Annotation of sys/netinet/ip_var.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ip_var.h,v 1.36 2006/05/29 20:42:27 claudio 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: #include <sys/queue.h>
39:
40: /*
41: * Overlay for ip header used by other protocols (tcp, udp).
42: */
43: struct ipovly {
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 */
49: };
50:
51: /*
52: * Ip reassembly queue structures.
53: */
54: LIST_HEAD(ipqehead, ipqent);
55: struct ipqent {
56: LIST_ENTRY(ipqent) ipqe_q;
57: struct ip *ipqe_ip;
58: struct mbuf *ipqe_m; /* mbuf contains packet */
59: u_int8_t ipqe_mff; /* for IP fragmentation */
60: };
61:
62: /*
63: * Ip reassembly queue structure. Each fragment
64: * being reassembled is attached to one of these structures.
65: * They are timed out after ipq_ttl drops to 0, and may also
66: * be reclaimed if memory becomes tight.
67: */
68: struct ipq {
69: LIST_ENTRY(ipq) ipq_q; /* to other reass headers */
70: u_int8_t ipq_ttl; /* time for reass q to live */
71: u_int8_t ipq_p; /* protocol of this fragment */
72: u_int16_t ipq_id; /* sequence id for reassembly */
73: struct ipqehead ipq_fragq; /* to ip fragment queue */
74: struct in_addr ipq_src, ipq_dst;
75: };
76:
77: /*
78: * Structure stored in mbuf in inpcb.ip_options
79: * and passed to ip_output when ip options are in use.
80: * The actual length of the options (including ipopt_dst)
81: * is in m_len.
82: */
83: #define MAX_IPOPTLEN 40
84:
85: struct ipoption {
86: struct in_addr ipopt_dst; /* first-hop dst if source routed */
87: int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
88: };
89:
90: /*
91: * Structure attached to inpcb.ip_moptions and
92: * passed to ip_output when IP multicast options are in use.
93: */
94: struct ip_moptions {
95: struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
96: u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */
97: u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */
98: u_int16_t imo_num_memberships; /* no. memberships this socket */
99: struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
100: };
101:
102: struct ipstat {
103: u_long ips_total; /* total packets received */
104: u_long ips_badsum; /* checksum bad */
105: u_long ips_tooshort; /* packet too short */
106: u_long ips_toosmall; /* not enough data */
107: u_long ips_badhlen; /* ip header length < data size */
108: u_long ips_badlen; /* ip length < ip header length */
109: u_long ips_fragments; /* fragments received */
110: u_long ips_fragdropped; /* frags dropped (dups, out of space) */
111: u_long ips_fragtimeout; /* fragments timed out */
112: u_long ips_forward; /* packets forwarded */
113: u_long ips_cantforward; /* packets rcvd for unreachable dest */
114: u_long ips_redirectsent; /* packets forwarded on same net */
115: u_long ips_noproto; /* unknown or unsupported protocol */
116: u_long ips_delivered; /* datagrams delivered to upper level*/
117: u_long ips_localout; /* total ip packets generated here */
118: u_long ips_odropped; /* lost packets due to nobufs, etc. */
119: u_long ips_reassembled; /* total packets reassembled ok */
120: u_long ips_fragmented; /* datagrams successfully fragmented */
121: u_long ips_ofragments; /* output fragments created */
122: u_long ips_cantfrag; /* don't fragment flag was set, etc. */
123: u_long ips_badoptions; /* error in option processing */
124: u_long ips_noroute; /* packets discarded due to no route */
125: u_long ips_badvers; /* ip version != 4 */
126: u_long ips_rawout; /* total raw ip packets generated */
127: u_long ips_badfrags; /* malformed fragments (bad length) */
128: u_long ips_rcvmemdrop; /* frags dropped for lack of memory */
129: u_long ips_toolong; /* ip length > max ip packet size */
130: u_long ips_nogif; /* no match gif found */
131: u_long ips_badaddr; /* invalid address on header */
132: u_long ips_inhwcsum; /* hardware checksummed on input */
133: u_long ips_outhwcsum; /* hardware checksummed on output */
134: u_long ips_notmember; /* multicasts for unregistered groups */
135: };
136:
137: #ifdef _KERNEL
138: /* flags passed to ip_output as last parameter */
139: #define IP_FORWARDING 0x1 /* most of ip header exists */
140: #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
141: #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
142: #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
143: #define IP_JUMBO SO_JUMBO /* try to use the jumbo mtu */
144: #define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */
145: #define IP_ROUTETOETHER 0x1000 /* ether addresses given */
146:
147: extern struct ipstat ipstat;
148: extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */
149: extern int ip_defttl; /* default IP ttl */
150:
151: extern int ip_mtudisc; /* mtu discovery */
152: extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */
153: extern struct rttimer_queue *ip_mtudisc_timeout_q;
154: extern struct pool ipqent_pool;
155: struct inpcb;
156:
157: int ip_ctloutput(int, struct socket *, int, int, struct mbuf **);
158: int ip_dooptions(struct mbuf *);
159: void ip_drain(void);
160: void ip_flush(void);
161: void ip_forward(struct mbuf *, int);
162: int ip_fragment(struct mbuf *, struct ifnet *, u_long);
163: void ip_freef(struct ipq *);
164: void ip_freemoptions(struct ip_moptions *);
165: int ip_getmoptions(int, struct ip_moptions *, struct mbuf **);
166: void ip_init(void);
167: int ip_mforward(struct mbuf *, struct ifnet *);
168: int ip_optcopy(struct ip *, struct ip *);
169: int ip_output(struct mbuf *, ...);
170: int ip_pcbopts(struct mbuf **, struct mbuf *);
171: struct mbuf *
172: ip_reass(struct ipqent *, struct ipq *);
173: struct in_ifaddr *
174: in_iawithaddr(struct in_addr, struct mbuf *);
175: struct in_ifaddr *
176: ip_rtaddr(struct in_addr);
177: u_int16_t
178: ip_randomid(void);
179: int ip_setmoptions(int, struct ip_moptions **, struct mbuf *);
180: void ip_slowtimo(void);
181: struct mbuf *
182: ip_srcroute(void);
183: void ip_stripoptions(struct mbuf *, struct mbuf *);
184: int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
185: void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
186: struct mbuf *);
187: void ipintr(void);
188: void ipv4_input(struct mbuf *);
189: int rip_ctloutput(int, struct socket *, int, int, struct mbuf **);
190: void rip_init(void);
191: void rip_input(struct mbuf *, ...);
192: int rip_output(struct mbuf *, ...);
193: int rip_usrreq(struct socket *,
194: int, struct mbuf *, struct mbuf *, struct mbuf *);
195: #endif /* _KERNEL */
196: #endif /* _NETINET_IP_VAR_H_ */
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