ip_var.h revision 242161
11849Swollman/*- 21849Swollman * Copyright (c) 1982, 1986, 1993 31849Swollman * The Regents of the University of California. All rights reserved. 41849Swollman * 51849Swollman * Redistribution and use in source and binary forms, with or without 61849Swollman * modification, are permitted provided that the following conditions 71849Swollman * are met: 81849Swollman * 1. Redistributions of source code must retain the above copyright 91849Swollman * notice, this list of conditions and the following disclaimer. 101849Swollman * 2. Redistributions in binary form must reproduce the above copyright 111849Swollman * notice, this list of conditions and the following disclaimer in the 121849Swollman * documentation and/or other materials provided with the distribution. 131849Swollman * 4. Neither the name of the University nor the names of its contributors 141849Swollman * may be used to endorse or promote products derived from this software 151849Swollman * without specific prior written permission. 161849Swollman * 171849Swollman * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181849Swollman * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191849Swollman * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201849Swollman * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211849Swollman * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221849Swollman * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231849Swollman * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241849Swollman * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251849Swollman * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261849Swollman * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271849Swollman * SUCH DAMAGE. 281849Swollman * 291849Swollman * @(#)ip_var.h 8.2 (Berkeley) 1/9/95 301849Swollman * $FreeBSD: head/sys/netinet/ip_var.h 242161 2012-10-26 21:06:33Z glebius $ 311849Swollman */ 325790Sdg 3350476Speter#ifndef _NETINET_IP_VAR_H_ 341849Swollman#define _NETINET_IP_VAR_H_ 351849Swollman 3685437Speter#include <sys/queue.h> 371849Swollman 381849Swollman/* 391849Swollman * Overlay for ip header used by other protocols (tcp, udp). 401849Swollman */ 411849Swollmanstruct ipovly { 421849Swollman u_char ih_x1[9]; /* (unused) */ 431849Swollman u_char ih_pr; /* protocol */ 441849Swollman u_short ih_len; /* protocol length */ 451849Swollman struct in_addr ih_src; /* source internet address */ 461849Swollman struct in_addr ih_dst; /* destination internet address */ 471849Swollman}; 481849Swollman 491849Swollman#ifdef _KERNEL 501849Swollman/* 511849Swollman * Ip reassembly queue structure. Each fragment 521849Swollman * being reassembled is attached to one of these structures. 531849Swollman * They are timed out after ipq_ttl drops to 0, and may also 541849Swollman * be reclaimed if memory becomes tight. 551849Swollman */ 565243Sbdestruct ipq { 575243Sbde TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */ 581849Swollman u_char ipq_ttl; /* time for reass q to live */ 591849Swollman u_char ipq_p; /* protocol of this fragment */ 601849Swollman u_short ipq_id; /* sequence id for reassembly */ 611849Swollman struct mbuf *ipq_frags; /* to ip headers of fragments */ 621849Swollman struct in_addr ipq_src,ipq_dst; 631849Swollman u_char ipq_nfrags; /* # frags in this packet */ 641849Swollman struct label *ipq_label; /* MAC label */ 651849Swollman}; 661849Swollman#endif /* _KERNEL */ 671849Swollman 681849Swollman/* 691849Swollman * Structure stored in mbuf in inpcb.ip_options 701849Swollman * and passed to ip_output when ip