1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef _NETINET_IP_VAR_H_ 33 #define _NETINET_IP_VAR_H_ 34 35 #include <sys/epoch.h> 36 #include <sys/queue.h> 37 #include <sys/types.h> 38 39 #include <netinet/in.h> 40 41 /* 42 * Overlay for ip header used by other protocols (tcp, udp). 43 */ 44 struct 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 net.inet.ip.fragttl seconds, and may also be 57 * reclaimed if memory becomes tight. 58 */ 59 struct ipq { 60 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */ 61 time_t ipq_expire; /* time_uptime when ipq expires */ 62 u_char ipq_nfrags; /* # frags in this packet */ 63 u_char ipq_p; /* protocol of this fragment */ 64 u_short ipq_id; /* sequence id for reassembly */ 65 int ipq_maxoff; /* total length of packet */ 66 struct mbuf *ipq_frags; /* to ip headers of fragments */ 67 struct in_addr ipq_src,ipq_dst; 68 struct label *ipq_label; /* MAC label */ 69 }; 70 #endif /* _KERNEL */ 71 72 /* 73 * Structure stored in mbuf in inpcb.ip_options 74 * and passed to ip_output when ip options are in use. 75 * The actual length of the options (including ipopt_dst) 76 * is in m_len. 77 */ 78 #define MAX_IPOPTLEN 40 79 80 struct ipoption { 81 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 82 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 83 }; 84 85 #if defined(_NETINET_IN_VAR_H_) && defined(_KERNEL) 86 /* 87 * Structure attached to inpcb.ip_moptions and 88 * passed to ip_output when IP multicast options are in use. 89 * This structure is lazy-allocated. 90 */ 91 struct ip_moptions { 92 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 93 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 94 u_long imo_multicast_vif; /* vif num outgoing multicasts */ 95 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 96 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 97 struct ip_mfilter_head imo_head; /* group membership list */ 98 }; 99 #else 100 struct ip_moptions; 101 #endif 102 103 struct ipstat { 104 uint64_t ips_total; /* total packets received */ 105 uint64_t ips_badsum; /* checksum bad */ 106 uint64_t ips_tooshort; /* packet too short */ 107 uint64_t ips_toosmall; /* not enough data */ 108 uint64_t ips_badhlen; /* ip header length < data size */ 109 uint64_t ips_badlen; /* ip length < ip header length */ 110 uint64_t ips_fragments; /* fragments received */ 111 uint64_t ips_fragdropped; /* frags dropped (dups, out of space) */ 112 uint64_t ips_fragtimeout; /* fragments timed out */ 113 uint64_t ips_forward; /* packets forwarded */ 114 uint64_t ips_fastforward; /* packets fast forwarded */ 115 uint64_t ips_cantforward; /* packets rcvd for unreachable dest */ 116 uint64_t ips_redirectsent; /* packets forwarded on same net */ 117 uint64_t ips_noproto; /* unknown or unsupported protocol */ 118 uint64_t ips_delivered; /* datagrams delivered to upper level*/ 119 uint64_t ips_localout; /* total ip packets generated here */ 120 uint64_t ips_odropped; /* lost packets due to nobufs, etc. */ 121 uint64_t ips_reassembled; /* total packets reassembled ok */ 122 uint64_t ips_fragmented; /* datagrams successfully fragmented */ 123 uint64_t ips_ofragments; /* output fragments created */ 124 uint64_t ips_cantfrag; /* don't fragment flag was set, etc. */ 125 uint64_t ips_badoptions; /* error in option processing */ 126 uint64_t ips_noroute; /* packets discarded due to no route */ 127 uint64_t ips_badvers; /* ip version != 4 */ 128 uint64_t ips_rawout; /* total raw ip packets generated */ 129 uint64_t ips_toolong; /* ip length > max ip packet size */ 130 uint64_t ips_notmember; /* multicasts for unregistered grps */ 131 uint64_t ips_nogif; /* no match gif found */ 132 uint64_t ips_badaddr; /* invalid address on header */ 133 }; 134 135 #ifdef _KERNEL 136 137 #include <sys/counter.h> 138 #include <net/vnet.h> 139 #include <netinet/in_kdtrace.h> 140 141 VNET_PCPUSTAT_DECLARE(struct ipstat, ipstat); 142 /* 143 * In-kernel consumers can use these accessor macros directly to update 144 * stats. 