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 */ 7480d7a853SJonathan T. Looney #define IP6REASS_NHASH_LOG2 6 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 *, 8280d7a853SJonathan T. Looney uint32_t bucket __unused); 8380d7a853SJonathan T. Looney static void frag6_remque(struct ip6q *, uint32_t bucket __unused); 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; 8980d7a853SJonathan T. Looney }; 9080d7a853SJonathan T. Looney 9180d7a853SJonathan T. Looney VNET_DEFINE_STATIC(volatile u_int, frag6_nfragpackets); 922adfd64fSJonathan T. Looney volatile u_int frag6_nfrags = 0; 9380d7a853SJonathan T. Looney VNET_DEFINE_STATIC(struct ip6qbucket, ip6q[IP6REASS_NHASH]); 9480d7a853SJonathan T. Looney VNET_DEFINE_STATIC(uint32_t, ip6q_hashseed); 95eddfbb76SRobert Watson 961e77c105SRobert Watson #define V_frag6_nfragpackets VNET(frag6_nfragpackets) 971e77c105SRobert Watson #define V_ip6q VNET(ip6q) 9880d7a853SJonathan T. Looney #define V_ip6q_hashseed VNET(ip6q_hashseed) 9982cd038dSYoshinobu Inoue 10080d7a853SJonathan T. Looney #define IP6Q_LOCK(i) mtx_lock(&V_ip6q[(i)].lock) 10180d7a853SJonathan T. Looney #define IP6Q_TRYLOCK(i) mtx_trylock(&V_ip6q[(i)].lock) 10280d7a853SJonathan T. Looney #define IP6Q_LOCK_ASSERT(i) mtx_assert(&V_ip6q[(i)].lock, MA_OWNED) 10380d7a853SJonathan T. Looney #define IP6Q_UNLOCK(i) mtx_unlock(&V_ip6q[(i)].lock) 10480d7a853SJonathan T. Looney #define IP6Q_HEAD(i) (&V_ip6q[(i)].ip6q) 1059888c401SHajimu UMEMOTO 106959b7375SPoul-Henning Kamp static MALLOC_DEFINE(M_FTABLE, "fragment", "fragment reassembly header"); 107686cdd19SJun-ichiro itojun Hagino 10882cd038dSYoshinobu Inoue /* 10982cd038dSYoshinobu Inoue * Initialise reassembly queue and fragment identifier. 11082cd038dSYoshinobu Inoue */ 1114f590175SPaul Saab static void 1124f590175SPaul Saab frag6_change(void *tag) 1134f590175SPaul Saab { 1142adfd64fSJonathan T. Looney VNET_ITERATOR_DECL(vnet_iter); 1154f590175SPaul Saab 1162adfd64fSJonathan T. Looney ip6_maxfrags = nmbclusters / 4; 1172adfd64fSJonathan T. Looney VNET_LIST_RLOCK_NOSLEEP(); 1182adfd64fSJonathan T. Looney VNET_FOREACH(vnet_iter) { 1192adfd64fSJonathan T. Looney CURVNET_SET(vnet_iter); 120603724d3SBjoern A. Zeeb V_ip6_maxfragpackets = nmbclusters / 4; 1212adfd64fSJonathan T. Looney CURVNET_RESTORE(); 1222adfd64fSJonathan T. Looney } 1232adfd64fSJonathan T. Looney VNET_LIST_RUNLOCK_NOSLEEP(); 1244f590175SPaul Saab } 1254f590175SPaul Saab 12682cd038dSYoshinobu Inoue void 1271272577eSXin LI frag6_init(void) 12882cd038dSYoshinobu Inoue { 12980d7a853SJonathan T. Looney struct ip6q *q6; 13080d7a853SJonathan T. Looney int i; 13182cd038dSYoshinobu Inoue 132603724d3SBjoern A. Zeeb V_ip6_maxfragpackets = nmbclusters / 4; 13380d7a853SJonathan T. Looney for (i = 0; i < IP6REASS_NHASH; i++) { 13480d7a853SJonathan T. Looney q6 = IP6Q_HEAD(i); 13580d7a853SJonathan T. Looney q6->ip6q_next = q6->ip6q_prev = q6; 13680d7a853SJonathan T. Looney mtx_init(&V_ip6q[i].lock, "ip6qlock", NULL, MTX_DEF); 13780d7a853SJonathan T. Looney } 13880d7a853SJonathan T. Looney V_ip6q_hashseed = arc4random(); 13903c99d76SJonathan T. Looney V_ip6_maxfragsperpacket = 64; 1401ed81b73SMarko Zec if (!IS_DEFAULT_VNET(curvnet)) 1411ed81b73SMarko Zec return; 14296c2b042SJesper Skriver 1432adfd64fSJonathan T. Looney ip6_maxfrags = nmbclusters / 4; 1441ed81b73SMarko Zec EVENTHANDLER_REGISTER(nmbclusters_change, 1451ed81b73SMarko Zec frag6_change, NULL, EVENTHANDLER_PRI_ANY); 14682cd038dSYoshinobu Inoue } 14782cd038dSYoshinobu Inoue 14882cd038dSYoshinobu Inoue /* 149686cdd19SJun-ichiro itojun Hagino * In RFC2460, fragment and reassembly rule do not agree with each other, 150686cdd19SJun-ichiro itojun Hagino * in terms of next header field handling in fragment header. 151686cdd19SJun-ichiro itojun Hagino * While the sender will use the same value for all of the fragmented packets, 152686cdd19SJun-ichiro itojun Hagino * receiver is suggested not to check the consistency. 153686cdd19SJun-ichiro itojun Hagino * 154686cdd19SJun-ichiro itojun Hagino * fragment rule (p20): 155686cdd19SJun-ichiro itojun Hagino * (2) A Fragment header containing: 156686cdd19SJun-ichiro itojun Hagino * The Next Header value that identifies the first header of 157686cdd19SJun-ichiro itojun Hagino * the Fragmentable Part of the original packet. 158686cdd19SJun-ichiro itojun Hagino * -> next header field is same for all fragments 159686cdd19SJun-ichiro itojun Hagino * 160686cdd19SJun-ichiro itojun Hagino * reassembly rule (p21): 161686cdd19SJun-ichiro itojun Hagino * The Next Header field of the last header of the Unfragmentable 162686cdd19SJun-ichiro itojun Hagino * Part is obtained from the Next Header field of the first 163686cdd19SJun-ichiro itojun Hagino * fragment's Fragment header. 164686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 165686cdd19SJun-ichiro itojun Hagino * 166686cdd19SJun-ichiro itojun Hagino * The following note also contradicts with fragment rule - no one is going to 167686cdd19SJun-ichiro itojun Hagino * send different fragment with different next header field. 168686cdd19SJun-ichiro itojun Hagino * 169686cdd19SJun-ichiro itojun Hagino * additional note (p22): 170686cdd19SJun-ichiro itojun Hagino * The Next Header values in the Fragment headers of different 171686cdd19SJun-ichiro itojun Hagino * fragments of the same original packet may differ. Only the value 172686cdd19SJun-ichiro itojun Hagino * from the Offset zero fragment packet is used for reassembly. 