1686cdd19SJun-ichiro itojun Hagino /* $FreeBSD$ */ 288ff5695SSUZUKI Shinsuke /* $KAME: frag6.c,v 1.33 2002/01/07 11:34:48 kjc Exp $ */ 3686cdd19SJun-ichiro itojun Hagino 482cd038dSYoshinobu Inoue /* 582cd038dSYoshinobu Inoue * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 682cd038dSYoshinobu Inoue * All rights reserved. 782cd038dSYoshinobu Inoue * 882cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 982cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 1082cd038dSYoshinobu Inoue * are met: 1182cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 1282cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 1382cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 1482cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 1582cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 1682cd038dSYoshinobu Inoue * 3. Neither the name of the project nor the names of its contributors 1782cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 1882cd038dSYoshinobu Inoue * without specific prior written permission. 1982cd038dSYoshinobu Inoue * 2082cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2182cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2282cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2382cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2482cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2582cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2682cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2782cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2882cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2982cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3082cd038dSYoshinobu Inoue * SUCH DAMAGE. 3182cd038dSYoshinobu Inoue */ 3282cd038dSYoshinobu Inoue 33de27a78aSHajimu UMEMOTO #include "opt_random_ip_id.h" 34de27a78aSHajimu UMEMOTO 3582cd038dSYoshinobu Inoue #include <sys/param.h> 3682cd038dSYoshinobu Inoue #include <sys/systm.h> 3782cd038dSYoshinobu Inoue #include <sys/malloc.h> 3882cd038dSYoshinobu Inoue #include <sys/mbuf.h> 3982cd038dSYoshinobu Inoue #include <sys/domain.h> 4082cd038dSYoshinobu Inoue #include <sys/protosw.h> 4182cd038dSYoshinobu Inoue #include <sys/socket.h> 4282cd038dSYoshinobu Inoue #include <sys/errno.h> 4382cd038dSYoshinobu Inoue #include <sys/time.h> 4482cd038dSYoshinobu Inoue #include <sys/kernel.h> 4582cd038dSYoshinobu Inoue #include <sys/syslog.h> 4682cd038dSYoshinobu Inoue 4782cd038dSYoshinobu Inoue #include <net/if.h> 4882cd038dSYoshinobu Inoue #include <net/route.h> 4982cd038dSYoshinobu Inoue 5082cd038dSYoshinobu Inoue #include <netinet/in.h> 5182cd038dSYoshinobu Inoue #include <netinet/in_var.h> 52686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h> 5382cd038dSYoshinobu Inoue #include <netinet6/ip6_var.h> 54686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h> 5582cd038dSYoshinobu Inoue 5682cd038dSYoshinobu Inoue #include <net/net_osdep.h> 5782cd038dSYoshinobu Inoue 5882cd038dSYoshinobu Inoue /* 5982cd038dSYoshinobu Inoue * Define it to get a correct behavior on per-interface statistics. 6082cd038dSYoshinobu Inoue * You will need to perform an extra routing table lookup, per fragment, 6182cd038dSYoshinobu Inoue * to do it. This may, or may not be, a performance hit. 6282cd038dSYoshinobu Inoue */ 6382cd038dSYoshinobu Inoue #define IN6_IFSTAT_STRICT 6482cd038dSYoshinobu Inoue 6582cd038dSYoshinobu Inoue static void frag6_enq __P((struct ip6asfrag *, struct ip6asfrag *)); 6682cd038dSYoshinobu Inoue static void frag6_deq __P((struct ip6asfrag *)); 6782cd038dSYoshinobu Inoue static void frag6_insque __P((struct ip6q *, struct ip6q *)); 6882cd038dSYoshinobu Inoue static void frag6_remque __P((struct ip6q *)); 6982cd038dSYoshinobu Inoue static void frag6_freef __P((struct ip6q *)); 7082cd038dSYoshinobu Inoue 7133841545SHajimu UMEMOTO /* XXX we eventually need splreass6, or some real semaphore */ 7282cd038dSYoshinobu Inoue int frag6_doing_reass; 7382cd038dSYoshinobu Inoue u_int frag6_nfragpackets; 7482cd038dSYoshinobu Inoue struct ip6q ip6q; /* ip6 reassemble queue */ 7582cd038dSYoshinobu Inoue 76686cdd19SJun-ichiro itojun Hagino /* FreeBSD tweak */ 77959b7375SPoul-Henning Kamp static MALLOC_DEFINE(M_FTABLE, "fragment", "fragment reassembly header"); 78686cdd19SJun-ichiro itojun Hagino 7982cd038dSYoshinobu Inoue /* 8082cd038dSYoshinobu Inoue * Initialise reassembly queue and fragment identifier. 