145 */ 146 #define IPSTAT_ADD(name, val) \ 147 do { \ 148 MIB_SDT_PROBE1(ip, count, name, (val)); \ 149 VNET_PCPUSTAT_ADD(struct ipstat, ipstat, name, (val)); \ 150 } while (0) 151 #define IPSTAT_SUB(name, val) IPSTAT_ADD(name, -(val)) 152 #define IPSTAT_INC(name) IPSTAT_ADD(name, 1) 153 #define IPSTAT_DEC(name) IPSTAT_SUB(name, 1) 154 155 /* 156 * Kernel module consumers must use this accessor macro. 157 */ 158 void kmod_ipstat_inc(int statnum); 159 #define KMOD_IPSTAT_INC(name) \ 160 do { \ 161 MIB_SDT_PROBE1(ip, count, name, 1); \ 162 kmod_ipstat_inc( \ 163 offsetof(struct ipstat, name) / sizeof(uint64_t)); \ 164 } while (0) 165 void kmod_ipstat_dec(int statnum); 166 #define KMOD_IPSTAT_DEC(name) \ 167 do { \ 168 MIB_SDT_PROBE1(ip, count, name, -1); \ 169 kmod_ipstat_dec( \ 170 offsetof(struct ipstat, name) / sizeof(uint64_t)); \ 171 } while (0) 172 173 /* flags passed to ip_output as last parameter */ 174 #define IP_FORWARDING 0x1 /* most of ip header exists */ 175 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 176 #define IP_SENDONES 0x4 /* send all-ones broadcast */ 177 #define IP_SENDTOIF 0x8 /* send on specific ifnet */ 178 #define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */ 179 #define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */ 180 #define IP_NODEFAULTFLOWID 0x40 /* Don't set the flowid from inp */ 181 #define IP_NO_SND_TAG_RL 0x80 /* Don't send down the ratelimit tag */ 182 183 #ifdef __NO_STRICT_ALIGNMENT 184 #define IP_HDR_ALIGNED_P(ip) 1 185 #else 186 #define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0) 187 #endif 188 189 struct ip; 190 struct inpcb; 191 struct route; 192 struct sockopt; 193 struct inpcbinfo; 194 195 VNET_DECLARE(int, ip_defttl); /* default IP ttl */ 196 VNET_DECLARE(int, ipforwarding); /* ip forwarding */ 197 VNET_DECLARE(int, ipsendredirects); 198 #ifdef IPSTEALTH 199 VNET_DECLARE(int, ipstealth); /* stealth forwarding */ 200 #endif 201 VNET_DECLARE(struct socket *, ip_rsvpd); /* reservation protocol daemon*/ 202 VNET_DECLARE(struct socket *, ip_mrouter); /* multicast routing daemon */ 203 extern int (*legal_vif_num)(int); 204 extern u_long (*ip_mcast_src)(int); 205 VNET_DECLARE(int, rsvp_on); 206 VNET_DECLARE(int, drop_redirect); 207 208 #define V_ip_id VNET(ip_id) 209 #define V_ip_defttl VNET(ip_defttl) 210 #define V_ipforwarding VNET(ipforwarding) 211 #define V_ipsendredirects VNET(ipsendredirects) 212 #ifdef IPSTEALTH 213 #define V_ipstealth VNET(ipstealth) 214 #endif 215 #define V_ip_rsvpd VNET(ip_rsvpd) 216 #define V_ip_mrouter VNET(ip_mrouter) 217 #define V_rsvp_on VNET(rsvp_on) 218 #define V_drop_redirect VNET(drop_redirect) 219 220 void inp_freemoptions(struct ip_moptions *); 221 int inp_getmoptions(struct inpcb *, struct sockopt *); 222 int inp_setmoptions(struct inpcb *, struct sockopt *); 223 224 int ip_ctloutput(struct socket *, struct sockopt *sopt); 225 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 226 u_long if_hwassist_flags); 227 void ip_forward(struct mbuf *m, int srcrt); 228 extern int 229 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 230 struct ip_moptions *); 231 int ip_output(struct mbuf *, 232 struct mbuf *, struct route *, int, struct ip_moptions *, 233 struct inpcb *); 234 struct mbuf * 235 ip_reass(struct mbuf *); 236 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 237 struct mbuf *); 238 void ip_fillid(struct ip *); 239 int rip_ctloutput(struct socket *, struct sockopt *); 240 int ipip_input(struct mbuf **, int *, int); 241 int rsvp_input(struct mbuf **, int *, int); 242 243 int ip_rsvp_init(struct socket *); 244 int ip_rsvp_done(void); 245 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 246 extern void (*ip_rsvp_force_done)(struct socket *); 247 extern int (*rsvp_input_p)(struct mbuf **, int *, int); 248 249 typedef int ipproto_input_t(struct mbuf **, int *, int); 250 struct icmp; 251 typedef void ipproto_ctlinput_t(struct icmp *); 252 int ipproto_register(uint8_t, ipproto_input_t, ipproto_ctlinput_t); 253 int ipproto_unregister(uint8_t); 254 #define IPPROTO_REGISTER(prot, input, ctl) do { \ 255 int error __diagused; \ 256 error = ipproto_register(prot, input, ctl); \ 257 MPASS(error == 0); \ 258 } while (0) 259 260 ipproto_input_t rip_input; 261 ipproto_ctlinput_t rip_ctlinput; 262 263 VNET_DECLARE(struct pfil_head *, inet_pfil_head); 264 #define V_inet_pfil_head VNET(inet_pfil_head) 265 #define PFIL_INET_NAME "inet" 266 267 VNET_DECLARE(struct pfil_head *, inet_local_pfil_head); 268 #define V_inet_local_pfil_head VNET(inet_local_pfil_head) 269 #define PFIL_INET_LOCAL_NAME "inet-local" 270 271 void in_delayed_cksum(struct mbuf *m); 272 273 /* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */ 274 /* 275 * Reference to an ipfw or packet filter rule that can be carried 276 * outside critical sections. 