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 } __packed; 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 struct ipstat { 86 uint64_t ips_total; /* total packets received */ 87 uint64_t ips_badsum; /* checksum bad */ 88 uint64_t ips_tooshort; /* packet too short */ 89 uint64_t ips_toosmall; /* not enough data */ 90 uint64_t ips_badhlen; /* ip header length < data size */ 91 uint64_t ips_badlen; /* ip length < ip header length */ 92 uint64_t ips_fragments; /* fragments received */ 93 uint64_t ips_fragdropped; /* frags dropped (dups, out of space) */ 94 uint64_t ips_fragtimeout; /* fragments timed out */ 95 uint64_t ips_forward; /* packets forwarded */ 96 uint64_t ips_fastforward; /* packets fast forwarded */ 97 uint64_t ips_cantforward; /* packets rcvd for unreachable dest */ 98 uint64_t ips_redirectsent; /* packets forwarded on same net */ 99 uint64_t ips_noproto; /* unknown or unsupported protocol */ 100 uint64_t ips_delivered; /* datagrams delivered to upper level*/ 101 uint64_t ips_localout; /* total ip packets generated here */ 102 uint64_t ips_odropped; /* lost packets due to nobufs, etc. */ 103 uint64_t ips_reassembled; /* total packets reassembled ok */ 104 uint64_t ips_fragmented; /* datagrams successfully fragmented */ 105 uint64_t ips_ofragments; /* output fragments created */ 106 uint64_t ips_cantfrag; /* don't fragment flag was set, etc. */ 107 uint64_t ips_badoptions; /* error in option processing */ 108 uint64_t ips_noroute; /* packets discarded due to no route */ 109 uint64_t ips_badvers; /* ip version != 4 */ 110 uint64_t ips_rawout; /* total raw ip packets generated */ 111 uint64_t ips_toolong; /* ip length > max ip packet size */ 112 uint64_t ips_notmember; /* multicasts for unregistered grps */ 113 uint64_t ips_nogif; /* no match gif found */ 114 uint64_t ips_badaddr; /* invalid address on header */ 115 }; 116 117 #ifdef _KERNEL 118 119 #include <sys/counter.h> 120 #include <net/vnet.h> 121 #include <netinet/in_kdtrace.h> 122 123 VNET_PCPUSTAT_DECLARE(struct ipstat, ipstat); 124 /* 125 * In-kernel consumers can use these accessor macros directly to update 126 * stats. 127 */ 128 #define IPSTAT_ADD(name, val) \ 129 do { \ 130 MIB_SDT_PROBE1(ip, count, name, (val)); \ 131 VNET_PCPUSTAT_ADD(struct ipstat, ipstat, name, (val)); \ 132 } while (0) 133 #define IPSTAT_SUB(name, val) IPSTAT_ADD(name, -(val)) 134 #define IPSTAT_INC(name) IPSTAT_ADD(name, 1) 135 #define IPSTAT_DEC(name) IPSTAT_SUB(name, 1) 136 137 /* 138 * Kernel module consumers must use this accessor macro. 139 */ 140 void kmod_ipstat_inc(int statnum); 141 #define KMOD_IPSTAT_INC(name) \ 142 do { \ 143 MIB_SDT_PROBE1(ip, count, name, 1); \ 144 kmod_ipstat_inc( \ 145 offsetof(struct ipstat, name) / sizeof(uint64_t)); \ 146 } while (0) 147 void kmod_ipstat_dec(int statnum); 148 #define KMOD_IPSTAT_DEC(name) \ 149 do { \ 150 MIB_SDT_PROBE1(ip, count, name, -1); \ 151 kmod_ipstat_dec( \ 152 offsetof(struct ipstat, name) / sizeof(uint64_t)); \ 153 } while (0) 154 155 /* flags passed to ip_output as last parameter */ 156 #define IP_FORWARDING 0x1 /* most of ip header exists */ 157 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 158 #define IP_SENDONES 0x4 /* send all-ones broadcast */ 159 #define IP_SENDTOIF 0x8 /* send on specific ifnet */ 160 #define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */ 161 #define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */ 162 #define IP_NODEFAULTFLOWID 0x40 /* Don't set the flowid from inp */ 163 #define IP_NO_SND_TAG_RL 0x80 /* Don't send down the ratelimit tag */ 164 165 #ifdef __NO_STRICT_ALIGNMENT 166 #define IP_HDR_ALIGNED_P(ip) 1 167 #else 168 #define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0) 169 #endif 170 171 struct ip; 172 struct inpcb; 173 struct route; 174 struct sockopt; 175 struct inpcbinfo; 176 struct ip_moptions; 177 178 VNET_DECLARE(int, ip_defttl); /* default IP ttl */ 179 VNET_DECLARE(int, ipforwarding); /* ip forwarding */ 180 VNET_DECLARE(int, ipsendredirects); 181 #ifdef IPSTEALTH 182 VNET_DECLARE(int, ipstealth); /* stealth forwarding */ 183 #endif 184 VNET_DECLARE(struct socket *, ip_rsvpd); /* reservation protocol daemon*/ 185 VNET_DECLARE(int, rsvp_on); 186 VNET_DECLARE(int, drop_redirect); 187 VNET_DECLARE(int, ip_random_id); 188 189 #define V_ip_id VNET(ip_id) 190 #define V_ip_defttl VNET(ip_defttl) 191 #define V_ipforwarding VNET(ipforwarding) 192 #define V_ipsendredirects VNET(ipsendredirects) 193 #ifdef IPSTEALTH 194 #define V_ipstealth VNET(ipstealth) 195 #endif 196 #define V_ip_rsvpd VNET(ip_rsvpd) 197 #define V_rsvp_on VNET(rsvp_on) 198 #define V_drop_redirect VNET(drop_redirect) 199 #define V_ip_random_id VNET(ip_random_id) 200 201 void inp_freemoptions(struct ip_moptions *); 202 int inp_getmoptions(struct inpcb *, struct sockopt *); 203 int inp_setmoptions(struct inpcb *, struct sockopt *); 204 205 int ip_ctloutput(struct socket *, struct sockopt *sopt); 206 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 207 u_long if_hwassist_flags); 208 void ip_forward(struct mbuf *m, int srcrt); 209 int ip_output(struct mbuf *, 210 struct mbuf *, struct route *, int, struct ip_moptions *, 211 struct inpcb *); 212 struct mbuf * 213 ip_reass(struct mbuf *); 214 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 215 struct mbuf *); 216 void ip_fillid(struct ip *, bool); 217 int rip_ctloutput(struct socket *, struct sockopt *); 218 int ipip_input(struct mbuf **, int *, int); 219 int rsvp_input(struct mbuf **, int *, int); 220 221 int ip_rsvp_init(struct socket *); 222 int ip_rsvp_done(void); 223 224 typedef int ipproto_input_t(struct mbuf **, int *, int); 225 struct icmp; 226 typedef void ipproto_ctlinput_t(struct icmp *); 227 int ipproto_register(uint8_t, ipproto_input_t, ipproto_ctlinput_t); 228 int ipproto_unregister(uint8_t); 229 #define IPPROTO_REGISTER(prot, input, ctl) do { \ 230 int error __diagused; \ 231 error = ipproto_register(prot, input, ctl); \ 232 MPASS(error == 0); \ 233 } while (0) 234 235 ipproto_input_t rip_input; 236 ipproto_ctlinput_t rip_ctlinput; 237 238 VNET_DECLARE(struct pfil_head *, inet_pfil_head); 239 #define V_inet_pfil_head VNET(inet_pfil_head) 240 #define PFIL_INET_NAME "inet" 241 242 VNET_DECLARE(struct pfil_head *, inet_local_pfil_head); 243 #define V_inet_local_pfil_head VNET(inet_local_pfil_head) 244 #define PFIL_INET_LOCAL_NAME "inet-local" 245 246 void in_delayed_cksum(struct mbuf *m); 247 void in_delayed_cksum_o(struct mbuf *m, uint16_t o); 248 249 /* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */ 250 /* 251 * Reference to an ipfw or packet filter rule that can be carried 252 * outside critical sections. 253 * A rule is identified by rulenum:rule_id which is ordered. 