ip_var.h revision 178888
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 178888 2008-05-09 23:03:00Z julian $ 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 * Multicast source list entry. 83 */ 84struct in_msource { 85 TAILQ_ENTRY(in_msource) ims_next; /* next source */ 86 struct sockaddr_storage ims_addr; /* address of this source */ 87}; 88 89/* 90 * Multicast filter descriptor; there is one instance per group membership 91 * on a socket, allocated as an expandable vector hung off ip_moptions. 92 * struct in_multi contains separate IPv4-stack-wide state for IGMPv3. 93 */ 94struct in_mfilter { 95 uint16_t imf_fmode; /* filter mode for this socket/group */ 96 uint16_t imf_nsources; /* # of sources for this socket/group */ 97 TAILQ_HEAD(, in_msource) imf_sources; /* source list */ 98}; 99 100/* 101 * Structure attached to inpcb.ip_moptions and 102 * passed to ip_output when IP multicast options are in use. 103 * This structure is lazy-allocated. 104 */ 105struct ip_moptions { 106 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 107 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 108 u_long imo_multicast_vif; /* vif num outgoing multicasts */ 109 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 110 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 111 u_short imo_num_memberships; /* no. memberships this socket */ 112 u_short imo_max_memberships; /* max memberships this socket */ 113 struct in_multi **imo_membership; /* group memberships */ 114 struct in_mfilter *imo_mfilters; /* source filters */ 115}; 116 117struct ipstat { 118 u_long ips_total; /* total packets received */ 119 u_long ips_badsum; /* checksum bad */ 120 u_long ips_tooshort; /* packet too short */ 121 u_long ips_toosmall; /* not enough data */ 122 u_long ips_badhlen; /* ip header length < data size */ 123 u_long ips_badlen; /* ip length < ip header length */ 124 u_long ips_fragments; /* fragments received */ 125 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 126 u_long ips_fragtimeout; /* fragments timed out */ 127 u_long ips_forward; /* packets forwarded */ 128 u_long ips_fastforward; /* packets fast forwarded */ 129 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 130 u_long ips_redirectsent; /* packets forwarded on same net */ 131 u_long ips_noproto; /* unknown or unsupported protocol */ 132 u_long ips_delivered; /* datagrams delivered to upper level*/ 133 u_long ips_localout; /* total ip packets generated here */ 134 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 135 u_long ips_reassembled; /* total packets reassembled ok */ 136 u_long ips_fragmented; /* datagrams successfully fragmented */ 137 u_long ips_ofragments; /* output fragments created */ 138 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 139 u_long ips_badoptions; /* error in option processing */ 140 u_long ips_noroute; /* packets discarded due to no route */ 141 u_long ips_badvers; /* ip version != 4 */ 142 u_long ips_rawout; /* total raw ip packets generated */ 143 u_long ips_toolong; /* ip length > max ip packet size */ 144 u_long ips_notmember; /* multicasts for unregistered grps */ 145 u_long ips_nogif; /* no match gif found */ 146 u_long ips_badaddr; /* invalid address on header */ 147}; 148 149#ifdef _KERNEL 150 151/* flags passed to ip_output as last parameter */ 152#define IP_FORWARDING 0x1 /* most of ip header exists */ 153#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 154#define IP_SENDONES 0x4 /* send all-ones broadcast */ 155#define IP_SENDTOIF 0x8 /* send on specific ifnet */ 156#define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */ 157#define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */ 158 159/* 160 * mbuf flag used by ip_fastfwd 161 */ 162#define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */ 163 164#ifdef __NO_STRICT_ALIGNMENT 165#define IP_HDR_ALIGNED_P(ip) 1 166#else 167#define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0) 168#endif 169 170struct ip; 171struct inpcb; 172struct route; 173struct sockopt; 174 175extern struct ipstat ipstat; 176extern u_short ip_id; /* ip packet ctr, for ids */ 177extern int ip_defttl; /* default IP ttl */ 178extern int ipforwarding; /* ip forwarding */ 179#ifdef IPSTEALTH 180extern int ipstealth; /* stealth forwarding */ 181#endif 182extern u_char ip_protox[]; 183extern struct socket *ip_rsvpd; /* reservation protocol daemon */ 184extern struct socket *ip_mrouter; /* multicast routing daemon */ 185extern int (*legal_vif_num)(int); 186extern u_long (*ip_mcast_src)(int); 187extern int rsvp_on; 188extern struct pr_usrreqs rip_usrreqs; 189 190void inp_freemoptions(struct ip_moptions *); 191int inp_getmoptions(struct inpcb *, struct sockopt *); 192int inp_setmoptions(struct inpcb *, struct sockopt *); 193 194int ip_ctloutput(struct socket *, struct sockopt *sopt); 195void ip_drain(void); 196void ip_fini(void *xtp); 197int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 198 u_long if_hwassist_flags, int sw_csum); 199void ip_forward(struct mbuf *m, int srcrt); 200void ip_init(void); 201extern int 202 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 203 struct ip_moptions *); 204int ip_output(struct mbuf *, 205 struct mbuf *, struct route *, int, struct ip_moptions *, 206 struct inpcb *); 207int ipproto_register(u_char); 208int ipproto_unregister(u_char); 209struct mbuf * 210 ip_reass(struct mbuf *); 211struct in_ifaddr * 212 ip_rtaddr(struct in_addr, u_int fibnum); 213void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 214 struct mbuf *); 215void ip_slowtimo(void); 216u_int16_t ip_randomid(void); 217int rip_ctloutput(struct socket *, struct sockopt *); 218void rip_ctlinput(int, struct sockaddr *, void *); 219void rip_init(void); 220void rip_input(struct mbuf *, int); 221int rip_output(struct mbuf *, struct socket *, u_long); 222void ipip_input(struct mbuf *, int); 223void rsvp_input(struct mbuf *, int); 224int ip_rsvp_init(struct socket *); 225int ip_rsvp_done(void); 226extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 227extern void (*ip_rsvp_force_done)(struct socket *); 228extern void (*rsvp_input_p)(struct mbuf *m, int off); 229 230extern struct pfil_head inet_pfil_hook; /* packet filter hooks */ 231 232void in_delayed_cksum(struct mbuf *m); 233 234static __inline uint16_t ip_newid(void); 235extern int ip_do_randomid; 236 237static __inline uint16_t 238ip_newid(void) 239{ 240 if (ip_do_randomid) 241 return ip_randomid(); 242 243 return htons(ip_id++); 244} 245 246#endif /* _KERNEL */ 247 248#endif /* !_NETINET_IP_VAR_H_ */ 249