Annotation of src/sys/netinet/ip_var.h, Revision 1.62
1.62 ! itojun 1: /* $NetBSD: ip_var.h,v 1.61 2003/11/25 14:44:13 itojun Exp $ */
1.10 cgd 2:
1.1 cgd 3: /*
1.9 mycroft 4: * Copyright (c) 1982, 1986, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
1.57 agc 15: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: *
1.24 thorpej 31: * @(#)ip_var.h 8.2 (Berkeley) 1/9/95
1.1 cgd 32: */
33:
1.25 perry 34: #ifndef _NETINET_IP_VAR_H_
35: #define _NETINET_IP_VAR_H_
1.53 martin 36:
1.15 cgd 37: #include <sys/queue.h>
1.30 thorpej 38: #include <net/route.h>
1.15 cgd 39:
1.1 cgd 40: /*
41: * Overlay for ip header used by other protocols (tcp, udp).
42: */
43: struct ipovly {
1.18 thorpej 44: u_int8_t ih_x1[9]; /* (unused) */
45: u_int8_t ih_pr; /* protocol */
46: u_int16_t ih_len; /* protocol length */
47: struct in_addr ih_src; /* source internet address */
48: struct in_addr ih_dst; /* destination internet address */
1.40 thorpej 49: } __attribute__((__packed__));
1.1 cgd 50:
51: /*
1.15 cgd 52: * Ip (reassembly or sequence) queue structures.
53: *
54: * XXX -- The following explains why the ipqe_m field is here, for TCP's use:
55: * We want to avoid doing m_pullup on incoming packets but that
56: * means avoiding dtom on the tcp reassembly code. That in turn means
57: * keeping an mbuf pointer in the reassembly queue (since we might
58: * have a cluster). As a quick hack, the source & destination
59: * port numbers (which are no longer needed once we've located the
60: * tcpcb) are overlayed with an mbuf pointer.
61: */
1.47 matt 62: TAILQ_HEAD(ipqehead, ipqent);
1.15 cgd 63: struct ipqent {
1.47 matt 64: TAILQ_ENTRY(ipqent) ipqe_q;
1.15 cgd 65: union {
66: struct ip *_ip;
67: struct tcpiphdr *_tcp;
68: } _ipqe_u1;
1.47 matt 69: struct mbuf *ipqe_m; /* point to first mbuf */
70: struct mbuf *ipre_mlast; /* point to last mbuf */
1.20 thorpej 71: u_int8_t ipqe_mff; /* for IP fragmentation */
1.28 matt 72: /*
73: * The following are used in TCP reassembly
74: */
1.47 matt 75: TAILQ_ENTRY(ipqent) ipqe_timeq;
1.28 matt 76: u_int32_t ipqe_seq;
77: u_int32_t ipqe_len;
78: u_int32_t ipqe_flags;
1.15 cgd 79: };
80: #define ipqe_ip _ipqe_u1._ip
81: #define ipqe_tcp _ipqe_u1._tcp
82:
83: /*
1.1 cgd 84: * Ip reassembly queue structure. Each fragment
85: * being reassembled is attached to one of these structures.
86: * They are timed out after ipq_ttl drops to 0, and may also
87: * be reclaimed if memory becomes tight.
88: */
89: struct ipq {
1.15 cgd 90: LIST_ENTRY(ipq) ipq_q; /* to other reass headers */
1.12 cgd 91: u_int8_t ipq_ttl; /* time for reass q to live */
92: u_int8_t ipq_p; /* protocol of this fragment */
93: u_int16_t ipq_id; /* sequence id for reassembly */
1.15 cgd 94: struct ipqehead ipq_fragq; /* to ip fragment queue */
1.14 mycroft 95: struct in_addr ipq_src, ipq_dst;
1.1 cgd 96: };
97:
98: /*
99: * Structure stored in mbuf in inpcb.ip_options
100: * and passed to ip_output when ip options are in use.
101: * The actual length of the options (including ipopt_dst)
102: * is in m_len.
103: */
1.5 mycroft 104: #define MAX_IPOPTLEN 40
1.1 cgd 105:
106: struct ipoption {
107: struct in_addr ipopt_dst; /* first-hop dst if source routed */
1.12 cgd 108: int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
1.1 cgd 109: };
110:
1.4 hpeyerl 111: /*
112: * Structure attached to inpcb.ip_moptions and
113: * passed to ip_output when IP multicast options are in use.