173686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 174686cdd19SJun-ichiro itojun Hagino * 175686cdd19SJun-ichiro itojun Hagino * There is no explicit reason given in the RFC. Historical reason maybe? 176686cdd19SJun-ichiro itojun Hagino */ 177686cdd19SJun-ichiro itojun Hagino /* 17882cd038dSYoshinobu Inoue * Fragment input 17982cd038dSYoshinobu Inoue */ 18082cd038dSYoshinobu Inoue int 1811272577eSXin LI frag6_input(struct mbuf **mp, int *offp, int proto) 18282cd038dSYoshinobu Inoue { 18382cd038dSYoshinobu Inoue struct mbuf *m = *mp, *t; 18482cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 18582cd038dSYoshinobu Inoue struct ip6_frag *ip6f; 18680d7a853SJonathan T. Looney struct ip6q *head, *q6; 187686cdd19SJun-ichiro itojun Hagino struct ip6asfrag *af6, *ip6af, *af6dwn; 1882a5aafceSHajimu UMEMOTO struct in6_ifaddr *ia; 18982cd038dSYoshinobu Inoue int offset = *offp, nxt, i, next; 19082cd038dSYoshinobu Inoue int first_frag = 0; 191686cdd19SJun-ichiro itojun Hagino int fragoff, frgpartlen; /* must be larger than u_int16_t */ 19280d7a853SJonathan T. Looney uint32_t hash, hashkey[sizeof(struct in6_addr) * 2 + 1], *hashkeyp; 19382cd038dSYoshinobu Inoue struct ifnet *dstifp; 19459dfcba4SHajimu UMEMOTO u_int8_t ecn, ecn0; 195aaa46574SAdrian Chadd #ifdef RSS 196aaa46574SAdrian Chadd struct m_tag *mtag; 197aaa46574SAdrian Chadd struct ip6_direct_ctx *ip6dc; 198aaa46574SAdrian Chadd #endif 199aaa46574SAdrian Chadd 2001d54aa3bSBjoern A. Zeeb #if 0 2011d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 2021d54aa3bSBjoern A. Zeeb #endif 20382cd038dSYoshinobu Inoue 20482cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 205686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 206686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), IPPROTO_DONE); 20782cd038dSYoshinobu Inoue ip6f = (struct ip6_frag *)((caddr_t)ip6 + offset); 208686cdd19SJun-ichiro itojun Hagino #else 209686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(ip6f, struct ip6_frag *, m, offset, sizeof(*ip6f)); 210686cdd19SJun-ichiro itojun Hagino if (ip6f == NULL) 21140e39bbbSHajimu UMEMOTO return (IPPROTO_DONE); 212686cdd19SJun-ichiro itojun Hagino #endif 21382cd038dSYoshinobu Inoue 21482cd038dSYoshinobu Inoue dstifp = NULL; 21582cd038dSYoshinobu Inoue /* find the destination interface of the packet. */ 2163e88eb90SAndrey V. Elsukov ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 2173e88eb90SAndrey V. Elsukov if (ia != NULL) { 2182a5aafceSHajimu UMEMOTO dstifp = ia->ia_ifp; 2198c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 2208c0fec80SRobert Watson } 22182cd038dSYoshinobu Inoue /* jumbo payload can't contain a fragment header */ 22282cd038dSYoshinobu Inoue if (ip6->ip6_plen == 0) { 22382cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, offset); 22482cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 22582cd038dSYoshinobu Inoue return IPPROTO_DONE; 22682cd038dSYoshinobu Inoue } 22782cd038dSYoshinobu Inoue 22882cd038dSYoshinobu Inoue /* 22982cd038dSYoshinobu Inoue * check whether fragment packet's fragment length is 23082cd038dSYoshinobu Inoue * multiple of 8 octets. 23182cd038dSYoshinobu Inoue * sizeof(struct ip6_frag) == 8 23282cd038dSYoshinobu Inoue * sizeof(struct ip6_hdr) = 40 23382cd038dSYoshinobu Inoue */ 23482cd038dSYoshinobu Inoue if ((ip6f->ip6f_offlg & IP6F_MORE_FRAG) && 23582cd038dSYoshinobu Inoue (((ntohs(ip6->ip6_plen) - offset) & 0x7) != 0)) { 23606cd0a3fSHajimu UMEMOTO icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 237686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_hdr, ip6_plen)); 23882cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 23982cd038dSYoshinobu Inoue return IPPROTO_DONE; 24082cd038dSYoshinobu Inoue } 24182cd038dSYoshinobu Inoue 2429cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragments); 24382cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_reqd); 24482cd038dSYoshinobu Inoue 245686cdd19SJun-ichiro itojun Hagino /* offset now points to data portion */ 24682cd038dSYoshinobu Inoue offset += sizeof(struct ip6_frag); 24782cd038dSYoshinobu Inoue 2484018ea9aSBjoern A. Zeeb /* 249fd291ae3SBjoern A. Zeeb * RFC 6946: Handle "atomic" fragments (offset and m bit set to 0) 250fd291ae3SBjoern A. Zeeb * upfront, unrelated to any reassembly. Just skip the fragment header. 2514018ea9aSBjoern A. Zeeb */ 2524018ea9aSBjoern A. Zeeb if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) { 2534018ea9aSBjoern A. Zeeb /* XXX-BZ we want dedicated counters for this. */ 2549cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_reassembled); 2554018ea9aSBjoern A. Zeeb in6_ifstat_inc(dstifp, ifs6_reass_ok); 2564018ea9aSBjoern A. Zeeb *offp = offset; 257a4061289SAndrey V. Elsukov m->m_flags |= M_FRAGMENTED; 2584018ea9aSBjoern A. Zeeb return (ip6f->ip6f_nxt); 2594018ea9aSBjoern A. Zeeb } 2604018ea9aSBjoern A. Zeeb 26180d7a853SJonathan T. Looney hashkeyp = hashkey; 26280d7a853SJonathan T. Looney memcpy(hashkeyp, &ip6->ip6_src, sizeof(struct in6_addr)); 26380d7a853SJonathan T. Looney hashkeyp += sizeof(struct in6_addr) / sizeof(*hashkeyp); 26480d7a853SJonathan T. Looney memcpy(hashkeyp, &ip6->ip6_dst, sizeof(struct in6_addr)); 26580d7a853SJonathan T. Looney hashkeyp += sizeof(struct in6_addr) / sizeof(*hashkeyp); 26680d7a853SJonathan T. Looney *hashkeyp = ip6f->ip6f_ident; 26780d7a853SJonathan T. Looney hash = jenkins_hash32(hashkey, nitems(hashkey), V_ip6q_hashseed); 26880d7a853SJonathan T. Looney hash &= IP6REASS_HMASK; 26980d7a853SJonathan T. Looney head = IP6Q_HEAD(hash); 27080d7a853SJonathan T. Looney IP6Q_LOCK(hash); 2719888c401SHajimu UMEMOTO 2729888c401SHajimu UMEMOTO /* 2739888c401SHajimu UMEMOTO * Enforce upper bound on number of fragments. 