ip_var.h revision 134383
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 * 4. 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: head/sys/netinet/ip_var.h 134383 2004-08-27 15:16:24Z andre $ 31 */ 32 33#ifndef _NETINET_IP_VAR_H_ 34#define _NETINET_IP_VAR_H_ 35 36#include <sys/queue.h> 37 38/* 39 * Overlay for ip header used by other protocols (tcp, udp). 40 */ 41struct ipovly { 42 u_char ih_x1[9]; /* (unused) */ 43 u_char ih_pr; /* protocol */ 44 u_short ih_len; /* protocol length */ 45 struct in_addr ih_src; /* source internet address */ 46 struct in_addr ih_dst; /* destination internet address */ 47}; 48 49#ifdef _KERNEL 50/* 51 * Ip reassembly queue structure. Each fragment 52 * being reassembled is attached to one of these structures. 53 * They are timed out after ipq_ttl drops to 0, and may also 54 * be reclaimed if memory becomes tight. 55 */ 56struct ipq { 57 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */ 58 u_char ipq_ttl; /* time for reass q to live */ 59 u_char ipq_p; /* protocol of this fragment */ 60 u_short ipq_id; /* sequence id for reassembly */ 61 struct mbuf *ipq_frags; /* to ip headers of fragments */ 62 struct in_addr ipq_src,ipq_dst; 63 u_char ipq_nfrags; /* # frags in this packet */ 64 struct label *ipq_label; /* MAC label */ 65}; 66#endif /* _KERNEL */ 67 68/* 69 * Structure stored in mbuf in inpcb.ip_options 70 * and passed to ip_output when ip options are in use. 71 * The actual length of the options (including ipopt_dst) 72 * is in m_len. 73 */ 74#define MAX_IPOPTLEN 40 75 76struct ipoption { 77 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 78 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 79}; 80 81/* 82 * Structure attached to inpcb.ip_moptions and 83 * passed to ip_output when IP multicast options are in use. 84 */ 85struct ip_moptions { 86 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 87 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 88 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 89 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 90 u_short imo_num_memberships; /* no. memberships this socket */ 91 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 92 u_long imo_multicast_vif; /* vif num outgoing multicasts */ 93}; 94 95struct ipstat { 96 u_long ips_total; /* total packets received */ 97 u_long ips_badsum; /* checksum bad */ 98 u_long ips_tooshort; /* packet too short */ 99 u_long ips_toosmall; /* not enough data */ 100 u_long ips_badhlen; /* ip header length < data size */ 101 u_long ips_badlen; /* ip length < ip header length */ 102 u_long ips_fragments; /* fragments received */ 103 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 104 u_long ips_fragtimeout; /* fragments timed out */ 105 u_long ips_forward; /* packets forwarded */ 106 u_long ips_fastforward; /* packets fast forwarded */ 107 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 108 u_long ips_redirectsent; /* packets forwarded on same net */ 109 u_long ips_noproto; /* unknown or unsupported protocol */ 110 u_long ips_delivered; /* datagrams delivered to upper level*/ 111 u_long ips_localout; /* total ip packets generated here */ 112 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 113 u_long ips_reassembled; /* total packets reassembled ok */ 114 u_long ips_fragmented; /* datagrams successfully fragmented */ 115 u_long ips_ofragments; /* output fragments created */ 116 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 117 u_long ips_badoptions; /* error in option processing */ 118 u_long ips_noroute; /* packets discarded due to no route */ 119 u_long ips_badvers; /* ip version != 4 */ 120 u_long ips_rawout; /* total raw ip packets generated */ 121 u_long ips_toolong; /* ip length > max ip packet size */ 122 u_long ips_notmember; /* multicasts for unregistered grps */ 123 u_long ips_nogif; /* no match gif found */ 124 u_long ips_badaddr; /* invalid address on header */ 125}; 126 127#ifdef _KERNEL 128 129/* flags passed to ip_output as last parameter */ 130#define IP_FORWARDING 0x1 /* most of ip header exists */ 131#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 132#define IP_SENDONES 0x4 /* send all-ones broadcast */ 133#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 134#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 135 136/* mbuf flag used by ip_fastfwd */ 137#define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */ 138 139struct ip; 140struct inpcb; 141struct route; 142struct sockopt; 143 144extern struct ipstat ipstat; 145extern u_short ip_id; /* ip packet ctr, for ids */ 146extern int ip_defttl; /* default IP ttl */ 147extern int ipforwarding; /* ip forwarding */ 148extern int ip_doopts; /* process or ignore IP options */ 149#ifdef IPSTEALTH 150extern int ipstealth; /* stealth forwarding */ 151#endif 152extern u_char ip_protox[]; 153extern struct socket *ip_rsvpd; /* reservation protocol daemon */ 154extern struct socket *ip_mrouter; /* multicast routing daemon */ 155extern int (*legal_vif_num)(int); 156extern u_long (*ip_mcast_src)(int); 157extern int rsvp_on; 158extern struct pr_usrreqs rip_usrreqs; 159 160int ip_ctloutput(struct socket *, struct sockopt *sopt); 161void ip_drain(void); 162int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 163 u_long if_hwassist_flags, int sw_csum); 164void ip_freemoptions(struct ip_moptions *); 165void ip_init(void); 166extern int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 167 struct ip_moptions *); 168int ip_output(struct mbuf *, 169 struct mbuf *, struct route *, int, struct ip_moptions *, 170 struct inpcb *); 171struct mbuf * 172 ip_reass(struct mbuf *); 173struct in_ifaddr * 174 ip_rtaddr(struct in_addr); 175void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 176 struct mbuf *); 177void ip_slowtimo(void); 178struct mbuf * 179 ip_srcroute(void); 180void ip_stripoptions(struct mbuf *, struct mbuf *); 181u_int16_t ip_randomid(void); 182int rip_ctloutput(struct socket *, struct sockopt *); 183void rip_ctlinput(int, struct sockaddr *, void *); 184void rip_init(void); 185void rip_input(struct mbuf *, int); 186int rip_output(struct mbuf *, struct socket *, u_long); 187void ipip_input(struct mbuf *, int); 188void rsvp_input(struct mbuf *, int); 189int ip_rsvp_init(struct socket *); 190int ip_rsvp_done(void); 191extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 192extern void (*ip_rsvp_force_done)(struct socket *); 193extern void (*rsvp_input_p)(struct mbuf *m, int off); 194 195extern struct pfil_head inet_pfil_hook; /* packet filter hooks */ 196 197void in_delayed_cksum(struct mbuf *m); 198 199static __inline uint16_t ip_newid(void); 200extern int ip_do_randomid; 201 202static __inline uint16_t 203ip_newid(void) 204{ 205 if (ip_do_randomid) 206 return ip_randomid(); 207 208 return htons(ip_id++); 209} 210 211#endif /* _KERNEL */ 212 213#endif /* !_NETINET_IP_VAR_H_ */ 214