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 */ 22180d7a853SJonathan T. Looney uint32_t hash, hashkey[sizeof(struct in6_addr) * 2 + 1], *hashkeyp; 22282cd038dSYoshinobu Inoue struct ifnet *dstifp; 22359dfcba4SHajimu UMEMOTO u_int8_t ecn, ecn0; 224aaa46574SAdrian Chadd #ifdef RSS 225aaa46574SAdrian Chadd struct m_tag *mtag; 226aaa46574SAdrian Chadd struct ip6_direct_ctx *ip6dc; 227aaa46574SAdrian Chadd #endif 228aaa46574SAdrian Chadd 2291d54aa3bSBjoern A. Zeeb #if 0 2301d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 2311d54aa3bSBjoern A. Zeeb #endif 23282cd038dSYoshinobu Inoue 23382cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 234686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 235686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), IPPROTO_DONE); 23682cd038dSYoshinobu Inoue ip6f = (struct ip6_frag *)((caddr_t)ip6 + offset); 237686cdd19SJun-ichiro itojun Hagino #else 238686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(ip6f, struct ip6_frag *, m, offset, sizeof(*ip6f)); 239686cdd19SJun-ichiro itojun Hagino if (ip6f == NULL) 24040e39bbbSHajimu UMEMOTO return (IPPROTO_DONE); 241686cdd19SJun-ichiro itojun Hagino #endif 24282cd038dSYoshinobu Inoue 24382cd038dSYoshinobu Inoue dstifp = NULL; 24482cd038dSYoshinobu Inoue /* find the destination interface of the packet. */ 2453e88eb90SAndrey V. Elsukov ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 2463e88eb90SAndrey V. Elsukov if (ia != NULL) { 2472a5aafceSHajimu UMEMOTO dstifp = ia->ia_ifp; 2488c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 2498c0fec80SRobert Watson } 25082cd038dSYoshinobu Inoue /* jumbo payload can't contain a fragment header */ 25182cd038dSYoshinobu Inoue if (ip6->ip6_plen == 0) { 25282cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, offset); 25382cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 25482cd038dSYoshinobu Inoue return IPPROTO_DONE; 25582cd038dSYoshinobu Inoue } 25682cd038dSYoshinobu Inoue 25782cd038dSYoshinobu Inoue /* 25882cd038dSYoshinobu Inoue * check whether fragment packet's fragment length is 25982cd038dSYoshinobu Inoue * multiple of 8 octets. 26082cd038dSYoshinobu Inoue * sizeof(struct ip6_frag) == 8 26182cd038dSYoshinobu Inoue * sizeof(struct ip6_hdr) = 40 26282cd038dSYoshinobu Inoue */ 26382cd038dSYoshinobu Inoue if ((ip6f->ip6f_offlg & IP6F_MORE_FRAG) && 26482cd038dSYoshinobu Inoue (((ntohs(ip6->ip6_plen) - offset) & 0x7) != 0)) { 26506cd0a3fSHajimu UMEMOTO icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 266686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_hdr, ip6_plen)); 26782cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 26882cd038dSYoshinobu Inoue return IPPROTO_DONE; 26982cd038dSYoshinobu Inoue } 27082cd038dSYoshinobu Inoue 2719cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragments); 27282cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_reqd); 27382cd038dSYoshinobu Inoue 274686cdd19SJun-ichiro itojun Hagino /* offset now points to data portion */ 27582cd038dSYoshinobu Inoue offset += sizeof(struct ip6_frag); 27682cd038dSYoshinobu Inoue 2774018ea9aSBjoern A. Zeeb /* 278fd291ae3SBjoern A. Zeeb * RFC 6946: Handle "atomic" fragments (offset and m bit set to 0) 279fd291ae3SBjoern A. Zeeb * upfront, unrelated to any reassembly. Just skip the fragment header. 2804018ea9aSBjoern A. Zeeb */ 2814018ea9aSBjoern A. Zeeb if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) { 2824018ea9aSBjoern A. Zeeb /* XXX-BZ we want dedicated counters for this. */ 2839cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_reassembled); 2844018ea9aSBjoern A. Zeeb in6_ifstat_inc(dstifp, ifs6_reass_ok); 2854018ea9aSBjoern A. Zeeb *offp = offset; 286a4061289SAndrey V. Elsukov m->m_flags |= M_FRAGMENTED; 2874018ea9aSBjoern A. Zeeb return (ip6f->ip6f_nxt); 2884018ea9aSBjoern A. Zeeb } 2894018ea9aSBjoern A. Zeeb 2905f9f192dSJonathan T. Looney /* Get fragment length and discard 0-byte fragments. */ 2915f9f192dSJonathan T. Looney frgpartlen = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - offset; 2925f9f192dSJonathan T. Looney if (frgpartlen == 0) { 2935f9f192dSJonathan T. Looney icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 2945f9f192dSJonathan T. Looney offsetof(struct ip6_hdr, ip6_plen)); 2955f9f192dSJonathan T. Looney in6_ifstat_inc(dstifp, ifs6_reass_fail); 2965f9f192dSJonathan T. Looney IP6STAT_INC(ip6s_fragdropped); 2975f9f192dSJonathan T. Looney return IPPROTO_DONE; 2985f9f192dSJonathan T. Looney } 2995f9f192dSJonathan T. Looney 30080d7a853SJonathan T. Looney hashkeyp = hashkey; 30180d7a853SJonathan T. Looney memcpy(hashkeyp, &ip6->ip6_src, sizeof(struct in6_addr)); 30280d7a853SJonathan T. Looney hashkeyp += sizeof(struct in6_addr) / sizeof(*hashkeyp); 30380d7a853SJonathan T. Looney memcpy(hashkeyp, &ip6->ip6_dst, sizeof(struct in6_addr)); 30480d7a853SJonathan T. Looney hashkeyp += sizeof(struct in6_addr) / sizeof(*hashkeyp); 30580d7a853SJonathan T. Looney *hashkeyp = ip6f->ip6f_ident; 30680d7a853SJonathan T. Looney hash = jenkins_hash32(hashkey, nitems(hashkey), V_ip6q_hashseed); 30780d7a853SJonathan T. Looney hash &= IP6REASS_HMASK; 30880d7a853SJonathan T. Looney head = IP6Q_HEAD(hash); 30980d7a853SJonathan T. Looney IP6Q_LOCK(hash); 3109888c401SHajimu UMEMOTO 3119888c401SHajimu UMEMOTO /* 3129888c401SHajimu UMEMOTO * Enforce upper bound on number of fragments. 