options are in use. 711849Swollman * The actual length of the options (including ipopt_dst) 721849Swollman * is in m_len. 731849Swollman */ 741849Swollman#define MAX_IPOPTLEN 40 751849Swollman 761849Swollmanstruct ipoption { 771849Swollman struct in_addr ipopt_dst; /* first-hop dst if source routed */ 781849Swollman char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 795243Sbde}; 805243Sbde 815243Sbde/* 825243Sbde * Structure attached to inpcb.ip_moptions and 835243Sbde * passed to ip_output when IP multicast options are in use. 845243Sbde * This structure is lazy-allocated. 855243Sbde */ 865243Sbdestruct ip_moptions { 875243Sbde struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 885243Sbde struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 895243Sbde u_long imo_multicast_vif; /* vif num outgoing multicasts */ 905243Sbde u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 911849Swollman u_char imo_multicast_loop; /* 1 => hear sends if a member */ 921849Swollman u_short imo_num_memberships; /* no. memberships this socket */ 931849Swollman u_short imo_max_memberships; /* max memberships this socket */ 941849Swollman struct in_multi **imo_membership; /* group memberships */ 951849Swollman struct in_mfilter *imo_mfilters; /* source filters */ 961849Swollman STAILQ_ENTRY(ip_moptions) imo_link; 971849Swollman}; 981849Swollman 991849Swollmanstruct ipstat { 1001849Swollman u_long ips_total; /* total packets received */ 1011849Swollman u_long ips_badsum; /* checksum bad */ 1021849Swollman u_long ips_tooshort; /* packet too short */ 1031849Swollman u_long ips_toosmall; /* not enough data */ 1041849Swollman u_long ips_badhlen; /* ip header length < data size */ 1051849Swollman u_long ips_badlen; /* ip length < ip header length */ 1061849Swollman u_long ips_fragments; /* fragments received */ 1071849Swollman u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 1081849Swollman u_long ips_fragtimeout; /* fragments timed out */ 1091849Swollman u_long ips_forward; /* packets forwarded */ 1101849Swollman u_long ips_fastforward; /* packets fast forwarded */ 1111849Swollman u_long ips_cantforward; /* packets rcvd for unreachable dest */ 1121849Swollman u_long ips_redirectsent; /* packets forwarded on same net */ 1131849Swollman u_long ips_noproto; /* unknown or unsupported protocol */ 1141849Swollman u_long ips_delivered; /* datagrams delivered to upper level*/ 1151849Swollman u_long ips_localout; /* total ip packets generated here */ 1161849Swollman u_long ips_odropped; /* lost packets due to nobufs, etc. */ 1171849Swollman u_long ips_reassembled; /* total packets reassembled ok */ 1181849Swollman u_long ips_fragmented; /* datagrams successfully fragmented */ 1191849Swollman u_long ips_ofragments; /* output fragments created */ 1201849Swollman u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 1211849Swollman u_long ips_badoptions; /* error in option processing */ 1221849Swollman u_long ips_noroute; /* packets discarded due to no route */ 1231849Swollman u_long ips_badvers; /* ip version != 4 */ 1241849Swollman u_long ips_rawout; /* total raw ip packets generated */ 1251849Swollman u_long ips_toolong; /* ip length > max ip packet size */ 1261849Swollman u_long ips_notmember; /* multicasts for unregistered grps */ 1271849Swollman u_long ips_nogif; /* no match gif found */ 1281849Swollman u_long ips_badaddr; /* invalid address on header */ 1291849Swollman}; 1301849Swollman 1311849Swollman#ifdef _KERNEL 1321849Swollman 1331849Swollman#include <net/vnet.h> 1341849Swollman 1351849Swollman/* 1361849Swollman * In-kernel consumers can use these accessor macros directly to update 1371849Swollman * stats. 