ip_var.h revision 126239
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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ip_var.h 8.2 (Berkeley) 1/9/95 34 * $FreeBSD: head/sys/netinet/ip_var.h 126239 2004-02-25 19:55:29Z mlaier $ 35 */ 36 37#ifndef _NETINET_IP_VAR_H_ 38#define _NETINET_IP_VAR_H_ 39 40#include <sys/queue.h> 41 42/* 43 * Overlay for ip header used by other protocols (tcp, udp). 44 */ 45struct ipovly { 46 u_char ih_x1[9]; /* (unused) */ 47 u_char ih_pr; /* protocol */ 48 u_short ih_len; /* protocol length */ 49 struct in_addr ih_src; /* source internet address */ 50 struct in_addr ih_dst; /* destination internet address */ 51}; 52 53#ifdef _KERNEL 54/* 55 * Ip reassembly queue structure. Each fragment 56 * being reassembled is attached to one of these structures. 57 * They are timed out after ipq_ttl drops to 0, and may also 58 * be reclaimed if memory becomes tight. 59 */ 60struct ipq { 61 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */ 62 u_char ipq_ttl; /* time for reass q to live */ 63 u_char ipq_p; /* protocol of this fragment */ 64 u_short ipq_id; /* sequence id for reassembly */ 65 struct mbuf *ipq_frags; /* to ip headers of fragments */ 66 struct in_addr ipq_src,ipq_dst; 67 u_char ipq_nfrags; /* # frags in this packet */ 68 struct label *ipq_label; /* MAC label */ 69}; 70#endif /* _KERNEL */ 71 72/* 73 * Structure stored in mbuf in inpcb.ip_options 74 * and passed to ip_output when ip options are in use. 75 * The actual length of the options (including ipopt_dst) 76 * is in m_len. 77 */ 78#define MAX_IPOPTLEN 40 79 80struct ipoption { 81 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 82 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 83}; 84 85/* 86 * Structure attached to inpcb.ip_moptions and 87 * passed to ip_output when IP multicast options are in use. 88 */ 89struct ip_moptions { 90 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 91 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 92 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 93 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 94 u_short imo_num_memberships; /* no. memberships this socket */ 95 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 96 u_long imo_multicast_vif; /* vif num outgoing multicasts */ 97}; 98 99struct ipstat { 100 u_long ips_total; /* total packets received */ 101 u_long ips_badsum; /* checksum bad */ 102 u_long ips_tooshort; /* packet too short */ 103 u_long ips_toosmall; /* not enough data */ 104 u_long ips_badhlen; /* ip header length < data size */ 105 u_long ips_badlen; /* ip length < ip header length */ 106 u_long ips_fragments; /* fragments received */ 107 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 108 u_long ips_fragtimeout; /* fragments timed out */ 109 u_long ips_forward; /* packets forwarded */ 110 u_long ips_fastforward; /* packets fast forwarded */ 111 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 112 u_long ips_redirectsent; /* packets forwarded on same net */ 113 u_long ips_noproto; /* unknown or unsupported protocol */ 114 u_long ips_delivered; /* datagrams delivered to upper level*/ 115 u_long ips_localout; /* total ip packets generated here */ 116 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 117 u_long ips_reassembled; /* total packets reassembled ok */ 118 u_long ips_fragmented; /* datagrams successfully fragmented */ 119 u_long ips_ofragments; /* output fragments created */ 120 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 121 u_long ips_badoptions; /* error in option processing */ 122 u_long ips_noroute; /* packets discarded due to no route */ 123 u_long ips_badvers; /* ip version != 4 */ 124 u_long ips_rawout; /* total raw ip packets generated */ 125 u_long ips_toolong; /* ip length > max ip packet size */ 126 u_long ips_notmember; /* multicasts for unregistered grps */ 127 u_long ips_nogif; /* no match gif found */ 128 u_long ips_badaddr; /* invalid address on header */ 129}; 130 131#ifdef _KERNEL 132 133/* flags passed to ip_output as last parameter */ 134#define IP_FORWARDING 0x1 /* most of ip header exists */ 135#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 136#define IP_SENDONES 0x4 /* send all-ones broadcast */ 137#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 138#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 139 140/* mbuf flag used by ip_fastfwd */ 141#define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */ 142 143struct ip; 144struct inpcb; 145struct route; 146struct sockopt; 147 148extern struct ipstat ipstat; 149#ifndef RANDOM_IP_ID 150extern u_short ip_id; /* ip packet ctr, for ids */ 151#endif 152extern int ip_defttl; /* default IP ttl */ 153extern int ipforwarding; /* ip forwarding */ 154#ifdef IPSTEALTH 155extern int ipstealth; /* stealth forwarding */ 156#endif 157extern u_char ip_protox[]; 158extern struct socket *ip_rsvpd; /* reservation protocol daemon */ 159extern struct socket *ip_mrouter; /* multicast routing daemon */ 160extern int (*legal_vif_num)(int); 161extern u_long (*ip_mcast_src)(int); 162extern int rsvp_on; 163extern struct pr_usrreqs rip_usrreqs; 164 165int ip_ctloutput(struct socket *, struct sockopt *sopt); 166void ip_drain(void); 167int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 168 u_long if_hwassist_flags, int sw_csum); 169void ip_freemoptions(struct ip_moptions *); 170void ip_init(void); 171extern int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 172 struct ip_moptions *); 173int ip_output(struct mbuf *, 174 struct mbuf *, struct route *, int, struct ip_moptions *, 175 struct inpcb *); 176struct in_ifaddr * 177 ip_rtaddr(struct in_addr); 178void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 179 struct mbuf *); 180void ip_slowtimo(void); 181struct mbuf * 182 ip_srcroute(void); 183void ip_stripoptions(struct mbuf *, struct mbuf *); 184#ifdef RANDOM_IP_ID 185u_int16_t 186 ip_randomid(void); 187#endif 188int rip_ctloutput(struct socket *, struct sockopt *); 189void rip_ctlinput(int, struct sockaddr *, void *); 190void rip_init(void); 191void rip_input(struct mbuf *, int); 192int rip_output(struct mbuf *, struct socket *, u_long); 193void ipip_input(struct mbuf *, int); 194void rsvp_input(struct mbuf *, int); 195int ip_rsvp_init(struct socket *); 196int ip_rsvp_done(void); 197extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 198extern void (*ip_rsvp_force_done)(struct socket *); 199extern void (*rsvp_input_p)(struct mbuf *m, int off); 200 201/* 202 * Obtain next_hop information asociated with the mbuf; if any. 203 * If a tag is present devalidate it also. 204 */ 205static __inline struct sockaddr_in * 206ip_claim_next_hop(struct mbuf *m) 207{ 208 struct m_tag *mtag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 209 if (mtag) { 210 struct sockaddr_in *sin = *(struct sockaddr_in **)(mtag+1); 211 mtag->m_tag_id = PACKET_TAG_NONE; 212 return sin; 213 } else 214 return NULL; 215} 216 217#ifdef PFIL_HOOKS 218extern struct pfil_head inet_pfil_hook; 219#endif 220 221void in_delayed_cksum(struct mbuf *m); 222 223#endif /* _KERNEL */ 224 225#endif /* !_NETINET_IP_VAR_H_ */ 226