ip_var.h revision 201735
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 201735 2010-01-07 10:39:15Z luigi $ 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}; 97 98struct ipstat { 99 u_long ips_total; /* total packets received */ 100 u_long ips_badsum; /* checksum bad */ 101 u_long ips_tooshort; /* packet too short */ 102 u_long ips_toosmall; /* not enough data */ 103 u_long ips_badhlen; /* ip header length < data size */ 104 u_long ips_badlen; /* ip length < ip header length */ 105 u_long ips_fragments; /* fragments received */ 106 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 107 u_long ips_fragtimeout; /* fragments timed out */ 108 u_long ips_forward; /* packets forwarded */ 109 u_long ips_fastforward; /* packets fast forwarded */ 110 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 111 u_long ips_redirectsent; /* packets forwarded on same net */ 112 u_long ips_noproto; /* unknown or unsupported protocol */ 113 u_long ips_delivered; /* datagrams delivered to upper level*/ 114 u_long ips_localout; /* total ip packets generated here */ 115 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 116 u_long ips_reassembled; /* total packets reassembled ok */ 117 u_long ips_fragmented; /* datagrams successfully fragmented */ 118 u_long ips_ofragments; /* output fragments created */ 119 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 120 u_long ips_badoptions; /* error in option processing */ 121 u_long ips_noroute; /* packets discarded due to no route */ 122 u_long ips_badvers; /* ip version != 4 */ 123 u_long ips_rawout; /* total raw ip packets generated */ 124 u_long ips_toolong; /* ip length > max ip packet size */ 125 u_long ips_notmember; /* multicasts for unregistered grps */ 126 u_long ips_nogif; /* no match gif found */ 127 u_long ips_badaddr; /* invalid address on header */ 128}; 129 130#ifdef _KERNEL 131 132#include <net/vnet.h> 133 134/* 135 * In-kernel consumers can use these accessor macros directly to update 136 * stats. 137 */ 138#define IPSTAT_ADD(name, val) V_ipstat.name += (val) 139#define IPSTAT_SUB(name, val) V_ipstat.name -= (val) 140#define IPSTAT_INC(name) IPSTAT_ADD(name, 1) 141#define IPSTAT_DEC(name) IPSTAT_SUB(name, 1) 142 143/* 144 * Kernel module consumers must use this accessor macro. 145 */ 146void kmod_ipstat_inc(int statnum); 147#define KMOD_IPSTAT_INC(name) \ 148 kmod_ipstat_inc(offsetof(struct ipstat, name) / sizeof(u_long)) 149void kmod_ipstat_dec(int statnum); 150#define KMOD_IPSTAT_DEC(name) \ 151 kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(u_long)) 152 153/* flags passed to ip_output as last parameter */ 154#define IP_FORWARDING 0x1 /* most of ip header exists */ 155#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 156#define IP_SENDONES 0x4 /* send all-ones broadcast */ 157#define IP_SENDTOIF 0x8 /* send on specific ifnet */ 158#define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */ 159#define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */ 160 161/* 162 * mbuf flag used by ip_fastfwd 163 */ 164#define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */ 165 166#ifdef __NO_STRICT_ALIGNMENT 167#define IP_HDR_ALIGNED_P(ip) 1 168#else 169#define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0) 170#endif 171 172struct ip; 173struct inpcb; 174struct route; 175struct sockopt; 176 177VNET_DECLARE(struct ipstat, ipstat); 178VNET_DECLARE(u_short, ip_id); /* ip packet ctr, for ids */ 179VNET_DECLARE(int, ip_defttl); /* default IP ttl */ 180VNET_DECLARE(int, ipforwarding); /* ip forwarding */ 181#ifdef IPSTEALTH 182VNET_DECLARE(int, ipstealth); /* stealth forwarding */ 183#endif 184VNET_DECLARE(int, rsvp_on); 185VNET_DECLARE(struct socket *, ip_rsvpd); /* reservation protocol daemon*/ 186VNET_DECLARE(struct socket *, ip_mrouter); /* multicast routing daemon */ 187 188#define V_ipstat VNET(ipstat) 189#define V_ip_id VNET(ip_id) 190#define V_ip_defttl VNET(ip_defttl) 191#define V_ipforwarding VNET(ipforwarding) 192#ifdef IPSTEALTH 193#define V_ipstealth VNET(ipstealth) 194#endif 195#define V_rsvp_on VNET(rsvp_on) 196#define V_ip_rsvpd VNET(ip_rsvpd) 197#define V_ip_mrouter VNET(ip_mrouter) 198 199extern u_char ip_protox[]; 200extern int (*legal_vif_num)(int); 201extern u_long (*ip_mcast_src)(int); 202extern struct pr_usrreqs rip_usrreqs; 203 204void inp_freemoptions(struct