8182cd038dSYoshinobu Inoue */ 8282cd038dSYoshinobu Inoue void 8382cd038dSYoshinobu Inoue frag6_init() 8482cd038dSYoshinobu Inoue { 8582cd038dSYoshinobu Inoue 8696c2b042SJesper Skriver ip6_maxfragpackets = nmbclusters / 4; 8796c2b042SJesper Skriver 88de27a78aSHajimu UMEMOTO #ifndef RANDOM_IP_ID 8918193b6fSHajimu UMEMOTO ip6_id = arc4random(); 908513854dSHajimu UMEMOTO #endif 91686cdd19SJun-ichiro itojun Hagino ip6q.ip6q_next = ip6q.ip6q_prev = &ip6q; 9282cd038dSYoshinobu Inoue } 9382cd038dSYoshinobu Inoue 9482cd038dSYoshinobu Inoue /* 95686cdd19SJun-ichiro itojun Hagino * In RFC2460, fragment and reassembly rule do not agree with each other, 96686cdd19SJun-ichiro itojun Hagino * in terms of next header field handling in fragment header. 97686cdd19SJun-ichiro itojun Hagino * While the sender will use the same value for all of the fragmented packets, 98686cdd19SJun-ichiro itojun Hagino * receiver is suggested not to check the consistency. 99686cdd19SJun-ichiro itojun Hagino * 100686cdd19SJun-ichiro itojun Hagino * fragment rule (p20): 101686cdd19SJun-ichiro itojun Hagino * (2) A Fragment header containing: 102686cdd19SJun-ichiro itojun Hagino * The Next Header value that identifies the first header of 103686cdd19SJun-ichiro itojun Hagino * the Fragmentable Part of the original packet. 104686cdd19SJun-ichiro itojun Hagino * -> next header field is same for all fragments 105686cdd19SJun-ichiro itojun Hagino * 106686cdd19SJun-ichiro itojun Hagino * reassembly rule (p21): 107686cdd19SJun-ichiro itojun Hagino * The Next Header field of the last header of the Unfragmentable 108686cdd19SJun-ichiro itojun Hagino * Part is obtained from the Next Header field of the first 109686cdd19SJun-ichiro itojun Hagino * fragment's Fragment header. 110686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 111686cdd19SJun-ichiro itojun Hagino * 112686cdd19SJun-ichiro itojun Hagino * The following note also contradicts with fragment rule - noone is going to 113686cdd19SJun-ichiro itojun Hagino * send different fragment with different next header field. 114686cdd19SJun-ichiro itojun Hagino * 115686cdd19SJun-ichiro itojun Hagino * additional note (p22): 116686cdd19SJun-ichiro itojun Hagino * The Next Header values in the Fragment headers of different 117686cdd19SJun-ichiro itojun Hagino * fragments of the same original packet may differ. Only the value 118686cdd19SJun-ichiro itojun Hagino * from the Offset zero fragment packet is used for reassembly. 119686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 120686cdd19SJun-ichiro itojun Hagino * 121686cdd19SJun-ichiro itojun Hagino * There is no explicit reason given in the RFC. Historical reason maybe? 122686cdd19SJun-ichiro itojun Hagino */ 123686cdd19SJun-ichiro itojun Hagino /* 12482cd038dSYoshinobu Inoue * Fragment input 12582cd038dSYoshinobu Inoue */ 12682cd038dSYoshinobu Inoue int 12782cd038dSYoshinobu Inoue frag6_input(mp, offp, proto) 12882cd038dSYoshinobu Inoue struct mbuf **mp; 12982cd038dSYoshinobu Inoue int *offp, proto; 13082cd038dSYoshinobu Inoue { 13182cd038dSYoshinobu Inoue struct mbuf *m = *mp, *t; 13282cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 13382cd038dSYoshinobu Inoue struct ip6_frag *ip6f; 13482cd038dSYoshinobu Inoue struct ip6q *q6; 135686cdd19SJun-ichiro itojun Hagino struct ip6asfrag *af6, *ip6af, *af6dwn; 13682cd038dSYoshinobu Inoue int offset = *offp, nxt, i, next; 13782cd038dSYoshinobu Inoue int first_frag = 0; 138686cdd19SJun-ichiro itojun Hagino int fragoff, frgpartlen; /* must be larger than u_int16_t */ 13982cd038dSYoshinobu Inoue struct ifnet *dstifp; 14082cd038dSYoshinobu Inoue #ifdef IN6_IFSTAT_STRICT 14182cd038dSYoshinobu Inoue static struct route_in6 ro; 14282cd038dSYoshinobu Inoue struct sockaddr_in6 *dst; 14382cd038dSYoshinobu Inoue #endif 14482cd038dSYoshinobu Inoue 14582cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 146686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 147686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), IPPROTO_DONE); 14882cd038dSYoshinobu Inoue ip6f = (struct ip6_frag *)((caddr_t)ip6 + offset); 149686cdd19SJun-ichiro itojun Hagino #else 150686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(ip6f, struct ip6_frag *, m, offset, sizeof(*ip6f)); 151686cdd19SJun-ichiro itojun Hagino if (ip6f == NULL) 15240e39bbbSHajimu UMEMOTO return (IPPROTO_DONE); 153686cdd19SJun-ichiro itojun Hagino #endif 15482cd038dSYoshinobu Inoue 15582cd038dSYoshinobu Inoue dstifp = NULL; 15682cd038dSYoshinobu Inoue #ifdef IN6_IFSTAT_STRICT 15782cd038dSYoshinobu Inoue /* find the destination interface of the packet. */ 15882cd038dSYoshinobu Inoue dst = (struct sockaddr_in6 *)&ro.ro_dst; 15982cd038dSYoshinobu Inoue if (ro.ro_rt 16082cd038dSYoshinobu Inoue && ((ro.ro_rt->rt_flags & RTF_UP) == 0 16182cd038dSYoshinobu Inoue || !