2749888c401SHajimu UMEMOTO * If maxfrag is 0, never accept fragments. 2759888c401SHajimu UMEMOTO * If maxfrag is -1, accept all fragments without limitation. 2769888c401SHajimu UMEMOTO */ 2772adfd64fSJonathan T. Looney if (ip6_maxfrags < 0) 2789888c401SHajimu UMEMOTO ; 2792adfd64fSJonathan T. Looney else if (atomic_load_int(&frag6_nfrags) >= (u_int)ip6_maxfrags) 2809888c401SHajimu UMEMOTO goto dropfrag; 28133841545SHajimu UMEMOTO 28280d7a853SJonathan T. Looney for (q6 = head->ip6q_next; q6 != head; q6 = q6->ip6q_next) 28382cd038dSYoshinobu Inoue if (ip6f->ip6f_ident == q6->ip6q_ident && 28482cd038dSYoshinobu Inoue IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &q6->ip6q_src) && 2854b908c8bSRobert Watson IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &q6->ip6q_dst) 2864b908c8bSRobert Watson #ifdef MAC 2874b908c8bSRobert Watson && mac_ip6q_match(m, q6) 2884b908c8bSRobert Watson #endif 2894b908c8bSRobert Watson ) 29082cd038dSYoshinobu Inoue break; 29182cd038dSYoshinobu Inoue 29280d7a853SJonathan T. Looney if (q6 == head) { 29382cd038dSYoshinobu Inoue /* 29482cd038dSYoshinobu Inoue * the first fragment to arrive, create a reassembly queue. 29582cd038dSYoshinobu Inoue */ 29682cd038dSYoshinobu Inoue first_frag = 1; 29782cd038dSYoshinobu Inoue 29882cd038dSYoshinobu Inoue /* 29982cd038dSYoshinobu Inoue * Enforce upper bound on number of fragmented packets 30082cd038dSYoshinobu Inoue * for which we attempt reassembly; 3019888c401SHajimu UMEMOTO * If maxfragpackets is 0, never accept fragments. 3029888c401SHajimu UMEMOTO * If maxfragpackets is -1, accept all fragments without 3039888c401SHajimu UMEMOTO * limitation. 30482cd038dSYoshinobu Inoue */ 305603724d3SBjoern A. Zeeb if (V_ip6_maxfragpackets < 0) 30633841545SHajimu UMEMOTO ; 30780d7a853SJonathan T. Looney else if (atomic_load_int(&V_frag6_nfragpackets) >= 30880d7a853SJonathan T. Looney (u_int)V_ip6_maxfragpackets) 30933841545SHajimu UMEMOTO goto dropfrag; 31080d7a853SJonathan T. Looney atomic_add_int(&V_frag6_nfragpackets, 1); 31182cd038dSYoshinobu Inoue q6 = (struct ip6q *)malloc(sizeof(struct ip6q), M_FTABLE, 3128c0dd0e4SHajimu UMEMOTO M_NOWAIT); 31382cd038dSYoshinobu Inoue if (q6 == NULL) 31482cd038dSYoshinobu Inoue goto dropfrag; 315686cdd19SJun-ichiro itojun Hagino bzero(q6, sizeof(*q6)); 3164b908c8bSRobert Watson #ifdef MAC 3174b908c8bSRobert Watson if (mac_ip6q_init(q6, M_NOWAIT) != 0) { 3184b908c8bSRobert Watson free(q6, M_FTABLE); 3194b908c8bSRobert Watson goto dropfrag; 3204b908c8bSRobert Watson } 3214b908c8bSRobert Watson mac_ip6q_create(m, q6); 3224b908c8bSRobert Watson #endif 32380d7a853SJonathan T. Looney frag6_insque_head(q6, head, hash); 32482cd038dSYoshinobu Inoue 325686cdd19SJun-ichiro itojun Hagino /* ip6q_nxt will be filled afterwards, from 1st fragment */ 32682cd038dSYoshinobu Inoue q6->ip6q_down = q6->ip6q_up = (struct ip6asfrag *)q6; 327686cdd19SJun-ichiro itojun Hagino #ifdef notyet 328686cdd19SJun-ichiro itojun Hagino q6->ip6q_nxtp = (u_char *)nxtp; 329686cdd19SJun-ichiro itojun Hagino #endif 33082cd038dSYoshinobu Inoue q6->ip6q_ident = ip6f->ip6f_ident; 33182cd038dSYoshinobu Inoue q6->ip6q_ttl = IPV6_FRAGTTL; 33282cd038dSYoshinobu Inoue q6->ip6q_src = ip6->ip6_src; 33382cd038dSYoshinobu Inoue q6->ip6q_dst = ip6->ip6_dst; 3345e9510e3SJINMEI Tatuya q6->ip6q_ecn = 3355e9510e3SJINMEI Tatuya (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 33682cd038dSYoshinobu Inoue q6->ip6q_unfrglen = -1; /* The 1st fragment has not arrived. */ 3379888c401SHajimu UMEMOTO 3389888c401SHajimu UMEMOTO q6->ip6q_nfrag = 0; 33982cd038dSYoshinobu Inoue } 34082cd038dSYoshinobu Inoue 34182cd038dSYoshinobu Inoue /* 34282cd038dSYoshinobu Inoue * If it's the 1st fragment, record the length of the 34382cd038dSYoshinobu Inoue * unfragmentable part and the next header of the fragment header. 34482cd038dSYoshinobu Inoue */ 34582cd038dSYoshinobu Inoue fragoff = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK); 34682cd038dSYoshinobu Inoue if (fragoff == 0) { 34706cd0a3fSHajimu UMEMOTO q6->ip6q_unfrglen = offset - sizeof(struct ip6_hdr) - 34806cd0a3fSHajimu UMEMOTO sizeof(struct ip6_frag); 34982cd038dSYoshinobu Inoue q6->ip6q_nxt = ip6f->ip6f_nxt; 35082cd038dSYoshinobu Inoue } 35182cd038dSYoshinobu Inoue 35282cd038dSYoshinobu Inoue /* 35382cd038dSYoshinobu Inoue * Check that the reassembled packet would not exceed 65535 bytes 35482cd038dSYoshinobu Inoue * in size. 35582cd038dSYoshinobu Inoue * If it would exceed, discard the fragment and return an ICMP error. 