1caf43b02SWarner Losh /*- 251369649SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause 351369649SPedro F. Giffuni * 482cd038dSYoshinobu Inoue * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 582cd038dSYoshinobu Inoue * All rights reserved. 682cd038dSYoshinobu Inoue * 782cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 882cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 982cd038dSYoshinobu Inoue * are met: 1082cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 1182cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 1282cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 1382cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 1482cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 1582cd038dSYoshinobu Inoue * 3. Neither the name of the project nor the names of its contributors 1682cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 1782cd038dSYoshinobu Inoue * without specific prior written permission. 1882cd038dSYoshinobu Inoue * 1982cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2082cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2182cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2282cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2382cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2482cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2582cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2682cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2782cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2882cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2982cd038dSYoshinobu Inoue * SUCH DAMAGE. 30b48287a3SDavid E. O'Brien * 31b48287a3SDavid E. O'Brien * $KAME: frag6.c,v 1.33 2002/01/07 11:34:48 kjc Exp $ 3282cd038dSYoshinobu Inoue */ 3382cd038dSYoshinobu Inoue 34b48287a3SDavid E. O'Brien #include <sys/cdefs.h> 35b48287a3SDavid E. O'Brien __FBSDID("$FreeBSD$"); 36b48287a3SDavid E. O'Brien 37aaa46574SAdrian Chadd #include "opt_rss.h" 38aaa46574SAdrian Chadd 3982cd038dSYoshinobu Inoue #include <sys/param.h> 4082cd038dSYoshinobu Inoue #include <sys/systm.h> 4180d7a853SJonathan T. Looney #include <sys/hash.h> 4282cd038dSYoshinobu Inoue #include <sys/malloc.h> 4382cd038dSYoshinobu Inoue #include <sys/mbuf.h> 4482cd038dSYoshinobu Inoue #include <sys/domain.h> 45ea8d1492SAlexander V. Chernikov #include <sys/eventhandler.h> 4682cd038dSYoshinobu Inoue #include <sys/protosw.h> 4782cd038dSYoshinobu Inoue #include <sys/socket.h> 4882cd038dSYoshinobu Inoue #include <sys/errno.h> 4982cd038dSYoshinobu Inoue #include <sys/time.h> 5082cd038dSYoshinobu Inoue #include <sys/kernel.h> 5182cd038dSYoshinobu Inoue #include <sys/syslog.h> 5282cd038dSYoshinobu Inoue 5380d7a853SJonathan T. Looney #include <machine/atomic.h> 5480d7a853SJonathan T. Looney 5582cd038dSYoshinobu Inoue #include <net/if.h> 5676039bc8SGleb Smirnoff #include <net/if_var.h> 57aaa46574SAdrian Chadd #include <net/netisr.h> 5882cd038dSYoshinobu Inoue #include <net/route.h> 59eddfbb76SRobert Watson #include <net/vnet.h> 6082cd038dSYoshinobu Inoue 6182cd038dSYoshinobu Inoue #include <netinet/in.h> 6282cd038dSYoshinobu Inoue #include <netinet/in_var.h> 63686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h> 6482cd038dSYoshinobu Inoue #include <netinet6/ip6_var.h> 65686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h> 6659dfcba4SHajimu UMEMOTO #include <netinet/in_systm.h> /* for ECN definitions */ 6759dfcba4SHajimu UMEMOTO #include <netinet/ip.h> /* for ECN definitions */ 6882cd038dSYoshinobu Inoue 694b908c8bSRobert Watson #include <security/mac/mac_framework.h> 704b908c8bSRobert Watson 7131e8f7e5SHajimu UMEMOTO /* 7280d7a853SJonathan T. Looney * Reassembly headers are stored in hash buckets. 7331e8f7e5SHajimu UMEMOTO */ 742ceeacbeSJonathan T. Looney #define IP6REASS_NHASH_LOG2 10 7580d7a853SJonathan T. Looney #define IP6REASS_NHASH (1 << IP6REASS_NHASH_LOG2) 7680d7a853SJonathan T. Looney #define IP6REASS_HMASK (IP6REASS_NHASH - 1) 7780d7a853SJonathan T. Looney 7880d7a853SJonathan T. Looney static void frag6_enq(struct ip6asfrag *, struct ip6asfrag *, 7980d7a853SJonathan T. Looney uint32_t bucket __unused); 8080d7a853SJonathan T. Looney static void frag6_deq(struct ip6asfrag *, uint32_t bucket __unused); 8180d7a853SJonathan T. Looney static void frag6_insque_head(struct ip6q *, struct ip6q *, 821e9f3b73SJonathan T. Looney uint32_t bucket); 831e9f3b73SJonathan T. Looney static void frag6_remque(struct ip6q *, uint32_t bucket); 8480d7a853SJonathan T. Looney static void frag6_freef(struct ip6q *, uint32_t bucket); 8580d7a853SJonathan T. Looney 8680d7a853SJonathan T. Looney struct ip6qbucket { 8780d7a853SJonathan T. Looney struct ip6q ip6q; 8880d7a853SJonathan T. Looney struct mtx lock; 891e9f3b73SJonathan T. Looney int count; 9080d7a853SJonathan T. Looney }; 9180d7a853SJonathan T. Looney 9280d7a853SJonathan T. Looney VNET_DEFINE_STATIC(volatile u_int, frag6_nfragpackets); 932adfd64fSJonathan T. Looney volatile u_int frag6_nfrags = 0; 9480d7a853SJonathan T. Looney VNET_DEFINE_STATIC(struct ip6qbucket, ip6q[IP6REASS_NHASH]); 9580d7a853SJonathan T. Looney VNET_DEFINE_STATIC(uint32_t, ip6q_hashseed); 96eddfbb76SRobert Watson 971e77c105SRobert Watson #define V_frag6_nfragpackets VNET(frag6_nfragpackets) 981e77c105SRobert Watson #define V_ip6q VNET(ip6q) 9980d7a853SJonathan T. Looney #define V_ip6q_hashseed VNET(ip6q_hashseed) 10082cd038dSYoshinobu Inoue 10180d7a853SJonathan T. Looney #define IP6Q_LOCK(i) mtx_lock(&V_ip6q[(i)].lock) 10280d7a853SJonathan T. Looney #define IP6Q_TRYLOCK(i) mtx_trylock(&V_ip6q[(i)].lock) 10380d7a853SJonathan T. Looney #define IP6Q_LOCK_ASSERT(i) mtx_assert(&V_ip6q[(i)].lock, MA_OWNED) 10480d7a853SJonathan T. Looney #define IP6Q_UNLOCK(i) mtx_unlock(&V_ip6q[(i)].lock) 10580d7a853SJonathan T. Looney #define IP6Q_HEAD(i) (&V_ip6q[(i)].ip6q) 1069888c401SHajimu UMEMOTO 107959b7375SPoul-Henning Kamp static MALLOC_DEFINE(M_FTABLE, "fragment", "fragment reassembly header"); 108686cdd19SJun-ichiro itojun Hagino 10982cd038dSYoshinobu Inoue /* 1102ceeacbeSJonathan T. Looney * By default, limit the number of IP6 fragments across all reassembly 1112ceeacbeSJonathan T. Looney * queues to 1/32 of the total number of mbuf clusters. 1122ceeacbeSJonathan T. Looney * 1132ceeacbeSJonathan T. Looney * Limit the total number of reassembly queues per VNET to the 1142ceeacbeSJonathan T. Looney * IP6 fragment limit, but ensure the limit will not allow any bucket 1152ceeacbeSJonathan T. Looney * to grow above 100 items. (The bucket limit is 1162ceeacbeSJonathan T. Looney * IP_MAXFRAGPACKETS / (IPREASS_NHASH / 2), so the 50 is the correct 1172ceeacbeSJonathan T. Looney * multiplier to reach a 100-item limit.) 