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 16282cd038dSYoshinobu Inoue RTFREE(ro.ro_rt); 16382cd038dSYoshinobu Inoue ro.ro_rt = (struct rtentry *)0; 16482cd038dSYoshinobu Inoue } 16582cd038dSYoshinobu Inoue if (ro.ro_rt == NULL) { 16682cd038dSYoshinobu Inoue bzero(dst, sizeof(*dst)); 16782cd038dSYoshinobu Inoue dst->sin6_family = AF_INET6; 16882cd038dSYoshinobu Inoue dst->sin6_len = sizeof(struct sockaddr_in6); 16982cd038dSYoshinobu Inoue dst->sin6_addr = ip6->ip6_dst; 17082cd038dSYoshinobu Inoue } 171ae5bcbffSYoshinobu Inoue rtalloc((struct route *)&ro); 17282cd038dSYoshinobu Inoue if (ro.ro_rt != NULL && ro.ro_rt->rt_ifa != NULL) 17382cd038dSYoshinobu Inoue dstifp = ((struct in6_ifaddr *)ro.ro_rt->rt_ifa)->ia_ifp; 17482cd038dSYoshinobu Inoue #else 17582cd038dSYoshinobu Inoue /* we are violating the spec, this is not the destination interface */ 17682cd038dSYoshinobu Inoue if ((m->m_flags & M_PKTHDR) != 0) 17782cd038dSYoshinobu Inoue dstifp = m->m_pkthdr.rcvif; 17882cd038dSYoshinobu Inoue #endif 17982cd038dSYoshinobu Inoue 18082cd038dSYoshinobu Inoue /* jumbo payload can't contain a fragment header */ 18182cd038dSYoshinobu Inoue if (ip6->ip6_plen == 0) { 18282cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, offset); 18382cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 18482cd038dSYoshinobu Inoue return IPPROTO_DONE; 18582cd038dSYoshinobu Inoue } 18682cd038dSYoshinobu Inoue 18782cd038dSYoshinobu Inoue /* 18882cd038dSYoshinobu Inoue * check whether fragment packet's fragment length is 18982cd038dSYoshinobu Inoue * multiple of 8 octets. 19082cd038dSYoshinobu Inoue * sizeof(struct ip6_frag) == 8 19182cd038dSYoshinobu Inoue * sizeof(struct ip6_hdr) = 40 19282cd038dSYoshinobu Inoue */ 19382cd038dSYoshinobu Inoue if ((ip6f->ip6f_offlg & IP6F_MORE_FRAG) && 19482cd038dSYoshinobu Inoue (((ntohs(ip6->ip6_plen) - offset) & 0x7) != 0)) { 19582cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, 19682cd038dSYoshinobu Inoue ICMP6_PARAMPROB_HEADER, 197686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_hdr, ip6_plen)); 19882cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 19982cd038dSYoshinobu Inoue return IPPROTO_DONE; 20082cd038dSYoshinobu Inoue } 20182cd038dSYoshinobu Inoue 20282cd038dSYoshinobu Inoue ip6stat.ip6s_fragments++; 20382cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_reqd); 20482cd038dSYoshinobu Inoue 205686cdd19SJun-ichiro itojun Hagino /* offset now points to data portion */ 20682cd038dSYoshinobu Inoue offset += sizeof(struct ip6_frag); 20782cd038dSYoshinobu Inoue 20833841545SHajimu UMEMOTO frag6_doing_reass = 1; 20933841545SHajimu UMEMOTO 21082cd038dSYoshinobu Inoue for (q6 = ip6q.ip6q_next; q6 != &ip6q; q6 = q6->ip6q_next) 21182cd038dSYoshinobu Inoue if (ip6f->ip6f_ident == q6->ip6q_ident && 21282cd038dSYoshinobu Inoue IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &q6->ip6q_src) && 21382cd038dSYoshinobu Inoue IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &q6->ip6q_dst)) 21482cd038dSYoshinobu Inoue break; 21582cd038dSYoshinobu Inoue 21682cd038dSYoshinobu Inoue if (q6 == &ip6q) { 21782cd038dSYoshinobu Inoue /* 21882cd038dSYoshinobu Inoue * the first fragment to arrive, create a reassembly queue. 21982cd038dSYoshinobu Inoue */ 22082cd038dSYoshinobu Inoue first_frag = 1; 22182cd038dSYoshinobu Inoue 22282cd038dSYoshinobu Inoue /* 22382cd038dSYoshinobu Inoue * Enforce upper bound on number of fragmented packets 22482cd038dSYoshinobu Inoue * for which we attempt reassembly; 22582cd038dSYoshinobu Inoue * If maxfrag is 0, never accept fragments. 22682cd038dSYoshinobu Inoue * If maxfrag is -1, accept all fragments without limitation. 22782cd038dSYoshinobu Inoue */ 22833841545SHajimu UMEMOTO if (ip6_maxfragpackets < 0) 22933841545SHajimu UMEMOTO ; 23033841545SHajimu UMEMOTO else if (frag6_nfragpackets >= (u_int)ip6_maxfragpackets) 23133841545SHajimu UMEMOTO goto dropfrag; 23233841545SHajimu UMEMOTO frag6_nfragpackets++; 23382cd038dSYoshinobu Inoue q6 = (struct ip6q *)malloc(sizeof(struct ip6q), M_FTABLE, 234a163d034SWarner Losh M_DONTWAIT); 23582cd038dSYoshinobu Inoue if (q6 == NULL) 23682cd038dSYoshinobu Inoue goto dropfrag; 237686cdd19SJun-ichiro itojun Hagino bzero(q6, sizeof(*q6)); 23882cd038dSYoshinobu Inoue 23982cd038dSYoshinobu Inoue frag6_insque(q6, &ip6q); 24082cd038dSYoshinobu Inoue 241686cdd19SJun-ichiro itojun Hagino /* ip6q_nxt will be filled afterwards, from 1st fragment */ 24282cd038dSYoshinobu Inoue q6->ip6q_down = q6->ip6q_up = (struct ip6asfrag *)q6; 243686cdd19SJun-ichiro itojun Hagino #ifdef notyet 244686cdd19SJun-ichiro itojun Hagino q6->ip6q_nxtp = (u_char *)nxtp; 245686cdd19SJun-ichiro itojun Hagino #endif 24682cd038dSYoshinobu Inoue q6->ip6q_ident = ip6f->ip6f_ident; 24782cd038dSYoshinobu Inoue q6->ip6q_arrive = 0; /* Is it used anywhere? */ 24882cd038dSYoshinobu Inoue q6->ip6q_ttl = IPV6_FRAGTTL; 24982cd038dSYoshinobu Inoue q6->ip6q_src = ip6->ip6_src; 25082cd038dSYoshinobu Inoue q6->ip6q_dst = ip6->ip6_dst; 25182cd038dSYoshinobu Inoue q6->ip6q_unfrglen = -1; /* The 1st fragment has not arrived. */ 25282cd038dSYoshinobu Inoue } 25382cd038dSYoshinobu Inoue 25482cd038dSYoshinobu Inoue /* 25582cd038dSYoshinobu Inoue * If it's the 1st fragment, record the length of the 25682cd038dSYoshinobu Inoue * unfragmentable part and the next header of the fragment header. 