ip_input.c revision 37433
1141104Sharti/* 21590Srgrimes * Copyright (c) 1982, 1986, 1988, 1993 31590Srgrimes * The Regents of the University of California. All rights reserved. 41590Srgrimes * 51590Srgrimes * Redistribution and use in source and binary forms, with or without 61590Srgrimes * modification, are permitted provided that the following conditions 71590Srgrimes * are met: 81590Srgrimes * 1. Redistributions of source code must retain the above copyright 91590Srgrimes * notice, this list of conditions and the following disclaimer. 101590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111590Srgrimes * notice, this list of conditions and the following disclaimer in the 121590Srgrimes * documentation and/or other materials provided with the distribution. 131590Srgrimes * 3. All advertising materials mentioning features or use of this software 141590Srgrimes * must display the following acknowledgement: 151590Srgrimes * This product includes software developed by the University of 161590Srgrimes * California, Berkeley and its contributors. 171590Srgrimes * 4. Neither the name of the University nor the names of its contributors 181590Srgrimes * may be used to endorse or promote products derived from this software 191590Srgrimes * without specific prior written permission. 201590Srgrimes * 211590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311590Srgrimes * SUCH DAMAGE. 321590Srgrimes * 331590Srgrimes * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 341590Srgrimes * $Id: ip_input.c,v 1.93 1998/07/06 05:00:52 julian Exp $ 351590Srgrimes * $ANA: ip_input.c,v 1.5 1996/09/18 14:34:59 wollman Exp $ 361590Srgrimes */ 3762833Swsanchez 3862833Swsanchez#define _IP_VHL 391590Srgrimes 401590Srgrimes#include "opt_bootp.h" 4162833Swsanchez#include "opt_ipfw.h" 4294587Sobrien#include "opt_ipdivert.h" 431590Srgrimes#include "opt_ipfilter.h" 441590Srgrimes 451590Srgrimes#include <stddef.h> 461590Srgrimes 471590Srgrimes#include <sys/param.h> 481590Srgrimes#include <sys/systm.h> 491590Srgrimes#include <sys/mbuf.h> 501590Srgrimes#include <sys/domain.h> 511590Srgrimes#include <sys/protosw.h> 521590Srgrimes#include <sys/socket.h> 531590Srgrimes#include <sys/time.h> 541590Srgrimes#include <sys/kernel.h> 55144026Sharti#include <sys/syslog.h> 56144026Sharti#include <sys/sysctl.h> 57144026Sharti 58144026Sharti#include <net/if.h> 591590Srgrimes#include <net/if_var.h> 60144026Sharti#include <net/if_dl.h> 61144026Sharti#include <net/route.h> 62144026Sharti#include <net/netisr.h> 63144026Sharti 64144026Sharti#include <netinet/in.h> 651590Srgrimes#include <netinet/in_systm.h> 66144026Sharti#include <netinet/in_var.h> 67144026Sharti#include <netinet/ip.h> 68144026Sharti#include <netinet/in_pcb.h> 69144026Sharti#include <netinet/ip_var.h> 70144026Sharti#include <netinet/ip_icmp.h> 711590Srgrimes#include <machine/in_cksum.h> 721590Srgrimes 73144341Sharti#include <sys/socketvar.h> 74141104Sharti 751590Srgrimes#ifdef IPFIREWALL 76141104Sharti#include <netinet/ip_fw.h> 77141104Sharti#endif 7827644Scharnier 79141104Shartiint rsvp_on = 0; 80141104Shartistatic int ip_rsvp_on; 81141104Shartistruct socket *ip_rsvpd; 82141104Sharti 83141104Shartiint ipforwarding = 0; 841590SrgrimesSYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW, 85145612Sharti &ipforwarding, 0, ""); 86141104Sharti 87141104Shartistatic int ipsendredirects = 1; /* XXX */ 88141104ShartiSYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW, 891590Srgrimes &ipsendredirects, 0, ""); 90141104Sharti 91141104Shartiint ip_defttl = IPDEFTTL; 92141104ShartiSYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW, 931590Srgrimes &ip_defttl, 0, ""); 94141104Sharti 95141104Shartistatic int ip_dosourceroute = 0; 96141104ShartiSYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW, 97141104Sharti &ip_dosourceroute, 0, ""); 98141104Sharti 991590Srgrimesstatic int ip_acceptsourceroute = 0; 1001590SrgrimesSYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute, 101144341Sharti CTLFLAG_RW, &ip_acceptsourceroute, 0, ""); 1021590Srgrimes#ifdef DIAGNOSTIC 1031590Srgrimesstatic int ipprintfs = 0; 1041590Srgrimes#endif 1051590Srgrimes 1061590Srgrimesextern struct domain inetdomain; 107138916Shartiextern struct protosw inetsw[]; 108138916Shartiu_char ip_protox[IPPROTO_MAX]; 109138916Shartistatic int ipqmaxlen = IFQ_MAXLEN; 110138916Shartistruct in_ifaddrhead in_ifaddrhead; /* first inet address */ 111144026Shartistruct ifqueue ipintrq; 112144026ShartiSYSCTL_INT(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, CTLFLAG_RD, 1131590Srgrimes &ipintrq.ifq_maxlen, 0, ""); 114144026ShartiSYSCTL_INT(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, CTLFLAG_RD, 1151590Srgrimes &ipintrq.ifq_drops, 0, ""); 116144026Sharti 117144026Shartistruct ipstat ipstat; 118144026ShartiSYSCTL_STRUCT(_net_inet_ip, IPCTL_STATS, stats, CTLFLAG_RD, 119144026Sharti &ipstat, ipstat, ""); 120144026Sharti 121126824Sru/* Packet reassembly stuff */ 122144341Sharti#define IPREASS_NHASH_LOG2 6 123144341Sharti#define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2) 124144341Sharti#define IPREASS_HMASK (IPREASS_NHASH - 1) 125144341Sharti#define IPREASS_HASH(x,y) \ 126144341Sharti ((((x) & 0xF | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK) 127144341Sharti 128144341Shartistatic struct ipq ipq[IPREASS_NHASH]; 129144341Shartistatic int nipq = 0; /* total # of reass queues */ 130144341Shartistatic int maxnipq; 131144341Sharti 132144341Sharti#ifdef IPCTL_DEFMTU 133144026ShartiSYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 134138916Sharti &ip_mtu, 0, ""); 135144341Sharti#endif 1361590Srgrimes 137144341Sharti#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 138144341Sharti#undef COMPAT_IPFW 139144341Sharti#define COMPAT_IPFW 1 140138916Sharti#else 141144020Sharti#undef COMPAT_IPFW 142138916Sharti#endif 143138916Sharti 144144020Sharti#ifdef COMPAT_IPFW 145138916Sharti/* Firewall hooks */ 146144026Shartiip_fw_chk_t *ip_fw_chk_ptr; 1471590Srgrimesip_fw_ctl_t *ip_fw_ctl_ptr; 1481590Srgrimes 1491590Srgrimes/* IP Network Address Translation (NAT) hooks */ 1501590Srgrimesip_nat_t *ip_nat_ptr; 1511590Srgrimesip_nat_ctl_t *ip_nat_ctl_ptr; 1521590Srgrimes#endif 153144026Sharti 154144026Sharti#if defined(IPFILTER_LKM) || defined(IPFILTER) 155144026Shartiint iplattach __P((void)); 156144026Shartiint (*fr_checkp) __P((struct ip *, int, struct ifnet *, int, struct mbuf **)) = NULL; 157144026Sharti#endif 158144026Sharti 159144026Sharti 160144026Sharti/* 161144026Sharti * We need to save the IP options in case a protocol wants to respond 162144026Sharti * to an incoming packet over the same route if the packet got here 163144026Sharti * using IP source routing. This allows connection establishment and 164144026Sharti * maintenance when the remote end is on a network that is not known 165144026Sharti * to us. 166144026Sharti */ 167144026Shartistatic int ip_nhops = 0; 168144026Shartistatic struct ip_srcrt { 169144026Sharti struct in_addr dst; /* final destination */ 170144026Sharti char nop; /* one NOP to align */ 171144026Sharti char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 172144026Sharti struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 173144026Sharti} ip_srcrt; 174144026Sharti 175144026Sharti#ifdef IPDIVERT 176144026Sharti/* 177144026Sharti * Shared variable between ip_input() and ip_reass() to communicate 1781590Srgrimes * about which packets, once assembled from fragments, get diverted, 1791590Srgrimes * and to which port. 1801590Srgrimes */ 18118730Sstevestatic u_short frag_divert_port; 1821590Srgrimes#endif 1831590Srgrimes 18469527Swillstruct sockaddr_in *ip_fw_fwd_addr; 1851590Srgrimes 1861590Srgrimesstatic void save_rte __P((u_char *, struct in_addr)); 187144026Shartistatic void ip_deq __P((struct ipasfrag *)); 1881590Srgrimesstatic int ip_dooptions __P((struct mbuf *)); 1891590Srgrimesstatic void ip_enq __P((struct ipasfrag *, struct ipasfrag *)); 1901590Srgrimesstatic void ip_forward __P((struct mbuf *, int)); 1911590Srgrimesstatic void ip_freef __P((struct ipq *)); 1921590Srgrimesstatic struct ip * 1931590Srgrimes ip_reass __P((struct ipasfrag *, struct ipq *, struct ipq *)); 1941590Srgrimesstatic struct in_ifaddr * 1951590Srgrimes ip_rtaddr __P((struct in_addr)); 196145616Shartistatic void ipintr __P((void)); 197144026Sharti/* 198144026Sharti * IP initialization: fill in IP protocol switch table. 