1381849Swollman */ 1391849Swollman#define IPSTAT_ADD(name, val) V_ipstat.name += (val) 1401849Swollman#define IPSTAT_SUB(name, val) V_ipstat.name -= (val) 1411849Swollman#define IPSTAT_INC(name) IPSTAT_ADD(name, 1) 1421849Swollman#define IPSTAT_DEC(name) IPSTAT_SUB(name, 1) 1431849Swollman 1441849Swollman/* 1451849Swollman * Kernel module consumers must use this accessor macro. 1461849Swollman */ 1471849Swollmanvoid kmod_ipstat_inc(int statnum); 1481849Swollman#define KMOD_IPSTAT_INC(name) \ 1491849Swollman kmod_ipstat_inc(offsetof(struct ipstat, name) / sizeof(u_long)) 1501849Swollmanvoid kmod_ipstat_dec(int statnum); 1511849Swollman#define KMOD_IPSTAT_DEC(name) \ 1521849Swollman kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(u_long)) 1531849Swollman 1541849Swollman/* flags passed to ip_output as last parameter */ 1551849Swollman#define IP_FORWARDING 0x1 /* most of ip header exists */ 1561849Swollman#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 1571849Swollman#define IP_SENDONES 0x4 /* send all-ones broadcast */ 1581849Swollman#define IP_SENDTOIF 0x8 /* send on specific ifnet */ 1591849Swollman#define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */ 1601849Swollman#define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */ 1611849Swollman 1625243Sbde/* 1631849Swollman * mbuf flag used by ip_fastfwd 1641849Swollman */ 1651849Swollman#define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */ 1661849Swollman 1671849Swollman#ifdef __NO_STRICT_ALIGNMENT 1681849Swollman#define IP_HDR_ALIGNED_P(ip) 1 1691849Swollman#else 1701849Swollman#define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0) 171#endif 172 173struct ip; 174struct inpcb; 175struct route; 176struct sockopt; 177 178VNET_DECLARE(struct ipstat, ipstat); 179VNET_DECLARE(u_short, ip_id); /* ip packet ctr, for ids */ 180VNET_DECLARE(int, ip_defttl); /* default IP ttl */ 181VNET_DECLARE(int, ipforwarding); /* ip forwarding */ 182#ifdef IPSTEALTH 183VNET_DECLARE(int, ipstealth); /* stealth forwarding */ 184#endif 185extern u_char ip_protox[]; 186VNET_DECLARE(struct socket *, ip_rsvpd); /* reservation protocol daemon*/ 187VNET_DECLARE(struct socket *, ip_mrouter); /* multicast routing daemon */ 188extern int (*legal_vif_num)(int); 189extern u_long (*ip_mcast_src)(int); 190VNET_DECLARE(int, rsvp_on); 191VNET_DECLARE(int, drop_redirect); 192extern struct pr_usrreqs rip_usrreqs; 193 194#define V_ipstat VNET(ipstat) 195#define V_ip_id VNET(ip_id) 196#define V_ip_defttl VNET(ip_defttl) 197#define V_ipforwarding VNET(ipforwarding) 198#ifdef IPSTEALTH 199#define V_ipstealth VNET(ipstealth) 200#endif 201#define V_ip_rsvpd VNET(ip_rsvpd) 202#define V_ip_mrouter VNET(ip_mrouter) 203#define V_rsvp_on VNET(rsvp_on) 204#define V_drop_redirect VNET(drop_redirect) 205 206void inp_freemoptions(struct ip_moptions *); 207int inp_getmoptions(struct inpcb *, struct sockopt *); 208int inp_setmoptions(struct inpcb *, struct sockopt *); 209 210int ip_ctloutput(struct socket *, struct sockopt *sopt); 211void ip_drain(void); 212int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 213 u_long if_hwassist_flags); 214void ip_forward(struct mbuf *m, int srcrt); 215void ip_init(void); 216#ifdef VIMAGE 217void ip_destroy(void); 218#endif 219extern int 220 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 221 struct ip_moptions *); 222int ip_output(struct mbuf *, 223 struct mbuf *, struct route *, int, struct ip_moptions *, 224 struct inpcb *); 225int ipproto_register(short); 226int ipproto_unregister(short); 