ip_var.h revision 185895
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 185895 2008-12-10 23:12:39Z zec $ 31 */ 32 33#ifndef _NETINET_IP_VAR_H_ 34#define _NETINET_IP_VAR_H_ 35 36#include <sys/queue.h> 37#ifdef _KERNEL 38#include <sys/vimage.h> 39#endif 40 41/* 42 * Overlay for ip header used by other protocols (tcp, udp). 43 */ 44struct ipovly { 45 u_char ih_x1[9]; /* (unused) */ 46 u_char ih_pr; /* protocol */ 47 u_short ih_len; /* protocol length */ 48 struct in_addr ih_src; /* source internet address */ 49 struct in_addr ih_dst; /* destination internet address */ 50}; 51 52#ifdef _KERNEL 53/* 54 * Ip reassembly queue structure. Each fragment 55 * being reassembled is attached to one of these structures. 56 * They are timed out after ipq_ttl drops to 0, and may also 57 * be reclaimed if memory becomes tight. 58 */ 59struct ipq { 60 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */ 61 u_char ipq_ttl; /* time for reass q to live */ 62 u_char ipq_p; /* protocol of this fragment */ 63 u_short ipq_id; /* sequence id for reassembly */ 64 struct mbuf *ipq_frags; /* to ip headers of fragments */ 65 struct in_addr ipq_src,ipq_dst; 66 u_char ipq_nfrags; /* # frags in this packet */ 67 struct label *ipq_label; /* MAC label */ 68}; 69#endif /* _KERNEL */ 70 71/* 72 * Structure stored in mbuf in inpcb.ip_options 73 * and passed to ip_output when ip options are in use. 74 * The actual length of the options (including ipopt_dst) 75 * is in m_len. 76 */ 77#define MAX_IPOPTLEN 40 78 79struct ipoption { 80 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 81 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 82}; 83 84/* 85 * Multicast source list entry. 86 */ 87struct in_msource { 88 TAILQ_ENTRY(in_msource) ims_next; /* next source */ 89 struct sockaddr_storage ims_addr; /* address of this source */ 90}; 91 92/* 93 * Multicast filter descriptor; there is one instance per group membership 94 * on a socket, allocated as an expandable vector hung off ip_moptions. 95 * struct in_multi contains separate IPv4-stack-wide state for IGMPv3. 96 */ 97struct in_mfilter { 98 uint16_t imf_fmode; /* filter mode for this socket/group */ 99 uint16_t imf_nsources; /* # of sources for this socket/group */ 100 TAILQ_HEAD(, in_msource) imf_sources; /* source list */ 101}; 102 103/* 104 * Structure attached to inpcb.ip_moptions and 105 * passed to ip_output when IP multicast options are in use. 106 * This structure is lazy-allocated. 107 */ 108struct ip_moptions { 109 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 110 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 111 u_long imo_multicast_vif; /* vif num outgoing multicasts */ 112 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 113 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 114 u_short imo_num_memberships; /* no. memberships this socket */ 115 u_short imo_max_memberships; /* max memberships this socket */ 116 struct in_multi **imo_membership; /* group memberships */ 117 struct in_mfilter *imo_mfilters; /* source filters */ 118}; 119 120struct ipstat { 121 u_long ips_total; /* total packets received */ 122 u_long ips_badsum; /* checksum bad */ 123 u_long ips_tooshort; /* packet too short */ 124 u_long ips_toosmall; /* not enough data */ 125 u_long ips_badhlen; /* ip header length < data size */ 126 u_long ips_badlen; /* ip length < ip header length */ 127 u_long ips_fragments; /* fragments received */ 128 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 129 u_long ips_fragtimeout; /* fragments timed out */ 130 u_long ips_forward; /* packets forwarded */ 131 u_long ips_fastforward; /* packets fast forwarded */ 132 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 133 u_long ips_redirectsent; /* packets forwarded on same net */ 134 u_long ips_noproto; /* unknown or unsupported protocol */ 135 u_long ips_delivered; /* datagrams delivered to upper level*/ 136 u_long ips_localout; /* total