199144026Sharti * All protocols not implemented in kernel go to raw IP protocol handler. 2001590Srgrimes */ 201145616Shartivoid 202144026Shartiip_init() 203144026Sharti{ 204144026Sharti register struct protosw *pr; 205144026Sharti register int i; 206144026Sharti 207144026Sharti TAILQ_INIT(&in_ifaddrhead); 208144026Sharti pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 209144026Sharti if (pr == 0) 210144026Sharti panic("ip_init"); 211144026Sharti for (i = 0; i < IPPROTO_MAX; i++) 212144026Sharti ip_protox[i] = pr - inetsw; 213144026Sharti for (pr = inetdomain.dom_protosw; 214144026Sharti pr < inetdomain.dom_protoswNPROTOSW; pr++) 215144026Sharti if (pr->pr_domain->dom_family == PF_INET && 216144026Sharti pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 217144026Sharti ip_protox[pr->pr_protocol] = pr - inetsw; 218144026Sharti 219144026Sharti for (i = 0; i < IPREASS_NHASH; i++) 220144026Sharti ipq[i].next = ipq[i].prev = &ipq[i]; 221144026Sharti 222144026Sharti maxnipq = nmbclusters/4; 223144026Sharti 224144026Sharti ip_id = time_second & 0xffff; 225144026Sharti ipintrq.ifq_maxlen = ipqmaxlen; 226144026Sharti#ifdef IPFIREWALL 227144026Sharti ip_fw_init(); 228144026Sharti#endif 229144026Sharti#ifdef IPNAT 230144026Sharti ip_nat_init(); 231144026Sharti#endif 232144026Sharti#ifdef IPFILTER 233144026Sharti iplattach(); 234145616Sharti#endif 2351590Srgrimes 236145616Sharti} 2371590Srgrimes 238144894Shartistatic struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; 239144894Shartistatic struct route ipforward_rt; 240144894Sharti 241144894Sharti/* 242144894Sharti * Ip input routine. Checksum and byte swap header. If fragmented 243144894Sharti * try to reassemble. Process options. Pass to next level. 244144894Sharti */ 245144894Shartivoid 246144894Shartiip_input(struct mbuf *m) 247144894Sharti{ 248144894Sharti struct ip *ip; 249144894Sharti struct ipq *fp; 250145612Sharti struct in_ifaddr *ia; 251144894Sharti int i, hlen; 252144894Sharti u_short sum; 253144894Sharti 254144894Sharti#ifdef DIAGNOSTIC 255144894Sharti if (m == NULL || (m->m_flags & M_PKTHDR) == 0) 256144894Sharti panic("ip_input no HDR"); 257144894Sharti#endif 258144894Sharti /* 259144894Sharti * If no IP addresses have been set yet but the interfaces 260144894Sharti * are receiving, can't do anything with incoming packets yet. 261144894Sharti * XXX This is broken! We should be able to receive broadcasts 262144894Sharti * and multicasts even without any local addresses configured. 263144894Sharti */ 264144894Sharti if (TAILQ_EMPTY(&in_ifaddrhead)) 265144894Sharti goto bad; 266144894Sharti ipstat.ips_total++; 267144894Sharti 268144894Sharti if (m->m_pkthdr.len < sizeof(struct ip)) 269145612Sharti goto tooshort; 270144894Sharti 271144894Sharti if (m->m_len < sizeof (struct ip) && 272144894Sharti (m = m_pullup(m, sizeof (struct ip))) == 0) { 2731590Srgrimes ipstat.ips_toosmall++; 274145616Sharti return; 2751590Srgrimes } 2761590Srgrimes ip = mtod(m, struct ip *); 2771590Srgrimes 278145616Sharti if (IP_VHL_V(ip->ip_vhl) != IPVERSION) { 2791590Srgrimes ipstat.ips_badvers++; 280145616Sharti goto bad; 281145616Sharti } 2821590Srgrimes 283145616Sharti hlen = IP_VHL_HL(ip->ip_vhl) << 2; 2848874Srgrimes if (hlen < sizeof(struct ip)) { /* minimum header length */ 285145616Sharti ipstat.ips_badhlen++; 286145616Sharti goto bad; 287145616Sharti } 288145616Sharti if (hlen > m->m_len) { 289145616Sharti if ((m = m_pullup(m, hlen)) == 0) { 2901590Srgrimes ipstat.ips_badhlen++; 2911590Srgrimes return; 2921590Srgrimes } 2931590Srgrimes ip = mtod(m, struct ip *); 2941590Srgrimes } 2951590Srgrimes if (hlen == sizeof(struct ip)) { 2961590Srgrimes sum = in_cksum_hdr(ip); 2971590Srgrimes } else { 2981590Srgrimes sum = in_cksum(m, hlen); 2991590Srgrimes } 3001590Srgrimes if (sum) { 3011590Srgrimes ipstat.ips_badsum++; 3021590Srgrimes goto bad; 3031590Srgrimes } 3041590Srgrimes 3051590Srgrimes /* 30698136Sjmallett * Convert fields to host representation. 3071590Srgrimes */ 3081590Srgrimes NTOHS(ip->ip_len); 30993056Simp if (ip->ip_len < hlen) { 3101590Srgrimes ipstat.ips_badlen++; 311144745Sharti goto bad; 312144745Sharti } 313144745Sharti NTOHS(ip->ip_id); 3141590Srgrimes NTOHS(ip->ip_off); 315138232Sharti 316138232Sharti /* 3171590Srgrimes * Check that the amount of data in the buffers 318138232Sharti * is as at least much as the IP header would have us expect. 319138232Sharti * Trim mbufs if longer than we expect. 3201590Srgrimes * Drop packet if shorter than we expect. 3211590Srgrimes */ 3221590Srgrimes if (m->m_pkthdr.len < ip->ip_len) { 3231590Srgrimestooshort: 324144341Sharti ipstat.ips_tooshort++; 325144341Sharti goto bad; 326144341Sharti } 327144341Sharti if (m->m_pkthdr.len > ip->ip_len) { 328144341Sharti if (m->m_len == m->m_pkthdr.len) { 329144341Sharti m->m_len = ip->ip_len; 330144341Sharti m->m_pkthdr.len = ip->ip_len; 331144341Sharti } else 332144341Sharti m_adj(m, ip->ip_len - m->m_pkthdr.len); 333144341Sharti } 334144341Sharti /* 335144341Sharti * IpHack's section. 336144341Sharti * Right now when no processing on packet has done 337144341Sharti * and it is still fresh out of network we do our black 338144341Sharti * deals with it. 339144341Sharti * - Firewall: deny/allow/divert 340144341Sharti * - Xlate: translate packet's addr/port (NAT). 341144341Sharti * - Wrap: fake packet's addr/port <unimpl.> 342144341Sharti * - Encapsulate: put it in another IP and send out. <unimp.> 343144341Sharti */ 344144341Sharti#if defined(IPFILTER) || defined(IPFILTER_LKM) 345144341Sharti /* 346144341Sharti * Check if we want to allow this packet to be processed. 347144341Sharti * Consider it to be bad if not. 348144341Sharti */ 349144341Sharti if (fr_checkp) { 350144341Sharti struct mbuf *m1 = m; 351144341Sharti 352144341Sharti if ((*fr_checkp)(ip, hlen, m->m_pkthdr.rcvif, 0, &m1) || !m1) 353144341Sharti return; 354144341Sharti ip = mtod(m = m1, struct ip *); 355144341Sharti } 356144341Sharti#endif 357144341Sharti#ifdef COMPAT_IPFW 358144341Sharti if (ip_fw_chk_ptr) { 359144341Sharti u_int16_t port; 360144341Sharti 361144341Sharti#ifdef IPFIREWALL_FORWARD 362144341Sharti /* 363144341Sharti * If we've been forwarded from the output side, then 364144341Sharti * skip the firewall a second time 365144341Sharti */ 366144341Sharti if (ip_fw_fwd_addr) 367144341Sharti goto ours; 368144341Sharti#endif /* IPFIREWALL_FORWARD */ 369144341Sharti#ifdef IPDIVERT 370144341Sharti port = (*ip_fw_chk_ptr)(&ip, hlen, NULL, &ip_divert_cookie, 371144341Sharti &m, &ip_fw_fwd_addr); 372144341Sharti if (port) { 373144341Sharti /* Divert packet */ 374144341Sharti frag_divert_port = port; 375144341Sharti goto ours; 376144341Sharti } 377144341Sharti#else /* !DIVERT */ 378144341Sharti /* 379144341Sharti * If ipfw says divert, we have to just drop packet */ 380144341Sharti * Use port as a dummy argument. 