254 * In version chain_id the rule can be found in slot 'slot', so 255 * we don't need a lookup if chain_id == chain->id. 256 * 257 * On exit from the firewall this structure refers to the rule after 258 * the matching one (slot points to the new rule; rulenum:rule_id-1 259 * is the matching rule), and additional info (e.g. info often contains 260 * the insn argument or tablearg in the low 16 bits, in host format). 261 * On entry, the structure is valid if slot>0, and refers to the starting 262 * rules. 'info' contains the reason for reinject, e.g. divert port, 263 * divert direction, and so on. 264 * 265 * Packet Mark is an analogue to ipfw tags with O(1) lookup from mbuf while 266 * regular tags require a single-linked list traversal. Mark is a 32-bit 267 * number that can be looked up in a table [with 'number' table-type], matched 268 * or compared with a number with optional mask applied before comparison. 269 * Having generic nature, Mark can be used in a variety of needs. 270 * For example, it could be used as a security group: mark will hold a 271 * security group id and represent a group of packet flows that shares same 272 * access control policy. 273 * O_MASK opcode can match mark value bitwise so one can build a hierarchical 274 * model designating different meanings for a bit range(s). 275 */ 276 struct ipfw_rule_ref { 277 /* struct m_tag spans 24 bytes above this point, see mbuf_tags(9) */ 278 /* spare space just to be save in case struct m_tag grows */ 279 /* -- 32 bytes -- */ 280 uint32_t slot; /* slot for matching rule */ 281 uint32_t rulenum; /* matching rule number */ 282 uint32_t rule_id; /* matching rule id */ 283 uint32_t chain_id; /* ruleset id */ 284 uint32_t info; /* see below */ 285 uint32_t pkt_mark; /* packet mark */ 286 uint32_t spare[2]; 287 /* -- 64 bytes -- */ 288 }; 289 290 enum { 291 IPFW_INFO_MASK = 0x0000ffff, 292 IPFW_INFO_OUT = 0x00000000, /* outgoing, just for convenience */ 293 IPFW_INFO_IN = 0x80000000, /* incoming, overloads dir */ 294 IPFW_ONEPASS = 0x40000000, /* One-pass, do not reinject */ 295 IPFW_IS_MASK = 0x30000000, /* which source ? */ 296 IPFW_IS_DIVERT = 0x20000000, 297 IPFW_IS_DUMMYNET =0x10000000, 298 IPFW_IS_PIPE = 0x08000000, /* pipe=1, queue = 0 */ 299 }; 300 #define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */ 301 #define MTAG_IPFW_RULE 1262273568 /* rule reference */ 302 #define MTAG_IPFW_CALL 1308397630 /* call stack */ 303 304 struct ip_fw_args; 305 typedef int (*ip_fw_ctl_ptr_t)(struct sockopt *); 306 VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr); 307 #define V_ip_fw_ctl_ptr VNET(ip_fw_ctl_ptr) 308 309 /* Divert hooks. */ 310 extern void (*ip_divert_ptr)(struct mbuf *m, uint64_t id, bool incoming); 311 /* ng_ipfw hooks -- XXX make it the same as divert and dummynet */ 312 extern int (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool); 313 extern int (*ip_dn_ctl_ptr)(struct sockopt *); 314 extern int (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *); 315 316 /* pf specific mtag for divert(4) support */ 317 __enum_uint8_decl(pf_mtag_dir) { 318 PF_DIVERT_MTAG_DIR_IN = 1, 319 PF_DIVERT_MTAG_DIR_OUT = 2 320 }; 321 struct pf_divert_mtag { 322 __enum_uint8(pf_mtag_dir) idir; /* initial pkt direction */ 323 union { 324 __enum_uint8(pf_mtag_dir) ndir; /* new dir after re-enter */ 325 uint16_t port; /* initial divert(4) port */ 326 }; 327 }; 328 #define MTAG_PF_DIVERT 1262273569 329 330 #endif /* _KERNEL */ 331 332 #endif /* !_NETINET_IP_VAR_H_ */ 333