1182ceeacbeSJonathan T. Looney * The 100-item limit was chosen as brief testing seems to show that 1192ceeacbeSJonathan T. Looney * this produces "reasonable" performance on some subset of systems 1202ceeacbeSJonathan T. Looney * under DoS attack. 1212ceeacbeSJonathan T. Looney */ 1222ceeacbeSJonathan T. Looney #define IP6_MAXFRAGS (nmbclusters / 32) 1232ceeacbeSJonathan T. Looney #define IP6_MAXFRAGPACKETS (imin(IP6_MAXFRAGS, IP6REASS_NHASH * 50)) 1242ceeacbeSJonathan T. Looney 1252ceeacbeSJonathan T. Looney /* 12682cd038dSYoshinobu Inoue * Initialise reassembly queue and fragment identifier. 12782cd038dSYoshinobu Inoue */ 1281e9f3b73SJonathan T. Looney void 1291e9f3b73SJonathan T. Looney frag6_set_bucketsize() 1301e9f3b73SJonathan T. Looney { 1311e9f3b73SJonathan T. Looney int i; 1321e9f3b73SJonathan T. Looney 1331e9f3b73SJonathan T. Looney if ((i = V_ip6_maxfragpackets) > 0) 1341e9f3b73SJonathan T. Looney V_ip6_maxfragbucketsize = imax(i / (IP6REASS_NHASH / 2), 1); 1351e9f3b73SJonathan T. Looney } 1361e9f3b73SJonathan T. Looney 1374f590175SPaul Saab static void 1384f590175SPaul Saab frag6_change(void *tag) 1394f590175SPaul Saab { 1402adfd64fSJonathan T. Looney VNET_ITERATOR_DECL(vnet_iter); 1414f590175SPaul Saab 1422ceeacbeSJonathan T. Looney ip6_maxfrags = IP6_MAXFRAGS; 1432adfd64fSJonathan T. Looney VNET_LIST_RLOCK_NOSLEEP(); 1442adfd64fSJonathan T. Looney VNET_FOREACH(vnet_iter) { 1452adfd64fSJonathan T. Looney CURVNET_SET(vnet_iter); 1462ceeacbeSJonathan T. Looney V_ip6_maxfragpackets = IP6_MAXFRAGPACKETS; 1471e9f3b73SJonathan T. Looney frag6_set_bucketsize(); 1482adfd64fSJonathan T. Looney CURVNET_RESTORE(); 1492adfd64fSJonathan T. Looney } 1502adfd64fSJonathan T. Looney VNET_LIST_RUNLOCK_NOSLEEP(); 1514f590175SPaul Saab } 1524f590175SPaul Saab 15382cd038dSYoshinobu Inoue void 1541272577eSXin LI frag6_init(void) 15582cd038dSYoshinobu Inoue { 15680d7a853SJonathan T. Looney struct ip6q *q6; 15780d7a853SJonathan T. Looney int i; 15882cd038dSYoshinobu Inoue 1592ceeacbeSJonathan T. Looney V_ip6_maxfragpackets = IP6_MAXFRAGPACKETS; 1601e9f3b73SJonathan T. Looney frag6_set_bucketsize(); 16180d7a853SJonathan T. Looney for (i = 0; i < IP6REASS_NHASH; i++) { 16280d7a853SJonathan T. Looney q6 = IP6Q_HEAD(i); 16380d7a853SJonathan T. Looney q6->ip6q_next = q6->ip6q_prev = q6; 16480d7a853SJonathan T. Looney mtx_init(&V_ip6q[i].lock, "ip6qlock", NULL, MTX_DEF); 1651e9f3b73SJonathan T. Looney V_ip6q[i].count = 0; 16680d7a853SJonathan T. Looney } 16780d7a853SJonathan T. Looney V_ip6q_hashseed = arc4random(); 16803c99d76SJonathan T. Looney V_ip6_maxfragsperpacket = 64; 1691ed81b73SMarko Zec if (!IS_DEFAULT_VNET(curvnet)) 1701ed81b73SMarko Zec return; 17196c2b042SJesper Skriver 1722ceeacbeSJonathan T. Looney ip6_maxfrags = IP6_MAXFRAGS; 1731ed81b73SMarko Zec EVENTHANDLER_REGISTER(nmbclusters_change, 1741ed81b73SMarko Zec frag6_change, NULL, EVENTHANDLER_PRI_ANY); 17582cd038dSYoshinobu Inoue } 17682cd038dSYoshinobu Inoue 17782cd038dSYoshinobu Inoue /* 178686cdd19SJun-ichiro itojun Hagino * In RFC2460, fragment and reassembly rule do not agree with each other, 179686cdd19SJun-ichiro itojun Hagino * in terms of next header field handling in fragment header. 180686cdd19SJun-ichiro itojun Hagino * While the sender will use the same value for all of the fragmented packets, 181686cdd19SJun-ichiro itojun Hagino * receiver is suggested not to check the consistency. 182686cdd19SJun-ichiro itojun Hagino * 183686cdd19SJun-ichiro itojun Hagino * fragment rule (p20): 184686cdd19SJun-ichiro itojun Hagino * (2) A Fragment header containing: 185686cdd19SJun-ichiro itojun Hagino * The Next Header value that identifies the first header of 186686cdd19SJun-ichiro itojun Hagino * the Fragmentable Part of the original packet. 187686cdd19SJun-ichiro itojun Hagino * -> next header field is same for all fragments 188686cdd19SJun-ichiro itojun Hagino * 189686cdd19SJun-ichiro itojun Hagino * reassembly rule (p21): 190686cdd19SJun-ichiro itojun Hagino * The Next Header field of the last header of the Unfragmentable 191686cdd19SJun-ichiro itojun Hagino * Part is obtained from the Next Header field of the first 192686cdd19SJun-ichiro itojun Hagino * fragment's Fragment header. 193686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 194686cdd19SJun-ichiro itojun Hagino * 195686cdd19SJun-ichiro itojun Hagino * The following note also contradicts with fragment rule - no one is going to 196686cdd19SJun-ichiro itojun Hagino * send different fragment with different next header field. 197686cdd19SJun-ichiro itojun Hagino * 198686cdd19SJun-ichiro itojun Hagino * additional note (p22): 199686cdd19SJun-ichiro itojun Hagino * The Next Header values in the Fragment headers of different 200686cdd19SJun-ichiro itojun Hagino * fragments of the same original packet may differ. Only the value 201686cdd19SJun-ichiro itojun Hagino * from the Offset zero fragment packet is used for reassembly. 202686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 203686cdd19SJun-ichiro itojun Hagino * 204686cdd19SJun-ichiro itojun Hagino * There is no explicit reason given in the RFC. Historical reason maybe? 205686cdd19SJun-ichiro itojun Hagino */ 206686cdd19SJun-ichiro itojun Hagino /* 20782cd038dSYoshinobu Inoue * Fragment input 20882cd038dSYoshinobu Inoue */ 20982cd038dSYoshinobu Inoue int 2101272577eSXin LI frag6_input(struct mbuf **mp, int *offp, int proto) 21182cd038dSYoshinobu Inoue { 21282cd038dSYoshinobu Inoue struct mbuf *m = *mp, *t; 21382cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 21482cd038dSYoshinobu Inoue struct ip6_frag *ip6f; 21580d7a853SJonathan T. Looney struct ip6q *head, *q6; 216686cdd19SJun-ichiro itojun Hagino struct ip6asfrag *af6, *ip6af, *af6dwn; 2172a5aafceSHajimu UMEMOTO struct in6_ifaddr *ia; 21882cd038dSYoshinobu Inoue int offset = *offp, nxt, i, next; 21982cd038dSYoshinobu Inoue int first_frag = 0; 220686cdd19SJun-ichiro itojun Hagino int fragoff, frgpartlen; /* must be larger than u_int16_t */ 221505e91f5SKristof Provost uint32_t hashkey[(sizeof(struct in6_addr) * 2 + 222505e91f5SKristof Provost sizeof(ip6f->ip6f_ident)) / sizeof(uint32_t)]; 223505e91f5SKristof Provost uint32_t hash, *hashkeyp; 22482cd038dSYoshinobu Inoue struct ifnet *dstifp; 22559dfcba4SHajimu UMEMOTO u_int8_t ecn, ecn0; 226aaa46574SAdrian Chadd #ifdef RSS 227aaa46574SAdrian Chadd struct m_tag *mtag; 228aaa46574SAdrian Chadd struct ip6_direct_ctx *ip6dc; 229aaa46574SAdrian Chadd #endif 230aaa46574SAdrian Chadd 2311d54aa3bSBjoern A. Zeeb #if 0 2321d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 2331d54aa3bSBjoern A. Zeeb #endif 23482cd038dSYoshinobu Inoue 23582cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 236686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 237686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), IPPROTO_DONE); 23882cd038dSYoshinobu Inoue ip6f = (struct ip6_frag *)((caddr_t)ip6 + offset); 239686cdd19SJun-ichiro itojun Hagino #else 240686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(ip6f, struct ip6_frag *, m, offset, sizeof(*ip6f)); 241686cdd19SJun-ichiro itojun Hagino if (ip6f == NULL) 24240e39bbbSHajimu UMEMOTO return (IPPROTO_DONE); 243686cdd19SJun-ichiro itojun Hagino #endif 24482cd038dSYoshinobu Inoue 24582cd038dSYoshinobu Inoue dstifp = NULL; 24682cd038dSYoshinobu Inoue /* find the destination interface of the packet. */ 2473e88eb90SAndrey V. Elsukov ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 2483e88eb90SAndrey V. Elsukov if (ia != NULL) { 2492a5aafceSHajimu UMEMOTO dstifp = ia->ia_ifp; 2508c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 2518c0fec80SRobert Watson } 25282cd038dSYoshinobu Inoue /* jumbo payload can't contain a fragment header */ 25382cd038dSYoshinobu Inoue if (ip6->ip6_plen == 0) { 25482cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, offset); 25582cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 25682cd038dSYoshinobu Inoue return IPPROTO_DONE; 25782cd038dSYoshinobu Inoue } 25882cd038dSYoshinobu Inoue 25982cd038dSYoshinobu Inoue /* 26082cd038dSYoshinobu Inoue * check whether fragment packet's fragment length is 26182cd038dSYoshinobu Inoue * multiple of 8 octets. 26282cd038dSYoshinobu Inoue * sizeof(struct ip6_frag) == 8 26382cd038dSYoshinobu Inoue * sizeof(struct ip6_hdr) = 40 26482cd038dSYoshinobu Inoue */ 26582cd038dSYoshinobu Inoue if ((ip6f->ip6f_offlg & IP6F_MORE_FRAG) && 26682cd038dSYoshinobu Inoue (((ntohs(ip6->ip6_plen) - offset) & 0x7) != 0)) { 26706cd0a3fSHajimu UMEMOTO icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 268686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_hdr, ip6_plen)); 26982cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 27082cd038dSYoshinobu Inoue return IPPROTO_DONE; 27182cd038dSYoshinobu Inoue } 27282cd038dSYoshinobu Inoue 2739cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragments); 27482cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_reqd); 27582cd038dSYoshinobu Inoue 276686cdd19SJun-ichiro itojun Hagino /* offset now points to data portion */ 27782cd038dSYoshinobu Inoue offset += sizeof(struct ip6_frag); 27882cd038dSYoshinobu Inoue 2794018ea9aSBjoern A. Zeeb /* 2802946a941STom Jones * Handle "atomic" fragments (offset and m bit set to 0) upfront, 2812946a941STom Jones * unrelated to any reassembly (see RFC 6946 and section 4.5 of RFC 2822946a941STom Jones * 8200). Just skip the fragment header. 2834018ea9aSBjoern A. Zeeb */ 2844018ea9aSBjoern A. Zeeb if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) { 2852946a941STom Jones IP6STAT_INC(ip6s_atomicfrags); 2864018ea9aSBjoern A. Zeeb in6_ifstat_inc(dstifp, ifs6_reass_ok); 2874018ea9aSBjoern A. Zeeb *offp = offset; 288a4061289SAndrey V. Elsukov m->m_flags |= M_FRAGMENTED; 2894018ea9aSBjoern A. Zeeb return (ip6f->ip6f_nxt); 2904018ea9aSBjoern A. Zeeb } 2914018ea9aSBjoern A. Zeeb 2925f9f192dSJonathan T. Looney /* Get fragment length and discard 0-byte fragments. */ 2935f9f192dSJonathan T. Looney frgpartlen = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - offset; 2945f9f192dSJonathan T. Looney if (frgpartlen == 0) { 2955f9f192dSJonathan T. Looney icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 2965f9f192dSJonathan T. Looney offsetof(struct ip6_hdr, ip6_plen)); 2975f9f192dSJonathan T. Looney in6_ifstat_inc(dstifp, ifs6_reass_fail); 2985f9f192dSJonathan T. Looney IP6STAT_INC(ip6s_fragdropped); 2995f9f192dSJonathan T. Looney return IPPROTO_DONE; 3005f9f192dSJonathan T. Looney } 3015f9f192dSJonathan T. Looney 30280d7a853SJonathan T. Looney hashkeyp = hashkey; 30380d7a853SJonathan T. Looney memcpy(hashkeyp, &ip6->ip6_src, sizeof(struct in6_addr)); 30480d7a853SJonathan T. Looney hashkeyp += sizeof(struct in6_addr) / sizeof(*hashkeyp); 30580d7a853SJonathan T. Looney memcpy(hashkeyp, &ip6->ip6_dst, sizeof(struct in6_addr)); 30680d7a853SJonathan T. Looney hashkeyp += sizeof(struct in6_addr) / sizeof(*hashkeyp); 30780d7a853SJonathan T. Looney *hashkeyp = ip6f->ip6f_ident; 30880d7a853SJonathan T. Looney hash = jenkins_hash32(hashkey, nitems(hashkey), V_ip6q_hashseed); 30980d7a853SJonathan T. Looney hash &= IP6REASS_HMASK; 31080d7a853SJonathan T. Looney head = IP6Q_HEAD(hash); 31180d7a853SJonathan T. Looney IP6Q_LOCK(hash); 3129888c401SHajimu UMEMOTO 3139888c401SHajimu UMEMOTO /* 3149888c401SHajimu UMEMOTO * Enforce upper bound on number of fragments. 3159888c401SHajimu UMEMOTO * If maxfrag is 0, never accept fragments. 3169888c401SHajimu UMEMOTO * If maxfrag is -1, accept all fragments without limitation. 3179888c401SHajimu UMEMOTO */ 3182adfd64fSJonathan T. Looney if (ip6_maxfrags < 0) 3199888c401SHajimu UMEMOTO ; 3202adfd64fSJonathan T. Looney else if (atomic_load_int(&frag6_nfrags) >= (u_int)ip6_maxfrags) 3219888c401SHajimu UMEMOTO goto dropfrag; 32233841545SHajimu UMEMOTO 32380d7a853SJonathan T. Looney for (q6 = head->ip6q_next; q6 != head; q6 = q6->ip6q_next) 32482cd038dSYoshinobu Inoue if (ip6f->ip6f_ident == q6->ip6q_ident && 32582cd038dSYoshinobu Inoue IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &q6->ip6q_src) && 3264b908c8bSRobert Watson IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &q6->ip6q_dst) 3274b908c8bSRobert Watson #ifdef MAC 3284b908c8bSRobert Watson && mac_ip6q_match(m, q6) 3294b908c8bSRobert Watson #endif 3304b908c8bSRobert Watson ) 33182cd038dSYoshinobu Inoue break; 33282cd038dSYoshinobu Inoue 33380d7a853SJonathan T. Looney if (q6 == head) { 33482cd038dSYoshinobu Inoue /* 33582cd038dSYoshinobu Inoue * the first fragment to arrive, create a reassembly queue. 33682cd038dSYoshinobu Inoue */ 33782cd038dSYoshinobu Inoue first_frag = 1; 33882cd038dSYoshinobu Inoue 33982cd038dSYoshinobu Inoue /* 34082cd038dSYoshinobu Inoue * Enforce upper bound on number of fragmented packets 34182cd038dSYoshinobu Inoue * for which we attempt reassembly; 3429888c401SHajimu UMEMOTO * If maxfragpackets is 0, never accept fragments. 