381144341Sharti */ 382144341Sharti port = 0; 383144341Sharti if ((*ip_fw_chk_ptr)(&ip, hlen, NULL, &port, 384144341Sharti &m, &ip_fw_fwd_addr)) { 385144341Sharti m_freem(m); 386144341Sharti m = NULL; 387144341Sharti } 388144341Sharti#endif /* !DIVERT */ 389144341Sharti if (!m) 390144341Sharti return; 391144341Sharti } 392144341Sharti 393144341Sharti if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, m->m_pkthdr.rcvif, IP_NAT_IN)) 394144341Sharti return; 395144341Sharti#endif /* !COMPAT_IPFW */ 396144341Sharti 397144341Sharti /* 398144341Sharti * Process options and, if not destined for us, 3991590Srgrimes * ship it on. ip_dooptions returns 1 when an 4001590Srgrimes * error was detected (causing an icmp message 4011590Srgrimes * to be sent and the original packet to be freed). 402143100Sharti */ 4031590Srgrimes ip_nhops = 0; /* for source routed packets */ 4041590Srgrimes if (hlen > sizeof (struct ip) && ip_dooptions(m)) 4051590Srgrimes return; 4061590Srgrimes 407143100Sharti /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 4081590Srgrimes * matter if it is destined to another node, or whether it is 4091590Srgrimes * a multicast one, RSVP wants it! and prevents it from being forwarded 4101590Srgrimes * anywhere else. Also checks if the rsvp daemon is running before 4111590Srgrimes * grabbing the packet. 412143027Sharti */ 413143027Sharti if (rsvp_on && ip->ip_p==IPPROTO_RSVP) 4141590Srgrimes goto ours; 415143027Sharti 416143027Sharti /* 417138232Sharti * Check our list of addresses, to see if the packet is for us. 418143027Sharti */ 419143027Sharti for (ia = TAILQ_FIRST(&in_ifaddrhead); ia; 420143027Sharti ia = TAILQ_NEXT(ia, ia_link)) { 421143027Sharti#define satosin(sa) ((struct sockaddr_in *)(sa)) 422143027Sharti 423143027Sharti if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr) 424143027Sharti goto ours; 425143027Sharti#ifdef BOOTP_COMPAT 426143027Sharti if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) 4271590Srgrimes goto ours; 4281590Srgrimes#endif 4291590Srgrimes#ifdef IPFIREWALL_FORWARD 4301590Srgrimes /* 4311590Srgrimes * If the addr to forward to is one of ours, we pretend to 4321590Srgrimes * be the destination for this packet. 433143684Sharti */ 434143684Sharti if (ip_fw_fwd_addr != NULL && 435143684Sharti IA_SIN(ia)->sin_addr.s_addr == 436143684Sharti ip_fw_fwd_addr->sin_addr.s_addr) 4371590Srgrimes goto ours; 4381590Srgrimes#endif 4391590Srgrimes if (ia->ia_ifp && ia->ia_ifp->if_flags & IFF_BROADCAST) { 4401590Srgrimes if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 4411590Srgrimes ip->ip_dst.s_addr) 4421590Srgrimes goto ours; 443143684Sharti if (ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr) 444143684Sharti goto ours; 4451590Srgrimes } 446143684Sharti } 447143684Sharti if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 448143684Sharti struct in_multi *inm; 449138232Sharti if (ip_mrouter) { 450143684Sharti /* 451143684Sharti * If we are acting as a multicast router, all 4521590Srgrimes * incoming multicast packets are passed to the 453143684Sharti * kernel-level multicast forwarding function. 454143684Sharti * The packet is returned (relatively) intact; if 455143684Sharti * ip_mforward() returns a non-zero value, the packet 456143684Sharti * must be discarded, else it may be accepted below. 457143684Sharti * 458143684Sharti * (The IP ident field is put in the same byte order 459143684Sharti * as expected when ip_mforward() is called from 460143684Sharti * ip_output().) 461143684Sharti */ 462143684Sharti ip->ip_id = htons(ip->ip_id); 463143684Sharti if (ip_mforward(ip, m->m_pkthdr.rcvif, m, 0) != 0) { 464143684Sharti ipstat.ips_cantforward++; 4658874Srgrimes m_freem(m); 466143684Sharti return; 467143684Sharti } 468143684Sharti ip->ip_id = ntohs(ip->ip_id); 469143684Sharti 470143684Sharti /* 471143684Sharti * The process-level routing demon needs to receive 472143684Sharti * all multicast IGMP packets, whether or not this 473143684Sharti * host belongs to their destination groups. 474143684Sharti */ 475143684Sharti if (ip->ip_p == IPPROTO_IGMP) 476143684Sharti goto ours; 477143684Sharti ipstat.ips_forward++; 4781590Srgrimes } 479143684Sharti /* 480143684Sharti * See if we belong to the destination multicast group on the 481143684Sharti * arrival interface. 482143684Sharti */ 483143684Sharti IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 484143684Sharti if (inm == NULL) { 485143684Sharti ipstat.ips_notmember++; 486143684Sharti m_freem(m); 487143684Sharti return; 488143684Sharti } 489143684Sharti goto ours; 490143684Sharti } 4911590Srgrimes if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 492143684Sharti goto ours; 493143684Sharti if (ip->ip_dst.s_addr == INADDR_ANY) 494143684Sharti goto ours; 495143684Sharti 496143684Sharti /* 497143684Sharti * Not for us; forward if possible and desirable. 498143684Sharti */ 499143684Sharti if (ipforwarding == 0) { 500143684Sharti ipstat.ips_cantforward++; 501143684Sharti m_freem(m); 502143684Sharti } else 503143684Sharti ip_forward(m, 0); 504143684Sharti return; 5051590Srgrimes 5061590Srgrimesours: 5071590Srgrimes 5081590Srgrimes /* 5091590Srgrimes * If offset or IP_MF are set, must reassemble. 5101590Srgrimes * Otherwise, nothing need be done. 5111590Srgrimes * (We could look in the reassembly queue to see 5121590Srgrimes * if the packet was previously fragmented, 5131590Srgrimes * but it's not worth the time; just let them time out.) 5141590Srgrimes */ 5151590Srgrimes if (ip->ip_off & (IP_MF | IP_OFFMASK | IP_RF)) { 5161590Srgrimes if (m->m_flags & M_EXT) { /* XXX */ 5171590Srgrimes if ((m = m_pullup(m, sizeof (struct ip))) == 0) { 5181590Srgrimes ipstat.ips_toosmall++; 5191590Srgrimes#ifdef IPDIVERT 5201590Srgrimes frag_divert_port = 0; 5211590Srgrimes ip_divert_cookie = 0; 5221590Srgrimes#endif 5231590Srgrimes return; 5241590Srgrimes } 525138512Sharti ip = mtod(m, struct ip *); 5261590Srgrimes } 527144026Sharti sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id); 528145616Sharti /* 5291590Srgrimes * Look for queue of fragments 530145616Sharti * of this datagram. 531145616Sharti */ 532145616Sharti for (fp = ipq[sum].next; fp != &ipq[sum]; fp = fp->next) 533145616Sharti if (ip->ip_id == fp->ipq_id && 534144026Sharti ip->ip_src.s_addr == fp->ipq_src.s_addr && 535144026Sharti ip->ip_dst.s_addr == fp->ipq_dst.s_addr && 536145616Sharti ip->ip_p == fp->ipq_p) 537144026Sharti goto found; 538144026Sharti 539144026Sharti fp = 0; 540144026Sharti 5411590Srgrimes /* check if there's a place for the new queue */ 54218730Ssteve if (nipq > maxnipq) { 543144026Sharti /* 544144026Sharti * drop something from the tail of the current queue 545144026Sharti * before proceeding further 546144026Sharti */ 547144026Sharti if (ipq[sum].prev == &ipq[sum]) { /* gak */ 548144026Sharti for (i = 0; i < IPREASS_NHASH; i++) { 549144026Sharti if (ipq[i].prev != &ipq[i]) { 550144026Sharti ip_freef(ipq[i].prev); 551144026Sharti break; 552144026Sharti } 553144026Sharti } 554144026Sharti } else 555144026Sharti ip_freef(ipq[sum].prev); 556144026Sharti } 557144026Shartifound: 558144026Sharti /* 559144026Sharti * Adjust ip_len to not reflect header, 56018730Ssteve * set ip_mff if more fragments are expected, 561144026Sharti * convert offset of this to bytes. 562144026Sharti */ 563144026Sharti ip->ip_len -= hlen; 564144026Sharti ((struct ipasfrag *)ip)->ipf_mff &= ~1; 565144026Sharti if (ip->ip_off & IP_MF) 566144026Sharti ((struct ipasfrag *)ip)->ipf_mff |= 1; 567144026Sharti ip->ip_off <<= 3; 568144026Sharti 569144026Sharti /* 570144026Sharti * If datagram marked as having more fragments 571144026Sharti * or if this is not the first fragment, 572144026Sharti * attempt reassembly; if it succeeds, proceed. 