ip packets generated here */ 137 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 138 u_long ips_reassembled; /* total packets reassembled ok */ 139 u_long ips_fragmented; /* datagrams successfully fragmented */ 140 u_long ips_ofragments; /* output fragments created */ 141 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 142 u_long ips_badoptions; /* error in option processing */ 143 u_long ips_noroute; /* packets discarded due to no route */ 144 u_long ips_badvers; /* ip version != 4 */ 145 u_long ips_rawout; /* total raw ip packets generated */ 146 u_long ips_toolong; /* ip length > max ip packet size */ 147 u_long ips_notmember; /* multicasts for unregistered grps */ 148 u_long ips_nogif; /* no match gif found */ 149 u_long ips_badaddr; /* invalid address on header */ 150}; 151 152#ifdef _KERNEL 153 154/* flags passed to ip_output as last parameter */ 155#define IP_FORWARDING 0x1 /* most of ip header exists */ 156#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 157#define IP_SENDONES 0x4 /* send all-ones broadcast */ 158#define IP_SENDTOIF 0x8 /* send on specific ifnet */ 159#define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */ 160#define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */ 161 162/* 163 * mbuf flag used by ip_fastfwd 164 */ 165#define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */ 166 167#ifdef __NO_STRICT_ALIGNMENT 168#define IP_HDR_ALIGNED_P(ip) 1 169#else 170#define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0) 171#endif 172 173struct ip; 174struct inpcb; 175struct route; 176struct sockopt; 177 178extern struct ipstat ipstat; 179extern u_short ip_id; /* ip packet ctr, for ids */ 180extern int ip_do_randomid; 181extern int ip_defttl; /* default IP ttl */ 182extern int ipforwarding; /* ip forwarding */ 183#ifdef IPSTEALTH 184extern int ipstealth; /* stealth forwarding */ 185#endif 186extern u_char ip_protox[]; 187extern struct socket *ip_rsvpd; /* reservation protocol daemon */ 188extern struct socket *ip_mrouter; /* multicast routing daemon */ 189extern int (*legal_vif_num)(int); 190extern u_long (*ip_mcast_src)(int); 191extern int rsvp_on; 192extern struct pr_usrreqs rip_usrreqs; 193 194void inp_freemoptions(struct ip_moptions *); 195int inp_getmoptions(struct inpcb *, struct sockopt *); 196int inp_setmoptions(struct inpcb *, struct sockopt *); 197 198int ip_ctloutput(struct socket *, struct sockopt *sopt); 199void ip_drain(void); 200void ip_fini(void *xtp); 201int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 202 u_long if_hwassist_flags, int sw_csum); 203void ip_forward(struct mbuf *m, int srcrt); 204void ip_init(void); 205extern int 206 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 207 struct ip_moptions *); 208int ip_output(struct mbuf *, 209 struct mbuf *, struct route *, int, struct ip_moptions *, 210 struct inpcb *); 211int ipproto_register(u_char); 212int ipproto_unregister(u_char); 213struct mbuf * 214 ip_reass(struct mbuf *); 215struct in_ifaddr * 216 ip_rtaddr(struct in_addr, u_int fibnum); 217void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 218 struct mbuf *); 219void ip_slowtimo(void); 220u_int16_t ip_randomid(void); 221int rip_ctloutput(struct socket *, struct sockopt *); 222void rip_ctlinput(int, struct sockaddr *, void *); 223void rip_init(void); 224void rip_input(struct mbuf *, int); 225int rip_output(struct mbuf *, struct socket *, u_long); 226void ipip_input(struct mbuf *, int); 227void rsvp_input(struct mbuf *, int); 228int ip_rsvp_init(struct socket *); 229int ip_rsvp_done(void); 230extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 231extern void (*ip_rsvp_force_done)(struct socket *); 232extern void (*rsvp_input_p)(struct mbuf *m, int off); 233 234extern struct pfil_head inet_pfil_hook; /* packet filter hooks */ 235 236void in_delayed_cksum(struct mbuf *m); 237 238#endif /* _KERNEL */ 239 240#endif /* !_NETINET_IP_VAR_H_ */ 241