3439888c401SHajimu UMEMOTO * If maxfragpackets is -1, accept all fragments without 3449888c401SHajimu UMEMOTO * limitation. 34582cd038dSYoshinobu Inoue */ 346603724d3SBjoern A. Zeeb if (V_ip6_maxfragpackets < 0) 34733841545SHajimu UMEMOTO ; 3481e9f3b73SJonathan T. Looney else if (V_ip6q[hash].count >= V_ip6_maxfragbucketsize || 3491e9f3b73SJonathan T. Looney atomic_load_int(&V_frag6_nfragpackets) >= 35080d7a853SJonathan T. Looney (u_int)V_ip6_maxfragpackets) 35133841545SHajimu UMEMOTO goto dropfrag; 35280d7a853SJonathan T. Looney atomic_add_int(&V_frag6_nfragpackets, 1); 35382cd038dSYoshinobu Inoue q6 = (struct ip6q *)malloc(sizeof(struct ip6q), M_FTABLE, 3548c0dd0e4SHajimu UMEMOTO M_NOWAIT); 35582cd038dSYoshinobu Inoue if (q6 == NULL) 35682cd038dSYoshinobu Inoue goto dropfrag; 357686cdd19SJun-ichiro itojun Hagino bzero(q6, sizeof(*q6)); 3584b908c8bSRobert Watson #ifdef MAC 3594b908c8bSRobert Watson if (mac_ip6q_init(q6, M_NOWAIT) != 0) { 3604b908c8bSRobert Watson free(q6, M_FTABLE); 3614b908c8bSRobert Watson goto dropfrag; 3624b908c8bSRobert Watson } 3634b908c8bSRobert Watson mac_ip6q_create(m, q6); 3644b908c8bSRobert Watson #endif 36580d7a853SJonathan T. Looney frag6_insque_head(q6, head, hash); 36682cd038dSYoshinobu Inoue 367686cdd19SJun-ichiro itojun Hagino /* ip6q_nxt will be filled afterwards, from 1st fragment */ 36882cd038dSYoshinobu Inoue q6->ip6q_down = q6->ip6q_up = (struct ip6asfrag *)q6; 369686cdd19SJun-ichiro itojun Hagino #ifdef notyet 370686cdd19SJun-ichiro itojun Hagino q6->ip6q_nxtp = (u_char *)nxtp; 371686cdd19SJun-ichiro itojun Hagino #endif 37282cd038dSYoshinobu Inoue q6->ip6q_ident = ip6f->ip6f_ident; 37382cd038dSYoshinobu Inoue q6->ip6q_ttl = IPV6_FRAGTTL; 37482cd038dSYoshinobu Inoue q6->ip6q_src = ip6->ip6_src; 37582cd038dSYoshinobu Inoue q6->ip6q_dst = ip6->ip6_dst; 3765e9510e3SJINMEI Tatuya q6->ip6q_ecn = 3775e9510e3SJINMEI Tatuya (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 37882cd038dSYoshinobu Inoue q6->ip6q_unfrglen = -1; /* The 1st fragment has not arrived. */ 3799888c401SHajimu UMEMOTO 3809888c401SHajimu UMEMOTO q6->ip6q_nfrag = 0; 38182cd038dSYoshinobu Inoue } 38282cd038dSYoshinobu Inoue 38382cd038dSYoshinobu Inoue /* 38482cd038dSYoshinobu Inoue * If it's the 1st fragment, record the length of the 38582cd038dSYoshinobu Inoue * unfragmentable part and the next header of the fragment header. 38682cd038dSYoshinobu Inoue */ 38782cd038dSYoshinobu Inoue fragoff = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK); 38882cd038dSYoshinobu Inoue if (fragoff == 0) { 38906cd0a3fSHajimu UMEMOTO q6->ip6q_unfrglen = offset - sizeof(struct ip6_hdr) - 39006cd0a3fSHajimu UMEMOTO sizeof(struct ip6_frag); 39182cd038dSYoshinobu Inoue q6->ip6q_nxt = ip6f->ip6f_nxt; 39282cd038dSYoshinobu Inoue } 39382cd038dSYoshinobu Inoue 39482cd038dSYoshinobu Inoue /* 39582cd038dSYoshinobu Inoue * Check that the reassembled packet would not exceed 65535 bytes 39682cd038dSYoshinobu Inoue * in size. 39782cd038dSYoshinobu Inoue * If it would exceed, discard the fragment and return an ICMP error. 39882cd038dSYoshinobu Inoue */ 39982cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen >= 0) { 40082cd038dSYoshinobu Inoue /* The 1st fragment has already arrived. */ 40182cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + fragoff + frgpartlen > IPV6_MAXPACKET) { 40282cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 403686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 404686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 40580d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 40682cd038dSYoshinobu Inoue return (IPPROTO_DONE); 40782cd038dSYoshinobu Inoue } 40806cd0a3fSHajimu UMEMOTO } else if (fragoff + frgpartlen > IPV6_MAXPACKET) { 40982cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 410686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 411686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 41280d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 41382cd038dSYoshinobu Inoue return (IPPROTO_DONE); 41482cd038dSYoshinobu Inoue } 41582cd038dSYoshinobu Inoue /* 41682cd038dSYoshinobu Inoue * If it's the first fragment, do the above check for each 41782cd038dSYoshinobu Inoue * fragment already stored in the reassembly queue. 41882cd038dSYoshinobu Inoue */ 41982cd038dSYoshinobu Inoue if (fragoff == 0) { 42082cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 42182cd038dSYoshinobu Inoue af6 = af6dwn) { 42282cd038dSYoshinobu Inoue af6dwn = af6->ip6af_down; 42382cd038dSYoshinobu Inoue 42482cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + af6->ip6af_off + af6->ip6af_frglen > 42582cd038dSYoshinobu Inoue IPV6_MAXPACKET) { 42682cd038dSYoshinobu Inoue struct mbuf *merr = IP6_REASS_MBUF(af6); 42782cd038dSYoshinobu Inoue struct ip6_hdr *ip6err; 42882cd038dSYoshinobu Inoue int erroff = af6->ip6af_offset; 42982cd038dSYoshinobu Inoue 43082cd038dSYoshinobu Inoue /* dequeue the fragment. */ 43180d7a853SJonathan T. Looney frag6_deq(af6, hash); 432686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 43382cd038dSYoshinobu Inoue 43482cd038dSYoshinobu Inoue /* adjust pointer. */ 43582cd038dSYoshinobu Inoue ip6err = mtod(merr, struct ip6_hdr *); 43682cd038dSYoshinobu Inoue 43782cd038dSYoshinobu Inoue /* 43882cd038dSYoshinobu Inoue * Restore source and destination addresses 43982cd038dSYoshinobu Inoue * in the erroneous IPv6 header. 44082cd038dSYoshinobu Inoue */ 44182cd038dSYoshinobu Inoue ip6err->ip6_src = q6->ip6q_src; 44282cd038dSYoshinobu Inoue ip6err->ip6_dst = q6->ip6q_dst; 44382cd038dSYoshinobu Inoue 44482cd038dSYoshinobu Inoue icmp6_error(merr, ICMP6_PARAM_PROB, 44582cd038dSYoshinobu Inoue ICMP6_PARAMPROB_HEADER, 446686cdd19SJun-ichiro itojun Hagino erroff - sizeof(struct ip6_frag) + 447686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 44882cd038dSYoshinobu Inoue } 44982cd038dSYoshinobu Inoue } 45082cd038dSYoshinobu Inoue } 45182cd038dSYoshinobu Inoue 452686cdd19SJun-ichiro itojun Hagino ip6af = (struct ip6asfrag *)malloc(sizeof(struct ip6asfrag), M_FTABLE, 4538c0dd0e4SHajimu UMEMOTO M_NOWAIT); 454686cdd19SJun-ichiro itojun Hagino if (ip6af == NULL) 455686cdd19SJun-ichiro itojun Hagino goto dropfrag; 456686cdd19SJun-ichiro itojun Hagino bzero(ip6af, sizeof(*ip6af)); 45782cd038dSYoshinobu Inoue ip6af->ip6af_mff = ip6f->ip6f_offlg & IP6F_MORE_FRAG; 45882cd038dSYoshinobu Inoue ip6af->ip6af_off = fragoff; 45982cd038dSYoshinobu Inoue ip6af->ip6af_frglen = frgpartlen; 46082cd038dSYoshinobu Inoue ip6af->ip6af_offset = offset; 46182cd038dSYoshinobu Inoue IP6_REASS_MBUF(ip6af) = m; 46282cd038dSYoshinobu Inoue 46382cd038dSYoshinobu Inoue if (first_frag) { 46482cd038dSYoshinobu Inoue af6 = (struct ip6asfrag *)q6; 46582cd038dSYoshinobu Inoue goto insert; 46682cd038dSYoshinobu Inoue } 46782cd038dSYoshinobu Inoue 46882cd038dSYoshinobu Inoue /* 46959dfcba4SHajimu UMEMOTO * Handle ECN by comparing this segment with the first one; 47059dfcba4SHajimu UMEMOTO * if CE is set, do not lose CE. 47159dfcba4SHajimu UMEMOTO * drop if CE and not-ECT are mixed for the same packet. 