3139888c401SHajimu UMEMOTO * If maxfrag is 0, never accept fragments. 3149888c401SHajimu UMEMOTO * If maxfrag is -1, accept all fragments without limitation. 3159888c401SHajimu UMEMOTO */ 3162adfd64fSJonathan T. Looney if (ip6_maxfrags < 0) 3179888c401SHajimu UMEMOTO ; 3182adfd64fSJonathan T. Looney else if (atomic_load_int(&frag6_nfrags) >= (u_int)ip6_maxfrags) 3199888c401SHajimu UMEMOTO goto dropfrag; 32033841545SHajimu UMEMOTO 32180d7a853SJonathan T. Looney for (q6 = head->ip6q_next; q6 != head; q6 = q6->ip6q_next) 32282cd038dSYoshinobu Inoue if (ip6f->ip6f_ident == q6->ip6q_ident && 32382cd038dSYoshinobu Inoue IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &q6->ip6q_src) && 3244b908c8bSRobert Watson IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &q6->ip6q_dst) 3254b908c8bSRobert Watson #ifdef MAC 3264b908c8bSRobert Watson && mac_ip6q_match(m, q6) 3274b908c8bSRobert Watson #endif 3284b908c8bSRobert Watson ) 32982cd038dSYoshinobu Inoue break; 33082cd038dSYoshinobu Inoue 33180d7a853SJonathan T. Looney if (q6 == head) { 33282cd038dSYoshinobu Inoue /* 33382cd038dSYoshinobu Inoue * the first fragment to arrive, create a reassembly queue. 33482cd038dSYoshinobu Inoue */ 33582cd038dSYoshinobu Inoue first_frag = 1; 33682cd038dSYoshinobu Inoue 33782cd038dSYoshinobu Inoue /* 33882cd038dSYoshinobu Inoue * Enforce upper bound on number of fragmented packets 33982cd038dSYoshinobu Inoue * for which we attempt reassembly; 3409888c401SHajimu UMEMOTO * If maxfragpackets is 0, never accept fragments. 3419888c401SHajimu UMEMOTO * If maxfragpackets is -1, accept all fragments without 3429888c401SHajimu UMEMOTO * limitation. 34382cd038dSYoshinobu Inoue */ 344603724d3SBjoern A. Zeeb if (V_ip6_maxfragpackets < 0) 34533841545SHajimu UMEMOTO ; 3461e9f3b73SJonathan T. Looney else if (V_ip6q[hash].count >= V_ip6_maxfragbucketsize || 3471e9f3b73SJonathan T. Looney atomic_load_int(&V_frag6_nfragpackets) >= 34880d7a853SJonathan T. Looney (u_int)V_ip6_maxfragpackets) 34933841545SHajimu UMEMOTO goto dropfrag; 35080d7a853SJonathan T. Looney atomic_add_int(&V_frag6_nfragpackets, 1); 35182cd038dSYoshinobu Inoue q6 = (struct ip6q *)malloc(sizeof(struct ip6q), M_FTABLE, 3528c0dd0e4SHajimu UMEMOTO M_NOWAIT); 35382cd038dSYoshinobu Inoue if (q6 == NULL) 35482cd038dSYoshinobu Inoue goto dropfrag; 355686cdd19SJun-ichiro itojun Hagino bzero(q6, sizeof(*q6)); 3564b908c8bSRobert Watson #ifdef MAC 3574b908c8bSRobert Watson if (mac_ip6q_init(q6, M_NOWAIT) != 0) { 3584b908c8bSRobert Watson free(q6, M_FTABLE); 3594b908c8bSRobert Watson goto dropfrag; 3604b908c8bSRobert Watson } 3614b908c8bSRobert Watson mac_ip6q_create(m, q6); 3624b908c8bSRobert Watson #endif 36380d7a853SJonathan T. Looney frag6_insque_head(q6, head, hash); 36482cd038dSYoshinobu Inoue 365686cdd19SJun-ichiro itojun Hagino /* ip6q_nxt will be filled afterwards, from 1st fragment */ 36682cd038dSYoshinobu Inoue q6->ip6q_down = q6->ip6q_up = (struct ip6asfrag *)q6; 367686cdd19SJun-ichiro itojun Hagino #ifdef notyet 368686cdd19SJun-ichiro itojun Hagino q6->ip6q_nxtp = (u_char *)nxtp; 369686cdd19SJun-ichiro itojun Hagino #endif 37082cd038dSYoshinobu Inoue q6->ip6q_ident = ip6f->ip6f_ident; 37182cd038dSYoshinobu Inoue q6->ip6q_ttl = IPV6_FRAGTTL; 37282cd038dSYoshinobu Inoue q6->ip6q_src = ip6->ip6_src; 37382cd038dSYoshinobu Inoue q6->ip6q_dst = ip6->ip6_dst; 3745e9510e3SJINMEI Tatuya q6->ip6q_ecn = 3755e9510e3SJINMEI Tatuya (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 37682cd038dSYoshinobu Inoue q6->ip6q_unfrglen = -1; /* The 1st fragment has not arrived. */ 3779888c401SHajimu UMEMOTO 3789888c401SHajimu UMEMOTO q6->ip6q_nfrag = 0; 37982cd038dSYoshinobu Inoue } 38082cd038dSYoshinobu Inoue 38182cd038dSYoshinobu Inoue /* 38282cd038dSYoshinobu Inoue * If it's the 1st fragment, record the length of the 38382cd038dSYoshinobu Inoue * unfragmentable part and the next header of the fragment header. 38482cd038dSYoshinobu Inoue */ 38582cd038dSYoshinobu Inoue fragoff = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK); 38682cd038dSYoshinobu Inoue if (fragoff == 0) { 38706cd0a3fSHajimu UMEMOTO q6->ip6q_unfrglen = offset - sizeof(struct ip6_hdr) - 38806cd0a3fSHajimu UMEMOTO sizeof(struct ip6_frag); 38982cd038dSYoshinobu Inoue q6->ip6q_nxt = ip6f->ip6f_nxt; 39082cd038dSYoshinobu Inoue } 39182cd038dSYoshinobu Inoue 39282cd038dSYoshinobu Inoue /* 39382cd038dSYoshinobu Inoue * Check that the reassembled packet would not exceed 65535 bytes 39482cd038dSYoshinobu Inoue * in size. 39582cd038dSYoshinobu Inoue * If it would exceed, discard the fragment and return an ICMP error. 