35682cd038dSYoshinobu Inoue */ 35782cd038dSYoshinobu Inoue frgpartlen = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - offset; 35882cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen >= 0) { 35982cd038dSYoshinobu Inoue /* The 1st fragment has already arrived. */ 36082cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + fragoff + frgpartlen > IPV6_MAXPACKET) { 36182cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 362686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 363686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 36480d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 36582cd038dSYoshinobu Inoue return (IPPROTO_DONE); 36682cd038dSYoshinobu Inoue } 36706cd0a3fSHajimu UMEMOTO } else if (fragoff + frgpartlen > IPV6_MAXPACKET) { 36882cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 369686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 370686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 37180d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 37282cd038dSYoshinobu Inoue return (IPPROTO_DONE); 37382cd038dSYoshinobu Inoue } 37482cd038dSYoshinobu Inoue /* 37582cd038dSYoshinobu Inoue * If it's the first fragment, do the above check for each 37682cd038dSYoshinobu Inoue * fragment already stored in the reassembly queue. 37782cd038dSYoshinobu Inoue */ 37882cd038dSYoshinobu Inoue if (fragoff == 0) { 37982cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 38082cd038dSYoshinobu Inoue af6 = af6dwn) { 38182cd038dSYoshinobu Inoue af6dwn = af6->ip6af_down; 38282cd038dSYoshinobu Inoue 38382cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + af6->ip6af_off + af6->ip6af_frglen > 38482cd038dSYoshinobu Inoue IPV6_MAXPACKET) { 38582cd038dSYoshinobu Inoue struct mbuf *merr = IP6_REASS_MBUF(af6); 38682cd038dSYoshinobu Inoue struct ip6_hdr *ip6err; 38782cd038dSYoshinobu Inoue int erroff = af6->ip6af_offset; 38882cd038dSYoshinobu Inoue 38982cd038dSYoshinobu Inoue /* dequeue the fragment. */ 39080d7a853SJonathan T. Looney frag6_deq(af6, hash); 391686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 39282cd038dSYoshinobu Inoue 39382cd038dSYoshinobu Inoue /* adjust pointer. */ 39482cd038dSYoshinobu Inoue ip6err = mtod(merr, struct ip6_hdr *); 39582cd038dSYoshinobu Inoue 39682cd038dSYoshinobu Inoue /* 39782cd038dSYoshinobu Inoue * Restore source and destination addresses 39882cd038dSYoshinobu Inoue * in the erroneous IPv6 header. 39982cd038dSYoshinobu Inoue */ 40082cd038dSYoshinobu Inoue ip6err->ip6_src = q6->ip6q_src; 40182cd038dSYoshinobu Inoue ip6err->ip6_dst = q6->ip6q_dst; 40282cd038dSYoshinobu Inoue 40382cd038dSYoshinobu Inoue icmp6_error(merr, ICMP6_PARAM_PROB, 40482cd038dSYoshinobu Inoue ICMP6_PARAMPROB_HEADER, 405686cdd19SJun-ichiro itojun Hagino erroff - sizeof(struct ip6_frag) + 406686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 40782cd038dSYoshinobu Inoue } 40882cd038dSYoshinobu Inoue } 40982cd038dSYoshinobu Inoue } 41082cd038dSYoshinobu Inoue 411686cdd19SJun-ichiro itojun Hagino ip6af = (struct ip6asfrag *)malloc(sizeof(struct ip6asfrag), M_FTABLE, 4128c0dd0e4SHajimu UMEMOTO M_NOWAIT); 413686cdd19SJun-ichiro itojun Hagino if (ip6af == NULL) 414686cdd19SJun-ichiro itojun Hagino goto dropfrag; 415686cdd19SJun-ichiro itojun Hagino bzero(ip6af, sizeof(*ip6af)); 41682cd038dSYoshinobu Inoue ip6af->ip6af_mff = ip6f->ip6f_offlg & IP6F_MORE_FRAG; 41782cd038dSYoshinobu Inoue ip6af->ip6af_off = fragoff; 41882cd038dSYoshinobu Inoue ip6af->ip6af_frglen = frgpartlen; 41982cd038dSYoshinobu Inoue ip6af->ip6af_offset = offset; 42082cd038dSYoshinobu Inoue IP6_REASS_MBUF(ip6af) = m; 42182cd038dSYoshinobu Inoue 42282cd038dSYoshinobu Inoue if (first_frag) { 42382cd038dSYoshinobu Inoue af6 = (struct ip6asfrag *)q6; 42482cd038dSYoshinobu Inoue goto insert; 42582cd038dSYoshinobu Inoue } 42682cd038dSYoshinobu Inoue 42782cd038dSYoshinobu Inoue /* 42859dfcba4SHajimu UMEMOTO * Handle ECN by comparing this segment with the first one; 42959dfcba4SHajimu UMEMOTO * if CE is set, do not lose CE. 43059dfcba4SHajimu UMEMOTO * drop if CE and not-ECT are mixed for the same packet. 43159dfcba4SHajimu UMEMOTO */ 43259dfcba4SHajimu UMEMOTO ecn = (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 4335e9510e3SJINMEI Tatuya ecn0 = q6->ip6q_ecn; 43459dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_CE) { 43559dfcba4SHajimu UMEMOTO if (ecn0 == IPTOS_ECN_NOTECT) { 43659dfcba4SHajimu UMEMOTO free(ip6af, M_FTABLE); 43759dfcba4SHajimu UMEMOTO goto dropfrag; 43859dfcba4SHajimu UMEMOTO } 43959dfcba4SHajimu UMEMOTO if (ecn0 != IPTOS_ECN_CE) 4405e9510e3SJINMEI Tatuya q6->ip6q_ecn = IPTOS_ECN_CE; 44159dfcba4SHajimu UMEMOTO } 44259dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT) { 44359dfcba4SHajimu UMEMOTO free(ip6af, M_FTABLE); 44459dfcba4SHajimu UMEMOTO goto dropfrag; 44559dfcba4SHajimu UMEMOTO } 44659dfcba4SHajimu UMEMOTO 44759dfcba4SHajimu UMEMOTO /* 44882cd038dSYoshinobu Inoue * Find a segment which begins after this one does. 44982cd038dSYoshinobu Inoue */ 45082cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 45182cd038dSYoshinobu Inoue af6 = af6->ip6af_down) 45282cd038dSYoshinobu Inoue if (af6->ip6af_off > ip6af->ip6af_off) 45382cd038dSYoshinobu Inoue break; 45482cd038dSYoshinobu Inoue 455686cdd19SJun-ichiro itojun Hagino #if 0 456686cdd19SJun-ichiro itojun Hagino /* 457686cdd19SJun-ichiro itojun Hagino * If there is a preceding segment, it may provide some of 458686cdd19SJun-ichiro itojun Hagino * our data already. If so, drop the data from the incoming 459686cdd19SJun-ichiro itojun Hagino * segment. If it provides all of our data, drop us. 460686cdd19SJun-ichiro itojun Hagino */ 461686cdd19SJun-ichiro itojun Hagino if (af6->ip6af_up != (struct ip6asfrag *)q6) { 462686cdd19SJun-ichiro itojun Hagino i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 463686cdd19SJun-ichiro itojun Hagino - ip6af->ip6af_off; 464686cdd19SJun-ichiro itojun Hagino if (i > 