25782cd038dSYoshinobu Inoue */ 25882cd038dSYoshinobu Inoue fragoff = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK); 25982cd038dSYoshinobu Inoue if (fragoff == 0) { 26082cd038dSYoshinobu Inoue q6->ip6q_unfrglen = offset - sizeof(struct ip6_hdr) 26182cd038dSYoshinobu Inoue - sizeof(struct ip6_frag); 26282cd038dSYoshinobu Inoue q6->ip6q_nxt = ip6f->ip6f_nxt; 26382cd038dSYoshinobu Inoue } 26482cd038dSYoshinobu Inoue 26582cd038dSYoshinobu Inoue /* 26682cd038dSYoshinobu Inoue * Check that the reassembled packet would not exceed 65535 bytes 26782cd038dSYoshinobu Inoue * in size. 26882cd038dSYoshinobu Inoue * If it would exceed, discard the fragment and return an ICMP error. 26982cd038dSYoshinobu Inoue */ 27082cd038dSYoshinobu Inoue frgpartlen = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - offset; 27182cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen >= 0) { 27282cd038dSYoshinobu Inoue /* The 1st fragment has already arrived. */ 27382cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + fragoff + frgpartlen > IPV6_MAXPACKET) { 27482cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 275686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 276686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 27733841545SHajimu UMEMOTO frag6_doing_reass = 0; 27882cd038dSYoshinobu Inoue return (IPPROTO_DONE); 27982cd038dSYoshinobu Inoue } 28082cd038dSYoshinobu Inoue } 28182cd038dSYoshinobu Inoue else if (fragoff + frgpartlen > IPV6_MAXPACKET) { 28282cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 283686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 284686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 28533841545SHajimu UMEMOTO frag6_doing_reass = 0; 28682cd038dSYoshinobu Inoue return (IPPROTO_DONE); 28782cd038dSYoshinobu Inoue } 28882cd038dSYoshinobu Inoue /* 28982cd038dSYoshinobu Inoue * If it's the first fragment, do the above check for each 29082cd038dSYoshinobu Inoue * fragment already stored in the reassembly queue. 29182cd038dSYoshinobu Inoue */ 29282cd038dSYoshinobu Inoue if (fragoff == 0) { 29382cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 29482cd038dSYoshinobu Inoue af6 = af6dwn) { 29582cd038dSYoshinobu Inoue af6dwn = af6->ip6af_down; 29682cd038dSYoshinobu Inoue 29782cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + af6->ip6af_off + af6->ip6af_frglen > 29882cd038dSYoshinobu Inoue IPV6_MAXPACKET) { 29982cd038dSYoshinobu Inoue struct mbuf *merr = IP6_REASS_MBUF(af6); 30082cd038dSYoshinobu Inoue struct ip6_hdr *ip6err; 30182cd038dSYoshinobu Inoue int erroff = af6->ip6af_offset; 30282cd038dSYoshinobu Inoue 30382cd038dSYoshinobu Inoue /* dequeue the fragment. */ 30482cd038dSYoshinobu Inoue frag6_deq(af6); 305686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 30682cd038dSYoshinobu Inoue 30782cd038dSYoshinobu Inoue /* adjust pointer. */ 30882cd038dSYoshinobu Inoue ip6err = mtod(merr, struct ip6_hdr *); 30982cd038dSYoshinobu Inoue 31082cd038dSYoshinobu Inoue /* 31182cd038dSYoshinobu Inoue * Restore source and destination addresses 31282cd038dSYoshinobu Inoue * in the erroneous IPv6 header. 31382cd038dSYoshinobu Inoue */ 31482cd038dSYoshinobu Inoue ip6err->ip6_src = q6->ip6q_src; 31582cd038dSYoshinobu Inoue ip6err->ip6_dst = q6->ip6q_dst; 31682cd038dSYoshinobu Inoue 31782cd038dSYoshinobu Inoue icmp6_error(merr, ICMP6_PARAM_PROB, 31882cd038dSYoshinobu Inoue ICMP6_PARAMPROB_HEADER, 319686cdd19SJun-ichiro itojun Hagino erroff - sizeof(struct ip6_frag) + 320686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 32182cd038dSYoshinobu Inoue } 32282cd038dSYoshinobu Inoue } 32382cd038dSYoshinobu Inoue } 32482cd038dSYoshinobu Inoue 325686cdd19SJun-ichiro itojun Hagino ip6af = (struct ip6asfrag *)malloc(sizeof(struct ip6asfrag), M_FTABLE, 326a163d034SWarner Losh M_DONTWAIT); 327686cdd19SJun-ichiro itojun Hagino if (ip6af == NULL) 328686cdd19SJun-ichiro itojun Hagino goto dropfrag; 329686cdd19SJun-ichiro itojun Hagino bzero(ip6af, sizeof(*ip6af)); 330686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_head = ip6->ip6_flow; 331686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_len = ip6->ip6_plen; 332686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_nxt = ip6->ip6_nxt; 333686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_hlim = ip6->ip6_hlim; 33482cd038dSYoshinobu Inoue ip6af->ip6af_mff = ip6f->ip6f_offlg & IP6F_MORE_FRAG; 33582cd038dSYoshinobu Inoue ip6af->ip6af_off = fragoff; 33682cd038dSYoshinobu Inoue ip6af->ip6af_frglen = frgpartlen; 33782cd038dSYoshinobu Inoue ip6af->ip6af_offset = offset; 33882cd038dSYoshinobu Inoue IP6_REASS_MBUF(ip6af) = m; 33982cd038dSYoshinobu Inoue 34082cd038dSYoshinobu Inoue if (first_frag) { 34182cd038dSYoshinobu Inoue af6 = (struct ip6asfrag *)q6; 34282cd038dSYoshinobu Inoue goto insert; 34382cd038dSYoshinobu Inoue } 34482cd038dSYoshinobu Inoue 34582cd038dSYoshinobu Inoue /* 34682cd038dSYoshinobu Inoue * Find a segment which begins after this one does. 34782cd038dSYoshinobu Inoue */ 34882cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 34982cd038dSYoshinobu Inoue af6 = af6->ip6af_down) 35082cd038dSYoshinobu Inoue if (af6->ip6af_off > ip6af->ip6af_off) 35182cd038dSYoshinobu Inoue break; 35282cd038dSYoshinobu Inoue 353686cdd19SJun-ichiro itojun Hagino #if 0 354686cdd19SJun-ichiro itojun Hagino /* 355686cdd19SJun-ichiro itojun Hagino * If there is a preceding segment, it may provide some of 356686cdd19SJun-ichiro itojun Hagino * our data already. If so, drop the data from the incoming 357686cdd19SJun-ichiro itojun Hagino * segment. If it provides all of our data, drop us. 358686cdd19SJun-ichiro itojun Hagino */ 359686cdd19SJun-ichiro itojun Hagino if (af6->ip6af_up != (struct ip6asfrag *)q6) { 360686cdd19SJun-ichiro itojun Hagino i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 361686cdd19SJun-ichiro itojun Hagino - ip6af->ip6af_off; 362686cdd19SJun-ichiro itojun Hagino if (i > 0) { 363686cdd19SJun-ichiro itojun Hagino if (i >= ip6af->ip6af_frglen) 364686cdd19SJun-ichiro itojun Hagino goto dropfrag; 365686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(ip6af), i); 366686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off += i; 367686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_frglen -= i; 368686cdd19SJun-ichiro itojun Hagino } 369686cdd19SJun-ichiro itojun Hagino } 370686cdd19SJun-ichiro itojun Hagino 371686cdd19SJun-ichiro itojun Hagino /* 372686cdd19SJun-ichiro itojun Hagino * While we overlap succeeding segments trim them or, 373686cdd19SJun-ichiro itojun Hagino * if they are completely covered, dequeue them. 374686cdd19SJun-ichiro itojun Hagino */ 375686cdd19SJun-ichiro itojun Hagino while (af6 != (struct ip6asfrag *)q6 && 376686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off + ip6af->ip6af_frglen > af6->ip6af_off) { 377686cdd19SJun-ichiro itojun Hagino i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 378686cdd19SJun-ichiro itojun Hagino if (i < af6->ip6af_frglen) { 379686cdd19SJun-ichiro itojun Hagino af6->ip6af_frglen -= i; 380686cdd19SJun-ichiro itojun Hagino af6->ip6af_off += i; 381686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(af6), i); 382686cdd19SJun-ichiro itojun Hagino break; 383686cdd19SJun-ichiro itojun Hagino } 384686cdd19SJun-ichiro itojun Hagino af6 = af6->ip6af_down; 385686cdd19SJun-ichiro itojun Hagino m_freem(IP6_REASS_MBUF(af6->ip6af_up)); 386686cdd19SJun-ichiro itojun Hagino frag6_deq(af6->ip6af_up); 387686cdd19SJun-ichiro itojun Hagino } 388686cdd19SJun-ichiro itojun Hagino #else 38982cd038dSYoshinobu Inoue /* 39082cd038dSYoshinobu Inoue * If the incoming framgent overlaps some existing fragments in 39182cd038dSYoshinobu Inoue * the reassembly queue, drop it, since it is dangerous to override 39282cd038dSYoshinobu Inoue * existing fragments from a security point of view. 39382cd038dSYoshinobu Inoue */ 39482cd038dSYoshinobu Inoue if (af6->ip6af_up != (struct ip6asfrag *)q6) { 39582cd038dSYoshinobu Inoue i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 39682cd038dSYoshinobu Inoue - ip6af->ip6af_off; 39782cd038dSYoshinobu Inoue if (i > 0) { 3982bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 39982cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 40082cd038dSYoshinobu Inoue "overlaps the previous fragment\n", 40182cd038dSYoshinobu Inoue i, ip6_sprintf(&q6->ip6q_src)); 4022bf76779SMunechika SUMIKAWA #endif 4032bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 40482cd038dSYoshinobu Inoue goto dropfrag; 40582cd038dSYoshinobu Inoue } 40682cd038dSYoshinobu Inoue } 40782cd038dSYoshinobu Inoue if (af6 != (struct ip6asfrag *)q6) { 40882cd038dSYoshinobu Inoue