39682cd038dSYoshinobu Inoue */ 39782cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen >= 0) { 39882cd038dSYoshinobu Inoue /* The 1st fragment has already arrived. */ 39982cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + fragoff + frgpartlen > IPV6_MAXPACKET) { 40082cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 401686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 402686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 40380d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 40482cd038dSYoshinobu Inoue return (IPPROTO_DONE); 40582cd038dSYoshinobu Inoue } 40606cd0a3fSHajimu UMEMOTO } else if (fragoff + frgpartlen > IPV6_MAXPACKET) { 40782cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 408686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 409686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 41080d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 41182cd038dSYoshinobu Inoue return (IPPROTO_DONE); 41282cd038dSYoshinobu Inoue } 41382cd038dSYoshinobu Inoue /* 41482cd038dSYoshinobu Inoue * If it's the first fragment, do the above check for each 41582cd038dSYoshinobu Inoue * fragment already stored in the reassembly queue. 41682cd038dSYoshinobu Inoue */ 41782cd038dSYoshinobu Inoue if (fragoff == 0) { 41882cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 41982cd038dSYoshinobu Inoue af6 = af6dwn) { 42082cd038dSYoshinobu Inoue af6dwn = af6->ip6af_down; 42182cd038dSYoshinobu Inoue 42282cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + af6->ip6af_off + af6->ip6af_frglen > 42382cd038dSYoshinobu Inoue IPV6_MAXPACKET) { 42482cd038dSYoshinobu Inoue struct mbuf *merr = IP6_REASS_MBUF(af6); 42582cd038dSYoshinobu Inoue struct ip6_hdr *ip6err; 42682cd038dSYoshinobu Inoue int erroff = af6->ip6af_offset; 42782cd038dSYoshinobu Inoue 42882cd038dSYoshinobu Inoue /* dequeue the fragment. */ 42980d7a853SJonathan T. Looney frag6_deq(af6, hash); 430686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 43182cd038dSYoshinobu Inoue 43282cd038dSYoshinobu Inoue /* adjust pointer. */ 43382cd038dSYoshinobu Inoue ip6err = mtod(merr, struct ip6_hdr *); 43482cd038dSYoshinobu Inoue 43582cd038dSYoshinobu Inoue /* 43682cd038dSYoshinobu Inoue * Restore source and destination addresses 43782cd038dSYoshinobu Inoue * in the erroneous IPv6 header. 43882cd038dSYoshinobu Inoue */ 43982cd038dSYoshinobu Inoue ip6err->ip6_src = q6->ip6q_src; 44082cd038dSYoshinobu Inoue ip6err->ip6_dst = q6->ip6q_dst; 44182cd038dSYoshinobu Inoue 44282cd038dSYoshinobu Inoue icmp6_error(merr, ICMP6_PARAM_PROB, 44382cd038dSYoshinobu Inoue ICMP6_PARAMPROB_HEADER, 444686cdd19SJun-ichiro itojun Hagino erroff - sizeof(struct ip6_frag) + 445686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 44682cd038dSYoshinobu Inoue } 44782cd038dSYoshinobu Inoue } 44882cd038dSYoshinobu Inoue } 44982cd038dSYoshinobu Inoue 450686cdd19SJun-ichiro itojun Hagino ip6af = (struct ip6asfrag *)malloc(sizeof(struct ip6asfrag), M_FTABLE, 4518c0dd0e4SHajimu UMEMOTO M_NOWAIT); 452686cdd19SJun-ichiro itojun Hagino if (ip6af == NULL) 453686cdd19SJun-ichiro itojun Hagino goto dropfrag; 454686cdd19SJun-ichiro itojun Hagino bzero(ip6af, sizeof(*ip6af)); 45582cd038dSYoshinobu Inoue ip6af->ip6af_mff = ip6f->ip6f_offlg & IP6F_MORE_FRAG; 45682cd038dSYoshinobu Inoue ip6af->ip6af_off = fragoff; 45782cd038dSYoshinobu Inoue ip6af->ip6af_frglen = frgpartlen; 45882cd038dSYoshinobu Inoue ip6af->ip6af_offset = offset; 45982cd038dSYoshinobu Inoue IP6_REASS_MBUF(ip6af) = m; 46082cd038dSYoshinobu Inoue 46182cd038dSYoshinobu Inoue if (first_frag) { 46282cd038dSYoshinobu Inoue af6 = (struct ip6asfrag *)q6; 46382cd038dSYoshinobu Inoue goto insert; 46482cd038dSYoshinobu Inoue } 46582cd038dSYoshinobu Inoue 46682cd038dSYoshinobu Inoue /* 46759dfcba4SHajimu UMEMOTO * Handle ECN by comparing this segment with the first one; 46859dfcba4SHajimu UMEMOTO * if CE is set, do not lose CE. 46959dfcba4SHajimu UMEMOTO * drop if CE and not-ECT are mixed for the same packet. 47059dfcba4SHajimu UMEMOTO */ 47159dfcba4SHajimu UMEMOTO ecn = (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 4725e9510e3SJINMEI Tatuya ecn0 = q6->ip6q_ecn; 47359dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_CE) { 47459dfcba4SHajimu UMEMOTO if (ecn0 == IPTOS_ECN_NOTECT) { 47559dfcba4SHajimu UMEMOTO free(ip6af, M_FTABLE); 47659dfcba4SHajimu UMEMOTO goto dropfrag; 47759dfcba4SHajimu UMEMOTO } 47859dfcba4SHajimu UMEMOTO if (ecn0 != IPTOS_ECN_CE) 4795e9510e3SJINMEI Tatuya q6->ip6q_ecn = IPTOS_ECN_CE; 48059dfcba4SHajimu UMEMOTO } 48159dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT) { 48259dfcba4SHajimu UMEMOTO free(ip6af, M_FTABLE); 48359dfcba4SHajimu UMEMOTO goto dropfrag; 48459dfcba4SHajimu UMEMOTO } 48559dfcba4SHajimu UMEMOTO 