FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_var.h
1 /* $OpenBSD: ip_var.h,v 1.108 2022/11/17 18:05:43 mvs 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 /*
39 * Structure stored in mbuf in inpcb.ip_options
40 * and passed to ip_output when ip options are in use.
41 * The actual length of the options (including ipopt_dst)
42 * is in m_len.
43 */
44 #define MAX_IPOPTLEN 40
45
46 /*
47 * Overlay for ip header used by other protocols (tcp, udp).
48 */
49 struct ipovly {
50 u_int8_t ih_x1[9]; /* (unused) */
51 u_int8_t ih_pr; /* protocol */
52 u_int16_t 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 struct ipstat {
58 u_long ips_total; /* total packets received */
59 u_long ips_badsum; /* checksum bad */
60 u_long ips_tooshort; /* packet too short */
61 u_long ips_toosmall; /* not enough data */
62 u_long ips_badhlen; /* ip header length < data size */
63 u_long ips_badlen; /* ip length < ip header length */
64 u_long ips_fragments; /* fragments received */
65 u_long ips_fragdropped; /* frags dropped (dups, out of space) */
66 u_long ips_fragtimeout; /* fragments timed out */
67 u_long ips_forward; /* packets forwarded */
68 u_long ips_cantforward; /* packets rcvd for unreachable dest */
69 u_long ips_redirectsent; /* packets forwarded on same net */
70 u_long ips_noproto; /* unknown or unsupported protocol */
71 u_long ips_delivered; /* datagrams delivered to upper level*/
72 u_long ips_localout; /* total ip packets generated here */
73 u_long ips_odropped; /* lost output due to nobufs, etc. */
74 u_long ips_reassembled; /* total packets reassembled ok */
75 u_long ips_fragmented; /* datagrams successfully fragmented */
76 u_long ips_ofragments; /* output fragments created */
77 u_long ips_cantfrag; /* don't fragment flag was set, etc. */
78 u_long ips_badoptions; /* error in option processing */
79 u_long ips_noroute; /* packets discarded due to no route */
80 u_long ips_badvers; /* ip version != 4 */
81 u_long ips_rawout; /* total raw ip packets generated */
82 u_long ips_badfrags; /* malformed fragments (bad length) */
83 u_long ips_rcvmemdrop; /* frags dropped for lack of memory */
84 u_long ips_toolong; /* ip length > max ip packet size */
85 u_long ips_nogif; /* no match gif found */
86 u_long ips_badaddr; /* invalid address on header */
87 u_long ips_inswcsum; /* software checksummed on input */
88 u_long ips_outswcsum; /* software checksummed on output */
89 u_long ips_notmember; /* multicasts for unregistered groups */
90 u_long ips_wrongif; /* packet received on wrong interface */
91 u_long ips_idropped; /* lost input due to nobufs, etc. */
92 };
93
94 struct ipoption {
95 struct in_addr ipopt_dst; /* first-hop dst if source routed */
96 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
97 };
98
99 #ifdef _KERNEL
100
101 #include <sys/percpu.h>
102
103 enum ipstat_counters {
104 ips_total, /* total packets received */
105 ips_badsum, /* checksum bad */
106 ips_tooshort, /* packet too short */
107 ips_toosmall, /* not enough data */
108 ips_badhlen, /* ip header length < data size */
109 ips_badlen, /* ip length < ip header length */
110 ips_fragments, /* fragments received */
111 ips_fragdropped, /* frags dropped (dups, out of space) */
112 ips_fragtimeout, /* fragments timed out */
113 ips_forward, /* packets forwarded */
114 ips_cantforward, /* packets rcvd for unreachable dest */
115 ips_redirectsent, /* packets forwarded on same net */
116 ips_noproto, /* unknown or unsupported protocol */
117 ips_delivered, /* datagrams delivered to upper level*/
118 ips_localout, /* total ip packets generated here */
119 ips_odropped, /* lost output packets due to nobufs, etc. */
120 ips_reassembled, /* total packets reassembled ok */
121 ips_fragmented, /* datagrams successfully fragmented */
122 ips_ofragments, /* output fragments created */
123 ips_cantfrag, /* don't fragment flag was set, etc. */
124 ips_badoptions, /* error in option processing */
125 ips_noroute, /* packets discarded due to no route */
126 ips_badvers, /* ip version != 4 */
127 ips_rawout, /* total raw ip packets generated */
128 ips_badfrags, /* malformed fragments (bad length) */
129 ips_rcvmemdrop, /* frags dropped for lack of memory */
130 ips_toolong, /* ip length > max ip packet size */
131 ips_nogif, /* no match gif found */
132 ips_badaddr, /* invalid address on header */
133 ips_inswcsum, /* software checksummed on input */
134 ips_outswcsum, /* software checksummed on output */
135 ips_notmember, /* multicasts for unregistered groups */
136 ips_wrongif, /* packet received on wrong interface */
137 ips_idropped, /* lost input packets due to nobufs, etc. */
138
139 ips_ncounters
140 };
141
142 extern struct cpumem *ipcounters;
143
144 static inline void
145 ipstat_inc(enum ipstat_counters c)
146 {
147 counters_inc(ipcounters, c);
148 }
149
150 static inline void
151 ipstat_add(enum ipstat_counters c, uint64_t v)
152 {
153 counters_add(ipcounters, c, v);
154 }
155
156 /*
157 * Structure attached to inpcb.ip_moptions and
158 * passed to ip_output when IP multicast options are in use.