114: */
115: struct ip_moptions {
1.12 cgd 116: struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
1.44 itojun 117: struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
1.12 cgd 118: u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */
119: u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */
120: u_int16_t imo_num_memberships; /* no. memberships this socket */
121: struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
1.4 hpeyerl 122: };
123:
1.1 cgd 124: struct ipstat {
1.39 bouyer 125: u_quad_t ips_total; /* total packets received */
126: u_quad_t ips_badsum; /* checksum bad */
127: u_quad_t ips_tooshort; /* packet too short */
128: u_quad_t ips_toosmall; /* not enough data */
129: u_quad_t ips_badhlen; /* ip header length < data size */
130: u_quad_t ips_badlen; /* ip length < ip header length */
131: u_quad_t ips_fragments; /* fragments received */
132: u_quad_t ips_fragdropped; /* frags dropped (dups, out of space) */
133: u_quad_t ips_fragtimeout; /* fragments timed out */
134: u_quad_t ips_forward; /* packets forwarded */
135: u_quad_t ips_fastforward; /* packets fast forwarded */
136: u_quad_t ips_cantforward; /* packets rcvd for unreachable dest */
137: u_quad_t ips_redirectsent; /* packets forwarded on same net */
138: u_quad_t ips_noproto; /* unknown or unsupported protocol */
139: u_quad_t ips_delivered; /* datagrams delivered to upper level*/
140: u_quad_t ips_localout; /* total ip packets generated here */
141: u_quad_t ips_odropped; /* lost packets due to nobufs, etc. */
142: u_quad_t ips_reassembled; /* total packets reassembled ok */
1.50 wiz 143: u_quad_t ips_fragmented; /* datagrams successfully fragmented */
1.39 bouyer 144: u_quad_t ips_ofragments; /* output fragments created */
145: u_quad_t ips_cantfrag; /* don't fragment flag was set, etc. */
146: u_quad_t ips_badoptions; /* error in option processing */
147: u_quad_t ips_noroute; /* packets discarded due to no route */
148: u_quad_t ips_badvers; /* ip version != 4 */
149: u_quad_t ips_rawout; /* total raw ip packets generated */
150: u_quad_t ips_badfrags; /* malformed fragments (bad length) */
151: u_quad_t ips_rcvmemdrop; /* frags dropped for lack of memory */
152: u_quad_t ips_toolong; /* ip length > max ip packet size */
153: u_quad_t ips_nogif; /* no match gif found */
1.45 itojun 154: u_quad_t ips_badaddr; /* invalid address on header */
1.1 cgd 155: };
156:
1.29 matt 157: #define IPFLOW_HASHBITS 6 /* should not be a multiple of 8 */
158: struct ipflow {
1.34 thorpej 159: LIST_ENTRY(ipflow) ipf_list; /* next in active list */
160: LIST_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */
1.29 matt 161: struct in_addr ipf_dst; /* destination address */
162: struct in_addr ipf_src; /* source address */
163: u_int8_t ipf_tos; /* type-of-service */
164: struct route ipf_ro; /* associated route entry */
165: u_long ipf_uses; /* number of uses in this period */
166: u_long ipf_last_uses; /* number of uses in last period */
167: u_long ipf_dropped; /* ENOBUFS returned by if_output */
168: u_long ipf_errors; /* other errors returned by if_output */
1.34 thorpej 169: u_int ipf_timer; /* lifetime timer */
1.29 matt 170: time_t ipf_start; /* creation time */
171: };
172:
1.11 jtc 173: #ifdef _KERNEL
1.54 martin 174:
175: #ifdef _KERNEL_OPT
176: #include "opt_gateway.h"
177: #include "opt_mbuftrace.h"
178: #endif
179:
1.1 cgd 180: /* flags passed to ip_output as last parameter */
181: #define IP_FORWARDING 0x1 /* most of ip header exists */
1.9 mycroft 182: #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
1.21 thorpej 183: #define IP_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */
1.1 cgd 184: #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
185: #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