48659dfcba4SHajimu UMEMOTO /* 48782cd038dSYoshinobu Inoue * Find a segment which begins after this one does. 48882cd038dSYoshinobu Inoue */ 48982cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 49082cd038dSYoshinobu Inoue af6 = af6->ip6af_down) 49182cd038dSYoshinobu Inoue if (af6->ip6af_off > ip6af->ip6af_off) 49282cd038dSYoshinobu Inoue break; 49382cd038dSYoshinobu Inoue 494686cdd19SJun-ichiro itojun Hagino #if 0 495686cdd19SJun-ichiro itojun Hagino /* 496686cdd19SJun-ichiro itojun Hagino * If there is a preceding segment, it may provide some of 497686cdd19SJun-ichiro itojun Hagino * our data already. If so, drop the data from the incoming 498686cdd19SJun-ichiro itojun Hagino * segment. If it provides all of our data, drop us. 499686cdd19SJun-ichiro itojun Hagino */ 500686cdd19SJun-ichiro itojun Hagino if (af6->ip6af_up != (struct ip6asfrag *)q6) { 501686cdd19SJun-ichiro itojun Hagino i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 502686cdd19SJun-ichiro itojun Hagino - ip6af->ip6af_off; 503686cdd19SJun-ichiro itojun Hagino if (i > 0) { 504686cdd19SJun-ichiro itojun Hagino if (i >= ip6af->ip6af_frglen) 505686cdd19SJun-ichiro itojun Hagino goto dropfrag; 506686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(ip6af), i); 507686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off += i; 508686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_frglen -= i; 509686cdd19SJun-ichiro itojun Hagino } 510686cdd19SJun-ichiro itojun Hagino } 511686cdd19SJun-ichiro itojun Hagino 512686cdd19SJun-ichiro itojun Hagino /* 513686cdd19SJun-ichiro itojun Hagino * While we overlap succeeding segments trim them or, 514686cdd19SJun-ichiro itojun Hagino * if they are completely covered, dequeue them. 515686cdd19SJun-ichiro itojun Hagino */ 516686cdd19SJun-ichiro itojun Hagino while (af6 != (struct ip6asfrag *)q6 && 517686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off + ip6af->ip6af_frglen > af6->ip6af_off) { 518686cdd19SJun-ichiro itojun Hagino i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 519686cdd19SJun-ichiro itojun Hagino if (i < af6->ip6af_frglen) { 520686cdd19SJun-ichiro itojun Hagino af6->ip6af_frglen -= i; 521686cdd19SJun-ichiro itojun Hagino af6->ip6af_off += i; 522686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(af6), i); 523686cdd19SJun-ichiro itojun Hagino break; 524686cdd19SJun-ichiro itojun Hagino } 525686cdd19SJun-ichiro itojun Hagino af6 = af6->ip6af_down; 526686cdd19SJun-ichiro itojun Hagino m_freem(IP6_REASS_MBUF(af6->ip6af_up)); 52780d7a853SJonathan T. Looney frag6_deq(af6->ip6af_up, hash); 528686cdd19SJun-ichiro itojun Hagino } 529686cdd19SJun-ichiro itojun Hagino #else 53082cd038dSYoshinobu Inoue /* 53182cd038dSYoshinobu Inoue * If the incoming framgent overlaps some existing fragments in 53282cd038dSYoshinobu Inoue * the reassembly queue, drop it, since it is dangerous to override 53382cd038dSYoshinobu Inoue * existing fragments from a security point of view. 5349888c401SHajimu UMEMOTO * We don't know which fragment is the bad guy - here we trust 5359888c401SHajimu UMEMOTO * fragment that came in earlier, with no real reason. 5365e9510e3SJINMEI Tatuya * 5375e9510e3SJINMEI Tatuya * Note: due to changes after disabling this part, mbuf passed to 5385e9510e3SJINMEI Tatuya * m_adj() below now does not meet the requirement. 53982cd038dSYoshinobu Inoue */ 54082cd038dSYoshinobu Inoue if (af6->ip6af_up != (struct ip6asfrag *)q6) { 54182cd038dSYoshinobu Inoue i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 54282cd038dSYoshinobu Inoue - ip6af->ip6af_off; 54382cd038dSYoshinobu Inoue if (i > 0) { 5442bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 54582cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 54682cd038dSYoshinobu Inoue "overlaps the previous fragment\n", 5471d54aa3bSBjoern A. Zeeb i, ip6_sprintf(ip6buf, &q6->ip6q_src)); 5482bf76779SMunechika SUMIKAWA #endif 5492bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 55082cd038dSYoshinobu Inoue goto dropfrag; 55182cd038dSYoshinobu Inoue } 55282cd038dSYoshinobu Inoue } 55382cd038dSYoshinobu Inoue if (af6 != (struct ip6asfrag *)q6) { 55482cd038dSYoshinobu Inoue i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 55582cd038dSYoshinobu Inoue if (i > 0) { 5562bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 55782cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 55882cd038dSYoshinobu Inoue "overlaps the succeeding fragment", 5591d54aa3bSBjoern A. Zeeb i, ip6_sprintf(ip6buf, &q6->ip6q_src)); 5602bf76779SMunechika SUMIKAWA #endif 5612bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 56282cd038dSYoshinobu Inoue goto dropfrag; 56382cd038dSYoshinobu Inoue } 56482cd038dSYoshinobu Inoue } 565686cdd19SJun-ichiro itojun Hagino #endif 56682cd038dSYoshinobu Inoue 56782cd038dSYoshinobu Inoue insert: 5684b908c8bSRobert Watson #ifdef MAC 5694b908c8bSRobert Watson if (!first_frag) 5704b908c8bSRobert Watson mac_ip6q_update(m, q6); 5714b908c8bSRobert Watson #endif 57282cd038dSYoshinobu Inoue 57382cd038dSYoshinobu Inoue /* 57482cd038dSYoshinobu Inoue * Stick new segment in its place; 57582cd038dSYoshinobu Inoue * check for complete reassembly. 