Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/netinet/ip_input.c,v rcsdiff: /ftp/cvs/cvsroot/src/sys/netinet/ip_input.c,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.11 retrieving revision 1.29 diff -u -p -r1.11 -r1.29 --- src/sys/netinet/ip_input.c 1994/02/02 05:59:04 1.11 +++ src/sys/netinet/ip_input.c 1996/02/26 23:17:06 1.29 @@ -1,6 +1,8 @@ +/* $NetBSD: ip_input.c,v 1.29 1996/02/26 23:17:06 mrg Exp $ */ + /* - * Copyright (c) 1982, 1986, 1988 Regents of the University of California. - * All rights reserved. + * Copyright (c) 1982, 1986, 1988, 1993 + * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -30,8 +32,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * from: @(#)ip_input.c 7.19 (Berkeley) 5/25/91 - * $Id: ip_input.c,v 1.11 1994/02/02 05:59:04 hpeyerl Exp $ + * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 */ #include @@ -44,6 +45,10 @@ #include #include #include +#include + +#include +#include #include #include @@ -55,7 +60,6 @@ #include #include #include -#include #ifndef IPFORWARDING #ifdef GATEWAY @@ -67,8 +71,25 @@ #ifndef IPSENDREDIRECTS #define IPSENDREDIRECTS 1 #endif +#ifndef IPFORWSRCRT +#define IPFORWSRCRT 1 /* allow source-routed packets */ +#endif +/* + * Note: DIRECTED_BROADCAST is handled this way so that previous + * configuration using this option will Just Work. + */ +#ifndef IPDIRECTEDBCAST +#ifdef DIRECTED_BROADCAST +#define IPDIRECTEDBCAST 1 +#else +#define IPDIRECTEDBCAST 0 +#endif /* DIRECTED_BROADCAST */ +#endif /* IPDIRECTEDBCAST */ int ipforwarding = IPFORWARDING; int ipsendredirects = IPSENDREDIRECTS; +int ip_defttl = IPDEFTTL; +int ip_forwsrcrt = IPFORWSRCRT; +int ip_directedbcast = IPDIRECTEDBCAST; #ifdef DIAGNOSTIC int ipprintfs = 0; #endif @@ -77,7 +98,8 @@ extern struct domain inetdomain; extern struct protosw inetsw[]; u_char ip_protox[IPPROTO_MAX]; int ipqmaxlen = IFQ_MAXLEN; -struct in_ifaddr *in_ifaddr; /* first inet address */ +struct in_ifaddrhead in_ifaddr; +struct ifqueue ipintrq; /* * We need to save the IP options in case a protocol wants to respond @@ -94,14 +116,7 @@ static struct ip_srcrt { struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; } ip_srcrt; -#ifdef GATEWAY -extern int if_index; -u_long *ip_ifmatrix; -#endif - -static void ip_forward __P((struct mbuf *, int)); -static void save_rte __P((u_char *, struct in_addr)); - +static void save_rte __P((u_char *, struct in_addr)); /* * IP initialization: fill in IP protocol switch table. * All protocols not implemented in kernel go to raw IP protocol handler. @@ -122,17 +137,12 @@ ip_init() if (pr->pr_domain->dom_family == PF_INET && pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) ip_protox[pr->pr_protocol] = pr - inetsw; - ipq.next = ipq.prev = &ipq; + LIST_INIT(&ipq); ip_id = time.tv_sec & 0xffff; ipintrq.ifq_maxlen = ipqmaxlen; -#ifdef GATEWAY - i = (if_index + 1) * (if_index + 1) * sizeof (u_long); - if ((ip_ifmatrix = (u_long *) malloc(i, M_RTABLE, M_WAITOK)) == 0) - panic("no memory for ip_ifmatrix"); -#endif + TAILQ_INIT(&in_ifaddr); } -struct ip *ip_reass(); struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; struct route ipforward_rt; @@ -147,14 +157,9 @@ ipintr() register struct mbuf *m; register struct ipq *fp; register struct in_ifaddr *ia; - int hlen, s; -#ifdef PARANOID - static int busy = 0; - - if (busy) - panic("ipintr: called recursively\n"); - ++busy; -#endif + struct ipqent *ipqe; + int hlen, mff, s; + next: /* * Get next datagram off input queue and get IP header @@ -163,12 +168,8 @@ next: s = splimp(); IF_DEQUEUE(&ipintrq, m); splx(s); - if (m == 0) { -#ifdef PARANOID - --busy; -#endif + if (m == 0) return; - } #ifdef DIAGNOSTIC if ((m->m_flags & M_PKTHDR) == 0) panic("ipintr no HDR"); @@ -177,7 +178,7 @@ next: * If no IP addresses have been set yet but the interfaces * are receiving, can't do anything with incoming packets yet. */ - if (in_ifaddr == NULL) + if (in_ifaddr.tqh_first == 0) goto bad; ipstat.ips_total++; if (m->m_len < sizeof (struct ip) && @@ -186,6 +187,10 @@ next: goto next; } ip = mtod(m, struct ip *); + if (ip->ip_v != IPVERSION) { + ipstat.ips_badvers++; + goto bad; + } hlen = ip->ip_hl << 2; if (hlen < sizeof(struct ip)) { /* minimum header length */ ipstat.ips_badhlen++; @@ -198,7 +203,7 @@ next: } ip = mtod(m, struct ip *); } - if (ip->ip_sum = in_cksum(m, hlen)) { + if ((ip->ip_sum = in_cksum(m, hlen)) != 0) { ipstat.ips_badsum++; goto bad; } @@ -245,35 +250,24 @@ next: /* * Check our list of addresses, to see if the packet is for us. */ - for (ia = in_ifaddr; ia; ia = ia->ia_next) { -#define satosin(sa) ((struct sockaddr_in *)(sa)) - - if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr) + for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) { + if (ip->ip_dst.s_addr == ia->ia_addr.sin_addr.s_addr) goto ours; - if ( -#ifdef DIRECTED_BROADCAST - ia->ia_ifp == m->m_pkthdr.rcvif && -#endif + if (((ip_directedbcast == 0) || (ip_directedbcast && + ia->ia_ifp == m->m_pkthdr.rcvif)) && (ia->ia_ifp->if_flags & IFF_BROADCAST)) { - u_long t; - - if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == - ip->ip_dst.s_addr) - goto ours; - if (ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr) - goto ours; - /* - * Look for all-0's host part (old broadcast addr), - * either for subnet or net. - */ - t = ntohl(ip->ip_dst.s_addr); - if (t == ia->ia_subnet) - goto ours; - if (t == ia->ia_net) + if (ip->ip_dst.s_addr == ia->ia_broadaddr.sin_addr.s_addr || + ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr || + /* + * Look for all-0's host part (old broadcast addr), + * either for subnet or net. + */ + ip->ip_dst.s_addr == ia->ia_subnet || + ip->ip_dst.s_addr == ia->ia_net) goto ours; } } - if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { + if (IN_MULTICAST(ip->ip_dst.s_addr)) { struct in_multi *inm; #ifdef MROUTING extern struct socket *ip_mrouter; @@ -300,7 +294,8 @@ next: * ip_output().) */ ip->ip_id = htons(ip->ip_id); - if (ip_mforward(ip, m->m_pkthdr.rcvif, m) != 0) { + if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { + ipstat.ips_cantforward++; m_freem(m); goto next; } @@ -313,6 +308,7 @@ next: */ if (ip->ip_p == IPPROTO_IGMP) goto ours; + ipstat.ips_forward++; } #endif /* @@ -321,14 +317,14 @@ next: */ IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); if (inm == NULL) { + ipstat.ips_cantforward++; m_freem(m); goto next; } goto ours; } - if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) - goto ours; - if (ip->ip_dst.s_addr == INADDR_ANY) + if (ip->ip_dst.s_addr == INADDR_BROADCAST || + ip->ip_dst.s_addr == INADDR_ANY) goto ours; /* @@ -361,7 +357,7 @@ ours: * Look for queue of fragments * of this datagram. */ - for (fp = ipq.next; fp != &ipq; fp = fp->next) + for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next) if (ip->ip_id == fp->ipq_id && ip->ip_src.s_addr == fp->ipq_src.s_addr && ip->ip_dst.s_addr == fp->ipq_dst.s_addr && @@ -372,13 +368,21 @@ found: /* * Adjust ip_len to not reflect header, - * set ip_mff if more fragments are expected, + * set ipqe_mff if more fragments are expected, * convert offset of this to bytes. */ ip->ip_len -= hlen; - ((struct ipasfrag *)ip)->ipf_mff = 0; - if (ip->ip_off & IP_MF) - ((struct ipasfrag *)ip)->ipf_mff = 1; + mff = (ip->ip_off & IP_MF) != 0; + if (mff) { + /* + * Make sure that fragments have a data length + * that's a non-zero multiple of 8 bytes. + */ + if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) { + ipstat.ips_badfrags++; + goto bad; + } + } ip->ip_off <<= 3; /* @@ -386,13 +390,20 @@ found: * or if this is not the first fragment, * attempt reassembly; if it succeeds, proceed. */ - if (((struct ipasfrag *)ip)->ipf_mff || ip->ip_off) { + if (mff || ip->ip_off) { ipstat.ips_fragments++; - ip = ip_reass((struct ipasfrag *)ip, fp); + MALLOC(ipqe, struct ipqent *, sizeof (struct ipqent), + M_IPQ, M_NOWAIT); + if (ipqe == NULL) { + ipstat.ips_rcvmemdrop++; + goto bad; + } + ipqe->ipqe_mff = mff; + ipqe->ipqe_ip = ip; + ip = ip_reass(ipqe, fp); if (ip == 0) goto next; - else - ipstat.ips_reassembled++; + ipstat.ips_reassembled++; m = dtom(ip); } else if (fp) @@ -418,14 +429,15 @@ bad: * is given as fp; otherwise have to make a chain. */ struct ip * -ip_reass(ip, fp) - register struct ipasfrag *ip; +ip_reass(ipqe, fp) + register struct ipqent *ipqe; register struct ipq *fp; { - register struct mbuf *m = dtom(ip); - register struct ipasfrag *q; + register struct mbuf *m = dtom(ipqe->ipqe_ip); + register struct ipqent *nq, *p, *q; + struct ip *ip; struct mbuf *t; - int hlen = ip->ip_hl << 2; + int hlen = ipqe->ipqe_ip->ip_hl << 2; int i, next; /* @@ -442,22 +454,23 @@ ip_reass(ip, fp) if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL) goto dropfrag; fp = mtod(t, struct ipq *); - insque(fp, &ipq); + LIST_INSERT_HEAD(&ipq, fp, ipq_q); fp->ipq_ttl = IPFRAGTTL; - fp->ipq_p = ip->ip_p; - fp->ipq_id = ip->ip_id; - fp->ipq_next = fp->ipq_prev = (struct ipasfrag *)fp; - fp->ipq_src = ((struct ip *)ip)->ip_src; - fp->ipq_dst = ((struct ip *)ip)->ip_dst; - q = (struct ipasfrag *)fp; + fp->ipq_p = ipqe->ipqe_ip->ip_p; + fp->ipq_id = ipqe->ipqe_ip->ip_id; + LIST_INIT(&fp->ipq_fragq); + fp->ipq_src = ipqe->ipqe_ip->ip_src; + fp->ipq_dst = ipqe->ipqe_ip->ip_dst; + p = NULL; goto insert; } /* * Find a segment which begins after this one does. */ - for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) - if (q->ip_off > ip->ip_off) + for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL; + p = q, q = q->ipqe_q.le_next) + if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off) break; /* @@ -465,14 +478,15 @@ ip_reass(ip, fp) * our data already. If so, drop the data from the incoming * segment. If it provides all of our data, drop us. */ - if (q->ipf_prev != (struct ipasfrag *)fp) { - i = q->ipf_prev->ip_off + q->ipf_prev->ip_len - ip->ip_off; + if (p != NULL) { + i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len - + ipqe->ipqe_ip->ip_off; if (i > 0) { - if (i >= ip->ip_len) + if (i >= ipqe->ipqe_ip->ip_len) goto dropfrag; - m_adj(dtom(ip), i); - ip->ip_off += i; - ip->ip_len -= i; + m_adj(dtom(ipqe->ipqe_ip), i); + ipqe->ipqe_ip->ip_off += i; + ipqe->ipqe_ip->ip_len -= i; } } @@ -480,17 +494,20 @@ ip_reass(ip, fp) * While we overlap succeeding