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 * 3. 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: src/sys/netinet/ip_var.h,v 1.50.2.13 2003/08/24 08:24:38 hsu Exp $
31 */
32
33 #ifndef _NETINET_IP_VAR_H_
34 #define _NETINET_IP_VAR_H_
35
36 #ifndef _SYS_TYPES_H_
37 #include <sys/types.h>
38 #endif
39 #ifndef _SYS_QUEUE_H_
40 #include <sys/queue.h>
41 #endif
42 #ifndef _NETINET_IN_H_
43 #include <netinet/in.h>
44 #endif
45
46 #ifdef _KERNEL
47
48 #include <machine/endian.h>
49 #ifndef _MACHINE_PARAM_H_
50 #include <machine/param.h>
51 #endif
52 #ifndef _NET_ROUTE_H
53 #include <net/route.h>
54 #endif
55
56 #endif
57
58 /*
59 * Overlay for ip header used by other protocols (tcp, udp).
60 */
61 struct ipovly {
62 u_char ih_x1[9]; /* (unused) */
63 u_char ih_pr; /* protocol */
64 u_short ih_len; /* protocol length */
65 struct in_addr ih_src; /* source internet address */
66 struct in_addr ih_dst; /* destination internet address */
67 };
68
69 /*
70 * Ip reassembly queue structure. Each fragment
71 * being reassembled is attached to one of these structures.
72 * They are timed out after ipq_ttl drops to 0, and may also
73 * be reclaimed if memory becomes tight.
74 */
75 struct ipq {
76 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */
77 u_char ipq_ttl; /* time for reass q to live */
78 u_char ipq_p; /* protocol of this fragment */
79 u_short ipq_id; /* sequence id for reassembly */
80 struct mbuf *ipq_frags; /* to ip headers of fragments */
81 struct in_addr ipq_src,ipq_dst;
82 u_char ipq_nfrags; /* # frags in this packet */
83 };
84
85 /*
86 * Structure stored in mbuf in inpcb.ip_options
87 * and passed to ip_output when ip options are in use.
88 * The actual length of the options (including ipopt_dst)
89 * is in m_len.
90 */
91 #define MAX_IPOPTLEN 40
92
93 struct ipoption {
94 struct in_addr ipopt_dst; /* first-hop dst if source routed */
95 char ipopt_list[MAX_IPOPTLEN]; /* options proper */
96 };
97
98 /*
99 * Structure attached to inpcb.ip_moptions and
100 * passed to ip_output when IP multicast options are in use.
101 */
102 struct ip_moptions {
103 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
104 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
105 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */
106 u_char imo_multicast_loop; /* 1 => hear sends if a member */
107 u_short imo_num_memberships; /* no. memberships this socket */
108 u_short imo_max_memberships; /* max memberships this socket */
109 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
110 u_long imo_multicast_vif; /* vif num outgoing multicasts */
111 };
112
113 /*
114 * IP Statistics.
115 *
116 * NOTE: Make sure this struct's size is multiple cache line size.
117 */
118 struct ip_stats {
119 u_long ips_total; /* total packets received */
120 u_long ips_badsum; /* checksum bad */
121 u_long ips_tooshort; /* packet too short */
122 u_long ips_toosmall; /* not enough data */
123 u_long ips_badhlen; /* ip header length < data size */
124 u_long ips_badlen; /* ip length < ip header length */
125 u_long ips_fragments; /* fragments received */
126 u_long ips_fragdropped; /* frags dropped (dups, out of space) */
127 u_long ips_fragtimeout; /* fragments timed out */
128 u_long ips_forward; /* packets forwarded */
129 u_long ips_fastforward; /* packets fast forwarded */
130 u_long ips_cantforward; /* packets rcvd for unreachable dest */
131 u_long ips_redirectsent; /* packets forwarded on same net */
132 u_long ips_noproto; /* unknown or unsupported protocol */
133 u_long ips_delivered; /* datagrams delivered to upper level*/
134 u_long ips_localout; /* total ip packets generated here */
135 u_long ips_odropped; /* lost packets due to nobufs, etc. */
136 u_long ips_reassembled; /* total packets reassembled ok */
137 u_long ips_fragmented; /* datagrams successfully fragmented */