573144026Sharti */ 574144026Sharti if (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) { 575144026Sharti ipstat.ips_fragments++; 576144026Sharti ip = ip_reass((struct ipasfrag *)ip, fp, &ipq[sum]); 57718730Ssteve if (ip == 0) { 578144026Sharti#ifdef IPFIREWALL_FORWARD 579144026Sharti ip_fw_fwd_addr = NULL; 580144026Sharti#endif 581144026Sharti return; 582144026Sharti } 583144026Sharti /* Get the length of the reassembled packets header */ 584144026Sharti hlen = IP_VHL_HL(ip->ip_vhl) << 2; 585144026Sharti ipstat.ips_reassembled++; 586144026Sharti m = dtom(ip); 587144026Sharti#ifdef IPDIVERT 588144026Sharti if (frag_divert_port) { 589144026Sharti ip->ip_len += hlen; 590144026Sharti HTONS(ip->ip_len); 5911590Srgrimes HTONS(ip->ip_off); 592144026Sharti HTONS(ip->ip_id); 5931590Srgrimes ip->ip_sum = 0; 594144026Sharti ip->ip_sum = in_cksum_hdr(ip); 5951590Srgrimes NTOHS(ip->ip_id); 596144026Sharti NTOHS(ip->ip_off); 597144026Sharti NTOHS(ip->ip_len); 598144026Sharti ip->ip_len -= hlen; 599144026Sharti } 600144026Sharti#endif 601144026Sharti } else 602144026Sharti if (fp) 603144026Sharti ip_freef(fp); 604144026Sharti } else 605144026Sharti ip->ip_len -= hlen; 606144026Sharti 607144026Sharti#ifdef IPDIVERT 608144026Sharti /* 609144026Sharti * Divert reassembled packets to the divert protocol if required 610144026Sharti * If divert port is null then cookie should be too, 6111590Srgrimes * so we shouldn't need to clear them here. Assume ip_divert does so. 61218730Ssteve */ 613144026Sharti if (frag_divert_port) { 614144026Sharti ipstat.ips_delivered++; 615144026Sharti ip_divert_port = frag_divert_port; 616144026Sharti frag_divert_port = 0; 617144026Sharti (*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, hlen); 6181590Srgrimes return; 619143684Sharti } 620144026Sharti 621144026Sharti /* Don't let packets divert themselves */ 622144026Sharti if (ip->ip_p == IPPROTO_DIVERT) { 623143684Sharti ipstat.ips_noproto++; 624144026Sharti goto bad; 625144026Sharti } 626144026Sharti 627144026Sharti#endif 628144026Sharti 629144026Sharti /* 630144026Sharti * Switch out to protocol's input routine. 631144026Sharti */ 632144026Sharti ipstat.ips_delivered++; 633144026Sharti (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen); 634144026Sharti#ifdef IPFIREWALL_FORWARD 635144026Sharti ip_fw_fwd_addr = NULL; /* tcp needed it */ 636144026Sharti#endif 637143684Sharti return; 6381590Srgrimesbad: 6391590Srgrimes#ifdef IPFIREWALL_FORWARD 640138232Sharti ip_fw_fwd_addr = NULL; 6411590Srgrimes#endif 6421590Srgrimes m_freem(m); 6431590Srgrimes} 6441590Srgrimes 6451590Srgrimes/* 6461590Srgrimes * IP software interrupt routine - to go away sometime soon 6471590Srgrimes */ 6481590Srgrimesstatic void 6491590Srgrimesipintr(void) 6501590Srgrimes{ 6511590Srgrimes int s; 6521590Srgrimes struct mbuf *m; 6531590Srgrimes 6541590Srgrimes while(1) { 6551590Srgrimes s = splimp(); 6561590Srgrimes IF_DEQUEUE(&ipintrq, m); 6571590Srgrimes splx(s); 658144026Sharti if (m == 0) 6591590Srgrimes return; 6601590Srgrimes ip_input(m); 6611590Srgrimes } 6621590Srgrimes} 6631590Srgrimes 6641590SrgrimesNETISR_SET(NETISR_IP, ipintr); 6651590Srgrimes 6661590Srgrimes/* 6671590Srgrimes * Take incoming datagram fragment and try to 6681590Srgrimes * reassemble it into whole datagram. If a chain for 6691590Srgrimes * reassembly of this datagram already exists, then it 6701590Srgrimes * is given as fp; otherwise have to make a chain. 6711590Srgrimes */ 6721590Srgrimesstatic struct ip * 6731590Srgrimesip_reass(ip, fp, where) 6741590Srgrimes register struct ipasfrag *ip; 6751590Srgrimes register struct ipq *fp; 676141270Sharti struct ipq *where; 6771590Srgrimes{ 678144026Sharti register struct mbuf *m = dtom(ip); 679144026Sharti register struct ipasfrag *q; 680144026Sharti struct mbuf *t; 681144026Sharti int hlen = ip->ip_hl << 2; 682144026Sharti int i, next; 683144026Sharti 684144026Sharti /* 685145616Sharti * Presence of header sizes in mbufs 6861590Srgrimes * would confuse code below. 687144026Sharti */ 6881590Srgrimes m->m_data += hlen; 689144026Sharti m->m_len -= hlen; 690144026Sharti 691144026Sharti /* 6921590Srgrimes * If first fragment to arrive, create a reassembly queue. 693144026Sharti */ 694144026Sharti if (fp == 0) { 695144026Sharti if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL) 696144026Sharti goto dropfrag; 697144026Sharti fp = mtod(t, struct ipq *); 698144026Sharti insque(fp, where); 699144026Sharti nipq++; 700144026Sharti fp->ipq_ttl = IPFRAGTTL; 701144026Sharti fp->ipq_p = ip->ip_p; 702144026Sharti fp->ipq_id = ip->ip_id; 703144026Sharti fp->ipq_next = fp->ipq_prev = (struct ipasfrag *)fp; 704144026Sharti fp->ipq_src = ((struct ip *)ip)->ip_src; 705144026Sharti fp->ipq_dst = ((struct ip *)ip)->ip_dst; 706144026Sharti#ifdef IPDIVERT 707144026Sharti fp->ipq_divert = 0; 708144026Sharti fp->ipq_div_cookie = 0; 7091590Srgrimes#endif 710144026Sharti q = (struct ipasfrag *)fp; 711144026Sharti goto insert; 7121590Srgrimes } 713144026Sharti 714144026Sharti /* 715144026Sharti * Find a segment which begins after this one does. 716144026Sharti */ 717102178Sru for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) 718144026Sharti if (q->ip_off > ip->ip_off) 719144026Sharti break; 720144026Sharti 721144026Sharti /* 722144026Sharti * If there is a preceding segment, it may provide some of 723144026Sharti * our data already. If so, drop the data from the incoming 724144026Sharti * segment. If it provides all of our data, drop us. 725144026Sharti */ 726144026Sharti if (q->ipf_prev != (struct ipasfrag *)fp) { 727144026Sharti i = q->ipf_prev->ip_off + q->ipf_prev->ip_len - ip->ip_off; 728144026Sharti if (i > 0) { 729144026Sharti if (i >= ip->ip_len) 730144026Sharti goto dropfrag; 731144026Sharti m_adj(dtom(ip), i); 732144026Sharti ip->ip_off += i; 733144026Sharti ip->ip_len -= i; 734102178Sru } 735144026Sharti } 736144026Sharti 737102178Sru /* 738144026Sharti * While we overlap succeeding segments trim them or, 739144026Sharti * if they are completely covered, dequeue them. 740144026Sharti */ 741102178Sru while (q != (struct ipasfrag *)fp && 742144026Sharti ip->ip_off + ip->ip_len > q->ip_off) { 7438874Srgrimes struct mbuf *m0; 744144026Sharti 745144026Sharti i = (ip->ip_off + ip->ip_len) - q->ip_off; 746144026Sharti if (i < q->ip_len) { 747144026Sharti q->ip_len -= i; 748144026Sharti q->ip_off += i; 7491590Srgrimes m_adj(dtom(q), i); 750144026Sharti break; 751144026Sharti } 752144026Sharti m0 = dtom(q); 753144026Sharti q = q->ipf_next; 754144026Sharti ip_deq(q->ipf_prev); 755144026Sharti m_freem(m0); 756144026Sharti } 757144026Sharti 758144026Shartiinsert: 759144026Sharti 760144026Sharti#ifdef IPDIVERT 761144026Sharti /* 762144026Sharti * Any fragment diverting causes the whole packet to divert 763144026Sharti */ 764144026Sharti if (frag_divert_port) { 765144026Sharti fp->ipq_divert = frag_divert_port; 766144026Sharti fp->ipq_div_cookie = ip_divert_cookie; 767144026Sharti } 768144026Sharti frag_divert_port = 0; 769144026Sharti ip_divert_cookie = 0; 770144026Sharti#endif 771144026Sharti 772144026Sharti /* 773144026Sharti * Stick new segment in its place; 774144026Sharti * check for complete reassembly. 7758874Srgrimes */ 776144026Sharti ip_enq(ip, q->ipf_prev); 777144026Sharti next = 0; 778144026Sharti for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) { 779144026Sharti if (q->ip_off != next) 780144026Sharti return (0); 781144026Sharti next += q->ip_len; 782144026Sharti } 783144026Sharti if (q->ipf_prev->ipf_mff & 1) 784144026Sharti return (0); 785144026Sharti 786144026Sharti /* 787144026Sharti * Reassembly is complete. Make sure the packet is a sane size. 788144026Sharti */ 789144026Sharti if (next + (IP_VHL_HL(((struct ip *)fp->ipq_next)->ip_vhl) << 2) 790144026Sharti > IP_MAXPACKET) { 791144026Sharti ipstat.ips_toolong++; 792144026Sharti ip_freef(fp); 7931590Srgrimes return (0); 794144026Sharti } 795144026Sharti 7961590Srgrimes /* 797144026Sharti * Concatenate fragments. 