0) { 465686cdd19SJun-ichiro itojun Hagino if (i >= ip6af->ip6af_frglen) 466686cdd19SJun-ichiro itojun Hagino goto dropfrag; 467686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(ip6af), i); 468686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off += i; 469686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_frglen -= i; 470686cdd19SJun-ichiro itojun Hagino } 471686cdd19SJun-ichiro itojun Hagino } 472686cdd19SJun-ichiro itojun Hagino 473686cdd19SJun-ichiro itojun Hagino /* 474686cdd19SJun-ichiro itojun Hagino * While we overlap succeeding segments trim them or, 475686cdd19SJun-ichiro itojun Hagino * if they are completely covered, dequeue them. 476686cdd19SJun-ichiro itojun Hagino */ 477686cdd19SJun-ichiro itojun Hagino while (af6 != (struct ip6asfrag *)q6 && 478686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off + ip6af->ip6af_frglen > af6->ip6af_off) { 479686cdd19SJun-ichiro itojun Hagino i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 480686cdd19SJun-ichiro itojun Hagino if (i < af6->ip6af_frglen) { 481686cdd19SJun-ichiro itojun Hagino af6->ip6af_frglen -= i; 482686cdd19SJun-ichiro itojun Hagino af6->ip6af_off += i; 483686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(af6), i); 484686cdd19SJun-ichiro itojun Hagino break; 485686cdd19SJun-ichiro itojun Hagino } 486686cdd19SJun-ichiro itojun Hagino af6 = af6->ip6af_down; 487686cdd19SJun-ichiro itojun Hagino m_freem(IP6_REASS_MBUF(af6->ip6af_up)); 48880d7a853SJonathan T. Looney frag6_deq(af6->ip6af_up, hash); 489686cdd19SJun-ichiro itojun Hagino } 490686cdd19SJun-ichiro itojun Hagino #else 49182cd038dSYoshinobu Inoue /* 49282cd038dSYoshinobu Inoue * If the incoming framgent overlaps some existing fragments in 49382cd038dSYoshinobu Inoue * the reassembly queue, drop it, since it is dangerous to override 49482cd038dSYoshinobu Inoue * existing fragments from a security point of view. 4959888c401SHajimu UMEMOTO * We don't know which fragment is the bad guy - here we trust 4969888c401SHajimu UMEMOTO * fragment that came in earlier, with no real reason. 4975e9510e3SJINMEI Tatuya * 4985e9510e3SJINMEI Tatuya * Note: due to changes after disabling this part, mbuf passed to 4995e9510e3SJINMEI Tatuya * m_adj() below now does not meet the requirement. 50082cd038dSYoshinobu Inoue */ 50182cd038dSYoshinobu Inoue if (af6->ip6af_up != (struct ip6asfrag *)q6) { 50282cd038dSYoshinobu Inoue i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 50382cd038dSYoshinobu Inoue - ip6af->ip6af_off; 50482cd038dSYoshinobu Inoue if (i > 0) { 5052bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 50682cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 50782cd038dSYoshinobu Inoue "overlaps the previous fragment\n", 5081d54aa3bSBjoern A. Zeeb i, ip6_sprintf(ip6buf, &q6->ip6q_src)); 5092bf76779SMunechika SUMIKAWA #endif 5102bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 51182cd038dSYoshinobu Inoue goto dropfrag; 51282cd038dSYoshinobu Inoue } 51382cd038dSYoshinobu Inoue } 51482cd038dSYoshinobu Inoue if (af6 != (struct ip6asfrag *)q6) { 51582cd038dSYoshinobu Inoue i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 51682cd038dSYoshinobu Inoue if (i > 0) { 5172bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 51882cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 51982cd038dSYoshinobu Inoue "overlaps the succeeding fragment", 5201d54aa3bSBjoern A. Zeeb i, ip6_sprintf(ip6buf, &q6->ip6q_src)); 5212bf76779SMunechika SUMIKAWA #endif 5222bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 52382cd038dSYoshinobu Inoue goto dropfrag; 52482cd038dSYoshinobu Inoue } 52582cd038dSYoshinobu Inoue } 526686cdd19SJun-ichiro itojun Hagino #endif 52782cd038dSYoshinobu Inoue 52882cd038dSYoshinobu Inoue insert: 5294b908c8bSRobert Watson #ifdef MAC 5304b908c8bSRobert Watson if (!first_frag) 5314b908c8bSRobert Watson mac_ip6q_update(m, q6); 5324b908c8bSRobert Watson #endif 53382cd038dSYoshinobu Inoue 53482cd038dSYoshinobu Inoue /* 53582cd038dSYoshinobu Inoue * Stick new segment in its place; 53682cd038dSYoshinobu Inoue * check for complete reassembly. 53703c99d76SJonathan T. Looney * If not complete, check fragment limit. 53882cd038dSYoshinobu Inoue * Move to front of packet queue, as we are 53982cd038dSYoshinobu Inoue * the most recently active fragmented packet. 54082cd038dSYoshinobu Inoue */ 54180d7a853SJonathan T. Looney frag6_enq(ip6af, af6->ip6af_up, hash); 5422adfd64fSJonathan T. Looney atomic_add_int(&frag6_nfrags, 1); 5439888c401SHajimu UMEMOTO q6->ip6q_nfrag++; 544686cdd19SJun-ichiro itojun Hagino #if 0 /* xxx */ 54580d7a853SJonathan T. Looney if (q6 != head->ip6q_next) { 54680d7a853SJonathan T. Looney frag6_remque(q6, hash); 54780d7a853SJonathan T. Looney frag6_insque_head(q6, head, hash); 548686cdd19SJun-ichiro itojun Hagino } 549686cdd19SJun-ichiro itojun Hagino #endif 55082cd038dSYoshinobu Inoue next = 0; 55182cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 55282cd038dSYoshinobu Inoue af6 = af6->ip6af_down) { 55382cd038dSYoshinobu Inoue if (af6->ip6af_off != next) { 55403c99d76SJonathan T. Looney if (q6->ip6q_nfrag > V_ip6_maxfragsperpacket) { 55503c99d76SJonathan T. Looney IP6STAT_INC(ip6s_fragdropped); 55603c99d76SJonathan T. Looney frag6_freef(q6, hash); 55703c99d76SJonathan T. Looney } 55880d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 55982cd038dSYoshinobu Inoue return IPPROTO_DONE; 56082cd038dSYoshinobu Inoue } 56182cd038dSYoshinobu Inoue next += af6->ip6af_frglen; 56282cd038dSYoshinobu Inoue } 56382cd038dSYoshinobu Inoue if (af6->ip6af_up->ip6af_mff) { 56403c99d76SJonathan T. Looney if (q6->ip6q_nfrag > V_ip6_maxfragsperpacket) { 56503c99d76SJonathan T. Looney IP6STAT_INC(ip6s_fragdropped); 56603c99d76SJonathan T. Looney frag6_freef(q6, hash); 56703c99d76SJonathan T. Looney } 56880d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 56982cd038dSYoshinobu Inoue return IPPROTO_DONE; 57082cd038dSYoshinobu Inoue } 57182cd038dSYoshinobu Inoue 57282cd038dSYoshinobu Inoue /* 57382cd038dSYoshinobu Inoue * Reassembly is complete; concatenate fragments. 