1 /* $OpenBSD: ip_var.h,v 1.118 2024/06/07 18:24:16 bluhm 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_rtcachehit; /* valid route found in cache */
91 u_long ips_rtcachemiss; /* route cache with new destination */
92 u_long ips_wrongif; /* packet received on wrong interface */
93 u_long ips_idropped; /* lost input due to nobufs, etc. */
94 };
95
96 struct ipoption {
97 struct in_addr ipopt_dst; /* first-hop dst if source routed */
98 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
99 };
100
101 #ifdef _KERNEL
102
103 #include <sys/percpu.h>
104
105 enum ipstat_counters {
106 ips_total, /* total packets received */
107 ips_badsum, /* checksum bad */
108 ips_tooshort, /* packet too short */
109 ips_toosmall, /* not enough data */
110 ips_badhlen, /* ip header length < data size */
111 ips_badlen, /* ip length < ip header length */
112 ips_fragments, /* fragments received */
113 ips_fragdropped, /* frags dropped (dups, out of space) */
114 ips_fragtimeout, /* fragments timed out */
115 ips_forward, /* packets forwarded */
116 ips_cantforward, /* packets rcvd for unreachable dest */
117 ips_redirectsent, /* packets forwarded on same net */
118 ips_noproto, /* unknown or unsupported protocol */
119 ips_delivered, /* datagrams delivered to upper level*/
120 ips_localout, /* total ip packets generated here */
121 ips_odropped, /* lost output packets due to nobufs, etc. */
122 ips_reassembled, /* total packets reassembled ok */
123 ips_fragmented, /* datagrams successfully fragmented */
124 ips_ofragments, /* output fragments created */
125 ips_cantfrag, /* don't fragment flag was set, etc. */
126 ips_badoptions, /* error in option processing */
127 ips_noroute, /* packets discarded due to no route */
128 ips_badvers, /* ip version != 4 */
129 ips_rawout, /* total raw ip packets generated */
130 ips_badfrags, /* malformed fragments (bad length) */
131 ips_rcvmemdrop, /* frags dropped for lack of memory */
132 ips_toolong, /* ip length > max ip packet size */
133 ips_nogif, /* no match gif found */
134 ips_badaddr, /* invalid address on header */
135 ips_inswcsum, /* software checksummed on input */
136 ips_outswcsum, /* software checksummed on output */
137 ips_notmember, /* multicasts for unregistered groups */
138 ips_rtcachehit, /* valid route to destination found in cache */
139 ips_rtcachemiss, /* route cache filled with new destination */
140 ips_wrongif, /* packet received on wrong interface */
141 ips_idropped, /* lost input packets due to nobufs, etc. */
142
143 ips_ncounters
144 };
145
146 extern struct cpumem *ipcounters;
147
148 static inline void
ipstat_inc(enum ipstat_counters c)149 ipstat_inc(enum ipstat_counters c)
150 {
151 counters_inc(ipcounters, c);
152 }
153
154 static inline void
ipstat_add(enum ipstat_counters c,uint64_t v)155 ipstat_add(enum ipstat_counters c, uint64_t v)
156 {
157 counters_add(ipcounters, c, v);
158 }
159
160 /*
161 * Structure attached to inpcb.ip_moptions and
162 * passed to ip_output when IP multicast options are in use.
163 */
164 struct ip_moptions {
165 struct in_multi **imo_membership; /* group memberships */
166 unsigned short imo_ifidx; /* ifp index for outgoing multicasts */
167 u_int8_t imo_ttl; /* TTL for outgoing multicasts */
168 u_int8_t imo_loop; /* 1 => hear sends if a member */
169 u_int16_t imo_num_memberships; /* no. memberships this socket */
170 u_int16_t imo_max_memberships; /* max memberships this socket */
171 };
172
173 #include <sys/queue.h>
174
175 /*
176 * Ip reassembly queue structures.
177 */
178 LIST_HEAD(ipqehead, ipqent);
179 struct ipqent {
180 LIST_ENTRY(ipqent) ipqe_q;
181 struct ip *ipqe_ip;
182 struct mbuf *ipqe_m; /* mbuf contains packet */
183 uint16_t ipqe_mff; /* for IP fragmentation */
184 };
185
186 /*
187 * Ip reassembly queue structure. Each fragment
188 * being reassembled is attached to one of these structures.
189 * They are timed out after ipq_ttl drops to 0, and may also
190 * be reclaimed if memory becomes tight.