segments trim them or, * if they are completely covered, dequeue them. */ - while (q != (struct ipasfrag *)fp && ip->ip_off + ip->ip_len > q->ip_off) { - i = (ip->ip_off + ip->ip_len) - q->ip_off; - if (i < q->ip_len) { - q->ip_len -= i; - q->ip_off += i; - m_adj(dtom(q), i); + for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len > + q->ipqe_ip->ip_off; q = nq) { + i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) - + q->ipqe_ip->ip_off; + if (i < q->ipqe_ip->ip_len) { + q->ipqe_ip->ip_len -= i; + q->ipqe_ip->ip_off += i; + m_adj(dtom(q->ipqe_ip), i); break; } - q = q->ipf_next; - m_freem(dtom(q->ipf_prev)); - ip_deq(q->ipf_prev); + nq = q->ipqe_q.le_next; + m_freem(dtom(q->ipqe_ip)); + LIST_REMOVE(q, ipqe_q); + FREE(q, M_IPQ); } insert: @@ -498,28 +515,36 @@ insert: * Stick new segment in its place; * check for complete reassembly. */ - ip_enq(ip, q->ipf_prev); + if (p == NULL) { + LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q); + } else { + LIST_INSERT_AFTER(p, ipqe, ipqe_q); + } next = 0; - for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) { - if (q->ip_off != next) + for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL; + p = q, q = q->ipqe_q.le_next) { + if (q->ipqe_ip->ip_off != next) return (0); - next += q->ip_len; + next += q->ipqe_ip->ip_len; } - if (q->ipf_prev->ipf_mff) + if (p->ipqe_mff) return (0); /* * Reassembly is complete; concatenate fragments. */ - q = fp->ipq_next; - m = dtom(q); + q = fp->ipq_fragq.lh_first; + ip = q->ipqe_ip; + m = dtom(q->ipqe_ip); t = m->m_next; m->m_next = 0; m_cat(m, t); - q = q->ipf_next; - while (q != (struct ipasfrag *)fp) { - t = dtom(q); - q = q->ipf_next; + nq = q->ipqe_q.le_next; + FREE(q, M_IPQ); + for (q = nq; q != NULL; q = nq) { + t = dtom(q->ipqe_ip); + nq = q->ipqe_q.le_next; + FREE(q, M_IPQ); m_cat(m, t); } @@ -529,13 +554,11 @@ insert: * dequeue and discard fragment reassembly header. * Make header visible. */ - ip = fp->ipq_next; ip->ip_len = next; - ((struct ip *)ip)->ip_src = fp->ipq_src; - ((struct ip *)ip)->ip_dst = fp->ipq_dst; - remque(fp); + ip->ip_src = fp->ipq_src; + ip->ip_dst = fp->ipq_dst; + LIST_REMOVE(fp, ipq_q); (void) m_free(dtom(fp)); - m = dtom(ip); m->m_len += (ip->ip_hl << 2); m->m_data -= (ip->ip_hl << 2); /* some debugging cruft by sklower, below, will go away soon */ @@ -545,11 +568,12 @@ insert: plen += m->m_len; t->m_pkthdr.len = plen; } - return ((struct ip *)ip); + return (ip); dropfrag: ipstat.ips_fragdropped++; m_freem(m); + FREE(ipqe, M_IPQ); return (0); } @@ -561,45 +585,19 @@ void ip_freef(fp) struct ipq *fp; { - register struct ipasfrag *q, *p; + register struct ipqent *q, *p; - for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = p) { - p = q->ipf_next; - ip_deq(q); - m_freem(dtom(q)); + for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) { + p = q->ipqe_q.le_next; + m_freem(dtom(q->ipqe_ip)); + LIST_REMOVE(q, ipqe_q); + FREE(q, M_IPQ); } - remque(fp); + LIST_REMOVE(fp, ipq_q); (void) m_free(dtom(fp)); } /* - * Put an ip fragment on a reassembly chain. - * Like insque, but pointers in middle of structure. - */ -void -ip_enq(p, prev) - register struct ipasfrag *p, *prev; -{ - - p->ipf_prev = prev; - p->ipf_next = prev->ipf_next; - prev->ipf_next->ipf_prev = p; - prev->ipf_next = p; -} - -/* - * To ip_enq as remque is to insque. - */ -void -ip_deq(p) - register struct ipasfrag *p; -{ - - p->ipf_prev->ipf_next = p->ipf_next; - p->ipf_next->ipf_prev = p->ipf_prev; -} - -/* * IP timer processing; * if a timer expires on a reassembly * queue, discard it. @@ -607,20 +605,14 @@ ip_deq(p) void ip_slowtimo() { - register struct ipq *fp; - int s = splnet(); + register struct ipq *fp, *nfp; + int s = splsoftnet(); - fp = ipq.next; - if (fp == 0) { - splx(s); - return; - } - while (fp != &ipq) { - --fp->ipq_ttl; - fp = fp->next; - if (fp->prev->ipq_ttl == 0) { + for (fp = ipq.lh_first; fp != NULL; fp = nfp) { + nfp = fp->ipq_q.le_next; + if (--fp->ipq_ttl == 0) { ipstat.ips_fragtimeout++; - ip_freef(fp->prev); + ip_freef(fp); } } splx(s); @@ -633,15 +625,12 @@ void ip_drain() { - while (ipq.next != &ipq) { + while (ipq.lh_first != NULL) { ipstat.ips_fragdropped++; - ip_freef(ipq.next); + ip_freef(ipq.lh_first); } } -extern struct in_ifaddr *ifptoia(); -struct in_ifaddr *ip_rtaddr(); - /* * Do option processing on a datagram, * possibly discarding it if bad options are encountered, @@ -658,9 +647,10 @@ ip_dooptions(m) register struct ip_timestamp *ipt; register struct in_ifaddr *ia; int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; - struct in_addr *sin; + struct in_addr *sin, dst; n_time ntime; + dst = ip->ip_dst; cp = (u_char *)(ip + 1); cnt = (ip->ip_hl << 2) - sizeof (struct ip); for (; cnt > 0; cnt -= optlen, cp += optlen) { @@ -697,8 +687,7 @@ ip_dooptions(m) goto bad; } ipaddr.sin_addr = ip->ip_dst; - ia = (struct in_ifaddr *) - ifa_ifwithaddr((struct sockaddr *)&ipaddr); + ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); if (ia == 0) { if (opt == IPOPT_SSRR) { type = ICMP_UNREACH; @@ -727,8 +716,7 @@ ip_dooptions(m) if (opt == IPOPT_SSRR) { #define INA struct in_ifaddr * #define SA struct sockaddr * - if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) - ia = in_iaonnetof(in_netof(ipaddr.sin_addr)); + ia = (INA)ifa_ifwithladdr((SA)&ipaddr); } else ia = ip_rtaddr(ipaddr.sin_addr); if (ia == 0) { @@ -737,10 +725,13 @@ ip_dooptions(m) goto bad; } ip->ip_dst = ipaddr.sin_addr; - bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), + bcopy((caddr_t)&ia->ia_addr.sin_addr, (caddr_t)(cp + off), sizeof(struct in_addr)); cp[IPOPT_OFFSET] += sizeof(struct in_addr); - forward = 1; + /* + * Let ip_intr's mcast routing check handle mcast pkts + */ + forward = !IN_MULTICAST(ip->ip_dst.s_addr); break; case IPOPT_RR: @@ -766,7 +757,7 @@ ip_dooptions(m) code = ICMP_UNREACH_HOST; goto bad; } - bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), + bcopy((caddr_t)&ia->ia_addr.sin_addr, (caddr_t)(cp + off), sizeof(struct in_addr)); cp[IPOPT_OFFSET] += sizeof(struct in_addr); break; @@ -776,7 +767,7 @@ ip_dooptions(m) ipt = (struct ip_timestamp *)cp; if (ipt->ipt_len < 5) goto bad; - if (ipt->ipt_ptr > ipt->ipt_len - sizeof (long)) { + if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { if (++ipt->ipt_oflw == 0) goto bad; break; @@ -791,8 +782,12 @@ ip_dooptions(m) if (ipt->ipt_ptr + sizeof(n_time) + sizeof(struct in_addr) > ipt->ipt_len) goto bad; - ia = ifptoia(m->m_pkthdr.rcvif); - bcopy((caddr_t)&IA_SIN(ia)->sin_addr, + ipaddr.sin_addr = dst; + ia = (INA)ifaof_ifpforaddr((SA)&ipaddr, + m->m_pkthdr.rcvif); + if (ia == 0) + continue; + bcopy((caddr_t)&ia->ia_addr.sin_addr, (caddr_t)sin, sizeof(struct in_addr)); ipt->ipt_ptr += sizeof(struct in_addr); break; @@ -818,15 +813,19 @@ ip_dooptions(m) } } if (forward) { + if (ip_forwsrcrt == 0) { + type = ICMP_UNREACH; + code = ICMP_UNREACH_SRCFAIL; + goto bad; + } ip_forward(m, 1); return (1); - } else - return (0); + } + return (0); bad: - { - register struct in_addr foo = {}; - icmp_error(m, type, code, foo); - } + ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */ + icmp_error(m, type, code, 0, 0); + ipstat.ips_badoptions++; return (1); } @@ -840,7 +839,7 @@ ip_rtaddr(dst) { register struct sockaddr_in *sin; - sin = (struct sockaddr_in *) &ipforward_rt.ro_dst; + sin = satosin(&ipforward_rt.ro_dst); if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) { if (ipforward_rt.ro_rt) { @@ -855,14 +854,14 @@ ip_rtaddr(dst) } if (ipforward_rt.ro_rt == 0) return ((struct in_ifaddr *)0); - return ((struct in_ifaddr *) ipforward_rt.ro_rt->rt_ifa); + return (ifatoia(ipforward_rt.ro_rt->rt_ifa)); } /* * Save incoming source route for use in replies, * to be picked up later by ip_srcroute if the receiver is interested. */ -static void +void save_rte(option, dst) u_char *option; struct in_addr dst; @@ -898,7 +897,7 @@ ip_srcroute() if (m == 0) return ((struct mbuf *)0); -#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) +#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + @@ -977,7 +976,7 @@ ip_stripoptions(m, mopt) ip->ip_hl = sizeof(struct ip) >> 2; } -u_char inetctlerrmap[PRC_NCMDS] = { +int inetctlerrmap[PRC_NCMDS] = { 0, 0, 0, 0, 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, @@ -1000,7 +999,7 @@ u_char inetctlerrmap[PRC_NCMDS] = { * The srcrt parameter indicates whether the packet is being forwarded * via a source route. */ -static void +void ip_forward(m, srcrt) struct mbuf *m; int srcrt; @@ -1008,15 +1007,16 @@ ip_forward(m, srcrt) register struct ip *ip = mtod(m, struct ip *); register struct sockaddr_in *sin; register struct rtentry *rt; - int error, type = 0, code; + int error, type = 0, code = 0; struct mbuf *mcopy; - struct in_addr dest; + n_long dest; + struct ifnet *destifp; - dest.s_addr = 0; + dest = 0; #ifdef DIAGNOSTIC if (ipprintfs) - printf("forward: src %x dst %x ttl %x\n", ip->ip_src, - ip->ip_dst, ip->ip_ttl); + printf("forward: src %x dst %x ttl %x\n", + ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl); #endif if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { ipstat.ips_cantforward++; @@ -1025,12 +1025,12 @@ ip_forward(m, srcrt) } HTONS(ip->ip_id); if (ip->ip_ttl <= IPTTLDEC) { - icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest); + icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); return; } ip->ip_ttl -= IPTTLDEC; - sin = (struct sockaddr_in *)&ipforward_rt.ro_dst; + sin = satosin(&ipforward_rt.ro_dst); if ((rt = ipforward_rt.ro_rt) == 0 || ip->ip_dst.s_addr != sin->sin_addr.s_addr) { if (ipforward_rt.ro_rt) { @@ -1043,7 +1043,7 @@ ip_forward(m, srcrt) rtalloc(&ipforward_rt); if (ipforward_rt.ro_rt == 0) { - icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest); + icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); return; } rt = ipforward_rt.ro_rt; @@ -1055,10 +1055,6 @@ ip_forward(m, srcrt) */ mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64)); -#ifdef GATEWAY - ip_ifmatrix[rt->rt_ifp->if_index + - if_index * m->m_pkthdr.rcvif->if_index]++; -#endif /* * If forwarding packet using same interface that it came in on, * perhaps should send a redirect to sender to shortcut a hop. @@ -1067,49 +1063,29 @@ ip_forward(m, srcrt) * Also, don't send redirect if forwarding using a