138 u_long ips_ofragments; /* output fragments created */
139 u_long ips_cantfrag; /* don't fragment flag was set, etc. */
140 u_long ips_badoptions; /* error in option processing */
141 u_long ips_noroute; /* packets discarded due to no route */
142 u_long ips_badvers; /* ip version != 4 */
143 u_long ips_rawout; /* total raw ip packets generated */
144 u_long ips_toolong; /* ip length > max ip packet size */
145 u_long ips_notmember; /* multicasts for unregistered grps */
146 u_long ips_nogif; /* no match gif found */
147 u_long ips_badaddr; /* invalid address on header */
148 u_long ips_pad[3]; /* pad to cache line size (64B) */
149 };
150 #ifdef _KERNEL
151 CTASSERT((sizeof(struct ip_stats) & __VM_CACHELINE_MASK) == 0);
152 #endif
153
154 #ifdef _KERNEL
155
156 #define ipstat ipstats_percpu[mycpuid]
157
158 extern struct ip_stats ipstats_percpu[MAXCPU];
159
160 /* flags passed to ip_output as last parameter */
161 #define IP_FORWARDING 0x1 /* most of ip header exists */
162 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
163 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
164 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
165 #define IP_DEBUGROUTE 0x10000 /* debug route */
166
167 struct ip;
168 struct inpcb;
169 struct route;
170 struct sockopt;
171 struct lwkt_port;
172 struct pktinfo;
173 union netmsg;
174
175 extern u_short ip_id; /* ip packet ctr, for ids */
176 extern int ip_defttl; /* default IP ttl */
177 extern int ipforwarding; /* ip forwarding */
178 extern int ip_porthash_trycount;
179 extern u_char ip_protox[];
180 extern struct socket *ip_rsvpd; /* reservation protocol daemon */
181 extern struct socket *ip_mrouter; /* multicast routing daemon */
182 extern int (*legal_vif_num)(int);
183 extern u_long (*ip_mcast_src)(int);
184 extern int rsvp_on;
185 extern struct pr_usrreqs rip_usrreqs;
186
187 void ip_ctloutput(union netmsg *);
188 void ip_drain(void);
189 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
190 u_long if_hwassist_flags, int sw_csum);
191 struct mbuf *
192 ip_reass(struct mbuf *);
193 void ip_freemoptions(struct ip_moptions *);
194 void ip_init(void);
195 extern int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
196 struct ip_moptions *);
197
198 void ip_hashfn(struct mbuf **, int);
199 void ip_hashcheck(struct mbuf *, const struct pktinfo *);
200 struct mbuf *
201 ip_rehashm(struct mbuf *);
202 void ip_transport_redispatch(struct lwkt_port *, struct mbuf *, int);
203
204 boolean_t
205 ip_lengthcheck(struct mbuf **, int);
206 int ip_output(struct mbuf *,
207 struct mbuf *, struct route *, int, struct ip_moptions *,
208 struct inpcb *);
209 struct in_ifaddr *
210 ip_rtaddr(struct in_addr, struct route *);
211 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
212 struct mbuf *);
213 struct mbuf *
214 ip_srcroute(struct mbuf *);
215 void ip_stripoptions(struct mbuf *);
216 u_int16_t ip_randomid(void);
217 void rip_ctloutput(union netmsg *);
218 void rip_init(void);
219 int rip_input(struct mbuf **, int *, int);
220 int rip_output(struct mbuf *, struct socket *, ...);
221 extern int (*ipip_input)(struct mbuf **, int *, int);
222 int rsvp_input(struct mbuf **, int *, int);
223 int ip_rsvp_init(struct socket *);
224 int ip_rsvp_done(void);
225 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
226 extern void (*ip_rsvp_force_done)(struct socket *);
227 extern int (*rsvp_input_p)(struct mbuf **, int *, int);
228
229 extern struct pfil_head inet_pfil_hook;
230
231 void in_delayed_cksum(struct mbuf *m);
232
233 static __inline uint16_t ip_newid(void);
234 extern int ip_do_randomid;
235
236 static __inline uint16_t
ip_newid(void)237 ip_newid(void)
238 {
239 if (ip_do_randomid)
240 return ip_randomid();
241 else
242 return __htons(ip_id++);
243 }
244
245 #endif /* _KERNEL */
246
247 #endif /* !_NETINET_IP_VAR_H_ */
248