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 * @(#)ip_var.h 8.2 (Berkeley) 1/9/95 32 */ 33 34 #ifndef _NETINET_IP_VAR_H_ 35 #define _NETINET_IP_VAR_H_ 36 37 #include <sys/queue.h> 38 #include <sys/epoch.h> 39 40 /* 41 * Overlay for ip header used by other protocols (tcp, udp). 42 */ 43 struct ipovly { 44 u_char ih_x1[9]; /* (unused) */ 45 u_char ih_pr; /* protocol */ 46 u_short ih_len; /* protocol length */ 47 struct in_addr ih_src; /* source internet address */ 48 struct in_addr ih_dst; /* destination internet address */ 49 }; 50 51 #ifdef _KERNEL 52 /* 53 * Ip reassembly queue structure. Each fragment 54 * being reassembled is attached to one of these structures. 55 * They are timed out after ipq_ttl drops to 0, and may also 56 * be reclaimed if memory becomes tight. 57 */ 58 struct ipq { 59 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */ 60 u_char ipq_ttl; /* time for reass q to live */ 61 u_char ipq_p; /* protocol of this fragment */ 62 u_short ipq_id; /* sequence id for reassembly */ 63 int ipq_maxoff; /* total length of packet */ 64 struct mbuf *ipq_frags; /* to ip headers of fragments */ 65 struct in_addr ipq_src,ipq_dst; 66 u_char ipq_nfrags; /* # frags in this packet */ 67 struct label *ipq_label; /* MAC label */ 68 }; 69 #endif /* _KERNEL */ 70 71 /* 72 * Structure stored in mbuf in inpcb.ip_options 73 * and passed to ip_output when ip options are in use. 74 * The actual length of the options (including ipopt_dst) 75 * is in m_len. 76 */ 77 #define MAX_IPOPTLEN 40 78 79 struct ipoption { 80 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 81 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 82 }; 83 84 #if defined(_NETINET_IN_VAR_H_) && defined(_KERNEL) 85 /* 86 * Structure attached to inpcb.ip_moptions and 87 * passed to ip_output when IP multicast options are in use. 88 * This structure is lazy-allocated. 89 */ 90 struct ip_moptions { 91 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 92 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 93 u_long imo_multicast_vif; /* vif num outgoing multicasts */ 94 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 95 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 96 struct ip_mfilter_head imo_head; /* group membership list */ 97 }; 98 #else 99 struct ip_moptions; 100 #endif 101 102 struct ipstat { 103 uint64_t ips_total; /* total packets received */ 104 uint64_t ips_badsum; /* checksum bad */ 105 uint64_t ips_tooshort; /* packet too short */ 106 uint64_t ips_toosmall; /* not enough data */ 107 uint64_t ips_badhlen; /* ip header length < data size */ 108 uint64_t ips_badlen; /* ip length < ip header length */ 109 uint64_t ips_fragments; /* fragments received */ 110 uint64_t ips_fragdropped; /* frags dropped (dups, out of space) */ 111 uint64_t ips_fragtimeout; /* fragments timed out */ 112 uint64_t ips_forward; /* packets forwarded */ 113 uint64_t ips_fastforward; /* packets fast forwarded */ 114 uint64_t ips_cantforward; /* packets rcvd for unreachable dest */ 115 uint64_t ips_redirectsent; /* packets forwarded on same net */ 116 uint64_t ips_noproto; /* unknown or unsupported protocol */ 117 uint64_t ips_delivered; /* datagrams delivered to upper level*/ 118 uint64_t ips_localout; /* total ip packets generated here */ 119 uint64_t ips_odropped; /* lost packets due to nobufs, etc. */ 120 uint64_t ips_reassembled; /* total packets reassembled ok */ 121 uint64_t ips_fragmented; /* datagrams successfully fragmented */ 122 uint64_t ips_ofragments; /* output fragments created */ 123 uint64_t ips_cantfrag; /* don't fragment flag was set, etc. */ 124 uint64_t ips_badoptions; /* error in option processing */ 125 uint64_t ips_noroute; /* packets discarded due to no route */ 126 uint64_t ips_badvers; /* ip version != 4 */ 127 uint64_t ips_rawout; /* total raw ip packets generated */ 128 uint64_t ips_toolong; /* ip length > max ip packet size */ 129 uint64_t ips_notmember; /* multicasts for unregistered grps */ 130 uint64_t ips_nogif; /* no match gif found */ 131 uint64_t ips_badaddr; /* invalid address on header */ 132 }; 133 134 #ifdef _KERNEL 135 136 #include <sys/counter.h> 137 #include <net/vnet.h> 138 139 VNET_PCPUSTAT_DECLARE(struct ipstat, ipstat); 140 /* 141 * In-kernel consumers can use these accessor macros directly to update 142 * stats. 143 */ 144 #define IPSTAT_ADD(name, val) \ 145 VNET_PCPUSTAT_ADD(struct ipstat, ipstat, name, (val)) 146 #define IPSTAT_SUB(name, val) IPSTAT_ADD(name, -(val)) 147 #define IPSTAT_INC(name) IPSTAT_ADD(name, 1) 148 #define IPSTAT_DEC(name) IPSTAT_SUB(name, 1) 149 150 /* 151 * Kernel module consumers must use this accessor macro. 