i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 40982cd038dSYoshinobu Inoue if (i > 0) { 4102bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 41182cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 41282cd038dSYoshinobu Inoue "overlaps the succeeding fragment", 41382cd038dSYoshinobu Inoue i, ip6_sprintf(&q6->ip6q_src)); 4142bf76779SMunechika SUMIKAWA #endif 4152bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 41682cd038dSYoshinobu Inoue goto dropfrag; 41782cd038dSYoshinobu Inoue } 41882cd038dSYoshinobu Inoue } 419686cdd19SJun-ichiro itojun Hagino #endif 42082cd038dSYoshinobu Inoue 42182cd038dSYoshinobu Inoue insert: 42282cd038dSYoshinobu Inoue 42382cd038dSYoshinobu Inoue /* 42482cd038dSYoshinobu Inoue * Stick new segment in its place; 42582cd038dSYoshinobu Inoue * check for complete reassembly. 42682cd038dSYoshinobu Inoue * Move to front of packet queue, as we are 42782cd038dSYoshinobu Inoue * the most recently active fragmented packet. 42882cd038dSYoshinobu Inoue */ 42982cd038dSYoshinobu Inoue frag6_enq(ip6af, af6->ip6af_up); 430686cdd19SJun-ichiro itojun Hagino #if 0 /* xxx */ 431686cdd19SJun-ichiro itojun Hagino if (q6 != ip6q.ip6q_next) { 432686cdd19SJun-ichiro itojun Hagino frag6_remque(q6); 433686cdd19SJun-ichiro itojun Hagino frag6_insque(q6, &ip6q); 434686cdd19SJun-ichiro itojun Hagino } 435686cdd19SJun-ichiro itojun Hagino #endif 43682cd038dSYoshinobu Inoue next = 0; 43782cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 43882cd038dSYoshinobu Inoue af6 = af6->ip6af_down) { 43982cd038dSYoshinobu Inoue if (af6->ip6af_off != next) { 44082cd038dSYoshinobu Inoue frag6_doing_reass = 0; 44182cd038dSYoshinobu Inoue return IPPROTO_DONE; 44282cd038dSYoshinobu Inoue } 44382cd038dSYoshinobu Inoue next += af6->ip6af_frglen; 44482cd038dSYoshinobu Inoue } 44582cd038dSYoshinobu Inoue if (af6->ip6af_up->ip6af_mff) { 44682cd038dSYoshinobu Inoue frag6_doing_reass = 0; 44782cd038dSYoshinobu Inoue return IPPROTO_DONE; 44882cd038dSYoshinobu Inoue } 44982cd038dSYoshinobu Inoue 45082cd038dSYoshinobu Inoue /* 45182cd038dSYoshinobu Inoue * Reassembly is complete; concatenate fragments. 45282cd038dSYoshinobu Inoue */ 45382cd038dSYoshinobu Inoue ip6af = q6->ip6q_down; 45482cd038dSYoshinobu Inoue t = m = IP6_REASS_MBUF(ip6af); 45582cd038dSYoshinobu Inoue af6 = ip6af->ip6af_down; 456686cdd19SJun-ichiro itojun Hagino frag6_deq(ip6af); 45782cd038dSYoshinobu Inoue while (af6 != (struct ip6asfrag *)q6) { 458686cdd19SJun-ichiro itojun Hagino af6dwn = af6->ip6af_down; 459686cdd19SJun-ichiro itojun Hagino frag6_deq(af6); 46082cd038dSYoshinobu Inoue while (t->m_next) 46182cd038dSYoshinobu Inoue t = t->m_next; 46282cd038dSYoshinobu Inoue t->m_next = IP6_REASS_MBUF(af6); 463686cdd19SJun-ichiro itojun Hagino m_adj(t->m_next, af6->ip6af_offset); 464686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 465686cdd19SJun-ichiro itojun Hagino af6 = af6dwn; 46682cd038dSYoshinobu Inoue } 46782cd038dSYoshinobu Inoue 46882cd038dSYoshinobu Inoue /* adjust offset to point where the original next header starts */ 46982cd038dSYoshinobu Inoue offset = ip6af->ip6af_offset - sizeof(struct ip6_frag); 470686cdd19SJun-ichiro itojun Hagino free(ip6af, M_FTABLE); 471686cdd19SJun-ichiro itojun Hagino ip6 = mtod(m, struct ip6_hdr *); 47282cd038dSYoshinobu Inoue ip6->ip6_plen = htons((u_short)next + offset - sizeof(struct ip6_hdr)); 47382cd038dSYoshinobu Inoue ip6->ip6_src = q6->ip6q_src; 47482cd038dSYoshinobu Inoue ip6->ip6_dst = q6->ip6q_dst; 47582cd038dSYoshinobu Inoue nxt = q6->ip6q_nxt; 476686cdd19SJun-ichiro itojun Hagino #ifdef notyet 477686cdd19SJun-ichiro itojun Hagino *q6->ip6q_nxtp = (u_char)(nxt & 0xff); 478686cdd19SJun-ichiro itojun Hagino #endif 47982cd038dSYoshinobu Inoue 48082cd038dSYoshinobu Inoue /* 48182cd038dSYoshinobu Inoue * Delete frag6 header with as a few cost as possible. 48282cd038dSYoshinobu Inoue */ 483686cdd19SJun-ichiro itojun Hagino if (offset < m->m_len) { 48482cd038dSYoshinobu Inoue ovbcopy((caddr_t)ip6, (caddr_t)ip6 + sizeof(struct ip6_frag), 48582cd038dSYoshinobu Inoue offset); 486686cdd19SJun-ichiro itojun Hagino m->m_data += sizeof(struct ip6_frag); 487686cdd19SJun-ichiro itojun Hagino m->m_len -= sizeof(struct ip6_frag); 488686cdd19SJun-ichiro itojun Hagino } else { 489686cdd19SJun-ichiro itojun Hagino /* this comes with no copy if the boundary is on cluster */ 490a163d034SWarner Losh if ((t = m_split(m, offset, M_DONTWAIT)) == NULL) { 491686cdd19SJun-ichiro itojun Hagino frag6_remque(q6); 492686cdd19SJun-ichiro itojun Hagino free(q6, M_FTABLE); 493686cdd19SJun-ichiro itojun Hagino frag6_nfragpackets--; 494686cdd19SJun-ichiro itojun Hagino goto dropfrag; 49582cd038dSYoshinobu Inoue } 496686cdd19SJun-ichiro itojun Hagino m_adj(t, sizeof(struct ip6_frag)); 497686cdd19SJun-ichiro itojun Hagino m_cat(m, t); 498686cdd19SJun-ichiro itojun Hagino } 49982cd038dSYoshinobu Inoue 50082cd038dSYoshinobu Inoue /* 50182cd038dSYoshinobu Inoue * Store NXT to the original. 