ip_var.h revision 249276
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 249276 2013-04-08 19:57:21Z glebius $ 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 * This structure is lazy-allocated. 85 */ 86struct ip_moptions { 87 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 88 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 89 u_long imo_multicast_vif; /* vif num outgoing multicasts */ 90 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 91 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 92 u_short imo_num_memberships; /* no. memberships this socket */ 93 u_short imo_max_memberships; /* max memberships this socket */ 94 struct in_multi **imo_membership; /* group memberships */ 95 struct in_mfilter *imo_mfilters; /* source filters */ 96 STAILQ_ENTRY(ip_moptions) imo_link; 97}; 98 99struct ipstat { 100 uint64_t ips_total; /* total packets received */ 101 uint64_t ips_badsum; /* checksum bad */ 102 uint64_t ips_tooshort; /* packet too short */ 103 uint64_t ips_toosmall; /* not enough data */ 104 uint64_t ips_badhlen; /* ip header length < data size */ 105 uint64_t ips_badlen; /* ip length < ip header length */ 106 uint64_t ips_fragments; /* fragments received */ 107 uint64_t ips_fragdropped; /* frags dropped (dups, out of space) */ 108 uint64_t ips_fragtimeout; /* fragments timed out */ 109 uint64_t ips_forward; /* packets forwarded */ 110 uint64_t ips_fastforward; /* packets fast forwarded */ 111 uint64_t ips_cantforward; /* packets rcvd for unreachable dest */ 112 uint64_t ips_redirectsent; /* packets forwarded on same net */ 113 uint64_t ips_noproto; /* unknown or unsupported protocol */ 114 uint64_t ips_delivered; /* datagrams delivered to upper level*/ 115 uint64_t ips_localout; /* total ip packets generated here */ 116 uint64_t ips_odropped; /* lost packets due to nobufs, etc. */ 117 uint64_t ips_reassembled; /* total packets reassembled ok */ 118 uint64_t ips_fragmented; /* datagrams successfully fragmented */ 119 uint64_t ips_ofragments; /* output fragments created */ 120 uint64_t ips_cantfrag; /* don't fragment flag was set, etc. */ 121 uint64_t ips_badoptions; /* error in option processing */ 122 uint64_t ips_noroute; /* packets discarded due to no route */ 123 uint64_t ips_badvers; /* ip version != 4 */ 124 uint64_t ips_rawout; /* total raw ip packets generated */ 125 uint64_t ips_toolong; /* ip length > max ip packet size */ 126 uint64_t ips_notmember; /* multicasts for unregistered grps */ 127 uint64_t ips_nogif; /* no match gif found */ 128 uint64_t ips_badaddr; /* invalid address on header */ 129}; 130 131#ifdef _KERNEL 132 133#include <sys/counter.h> 134#include <net/vnet.h> 135 136/* Should match 'struct ipstat' above. */ 137struct ipstat_p { 138 counter_u64_t ips_total; 139 counter_u64_t ips_badsum; 140 counter_u64_t ips_tooshort; 141 counter_u64_t ips_toosmall; 142 counter_u64_t ips_badhlen; 143 counter_u64_t ips_badlen; 144 counter_u64_t ips_fragments; 145 counter_u64_t ips_fragdropped; 146 counter_u64_t ips_fragtimeout; 147 counter_u64_t ips_forward; 148 counter_u64_t ips_fastforward; 149 counter_u64_t ips_cantforward; 150 counter_u64_t ips_redirectsent; 151 counter_u64_t ips_noproto; 152 counter_u64_t ips_delivered; 153 counter_u64_t ips_localout; 154 counter_u64_t ips_odropped; 155 counter_u64_t ips_reassembled; 156 counter_u64_t ips_fragmented; 157 counter_u64_t ips_ofragments; 158 counter_u64_t ips_cantfrag; 159 counter_u64_t ips_badoptions; 160 counter_u64_t ips_noroute; 161 counter_u64_t ips_badvers; 162 counter_u64_t ips_rawout; 163 counter_u64_t ips_toolong; 164 counter_u64_t ips_notmember; 165 counter_u64_t ips_nogif; 166 counter_u64_t ips_badaddr; 167}; 168VNET_DECLARE(struct ipstat_p, ipstatp); 169#define V_ipstatp VNET(ipstatp) 170 171/* 172 * In-kernel consumers can use these accessor macros directly to update 173 * stats. 