Line data Source code
1 : /* $OpenBSD: ip_var.h,v 1.85 2017/11/15 11:48:59 mpi 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 packets 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 : };
91 :
92 : struct ipoption {
93 : struct in_addr ipopt_dst; /* first-hop dst if source routed */
94 : int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
95 : };
96 :
97 : #ifdef _KERNEL
98 :
99 : #include <sys/percpu.h>
100 :
101 : enum ipstat_counters {
102 : ips_total, /* total packets received */
103 : ips_badsum, /* checksum bad */
104 : ips_tooshort, /* packet too short */
105 : ips_toosmall, /* not enough data */
106 : ips_badhlen, /* ip header length < data size */
107 : ips_badlen, /* ip length < ip header length */
108 : ips_fragments, /* fragments received */
109 : ips_fragdropped, /* frags dropped (dups, out of space) */
110 : ips_fragtimeout, /* fragments timed out */
111 : ips_forward, /* packets forwarded */
112 : ips_cantforward, /* packets rcvd for unreachable dest */
113 : ips_redirectsent, /* packets forwarded on same net */
114 : ips_noproto, /* unknown or unsupported protocol */
115 : ips_delivered, /* datagrams delivered to upper level*/
116 : ips_localout, /* total ip packets generated here */
117 : ips_odropped, /* lost packets due to nobufs, etc. */
118 : ips_reassembled, /* total packets reassembled ok */
119 : ips_fragmented, /* datagrams successfully fragmented */
120 : ips_ofragments, /* output fragments created */
121 : ips_cantfrag, /* don't fragment flag was set, etc. */
122 : ips_badoptions, /* error in option processing */
123 : ips_noroute, /* packets discarded due to no route */
124 : ips_badvers, /* ip version != 4 */
125 : ips_rawout, /* total raw ip packets generated */
126 : ips_badfrags, /* malformed fragments (bad length) */
127 : ips_rcvmemdrop, /* frags dropped for lack of memory */
128 : ips_toolong, /* ip length > max ip packet size */
129 : ips_nogif, /* no match gif found */
130 : ips_badaddr, /* invalid address on header */
131 : ips_inswcsum, /* software checksummed on input */
132 : ips_outswcsum, /* software checksummed on output */
133 : ips_notmember, /* multicasts for unregistered groups */
134 :
135 : ips_ncounters
136 : };
137 :
138 : extern struct cpumem *ipcounters;
139 :
140 : static inline void
141 0 : ipstat_inc(enum ipstat_counters c)
142 : {
143 0 : counters_inc(ipcounters, c);
144 0 : }
145 :
146 : /*
147 : * Structure attached to inpcb.ip_moptions and
148 : * passed to ip_output when IP multicast options are in use.
149 : */
150 : struct ip_moptions {
151 : struct in_multi **imo_membership; /* group memberships */
152 : unsigned short imo_ifidx; /* ifp index for outgoing multicasts */
153 : u_int8_t imo_ttl; /* TTL for outgoing multicasts */
154 : u_int8_t imo_loop; /* 1 => hear sends if a member */
155 : u_int16_t imo_num_memberships; /* no. memberships this socket */
156 : u_int16_t imo_max_memberships; /* max memberships this socket */
157 : };
158 :
159 : #include <sys/queue.h>
160 :
161 : /*
162 : * Ip reassembly queue structures.
163 : */
164 : LIST_HEAD(ipqehead, ipqent);
165 : struct ipqent {
166 : LIST_ENTRY(ipqent) ipqe_q;
167 : struct ip *ipqe_ip;
168 : struct mbuf *ipqe_m; /* mbuf contains packet */
169 : u_int8_t ipqe_mff; /* for IP fragmentation */
170 : };
171 :
172 : /*
173 : * Ip reassembly queue structure. Each fragment
174 : * being reassembled is attached to one of these structures.
175 : * They are timed out after ipq_ttl drops to 0, and may also
176 : * be reclaimed if memory becomes tight.