159 */
160 struct ip_moptions {
161 struct in_multi **imo_membership; /* group memberships */
162 unsigned short imo_ifidx; /* ifp index for outgoing multicasts */
163 u_int8_t imo_ttl; /* TTL for outgoing multicasts */
164 u_int8_t imo_loop; /* 1 => hear sends if a member */
165 u_int16_t imo_num_memberships; /* no. memberships this socket */
166 u_int16_t imo_max_memberships; /* max memberships this socket */
167 };
168
169 #include <sys/queue.h>
170
171 /*
172 * Ip reassembly queue structures.
173 */
174 LIST_HEAD(ipqehead, ipqent);
175 struct ipqent {
176 LIST_ENTRY(ipqent) ipqe_q;
177 struct ip *ipqe_ip;
178 struct mbuf *ipqe_m; /* mbuf contains packet */
179 uint16_t ipqe_mff; /* for IP fragmentation */
180 };
181
182 /*
183 * Ip reassembly queue structure. Each fragment
184 * being reassembled is attached to one of these structures.
185 * They are timed out after ipq_ttl drops to 0, and may also
186 * be reclaimed if memory becomes tight.
187 */
188 struct ipq {
189 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */
190 u_int8_t ipq_ttl; /* time for reass q to live */
191 u_int8_t ipq_p; /* protocol of this fragment */
192 u_int16_t ipq_id; /* sequence id for reassembly */
193 struct ipqehead ipq_fragq; /* to ip fragment queue */
194 struct in_addr ipq_src, ipq_dst;
195 };
196
197 /* flags passed to ip_output */
198 #define IP_FORWARDING 0x1 /* most of ip header exists */
199 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
200 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
201 #define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */
202
203 extern struct ipstat ipstat;
204 extern int ip_defttl; /* default IP ttl */
205
206 #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
207
208 extern int ip_mtudisc; /* mtu discovery */
209 extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */
210
211 extern int ipport_firstauto; /* min port for port allocation */
212 extern int ipport_lastauto; /* max port for port allocation */
213 extern int ipport_hifirstauto; /* min dynamic/private port number */
214 extern int ipport_hilastauto; /* max dynamic/private port number */
215 extern int ipforwarding; /* enable IP forwarding */
216 #ifdef MROUTING
217 extern int ipmforwarding; /* enable multicast forwarding */
218 #endif
219 extern int ipmultipath; /* enable multipath routing */
220 extern int la_hold_total;
221
222 extern const struct pr_usrreqs rip_usrreqs;
223
224 extern struct rttimer_queue ip_mtudisc_timeout_q;
225 extern struct pool ipqent_pool;
226 struct route;
227 struct inpcb;
228
229 int ip_ctloutput(int, struct socket *, int, int, struct mbuf *);
230 int ip_fragment(struct mbuf *, struct mbuf_list *, struct ifnet *, u_long);
231 void ip_freemoptions(struct ip_moptions *);
232 int ip_getmoptions(int, struct ip_moptions *, struct mbuf *);
233 void ip_init(void);
234 struct mbuf*
235 ip_insertoptions(struct mbuf *, struct mbuf *, int *);
236 int ip_mforward(struct mbuf *, struct ifnet *);
237 int ip_optcopy(struct ip *, struct ip *);
238 int ip_output(struct mbuf *, struct mbuf *, struct route *, int,
239 struct ip_moptions *, struct inpcb *, u_int32_t);
240 u_int16_t
241 ip_randomid(void);
242 void ip_send(struct mbuf *);
243 void ip_send_raw(struct mbuf *);
244 void ip_slowtimo(void);
245 struct mbuf *
246 ip_srcroute(struct mbuf *);
247 void ip_stripoptions(struct mbuf *);
248 int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
249 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
250 struct mbuf *);
251 int ip_input_if(struct mbuf **, int *, int, int, struct ifnet *);
252 int ip_deliver(struct mbuf **, int *, int, int);
253 void ip_forward(struct mbuf *, struct ifnet *, struct rtentry *, int);
254 int rip_ctloutput(int, struct socket *, int, int, struct mbuf *);
255 void rip_init(void);
256 int rip_input(struct mbuf **, int *, int, int);
257 int rip_output(struct mbuf *, struct socket *, struct sockaddr *,
258 struct mbuf *);
259 int rip_attach(struct socket *, int, int);
260 int rip_detach(struct socket *);
261 void rip_lock(struct socket *);
262 void rip_unlock(struct socket *);
263 int rip_bind(struct socket *, struct mbuf *, struct proc *);
264 int rip_connect(struct socket *, struct mbuf *);
265 int rip_disconnect(struct socket *);
266 int rip_shutdown(struct socket *);
267 int rip_send(struct socket *, struct mbuf *, struct mbuf *,
268 struct mbuf *);
269 #ifdef MROUTING
270 extern struct socket *ip_mrouter[]; /* multicast routing daemon */
271 #endif
272
273 #endif /* _KERNEL */
274 #endif /* _NETINET_IP_VAR_H_ */
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