47259dfcba4SHajimu UMEMOTO */ 47359dfcba4SHajimu UMEMOTO ecn = (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 4745e9510e3SJINMEI Tatuya ecn0 = q6->ip6q_ecn; 47559dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_CE) { 47659dfcba4SHajimu UMEMOTO if (ecn0 == IPTOS_ECN_NOTECT) { 47759dfcba4SHajimu UMEMOTO free(ip6af, M_FTABLE); 47859dfcba4SHajimu UMEMOTO goto dropfrag; 47959dfcba4SHajimu UMEMOTO } 48059dfcba4SHajimu UMEMOTO if (ecn0 != IPTOS_ECN_CE) 4815e9510e3SJINMEI Tatuya q6->ip6q_ecn = IPTOS_ECN_CE; 48259dfcba4SHajimu UMEMOTO } 48359dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT) { 48459dfcba4SHajimu UMEMOTO free(ip6af, M_FTABLE); 48559dfcba4SHajimu UMEMOTO goto dropfrag; 48659dfcba4SHajimu UMEMOTO } 48759dfcba4SHajimu UMEMOTO 48859dfcba4SHajimu UMEMOTO /* 48982cd038dSYoshinobu Inoue * Find a segment which begins after this one does. 49082cd038dSYoshinobu Inoue */ 49182cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 49282cd038dSYoshinobu Inoue af6 = af6->ip6af_down) 49382cd038dSYoshinobu Inoue if (af6->ip6af_off > ip6af->ip6af_off) 49482cd038dSYoshinobu Inoue break; 49582cd038dSYoshinobu Inoue 496686cdd19SJun-ichiro itojun Hagino #if 0 497686cdd19SJun-ichiro itojun Hagino /* 498686cdd19SJun-ichiro itojun Hagino * If there is a preceding segment, it may provide some of 499686cdd19SJun-ichiro itojun Hagino * our data already. If so, drop the data from the incoming 500686cdd19SJun-ichiro itojun Hagino * segment. If it provides all of our data, drop us. 501686cdd19SJun-ichiro itojun Hagino */ 502686cdd19SJun-ichiro itojun Hagino if (af6->ip6af_up != (struct ip6asfrag *)q6) { 503686cdd19SJun-ichiro itojun Hagino i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 504686cdd19SJun-ichiro itojun Hagino - ip6af->ip6af_off; 505686cdd19SJun-ichiro itojun Hagino if (i > 0) { 506686cdd19SJun-ichiro itojun Hagino if (i >= ip6af->ip6af_frglen) 507686cdd19SJun-ichiro itojun Hagino goto dropfrag; 508686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(ip6af), i); 509686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off += i; 510686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_frglen -= i; 511686cdd19SJun-ichiro itojun Hagino } 512686cdd19SJun-ichiro itojun Hagino } 513686cdd19SJun-ichiro itojun Hagino 514686cdd19SJun-ichiro itojun Hagino /* 515686cdd19SJun-ichiro itojun Hagino * While we overlap succeeding segments trim them or, 516686cdd19SJun-ichiro itojun Hagino * if they are completely covered, dequeue them. 517686cdd19SJun-ichiro itojun Hagino */ 518686cdd19SJun-ichiro itojun Hagino while (af6 != (struct ip6asfrag *)q6 && 519686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off + ip6af->ip6af_frglen > af6->ip6af_off) { 520686cdd19SJun-ichiro itojun Hagino i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 521686cdd19SJun-ichiro itojun Hagino if (i < af6->ip6af_frglen) { 522686cdd19SJun-ichiro itojun Hagino af6->ip6af_frglen -= i; 523686cdd19SJun-ichiro itojun Hagino af6->ip6af_off += i; 524686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(af6), i); 525686cdd19SJun-ichiro itojun Hagino break; 526686cdd19SJun-ichiro itojun Hagino } 527686cdd19SJun-ichiro itojun Hagino af6 = af6->ip6af_down; 528686cdd19SJun-ichiro itojun Hagino m_freem(IP6_REASS_MBUF(af6->ip6af_up)); 52980d7a853SJonathan T. Looney frag6_deq(af6->ip6af_up, hash); 530686cdd19SJun-ichiro itojun Hagino } 531686cdd19SJun-ichiro itojun Hagino #else 53282cd038dSYoshinobu Inoue /* 53382cd038dSYoshinobu Inoue * If the incoming framgent overlaps some existing fragments in 53482cd038dSYoshinobu Inoue * the reassembly queue, drop it, since it is dangerous to override 53582cd038dSYoshinobu Inoue * existing fragments from a security point of view. 5369888c401SHajimu UMEMOTO * We don't know which fragment is the bad guy - here we trust 5379888c401SHajimu UMEMOTO * fragment that came in earlier, with no real reason. 5385e9510e3SJINMEI Tatuya * 5395e9510e3SJINMEI Tatuya * Note: due to changes after disabling this part, mbuf passed to 5405e9510e3SJINMEI Tatuya * m_adj() below now does not meet the requirement. 54182cd038dSYoshinobu Inoue */ 54282cd038dSYoshinobu Inoue if (af6->ip6af_up != (struct ip6asfrag *)q6) { 54382cd038dSYoshinobu Inoue i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 54482cd038dSYoshinobu Inoue - ip6af->ip6af_off; 54582cd038dSYoshinobu Inoue if (i > 0) { 5462bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 54782cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 54882cd038dSYoshinobu Inoue "overlaps the previous fragment\n", 5491d54aa3bSBjoern A. Zeeb i, ip6_sprintf(ip6buf, &q6->ip6q_src)); 5502bf76779SMunechika SUMIKAWA #endif 5512bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 55282cd038dSYoshinobu Inoue goto dropfrag; 55382cd038dSYoshinobu Inoue } 55482cd038dSYoshinobu Inoue } 55582cd038dSYoshinobu Inoue if (af6 != (struct ip6asfrag *)q6) { 55682cd038dSYoshinobu Inoue i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 55782cd038dSYoshinobu Inoue if (i > 0) { 5582bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 55982cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 56082cd038dSYoshinobu Inoue "overlaps the succeeding fragment", 5611d54aa3bSBjoern A. Zeeb i, ip6_sprintf(ip6buf, &q6->ip6q_src)); 5622bf76779SMunechika SUMIKAWA #endif 5632bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 56482cd038dSYoshinobu Inoue goto dropfrag; 56582cd038dSYoshinobu Inoue } 56682cd038dSYoshinobu Inoue } 567686cdd19SJun-ichiro itojun Hagino #endif 56882cd038dSYoshinobu Inoue 56982cd038dSYoshinobu Inoue insert: 5704b908c8bSRobert Watson #ifdef MAC 5714b908c8bSRobert Watson if (!first_frag) 5724b908c8bSRobert Watson mac_ip6q_update(m, q6); 5734b908c8bSRobert Watson #endif 57482cd038dSYoshinobu Inoue 57582cd038dSYoshinobu Inoue /* 57682cd038dSYoshinobu Inoue * Stick new segment in its place; 57782cd038dSYoshinobu Inoue * check for complete reassembly. 