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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)ip_var.h 8.2 (Berkeley) 1/9/95
30 * $FreeBSD: releng/5.3/sys/netinet/ip_var.h 136588 2004-10-16 08:43:07Z cvs2svn $
31 */
32
33 #ifndef _NETINET_IP_VAR_H_
34 #define _NETINET_IP_VAR_H_
35
36 #include <sys/queue.h>
37
38 /*
39 * Overlay for ip header used by other protocols (tcp, udp).
40 */
41 struct ipovly {
42 u_char ih_x1[9]; /* (unused) */
43 u_char ih_pr; /* protocol */
44 u_short ih_len; /* protocol length */
45 struct in_addr ih_src; /* source internet address */
46 struct in_addr ih_dst; /* destination internet address */
47 };
48
49 #ifdef _KERNEL
50 /*
51 * Ip reassembly queue structure. Each fragment
52 * being reassembled is attached to one of these structures.
53 * They are timed out after ipq_ttl drops to 0, and may also
54 * be reclaimed if memory becomes tight.
55 */
56 struct ipq {
57 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */
58 u_char ipq_ttl; /* time for reass q to live */
59 u_char ipq_p; /* protocol of this fragment */
60 u_short ipq_id; /* sequence id for reassembly */
61 struct mbuf *ipq_frags; /* to ip headers of fragments */
62 struct in_addr ipq_src,ipq_dst;
63 u_char ipq_nfrags; /* # frags in this packet */
64 struct label *ipq_label; /* MAC label */
65 };
66 #endif /* _KERNEL */
67
68 /*
69 * Structure stored in mbuf in inpcb.ip_options
70 * and passed to ip_output when ip options are in use.
71 * The actual length of the options (including ipopt_dst)
72 * is in m_len.
73 */
74 #define MAX_IPOPTLEN 40
75
76 struct ipoption {
77 struct in_addr ipopt_dst; /* first-hop dst if source routed */
78 char ipopt_list[MAX_IPOPTLEN]; /* options proper */
79 };
80
81 /*
82 * Structure attached to inpcb.ip_moptions and
83 * passed to ip_output when IP multicast options are in use.
84 */
85 struct ip_moptions {
86 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
87 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
88 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */
89 u_char imo_multicast_loop; /* 1 => hear sends if a member */
90 u_short imo_num_memberships; /* no. memberships this socket */
91 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
92 u_long imo_multicast_vif; /* vif num outgoing multicasts */
93 };
94
95 struct ipstat {
96 u_long ips_total; /* total packets received */
97 u_long ips_badsum; /* checksum bad */
98 u_long ips_tooshort; /* packet too short */
99 u_long ips_toosmall; /* not enough data */
100 u_long ips_badhlen; /* ip header length < data size */
101 u_long ips_badlen; /* ip length < ip header length */
102 u_long ips_fragments; /* fragments received */
103 u_long ips_fragdropped; /* frags dropped (dups, out of space) */
104 u_long ips_fragtimeout; /* fragments timed out */
105 u_long ips_forward; /* packets forwarded */
106 u_long ips_fastforward; /* packets fast forwarded */
107 u_long ips_cantforward; /* packets rcvd for unreachable dest */
108 u_long ips_redirectsent; /* packets forwarded on same net */
109 u_long ips_noproto; /* unknown or unsupported protocol */
110 u_long ips_delivered; /* datagrams delivered to upper level*/
111 u_long ips_localout; /* total ip packets generated here */
112 u_long ips_odropped; /* lost packets due to nobufs, etc. */
113 u_long ips_reassembled; /* total packets reassembled ok */
114 u_long ips_fragmented; /* datagrams successfully fragmented */
115 u_long ips_ofragments; /* output fragments created */
116 u_long ips_cantfrag; /* don't fragment flag was set, etc. */
117 u_long ips_badoptions; /* error in option processing */
118 u_long ips_noroute; /* packets discarded due to no route */
119 u_long ips_badvers; /* ip version != 4 */
120 u_long ips_rawout; /* total raw ip packets generated */
121 u_long ips_toolong; /* ip length > max ip packet size */
122 u_long ips_notmember; /* multicasts for unregistered grps */
123 u_long ips_nogif; /* no match gif found */
124 u_long ips_badaddr; /* invalid address on header */
125 };
126
127 #ifdef _KERNEL
128
129 /* flags passed to ip_output as last parameter */
130 #define IP_FORWARDING 0x1 /* most of ip header exists */
131 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
132 #define IP_SENDONES 0x4 /* send all-ones broadcast */
133 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
134 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
135
136 /* mbuf flag used by ip_fastfwd */
137 #define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */
138
139 struct ip;
140 struct inpcb;
141 struct route;
142 struct sockopt;
143
144 extern struct ipstat ipstat;
145 extern u_short ip_id; /* ip packet ctr, for ids */
146 extern int ip_defttl; /* default IP ttl */
147 extern int ipforwarding; /* ip forwarding */
148 extern int ip_doopts; /* process or ignore IP options */
149 #ifdef IPSTEALTH
150 extern int ipstealth; /* stealth forwarding */
151 #endif
152 extern u_char ip_protox[];
153 extern struct socket *ip_rsvpd; /* reservation protocol daemon */
154 extern struct socket *ip_mrouter; /* multicast routing daemon */
155 extern int (*legal_vif_num)(int);
156 extern u_long (*ip_mcast_src)(int);
157 extern int rsvp_on;
158 extern struct pr_usrreqs rip_usrreqs;
159
160 int ip_ctloutput(struct socket *, struct sockopt *sopt);
161 void ip_drain(void);
162 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
163 u_long if_hwassist_flags, int sw_csum);
164 void ip_freemoptions(struct ip_moptions *);
165 void ip_init(void);
166 extern int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
167 struct ip_moptions *);
168 int ip_output(struct mbuf *,
169 struct mbuf *, struct route *, int, struct ip_moptions *,
170 struct inpcb *);
171 struct mbuf *
172 ip_reass(struct mbuf *);
173 struct in_ifaddr *
174 ip_rtaddr(struct in_addr);
175 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
176 struct mbuf *);
177 void ip_slowtimo(void);
178 struct mbuf *
179 ip_srcroute(struct mbuf *);
180 void ip_stripoptions(struct mbuf *, struct mbuf *);
181 u_int16_t ip_randomid(void);
182 int rip_ctloutput(struct socket *, struct sockopt *);
183 void rip_ctlinput(int, struct sockaddr *, void *);
184 void rip_init(void);
185 void rip_input(struct mbuf *, int);
186 int rip_output(struct mbuf *, struct socket *, u_long);
187 void ipip_input(struct mbuf *, int);
188 void rsvp_input(struct mbuf *, int);
189 int ip_rsvp_init(struct socket *);
190 int ip_rsvp_done(void);
191 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
192 extern void (*ip_rsvp_force_done)(struct socket *);
193 extern void (*rsvp_input_p)(struct mbuf *m, int off);
194
195 extern struct pfil_head inet_pfil_hook; /* packet filter hooks */
196
197 void in_delayed_cksum(struct mbuf *m);
198
199 static __inline uint16_t ip_newid(void);
200 extern int ip_do_randomid;
201
202 static __inline uint16_t
203 ip_newid(void)
204 {
205 if (ip_do_randomid)
206 return ip_randomid();
207
208 return htons(ip_id++);
209 }
210
211 #endif /* _KERNEL */
212
213 #endif /* !_NETINET_IP_VAR_H_ */
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