50282cd038dSYoshinobu Inoue */ 50382cd038dSYoshinobu Inoue { 50482cd038dSYoshinobu Inoue char *prvnxtp = ip6_get_prevhdr(m, offset); /* XXX */ 50582cd038dSYoshinobu Inoue *prvnxtp = nxt; 50682cd038dSYoshinobu Inoue } 50782cd038dSYoshinobu Inoue 50882cd038dSYoshinobu Inoue frag6_remque(q6); 50982cd038dSYoshinobu Inoue free(q6, M_FTABLE); 51082cd038dSYoshinobu Inoue frag6_nfragpackets--; 51182cd038dSYoshinobu Inoue 51282cd038dSYoshinobu Inoue if (m->m_flags & M_PKTHDR) { /* Isn't it always true? */ 51382cd038dSYoshinobu Inoue int plen = 0; 51482cd038dSYoshinobu Inoue for (t = m; t; t = t->m_next) 51582cd038dSYoshinobu Inoue plen += t->m_len; 51682cd038dSYoshinobu Inoue m->m_pkthdr.len = plen; 51782cd038dSYoshinobu Inoue } 51882cd038dSYoshinobu Inoue 51982cd038dSYoshinobu Inoue ip6stat.ip6s_reassembled++; 52082cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_ok); 52182cd038dSYoshinobu Inoue 52282cd038dSYoshinobu Inoue /* 52382cd038dSYoshinobu Inoue * Tell launch routine the next header 52482cd038dSYoshinobu Inoue */ 52582cd038dSYoshinobu Inoue 52682cd038dSYoshinobu Inoue *mp = m; 52782cd038dSYoshinobu Inoue *offp = offset; 52882cd038dSYoshinobu Inoue 52982cd038dSYoshinobu Inoue frag6_doing_reass = 0; 53082cd038dSYoshinobu Inoue return nxt; 53182cd038dSYoshinobu Inoue 53282cd038dSYoshinobu Inoue dropfrag: 53382cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 53482cd038dSYoshinobu Inoue ip6stat.ip6s_fragdropped++; 53582cd038dSYoshinobu Inoue m_freem(m); 53633841545SHajimu UMEMOTO frag6_doing_reass = 0; 53782cd038dSYoshinobu Inoue return IPPROTO_DONE; 53882cd038dSYoshinobu Inoue } 53982cd038dSYoshinobu Inoue 54082cd038dSYoshinobu Inoue /* 54182cd038dSYoshinobu Inoue * Free a fragment reassembly header and all 54282cd038dSYoshinobu Inoue * associated datagrams. 54382cd038dSYoshinobu Inoue */ 54482cd038dSYoshinobu Inoue void 54582cd038dSYoshinobu Inoue frag6_freef(q6) 54682cd038dSYoshinobu Inoue struct ip6q *q6; 54782cd038dSYoshinobu Inoue { 54882cd038dSYoshinobu Inoue struct ip6asfrag *af6, *down6; 54982cd038dSYoshinobu Inoue 55082cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 55182cd038dSYoshinobu Inoue af6 = down6) { 55282cd038dSYoshinobu Inoue struct mbuf *m = IP6_REASS_MBUF(af6); 55382cd038dSYoshinobu Inoue 55482cd038dSYoshinobu Inoue down6 = af6->ip6af_down; 55582cd038dSYoshinobu Inoue frag6_deq(af6); 55682cd038dSYoshinobu Inoue 55782cd038dSYoshinobu Inoue /* 55882cd038dSYoshinobu Inoue * Return ICMP time exceeded error for the 1st fragment. 55982cd038dSYoshinobu Inoue * Just free other fragments. 56082cd038dSYoshinobu Inoue */ 56182cd038dSYoshinobu Inoue if (af6->ip6af_off == 0) { 56282cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 56382cd038dSYoshinobu Inoue 56482cd038dSYoshinobu Inoue /* adjust pointer */ 56582cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 56682cd038dSYoshinobu Inoue 56782cd038dSYoshinobu Inoue /* restoure source and destination addresses */ 56882cd038dSYoshinobu Inoue ip6->ip6_src = q6->ip6q_src; 56982cd038dSYoshinobu Inoue ip6->ip6_dst = q6->ip6q_dst; 57082cd038dSYoshinobu Inoue 57182cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_TIME_EXCEEDED, 57282cd038dSYoshinobu Inoue ICMP6_TIME_EXCEED_REASSEMBLY, 0); 573686cdd19SJun-ichiro itojun Hagino } else 57482cd038dSYoshinobu Inoue m_freem(m); 575686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 57682cd038dSYoshinobu Inoue } 57782cd038dSYoshinobu Inoue frag6_remque(q6); 57882cd038dSYoshinobu Inoue free(q6, M_FTABLE); 57982cd038dSYoshinobu Inoue frag6_nfragpackets--; 58082cd038dSYoshinobu Inoue } 58182cd038dSYoshinobu Inoue 58282cd038dSYoshinobu Inoue /* 58382cd038dSYoshinobu Inoue * Put an ip fragment on a reassembly chain. 58482cd038dSYoshinobu Inoue * Like insque, but pointers in middle of structure. 58582cd038dSYoshinobu Inoue */ 58682cd038dSYoshinobu Inoue void 58782cd038dSYoshinobu Inoue frag6_enq(af6, up6) 58882cd038dSYoshinobu Inoue struct ip6asfrag *af6, *up6; 58982cd038dSYoshinobu Inoue { 59082cd038dSYoshinobu Inoue af6->ip6af_up = up6; 59182cd038dSYoshinobu Inoue af6->ip6af_down = up6->ip6af_down; 59282cd038dSYoshinobu Inoue up6->ip6af_down->ip6af_up = af6; 59382cd038dSYoshinobu Inoue up6->ip6af_down = af6; 59482cd038dSYoshinobu Inoue } 59582cd038dSYoshinobu Inoue 59682cd038dSYoshinobu Inoue /* 59782cd038dSYoshinobu Inoue * To frag6_enq as remque is to insque. 