diff options
Diffstat (limited to 'sys/netinet6/ip6_input.c')
| -rw-r--r-- | sys/netinet6/ip6_input.c | 1016 |
1 files changed, 1016 insertions, 0 deletions
diff --git a/sys/netinet6/ip6_input.c b/sys/netinet6/ip6_input.c new file mode 100644 index 0000000..dc12b0f --- /dev/null +++ b/sys/netinet6/ip6_input.c @@ -0,0 +1,1016 @@ +/* + * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the project nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * 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 + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 + */ + +#include "opt_ip6fw.h" +#include "opt_inet.h" +#include "opt_ipsec.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/domain.h> +#include <sys/protosw.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#include <sys/errno.h> +#include <sys/time.h> +#include <sys/kernel.h> +#include <sys/syslog.h> +#include <sys/proc.h> + +#include <net/if.h> +#include <net/if_types.h> +#include <net/if_dl.h> +#include <net/route.h> +#include <net/netisr.h> + +#include <netinet/in.h> +#include <netinet/in_systm.h> +#ifdef INET +#include <netinet/ip.h> +#include <netinet/ip_icmp.h> +#endif /*INET*/ +#include <netinet/in_pcb.h> +#include <netinet6/in6_var.h> +#include <netinet6/ip6.h> +#include <netinet6/ip6_var.h> +#include <netinet6/icmp6.h> +#include <netinet6/in6_ifattach.h> +#include <netinet6/nd6.h> +#include <netinet6/in6_prefix.h> + +#ifdef IPV6FIREWALL +#include <netinet6/ip6_fw.h> +#endif + +#ifdef ALTQ +#include <netinet/altq_cdnr.h> +#endif + +#include <netinet6/ip6protosw.h> + +/* we need it for NLOOP. */ +#include "loop.h" +/* #include "faith.h" */ + +/* #include "gif.h" */ + +#include <net/net_osdep.h> + +extern struct domain inet6domain; +extern struct ip6protosw inet6sw[]; + +u_char ip6_protox[IPPROTO_MAX]; +static int ip6qmaxlen = IFQ_MAXLEN; +struct in6_ifaddr *in6_ifaddr; +struct ifqueue ip6intrq; + +int ip6_forward_srcrt; /* XXX */ +int ip6_sourcecheck; /* XXX */ +int ip6_sourcecheck_interval; /* XXX */ + +#ifdef IPV6FIREWALL +/* firewall hooks */ +ip6_fw_chk_t *ip6_fw_chk_ptr; +ip6_fw_ctl_t *ip6_fw_ctl_ptr; +#endif + +struct ip6stat ip6stat; + +static void ip6_init2 __P((void *)); + +static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); + +#if defined(PTR) +extern int ip6_protocol_tr; + +int ptr_in6 __P((struct mbuf *, struct mbuf **)); +extern void ip_forward __P((struct mbuf *, int)); +#endif + +/* + * IP6 initialization: fill in IP6 protocol switch table. + * All protocols not implemented in kernel go to raw IP6 protocol handler. + */ +void +ip6_init() +{ + register struct ip6protosw *pr; + register int i; + struct timeval tv; + + pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); + if (pr == 0) + panic("ip6_init"); + for (i = 0; i < IPPROTO_MAX; i++) + ip6_protox[i] = pr - inet6sw; + for (pr = (struct ip6protosw *)inet6domain.dom_protosw; + pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) + if (pr->pr_domain->dom_family == PF_INET6 && + pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) + ip6_protox[pr->pr_protocol] = pr - inet6sw; + ip6intrq.ifq_maxlen = ip6qmaxlen; + nd6_init(); + frag6_init(); +#ifdef IPV6FIREWALL + ip6_fw_init(); +#endif + /* + * in many cases, random() here does NOT return random number + * as initialization during bootstrap time occur in fixed order. + */ + microtime(&tv); + ip6_flow_seq = random() ^ tv.tv_usec; +} + +static void +ip6_init2(dummy) + void *dummy; +{ + int i; + int ret; + + /* get EUI64 from somewhere */ + ret = in6_ifattach_getifid(NULL); + + /* + * to route local address of p2p link to loopback, + * assign loopback address first. + */ + for (i = 0; i < NLOOP; i++) + in6_ifattach(&loif[i], IN6_IFT_LOOP, NULL, 0); + + /* attach pseudo interfaces */ + if (ret == 0) + in6_ifattach_p2p(); + + /* nd6_timer_init */ + timeout(nd6_timer, (caddr_t)0, hz); + /* router renumbering prefix list maintenance */ + timeout(in6_rr_timer, (caddr_t)0, hz); +} + +/* cheat */ +SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init2, NULL); + +/* + * IP6 input interrupt handling. Just pass the packet to ip6_input. + */ +void +ip6intr() +{ + int s; + struct mbuf *m; + + for (;;) { + s = splimp(); + IF_DEQUEUE(&ip6intrq, m); + splx(s); + if (m == 0) + return; + ip6_input(m); + } +} + +NETISR_SET(NETISR_IPV6, ip6intr); + +extern struct route_in6 ip6_forward_rt; + +void +ip6_input(m) + struct mbuf *m; +{ + struct ip6_hdr *ip6; + int off = sizeof(struct ip6_hdr), nest; + u_int32_t plen; + u_int32_t rtalert = ~0; + int nxt, ours = 0; + struct ifnet *deliverifp = NULL; + +#ifdef IPSEC + /* + * should the inner packet be considered authentic? + * see comment in ah4_input(). + */ + if (m) { + m->m_flags &= ~M_AUTHIPHDR; + m->m_flags &= ~M_AUTHIPDGM; + } +#endif + + /* + * mbuf statistics by kazu + */ + if (m->m_flags & M_EXT) { + if (m->m_next) + ip6stat.ip6s_mext2m++; + else + ip6stat.ip6s_mext1++; + } else { + if (m->m_next) { + if (m->m_flags & M_LOOP) { + ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/ + } else if (m->m_pkthdr.rcvif->if_index <= 31) + ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; + else + ip6stat.ip6s_m2m[0]++; + } else + ip6stat.ip6s_m1++; + } + + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); + ip6stat.ip6s_total++; + + IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/); + + if (m->m_len < sizeof(struct ip6_hdr)) { + struct ifnet *inifp; + inifp = m->m_pkthdr.rcvif; + if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) { + ip6stat.ip6s_toosmall++; + in6_ifstat_inc(inifp, ifs6_in_hdrerr); + return; + } + } + + ip6 = mtod(m, struct ip6_hdr *); + + if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { + ip6stat.ip6s_badvers++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); + goto bad; + } + + ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; + +#ifdef IPV6FIREWALL + /* + * Check with the firewall... + */ + if (ip6_fw_chk_ptr) { + u_short port = 0; + /* If ipfw says divert, we have to just drop packet */ + /* use port as a dummy argument */ + if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) { + m_freem(m); + m = NULL; + } + if (!m) + return; + } +#endif + +#ifdef ALTQ + if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { + /* packet is dropped by traffic conditioner */ + return; + } +#endif + + /* + * Scope check + */ + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || + IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { + ip6stat.ip6s_badscope++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); + goto bad; + } + if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || + IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { + if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { + ours = 1; + deliverifp = m->m_pkthdr.rcvif; + goto hbhcheck; + } else { + ip6stat.ip6s_badscope++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); + goto bad; + } + } + + if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { + if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) { + ours = 1; + deliverifp = m->m_pkthdr.rcvif; + goto hbhcheck; + } + } else { + if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) + ip6->ip6_src.s6_addr16[1] + = htons(m->m_pkthdr.rcvif->if_index); + if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) + ip6->ip6_dst.s6_addr16[1] + = htons(m->m_pkthdr.rcvif->if_index); + } + +#if defined(PTR) + /* + * + */ + if (ip6_protocol_tr) + { + struct mbuf *m1 = NULL; + + switch (ptr_in6(m, &m1)) + { + case IPPROTO_IP: goto mcastcheck; + case IPPROTO_IPV4: ip_forward(m1, 0); break; + case IPPROTO_IPV6: ip6_forward(m1, 0); break; + case IPPROTO_MAX: /* discard this packet */ + default: + } + + if (m != m1) + m_freem(m); + + return; + } + + mcastcheck: +#endif + + /* + * Multicast check + */ + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { + struct in6_multi *in6m = 0; + + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); + /* + * See if we belong to the destination multicast group on the + * arrival interface. + */ + IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); + if (in6m) + ours = 1; + else { + ip6stat.ip6s_notmember++; + ip6stat.ip6s_cantforward++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); + goto bad; + } + deliverifp = m->m_pkthdr.rcvif; + goto hbhcheck; + } + + /* + * Unicast check + */ + if (ip6_forward_rt.ro_rt == 0 || + !