ip_rtaddr(struct in_addr);
177 u_int16_t
178 ip_randomid(void);
179 int ip_setmoptions(int, struct ip_moptions **, struct mbuf *);
180 void ip_slowtimo(void);
181 struct mbuf *
182 ip_srcroute(void);
183 void ip_stripoptions(struct mbuf *, struct mbuf *);
184 int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
185 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
186 struct mbuf *);
187 void ipintr(void);
188 void ipv4_input(struct mbuf *);
189 int rip_ctloutput(int, struct socket *, int, int, struct mbuf **);
190 void rip_init(void);
191 void rip_input(struct mbuf *, ...);
192 int rip_output(struct mbuf *, ...);
193 int rip_usrreq(struct socket *,
194 int, struct mbuf *, struct mbuf *, struct mbuf *);
195 #endif /* _KERNEL */
196 #endif /* _NETINET_IP_VAR_H_ */