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 * 3. 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: src/sys/netinet/ip_var.h,v 1.50.2.13 2003/08/24 08:24:38 hsu Exp $ 31 */ 32 33 #ifndef _NETINET_IP_VAR_H_ 34 #define _NETINET_IP_VAR_H_ 35 36 #ifndef _SYS_TYPES_H_ 37 #include <sys/types.h> 38 #endif 39 #ifndef _SYS_QUEUE_H_ 40 #include <sys/queue.h> 41 #endif 42 #ifndef _NETINET_IN_H_ 43 #include <netinet/in.h> 44 #endif 45 46 #ifdef _KERNEL 47 48 #include <machine/endian.h> 49 #ifndef _MACHINE_PARAM_H_ 50 #include <machine/param.h> 51 #endif 52 #ifndef _NET_ROUTE_H 53 #include <net/route.h> 54 #endif 55 56 #endif 57 58 /* 59 * Overlay for ip header used by other protocols (tcp, udp). 60 */ 61 struct ipovly { 62 u_char ih_x1[9]; /* (unused) */ 63 u_char ih_pr; /* protocol */ 64 u_short ih_len; /* protocol length */ 65 struct in_addr ih_src; /* source internet address */ 66 struct in_addr ih_dst; /* destination internet address */ 67 }; 68 69 /* 70 * Ip reassembly queue structure. Each fragment 71 * being reassembled is attached to one of these structures. 72 * They are timed out after ipq_ttl drops to 0, and may also 73 * be reclaimed if memory becomes tight. 74 */ 75 struct ipq { 76 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */ 77 u_char ipq_ttl; /* time for reass q to live */ 78 u_char ipq_p; /* protocol of this fragment */ 79 u_short ipq_id; /* sequence id for reassembly */ 80 struct mbuf *ipq_frags; /* to ip headers of fragments */ 81 struct in_addr ipq_src,ipq_dst; 82 u_char ipq_nfrags; /* # frags in this packet */ 83 }; 84 85 /* 86 * Structure stored in mbuf in inpcb.ip_options 87 * and passed to ip_output when ip options are in use. 88 * The actual length of the options (including ipopt_dst) 89 * is in m_len. 90 */ 91 #define MAX_IPOPTLEN 40 92 93 struct ipoption { 94 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 95 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 96 }; 97 98 /* 99 * Structure attached to inpcb.ip_moptions and 100 * passed to ip_output when IP multicast options are in use. 101 */ 102 struct ip_moptions { 103 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 104 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 105 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 106 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 107 u_short imo_num_memberships; /* no. memberships this socket */ 108 u_short imo_max_memberships; /* max memberships this socket */ 109 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 110 u_long imo_multicast_vif; /* vif num outgoing multicasts */ 111 }; 112 113 /* 114 * IP Statistics. 115 * 116 * NOTE: Make sure this struct's size is multiple cache line size. 117 */ 118 struct ip_stats { 119 u_long ips_total; /* total packets received */ 120 u_long ips_badsum; /* checksum bad */ 121 u_long ips_tooshort; /* packet too short */ 122 u_long ips_toosmall; /* not enough data */ 123 u_long ips_badhlen; /* ip header length < data size */ 124 u_long ips_badlen; /* ip length < ip header length */ 125 u_long ips_fragments; /* fragments received */ 126 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 127 u_long ips_fragtimeout; /* fragments timed out */ 128 u_long ips_forward; /* packets forwarded */ 129 u_long ips_fastforward; /* packets fast forwarded */ 130 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 131 u_long ips_redirectsent; /* packets forwarded on same net */ 132 u_long ips_noproto; /* unknown or unsupported protocol */ 133 u_long ips_delivered; /* datagrams delivered to upper level*/ 134 u_long ips_localout; /* total ip packets generated here */ 135 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 136 u_long ips_reassembled; /* total packets reassembled ok */ 137 u_long