798144026Sharti */ 799144026Sharti q = fp->ipq_next; 800144026Sharti m = dtom(q); 801144026Sharti t = m->m_next; 802145616Sharti m->m_next = 0; 803145616Sharti m_cat(m, t); 804144026Sharti q = q->ipf_next; 805144026Sharti while (q != (struct ipasfrag *)fp) { 806144026Sharti t = dtom(q); 807144026Sharti q = q->ipf_next; 808144026Sharti m_cat(m, t); 809145616Sharti } 810145616Sharti 811144026Sharti#ifdef IPDIVERT 812144026Sharti /* 813144026Sharti * extract divert port for packet, if any 814144026Sharti */ 815144026Sharti frag_divert_port = fp->ipq_divert; 816144026Sharti ip_divert_cookie = fp->ipq_div_cookie; 817144026Sharti#endif 818144026Sharti 819144026Sharti /* 820144026Sharti * Create header for new ip packet by 821144026Sharti * modifying header of first packet; 822144026Sharti * dequeue and discard fragment reassembly header. 823144026Sharti * Make header visible. 824144026Sharti */ 825144026Sharti ip = fp->ipq_next; 826144026Sharti ip->ip_len = next; 827144026Sharti ip->ipf_mff &= ~1; 828144026Sharti ((struct ip *)ip)->ip_src = fp->ipq_src; 829144026Sharti ((struct ip *)ip)->ip_dst = fp->ipq_dst; 830144026Sharti remque(fp); 831144026Sharti nipq--; 832144026Sharti (void) m_free(dtom(fp)); 833144026Sharti m = dtom(ip); 834144026Sharti m->m_len += (ip->ip_hl << 2); 835144026Sharti m->m_data -= (ip->ip_hl << 2); 836144026Sharti /* some debugging cruft by sklower, below, will go away soon */ 837144026Sharti if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */ 838144026Sharti register int plen = 0; 839144026Sharti for (t = m; m; m = m->m_next) 840144026Sharti plen += m->m_len; 841144026Sharti t->m_pkthdr.len = plen; 842144026Sharti } 843144026Sharti return ((struct ip *)ip); 844144026Sharti 845144026Shartidropfrag: 846144026Sharti#ifdef IPDIVERT 847144026Sharti frag_divert_port = 0; 848144026Sharti ip_divert_cookie = 0; 849144026Sharti#endif 850144026Sharti ipstat.ips_fragdropped++; 851144026Sharti m_freem(m); 852144026Sharti return (0); 853144026Sharti} 854144026Sharti 855144026Sharti/* 856144026Sharti * Free a fragment reassembly header and all 857144026Sharti * associated datagrams. 858144026Sharti */ 859144026Shartistatic void 860144026Shartiip_freef(fp) 861144026Sharti struct ipq *fp; 862144026Sharti{ 863144026Sharti register struct ipasfrag *q, *p; 864144026Sharti 865144026Sharti for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = p) { 866144026Sharti p = q->ipf_next; 867144026Sharti ip_deq(q); 868144026Sharti m_freem(dtom(q)); 869144026Sharti } 870144026Sharti remque(fp); 871144026Sharti (void) m_free(dtom(fp)); 872144026Sharti nipq--; 873144026Sharti} 874144026Sharti 875144026Sharti/* 876144026Sharti * Put an ip fragment on a reassembly chain. 877144026Sharti * Like insque, but pointers in middle of structure. 878144026Sharti */ 879144026Shartistatic void 880144026Shartiip_enq(p, prev) 881144026Sharti register struct ipasfrag *p, *prev; 882144026Sharti{ 883144026Sharti 884144026Sharti p->ipf_prev = prev; 885144026Sharti p->ipf_next = prev->ipf_next; 886144026Sharti prev->ipf_next->ipf_prev = p; 887144026Sharti prev->ipf_next = p; 888144026Sharti} 889144026Sharti 890144026Sharti/* 891144026Sharti * To ip_enq as remque is to insque. 892144026Sharti */ 893144026Shartistatic void 8941590Srgrimesip_deq(p) 8951590Srgrimes register struct ipasfrag *p; 896144026Sharti{ 8971590Srgrimes 898144026Sharti p->ipf_prev->ipf_next = p->ipf_next; 899144026Sharti p->ipf_next->ipf_prev = p->ipf_prev; 9001590Srgrimes} 901144029Sharti 9028874Srgrimes/* 903144026Sharti * IP timer processing; 904144026Sharti * if a timer expires on a reassembly 9058874Srgrimes * queue, discard it. 906144026Sharti */ 907144026Shartivoid 908144026Shartiip_slowtimo() 909144026Sharti{ 910144026Sharti register struct ipq *fp; 911144026Sharti int s = splnet(); 912144026Sharti int i; 913144026Sharti 914144026Sharti for (i = 0; i < IPREASS_NHASH; i++) { 915144026Sharti fp = ipq[i].next; 916138916Sharti if (fp == 0) 917144026Sharti continue; 918144026Sharti while (fp != &ipq[i]) { 9198874Srgrimes --fp->ipq_ttl; 920144026Sharti fp = fp->next; 921144026Sharti if (fp->prev->ipq_ttl == 0) { 922144026Sharti ipstat.ips_fragtimeout++; 923144026Sharti ip_freef(fp->prev); 924144026Sharti } 925144026Sharti } 926144026Sharti } 927144026Sharti ipflow_slowtimo(); 9288874Srgrimes splx(s); 929144026Sharti} 930144026Sharti 931144026Sharti/* 932144026Sharti * Drain off all datagram fragments. 933144026Sharti */ 934144026Shartivoid 935144026Shartiip_drain() 936144026Sharti{ 937144026Sharti int i; 938144026Sharti 939144026Sharti for (i = 0; i < IPREASS_NHASH; i++) { 940144026Sharti while (ipq[i].next != &ipq[i]) { 941144026Sharti ipstat.ips_fragdropped++; 942144026Sharti ip_freef(ipq[i].next); 943144026Sharti } 944144026Sharti } 945144026Sharti in_rtqdrain(); 946144026Sharti} 9471590Srgrimes 948144026Sharti/* 949144026Sharti * Do option processing on a datagram, 9501590Srgrimes * possibly discarding it if bad options are encountered, 951144026Sharti * or forwarding it if source-routed. 952144026Sharti * Returns 1 if packet has been forwarded/freed, 9538874Srgrimes * 0 if the packet should be processed further. 954144029Sharti */ 955144026Shartistatic int 956144026Shartiip_dooptions(m) 957144026Sharti struct mbuf *m; 958144026Sharti{ 959144026Sharti register struct ip *ip = mtod(m, struct ip *); 960144026Sharti register u_char *cp; 961144026Sharti register struct ip_timestamp *ipt; 962144026Sharti register struct in_ifaddr *ia; 963144026Sharti int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 9641590Srgrimes struct in_addr *sin, dst; 965144026Sharti n_time ntime; 966144026Sharti 967144026Sharti dst = ip->ip_dst; 9681590Srgrimes cp = (u_char *)(ip + 1); 969144026Sharti cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); 970144029Sharti for (; cnt > 0; cnt -= optlen, cp += optlen) { 9718874Srgrimes opt = cp[IPOPT_OPTVAL]; 972144026Sharti if (opt == IPOPT_EOL) 973144026Sharti break; 974144026Sharti if (opt == IPOPT_NOP) 975144026Sharti optlen = 1; 976144026Sharti else { 977144026Sharti optlen = cp[IPOPT_OLEN]; 978144026Sharti if (optlen <= 0 || optlen > cnt) { 979144026Sharti code = &cp[IPOPT_OLEN] - (u_char *)ip; 980144026Sharti goto bad; 981144026Sharti } 982144026Sharti } 983144026Sharti switch (opt) { 984144026Sharti 985144026Sharti default: 986144026Sharti break; 987144026Sharti 988144026Sharti /* 989144026Sharti * Source routing with record. 990144026Sharti * Find interface with current destination address. 991144026Sharti * If none on this machine then drop if strictly routed, 992144026Sharti * or do nothing if loosely routed. 9931590Srgrimes * Record interface address and bring up next address 9948874Srgrimes * component. If strictly routed make sure next 9951590Srgrimes * address is on directly accessible net. 996144026Sharti */ 997144026Sharti case IPOPT_LSRR: 9981590Srgrimes case IPOPT_SSRR: 999144026Sharti if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1000144026Sharti code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1001144026Sharti goto bad; 1002144026Sharti } 1003144026Sharti ipaddr.sin_addr = ip->ip_dst; 1004144026Sharti ia = (struct in_ifaddr *) 1005144026Sharti ifa_ifwithaddr((struct sockaddr *)&ipaddr); 1006144026Sharti if (ia == 0) { 10071590Srgrimes if (opt == IPOPT_SSRR) { 10081590Srgrimes type = ICMP_UNREACH; 1009144026Sharti code = ICMP_UNREACH_SRCFAIL; 1010144026Sharti goto bad; 1011144026Sharti } 1012144026Sharti if (!ip_dosourceroute) 1013144026Sharti goto nosourcerouting; 1014144026Sharti /* 1015144026Sharti * Loose routing, and not at next destination 1016144026Sharti * yet; nothing to do except forward. 