57482cd038dSYoshinobu Inoue */ 57582cd038dSYoshinobu Inoue ip6af = q6->ip6q_down; 57682cd038dSYoshinobu Inoue t = m = IP6_REASS_MBUF(ip6af); 57782cd038dSYoshinobu Inoue af6 = ip6af->ip6af_down; 57880d7a853SJonathan T. Looney frag6_deq(ip6af, hash); 57982cd038dSYoshinobu Inoue while (af6 != (struct ip6asfrag *)q6) { 5809907aba3SAndrey V. Elsukov m->m_pkthdr.csum_flags &= 5819907aba3SAndrey V. Elsukov IP6_REASS_MBUF(af6)->m_pkthdr.csum_flags; 5829907aba3SAndrey V. Elsukov m->m_pkthdr.csum_data += 5839907aba3SAndrey V. Elsukov IP6_REASS_MBUF(af6)->m_pkthdr.csum_data; 5849907aba3SAndrey V. Elsukov 585686cdd19SJun-ichiro itojun Hagino af6dwn = af6->ip6af_down; 58680d7a853SJonathan T. Looney frag6_deq(af6, hash); 58782cd038dSYoshinobu Inoue while (t->m_next) 58882cd038dSYoshinobu Inoue t = t->m_next; 589ba99cc0bSAlexander V. Chernikov m_adj(IP6_REASS_MBUF(af6), af6->ip6af_offset); 59009b0b8c0SNavdeep Parhar m_demote_pkthdr(IP6_REASS_MBUF(af6)); 591ba99cc0bSAlexander V. Chernikov m_cat(t, IP6_REASS_MBUF(af6)); 592686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 593686cdd19SJun-ichiro itojun Hagino af6 = af6dwn; 59482cd038dSYoshinobu Inoue } 59582cd038dSYoshinobu Inoue 5969907aba3SAndrey V. Elsukov while (m->m_pkthdr.csum_data & 0xffff0000) 5979907aba3SAndrey V. Elsukov m->m_pkthdr.csum_data = (m->m_pkthdr.csum_data & 0xffff) + 5989907aba3SAndrey V. Elsukov (m->m_pkthdr.csum_data >> 16); 5999907aba3SAndrey V. Elsukov 60082cd038dSYoshinobu Inoue /* adjust offset to point where the original next header starts */ 60182cd038dSYoshinobu Inoue offset = ip6af->ip6af_offset - sizeof(struct ip6_frag); 602686cdd19SJun-ichiro itojun Hagino free(ip6af, M_FTABLE); 603686cdd19SJun-ichiro itojun Hagino ip6 = mtod(m, struct ip6_hdr *); 60482cd038dSYoshinobu Inoue ip6->ip6_plen = htons((u_short)next + offset - sizeof(struct ip6_hdr)); 6055e9510e3SJINMEI Tatuya if (q6->ip6q_ecn == IPTOS_ECN_CE) 6065e9510e3SJINMEI Tatuya ip6->ip6_flow |= htonl(IPTOS_ECN_CE << 20); 60782cd038dSYoshinobu Inoue nxt = q6->ip6q_nxt; 608686cdd19SJun-ichiro itojun Hagino #ifdef notyet 609686cdd19SJun-ichiro itojun Hagino *q6->ip6q_nxtp = (u_char)(nxt & 0xff); 610686cdd19SJun-ichiro itojun Hagino #endif 61182cd038dSYoshinobu Inoue 6120b438b0fSGleb Smirnoff if (ip6_deletefraghdr(m, offset, M_NOWAIT) != 0) { 61380d7a853SJonathan T. Looney frag6_remque(q6, hash); 6142adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 6154b908c8bSRobert Watson #ifdef MAC 6164b908c8bSRobert Watson mac_ip6q_destroy(q6); 6174b908c8bSRobert Watson #endif 618686cdd19SJun-ichiro itojun Hagino free(q6, M_FTABLE); 61980d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 6200b438b0fSGleb Smirnoff 621686cdd19SJun-ichiro itojun Hagino goto dropfrag; 62282cd038dSYoshinobu Inoue } 62382cd038dSYoshinobu Inoue 62482cd038dSYoshinobu Inoue /* 62582cd038dSYoshinobu Inoue * Store NXT to the original. 62682cd038dSYoshinobu Inoue */ 62768e0e5a6SAndrey V. Elsukov m_copyback(m, ip6_get_prevhdr(m, offset), sizeof(uint8_t), 62868e0e5a6SAndrey V. Elsukov (caddr_t)&nxt); 62982cd038dSYoshinobu Inoue 63080d7a853SJonathan T. Looney frag6_remque(q6, hash); 6312adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 6324b908c8bSRobert Watson #ifdef MAC 6334b908c8bSRobert Watson mac_ip6q_reassemble(q6, m); 6344b908c8bSRobert Watson mac_ip6q_destroy(q6); 6354b908c8bSRobert Watson #endif 63682cd038dSYoshinobu Inoue free(q6, M_FTABLE); 63780d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 63882cd038dSYoshinobu Inoue 63982cd038dSYoshinobu Inoue if (m->m_flags & M_PKTHDR) { /* Isn't it always true? */ 64082cd038dSYoshinobu Inoue int plen = 0; 64182cd038dSYoshinobu Inoue for (t = m; t; t = t->m_next) 64282cd038dSYoshinobu Inoue plen += t->m_len; 64382cd038dSYoshinobu Inoue m->m_pkthdr.len = plen; 64482cd038dSYoshinobu Inoue } 64582cd038dSYoshinobu Inoue 646aaa46574SAdrian Chadd #ifdef RSS 647aaa46574SAdrian Chadd mtag = m_tag_alloc(MTAG_ABI_IPV6, IPV6_TAG_DIRECT, sizeof(*ip6dc), 648aaa46574SAdrian Chadd M_NOWAIT); 649aaa46574SAdrian Chadd if (mtag == NULL) 650aaa46574SAdrian Chadd goto dropfrag; 651aaa46574SAdrian Chadd 652aaa46574SAdrian Chadd ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 653aaa46574SAdrian Chadd ip6dc->ip6dc_nxt = nxt; 654aaa46574SAdrian Chadd ip6dc->ip6dc_off = offset; 655aaa46574SAdrian Chadd 656aaa46574SAdrian Chadd m_tag_prepend(m, mtag); 657aaa46574SAdrian Chadd #endif 658aaa46574SAdrian Chadd 65980d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 6609cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_reassembled); 66182cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_ok); 66282cd038dSYoshinobu Inoue 663aaa46574SAdrian Chadd #ifdef RSS 664aaa46574SAdrian Chadd /* 665aaa46574SAdrian Chadd * Queue/dispatch for reprocessing. 