227struct mbuf * 228 ip_reass(struct mbuf *); 229struct in_ifaddr * 230 ip_rtaddr(struct in_addr, u_int fibnum); 231void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 232 struct mbuf *); 233void ip_slowtimo(void); 234u_int16_t ip_randomid(void); 235int rip_ctloutput(struct socket *, struct sockopt *); 236void rip_ctlinput(int, struct sockaddr *, void *); 237void rip_init(void); 238#ifdef VIMAGE 239void rip_destroy(void); 240#endif 241void rip_input(struct mbuf *, int); 242int rip_output(struct mbuf *, struct socket *, u_long); 243void ipip_input(struct mbuf *, int); 244void rsvp_input(struct mbuf *, int); 245int ip_rsvp_init(struct socket *); 246int ip_rsvp_done(void); 247extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 248extern void (*ip_rsvp_force_done)(struct socket *); 249extern void (*rsvp_input_p)(struct mbuf *m, int off); 250 251VNET_DECLARE(struct pfil_head, inet_pfil_hook); /* packet filter hooks */ 252#define V_inet_pfil_hook VNET(inet_pfil_hook) 253 254void in_delayed_cksum(struct mbuf *m); 255 256/* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */ 257/* 258 * Reference to an ipfw or packet filter rule that can be carried 259 * outside critical sections. 260 * A rule is identified by rulenum:rule_id which is ordered. 261 * In version chain_id the rule can be found in slot 'slot', so 262 * we don't need a lookup if chain_id == chain->id. 263 * 264 * On exit from the firewall this structure refers to the rule after 265 * the matching one (slot points to the new rule; rulenum:rule_id-1 266 * is the matching rule), and additional info (e.g. info often contains 267 * the insn argument or tablearg in the low 16 bits, in host format). 268 * On entry, the structure is valid if slot>0, and refers to the starting 269 * rules. 'info' contains the reason for reinject, e.g. divert port, 270 * divert direction, and so on. 271 */ 272struct ipfw_rule_ref { 273 uint32_t slot; /* slot for matching rule */ 274 uint32_t rulenum; /* matching rule number */ 275 uint32_t rule_id; /* matching rule id */ 276 uint32_t chain_id; /* ruleset id */ 277 uint32_t info; /* see below */ 278}; 279 280enum { 281 IPFW_INFO_MASK = 0x0000ffff, 282 IPFW_INFO_OUT = 0x00000000, /* outgoing, just for convenience */ 283 IPFW_INFO_IN = 0x80000000, /* incoming, overloads dir */ 284 IPFW_ONEPASS = 0x40000000, /* One-pass, do not reinject */ 285 IPFW_IS_MASK = 0x30000000, /* which source ? */ 286 IPFW_IS_DIVERT = 0x20000000, 287 IPFW_IS_DUMMYNET =0x10000000, 288 IPFW_IS_PIPE = 0x08000000, /* pip1=1, queue = 0 */ 289}; 290#define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */ 291#define MTAG_IPFW_RULE 1262273568 /* rule reference */ 292#define MTAG_IPFW_CALL 1308397630 /* call stack */ 293 294struct ip_fw_args; 295typedef int (*ip_fw_chk_ptr_t)(struct ip_fw_args *args); 296typedef int (*ip_fw_ctl_ptr_t)(struct sockopt *); 297VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr); 298#define V_ip_fw_ctl_ptr VNET(ip_fw_ctl_ptr) 299 300/* Divert hooks. */ 301extern void (*ip_divert_ptr)(struct mbuf *m, int incoming); 302/* ng_ipfw hooks -- XXX make it the same as divert and dummynet */ 303extern int (*ng_ipfw_input_p)(struct mbuf **, int, 304 struct ip_fw_args *, int); 305 306extern int (*ip_dn_ctl_ptr)(struct sockopt *); 307extern int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *); 308 309VNET_DECLARE(int, ip_do_randomid); 310#define V_ip_do_randomid VNET(ip_do_randomid) 311#define ip_newid() ((V_ip_do_randomid != 0) ? ip_randomid() : \ 312 htons(V_ip_id++)) 313 314#endif /* _KERNEL */ 315 316#endif /* !_NETINET_IP_VAR_H_ */ 317