177 : */
178 : struct ipq {
179 : LIST_ENTRY(ipq) ipq_q; /* to other reass headers */
180 : u_int8_t ipq_ttl; /* time for reass q to live */
181 : u_int8_t ipq_p; /* protocol of this fragment */
182 : u_int16_t ipq_id; /* sequence id for reassembly */
183 : struct ipqehead ipq_fragq; /* to ip fragment queue */
184 : struct in_addr ipq_src, ipq_dst;
185 : };
186 :
187 : /* flags passed to ip_output */
188 : #define IP_FORWARDING 0x1 /* most of ip header exists */
189 : #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
190 : #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
191 : #define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */
192 :
193 : extern struct ipstat ipstat;
194 : extern int ip_defttl; /* default IP ttl */
195 :
196 : #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
197 :
198 : extern int ip_mtudisc; /* mtu discovery */
199 : extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */
200 :
201 : extern int ipport_firstauto; /* min port for port allocation */
202 : extern int ipport_lastauto; /* max port for port allocation */
203 : extern int ipport_hifirstauto; /* min dynamic/private port number */
204 : extern int ipport_hilastauto; /* max dynamic/private port number */
205 : extern int ipforwarding; /* enable IP forwarding */
206 : #ifdef MROUTING
207 : extern int ipmforwarding; /* enable multicast forwarding */
208 : #endif
209 : extern int ipmultipath; /* enable multipath routing */
210 : extern int la_hold_total;
211 :
212 : extern struct rttimer_queue *ip_mtudisc_timeout_q;
213 : extern struct pool ipqent_pool;
214 : struct route;
215 : struct inpcb;
216 :
217 : int ip_ctloutput(int, struct socket *, int, int, struct mbuf *);
218 : void ip_flush(void);
219 : int ip_fragment(struct mbuf *, struct ifnet *, u_long);
220 : void ip_freef(struct ipq *);
221 : void ip_freemoptions(struct ip_moptions *);
222 : int ip_getmoptions(int, struct ip_moptions *, struct mbuf *);
223 : void ip_init(void);
224 : struct mbuf*
225 : ip_insertoptions(struct mbuf *, struct mbuf *, int *);
226 : int ip_mforward(struct mbuf *, struct ifnet *);
227 : int ip_optcopy(struct ip *, struct ip *);
228 : int ip_output(struct mbuf *, struct mbuf *, struct route *, int,
229 : struct ip_moptions *, struct inpcb *, u_int32_t);
230 : struct mbuf *
231 : ip_reass(struct ipqent *, struct ipq *);
232 : u_int16_t
233 : ip_randomid(void);
234 : void ip_send(struct mbuf *);
235 : void ip_slowtimo(void);
236 : struct mbuf *
237 : ip_srcroute(struct mbuf *);
238 : void ip_stripoptions(struct mbuf *);
239 : int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
240 : void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
241 : struct mbuf *);
242 : void ipintr(void);
243 : int ip_input_if(struct mbuf **, int *, int, int, struct ifnet *);
244 : int ip_deliver(struct mbuf **, int *, int, int);
245 : void ip_forward(struct mbuf *, struct ifnet *, struct rtentry *, int);
246 : int rip_ctloutput(int, struct socket *, int, int, struct mbuf *);
247 : void rip_init(void);
248 : int rip_input(struct mbuf **, int *, int, int);
249 : int rip_output(struct mbuf *, struct socket *, struct sockaddr *,
250 : struct mbuf *);
251 : int rip_usrreq(struct socket *,
252 : int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *);
253 : int rip_attach(struct socket *, int);
254 : int rip_detach(struct socket *);
255 : #ifdef MROUTING
256 : extern struct socket *ip_mrouter[]; /* multicast routing daemon */
257 : #endif
258 :
259 : #endif /* _KERNEL */
260 : #endif /* _NETINET_IP_VAR_H_ */
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