666aaa46574SAdrian Chadd */ 667aaa46574SAdrian Chadd netisr_dispatch(NETISR_IPV6_DIRECT, m); 668aaa46574SAdrian Chadd return IPPROTO_DONE; 669aaa46574SAdrian Chadd #endif 670aaa46574SAdrian Chadd 67182cd038dSYoshinobu Inoue /* 67282cd038dSYoshinobu Inoue * Tell launch routine the next header 67382cd038dSYoshinobu Inoue */ 67482cd038dSYoshinobu Inoue 67582cd038dSYoshinobu Inoue *mp = m; 67682cd038dSYoshinobu Inoue *offp = offset; 67782cd038dSYoshinobu Inoue 67882cd038dSYoshinobu Inoue return nxt; 67982cd038dSYoshinobu Inoue 68082cd038dSYoshinobu Inoue dropfrag: 68180d7a853SJonathan T. Looney IP6Q_UNLOCK(hash); 68282cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 6839cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 68482cd038dSYoshinobu Inoue m_freem(m); 68582cd038dSYoshinobu Inoue return IPPROTO_DONE; 68682cd038dSYoshinobu Inoue } 68782cd038dSYoshinobu Inoue 68882cd038dSYoshinobu Inoue /* 68982cd038dSYoshinobu Inoue * Free a fragment reassembly header and all 69082cd038dSYoshinobu Inoue * associated datagrams. 69182cd038dSYoshinobu Inoue */ 69280d7a853SJonathan T. Looney static void 69380d7a853SJonathan T. Looney frag6_freef(struct ip6q *q6, uint32_t bucket) 69482cd038dSYoshinobu Inoue { 69582cd038dSYoshinobu Inoue struct ip6asfrag *af6, *down6; 69682cd038dSYoshinobu Inoue 69780d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 6989888c401SHajimu UMEMOTO 69982cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 70082cd038dSYoshinobu Inoue af6 = down6) { 70182cd038dSYoshinobu Inoue struct mbuf *m = IP6_REASS_MBUF(af6); 70282cd038dSYoshinobu Inoue 70382cd038dSYoshinobu Inoue down6 = af6->ip6af_down; 70480d7a853SJonathan T. Looney frag6_deq(af6, bucket); 70582cd038dSYoshinobu Inoue 70682cd038dSYoshinobu Inoue /* 70782cd038dSYoshinobu Inoue * Return ICMP time exceeded error for the 1st fragment. 70882cd038dSYoshinobu Inoue * Just free other fragments. 70982cd038dSYoshinobu Inoue */ 71082cd038dSYoshinobu Inoue if (af6->ip6af_off == 0) { 71182cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 71282cd038dSYoshinobu Inoue 71382cd038dSYoshinobu Inoue /* adjust pointer */ 71482cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 71582cd038dSYoshinobu Inoue 71606cd0a3fSHajimu UMEMOTO /* restore source and destination addresses */ 71782cd038dSYoshinobu Inoue ip6->ip6_src = q6->ip6q_src; 71882cd038dSYoshinobu Inoue ip6->ip6_dst = q6->ip6q_dst; 71982cd038dSYoshinobu Inoue 72082cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_TIME_EXCEEDED, 72182cd038dSYoshinobu Inoue ICMP6_TIME_EXCEED_REASSEMBLY, 0); 722686cdd19SJun-ichiro itojun Hagino } else 72382cd038dSYoshinobu Inoue m_freem(m); 724686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 72582cd038dSYoshinobu Inoue } 72680d7a853SJonathan T. Looney frag6_remque(q6, bucket); 7272adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 7284b908c8bSRobert Watson #ifdef MAC 7294b908c8bSRobert Watson mac_ip6q_destroy(q6); 7304b908c8bSRobert Watson #endif 73182cd038dSYoshinobu Inoue free(q6, M_FTABLE); 73280d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 73382cd038dSYoshinobu Inoue } 73482cd038dSYoshinobu Inoue 73582cd038dSYoshinobu Inoue /* 73682cd038dSYoshinobu Inoue * Put an ip fragment on a reassembly chain. 73782cd038dSYoshinobu Inoue * Like insque, but pointers in middle of structure. 73882cd038dSYoshinobu Inoue */ 73980d7a853SJonathan T. Looney static void 74080d7a853SJonathan T. Looney frag6_enq(struct ip6asfrag *af6, struct ip6asfrag *up6, 74180d7a853SJonathan T. Looney uint32_t bucket __unused) 74282cd038dSYoshinobu Inoue { 7439888c401SHajimu UMEMOTO 74480d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 7459888c401SHajimu UMEMOTO 74682cd038dSYoshinobu Inoue af6->ip6af_up = up6; 74782cd038dSYoshinobu Inoue af6->ip6af_down = up6->ip6af_down; 74882cd038dSYoshinobu Inoue up6->ip6af_down->ip6af_up = af6; 74982cd038dSYoshinobu Inoue up6->ip6af_down = af6; 75082cd038dSYoshinobu Inoue } 75182cd038dSYoshinobu Inoue 75282cd038dSYoshinobu Inoue /* 75382cd038dSYoshinobu Inoue * To frag6_enq as remque is to insque. 75482cd038dSYoshinobu Inoue */ 75580d7a853SJonathan T. Looney static void 75680d7a853SJonathan T. Looney frag6_deq(struct ip6asfrag *af6, uint32_t bucket __unused) 75782cd038dSYoshinobu Inoue { 7589888c401SHajimu UMEMOTO 75980d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 7609888c401SHajimu UMEMOTO 76182cd038dSYoshinobu Inoue af6->ip6af_up->ip6af_down = af6->ip6af_down; 76282cd038dSYoshinobu Inoue af6->ip6af_down->ip6af_up = af6->ip6af_up; 76382cd038dSYoshinobu Inoue } 76482cd038dSYoshinobu Inoue 76580d7a853SJonathan T. Looney static void 76680d7a853SJonathan T. Looney frag6_insque_head(struct ip6q *new, struct ip6q *old, uint32_t bucket __unused) 76782cd038dSYoshinobu Inoue { 7689888c401SHajimu UMEMOTO 76980d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 77080d7a853SJonathan T. Looney KASSERT(IP6Q_HEAD(bucket) == old, 77180d7a853SJonathan T. Looney ("%s: attempt to insert at head of wrong bucket" 77280d7a853SJonathan T. Looney " (bucket=%u, old=%p)", __func__, bucket, old)); 7739888c401SHajimu UMEMOTO 77482cd038dSYoshinobu Inoue new->ip6q_prev = old; 77582cd038dSYoshinobu Inoue new->ip6q_next = old->ip6q_next; 77682cd038dSYoshinobu Inoue old->ip6q_next->ip6q_prev= new; 77782cd038dSYoshinobu Inoue old->ip6q_next = new; 77882cd038dSYoshinobu Inoue } 77982cd038dSYoshinobu