1017144026Sharti */ 1018144026Sharti break; 1019144026Sharti } 1020144026Sharti off--; /* 0 origin */ 10211590Srgrimes if (off > optlen - sizeof(struct in_addr)) { 10221590Srgrimes /* 10231590Srgrimes * End of source route. Should be for us. 10241590Srgrimes */ 1025144026Sharti if (!ip_acceptsourceroute) 1026144026Sharti goto nosourcerouting; 1027144026Sharti save_rte(cp, ip->ip_src); 1028144026Sharti break; 1029144026Sharti } 1030144026Sharti 1031144026Sharti if (!ip_dosourceroute) { 1032144026Sharti char buf[4*sizeof "123"]; 1033144026Sharti 1034144026Shartinosourcerouting: 1035144026Sharti strcpy(buf, inet_ntoa(ip->ip_dst)); 1036144026Sharti log(LOG_WARNING, 1037144026Sharti "attempted source route from %s to %s\n", 1038144026Sharti inet_ntoa(ip->ip_src), buf); 1039144026Sharti type = ICMP_UNREACH; 1040144026Sharti code = ICMP_UNREACH_SRCFAIL; 1041144026Sharti goto bad; 1042144026Sharti } 1043144026Sharti 1044144026Sharti /* 1045144026Sharti * locate outgoing interface 1046144026Sharti */ 1047144026Sharti (void)memcpy(&ipaddr.sin_addr, cp + off, 1048144026Sharti sizeof(ipaddr.sin_addr)); 1049144026Sharti 1050144026Sharti if (opt == IPOPT_SSRR) { 1051144026Sharti#define INA struct in_ifaddr * 1052144026Sharti#define SA struct sockaddr * 1053144026Sharti if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) 1054144026Sharti ia = (INA)ifa_ifwithnet((SA)&ipaddr); 1055144026Sharti } else 1056144026Sharti ia = ip_rtaddr(ipaddr.sin_addr); 1057144026Sharti if (ia == 0) { 1058144026Sharti type = ICMP_UNREACH; 1059144026Sharti code = ICMP_UNREACH_SRCFAIL; 10601590Srgrimes goto bad; 1061144026Sharti } 1062144026Sharti ip->ip_dst = ipaddr.sin_addr; 1063144026Sharti (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), 10641590Srgrimes sizeof(struct in_addr)); 1065144026Sharti cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1066144026Sharti /* 10671590Srgrimes * Let ip_intr's mcast routing check handle mcast pkts 1068144026Sharti */ 1069144026Sharti forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); 1070144026Sharti break; 1071144026Sharti 1072144026Sharti case IPOPT_RR: 1073144026Sharti if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1074144026Sharti code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1075144026Sharti goto bad; 1076144029Sharti } 1077144026Sharti /* 10781590Srgrimes * If no space remains, ignore. 10791590Srgrimes */ 1080144026Sharti off--; /* 0 origin */ 1081144026Sharti if (off > optlen - sizeof(struct in_addr)) 1082144026Sharti break; 1083144029Sharti (void)memcpy(&ipaddr.sin_addr, &ip->ip_dst, 1084144029Sharti sizeof(ipaddr.sin_addr)); 1085144029Sharti /* 1086144026Sharti * locate outgoing interface; if we're the destination, 1087144026Sharti * use the incoming interface (should be same). 1088144026Sharti */ 1089144026Sharti if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && 1090144026Sharti (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) { 1091144026Sharti type = ICMP_UNREACH; 1092144026Sharti code = ICMP_UNREACH_HOST; 1093144026Sharti goto bad; 1094144026Sharti } 1095144026Sharti (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), 1096144026Sharti sizeof(struct in_addr)); 1097144026Sharti cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1098144026Sharti break; 1099144026Sharti 1100144026Sharti case IPOPT_TS: 1101144026Sharti code = cp - (u_char *)ip; 1102144026Sharti ipt = (struct ip_timestamp *)cp; 1103144026Sharti if (ipt->ipt_len < 5) 1104144026Sharti goto bad; 1105144026Sharti if (ipt->ipt_ptr > ipt->ipt_len - sizeof (long)) { 1106144026Sharti if (++ipt->ipt_oflw == 0) 1107144026Sharti goto bad; 1108144026Sharti break; 1109144026Sharti } 1110144026Sharti sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); 1111144026Sharti switch (ipt->ipt_flg) { 1112144026Sharti 1113144026Sharti case IPOPT_TS_TSONLY: 1114144026Sharti break; 1115144026Sharti 1116144026Sharti case IPOPT_TS_TSANDADDR: 1117144026Sharti if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1118144026Sharti sizeof(struct in_addr) > ipt->ipt_len) 1119144026Sharti goto bad; 1120144026Sharti ipaddr.sin_addr = dst; 1121144026Sharti ia = (INA)ifaof_ifpforaddr((SA)&ipaddr, 1122144026Sharti m->m_pkthdr.rcvif); 1123144026Sharti if (ia == 0) 1124144026Sharti continue; 1125144026Sharti (void)memcpy(sin, &IA_SIN(ia)->sin_addr, 1126144026Sharti sizeof(struct in_addr)); 1127144026Sharti ipt->ipt_ptr += sizeof(struct in_addr); 1128144026Sharti break; 1129144026Sharti 1130144026Sharti case IPOPT_TS_PRESPEC: 1131144026Sharti if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1132144026Sharti sizeof(struct in_addr) > ipt->ipt_len) 1133144026Sharti goto bad; 1134144026Sharti (void)memcpy(&ipaddr.sin_addr, sin, 1135144026Sharti sizeof(struct in_addr)); 1136144026Sharti if (ifa_ifwithaddr((SA)&ipaddr) == 0) 1137144026Sharti continue; 1138144026Sharti ipt->ipt_ptr += sizeof(struct in_addr); 1139144026Sharti break; 1140144026Sharti 1141144026Sharti default: 1142144026Sharti goto bad; 1143144026Sharti } 1144144026Sharti ntime = iptime(); 1145144026Sharti (void)memcpy(cp + ipt->ipt_ptr - 1, &ntime, 1146144026Sharti sizeof(n_time)); 1147144026Sharti ipt->ipt_ptr += sizeof(n_time); 1148144026Sharti } 11491590Srgrimes } 1150144026Sharti if (forward && ipforwarding) { 1151144026Sharti ip_forward(m, 1); 1152144026Sharti return (1); 11531590Srgrimes } 1154144026Sharti return (0); 1155144026Shartibad: 1156144026Sharti ip->ip_len -= IP_VHL_HL(ip->ip_vhl) << 2; /* XXX icmp_error adds in hdr length */ 1157144026Sharti icmp_error(m, type, code, 0, 0); 1158144026Sharti ipstat.ips_badoptions++; 1159144026Sharti return (1); 1160144026Sharti} 1161144026Sharti 1162144026Sharti/* 1163144026Sharti * Given address of next destination (final or next hop), 1164144026Sharti * return internet address info of interface to be used to get there. 1165144026Sharti */ 1166144026Shartistatic struct in_ifaddr * 1167144026Shartiip_rtaddr(dst) 1168144026Sharti struct in_addr dst; 1169144026Sharti{ 1170144026Sharti register struct sockaddr_in *sin; 1171144026Sharti 1172144026Sharti sin = (struct sockaddr_in *) &ipforward_rt.ro_dst; 1173144026Sharti 11741590Srgrimes if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) { 1175144026Sharti if (ipforward_rt.ro_rt) { 1176144026Sharti RTFREE(ipforward_rt.ro_rt); 11778874Srgrimes ipforward_rt.ro_rt = 0; 1178144026Sharti } 1179144026Sharti sin->sin_family = AF_INET; 1180138916Sharti sin->sin_len = sizeof(*sin); 1181144026Sharti sin->sin_addr = dst; 1182144026Sharti 1183144026Sharti rtalloc_ign(&ipforward_rt, RTF_PRCLONING); 1184144026Sharti } 1185144026Sharti if (ipforward_rt.ro_rt == 0) 1186144026Sharti return ((struct in_ifaddr *)0); 1187141270Sharti return ((struct in_ifaddr *) ipforward_rt.ro_rt->rt_ifa); 1188144026Sharti} 1189144026Sharti 1190144026Sharti/* 1191144026Sharti * Save incoming source route for use in replies, 1192144026Sharti * to be picked up later by ip_srcroute if the receiver is interested. 