57603c99d76SJonathan T. Looney * If not complete, check fragment limit. 57782cd038dSYoshinobu Inoue * Move to front of packet queue, as we are 57882cd038dSYoshinobu Inoue * the most recently active fragmented packet. 57982cd038dSYoshinobu Inoue */ 58080d7a853SJonathan T. Looney frag6_enq(ip6af, af6->ip6af_up, hash); 5812adfd64fSJonathan T. Looney atomic_add_int(&frag6_nfrags, 1); 5829888c401SHajimu UMEMOTO q6->ip6q_nfrag++; 583686cdd19SJun-ichiro itojun Hagino #if 0 /* xxx */ 58480d7a853SJonathan T. Looney if (q6 != head->ip6q_next) { 58580d7a853SJonathan T. Looney frag6_remque(q6, hash); 58680d7a853SJonathan T. Looney frag6_insque_head(q6, head, hash); 587686cdd19SJun-ichiro itojun Hagino } 588686cdd19SJun-ichiro itojun Hagino #endif 58982cd038dSYoshinobu Inoue next = 0; 59082cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 59182cd038dSYoshinobu Inoue af6 = af6->ip6af_down) { 59282cd038dSYoshinobu Inoue if (af6->ip6af_off != next) { 59303c99d76SJonathan T. Looney if (q6->ip6q_nfrag > V_ip6_maxfragsperpacket) { 59403c99d76SJonathan T. Looney IP6STAT_INC(ip6s_fragdropped); 59503c99d76SJonathan T. Looney frag6_freef(q6, hash); 59603c99d76SJonathan T. Looney } 59780d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 59882cd038dSYoshinobu Inoue return IPPROTO_DONE; 59982cd038dSYoshinobu Inoue } 60082cd038dSYoshinobu Inoue next += af6->ip6af_frglen; 60182cd038dSYoshinobu Inoue } 60282cd038dSYoshinobu Inoue if (af6->ip6af_up->ip6af_mff) { 60303c99d76SJonathan T. Looney if (q6->ip6q_nfrag > V_ip6_maxfragsperpacket) { 60403c99d76SJonathan T. Looney IP6STAT_INC(ip6s_fragdropped); 60503c99d76SJonathan T. Looney frag6_freef(q6, hash); 60603c99d76SJonathan T. Looney } 60780d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 60882cd038dSYoshinobu Inoue return IPPROTO_DONE; 60982cd038dSYoshinobu Inoue } 61082cd038dSYoshinobu Inoue 61182cd038dSYoshinobu Inoue /* 61282cd038dSYoshinobu Inoue * Reassembly is complete; concatenate fragments. 61382cd038dSYoshinobu Inoue */ 61482cd038dSYoshinobu Inoue ip6af = q6->ip6q_down; 61582cd038dSYoshinobu Inoue t = m = IP6_REASS_MBUF(ip6af); 61682cd038dSYoshinobu Inoue af6 = ip6af->ip6af_down; 61780d7a853SJonathan T. Looney frag6_deq(ip6af, hash); 61882cd038dSYoshinobu Inoue while (af6 != (struct ip6asfrag *)q6) { 6199907aba3SAndrey V. Elsukov m->m_pkthdr.csum_flags &= 6209907aba3SAndrey V. Elsukov IP6_REASS_MBUF(af6)->m_pkthdr.csum_flags; 6219907aba3SAndrey V. Elsukov m->m_pkthdr.csum_data += 6229907aba3SAndrey V. Elsukov IP6_REASS_MBUF(af6)->m_pkthdr.csum_data; 6239907aba3SAndrey V. Elsukov 624686cdd19SJun-ichiro itojun Hagino af6dwn = af6->ip6af_down; 62580d7a853SJonathan T. Looney frag6_deq(af6, hash); 62682cd038dSYoshinobu Inoue while (t->m_next) 62782cd038dSYoshinobu Inoue t = t->m_next; 628ba99cc0bSAlexander V. Chernikov m_adj(IP6_REASS_MBUF(af6), af6->ip6af_offset); 62909b0b8c0SNavdeep Parhar m_demote_pkthdr(IP6_REASS_MBUF(af6)); 630ba99cc0bSAlexander V. Chernikov m_cat(t, IP6_REASS_MBUF(af6)); 631686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 632686cdd19SJun-ichiro itojun Hagino af6 = af6dwn; 63382cd038dSYoshinobu Inoue } 63482cd038dSYoshinobu Inoue 6359907aba3SAndrey V. Elsukov while (m->m_pkthdr.csum_data & 0xffff0000) 6369907aba3SAndrey V. Elsukov m->m_pkthdr.csum_data = (m->m_pkthdr.csum_data & 0xffff) + 6379907aba3SAndrey V. Elsukov (m->m_pkthdr.csum_data >> 16); 6389907aba3SAndrey V. Elsukov 63982cd038dSYoshinobu Inoue /* adjust offset to point where the original next header starts */ 64082cd038dSYoshinobu Inoue offset = ip6af->ip6af_offset - sizeof(struct ip6_frag); 641686cdd19SJun-ichiro itojun Hagino free(ip6af, M_FTABLE); 642686cdd19SJun-ichiro itojun Hagino ip6 = mtod(m, struct ip6_hdr *); 64382cd038dSYoshinobu Inoue ip6->ip6_plen = htons((u_short)next + offset - sizeof(struct ip6_hdr)); 6445e9510e3SJINMEI Tatuya if (q6->ip6q_ecn == IPTOS_ECN_CE) 6455e9510e3SJINMEI Tatuya ip6->ip6_flow |= htonl(IPTOS_ECN_CE << 20); 64682cd038dSYoshinobu Inoue nxt = q6->ip6q_nxt; 647686cdd19SJun-ichiro itojun Hagino #ifdef notyet 648686cdd19SJun-ichiro itojun Hagino *q6->ip6q_nxtp = (u_char)(nxt & 0xff); 649686cdd19SJun-ichiro itojun Hagino #endif 65082cd038dSYoshinobu Inoue 6510b438b0fSGleb Smirnoff if (ip6_deletefraghdr(m, offset, M_NOWAIT) != 0) { 65280d7a853SJonathan T. Looney frag6_remque(q6, hash); 6532adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 6544b908c8bSRobert Watson #ifdef MAC 6554b908c8bSRobert Watson mac_ip6q_destroy(q6); 6564b908c8bSRobert Watson #endif 657686cdd19SJun-ichiro itojun Hagino free(q6, M_FTABLE); 65880d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 6590b438b0fSGleb Smirnoff 660686cdd19SJun-ichiro itojun Hagino goto dropfrag; 66182cd038dSYoshinobu Inoue } 66282cd038dSYoshinobu Inoue 66382cd038dSYoshinobu Inoue /* 66482cd038dSYoshinobu Inoue * Store NXT to the original. 