FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_var.h
1 /*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)ip_var.h 8.2 (Berkeley) 1/9/95
34 * $FreeBSD: releng/5.1/sys/netinet/ip_var.h 112985 2003-04-02 20:14:44Z mdodd $
35 */
36
37 #ifndef _NETINET_IP_VAR_H_
38 #define _NETINET_IP_VAR_H_
39
40 #include <sys/queue.h>
41
42 #ifdef _KERNEL
43 #include <sys/_label.h>
44 #endif
45
46 /*
47 * Overlay for ip header used by other protocols (tcp, udp).
48 */
49 struct ipovly {
50 u_char ih_x1[9]; /* (unused) */
51 u_char ih_pr; /* protocol */
52 u_short ih_len; /* protocol length */
53 struct in_addr ih_src; /* source internet address */
54 struct in_addr ih_dst; /* destination internet address */
55 };
56
57 #ifdef _KERNEL
58 /*
59 * Ip reassembly queue structure. Each fragment
60 * being reassembled is attached to one of these structures.
61 * They are timed out after ipq_ttl drops to 0, and may also
62 * be reclaimed if memory becomes tight.
63 */
64 struct ipq {
65 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */
66 u_char ipq_ttl; /* time for reass q to live */
67 u_char ipq_p; /* protocol of this fragment */
68 u_short ipq_id; /* sequence id for reassembly */
69 struct mbuf *ipq_frags; /* to ip headers of fragments */
70 struct in_addr ipq_src,ipq_dst;
71 u_char ipq_nfrags; /* # frags in this packet */
72 u_int32_t ipq_div_info; /* ipfw divert port & flags */
73 u_int16_t ipq_div_cookie; /* ipfw divert cookie */
74 struct label ipq_label; /* MAC label */
75 };
76 #endif /* _KERNEL */
77
78 /*
79 * Structure stored in mbuf in inpcb.ip_options
80 * and passed to ip_output when ip options are in use.
81 * The actual length of the options (including ipopt_dst)
82 * is in m_len.
83 */
84 #define MAX_IPOPTLEN 40
85
86 struct ipoption {
87 struct in_addr ipopt_dst; /* first-hop dst if source routed */
88 char ipopt_list[MAX_IPOPTLEN]; /* options proper */
89 };
90
91 /*
92 * Structure attached to inpcb.ip_moptions and
93 * passed to ip_output when IP multicast options are in use.
94 */
95 struct ip_moptions {
96 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
97 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
98 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */
99 u_char imo_multicast_loop; /* 1 => hear sends if a member */
100 u_short imo_num_memberships; /* no. memberships this socket */
101 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
102 u_long imo_multicast_vif; /* vif num outgoing multicasts */
103 };
104
105 struct ipstat {
106 u_long ips_total; /* total packets received */
107 u_long ips_badsum; /* checksum bad */
108 u_long ips_tooshort; /* packet too short */
109 u_long ips_toosmall; /* not enough data */
110 u_long ips_badhlen; /* ip header length < data size */
111 u_long ips_badlen; /* ip length < ip header length */
112 u_long ips_fragments; /* fragments received */
113 u_long ips_fragdropped; /* frags dropped (dups, out of space) */
114 u_long ips_fragtimeout; /* fragments timed out */
115 u_long ips_forward; /* packets forwarded */
116 u_long ips_fastforward; /* packets fast forwarded */
117 u_long ips_cantforward; /* packets rcvd for unreachable dest */
118 u_long ips_redirectsent; /* packets forwarded on same net */
119 u_long ips_noproto; /* unknown or unsupported protocol */
120 u_long ips_delivered; /* datagrams delivered to upper level*/
121 u_long ips_localout; /* total ip packets generated here */
122 u_long ips_odropped; /* lost packets due to nobufs, etc. */
123 u_long ips_reassembled; /* total packets reassembled ok */
124 u_long ips_fragmented; /* datagrams successfully fragmented */
125 u_long ips_ofragments; /* output fragments created */
126 u_long ips_cantfrag; /* don't fragment flag was set, etc. */
127 u_long ips_badoptions; /* error in option processing */
128 u_long ips_noroute; /* packets discarded due to no route */
129 u_long ips_badvers; /* ip version != 4 */
130 u_long ips_rawout; /* total raw ip packets generated */
131 u_long ips_toolong; /* ip length > max ip packet size */
132 u_long ips_notmember; /* multicasts for unregistered grps */
133 u_long ips_nogif; /* no match gif found */
134 u_long ips_badaddr; /* invalid address on header */
135 };
136
137 #ifdef _KERNEL
138
139 /* flags passed to ip_output as last parameter */
140 #define IP_FORWARDING 0x1 /* most of ip header exists */
141 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
142 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
143 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
144
145 struct ip;
146 struct inpcb;
147 struct route;
148 struct sockopt;
149
150 extern struct ipstat ipstat;
151 #ifndef RANDOM_IP_ID
152 extern u_short ip_id; /* ip packet ctr, for ids */
153 #endif
154 extern int ip_defttl; /* default IP ttl */
155 extern int ipforwarding; /* ip forwarding */
156 extern struct route ipforward_rt; /* ip forwarding cached route */
157 extern u_char ip_protox[];
158 extern struct socket *ip_rsvpd; /* reservation protocol daemon */
159 extern struct socket *ip_mrouter; /* multicast routing daemon */
160 extern int (*legal_vif_num)(int);
161 extern u_long (*ip_mcast_src)(int);
162 extern int rsvp_on;
163 extern struct pr_usrreqs rip_usrreqs;
164
165 int ip_ctloutput(struct socket *, struct sockopt *sopt);
166 void ip_drain(void);
167 void ip_freemoptions(struct ip_moptions *);
168 void ip_init(void);
169 extern int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
170 struct ip_moptions *);
171 int ip_output(struct mbuf *,
172 struct mbuf *, struct route *, int, struct ip_moptions *,
173 struct inpcb *);
174 struct in_ifaddr *
175 ip_rtaddr(struct in_addr, struct route *);
176 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
177 struct mbuf *);
178 void ip_slowtimo(void);
179 struct mbuf *
180 ip_srcroute(void);
181 void ip_stripoptions(struct mbuf *, struct mbuf *);
182 #ifdef RANDOM_IP_ID
183 u_int16_t
184 ip_randomid(void);
185 #endif
186 int rip_ctloutput(struct socket *, struct sockopt *);
187 void rip_ctlinput(int, struct sockaddr *, void *);
188 void rip_init(void);
189 void rip_input(struct mbuf *, int);
190 int rip_output(struct mbuf *, struct socket *, u_long);
191 void ipip_input(struct mbuf *, int);
192 void rsvp_input(struct mbuf *, int);
193 int ip_rsvp_init(struct socket *);
194 int ip_rsvp_done(void);
195 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
196 extern void (*ip_rsvp_force_done)(struct socket *);
197 extern void (*rsvp_input_p)(struct mbuf *m, int off);
198
199
200 #ifdef IPDIVERT
201 void div_init(void);
202 void div_input(struct mbuf *, int);
203 void divert_packet(struct mbuf *m, int incoming, int port, int rule);
204 extern struct pr_usrreqs div_usrreqs;
205 #endif
206
207 void in_delayed_cksum(struct mbuf *m);
208
209 #endif /* _KERNEL */
210
211 #endif /* !_NETINET_IP_VAR_H_ */
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