ip_moptions *); 205int inp_getmoptions(struct inpcb *, struct sockopt *); 206int inp_setmoptions(struct inpcb *, struct sockopt *); 207 208int ip_ctloutput(struct socket *, struct sockopt *sopt); 209void ip_drain(void); 210void ip_fini(void *xtp); 211int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 212 u_long if_hwassist_flags, int sw_csum); 213void ip_forward(struct mbuf *m, int srcrt); 214void ip_init(void); 215extern int 216 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 217 struct ip_moptions *); 218int ip_output(struct mbuf *, 219 struct mbuf *, struct route *, int, struct ip_moptions *, 220 struct inpcb *); 221int ipproto_register(u_char); 222int ipproto_unregister(u_char); 223struct mbuf * 224 ip_reass(struct mbuf *); 225struct in_ifaddr * 226 ip_rtaddr(struct in_addr, u_int fibnum); 227void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 228 struct mbuf *); 229void ip_slowtimo(void); 230u_int16_t ip_randomid(void); 231int rip_ctloutput(struct socket *, struct sockopt *); 232void rip_ctlinput(int, struct sockaddr *, void *); 233void rip_init(void); 234#ifdef VIMAGE 235void rip_destroy(void); 236#endif 237void rip_input(struct mbuf *, int); 238int rip_output(struct mbuf *, struct socket *, u_long); 239void ipip_input(struct mbuf *, int); 240void rsvp_input(struct mbuf *, int); 241int ip_rsvp_init(struct socket *); 242int ip_rsvp_done(void); 243extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 244extern void (*ip_rsvp_force_done)(struct socket *); 245extern void (*rsvp_input_p)(struct mbuf *m, int off); 246 247VNET_DECLARE(struct pfil_head, inet_pfil_hook); /* packet filter hooks */ 248#define V_inet_pfil_hook VNET(inet_pfil_hook) 249 250void in_delayed_cksum(struct mbuf *m); 251 252/* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */ 253/* 254 * Reference to an ipfw or packet filter rule that can be carried 255 * outside critical sections. 256 * A rule is identified by rulenum:rule_id which is ordered. 257 * In version chain_id the rule can be found in slot 'slot', so 258 * we don't need a lookup if chain_id == chain->id. 259 * 260 * On exit from the firewall this structure refers to the rule after 261 * the matching one (slot points to the new rule; rulenum:rule_id-1 262 * is the matching rule), and additional info (e.g. info often contains 263 * the insn argument or tablearg in the low 16 bits, in host format). 264 * On entry, the structure is valid if slot>0, and refers to the starting 265 * rules. 'info' contains the reason for reinject, e.g. divert port, 266 * divert direction, and so on. 267 */ 268struct ipfw_rule_ref { 269 uint32_t slot; /* slot for matching rule */ 270 uint32_t rulenum; /* matching rule number */ 271 uint32_t rule_id; /* matching rule id */ 272 uint32_t chain_id; /* ruleset id */ 273 uint32_t info; /* see below */ 274}; 275 276enum { 277 IPFW_INFO_MASK = 0x0000ffff, 278 IPFW_INFO_OUT = 0x00000000, /* outgoing, just for convenience */ 279 IPFW_INFO_IN = 0x80000000, /* incoming, overloads dir */ 280 IPFW_ONEPASS = 0x40000000, /* One-pass, do not reinject */ 281 IPFW_IS_MASK = 0x30000000, /* which source ? */ 282 IPFW_IS_DIVERT = 0x20000000, 283 IPFW_IS_DUMMYNET =0x10000000, 284 IPFW_IS_PIPE = 0x08000000, /* pip1=1, queue = 0 */ 285}; 286#define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */ 287#define MTAG_IPFW_RULE 1262273568 /* rule reference */ 288 289struct ip_fw_args; 290typedef int (*ip_fw_chk_ptr_t)(struct ip_fw_args *args); 291typedef int (*ip_fw_ctl_ptr_t)(struct sockopt *); 292VNET_DECLARE(ip_fw_chk_ptr_t, ip_fw_chk_ptr); 293VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr); 294#define V_ip_fw_chk_ptr VNET(ip_fw_chk_ptr) 295#define V_ip_fw_ctl_ptr VNET(ip_fw_ctl_ptr) 296 297/* Divert hooks. */ 298extern void (*ip_divert_ptr)(struct mbuf *m, int incoming); 299/* ng_ipfw hooks -- XXX make it the same as divert and dummynet */ 300extern int (*ng_ipfw_input_p)(struct mbuf **, int, 301 struct ip_fw_args *, int); 302 303extern int (*ip_dn_ctl_ptr)(struct sockopt *); 304extern int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *); 305 306VNET_DECLARE(int, ip_do_randomid); 307#define V_ip_do_randomid VNET(ip_do_randomid) 308#define ip_newid() ((V_ip_do_randomid != 0) ? ip_randomid() : \ 309 htons(V_ip_id++)) 310 311#endif /* _KERNEL */ 312 313#endif /* !_NETINET_IP_VAR_H_ */ 314