ips_fragmented; /* datagrams successfully fragmented */ 138 u_long ips_ofragments; /* output fragments created */ 139 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 140 u_long ips_badoptions; /* error in option processing */ 141 u_long ips_noroute; /* packets discarded due to no route */ 142 u_long ips_badvers; /* ip version != 4 */ 143 u_long ips_rawout; /* total raw ip packets generated */ 144 u_long ips_toolong; /* ip length > max ip packet size */ 145 u_long ips_notmember; /* multicasts for unregistered grps */ 146 u_long ips_nogif; /* no match gif found */ 147 u_long ips_badaddr; /* invalid address on header */ 148 u_long ips_pad[3]; /* pad to cache line size (64B) */ 149 }; 150 #ifdef _KERNEL 151 CTASSERT((sizeof(struct ip_stats) & __VM_CACHELINE_MASK) == 0); 152 #endif 153 154 #ifdef _KERNEL 155 156 #define ipstat ipstats_percpu[mycpuid] 157 158 extern struct ip_stats ipstats_percpu[MAXCPU]; 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_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 164 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 165 #define IP_DEBUGROUTE 0x10000 /* debug route */ 166 167 struct ip; 168 struct inpcb; 169 struct route; 170 struct sockopt; 171 struct lwkt_port; 172 struct pktinfo; 173 union netmsg; 174 175 extern u_short ip_id; /* ip packet ctr, for ids */ 176 extern int ip_defttl; /* default IP ttl */ 177 extern int ipforwarding; /* ip forwarding */ 178 extern int ip_porthash_trycount; 179 extern u_char ip_protox[]; 180 extern struct socket *ip_rsvpd; /* reservation protocol daemon */ 181 extern struct socket *ip_mrouter; /* multicast routing daemon */ 182 extern int (*legal_vif_num)(int); 183 extern u_long (*ip_mcast_src)(int); 184 extern int rsvp_on; 185 extern struct pr_usrreqs rip_usrreqs; 186 187 void ip_ctloutput(union netmsg *); 188 void ip_drain(void); 189 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 190 u_long if_hwassist_flags, int sw_csum); 191 struct mbuf * 192 ip_reass(struct mbuf *); 193 void ip_freemoptions(struct ip_moptions *); 194 void ip_init(void); 195 extern int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 196 struct ip_moptions *); 197 198 void ip_hashfn(struct mbuf **, int); 199 void ip_hashcheck(struct mbuf *, const struct pktinfo *); 200 struct mbuf * 201 ip_rehashm(struct mbuf *); 202 void ip_transport_redispatch(struct lwkt_port *, struct mbuf *, int); 203 204 boolean_t 205 ip_lengthcheck(struct mbuf **, int); 206 int ip_output(struct mbuf *, 207 struct mbuf *, struct route *, int, struct ip_moptions *, 208 struct inpcb *); 209 struct in_ifaddr * 210 ip_rtaddr(struct in_addr, struct route *); 211 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 212 struct mbuf *); 213 struct mbuf * 214 ip_srcroute(struct mbuf *); 215 void ip_stripoptions(struct mbuf *); 216 u_int16_t ip_randomid(void); 217 void rip_ctloutput(union netmsg *); 218 void rip_init(void); 219 int rip_input(struct mbuf **, int *, int); 220 int rip_output(struct mbuf *, struct socket *, ...); 221 extern int (*ipip_input)(struct mbuf **, int *, int); 222 int rsvp_input(struct mbuf **, int *, int); 223 int ip_rsvp_init(struct socket *); 224 int ip_rsvp_done(void); 225 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 226 extern void (*ip_rsvp_force_done)(struct socket *); 227 extern int (*rsvp_input_p)(struct mbuf **, int *, int); 228 229 extern struct pfil_head inet_pfil_hook; 230 231 void in_delayed_cksum(struct mbuf *m); 232 233 static __inline uint16_t ip_newid(void); 234 extern int ip_do_randomid; 235 236 static __inline uint16_t 237 ip_newid(void) 238 { 239 if (ip_do_randomid) 240 return ip_randomid(); 241 else 242 return __htons(ip_id++); 243 } 244 245 #endif /* _KERNEL */ 246 247 #endif /* !_NETINET_IP_VAR_H_ */ 248