1.43 thorpej 186: #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */
1.48 thorpej 187:
188: #ifdef __NO_STRICT_ALIGNMENT
189: #define IP_HDR_ALIGNED_P(ip) 1
190: #else
191: #define IP_HDR_ALIGNED_P(ip) ((((vaddr_t) (ip)) & 3) == 0)
192: #endif
1.1 cgd 193:
1.29 matt 194: extern struct ipstat ipstat; /* ip statistics */
195: extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */
196: extern int ip_defttl; /* default IP ttl */
197: extern int ipforwarding; /* ip forwarding */
1.27 kml 198: extern int ip_mtudisc; /* mtu discovery */
1.49 itojun 199: extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */
1.27 kml 200: extern int anonportmin; /* minimum ephemeral port */
201: extern int anonportmax; /* maximum ephemeral port */
1.42 tron 202: extern int lowportmin; /* minimum reserved port */
203: extern int lowportmax; /* maximum reserved port */
1.27 kml 204: extern struct rttimer_queue *ip_mtudisc_timeout_q;
1.51 matt 205: #ifdef MBUFTRACE
206: extern struct mowner ip_rx_mowner;
207: extern struct mowner ip_tx_mowner;
208: #endif
1.31 matt 209: #ifdef GATEWAY
210: extern int ip_maxflows;
211: #endif
1.52 matt 212: extern struct pool inmulti_pool;
1.35 thorpej 213: extern struct pool ipqent_pool;
1.19 thorpej 214: struct inpcb;
215:
1.9 mycroft 216: int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
217: int ip_dooptions __P((struct mbuf *));
218: void ip_drain __P((void));
219: void ip_forward __P((struct mbuf *, int));
220: void ip_freef __P((struct ipq *));
221: void ip_freemoptions __P((struct ip_moptions *));
222: int ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **));
223: void ip_init __P((void));
224: int ip_optcopy __P((struct ip *, struct ip *));
1.26 kml 225: u_int ip_optlen __P((struct inpcb *));
1.16 christos 226: int ip_output __P((struct mbuf *, ...));
1.58 itojun 227: int ip_fragment(struct mbuf *, struct ifnet *, u_long);
1.9 mycroft 228: int ip_pcbopts __P((struct mbuf **, struct mbuf *));
1.20 thorpej 229: struct mbuf *
1.15 cgd 230: ip_reass __P((struct ipqent *, struct ipq *));
1.6 mycroft 231: struct in_ifaddr *
1.9 mycroft 232: ip_rtaddr __P((struct in_addr));
1.19 thorpej 233: void ip_savecontrol __P((struct inpcb *, struct mbuf **, struct ip *,
234: struct mbuf *));
1.9 mycroft 235: int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *));
236: void ip_slowtimo __P((void));
1.6 mycroft 237: struct mbuf *
1.9 mycroft 238: ip_srcroute __P((void));
239: void ip_stripoptions __P((struct mbuf *, struct mbuf *));
240: int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
241: void ipintr __P((void));
1.46 itojun 242: void * rip_ctlinput __P((int, struct sockaddr *, void *));
1.9 mycroft 243: int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
244: void rip_init __P((void));
1.16 christos 245: void rip_input __P((struct mbuf *, ...));
246: int rip_output __P((struct mbuf *, ...));
1.9 mycroft 247: int rip_usrreq __P((struct socket *,
1.56 fvdl 248: int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *));
1.36 thorpej 249: void ipflow_init __P((void));
1.31 matt 250: struct ipflow *ipflow_reap __P((int));
251: void ipflow_create __P((const struct route *, struct mbuf *));
252: void ipflow_slowtimo __P((void));
1.59 itojun 253:
1.60 jonathan 254: extern uint16_t ip_id;
255: static __inline uint16_t ip_newid __P((void));
256:
1.59 itojun 257: u_int16_t ip_randomid __P((void));
1.60 jonathan 258: extern int ip_do_randomid;
259:
260: static __inline uint16_t
261: ip_newid(void)
262: {
263: if (ip_do_randomid)
1.61 itojun 264: return ip_randomid();
1.60 jonathan 265:
266: return htons(ip_id++);
267: }
268:
269: #endif /* _KERNEL */
1.25 perry 270:
271: #endif /* _NETINET_IP_VAR_H_ */
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