174 */ 175#define IPSTAT_ADD(name, val) counter_u64_add(V_ipstatp.name, (val)) 176#define IPSTAT_SUB(name, val) counter_u64_subtract(V_ipstatp.name, (val)) 177#define IPSTAT_INC(name) IPSTAT_ADD(name, 1) 178#define IPSTAT_DEC(name) IPSTAT_ADD(name, -1) 179 180/* 181 * Kernel module consumers must use this accessor macro. 182 */ 183void kmod_ipstat_inc(int statnum); 184#define KMOD_IPSTAT_INC(name) \ 185 kmod_ipstat_inc(offsetof(struct ipstat_p, name) / sizeof(counter_u64_t)) 186void kmod_ipstat_dec(int statnum); 187#define KMOD_IPSTAT_DEC(name) \ 188 kmod_ipstat_dec(offsetof(struct ipstat_p, name) / sizeof(counter_u64_t)) 189 190/* flags passed to ip_output as last parameter */ 191#define IP_FORWARDING 0x1 /* most of ip header exists */ 192#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 193#define IP_SENDONES 0x4 /* send all-ones broadcast */ 194#define IP_SENDTOIF 0x8 /* send on specific ifnet */ 195#define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */ 196#define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */ 197 198/* 199 * mbuf flag used by ip_fastfwd 200 */ 201#define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */ 202#define M_IP_NEXTHOP M_PROTO2 /* explicit ip nexthop */ 203 204#ifdef __NO_STRICT_ALIGNMENT 205#define IP_HDR_ALIGNED_P(ip) 1 206#else 207#define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0) 208#endif 209 210struct ip; 211struct inpcb; 212struct route; 213struct sockopt; 214 215VNET_DECLARE(u_short, ip_id); /* ip packet ctr, for ids */ 216VNET_DECLARE(int, ip_defttl); /* default IP ttl */ 217VNET_DECLARE(int, ipforwarding); /* ip forwarding */ 218#ifdef IPSTEALTH 219VNET_DECLARE(int, ipstealth); /* stealth forwarding */ 220#endif 221extern u_char ip_protox[]; 222VNET_DECLARE(struct socket *, ip_rsvpd); /* reservation protocol daemon*/ 223VNET_DECLARE(struct socket *, ip_mrouter); /* multicast routing daemon */ 224extern int (*legal_vif_num)(int); 225extern u_long (*ip_mcast_src)(int); 226VNET_DECLARE(int, rsvp_on); 227VNET_DECLARE(int, drop_redirect); 228extern struct pr_usrreqs rip_usrreqs; 229 230#define V_ip_id VNET(ip_id) 231#define V_ip_defttl VNET(ip_defttl) 232#define V_ipforwarding VNET(ipforwarding) 233#ifdef IPSTEALTH 234#define V_ipstealth VNET(ipstealth) 235#endif 236#define V_ip_rsvpd VNET(ip_rsvpd) 237#define V_ip_mrouter VNET(ip_mrouter) 238#define V_rsvp_on VNET(rsvp_on) 239#define V_drop_redirect VNET(drop_redirect) 240 241void inp_freemoptions(struct ip_moptions *); 242int inp_getmoptions(struct inpcb *, struct sockopt *); 243int inp_setmoptions(struct inpcb *, struct sockopt *); 244 245int ip_ctloutput(struct socket *, struct sockopt *sopt); 246void ip_drain(void); 247int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 248 u_long if_hwassist_flags); 249void ip_forward(struct mbuf *m, int srcrt); 250void ip_init(void); 251#ifdef VIMAGE 252void ip_destroy(void); 253#endif 254extern int 255 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 256 struct ip_moptions *); 257int ip_output(struct mbuf *, 258 struct mbuf *, struct route *, int, struct ip_moptions *, 259 struct inpcb *); 260int ipproto_register(short); 261int ipproto_unregister(short); 262struct mbuf * 263 ip_reass(struct mbuf *); 