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. 621f08a07SBjoern A. Zeeb * Copyright (c) 2019 Netflix, Inc. 782cd038dSYoshinobu Inoue * 882cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 982cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 1082cd038dSYoshinobu Inoue * are met: 1182cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 1282cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 1382cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 1482cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 1582cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 1682cd038dSYoshinobu Inoue * 3. Neither the name of the project nor the names of its contributors 1782cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 1882cd038dSYoshinobu Inoue * without specific prior written permission. 1982cd038dSYoshinobu Inoue * 2082cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2182cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2282cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2382cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2482cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2582cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2682cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2782cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2882cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2982cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3082cd038dSYoshinobu Inoue * SUCH DAMAGE. 31b48287a3SDavid E. O'Brien * 32b48287a3SDavid E. O'Brien * $KAME: frag6.c,v 1.33 2002/01/07 11:34:48 kjc Exp $ 3382cd038dSYoshinobu Inoue */ 3482cd038dSYoshinobu Inoue 35b48287a3SDavid E. O'Brien #include <sys/cdefs.h> 36b48287a3SDavid E. O'Brien __FBSDID("$FreeBSD$"); 37b48287a3SDavid E. O'Brien 38aaa46574SAdrian Chadd #include "opt_rss.h" 39aaa46574SAdrian Chadd 4082cd038dSYoshinobu Inoue #include <sys/param.h> 41f349c821SBjoern A. Zeeb #include <sys/systm.h> 421a3044faSBjoern A. Zeeb #include <sys/domain.h> 431a3044faSBjoern A. Zeeb #include <sys/eventhandler.h> 4480d7a853SJonathan T. Looney #include <sys/hash.h> 451a3044faSBjoern A. Zeeb #include <sys/kernel.h> 4682cd038dSYoshinobu Inoue #include <sys/malloc.h> 4782cd038dSYoshinobu Inoue #include <sys/mbuf.h> 4882cd038dSYoshinobu Inoue #include <sys/protosw.h> 4921f08a07SBjoern A. Zeeb #include <sys/queue.h> 5082cd038dSYoshinobu Inoue #include <sys/socket.h> 51757cb678SBjoern A. Zeeb #include <sys/sysctl.h> 5282cd038dSYoshinobu Inoue #include <sys/syslog.h> 5382cd038dSYoshinobu Inoue 5482cd038dSYoshinobu Inoue #include <net/if.h> 5576039bc8SGleb Smirnoff #include <net/if_var.h> 56aaa46574SAdrian Chadd #include <net/netisr.h> 5782cd038dSYoshinobu Inoue #include <net/route.h> 58eddfbb76SRobert Watson #include <net/vnet.h> 5982cd038dSYoshinobu Inoue 6082cd038dSYoshinobu Inoue #include <netinet/in.h> 6182cd038dSYoshinobu Inoue #include <netinet/in_var.h> 62686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h> 6382cd038dSYoshinobu Inoue #include <netinet6/ip6_var.h> 64686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h> 6523d374aaSBjoern A. Zeeb #include <netinet/in_systm.h> /* For ECN definitions. */ 6623d374aaSBjoern A. Zeeb #include <netinet/ip.h> /* For ECN definitions. */ 6782cd038dSYoshinobu Inoue 681a3044faSBjoern A. Zeeb #ifdef MAC 694b908c8bSRobert Watson #include <security/mac/mac_framework.h> 701a3044faSBjoern A. Zeeb #endif 714b908c8bSRobert Watson 72f1664f32SBjoern A. Zeeb /* 73f1664f32SBjoern A. Zeeb * A "big picture" of how IPv6 fragment queues are all linked together. 