57803c99d76SJonathan T. Looney * If not complete, check fragment limit. 57982cd038dSYoshinobu Inoue * Move to front of packet queue, as we are 58082cd038dSYoshinobu Inoue * the most recently active fragmented packet. 58182cd038dSYoshinobu Inoue */ 58280d7a853SJonathan T. Looney frag6_enq(ip6af, af6->ip6af_up, hash); 5832adfd64fSJonathan T. Looney atomic_add_int(&frag6_nfrags, 1); 5849888c401SHajimu UMEMOTO q6->ip6q_nfrag++; 585686cdd19SJun-ichiro itojun Hagino #if 0 /* xxx */ 58680d7a853SJonathan T. Looney if (q6 != head->ip6q_next) { 58780d7a853SJonathan T. Looney frag6_remque(q6, hash); 58880d7a853SJonathan T. Looney frag6_insque_head(q6, head, hash); 589686cdd19SJun-ichiro itojun Hagino } 590686cdd19SJun-ichiro itojun Hagino #endif 59182cd038dSYoshinobu Inoue next = 0; 59282cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 59382cd038dSYoshinobu Inoue af6 = af6->ip6af_down) { 59482cd038dSYoshinobu Inoue if (af6->ip6af_off != next) { 59503c99d76SJonathan T. Looney if (q6->ip6q_nfrag > V_ip6_maxfragsperpacket) { 596198fdaedSTom Jones IP6STAT_ADD(ip6s_fragdropped, q6->ip6q_nfrag); 59703c99d76SJonathan T. Looney frag6_freef(q6, hash); 59803c99d76SJonathan T. Looney } 59980d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 60082cd038dSYoshinobu Inoue return IPPROTO_DONE; 60182cd038dSYoshinobu Inoue } 60282cd038dSYoshinobu Inoue next += af6->ip6af_frglen; 60382cd038dSYoshinobu Inoue } 60482cd038dSYoshinobu Inoue if (af6->ip6af_up->ip6af_mff) { 60503c99d76SJonathan T. Looney if (q6->ip6q_nfrag > V_ip6_maxfragsperpacket) { 606198fdaedSTom Jones IP6STAT_ADD(ip6s_fragdropped, q6->ip6q_nfrag); 60703c99d76SJonathan T. Looney frag6_freef(q6, hash); 60803c99d76SJonathan T. Looney } 60980d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 61082cd038dSYoshinobu Inoue return IPPROTO_DONE; 61182cd038dSYoshinobu Inoue } 61282cd038dSYoshinobu Inoue 61382cd038dSYoshinobu Inoue /* 61482cd038dSYoshinobu Inoue * Reassembly is complete; concatenate fragments. 61582cd038dSYoshinobu Inoue */ 61682cd038dSYoshinobu Inoue ip6af = q6->ip6q_down; 61782cd038dSYoshinobu Inoue t = m = IP6_REASS_MBUF(ip6af); 61882cd038dSYoshinobu Inoue af6 = ip6af->ip6af_down; 61980d7a853SJonathan T. Looney frag6_deq(ip6af, hash); 62082cd038dSYoshinobu Inoue while (af6 != (struct ip6asfrag *)q6) { 6219907aba3SAndrey V. Elsukov m->m_pkthdr.csum_flags &= 6229907aba3SAndrey V. Elsukov IP6_REASS_MBUF(af6)->m_pkthdr.csum_flags; 6239907aba3SAndrey V. Elsukov m->m_pkthdr.csum_data += 6249907aba3SAndrey V. Elsukov IP6_REASS_MBUF(af6)->m_pkthdr.csum_data; 6259907aba3SAndrey V. Elsukov 626686cdd19SJun-ichiro itojun Hagino af6dwn = af6->ip6af_down; 62780d7a853SJonathan T. Looney frag6_deq(af6, hash); 62882cd038dSYoshinobu Inoue while (t->m_next) 62982cd038dSYoshinobu Inoue t = t->m_next; 630ba99cc0bSAlexander V. Chernikov m_adj(IP6_REASS_MBUF(af6), af6->ip6af_offset); 63109b0b8c0SNavdeep Parhar m_demote_pkthdr(IP6_REASS_MBUF(af6)); 632ba99cc0bSAlexander V. Chernikov m_cat(t, IP6_REASS_MBUF(af6)); 633686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 634686cdd19SJun-ichiro itojun Hagino af6 = af6dwn; 63582cd038dSYoshinobu Inoue } 63682cd038dSYoshinobu Inoue 6379907aba3SAndrey V. Elsukov while (m->m_pkthdr.csum_data & 0xffff0000) 6389907aba3SAndrey V. Elsukov m->m_pkthdr.csum_data = (m->m_pkthdr.csum_data & 0xffff) + 6399907aba3SAndrey V. Elsukov (m->m_pkthdr.csum_data >> 16); 6409907aba3SAndrey V. Elsukov 64182cd038dSYoshinobu Inoue /* adjust offset to point where the original next header starts */ 64282cd038dSYoshinobu Inoue offset = ip6af->ip6af_offset - sizeof(struct ip6_frag); 643686cdd19SJun-ichiro itojun Hagino free(ip6af, M_FTABLE); 644686cdd19SJun-ichiro itojun Hagino ip6 = mtod(m, struct ip6_hdr *); 64582cd038dSYoshinobu Inoue ip6->ip6_plen = htons((u_short)next + offset - sizeof(struct ip6_hdr)); 6465e9510e3SJINMEI Tatuya if (q6->ip6q_ecn == IPTOS_ECN_CE) 6475e9510e3SJINMEI Tatuya ip6->ip6_flow |= htonl(IPTOS_ECN_CE << 20); 64882cd038dSYoshinobu Inoue nxt = q6->ip6q_nxt; 649686cdd19SJun-ichiro itojun Hagino #ifdef notyet 650686cdd19SJun-ichiro itojun Hagino *q6->ip6q_nxtp = (u_char)(nxt & 0xff); 651686cdd19SJun-ichiro itojun Hagino #endif 65282cd038dSYoshinobu Inoue 6530b438b0fSGleb Smirnoff if (ip6_deletefraghdr(m, offset, M_NOWAIT) != 0) { 65480d7a853SJonathan T. Looney frag6_remque(q6, hash); 6552adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 6564b908c8bSRobert Watson #ifdef MAC 6574b908c8bSRobert Watson mac_ip6q_destroy(q6); 6584b908c8bSRobert Watson #endif 659686cdd19SJun-ichiro itojun Hagino free(q6, M_FTABLE); 66080d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 6610b438b0fSGleb Smirnoff 662686cdd19SJun-ichiro itojun Hagino goto dropfrag; 66382cd038dSYoshinobu Inoue } 66482cd038dSYoshinobu Inoue 66582cd038dSYoshinobu Inoue /* 66682cd038dSYoshinobu Inoue * Store NXT to the original. 66782cd038dSYoshinobu Inoue */ 66868e0e5a6SAndrey V. Elsukov m_copyback(m, ip6_get_prevhdr(m, offset), sizeof(uint8_t), 66968e0e5a6SAndrey V. Elsukov (caddr_t)&nxt); 67082cd038dSYoshinobu Inoue 67180d7a853SJonathan T. Looney frag6_remque(q6, hash); 6722adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 6734b908c8bSRobert Watson #ifdef MAC 6744b908c8bSRobert Watson mac_ip6q_reassemble(q6, m); 6754b908c8bSRobert Watson mac_ip6q_destroy(q6); 6764b908c8bSRobert Watson #endif 67782cd038dSYoshinobu Inoue free(q6, M_FTABLE); 67880d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 67982cd038dSYoshinobu Inoue 68082cd038dSYoshinobu Inoue if (m->m_flags & M_PKTHDR) { /* Isn't it always true? */ 68182cd038dSYoshinobu Inoue int plen = 0; 68282cd038dSYoshinobu Inoue for (t = m; t; t = t->m_next) 68382cd038dSYoshinobu Inoue plen += t->m_len; 68482cd038dSYoshinobu Inoue m->m_pkthdr.len = plen; 68582cd038dSYoshinobu Inoue } 68682cd038dSYoshinobu Inoue 687aaa46574SAdrian Chadd #ifdef RSS 688aaa46574SAdrian Chadd mtag = m_tag_alloc(MTAG_ABI_IPV6, IPV6_TAG_DIRECT, sizeof(*ip6dc), 689aaa46574SAdrian Chadd M_NOWAIT); 690aaa46574SAdrian Chadd if (mtag == NULL) 691aaa46574SAdrian Chadd goto dropfrag; 692aaa46574SAdrian Chadd 693aaa46574SAdrian Chadd ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 694aaa46574SAdrian Chadd ip6dc->ip6dc_nxt = nxt; 695aaa46574SAdrian Chadd ip6dc->ip6dc_off = offset; 696aaa46574SAdrian Chadd 697aaa46574SAdrian Chadd m_tag_prepend(m, mtag); 698aaa46574SAdrian Chadd #endif 699aaa46574SAdrian Chadd 70080d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 7019cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_reassembled); 70282cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_ok); 70382cd038dSYoshinobu Inoue 704aaa46574SAdrian Chadd #ifdef RSS 705aaa46574SAdrian Chadd /* 706aaa46574SAdrian Chadd * Queue/dispatch for reprocessing. 