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, + &ip6_forward_rt.ro_dst.sin6_addr)) { + if (ip6_forward_rt.ro_rt) { + RTFREE(ip6_forward_rt.ro_rt); + ip6_forward_rt.ro_rt = 0; + } + bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); + ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6); + ip6_forward_rt.ro_dst.sin6_family = AF_INET6; + ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst; + + rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING); + } + +#define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) + + /* + * Accept the packet if the forwarding interface to the destination + * according to the routing table is the loopback interface, + * unless the associated route has a gateway. + * Note that this approach causes to accept a packet if there is a + * route to the loopback interface for the destination of the packet. + * But we think it's even useful in some situations, e.g. when using + * a special daemon which wants to intercept the packet. + */ + if (ip6_forward_rt.ro_rt && + (ip6_forward_rt.ro_rt->rt_flags & + (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && + /* + * The comparison of the destination and the key of the rtentry + * has already done through looking up the routing table, + * so no need to do such a comparison here again. + */ + ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { + struct in6_ifaddr *ia6 = + (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; + /* packet to tentative address must not be received */ + if (ia6->ia6_flags & IN6_IFF_ANYCAST) + m->m_flags |= M_ANYCAST6; + if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { + /* this interface is ready */ + ours = 1; + deliverifp = ia6->ia_ifp; /* correct? */ + goto hbhcheck; + } else { + /* this interface is not ready, fall through */ + } + } + + /* + * FAITH(Firewall Aided Internet Translator) + */ +#if defined(NFAITH) && 0 < NFAITH + if (ip6_keepfaith) { + if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp + && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { + /* XXX do we need more sanity checks? */ + ours = 1; + deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/ + goto hbhcheck; + } + } +#endif + + /* + * Now there is no reason to process the packet if it's not our own + * and we're not a router. + */ + if (!ip6_forwarding) { + ip6stat.ip6s_cantforward++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); + goto bad; + } + + hbhcheck: + /* + * Process Hop-by-Hop options header if it's contained. + * m may be modified in ip6_hopopts_input(). + * If a JumboPayload option is included, plen will also be modified. + */ + plen = (u_int32_t)ntohs(ip6->ip6_plen); + if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { + if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); + return; /* m have already been freed */ + } + /* adjust pointer */ + ip6 = mtod(m, struct ip6_hdr *); + nxt = ((struct ip6_hbh *)(ip6 + 1))->ip6h_nxt; + + /* + * accept the packet if a router alert option is included + * and we act as an IPv6 router. + */ + if (rtalert != ~0 && ip6_forwarding) + ours = 1; + } else + nxt = ip6->ip6_nxt; + + /* + * Check that the amount of data in the buffers + * is as at least much as the IPv6 header would have us expect. + * Trim mbufs if longer than we expect. + * Drop packet if shorter than we expect. + */ + if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { + ip6stat.ip6s_tooshort++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); + goto bad; + } + if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { + if (m->m_len == m->m_pkthdr.len) { + m->m_len = sizeof(struct ip6_hdr) + plen; + m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; + } else + m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); + } + + /* + * Forward if desirable. + */ + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { + if (!ours) { + m_freem(m); + return; + } + } else if (!ours) { + ip6_forward(m, 0); + return; + } + + /* + * Tell launch routine the next header + */ +#if defined(__NetBSD__) && defined(IFA_STATS) + if (IFA_STATS && deliverifp != NULL) { + struct in6_ifaddr *ia6; + ip6 = mtod(m, struct ip6_hdr *); + ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); + if (ia6) + ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; + } +#endif + ip6stat.ip6s_delivered++; + in6_ifstat_inc(deliverifp, ifs6_in_deliver); + nest = 0; + while (nxt != IPPROTO_DONE) { + if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { + ip6stat.ip6s_toomanyhdr++; + goto bad; + } + + /* + * protection against faulty packet - there should be + * more sanity checks in header chain processing. + */ + if (m->m_pkthdr.len < off) { + ip6stat.ip6s_tooshort++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); + goto bad; + } + + nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); + } + return; + bad: + m_freem(m); +} + +/* + * Hop-by-Hop options header processing. If a valid jumbo payload option is + * included, the real payload length will be stored in plenp. + */ +static int +ip6_hopopts_input(plenp, rtalertp, mp, offp) + u_int32_t *plenp; + u_int32_t *rtalertp; /* XXX: should be stored more smart way */ + struct mbuf **mp; + int *offp; +{ + register struct mbuf *m = *mp; + int off = *offp, hbhlen; + struct ip6_hbh *hbh; + u_int8_t *opt; + + /* validation of the length of the header */ + IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); + hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); + hbhlen = (hbh->ip6h_len + 1) << 3; + + IP6_EXTHDR_CHECK(m, off, hbhlen, -1); + hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); + off += hbhlen; + hbhlen -= sizeof(struct ip6_hbh); + opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); + + if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), + hbhlen, rtalertp, plenp) < 0) + return(-1); + + *offp = off; + *mp = m; + return(0); +} + +/* + * Search header for all Hop-by-hop options and process each option. + * This function is separate from ip6_hopopts_input() in order to + * handle a case where the sending node itself process its hop-by-hop + * options header. In such a case, the function is called from ip6_output(). + */ +int +ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) + struct mbuf *m; + u_int8_t *opthead; + int hbhlen; + u_int32_t *rtalertp; + u_int32_t *plenp; +{ + struct ip6_hdr *ip6; + int optlen = 0; + u_int8_t *opt = opthead; + u_int16_t rtalert_val; + + for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { + switch(*opt) { + case IP6OPT_PAD1: + optlen = 1; + break; + case IP6OPT_PADN: + if (hbhlen < IP6OPT_MINLEN) { + ip6stat.ip6s_toosmall++; + goto bad; + } + optlen = *(opt + 1) + 2; + break; + case IP6OPT_RTALERT: + /* XXX may need check for alignment */ + if (hbhlen < IP6OPT_RTALERT_LEN) { + ip6stat.ip6s_toosmall++; + goto bad; + } + if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) + /* XXX: should we discard the packet? */ + log(LOG_ERR, "length of router alert opt is inconsitent(%d)", + *(opt + 1)); + optlen = IP6OPT_RTALERT_LEN; + bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); + *rtalertp = ntohs(rtalert_val); + break; + case IP6OPT_JUMBO: + /* XXX may need check for alignment */ + if (hbhlen < IP6OPT_JUMBO_LEN) { + ip6stat.ip6s_toosmall++; + goto bad; + } + if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) + /* XXX: should we discard the packet? */ + log(LOG_ERR, "length of jumbopayload opt " + "is inconsistent(%d)", + *(opt + 1)); + optlen = IP6OPT_JUMBO_LEN; + + bcopy(opt + 2, plenp, sizeof(*plenp)); + *plenp = htonl(*plenp); + if (*plenp <= IPV6_MAXPACKET) { + /* + * jumbo payload length must be larger + * than 65535 + */ + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_HEADER, + sizeof(struct ip6_hdr) + + sizeof(struct ip6_hbh) + + opt + 2 - opthead); + return(-1); + } + + ip6 = mtod(m, struct ip6_hdr *); + if (ip6->ip6_plen) { + /* + * IPv6 packets that have non 0 payload length + * must not contain a jumbo paylod option. + */ + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_HEADER, + sizeof(struct ip6_hdr) + + sizeof(struct ip6_hbh) + + opt - opthead); + return(-1); + } + break; + default: /* unknown option */ + if (hbhlen < IP6OPT_MINLEN) { + ip6stat.ip6s_toosmall++; + goto bad; + } + if ((optlen = ip6_unknown_opt(opt, m, + sizeof(struct ip6_hdr) + + sizeof(struct ip6_hbh) + + opt - opthead)) == -1) + return(-1); + optlen += 2; + break; + } + } + + return(0); + + bad: + m_freem(m); + return(-1); +} + +/* + * Unknown option processing. + * The third argument `off' is the offset from the IPv6 header to the option, + * which is necessary if the IPv6 header the and option header and IPv6 header + * is not continuous in order to return an ICMPv6 error. + */ +int +ip6_unknown_opt(optp, m, off) + u_int8_t *optp; + struct mbuf *m; + int off; +{ + struct ip6_hdr *ip6; + + switch(IP6OPT_TYPE(*optp)) { + case IP6OPT_TYPE_SKIP: /* ignore the option */ + return((int)*(optp + 1)); + case IP6OPT_TYPE_DISCARD: /* silently discard */ + m_freem(m); + return(-1); + case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); + return(-1); + case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ + ip6stat.ip6s_badoptions++; + ip6 = mtod(m, struct ip6_hdr *); + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || + (m->m_flags & (M_BCAST|M_MCAST))) + m_freem(m); + else + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_OPTION, off); + return(-1); + } + + m_freem(m); /* XXX: NOTREACHED */ + return(-1); +} + +/* + * Create the "control" list for this pcb + */ +void +ip6_savecontrol(in6p, mp, ip6, m) + register struct inpcb *in6p; + register struct mbuf **mp; + register struct ip6_hdr *ip6; + register struct mbuf *m; +{ + struct proc *p = curproc; /* XXX */ + int privileged; + + privileged = 0; + if (p && !suser(p)) + privileged++; + +#ifdef SO_TIMESTAMP + if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { + struct timeval tv; + + microtime(&tv); + *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), + SCM_TIMESTAMP, SOL_SOCKET); + if (*mp) + mp = &(*mp)->m_next; + } +#endif + if (in6p->in6p_flags & IN6P_RECVDSTADDR) { + *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst, + sizeof(struct in6_addr), IPV6_RECVDSTADDR, + IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + } + + /* RFC 2292 sec. 5 */ + if (in6p->in6p_flags & IN6P_PKTINFO) { + struct in6_pktinfo pi6; + bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); + if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) + pi6.ipi6_addr.s6_addr16[1] = 0; + pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) + ? m->m_pkthdr.rcvif->if_index + : 0; + *mp = sbcreatecontrol((caddr_t) &pi6, + sizeof(struct in6_pktinfo), IPV6_PKTINFO, + IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + } + if (in6p->in6p_flags & IN6P_HOPLIMIT) { + int hlim = ip6->ip6_hlim & 0xff; + *mp = sbcreatecontrol((caddr_t) &hlim, + sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + } + /* IN6P_NEXTHOP - for outgoing packet only */ + + /* + * IPV6_HOPOPTS socket option. We require super-user privilege + * for the option, but it might be too strict, since there might + * be some hop-by-hop options which can be returned to normal user. + * See RFC 2292 section 6. + */ + if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { + /* + * Check if a hop-by-hop options header is contatined in the + * received packet, and if so, store the options as ancillary + * data. Note that a