66582cd038dSYoshinobu Inoue */ 66668e0e5a6SAndrey V. Elsukov m_copyback(m, ip6_get_prevhdr(m, offset), sizeof(uint8_t), 66768e0e5a6SAndrey V. Elsukov (caddr_t)&nxt); 66882cd038dSYoshinobu Inoue 66980d7a853SJonathan T. Looney frag6_remque(q6, hash); 6702adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 6714b908c8bSRobert Watson #ifdef MAC 6724b908c8bSRobert Watson mac_ip6q_reassemble(q6, m); 6734b908c8bSRobert Watson mac_ip6q_destroy(q6); 6744b908c8bSRobert Watson #endif 67582cd038dSYoshinobu Inoue free(q6, M_FTABLE); 67680d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 67782cd038dSYoshinobu Inoue 67882cd038dSYoshinobu Inoue if (m->m_flags & M_PKTHDR) { /* Isn't it always true? */ 67982cd038dSYoshinobu Inoue int plen = 0; 68082cd038dSYoshinobu Inoue for (t = m; t; t = t->m_next) 68182cd038dSYoshinobu Inoue plen += t->m_len; 68282cd038dSYoshinobu Inoue m->m_pkthdr.len = plen; 68382cd038dSYoshinobu Inoue } 68482cd038dSYoshinobu Inoue 685aaa46574SAdrian Chadd #ifdef RSS 686aaa46574SAdrian Chadd mtag = m_tag_alloc(MTAG_ABI_IPV6, IPV6_TAG_DIRECT, sizeof(*ip6dc), 687aaa46574SAdrian Chadd M_NOWAIT); 688aaa46574SAdrian Chadd if (mtag == NULL) 689aaa46574SAdrian Chadd goto dropfrag; 690aaa46574SAdrian Chadd 691aaa46574SAdrian Chadd ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 692aaa46574SAdrian Chadd ip6dc->ip6dc_nxt = nxt; 693aaa46574SAdrian Chadd ip6dc->ip6dc_off = offset; 694aaa46574SAdrian Chadd 695aaa46574SAdrian Chadd m_tag_prepend(m, mtag); 696aaa46574SAdrian Chadd #endif 697aaa46574SAdrian Chadd 69880d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 6999cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_reassembled); 70082cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_ok); 70182cd038dSYoshinobu Inoue 702aaa46574SAdrian Chadd #ifdef RSS 703aaa46574SAdrian Chadd /* 704aaa46574SAdrian Chadd * Queue/dispatch for reprocessing. 705aaa46574SAdrian Chadd */ 706aaa46574SAdrian Chadd netisr_dispatch(NETISR_IPV6_DIRECT, m); 707aaa46574SAdrian Chadd return IPPROTO_DONE; 708aaa46574SAdrian Chadd #endif 709aaa46574SAdrian Chadd 71082cd038dSYoshinobu Inoue /* 71182cd038dSYoshinobu Inoue * Tell launch routine the next header 71282cd038dSYoshinobu Inoue */ 71382cd038dSYoshinobu Inoue 71482cd038dSYoshinobu Inoue *mp = m; 71582cd038dSYoshinobu Inoue *offp = offset; 71682cd038dSYoshinobu Inoue 71782cd038dSYoshinobu Inoue return nxt; 71882cd038dSYoshinobu Inoue 71982cd038dSYoshinobu Inoue dropfrag: 72080d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 72182cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 7229cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 72382cd038dSYoshinobu Inoue m_freem(m); 72482cd038dSYoshinobu Inoue return IPPROTO_DONE; 72582cd038dSYoshinobu Inoue } 72682cd038dSYoshinobu Inoue 72782cd038dSYoshinobu Inoue /* 72882cd038dSYoshinobu Inoue * Free a fragment reassembly header and all 72982cd038dSYoshinobu Inoue * associated datagrams. 73082cd038dSYoshinobu Inoue */ 73180d7a853SJonathan T. Looney static void 73280d7a853SJonathan T. Looney frag6_freef(struct ip6q *q6, uint32_t bucket) 73382cd038dSYoshinobu Inoue { 73482cd038dSYoshinobu Inoue struct ip6asfrag *af6, *down6; 73582cd038dSYoshinobu Inoue 73680d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 7379888c401SHajimu UMEMOTO 73882cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 73982cd038dSYoshinobu Inoue af6 = down6) { 74082cd038dSYoshinobu Inoue struct mbuf *m = IP6_REASS_MBUF(af6); 74182cd038dSYoshinobu Inoue 74282cd038dSYoshinobu Inoue down6 = af6->ip6af_down; 74380d7a853SJonathan T. Looney frag6_deq(af6, bucket); 74482cd038dSYoshinobu Inoue 74582cd038dSYoshinobu Inoue /* 74682cd038dSYoshinobu Inoue * Return ICMP time exceeded error for the 1st fragment. 74782cd038dSYoshinobu Inoue * Just free other fragments. 74882cd038dSYoshinobu Inoue */ 74982cd038dSYoshinobu Inoue if (af6->ip6af_off == 0) { 75082cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 75182cd038dSYoshinobu Inoue 75282cd038dSYoshinobu Inoue /* adjust pointer */ 75382cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 75482cd038dSYoshinobu Inoue 75506cd0a3fSHajimu UMEMOTO /* restore source and destination addresses */ 75682cd038dSYoshinobu Inoue ip6->ip6_src = q6->ip6q_src; 75782cd038dSYoshinobu Inoue ip6->ip6_dst = q6->ip6q_dst; 75882cd038dSYoshinobu Inoue 75982cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_TIME_EXCEEDED, 76082cd038dSYoshinobu Inoue ICMP6_TIME_EXCEED_REASSEMBLY, 0); 761686cdd19SJun-ichiro itojun Hagino } else 76282cd038dSYoshinobu Inoue m_freem(m); 763686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 76482cd038dSYoshinobu Inoue } 76580d7a853SJonathan T. Looney frag6_remque(q6, bucket); 7662adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 7674b908c8bSRobert Watson #ifdef MAC 7684b908c8bSRobert Watson mac_ip6q_destroy(q6); 7694b908c8bSRobert Watson #endif 77082cd038dSYoshinobu Inoue free(q6, M_FTABLE); 77180d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 77282cd038dSYoshinobu Inoue } 77382cd038dSYoshinobu Inoue 77482cd038dSYoshinobu Inoue /* 77582cd038dSYoshinobu Inoue * Put an ip fragment on a reassembly chain. 