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 * $FreeBSD$
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 int ipq_maxoff; /* total length of packet */
62 struct mbuf *ipq_frags; /* to ip headers of fragments */
63 struct in_addr ipq_src,ipq_dst;
64 u_char ipq_nfrags; /* # frags in this packet */
65 struct label *ipq_label; /* MAC label */
66 };
67 #endif /* _KERNEL */
68
69 /*
70 * Structure stored in mbuf in inpcb.ip_options
71 * and passed to ip_output when ip options are in use.
72 * The actual length of the options (including ipopt_dst)
73 * is in m_len.
74 */
75 #define MAX_IPOPTLEN 40
76
77 struct ipoption {
78 struct in_addr ipopt_dst; /* first-hop dst if source routed */
79 char ipopt_list[MAX_IPOPTLEN]; /* options proper */
80 };
81
82 /*
83 * Structure attached to inpcb.ip_moptions and
84 * passed to ip_output when IP multicast options are in use.
85 * This structure is lazy-allocated.
86 */
87 struct ip_moptions {
88 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
89 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
90 u_long imo_multicast_vif; /* vif num outgoing multicasts */
91 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */
92 u_char imo_multicast_loop; /* 1 => hear sends if a member */
93 u_short imo_num_memberships; /* no. memberships this socket */
94 u_short imo_max_memberships; /* max memberships this socket */
95 struct in_multi **imo_membership; /* group memberships */
96 struct in_mfilter *imo_mfilters; /* source filters */
97 STAILQ_ENTRY(ip_moptions) imo_link;
98 };
99
100 struct ipstat {
101 uint64_t ips_total; /* total packets received */
102 uint64_t ips_badsum; /* checksum bad */
103 uint64_t ips_tooshort; /* packet too short */
104 uint64_t ips_toosmall; /* not enough data */
105 uint64_t ips_badhlen; /* ip header length < data size */
106 uint64_t ips_badlen; /* ip length < ip header length */
107 uint64_t ips_fragments; /* fragments received */
108 uint64_t ips_fragdropped; /* frags dropped (dups, out of space) */
109 uint64_t ips_fragtimeout; /* fragments timed out */
110 uint64_t ips_forward; /* packets forwarded */
111 uint64_t ips_fastforward; /* packets fast forwarded */
112 uint64_t ips_cantforward; /* packets rcvd for unreachable dest */
113 uint64_t ips_redirectsent; /* packets forwarded on same net */
114 uint64_t ips_noproto; /* unknown or unsupported protocol */
115 uint64_t ips_delivered; /* datagrams delivered to upper level*/
116 uint64_t ips_localout; /* total ip packets generated here */
117 uint64_t ips_odropped; /* lost packets due to nobufs, etc. */
118 uint64_t ips_reassembled; /* total packets reassembled ok */
119 uint64_t ips_fragmented; /* datagrams successfully fragmented */
120 uint64_t ips_ofragments; /* output fragments created */
121 uint64_t ips_cantfrag; /* don't fragment flag was set, etc. */
122 uint64_t ips_badoptions; /* error in option processing */
123 uint64_t ips_noroute; /* packets discarded due to no route */
124 uint64_t ips_badvers; /* ip version != 4 */
125 uint64_t ips_rawout; /* total raw ip packets generated */
126 uint64_t ips_toolong; /* ip length > max ip packet size */
127 uint64_t ips_notmember; /* multicasts for unregistered grps */
128 uint64_t ips_nogif; /* no match gif found */
129 uint64_t ips_badaddr; /* invalid address on header */
130 };
131
132 #ifdef _KERNEL
133
134 #include <sys/counter.h>
135 #include <net/vnet.h>
136
137 VNET_PCPUSTAT_DECLARE(struct ipstat, ipstat);
138 /*
139 * In-kernel consumers can use these accessor macros directly to update
140 * stats.
141 */
142 #define IPSTAT_ADD(name, val) \
143 VNET_PCPUSTAT_ADD(struct ipstat, ipstat, name, (val))
144 #define IPSTAT_SUB(name, val) IPSTAT_ADD(name, -(val))
145 #define IPSTAT_INC(name) IPSTAT_ADD(name, 1)
146 #define IPSTAT_DEC(name) IPSTAT_SUB(name, 1)
147
148 /*
149 * Kernel module consumers must use this accessor macro.