1193144026Sharti */ 1194144026Shartivoid 1195144026Shartisave_rte(option, dst) 1196144026Sharti u_char *option; 1197144026Sharti struct in_addr dst; 11981590Srgrimes{ 1199144026Sharti unsigned olen; 1200144026Sharti 1201144026Sharti olen = option[IPOPT_OLEN]; 1202144026Sharti#ifdef DIAGNOSTIC 1203144026Sharti if (ipprintfs) 1204144026Sharti printf("save_rte: olen %d\n", olen); 12051590Srgrimes#endif 1206144026Sharti if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1207144026Sharti return; 12081590Srgrimes bcopy(option, ip_srcrt.srcopt, olen); 1209144026Sharti ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1210144026Sharti ip_srcrt.dst = dst; 1211144026Sharti} 1212144026Sharti 1213144026Sharti/* 1214144026Sharti * Retrieve incoming source route for use in replies, 1215144026Sharti * in the same form used by setsockopt. 1216144026Sharti * The first hop is placed before the options, will be removed later. 1217144026Sharti */ 1218144026Shartistruct mbuf * 1219144026Shartiip_srcroute() 1220144026Sharti{ 1221144026Sharti register struct in_addr *p, *q; 1222144026Sharti register struct mbuf *m; 1223144026Sharti 12241590Srgrimes if (ip_nhops == 0) 12251590Srgrimes return ((struct mbuf *)0); 12261590Srgrimes m = m_get(M_DONTWAIT, MT_SOOPTS); 12271590Srgrimes if (m == 0) 12281590Srgrimes return ((struct mbuf *)0); 12291590Srgrimes 12301590Srgrimes#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 12311590Srgrimes 12321590Srgrimes /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 12331590Srgrimes m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 12341590Srgrimes OPTSIZ; 12351590Srgrimes#ifdef DIAGNOSTIC 12361590Srgrimes if (ipprintfs) 12371590Srgrimes printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 12381590Srgrimes#endif 12391590Srgrimes 12401590Srgrimes /* 12411590Srgrimes * First save first hop for return route 12421590Srgrimes */ 12431590Srgrimes p = &ip_srcrt.route[ip_nhops - 1]; 12441590Srgrimes *(mtod(m, struct in_addr *)) = *p--; 1245138232Sharti#ifdef DIAGNOSTIC 12461590Srgrimes if (ipprintfs) 1247144026Sharti printf(" hops %lx", ntohl(mtod(m, struct in_addr *)->s_addr)); 1248144026Sharti#endif 1249138232Sharti 1250144026Sharti /* 1251103503Sjmallett * Copy option fields and padding (nop) to mbuf. 1252144029Sharti */ 12531590Srgrimes ip_srcrt.nop = IPOPT_NOP; 1254144026Sharti ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1255144026Sharti (void)memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), 1256144026Sharti &ip_srcrt.nop, OPTSIZ); 1257144029Sharti q = (struct in_addr *)(mtod(m, caddr_t) + 1258144026Sharti sizeof(struct in_addr) + OPTSIZ); 12591590Srgrimes#undef OPTSIZ 1260144026Sharti /* 1261144026Sharti * Record return path as an IP source route, 1262144026Sharti * reversing the path (pointers are now aligned). 1263144026Sharti */ 1264144026Sharti while (p >= ip_srcrt.route) { 1265144026Sharti#ifdef DIAGNOSTIC 1266144026Sharti if (ipprintfs) 126718730Ssteve printf(" %lx", ntohl(q->s_addr)); 1268144026Sharti#endif 1269144026Sharti *q++ = *p--; 1270144026Sharti } 1271144026Sharti /* 1272144026Sharti * Last hop goes to final destination. 1273144026Sharti */ 1274144026Sharti *q = ip_srcrt.dst; 1275144026Sharti#ifdef DIAGNOSTIC 127618730Ssteve if (ipprintfs) 1277144026Sharti printf(" %lx\n", ntohl(q->s_addr)); 1278144026Sharti#endif 1279144026Sharti return (m); 1280144026Sharti} 128118730Ssteve 1282144026Sharti/* 1283144026Sharti * Strip out IP options, at higher 1284144026Sharti * level protocol in the kernel. 1285144026Sharti * Second argument is buffer to which options 128618730Ssteve * will be moved, and return value is their length. 1287144026Sharti * XXX should be deleted; last arg currently ignored. 1288144026Sharti */ 1289144026Shartivoid 1290144026Shartiip_stripoptions(m, mopt) 1291144026Sharti register struct mbuf *m; 1292144026Sharti struct mbuf *mopt; 1293144026Sharti{ 1294144026Sharti register int i; 129518730Ssteve struct ip *ip = mtod(m, struct ip *); 1296144026Sharti register caddr_t opts; 1297144026Sharti int olen; 1298144026Sharti 1299144026Sharti olen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); 1300144026Sharti opts = (caddr_t)(ip + 1); 1301144026Sharti i = m->m_len - (sizeof (struct ip) + olen); 1302144026Sharti bcopy(opts + olen, opts, (unsigned)i); 130318730Ssteve m->m_len -= olen; 1304144026Sharti if (m->m_flags & M_PKTHDR) 1305144026Sharti m->m_pkthdr.len -= olen; 1306144026Sharti ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2); 1307144026Sharti} 1308144026Sharti 130918730Ssteveu_char inetctlerrmap[PRC_NCMDS] = { 1310144026Sharti 0, 0, 0, 0, 1311144026Sharti 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1312144026Sharti EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1313144026Sharti EMSGSIZE, EHOSTUNREACH, 0, 0, 1314144026Sharti 0, 0, 0, 0, 1315144026Sharti ENOPROTOOPT 1316144026Sharti}; 1317144026Sharti 1318144026Sharti/* 1319144026Sharti * Forward a packet. If some error occurs return the sender 1320144026Sharti * an icmp packet. Note we can't always generate a meaningful 1321144026Sharti * icmp message because icmp doesn't have a large enough repertoire 1322144026Sharti * of codes and types. 13231590Srgrimes * 13241590Srgrimes * If not forwarding, just drop the packet. This could be confusing 1325144026Sharti * if ipforwarding was zero but some routing protocol was advancing 13261590Srgrimes * us as a gateway to somewhere. However, we must let the routing 13271590Srgrimes * protocol deal with that. 13281590Srgrimes * 13291590Srgrimes * The srcrt parameter indicates whether the packet is being forwarded 13301590Srgrimes * via a source route. 13311590Srgrimes */ 13321590Srgrimesstatic void 13331590Srgrimesip_forward(m, srcrt) 13341590Srgrimes struct mbuf *m; 13351590Srgrimes int srcrt; 13361590Srgrimes{ 13371590Srgrimes register struct ip *ip = mtod(m, struct ip *); 13381590Srgrimes register struct sockaddr_in *sin; 13391590Srgrimes register struct rtentry *rt; 13401590Srgrimes int error, type = 0, code = 0; 13411590Srgrimes struct mbuf *mcopy; 13421590Srgrimes n_long dest; 13431590Srgrimes struct ifnet *destifp; 13441590Srgrimes 13451590Srgrimes dest = 0; 13461590Srgrimes#ifdef DIAGNOSTIC 13471590Srgrimes if (ipprintfs) 13481590Srgrimes printf("forward: src %lx dst %lx ttl %x\n", 1349138232Sharti ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl); 13501590Srgrimes#endif 1351144026Sharti 1352144026Sharti 1353144026Sharti if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { 1354144026Sharti ipstat.ips_cantforward++; 1355144026Sharti m_freem(m); 1356144026Sharti return; 1357144026Sharti } 1358144026Sharti HTONS(ip->ip_id); 1359144026Sharti if (ip->ip_ttl <= IPTTLDEC) { 1360144026Sharti icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1361144026Sharti return; 1362144026Sharti } 1363144026Sharti ip->ip_ttl -= IPTTLDEC; 1364144026Sharti 13651590Srgrimes sin = (struct sockaddr_in *)&ipforward_rt.ro_dst; 1366144026Sharti if ((rt = ipforward_rt.ro_rt) == 0 || 1367144026Sharti ip->ip_dst.s_addr != sin->sin_addr.s_addr) { 13685814Sjkh if (ipforward_rt.ro_rt) { 13691590Srgrimes RTFREE(ipforward_rt.ro_rt); 1370144026Sharti ipforward_rt.ro_rt = 0; 1371144026Sharti } 1372144026Sharti sin->sin_family = AF_INET; 1373144029Sharti sin->sin_len = sizeof(*sin); 1374144026Sharti sin->sin_addr = ip->ip_dst; 1375144026Sharti 13761590Srgrimes rtalloc_ign(&ipforward_rt, RTF_PRCLONING); 1377144026Sharti if (ipforward_rt.ro_rt == 0) { 1378144026Sharti icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); 1379144026Sharti return; 1380144026Sharti } 1381144026Sharti rt = ipforward_rt.ro_rt; 1382144026Sharti } 1383144026Sharti 13841590Srgrimes /* 1385144026Sharti * Save at most 64 bytes of the packet in case 1386144026Sharti * we need to generate an ICMP message to the src. 13871590Srgrimes */ 1388144026Sharti mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64)); 1389144026Sharti 1390144026Sharti /* 1391144026Sharti * If forwarding packet using same interface that it came in on, 1392144026Sharti * perhaps should send a redirect to sender to shortcut a hop. 1393144026Sharti * Only send redirect if source is sending directly to us, 1394144026Sharti * and if packet was not source routed (or has any options). 