707aaa46574SAdrian Chadd */ 708aaa46574SAdrian Chadd netisr_dispatch(NETISR_IPV6_DIRECT, m); 709aaa46574SAdrian Chadd return IPPROTO_DONE; 710aaa46574SAdrian Chadd #endif 711aaa46574SAdrian Chadd 71282cd038dSYoshinobu Inoue /* 71382cd038dSYoshinobu Inoue * Tell launch routine the next header 71482cd038dSYoshinobu Inoue */ 71582cd038dSYoshinobu Inoue 71682cd038dSYoshinobu Inoue *mp = m; 71782cd038dSYoshinobu Inoue *offp = offset; 71882cd038dSYoshinobu Inoue 71982cd038dSYoshinobu Inoue return nxt; 72082cd038dSYoshinobu Inoue 72182cd038dSYoshinobu Inoue dropfrag: 72280d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 72382cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 7249cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 72582cd038dSYoshinobu Inoue m_freem(m); 72682cd038dSYoshinobu Inoue return IPPROTO_DONE; 72782cd038dSYoshinobu Inoue } 72882cd038dSYoshinobu Inoue 72982cd038dSYoshinobu Inoue /* 73082cd038dSYoshinobu Inoue * Free a fragment reassembly header and all 73182cd038dSYoshinobu Inoue * associated datagrams. 73282cd038dSYoshinobu Inoue */ 73380d7a853SJonathan T. Looney static void 73480d7a853SJonathan T. Looney frag6_freef(struct ip6q *q6, uint32_t bucket) 73582cd038dSYoshinobu Inoue { 73682cd038dSYoshinobu Inoue struct ip6asfrag *af6, *down6; 73782cd038dSYoshinobu Inoue 73880d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 7399888c401SHajimu UMEMOTO 74082cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 74182cd038dSYoshinobu Inoue af6 = down6) { 74282cd038dSYoshinobu Inoue struct mbuf *m = IP6_REASS_MBUF(af6); 74382cd038dSYoshinobu Inoue 74482cd038dSYoshinobu Inoue down6 = af6->ip6af_down; 74580d7a853SJonathan T. Looney frag6_deq(af6, bucket); 74682cd038dSYoshinobu Inoue 74782cd038dSYoshinobu Inoue /* 74882cd038dSYoshinobu Inoue * Return ICMP time exceeded error for the 1st fragment. 74982cd038dSYoshinobu Inoue * Just free other fragments. 75082cd038dSYoshinobu Inoue */ 75182cd038dSYoshinobu Inoue if (af6->ip6af_off == 0) { 75282cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 75382cd038dSYoshinobu Inoue 75482cd038dSYoshinobu Inoue /* adjust pointer */ 75582cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 75682cd038dSYoshinobu Inoue 75706cd0a3fSHajimu UMEMOTO /* restore source and destination addresses */ 75882cd038dSYoshinobu Inoue ip6->ip6_src = q6->ip6q_src; 75982cd038dSYoshinobu Inoue ip6->ip6_dst = q6->ip6q_dst; 76082cd038dSYoshinobu Inoue 76182cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_TIME_EXCEEDED, 76282cd038dSYoshinobu Inoue ICMP6_TIME_EXCEED_REASSEMBLY, 0); 763686cdd19SJun-ichiro itojun Hagino } else 76482cd038dSYoshinobu Inoue m_freem(m); 765686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 76682cd038dSYoshinobu Inoue } 76780d7a853SJonathan T. Looney frag6_remque(q6, bucket); 7682adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 7694b908c8bSRobert Watson #ifdef MAC 7704b908c8bSRobert Watson mac_ip6q_destroy(q6); 7714b908c8bSRobert Watson #endif 77282cd038dSYoshinobu Inoue free(q6, M_FTABLE); 77380d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 77482cd038dSYoshinobu Inoue } 77582cd038dSYoshinobu Inoue 77682cd038dSYoshinobu Inoue /* 77782cd038dSYoshinobu Inoue * Put an ip fragment on a reassembly chain. 77882cd038dSYoshinobu Inoue * Like insque, but pointers in middle of structure. 77982cd038dSYoshinobu Inoue */ 78080d7a853SJonathan T. Looney static void 78180d7a853SJonathan T. Looney frag6_enq(struct ip6asfrag *af6, struct ip6asfrag *up6, 78280d7a853SJonathan T. Looney uint32_t bucket __unused) 78382cd038dSYoshinobu Inoue { 7849888c401SHajimu UMEMOTO 78580d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 7869888c401SHajimu UMEMOTO 78782cd038dSYoshinobu Inoue af6->ip6af_up = up6; 78882cd038dSYoshinobu Inoue af6->ip6af_down = up6->ip6af_down; 78982cd038dSYoshinobu Inoue up6->ip6af_down->ip6af_up = af6; 79082cd038dSYoshinobu Inoue up6->ip6af_down = af6; 79182cd038dSYoshinobu Inoue } 79282cd038dSYoshinobu Inoue 79382cd038dSYoshinobu Inoue /* 79482cd038dSYoshinobu Inoue * To frag6_enq as remque is to insque. 79582cd038dSYoshinobu Inoue */ 79680d7a853SJonathan T. Looney static void 79780d7a853SJonathan T. Looney frag6_deq(struct ip6asfrag *af6, uint32_t bucket __unused) 79882cd038dSYoshinobu Inoue { 7999888c401SHajimu UMEMOTO 80080d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 8019888c401SHajimu UMEMOTO 80282cd038dSYoshinobu Inoue af6->ip6af_up->ip6af_down = af6->ip6af_down; 80382cd038dSYoshinobu Inoue af6->ip6af_down->ip6af_up = af6->ip6af_up; 80482cd038dSYoshinobu Inoue } 80582cd038dSYoshinobu Inoue 80680d7a853SJonathan T. Looney static void 8071e9f3b73SJonathan T. Looney frag6_insque_head(struct ip6q *new, struct ip6q *old, uint32_t bucket) 80882cd038dSYoshinobu Inoue { 8099888c401SHajimu UMEMOTO 81080d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 81180d7a853SJonathan T. Looney KASSERT(IP6Q_HEAD(bucket) == old, 81280d7a853SJonathan T. Looney ("%s: attempt to insert at head of wrong bucket" 81380d7a853SJonathan T. Looney " (bucket=%u, old=%p)", __func__, bucket, old)); 8149888c401SHajimu UMEMOTO 81582cd038dSYoshinobu Inoue new->ip6q_prev = old; 81682cd038dSYoshinobu Inoue new->ip6q_next = old->ip6q_next; 81782cd038dSYoshinobu Inoue old->ip6q_next->ip6q_prev= new; 81882cd038dSYoshinobu Inoue old->ip6q_next = new; 8191e9f3b73SJonathan T. Looney V_ip6q[bucket].count++; 82082cd038dSYoshinobu Inoue } 82182cd038dSYoshinobu Inoue 82280d7a853SJonathan T. Looney static void 8231e9f3b73SJonathan T. Looney frag6_remque(struct ip6q *p6, uint32_t bucket) 82482cd038dSYoshinobu Inoue { 8259888c401SHajimu UMEMOTO 82680d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 8279888c401SHajimu UMEMOTO 82882cd038dSYoshinobu Inoue p6->ip6q_prev->ip6q_next = p6->ip6q_next; 82982cd038dSYoshinobu Inoue p6->ip6q_next->ip6q_prev = p6->ip6q_prev; 8301e9f3b73SJonathan T. Looney V_ip6q[bucket].count--; 83182cd038dSYoshinobu Inoue } 83282cd038dSYoshinobu Inoue 83382cd038dSYoshinobu Inoue /* 83433841545SHajimu UMEMOTO * IPv6 reassembling timer processing; 83582cd038dSYoshinobu Inoue * if a timer expires on a reassembly 83682cd038dSYoshinobu Inoue * queue, discard it. 83782cd038dSYoshinobu Inoue */ 83882cd038dSYoshinobu Inoue void 8391272577eSXin LI frag6_slowtimo(void) 84082cd038dSYoshinobu Inoue { 8418b615593SMarko Zec VNET_ITERATOR_DECL(vnet_iter); 84280d7a853SJonathan T. Looney struct ip6q *head, *q6; 84380d7a853SJonathan T. Looney int i; 84482cd038dSYoshinobu Inoue 8455ee847d3SRobert Watson VNET_LIST_RLOCK_NOSLEEP(); 8468b615593SMarko Zec VNET_FOREACH(vnet_iter) { 8478b615593SMarko Zec CURVNET_SET(vnet_iter); 84880d7a853SJonathan T. Looney for (i = 0; i < IP6REASS_NHASH; i++) { 84980d7a853SJonathan T. Looney IP6Q_LOCK(i); 85080d7a853SJonathan T. Looney head = IP6Q_HEAD(i); 85180d7a853SJonathan T. Looney q6 = head->ip6q_next; 8521e9f3b73SJonathan T. Looney if (q6 == NULL) { 8531e9f3b73SJonathan T. Looney /* 8541e9f3b73SJonathan T. Looney * XXXJTL: This should never happen. This 8551e9f3b73SJonathan T. Looney * should turn into an assertion. 