default route * or a route modified by a redirect. */ -#define satosin(sa) ((struct sockaddr_in *)(sa)) if (rt->rt_ifp == m->m_pkthdr.rcvif && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && satosin(rt_key(rt))->sin_addr.s_addr != 0 && ipsendredirects && !srcrt) { - struct in_ifaddr *ia; - u_long src = ntohl(ip->ip_src.s_addr); - u_long dst = ntohl(ip->ip_dst.s_addr); - - if ((ia = ifptoia(m->m_pkthdr.rcvif)) && - (src & ia->ia_subnetmask) == ia->ia_subnet) { + if (rt->rt_ifa && + (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == + ifatoia(rt->rt_ifa)->ia_subnet) { if (rt->rt_flags & RTF_GATEWAY) - dest = satosin(rt->rt_gateway)->sin_addr; + dest = satosin(rt->rt_gateway)->sin_addr.s_addr; else - dest = ip->ip_dst; - /* - * If the destination is reached by a route to host, - * is on a subnet of a local net, or is directly - * on the attached net (!), use host redirect. - * (We may be the correct first hop for other subnets.) - */ -#define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) + dest = ip->ip_dst.s_addr; + /* Router requirements says to only send host redirects */ type = ICMP_REDIRECT; - if ((rt->rt_flags & RTF_HOST) || - (rt->rt_flags & RTF_GATEWAY) == 0) - code = ICMP_REDIRECT_HOST; - else if (RTA(rt)->ia_subnetmask != RTA(rt)->ia_netmask && - (dst & RTA(rt)->ia_netmask) == RTA(rt)->ia_net) - code = ICMP_REDIRECT_HOST; - else - code = ICMP_REDIRECT_NET; + code = ICMP_REDIRECT_HOST; #ifdef DIAGNOSTIC if (ipprintfs) - printf("redirect (%d) to %x\n", code, dest.s_addr); + printf("redirect (%d) to %lx\n", code, (u_int32_t)dest); #endif } } - error = ip_output(m, NULL, &ipforward_rt, IP_FORWARDING -#ifdef DIRECTED_BROADCAST - | IP_ALLOWBROADCAST -#endif - , NULL); + error = ip_output(m, (struct mbuf *)0, &ipforward_rt, + (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0); if (error) ipstat.ips_cantforward++; else { @@ -1124,6 +1100,8 @@ ip_forward(m, srcrt) } if (mcopy == NULL) return; + destifp = NULL; + switch (error) { case 0: /* forwarded, but need redirect */ @@ -1142,6 +1120,8 @@ ip_forward(m, srcrt) case EMSGSIZE: type = ICMP_UNREACH; code = ICMP_UNREACH_NEEDFRAG; + if (ipforward_rt.ro_rt) + destifp = ipforward_rt.ro_rt->rt_ifp; ipstat.ips_cantfrag++; break; @@ -1150,5 +1130,47 @@ ip_forward(m, srcrt) code = 0; break; } - icmp_error(mcopy, type, code, dest); + icmp_error(mcopy, type, code, dest, destifp); +} + +int +ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen) + int *name; + u_int namelen; + void *oldp; + size_t *oldlenp; + void *newp; + size_t newlen; +{ + /* All sysctl names at this level are terminal. */ + if (namelen != 1) + return (ENOTDIR); + + switch (name[0]) { + case IPCTL_FORWARDING: + return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding)); + case IPCTL_SENDREDIRECTS: + return (sysctl_int(oldp, oldlenp, newp, newlen, + &ipsendredirects)); + case IPCTL_DEFTTL: + return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl)); +#ifdef notyet + case IPCTL_DEFMTU: + return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu)); +#endif + case IPCTL_FORWSRCRT: + /* + * Don't allow this to change in a secure environment. + */ + if (securelevel > 0) + return (EPERM); + return (sysctl_int(oldp, oldlenp, newp, newlen, + &ip_forwsrcrt)); + case IPCTL_DIRECTEDBCAST: + return (sysctl_int(oldp, oldlenp, newp, newlen, + &ip_directedbcast)); + default: + return (EOPNOTSUPP); + } + /* NOTREACHED */ }