1395144026Sharti * Also, don't send redirect if forwarding using a default route 13961590Srgrimes * or a route modified by a redirect. 1397144026Sharti */ 1398144026Sharti#define satosin(sa) ((struct sockaddr_in *)(sa)) 1399144026Sharti if (rt->rt_ifp == m->m_pkthdr.rcvif && 1400144026Sharti (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1401144026Sharti satosin(rt_key(rt))->sin_addr.s_addr != 0 && 1402144026Sharti ipsendredirects && !srcrt) { 1403144026Sharti#define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) 1404144026Sharti u_long src = ntohl(ip->ip_src.s_addr); 1405144026Sharti 1406144026Sharti if (RTA(rt) && 1407144026Sharti (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) { 14081590Srgrimes if (rt->rt_flags & RTF_GATEWAY) 1409144026Sharti dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1410144026Sharti else 1411144026Sharti dest = ip->ip_dst.s_addr; 1412144026Sharti /* Router requirements says to only send host redirects */ 14131590Srgrimes type = ICMP_REDIRECT; 1414144026Sharti code = ICMP_REDIRECT_HOST; 1415144026Sharti#ifdef DIAGNOSTIC 1416144026Sharti if (ipprintfs) 1417144026Sharti printf("redirect (%d) to %lx\n", code, (u_long)dest); 14181590Srgrimes#endif 1419144026Sharti } 142018730Ssteve } 1421144026Sharti 1422144026Sharti error = ip_output(m, (struct mbuf *)0, &ipforward_rt, 1423144026Sharti IP_FORWARDING, 0); 1424144026Sharti if (error) 1425144026Sharti ipstat.ips_cantforward++; 1426144026Sharti else { 142718730Ssteve ipstat.ips_forward++; 1428144026Sharti if (type) 1429144026Sharti ipstat.ips_redirectsent++; 1430144026Sharti else { 1431144026Sharti if (mcopy) { 1432144026Sharti ipflow_create(&ipforward_rt, mcopy); 1433144026Sharti m_freem(mcopy); 1434144026Sharti } 143518730Ssteve return; 1436144026Sharti } 14371590Srgrimes } 1438144026Sharti if (mcopy == NULL) 1439144026Sharti return; 1440144026Sharti destifp = NULL; 14411590Srgrimes 1442144026Sharti switch (error) { 1443144026Sharti 14441590Srgrimes case 0: /* forwarded, but need redirect */ 1445144026Sharti /* type, code set above */ 1446144026Sharti break; 1447144026Sharti 1448144026Sharti case ENETUNREACH: /* shouldn't happen, checked above */ 1449144026Sharti case EHOSTUNREACH: 1450144026Sharti case ENETDOWN: 1451144026Sharti case EHOSTDOWN: 1452144026Sharti default: 1453144026Sharti type = ICMP_UNREACH; 1454144026Sharti code = ICMP_UNREACH_HOST; 1455144026Sharti break; 1456144026Sharti 1457144026Sharti case EMSGSIZE: 1458144026Sharti type = ICMP_UNREACH; 145998509Sjmallett code = ICMP_UNREACH_NEEDFRAG; 1460144026Sharti if (ipforward_rt.ro_rt) 146198509Sjmallett destifp = ipforward_rt.ro_rt->rt_ifp; 1462144026Sharti ipstat.ips_cantfrag++; 1463144026Sharti break; 1464144026Sharti 1465144026Sharti case ENOBUFS: 1466144026Sharti type = ICMP_SOURCEQUENCH; 1467144026Sharti code = 0; 1468142457Sharti break; 1469144026Sharti } 14701590Srgrimes icmp_error(mcopy, type, code, dest, destifp); 1471144026Sharti} 14721590Srgrimes 1473144026Shartivoid 1474144026Shartiip_savecontrol(inp, mp, ip, m) 14751590Srgrimes register struct inpcb *inp; 1476144026Sharti register struct mbuf **mp; 1477144026Sharti register struct ip *ip; 1478144026Sharti register struct mbuf *m; 1479144026Sharti{ 1480144026Sharti if (inp->inp_socket->so_options & SO_TIMESTAMP) { 1481144026Sharti struct timeval tv; 1482144026Sharti 1483144026Sharti microtime(&tv); 14841590Srgrimes *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1485144026Sharti SCM_TIMESTAMP, SOL_SOCKET); 1486144026Sharti if (*mp) 1487144026Sharti mp = &(*mp)->m_next; 1488144026Sharti } 1489144026Sharti if (inp->inp_flags & INP_RECVDSTADDR) { 1490144026Sharti *mp = sbcreatecontrol((caddr_t) &ip->ip_dst, 1491144026Sharti sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1492144026Sharti if (*mp) 1493144026Sharti mp = &(*mp)->m_next; 1494144026Sharti } 14951590Srgrimes#ifdef notyet 1496144026Sharti /* XXX 1497144026Sharti * Moving these out of udp_input() made them even more broken 1498144026Sharti * than they already were. 1499144026Sharti */ 1500144026Sharti /* options were tossed already */ 1501144026Sharti if (inp->inp_flags & INP_RECVOPTS) { 1502144026Sharti *mp = sbcreatecontrol((caddr_t) opts_deleted_above, 1503144026Sharti sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1504144026Sharti if (*mp) 1505144026Sharti mp = &(*mp)->m_next; 1506144026Sharti } 1507144026Sharti /* ip_srcroute doesn't do what we want here, need to fix */ 1508144026Sharti if (inp->inp_flags & INP_RECVRETOPTS) { 1509144026Sharti *mp = sbcreatecontrol((caddr_t) ip_srcroute(), 1510144026Sharti sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1511144026Sharti if (*mp) 15121590Srgrimes mp = &(*mp)->m_next; 15131590Srgrimes } 15141590Srgrimes#endif 15151590Srgrimes if (inp->inp_flags & INP_RECVIF) { 15161590Srgrimes struct ifnet *ifp; 15171590Srgrimes struct sdlbuf { 15181590Srgrimes struct sockaddr_dl sdl; 15191590Srgrimes u_char pad[32]; 15201590Srgrimes } sdlbuf; 15211590Srgrimes struct sockaddr_dl *sdp; 15221590Srgrimes struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 15235814Sjkh 15241590Srgrimes if (((ifp = m->m_pkthdr.rcvif)) 15251590Srgrimes && ( ifp->if_index && (ifp->if_index <= if_index))) { 15261590Srgrimes sdp = (struct sockaddr_dl *)(ifnet_addrs 15271590Srgrimes [ifp->if_index - 1]->ifa_addr); 15281590Srgrimes /* 15291590Srgrimes * Change our mind and don't try copy. 15305814Sjkh */ 1531104696Sjmallett if ((sdp->sdl_family != AF_LINK) 15321590Srgrimes || (sdp->sdl_len > sizeof(sdlbuf))) { 1533144026Sharti goto makedummy; 1534138232Sharti } 1535144026Sharti bcopy(sdp, sdl2, sdp->sdl_len); 1536144026Sharti } else { 1537144026Shartimakedummy: 15381590Srgrimes sdl2->sdl_len 15391590Srgrimes = offsetof(struct sockaddr_dl, sdl_data[0]); 15401590Srgrimes sdl2->sdl_family = AF_LINK; 15411590Srgrimes sdl2->sdl_index = 0; 15421590Srgrimes sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 15431590Srgrimes } 15441590Srgrimes *mp = sbcreatecontrol((caddr_t) sdl2, sdl2->sdl_len, 15451590Srgrimes IP_RECVIF, IPPROTO_IP); 15461590Srgrimes if (*mp) 15471590Srgrimes mp = &(*mp)->m_next; 15481590Srgrimes } 15491590Srgrimes} 15501590Srgrimes 15511590Srgrimesint 15521590Srgrimesip_rsvp_init(struct socket *so) 15531590Srgrimes{ 15541590Srgrimes if (so->so_type != SOCK_RAW || 1555138232Sharti so->so_proto->pr_protocol != IPPROTO_RSVP) 15561590Srgrimes return EOPNOTSUPP; 1557138232Sharti 1558144026Sharti if (ip_rsvpd != NULL) 15591590Srgrimes return EADDRINUSE; 15601590Srgrimes 15611590Srgrimes ip_rsvpd = so; 15621590Srgrimes /* 15631590Srgrimes * This may seem silly, but we need to be sure we don't over-increment 15641590Srgrimes * the RSVP counter, in case something slips up. 15658874Srgrimes */ 15661590Srgrimes if (!ip_rsvp_on) { 15671590Srgrimes ip_rsvp_on = 1; 15681590Srgrimes rsvp_on++; 15691590Srgrimes } 1570126824Sru 1571126824Sru return 0; 15721590Srgrimes} 15731590Srgrimes 15741590Srgrimesint 1575126824Sruip_rsvp_done(void) 15761590Srgrimes{ 15771590Srgrimes ip_rsvpd = NULL; 1578144026Sharti /* 15791590Srgrimes * This may seem silly, but we need to be sure we don't over-decrement 1580144341Sharti * the RSVP counter, in case something slips up. 15811590Srgrimes */ 15821590Srgrimes if (ip_rsvp_on) { 15831590Srgrimes ip_rsvp_on = 0; 15841590Srgrimes rsvp_on--; 15851590Srgrimes } 15861590Srgrimes return 0; 15871590Srgrimes} 15888874Srgrimes