77682cd038dSYoshinobu Inoue * Like insque, but pointers in middle of structure. 77782cd038dSYoshinobu Inoue */ 77880d7a853SJonathan T. Looney static void 77980d7a853SJonathan T. Looney frag6_enq(struct ip6asfrag *af6, struct ip6asfrag *up6, 78080d7a853SJonathan T. Looney uint32_t bucket __unused) 78182cd038dSYoshinobu Inoue { 7829888c401SHajimu UMEMOTO 78380d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 7849888c401SHajimu UMEMOTO 78582cd038dSYoshinobu Inoue af6->ip6af_up = up6; 78682cd038dSYoshinobu Inoue af6->ip6af_down = up6->ip6af_down; 78782cd038dSYoshinobu Inoue up6->ip6af_down->ip6af_up = af6; 78882cd038dSYoshinobu Inoue up6->ip6af_down = af6; 78982cd038dSYoshinobu Inoue } 79082cd038dSYoshinobu Inoue 79182cd038dSYoshinobu Inoue /* 79282cd038dSYoshinobu Inoue * To frag6_enq as remque is to insque. 79382cd038dSYoshinobu Inoue */ 79480d7a853SJonathan T. Looney static void 79580d7a853SJonathan T. Looney frag6_deq(struct ip6asfrag *af6, uint32_t bucket __unused) 79682cd038dSYoshinobu Inoue { 7979888c401SHajimu UMEMOTO 79880d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 7999888c401SHajimu UMEMOTO 80082cd038dSYoshinobu Inoue af6->ip6af_up->ip6af_down = af6->ip6af_down; 80182cd038dSYoshinobu Inoue af6->ip6af_down->ip6af_up = af6->ip6af_up; 80282cd038dSYoshinobu Inoue } 80382cd038dSYoshinobu Inoue 80480d7a853SJonathan T. Looney static void 8051e9f3b73SJonathan T. Looney frag6_insque_head(struct ip6q *new, struct ip6q *old, uint32_t bucket) 80682cd038dSYoshinobu Inoue { 8079888c401SHajimu UMEMOTO 80880d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 80980d7a853SJonathan T. Looney KASSERT(IP6Q_HEAD(bucket) == old, 81080d7a853SJonathan T. Looney ("%s: attempt to insert at head of wrong bucket" 81180d7a853SJonathan T. Looney " (bucket=%u, old=%p)", __func__, bucket, old)); 8129888c401SHajimu UMEMOTO 81382cd038dSYoshinobu Inoue new->ip6q_prev = old; 81482cd038dSYoshinobu Inoue new->ip6q_next = old->ip6q_next; 81582cd038dSYoshinobu Inoue old->ip6q_next->ip6q_prev= new; 81682cd038dSYoshinobu Inoue old->ip6q_next = new; 8171e9f3b73SJonathan T. Looney V_ip6q[bucket].count++; 81882cd038dSYoshinobu Inoue } 81982cd038dSYoshinobu Inoue 82080d7a853SJonathan T. Looney static void 8211e9f3b73SJonathan T. Looney frag6_remque(struct ip6q *p6, uint32_t bucket) 82282cd038dSYoshinobu Inoue { 8239888c401SHajimu UMEMOTO 82480d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 8259888c401SHajimu UMEMOTO 82682cd038dSYoshinobu Inoue p6->ip6q_prev->ip6q_next = p6->ip6q_next; 82782cd038dSYoshinobu Inoue p6->ip6q_next->ip6q_prev = p6->ip6q_prev; 8281e9f3b73SJonathan T. Looney V_ip6q[bucket].count--; 82982cd038dSYoshinobu Inoue } 83082cd038dSYoshinobu Inoue 83182cd038dSYoshinobu Inoue /* 83233841545SHajimu UMEMOTO * IPv6 reassembling timer processing; 83382cd038dSYoshinobu Inoue * if a timer expires on a reassembly 83482cd038dSYoshinobu Inoue * queue, discard it. 83582cd038dSYoshinobu Inoue */ 83682cd038dSYoshinobu Inoue void 8371272577eSXin LI frag6_slowtimo(void) 83882cd038dSYoshinobu Inoue { 8398b615593SMarko Zec VNET_ITERATOR_DECL(vnet_iter); 84080d7a853SJonathan T. Looney struct ip6q *head, *q6; 84180d7a853SJonathan T. Looney int i; 84282cd038dSYoshinobu Inoue 8435ee847d3SRobert Watson VNET_LIST_RLOCK_NOSLEEP(); 8448b615593SMarko Zec VNET_FOREACH(vnet_iter) { 8458b615593SMarko Zec CURVNET_SET(vnet_iter); 84680d7a853SJonathan T. Looney for (i = 0; i < IP6REASS_NHASH; i++) { 84780d7a853SJonathan T. Looney IP6Q_LOCK(i); 84880d7a853SJonathan T. Looney head = IP6Q_HEAD(i); 84980d7a853SJonathan T. Looney q6 = head->ip6q_next; 8501e9f3b73SJonathan T. Looney if (q6 == NULL) { 8511e9f3b73SJonathan T. Looney /* 8521e9f3b73SJonathan T. Looney * XXXJTL: This should never happen. This 8531e9f3b73SJonathan T. Looney * should turn into an assertion. 8541e9f3b73SJonathan T. Looney */ 8551e9f3b73SJonathan T. Looney IP6Q_UNLOCK(i); 8561e9f3b73SJonathan T. Looney continue; 8571e9f3b73SJonathan T. Looney } 85880d7a853SJonathan T. Looney while (q6 != head) { 85982cd038dSYoshinobu Inoue --q6->ip6q_ttl; 86082cd038dSYoshinobu Inoue q6 = q6->ip6q_next; 86182cd038dSYoshinobu Inoue if (q6->ip6q_prev->ip6q_ttl == 0) { 8629cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragtimeout); 86382cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 86480d7a853SJonathan T. Looney frag6_freef(q6->ip6q_prev, i); 86582cd038dSYoshinobu Inoue } 86682cd038dSYoshinobu Inoue } 86782cd038dSYoshinobu Inoue /* 86882cd038dSYoshinobu Inoue * If we are over the maximum number of fragments 86982cd038dSYoshinobu Inoue * (due to the limit being lowered), drain off 87082cd038dSYoshinobu Inoue * enough to get down to the new limit. 