191 */
192 struct ipq {
193 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */
194 u_int8_t ipq_ttl; /* time for reass q to live */
195 u_int8_t ipq_p; /* protocol of this fragment */
196 u_int16_t ipq_id; /* sequence id for reassembly */
197 struct ipqehead ipq_fragq; /* to ip fragment queue */
198 struct in_addr ipq_src, ipq_dst;
199 };
200
201 struct ipoffnxt {
202 int ion_off;
203 int ion_nxt;
204 };
205
206 /* flags passed to ip_output */
207 #define IP_FORWARDING 0x0001 /* most of ip header exists */
208 #define IP_RAWOUTPUT 0x0002 /* raw ip header exists */
209 #define IP_REDIRECT 0x0004 /* redirected by pf or source route */
210 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
211 #define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */
212
213 extern struct ipstat ipstat;
214 extern int ip_defttl; /* default IP ttl */
215
216 #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
217
218 extern int ip_mtudisc; /* mtu discovery */
219 extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */
220
221 extern int ipport_firstauto; /* min port for port allocation */
222 extern int ipport_lastauto; /* max port for port allocation */
223 extern int ipport_hifirstauto; /* min dynamic/private port number */
224 extern int ipport_hilastauto; /* max dynamic/private port number */
225 extern int ip_forwarding; /* enable IP forwarding */
226 #ifdef MROUTING
227 extern int ipmforwarding; /* enable multicast forwarding */
228 #endif
229 extern int ipmultipath; /* enable multipath routing */
230 extern int ip_directedbcast; /* accept all broadcast packets */
231 extern unsigned int la_hold_total;
232
233 extern const struct pr_usrreqs rip_usrreqs;
234
235 extern struct rttimer_queue ip_mtudisc_timeout_q;
236 extern struct pool ipqent_pool;
237 struct rtentry;
238 struct route;
239 struct inpcb;
240 struct ipsec_level;
241
242 int ip_ctloutput(int, struct socket *, int, int, struct mbuf *);
243 int ip_fragment(struct mbuf *, struct mbuf_list *, struct ifnet *, u_long);
244 void ip_freemoptions(struct ip_moptions *);
245 int ip_getmoptions(int, struct ip_moptions *, struct mbuf *);
246 void ip_init(void);
247 struct mbuf*
248 ip_insertoptions(struct mbuf *, struct mbuf *, int *);
249 int ip_mforward(struct mbuf *, struct ifnet *);
250 int ip_optcopy(struct ip *, struct ip *);
251 int ip_output(struct mbuf *, struct mbuf *, struct route *, int,
252 struct ip_moptions *, const struct ipsec_level *, u_int32_t);
253 u_int16_t
254 ip_randomid(void);
255 void ip_send(struct mbuf *);
256 void ip_send_raw(struct mbuf *);
257 void ip_slowtimo(void);
258 struct mbuf *
259 ip_srcroute(struct mbuf *);
260 void ip_stripoptions(struct mbuf *);
261 int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
262 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
263 struct mbuf *);
264 int ip_input_if(struct mbuf **, int *, int, int, struct ifnet *);
265 int ip_deliver(struct mbuf **, int *, int, int, int);
266 void ip_forward(struct mbuf *, struct ifnet *, struct route *, int);
267 int rip_ctloutput(int, struct socket *, int, int, struct mbuf *);
268 void rip_init(void);
269 int rip_input(struct mbuf **, int *, int, int);
270 int rip_output(struct mbuf *, struct socket *, struct sockaddr *,
271 struct mbuf *);
272 struct mbuf *
273 rip_chkhdr(struct mbuf *, struct mbuf *);
274 int rip_attach(struct socket *, int, int);
275 int rip_detach(struct socket *);
276 void rip_lock(struct socket *);
277 void rip_unlock(struct socket *);
278 int rip_locked(struct socket *);
279 int rip_bind(struct socket *, struct mbuf *, struct proc *);
280 int rip_connect(struct socket *, struct mbuf *);
281 int rip_disconnect(struct socket *);
282 int rip_shutdown(struct socket *);
283 int rip_send(struct socket *, struct mbuf *, struct mbuf *,
284 struct mbuf *);
285 #ifdef MROUTING
286 extern struct socket *ip_mrouter[]; /* multicast routing daemon */
287 #endif
288
289 #endif /* _KERNEL */
290 #endif /* _NETINET_IP_VAR_H_ */
291