152 */ 153 void kmod_ipstat_inc(int statnum); 154 #define KMOD_IPSTAT_INC(name) \ 155 kmod_ipstat_inc(offsetof(struct ipstat, name) / sizeof(uint64_t)) 156 void kmod_ipstat_dec(int statnum); 157 #define KMOD_IPSTAT_DEC(name) \ 158 kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(uint64_t)) 159 160 /* flags passed to ip_output as last parameter */ 161 #define IP_FORWARDING 0x1 /* most of ip header exists */ 162 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 163 #define IP_SENDONES 0x4 /* send all-ones broadcast */ 164 #define IP_SENDTOIF 0x8 /* send on specific ifnet */ 165 #define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */ 166 #define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */ 167 #define IP_NODEFAULTFLOWID 0x40 /* Don't set the flowid from inp */ 168 #define IP_NO_SND_TAG_RL 0x80 /* Don't send down the ratelimit tag */ 169 170 #ifdef __NO_STRICT_ALIGNMENT 171 #define IP_HDR_ALIGNED_P(ip) 1 172 #else 173 #define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0) 174 #endif 175 176 struct ip; 177 struct inpcb; 178 struct route; 179 struct sockopt; 180 struct inpcbinfo; 181 182 VNET_DECLARE(int, ip_defttl); /* default IP ttl */ 183 VNET_DECLARE(int, ipforwarding); /* ip forwarding */ 184 VNET_DECLARE(int, ipsendredirects); 185 #ifdef IPSTEALTH 186 VNET_DECLARE(int, ipstealth); /* stealth forwarding */ 187 #endif 188 extern u_char ip_protox[]; 189 VNET_DECLARE(struct socket *, ip_rsvpd); /* reservation protocol daemon*/ 190 VNET_DECLARE(struct socket *, ip_mrouter); /* multicast routing daemon */ 191 extern int (*legal_vif_num)(int); 192 extern u_long (*ip_mcast_src)(int); 193 VNET_DECLARE(int, rsvp_on); 194 VNET_DECLARE(int, drop_redirect); 195 extern struct pr_usrreqs rip_usrreqs; 196 197 #define V_ip_id VNET(ip_id) 198 #define V_ip_defttl VNET(ip_defttl) 199 #define V_ipforwarding VNET(ipforwarding) 200 #define V_ipsendredirects VNET(ipsendredirects) 201 #ifdef IPSTEALTH 202 #define V_ipstealth VNET(ipstealth) 203 #endif 204 #define V_ip_rsvpd VNET(ip_rsvpd) 205 #define V_ip_mrouter VNET(ip_mrouter) 206 #define V_rsvp_on VNET(rsvp_on) 207 #define V_drop_redirect VNET(drop_redirect) 208 209 void inp_freemoptions(struct ip_moptions *); 210 int inp_getmoptions(struct inpcb *, struct sockopt *); 211 int inp_setmoptions(struct inpcb *, struct sockopt *); 212 213 int ip_ctloutput(struct socket *, struct sockopt *sopt); 214 void ip_drain(void); 215 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 216 u_long if_hwassist_flags); 217 void ip_forward(struct mbuf *m, int srcrt); 218 void ip_init(void); 219 extern int 220 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 221 struct ip_moptions *); 222 int ip_output(struct mbuf *, 223 struct mbuf *, struct route *, int, struct ip_moptions *, 224 struct inpcb *); 225 int ipproto_register(short); 226 int ipproto_unregister(short); 227 struct mbuf * 228 ip_reass(struct mbuf *); 229 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 230 struct mbuf *); 231 void ip_slowtimo(void); 232 void ip_fillid(struct ip *); 233 int rip_ctloutput(struct socket *, struct sockopt *); 234 void rip_ctlinput(int, struct sockaddr *, void *); 235 void rip_init(void); 236 int rip_input(struct mbuf **, int *, int); 237 int rip_output(struct mbuf *, struct socket *, ...); 238 int ipip_input(struct mbuf **, int *, int); 239 int rsvp_input(struct mbuf **, int *, int); 240 int ip_rsvp_init(struct socket *); 241 int ip_rsvp_done(void); 242 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 243 extern void (*ip_rsvp_force_done)(struct socket *); 244 extern int (*rsvp_input_p)(struct mbuf **, int *, int); 245 246 VNET_DECLARE(struct pfil_head *, inet_pfil_head); 247 #define V_inet_pfil_head VNET(inet_pfil_head) 248 #define PFIL_INET_NAME "inet" 249 250 VNET_DECLARE(struct pfil_head *, inet_local_pfil_head); 251 #define V_inet_local_pfil_head VNET(inet_local_pfil_head) 252 #define PFIL_INET_LOCAL_NAME "inet-local" 253 254 void 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 */ 272 struct 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 }; 279 280 enum { 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, /* pipe=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 */ 293 294 struct ip_fw_args; 295 typedef int (*ip_fw_chk_ptr_t)(struct ip_fw_args *args); 296 typedef int (*ip_fw_ctl_ptr_t)(struct sockopt *); 297 VNET_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. */ 301 extern void (*ip_divert_ptr)(struct mbuf *m, bool incoming); 302 /* ng_ipfw hooks -- XXX make it the same as divert and dummynet */ 303 extern int (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool); 304 extern int (*ip_dn_ctl_ptr)(struct sockopt *); 305 extern int (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *); 306 #endif /* _KERNEL */ 307 308 #endif /* !_NETINET_IP_VAR_H_ */ 309