277 * A rule is identified by rulenum:rule_id which is ordered. 278 * In version chain_id the rule can be found in slot 'slot', so 279 * we don't need a lookup if chain_id == chain->id. 280 * 281 * On exit from the firewall this structure refers to the rule after 282 * the matching one (slot points to the new rule; rulenum:rule_id-1 283 * is the matching rule), and additional info (e.g. info often contains 284 * the insn argument or tablearg in the low 16 bits, in host format). 285 * On entry, the structure is valid if slot>0, and refers to the starting 286 * rules. 'info' contains the reason for reinject, e.g. divert port, 287 * divert direction, and so on. 288 * 289 * Packet Mark is an analogue to ipfw tags with O(1) lookup from mbuf while 290 * regular tags require a single-linked list traversal. Mark is a 32-bit 291 * number that can be looked up in a table [with 'number' table-type], matched 292 * or compared with a number with optional mask applied before comparison. 293 * Having generic nature, Mark can be used in a variety of needs. 294 * For example, it could be used as a security group: mark will hold a 295 * security group id and represent a group of packet flows that shares same 296 * access control policy. 297 * O_MASK opcode can match mark value bitwise so one can build a hierarchical 298 * model designating different meanings for a bit range(s). 299 */ 300 struct ipfw_rule_ref { 301 /* struct m_tag spans 24 bytes above this point, see mbuf_tags(9) */ 302 /* spare space just to be save in case struct m_tag grows */ 303 /* -- 32 bytes -- */ 304 uint32_t slot; /* slot for matching rule */ 305 uint32_t rulenum; /* matching rule number */ 306 uint32_t rule_id; /* matching rule id */ 307 uint32_t chain_id; /* ruleset id */ 308 uint32_t info; /* see below */ 309 uint32_t pkt_mark; /* packet mark */ 310 uint32_t spare[2]; 311 /* -- 64 bytes -- */ 312 }; 313 314 enum { 315 IPFW_INFO_MASK = 0x0000ffff, 316 IPFW_INFO_OUT = 0x00000000, /* outgoing, just for convenience */ 317 IPFW_INFO_IN = 0x80000000, /* incoming, overloads dir */ 318 IPFW_ONEPASS = 0x40000000, /* One-pass, do not reinject */ 319 IPFW_IS_MASK = 0x30000000, /* which source ? */ 320 IPFW_IS_DIVERT = 0x20000000, 321 IPFW_IS_DUMMYNET =0x10000000, 322 IPFW_IS_PIPE = 0x08000000, /* pipe=1, queue = 0 */ 323 }; 324 #define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */ 325 #define MTAG_IPFW_RULE 1262273568 /* rule reference */ 326 #define MTAG_IPFW_CALL 1308397630 /* call stack */ 327 328 struct ip_fw_args; 329 typedef int (*ip_fw_ctl_ptr_t)(struct sockopt *); 330 VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr); 331 #define V_ip_fw_ctl_ptr VNET(ip_fw_ctl_ptr) 332 333 /* Divert hooks. */ 334 extern void (*ip_divert_ptr)(struct mbuf *m, bool incoming); 335 /* ng_ipfw hooks -- XXX make it the same as divert and dummynet */ 336 extern int (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool); 337 extern int (*ip_dn_ctl_ptr)(struct sockopt *); 338 extern int (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *); 339 340 /* pf specific mtag for divert(4) support */ 341 __enum_uint8_decl(pf_mtag_dir) { 342 PF_DIVERT_MTAG_DIR_IN = 1, 343 PF_DIVERT_MTAG_DIR_OUT = 2 344 }; 345 struct pf_divert_mtag { 346 __enum_uint8(pf_mtag_dir) idir; /* initial pkt direction */ 347 union { 348 __enum_uint8(pf_mtag_dir) ndir; /* new dir after re-enter */ 349 uint16_t port; /* initial divert(4) port */ 350 }; 351 }; 352 #define MTAG_PF_DIVERT 1262273569 353 354 #endif /* _KERNEL */ 355 356 #endif /* !_NETINET_IP_VAR_H_ */ 357