150 */
151 void kmod_ipstat_inc(int statnum);
152 #define KMOD_IPSTAT_INC(name) \
153 kmod_ipstat_inc(offsetof(struct ipstat, name) / sizeof(uint64_t))
154 void kmod_ipstat_dec(int statnum);
155 #define KMOD_IPSTAT_DEC(name) \
156 kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(uint64_t))
157
158 /* flags passed to ip_output as last parameter */
159 #define IP_FORWARDING 0x1 /* most of ip header exists */
160 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
161 #define IP_SENDONES 0x4 /* send all-ones broadcast */
162 #define IP_SENDTOIF 0x8 /* send on specific ifnet */
163 #define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */
164 #define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */
165 #define IP_NODEFAULTFLOWID 0x40 /* Don't set the flowid from inp */
166
167 #ifdef __NO_STRICT_ALIGNMENT
168 #define IP_HDR_ALIGNED_P(ip) 1
169 #else
170 #define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
171 #endif
172
173 struct ip;
174 struct inpcb;
175 struct route;
176 struct sockopt;
177
178 VNET_DECLARE(int, ip_defttl); /* default IP ttl */
179 VNET_DECLARE(int, ipforwarding); /* ip forwarding */
180 #ifdef IPSTEALTH
181 VNET_DECLARE(int, ipstealth); /* stealth forwarding */
182 #endif
183 extern u_char ip_protox[];
184 VNET_DECLARE(struct socket *, ip_rsvpd); /* reservation protocol daemon*/
185 VNET_DECLARE(struct socket *, ip_mrouter); /* multicast routing daemon */
186 extern int (*legal_vif_num)(int);
187 extern u_long (*ip_mcast_src)(int);
188 VNET_DECLARE(int, rsvp_on);
189 VNET_DECLARE(int, drop_redirect);
190 extern struct pr_usrreqs rip_usrreqs;
191
192 #define V_ip_id VNET(ip_id)
193 #define V_ip_defttl VNET(ip_defttl)
194 #define V_ipforwarding VNET(ipforwarding)
195 #ifdef IPSTEALTH
196 #define V_ipstealth VNET(ipstealth)
197 #endif
198 #define V_ip_rsvpd VNET(ip_rsvpd)
199 #define V_ip_mrouter VNET(ip_mrouter)
200 #define V_rsvp_on VNET(rsvp_on)
201 #define V_drop_redirect VNET(drop_redirect)
202
203 void inp_freemoptions(struct ip_moptions *);
204 int inp_getmoptions(struct inpcb *, struct sockopt *);
205 int inp_setmoptions(struct inpcb *, struct sockopt *);
206
207 int ip_ctloutput(struct socket *, struct sockopt *sopt);
208 void ip_drain(void);
209 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
210 u_long if_hwassist_flags);
211 void ip_forward(struct mbuf *m, int srcrt);
212 void ip_init(void);
213 extern int
214 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
215 struct ip_moptions *);
216 int ip_output(struct mbuf *,
217 struct mbuf *, struct route *, int, struct ip_moptions *,
218 struct inpcb *);
219 int ipproto_register(short);
220 int ipproto_unregister(short);
221 struct mbuf *
222 ip_reass(struct mbuf *);
223 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
224 struct mbuf *);
225 void ip_slowtimo(void);
226 void ip_fillid(struct ip *);
227 int rip_ctloutput(struct socket *, struct sockopt *);
228 void rip_ctlinput(int, struct sockaddr *, void *);
229 void rip_init(void);
230 int rip_input(struct mbuf **, int *, int);
231 int rip_output(struct mbuf *, struct socket *, ...);
232 int ipip_input(struct mbuf **, int *, int);
233 int rsvp_input(struct mbuf **, int *, int);
234 int ip_rsvp_init(struct socket *);
235 int ip_rsvp_done(void);
236 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
237 extern void (*ip_rsvp_force_done)(struct socket *);
238 extern int (*rsvp_input_p)(struct mbuf **, int *, int);
239
240 VNET_DECLARE(struct pfil_head, inet_pfil_hook); /* packet filter hooks */
241 #define V_inet_pfil_hook VNET(inet_pfil_hook)
242
243 void in_delayed_cksum(struct mbuf *m);
244
245 /* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */
246 /*
247 * Reference to an ipfw or packet filter rule that can be carried
248 * outside critical sections.
249 * A rule is identified by rulenum:rule_id which is ordered.
250 * In version chain_id the rule can be found in slot 'slot', so
251 * we don't need a lookup if chain_id == chain->id.
252 *
253 * On exit from the firewall this structure refers to the rule after
254 * the matching one (slot points to the new rule; rulenum:rule_id-1
255 * is the matching rule), and additional info (e.g. info often contains
256 * the insn argument or tablearg in the low 16 bits, in host format).
257 * On entry, the structure is valid if slot>0, and refers to the starting
258 * rules. 'info' contains the reason for reinject, e.g. divert port,
259 * divert direction, and so on.
260 */
261 struct ipfw_rule_ref {
262 uint32_t slot; /* slot for matching rule */
263 uint32_t rulenum; /* matching rule number */
264 uint32_t rule_id; /* matching rule id */
265 uint32_t chain_id; /* ruleset id */
266 uint32_t info; /* see below */
267 };
268
269 enum {
270 IPFW_INFO_MASK = 0x0000ffff,
271 IPFW_INFO_OUT = 0x00000000, /* outgoing, just for convenience */
272 IPFW_INFO_IN = 0x80000000, /* incoming, overloads dir */
273 IPFW_ONEPASS = 0x40000000, /* One-pass, do not reinject */
274 IPFW_IS_MASK = 0x30000000, /* which source ? */
275 IPFW_IS_DIVERT = 0x20000000,
276 IPFW_IS_DUMMYNET =0x10000000,
277 IPFW_IS_PIPE = 0x08000000, /* pipe=1, queue = 0 */
278 };
279 #define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */
280 #define MTAG_IPFW_RULE 1262273568 /* rule reference */
281 #define MTAG_IPFW_CALL 1308397630 /* call stack */
282
283 struct ip_fw_args;
284 typedef int (*ip_fw_chk_ptr_t)(struct ip_fw_args *args);
285 typedef int (*ip_fw_ctl_ptr_t)(struct sockopt *);
286 VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr);
287 #define V_ip_fw_ctl_ptr VNET(ip_fw_ctl_ptr)
288
289 /* Divert hooks. */
290 extern void (*ip_divert_ptr)(struct mbuf *m, int incoming);
291 /* ng_ipfw hooks -- XXX make it the same as divert and dummynet */
292 extern int (*ng_ipfw_input_p)(struct mbuf **, int,
293 struct ip_fw_args *, int);
294
295 extern int (*ip_dn_ctl_ptr)(struct sockopt *);
296 extern int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *);
297 #endif /* _KERNEL */
298
299 #endif /* !_NETINET_IP_VAR_H_ */
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