8561e9f3b73SJonathan T. Looney */ 8571e9f3b73SJonathan T. Looney IP6Q_UNLOCK(i); 8581e9f3b73SJonathan T. Looney continue; 8591e9f3b73SJonathan T. Looney } 86080d7a853SJonathan T. Looney while (q6 != head) { 86182cd038dSYoshinobu Inoue --q6->ip6q_ttl; 86282cd038dSYoshinobu Inoue q6 = q6->ip6q_next; 86382cd038dSYoshinobu Inoue if (q6->ip6q_prev->ip6q_ttl == 0) { 864198fdaedSTom Jones IP6STAT_ADD(ip6s_fragtimeout, 865198fdaedSTom Jones q6->ip6q_prev->ip6q_nfrag); 86682cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 86780d7a853SJonathan T. Looney frag6_freef(q6->ip6q_prev, i); 86882cd038dSYoshinobu Inoue } 86982cd038dSYoshinobu Inoue } 87082cd038dSYoshinobu Inoue /* 87182cd038dSYoshinobu Inoue * If we are over the maximum number of fragments 87282cd038dSYoshinobu Inoue * (due to the limit being lowered), drain off 87382cd038dSYoshinobu Inoue * enough to get down to the new limit. 8741e9f3b73SJonathan T. Looney * Note that we drain all reassembly queues if 8751e9f3b73SJonathan T. Looney * maxfragpackets is 0 (fragmentation is disabled), 8761e9f3b73SJonathan T. Looney * and don't enforce a limit when maxfragpackets 8771e9f3b73SJonathan T. Looney * is negative. 87882cd038dSYoshinobu Inoue */ 8791e9f3b73SJonathan T. Looney while ((V_ip6_maxfragpackets == 0 || 8801e9f3b73SJonathan T. Looney (V_ip6_maxfragpackets > 0 && 8811e9f3b73SJonathan T. Looney V_ip6q[i].count > V_ip6_maxfragbucketsize)) && 88280d7a853SJonathan T. Looney head->ip6q_prev != head) { 883198fdaedSTom Jones IP6STAT_ADD(ip6s_fragoverflow, 884198fdaedSTom Jones q6->ip6q_prev->ip6q_nfrag); 88582cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 88680d7a853SJonathan T. Looney frag6_freef(head->ip6q_prev, i); 88780d7a853SJonathan T. Looney } 88880d7a853SJonathan T. Looney IP6Q_UNLOCK(i); 88982cd038dSYoshinobu Inoue } 8901e9f3b73SJonathan T. Looney /* 8911e9f3b73SJonathan T. Looney * If we are still over the maximum number of fragmented 8921e9f3b73SJonathan T. Looney * packets, drain off enough to get down to the new limit. 8931e9f3b73SJonathan T. Looney */ 8941e9f3b73SJonathan T. Looney i = 0; 8951e9f3b73SJonathan T. Looney while (V_ip6_maxfragpackets >= 0 && 8961e9f3b73SJonathan T. Looney atomic_load_int(&V_frag6_nfragpackets) > 8971e9f3b73SJonathan T. Looney (u_int)V_ip6_maxfragpackets) { 8981e9f3b73SJonathan T. Looney IP6Q_LOCK(i); 8991e9f3b73SJonathan T. Looney head = IP6Q_HEAD(i); 9001e9f3b73SJonathan T. Looney if (head->ip6q_prev != head) { 901198fdaedSTom Jones IP6STAT_ADD(ip6s_fragoverflow, 902198fdaedSTom Jones q6->ip6q_prev->ip6q_nfrag); 9031e9f3b73SJonathan T. Looney /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 9041e9f3b73SJonathan T. Looney frag6_freef(head->ip6q_prev, i); 9051e9f3b73SJonathan T. Looney } 9061e9f3b73SJonathan T. Looney IP6Q_UNLOCK(i); 9071e9f3b73SJonathan T. Looney i = (i + 1) % IP6REASS_NHASH; 9081e9f3b73SJonathan T. Looney } 9098b615593SMarko Zec CURVNET_RESTORE(); 9108b615593SMarko Zec } 9115ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 91282cd038dSYoshinobu Inoue } 91382cd038dSYoshinobu Inoue 91482cd038dSYoshinobu Inoue /* 91582cd038dSYoshinobu Inoue * Drain off all datagram fragments. 91682cd038dSYoshinobu Inoue */ 91782cd038dSYoshinobu Inoue void 9181272577eSXin LI frag6_drain(void) 91982cd038dSYoshinobu Inoue { 9208b615593SMarko Zec VNET_ITERATOR_DECL(vnet_iter); 92180d7a853SJonathan T. Looney struct ip6q *head; 92280d7a853SJonathan T. Looney int i; 9239888c401SHajimu UMEMOTO 9245ee847d3SRobert Watson VNET_LIST_RLOCK_NOSLEEP(); 9258b615593SMarko Zec VNET_FOREACH(vnet_iter) { 9268b615593SMarko Zec CURVNET_SET(vnet_iter); 92780d7a853SJonathan T. Looney for (i = 0; i < IP6REASS_NHASH; i++) { 92880d7a853SJonathan T. Looney if (IP6Q_TRYLOCK(i) == 0) 92980d7a853SJonathan T. Looney continue; 93080d7a853SJonathan T. Looney head = IP6Q_HEAD(i); 93180d7a853SJonathan T. Looney while (head->ip6q_next != head) { 9329cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 93382cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 93480d7a853SJonathan T. Looney frag6_freef(head->ip6q_next, i); 93580d7a853SJonathan T. Looney } 93680d7a853SJonathan T. Looney IP6Q_UNLOCK(i); 93782cd038dSYoshinobu Inoue } 9388b615593SMarko Zec CURVNET_RESTORE(); 9398b615593SMarko Zec } 9405ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 94182cd038dSYoshinobu Inoue } 942e5ee7060SGleb Smirnoff 943e5ee7060SGleb Smirnoff int 944e5ee7060SGleb Smirnoff ip6_deletefraghdr(struct mbuf *m, int offset, int wait) 945e5ee7060SGleb Smirnoff { 946e5ee7060SGleb Smirnoff struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 947e5ee7060SGleb Smirnoff struct mbuf *t; 948e5ee7060SGleb Smirnoff 949e5ee7060SGleb Smirnoff /* Delete frag6 header. */ 950e5ee7060SGleb Smirnoff if (m->m_len >= offset + sizeof(struct ip6_frag)) { 951e5ee7060SGleb Smirnoff /* This is the only possible case with !PULLDOWN_TEST. */ 952e5ee7060SGleb Smirnoff bcopy(ip6, (char *)ip6 + sizeof(struct ip6_frag), 953e5ee7060SGleb Smirnoff offset); 954e5ee7060SGleb Smirnoff m->m_data += sizeof(struct ip6_frag); 955e5ee7060SGleb Smirnoff m->m_len -= sizeof(struct ip6_frag); 956e5ee7060SGleb Smirnoff } else { 957e5ee7060SGleb Smirnoff /* This comes with no copy if the boundary is on cluster. */ 958e5ee7060SGleb Smirnoff if ((t = m_split(m, offset, wait)) == NULL) 959e5ee7060SGleb Smirnoff return (ENOMEM); 960e5ee7060SGleb Smirnoff m_adj(t, sizeof(struct ip6_frag)); 961e5ee7060SGleb Smirnoff m_cat(m, t); 962e5ee7060SGleb Smirnoff } 963e5ee7060SGleb Smirnoff 964a4061289SAndrey V. Elsukov m->m_flags |= M_FRAGMENTED; 965e5ee7060SGleb Smirnoff return (0); 966e5ee7060SGleb Smirnoff } 967