59882cd038dSYoshinobu Inoue */ 59982cd038dSYoshinobu Inoue void 60082cd038dSYoshinobu Inoue frag6_deq(af6) 60182cd038dSYoshinobu Inoue struct ip6asfrag *af6; 60282cd038dSYoshinobu Inoue { 60382cd038dSYoshinobu Inoue af6->ip6af_up->ip6af_down = af6->ip6af_down; 60482cd038dSYoshinobu Inoue af6->ip6af_down->ip6af_up = af6->ip6af_up; 60582cd038dSYoshinobu Inoue } 60682cd038dSYoshinobu Inoue 60782cd038dSYoshinobu Inoue void 60882cd038dSYoshinobu Inoue frag6_insque(new, old) 60982cd038dSYoshinobu Inoue struct ip6q *new, *old; 61082cd038dSYoshinobu Inoue { 61182cd038dSYoshinobu Inoue new->ip6q_prev = old; 61282cd038dSYoshinobu Inoue new->ip6q_next = old->ip6q_next; 61382cd038dSYoshinobu Inoue old->ip6q_next->ip6q_prev= new; 61482cd038dSYoshinobu Inoue old->ip6q_next = new; 61582cd038dSYoshinobu Inoue } 61682cd038dSYoshinobu Inoue 61782cd038dSYoshinobu Inoue void 61882cd038dSYoshinobu Inoue frag6_remque(p6) 61982cd038dSYoshinobu Inoue struct ip6q *p6; 62082cd038dSYoshinobu Inoue { 62182cd038dSYoshinobu Inoue p6->ip6q_prev->ip6q_next = p6->ip6q_next; 62282cd038dSYoshinobu Inoue p6->ip6q_next->ip6q_prev = p6->ip6q_prev; 62382cd038dSYoshinobu Inoue } 62482cd038dSYoshinobu Inoue 62582cd038dSYoshinobu Inoue /* 62633841545SHajimu UMEMOTO * IPv6 reassembling timer processing; 62782cd038dSYoshinobu Inoue * if a timer expires on a reassembly 62882cd038dSYoshinobu Inoue * queue, discard it. 62982cd038dSYoshinobu Inoue */ 63082cd038dSYoshinobu Inoue void 63182cd038dSYoshinobu Inoue frag6_slowtimo() 63282cd038dSYoshinobu Inoue { 63382cd038dSYoshinobu Inoue struct ip6q *q6; 63482cd038dSYoshinobu Inoue int s = splnet(); 63582cd038dSYoshinobu Inoue 63682cd038dSYoshinobu Inoue frag6_doing_reass = 1; 63782cd038dSYoshinobu Inoue q6 = ip6q.ip6q_next; 63882cd038dSYoshinobu Inoue if (q6) 63982cd038dSYoshinobu Inoue while (q6 != &ip6q) { 64082cd038dSYoshinobu Inoue --q6->ip6q_ttl; 64182cd038dSYoshinobu Inoue q6 = q6->ip6q_next; 64282cd038dSYoshinobu Inoue if (q6->ip6q_prev->ip6q_ttl == 0) { 64382cd038dSYoshinobu Inoue ip6stat.ip6s_fragtimeout++; 64482cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 64582cd038dSYoshinobu Inoue frag6_freef(q6->ip6q_prev); 64682cd038dSYoshinobu Inoue } 64782cd038dSYoshinobu Inoue } 64882cd038dSYoshinobu Inoue /* 64982cd038dSYoshinobu Inoue * If we are over the maximum number of fragments 65082cd038dSYoshinobu Inoue * (due to the limit being lowered), drain off 65182cd038dSYoshinobu Inoue * enough to get down to the new limit. 65282cd038dSYoshinobu Inoue */ 65333841545SHajimu UMEMOTO while (frag6_nfragpackets > (u_int)ip6_maxfragpackets && 65433841545SHajimu UMEMOTO ip6q.ip6q_prev) { 65582cd038dSYoshinobu Inoue ip6stat.ip6s_fragoverflow++; 65682cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 65782cd038dSYoshinobu Inoue frag6_freef(ip6q.ip6q_prev); 65882cd038dSYoshinobu Inoue } 65982cd038dSYoshinobu Inoue frag6_doing_reass = 0; 660686cdd19SJun-ichiro itojun Hagino 661686cdd19SJun-ichiro itojun Hagino #if 0 662686cdd19SJun-ichiro itojun Hagino /* 663686cdd19SJun-ichiro itojun Hagino * Routing changes might produce a better route than we last used; 664686cdd19SJun-ichiro itojun Hagino * make sure we notice eventually, even if forwarding only for one 665686cdd19SJun-ichiro itojun Hagino * destination and the cache is never replaced. 666686cdd19SJun-ichiro itojun Hagino */ 667686cdd19SJun-ichiro itojun Hagino if (ip6_forward_rt.ro_rt) { 668686cdd19SJun-ichiro itojun Hagino RTFREE(ip6_forward_rt.ro_rt); 669686cdd19SJun-ichiro itojun Hagino ip6_forward_rt.ro_rt = 0; 670686cdd19SJun-ichiro itojun Hagino } 671686cdd19SJun-ichiro itojun Hagino if (ipsrcchk_rt.ro_rt) { 672686cdd19SJun-ichiro itojun Hagino RTFREE(ipsrcchk_rt.ro_rt); 673686cdd19SJun-ichiro itojun Hagino ipsrcchk_rt.ro_rt = 0; 674686cdd19SJun-ichiro itojun Hagino } 675686cdd19SJun-ichiro itojun Hagino #endif 676686cdd19SJun-ichiro itojun Hagino 67782cd038dSYoshinobu Inoue splx(s); 67882cd038dSYoshinobu Inoue } 67982cd038dSYoshinobu Inoue 68082cd038dSYoshinobu Inoue /* 68182cd038dSYoshinobu Inoue * Drain off all datagram fragments. 68282cd038dSYoshinobu Inoue */ 68382cd038dSYoshinobu Inoue void 68482cd038dSYoshinobu Inoue frag6_drain() 68582cd038dSYoshinobu Inoue { 68682cd038dSYoshinobu Inoue if (frag6_doing_reass) 68782cd038dSYoshinobu Inoue return; 68882cd038dSYoshinobu Inoue while (ip6q.ip6q_next != &ip6q) { 68982cd038dSYoshinobu Inoue ip6stat.ip6s_fragdropped++; 69082cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 69182cd038dSYoshinobu Inoue frag6_freef(ip6q.ip6q_next); 69282cd038dSYoshinobu Inoue } 69382cd038dSYoshinobu Inoue } 694