8711e9f3b73SJonathan T. Looney * Note that we drain all reassembly queues if 8721e9f3b73SJonathan T. Looney * maxfragpackets is 0 (fragmentation is disabled), 8731e9f3b73SJonathan T. Looney * and don't enforce a limit when maxfragpackets 8741e9f3b73SJonathan T. Looney * is negative. 87582cd038dSYoshinobu Inoue */ 8761e9f3b73SJonathan T. Looney while ((V_ip6_maxfragpackets == 0 || 8771e9f3b73SJonathan T. Looney (V_ip6_maxfragpackets > 0 && 8781e9f3b73SJonathan T. Looney V_ip6q[i].count > V_ip6_maxfragbucketsize)) && 87980d7a853SJonathan T. Looney head->ip6q_prev != head) { 8809cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragoverflow); 88182cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 88280d7a853SJonathan T. Looney frag6_freef(head->ip6q_prev, i); 88380d7a853SJonathan T. Looney } 88480d7a853SJonathan T. Looney IP6Q_UNLOCK(i); 88582cd038dSYoshinobu Inoue } 8861e9f3b73SJonathan T. Looney /* 8871e9f3b73SJonathan T. Looney * If we are still over the maximum number of fragmented 8881e9f3b73SJonathan T. Looney * packets, drain off enough to get down to the new limit. 8891e9f3b73SJonathan T. Looney */ 8901e9f3b73SJonathan T. Looney i = 0; 8911e9f3b73SJonathan T. Looney while (V_ip6_maxfragpackets >= 0 && 8921e9f3b73SJonathan T. Looney atomic_load_int(&V_frag6_nfragpackets) > 8931e9f3b73SJonathan T. Looney (u_int)V_ip6_maxfragpackets) { 8941e9f3b73SJonathan T. Looney IP6Q_LOCK(i); 8951e9f3b73SJonathan T. Looney head = IP6Q_HEAD(i); 8961e9f3b73SJonathan T. Looney if (head->ip6q_prev != head) { 8971e9f3b73SJonathan T. Looney IP6STAT_INC(ip6s_fragoverflow); 8981e9f3b73SJonathan T. Looney /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 8991e9f3b73SJonathan T. Looney frag6_freef(head->ip6q_prev, i); 9001e9f3b73SJonathan T. Looney } 9011e9f3b73SJonathan T. Looney IP6Q_UNLOCK(i); 9021e9f3b73SJonathan T. Looney i = (i + 1) % IP6REASS_NHASH; 9031e9f3b73SJonathan T. Looney } 9048b615593SMarko Zec CURVNET_RESTORE(); 9058b615593SMarko Zec } 9065ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 90782cd038dSYoshinobu Inoue } 90882cd038dSYoshinobu Inoue 90982cd038dSYoshinobu Inoue /* 91082cd038dSYoshinobu Inoue * Drain off all datagram fragments. 91182cd038dSYoshinobu Inoue */ 91282cd038dSYoshinobu Inoue void 9131272577eSXin LI frag6_drain(void) 91482cd038dSYoshinobu Inoue { 9158b615593SMarko Zec VNET_ITERATOR_DECL(vnet_iter); 91680d7a853SJonathan T. Looney struct ip6q *head; 91780d7a853SJonathan T. Looney int i; 9189888c401SHajimu UMEMOTO 9195ee847d3SRobert Watson VNET_LIST_RLOCK_NOSLEEP(); 9208b615593SMarko Zec VNET_FOREACH(vnet_iter) { 9218b615593SMarko Zec CURVNET_SET(vnet_iter); 92280d7a853SJonathan T. Looney for (i = 0; i < IP6REASS_NHASH; i++) { 92380d7a853SJonathan T. Looney if (IP6Q_TRYLOCK(i) == 0) 92480d7a853SJonathan T. Looney continue; 92580d7a853SJonathan T. Looney head = IP6Q_HEAD(i); 92680d7a853SJonathan T. Looney while (head->ip6q_next != head) { 9279cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 92882cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 92980d7a853SJonathan T. Looney frag6_freef(head->ip6q_next, i); 93080d7a853SJonathan T. Looney } 93180d7a853SJonathan T. Looney IP6Q_UNLOCK(i); 93282cd038dSYoshinobu Inoue } 9338b615593SMarko Zec CURVNET_RESTORE(); 9348b615593SMarko Zec } 9355ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 93682cd038dSYoshinobu Inoue } 937e5ee7060SGleb Smirnoff 938e5ee7060SGleb Smirnoff int 939e5ee7060SGleb Smirnoff ip6_deletefraghdr(struct mbuf *m, int offset, int wait) 940e5ee7060SGleb Smirnoff { 941e5ee7060SGleb Smirnoff struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 942e5ee7060SGleb Smirnoff struct mbuf *t; 943e5ee7060SGleb Smirnoff 944e5ee7060SGleb Smirnoff /* Delete frag6 header. */ 945e5ee7060SGleb Smirnoff if (m->m_len >= offset + sizeof(struct ip6_frag)) { 946e5ee7060SGleb Smirnoff /* This is the only possible case with !PULLDOWN_TEST. */ 947e5ee7060SGleb Smirnoff bcopy(ip6, (char *)ip6 + sizeof(struct ip6_frag), 948e5ee7060SGleb Smirnoff offset); 949e5ee7060SGleb Smirnoff m->m_data += sizeof(struct ip6_frag); 950e5ee7060SGleb Smirnoff m->m_len -= sizeof(struct ip6_frag); 951e5ee7060SGleb Smirnoff } else { 952e5ee7060SGleb Smirnoff /* This comes with no copy if the boundary is on cluster. */ 953e5ee7060SGleb Smirnoff if ((t = m_split(m, offset, wait)) == NULL) 954e5ee7060SGleb Smirnoff return (ENOMEM); 955e5ee7060SGleb Smirnoff m_adj(t, sizeof(struct ip6_frag)); 956e5ee7060SGleb Smirnoff m_cat(m, t); 957e5ee7060SGleb Smirnoff } 958e5ee7060SGleb Smirnoff 959a4061289SAndrey V. Elsukov m->m_flags |= M_FRAGMENTED; 960e5ee7060SGleb Smirnoff return (0); 961e5ee7060SGleb Smirnoff } 962