Inoue 78080d7a853SJonathan T. Looney static void 78180d7a853SJonathan T. Looney frag6_remque(struct ip6q *p6, uint32_t bucket __unused) 78282cd038dSYoshinobu Inoue { 7839888c401SHajimu UMEMOTO 78480d7a853SJonathan T. Looney IP6Q_LOCK_ASSERT(bucket); 7859888c401SHajimu UMEMOTO 78682cd038dSYoshinobu Inoue p6->ip6q_prev->ip6q_next = p6->ip6q_next; 78782cd038dSYoshinobu Inoue p6->ip6q_next->ip6q_prev = p6->ip6q_prev; 78882cd038dSYoshinobu Inoue } 78982cd038dSYoshinobu Inoue 79082cd038dSYoshinobu Inoue /* 79133841545SHajimu UMEMOTO * IPv6 reassembling timer processing; 79282cd038dSYoshinobu Inoue * if a timer expires on a reassembly 79382cd038dSYoshinobu Inoue * queue, discard it. 79482cd038dSYoshinobu Inoue */ 79582cd038dSYoshinobu Inoue void 7961272577eSXin LI frag6_slowtimo(void) 79782cd038dSYoshinobu Inoue { 7988b615593SMarko Zec VNET_ITERATOR_DECL(vnet_iter); 79980d7a853SJonathan T. Looney struct ip6q *head, *q6; 80080d7a853SJonathan T. Looney int i; 80182cd038dSYoshinobu Inoue 8025ee847d3SRobert Watson VNET_LIST_RLOCK_NOSLEEP(); 8038b615593SMarko Zec VNET_FOREACH(vnet_iter) { 8048b615593SMarko Zec CURVNET_SET(vnet_iter); 80580d7a853SJonathan T. Looney for (i = 0; i < IP6REASS_NHASH; i++) { 80680d7a853SJonathan T. Looney IP6Q_LOCK(i); 80780d7a853SJonathan T. Looney head = IP6Q_HEAD(i); 80880d7a853SJonathan T. Looney q6 = head->ip6q_next; 80982cd038dSYoshinobu Inoue if (q6) 81080d7a853SJonathan T. Looney while (q6 != head) { 81182cd038dSYoshinobu Inoue --q6->ip6q_ttl; 81282cd038dSYoshinobu Inoue q6 = q6->ip6q_next; 81382cd038dSYoshinobu Inoue if (q6->ip6q_prev->ip6q_ttl == 0) { 8149cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragtimeout); 81582cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 81680d7a853SJonathan T. Looney frag6_freef(q6->ip6q_prev, i); 81782cd038dSYoshinobu Inoue } 81882cd038dSYoshinobu Inoue } 81982cd038dSYoshinobu Inoue /* 82082cd038dSYoshinobu Inoue * If we are over the maximum number of fragments 82182cd038dSYoshinobu Inoue * (due to the limit being lowered), drain off 82282cd038dSYoshinobu Inoue * enough to get down to the new limit. 82382cd038dSYoshinobu Inoue */ 82480d7a853SJonathan T. Looney while (atomic_load_int(&V_frag6_nfragpackets) > 82580d7a853SJonathan T. Looney (u_int)V_ip6_maxfragpackets && 82680d7a853SJonathan T. Looney head->ip6q_prev != head) { 8279cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragoverflow); 82882cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 82980d7a853SJonathan T. Looney frag6_freef(head->ip6q_prev, i); 83080d7a853SJonathan T. Looney } 83180d7a853SJonathan T. Looney IP6Q_UNLOCK(i); 83282cd038dSYoshinobu Inoue } 8338b615593SMarko Zec CURVNET_RESTORE(); 8348b615593SMarko Zec } 8355ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 83682cd038dSYoshinobu Inoue } 83782cd038dSYoshinobu Inoue 83882cd038dSYoshinobu Inoue /* 83982cd038dSYoshinobu Inoue * Drain off all datagram fragments. 84082cd038dSYoshinobu Inoue */ 84182cd038dSYoshinobu Inoue void 8421272577eSXin LI frag6_drain(void) 84382cd038dSYoshinobu Inoue { 8448b615593SMarko Zec VNET_ITERATOR_DECL(vnet_iter); 84580d7a853SJonathan T. Looney struct ip6q *head; 84680d7a853SJonathan T. Looney int i; 8479888c401SHajimu UMEMOTO 8485ee847d3SRobert Watson VNET_LIST_RLOCK_NOSLEEP(); 8498b615593SMarko Zec VNET_FOREACH(vnet_iter) { 8508b615593SMarko Zec CURVNET_SET(vnet_iter); 85180d7a853SJonathan T. Looney for (i = 0; i < IP6REASS_NHASH; i++) { 85280d7a853SJonathan T. Looney if (IP6Q_TRYLOCK(i) == 0) 85380d7a853SJonathan T. Looney continue; 85480d7a853SJonathan T. Looney head = IP6Q_HEAD(i); 85580d7a853SJonathan T. Looney while (head->ip6q_next != head) { 8569cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 85782cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 85880d7a853SJonathan T. Looney frag6_freef(head->ip6q_next, i); 85980d7a853SJonathan T. Looney } 86080d7a853SJonathan T. Looney IP6Q_UNLOCK(i); 86182cd038dSYoshinobu Inoue } 8628b615593SMarko Zec CURVNET_RESTORE(); 8638b615593SMarko Zec } 8645ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 86582cd038dSYoshinobu Inoue } 866e5ee7060SGleb Smirnoff 867e5ee7060SGleb Smirnoff int 868e5ee7060SGleb Smirnoff ip6_deletefraghdr(struct mbuf *m, int offset, int wait) 869e5ee7060SGleb Smirnoff { 870e5ee7060SGleb Smirnoff struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 871e5ee7060SGleb Smirnoff struct mbuf *t; 872e5ee7060SGleb Smirnoff 873e5ee7060SGleb Smirnoff /* Delete frag6 header. */ 874e5ee7060SGleb Smirnoff if (m->m_len >= offset + sizeof(struct ip6_frag)) { 875e5ee7060SGleb Smirnoff /* This is the only possible case with !PULLDOWN_TEST. */ 876e5ee7060SGleb Smirnoff bcopy(ip6, (char *)ip6 + sizeof(struct ip6_frag), 877e5ee7060SGleb Smirnoff offset); 878e5ee7060SGleb Smirnoff m->m_data += sizeof(struct ip6_frag); 879e5ee7060SGleb Smirnoff m->m_len -= sizeof(struct ip6_frag); 880e5ee7060SGleb Smirnoff } else { 881e5ee7060SGleb Smirnoff /* This comes with no copy if the boundary is on cluster. */ 882e5ee7060SGleb Smirnoff if ((t = m_split(m, offset, wait)) == NULL) 883e5ee7060SGleb Smirnoff return (ENOMEM); 884e5ee7060SGleb Smirnoff m_adj(t, sizeof(struct ip6_frag)); 885e5ee7060SGleb Smirnoff m_cat(m, t); 886e5ee7060SGleb Smirnoff } 887e5ee7060SGleb Smirnoff 888a4061289SAndrey V. Elsukov m->m_flags |= M_FRAGMENTED; 889e5ee7060SGleb Smirnoff return (0); 890e5ee7060SGleb Smirnoff } 891