264struct in_ifaddr * 265 ip_rtaddr(struct in_addr, u_int fibnum); 266void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 267 struct mbuf *); 268void ip_slowtimo(void); 269u_int16_t ip_randomid(void); 270int rip_ctloutput(struct socket *, struct sockopt *); 271void rip_ctlinput(int, struct sockaddr *, void *); 272void rip_init(void); 273#ifdef VIMAGE 274void rip_destroy(void); 275#endif 276void rip_input(struct mbuf *, int); 277int rip_output(struct mbuf *, struct socket *, u_long); 278void ipip_input(struct mbuf *, int); 279void rsvp_input(struct mbuf *, int); 280int ip_rsvp_init(struct socket *); 281int ip_rsvp_done(void); 282extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 283extern void (*ip_rsvp_force_done)(struct socket *); 284extern void (*rsvp_input_p)(struct mbuf *m, int off); 285 286VNET_DECLARE(struct pfil_head, inet_pfil_hook); /* packet filter hooks */ 287#define V_inet_pfil_hook VNET(inet_pfil_hook) 288 289void in_delayed_cksum(struct mbuf *m); 290 291/* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */ 292/* 293 * Reference to an ipfw or packet filter rule that can be carried 294 * outside critical sections. 295 * A rule is identified by rulenum:rule_id which is ordered. 296 * In version chain_id the rule can be found in slot 'slot', so 297 * we don't need a lookup if chain_id == chain->id. 298 * 299 * On exit from the firewall this structure refers to the rule after 300 * the matching one (slot points to the new rule; rulenum:rule_id-1 301 * is the matching rule), and additional info (e.g. info often contains 302 * the insn argument or tablearg in the low 16 bits, in host format). 303 * On entry, the structure is valid if slot>0, and refers to the starting 304 * rules. 'info' contains the reason for reinject, e.g. divert port, 305 * divert direction, and so on. 306 */ 307struct ipfw_rule_ref { 308 uint32_t slot; /* slot for matching rule */ 309 uint32_t rulenum; /* matching rule number */ 310 uint32_t rule_id; /* matching rule id */ 311 uint32_t chain_id; /* ruleset id */ 312 uint32_t info; /* see below */ 313}; 314 315enum { 316 IPFW_INFO_MASK = 0x0000ffff, 317 IPFW_INFO_OUT = 0x00000000, /* outgoing, just for convenience */ 318 IPFW_INFO_IN = 0x80000000, /* incoming, overloads dir */ 319 IPFW_ONEPASS = 0x40000000, /* One-pass, do not reinject */ 320 IPFW_IS_MASK = 0x30000000, /* which source ? */ 321 IPFW_IS_DIVERT = 0x20000000, 322 IPFW_IS_DUMMYNET =0x10000000, 323 IPFW_IS_PIPE = 0x08000000, /* pip1=1, queue = 0 */ 324}; 325#define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */ 326#define MTAG_IPFW_RULE 1262273568 /* rule reference */ 327#define MTAG_IPFW_CALL 1308397630 /* call stack */ 328 329struct ip_fw_args; 330typedef int (*ip_fw_chk_ptr_t)(struct ip_fw_args *args); 331typedef int (*ip_fw_ctl_ptr_t)(struct sockopt *); 332VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr); 333#define V_ip_fw_ctl_ptr VNET(ip_fw_ctl_ptr) 334 335/* Divert hooks. */ 336extern void (*ip_divert_ptr)(struct mbuf *m, int incoming); 337/* ng_ipfw hooks -- XXX make it the same as divert and dummynet */ 338extern int (*ng_ipfw_input_p)(struct mbuf **, int, 339 struct ip_fw_args *, int); 340 341extern int (*ip_dn_ctl_ptr)(struct sockopt *); 342extern int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *); 343 344VNET_DECLARE(int, ip_do_randomid); 345#define V_ip_do_randomid VNET(ip_do_randomid) 346#define ip_newid() ((V_ip_do_randomid != 0) ? ip_randomid() : \ 347 htons(V_ip_id++)) 348 349#endif /* _KERNEL */ 350 351#endif /* !_NETINET_IP_VAR_H_ */ 352