hop-by-hop options header must be + * just after the IPv6 header, which fact is assured through + * the IPv6 input processing. + */ + struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); + if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { + struct ip6_hbh *hbh = (struct ip6_hbh *)(ip6 + 1); + + /* + * XXX: We copy whole the header even if a jumbo + * payload option is included, which option is to + * be removed before returning in the RFC 2292. + * But it's too painful operation... + */ + *mp = sbcreatecontrol((caddr_t)hbh, + (hbh->ip6h_len + 1) << 3, + IPV6_HOPOPTS, IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + } + } + + /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ + if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { + struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); + int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);; + + /* + * Search for destination options headers or routing + * header(s) through the header chain, and stores each + * header as ancillary data. + * Note that the order of the headers remains in + * the chain of ancillary data. + */ + while(1) { /* is explicit loop prevention necessary? */ + struct ip6_ext *ip6e = + (struct ip6_ext *)(mtod(m, caddr_t) + off); + + switch(nxt) { + case IPPROTO_DSTOPTS: + if (!in6p->in6p_flags & IN6P_DSTOPTS) + break; + + /* + * We also require super-user privilege for + * the option. + * See the comments on IN6_HOPOPTS. + */ + if (!privileged) + break; + + *mp = sbcreatecontrol((caddr_t)ip6e, + (ip6e->ip6e_len + 1) << 3, + IPV6_DSTOPTS, + IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + break; + + case IPPROTO_ROUTING: + if (!in6p->in6p_flags & IN6P_RTHDR) + break; + + *mp = sbcreatecontrol((caddr_t)ip6e, + (ip6e->ip6e_len + 1) << 3, + IPV6_RTHDR, + IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + break; + + case IPPROTO_UDP: + case IPPROTO_TCP: + case IPPROTO_ICMPV6: + default: + /* + * stop search if we encounter an upper + * layer protocol headers. + */ + goto loopend; + + case IPPROTO_HOPOPTS: + case IPPROTO_AH: /* is it possible? */ + break; + } + + /* proceed with the next header. */ + if (nxt == IPPROTO_AH) + off += (ip6e->ip6e_len + 2) << 2; + else + off += (ip6e->ip6e_len + 1) << 3; + nxt = ip6e->ip6e_nxt; + } + loopend: + } + if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { + /* to be done */ + } + if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) { + /* to be done */ + } + /* IN6P_RTHDR - to be done */ +} + +/* + * Get pointer to the previous header followed by the header + * currently processed. + * XXX: This function supposes that + * M includes all headers, + * the next header field and the header length field of each header + * are valid, and + * the sum of each header length equals to OFF. + * Because of these assumptions, this function must be called very + * carefully. Moreover, it will not be used in the near future when + * we develop `neater' mechanism to process extension headers. + */ +char * +ip6_get_prevhdr(m, off) + struct mbuf *m; + int off; +{ + struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); + + if (off == sizeof(struct ip6_hdr)) + return(&ip6->ip6_nxt); + else { + int len, nxt; + struct ip6_ext *ip6e = NULL; + + nxt = ip6->ip6_nxt; + len = sizeof(struct ip6_hdr); + while (len < off) { + ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); + + switch(nxt) { + case IPPROTO_FRAGMENT: + len += sizeof(struct ip6_frag); + break; + case IPPROTO_AH: + len += (ip6e->ip6e_len + 2) << 2; + break; + default: + len += (ip6e->ip6e_len + 1) << 3; + break; + } + nxt = ip6e->ip6e_nxt; + } + if (ip6e) + return(&ip6e->ip6e_nxt); + else + return NULL; + } +} + +/* + * System control for IP6 + */ + +u_char inet6ctlerrmap[PRC_NCMDS] = { + 0, 0, 0, 0, + 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, + EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, + EMSGSIZE, EHOSTUNREACH, 0, 0, + 0, 0, 0, 0, + ENOPROTOOPT +}; |