74f1664f32SBjoern A. Zeeb * 75f1664f32SBjoern A. Zeeb * struct ip6qbucket ip6qb[...]; hashed buckets 76f1664f32SBjoern A. Zeeb * |||||||| 77f1664f32SBjoern A. Zeeb * | 78f1664f32SBjoern A. Zeeb * +--- TAILQ(struct ip6q, packets) *q6; tailq entries holding 79f1664f32SBjoern A. Zeeb * |||||||| fragmented packets 80f1664f32SBjoern A. Zeeb * | (1 per original packet) 81f1664f32SBjoern A. Zeeb * | 82f1664f32SBjoern A. Zeeb * +--- TAILQ(struct ip6asfrag, ip6q_frags) *af6; tailq entries of IPv6 83f1664f32SBjoern A. Zeeb * | *ip6af;fragment packets 84f1664f32SBjoern A. Zeeb * | for one original packet 85f1664f32SBjoern A. Zeeb * + *mbuf 86f1664f32SBjoern A. Zeeb */ 87f1664f32SBjoern A. Zeeb 8823d374aaSBjoern A. Zeeb /* Reassembly headers are stored in hash buckets. */ 892ceeacbeSJonathan T. Looney #define IP6REASS_NHASH_LOG2 10 9080d7a853SJonathan T. Looney #define IP6REASS_NHASH (1 << IP6REASS_NHASH_LOG2) 9180d7a853SJonathan T. Looney #define IP6REASS_HMASK (IP6REASS_NHASH - 1) 9280d7a853SJonathan T. Looney 9321f08a07SBjoern A. Zeeb TAILQ_HEAD(ip6qhead, ip6q); 9480d7a853SJonathan T. Looney struct ip6qbucket { 9521f08a07SBjoern A. Zeeb struct ip6qhead packets; 9680d7a853SJonathan T. Looney struct mtx lock; 971e9f3b73SJonathan T. Looney int count; 9880d7a853SJonathan T. Looney }; 9980d7a853SJonathan T. Looney 1001540a98eSBjoern A. Zeeb struct ip6asfrag { 10121f08a07SBjoern A. Zeeb TAILQ_ENTRY(ip6asfrag) ip6af_tq; 1021540a98eSBjoern A. Zeeb struct mbuf *ip6af_m; 103f1664f32SBjoern A. Zeeb int ip6af_offset; /* Offset in ip6af_m to next header. */ 104f1664f32SBjoern A. Zeeb int ip6af_frglen; /* Fragmentable part length. */ 105f1664f32SBjoern A. Zeeb int ip6af_off; /* Fragment offset. */ 106f1664f32SBjoern A. Zeeb bool ip6af_mff; /* More fragment bit in frag off. */ 1071540a98eSBjoern A. Zeeb }; 1081540a98eSBjoern A. Zeeb 109487a161cSBjoern A. Zeeb static MALLOC_DEFINE(M_FRAG6, "frag6", "IPv6 fragment reassembly header"); 110487a161cSBjoern A. Zeeb 11167a10c46SBjoern A. Zeeb #ifdef VIMAGE 11267a10c46SBjoern A. Zeeb /* A flag to indicate if IPv6 fragmentation is initialized. */ 11367a10c46SBjoern A. Zeeb VNET_DEFINE_STATIC(bool, frag6_on); 11467a10c46SBjoern A. Zeeb #define V_frag6_on VNET(frag6_on) 11567a10c46SBjoern A. Zeeb #endif 11667a10c46SBjoern A. Zeeb 117757cb678SBjoern A. Zeeb /* System wide (global) maximum and count of packets in reassembly queues. */ 118757cb678SBjoern A. Zeeb static int ip6_maxfrags; 119757cb678SBjoern A. Zeeb static volatile u_int frag6_nfrags = 0; 120757cb678SBjoern A. Zeeb 121757cb678SBjoern A. Zeeb /* Maximum and current packets in per-VNET reassembly queue. */ 122757cb678SBjoern A. Zeeb VNET_DEFINE_STATIC(int, ip6_maxfragpackets); 12380d7a853SJonathan T. Looney VNET_DEFINE_STATIC(volatile u_int, frag6_nfragpackets); 124757cb678SBjoern A. Zeeb #define V_ip6_maxfragpackets VNET(ip6_maxfragpackets) 125757cb678SBjoern A. Zeeb #define V_frag6_nfragpackets VNET(frag6_nfragpackets) 126757cb678SBjoern A. Zeeb 127757cb678SBjoern A. Zeeb /* Maximum per-VNET reassembly queues per bucket and fragments per packet. */ 128757cb678SBjoern A. Zeeb VNET_DEFINE_STATIC(int, ip6_maxfragbucketsize); 129757cb678SBjoern A. Zeeb VNET_DEFINE_STATIC(int, ip6_maxfragsperpacket); 130757cb678SBjoern A. Zeeb #define V_ip6_maxfragbucketsize VNET(ip6_maxfragbucketsize) 131757cb678SBjoern A. Zeeb #define V_ip6_maxfragsperpacket VNET(ip6_maxfragsperpacket) 132757cb678SBjoern A. Zeeb 133757cb678SBjoern A. Zeeb /* Per-VNET reassembly queue buckets. */ 1349cb1a47aSBjoern A. Zeeb VNET_DEFINE_STATIC(struct ip6qbucket, ip6qb[IP6REASS_NHASH]); 1359cb1a47aSBjoern A. Zeeb VNET_DEFINE_STATIC(uint32_t, ip6qb_hashseed); 1369cb1a47aSBjoern A. Zeeb #define V_ip6qb VNET(ip6qb) 1379cb1a47aSBjoern A. Zeeb #define V_ip6qb_hashseed VNET(ip6qb_hashseed) 13882cd038dSYoshinobu Inoue 1399cb1a47aSBjoern A. Zeeb #define IP6QB_LOCK(_b) mtx_lock(&V_ip6qb[(_b)].lock) 1409cb1a47aSBjoern A. Zeeb #define IP6QB_TRYLOCK(_b) mtx_trylock(&V_ip6qb[(_b)].lock) 1419cb1a47aSBjoern A. Zeeb #define IP6QB_LOCK_ASSERT(_b) mtx_assert(&V_ip6qb[(_b)].lock, MA_OWNED) 1429cb1a47aSBjoern A. Zeeb #define IP6QB_UNLOCK(_b) mtx_unlock(&V_ip6qb[(_b)].lock) 14321f08a07SBjoern A. Zeeb #define IP6QB_HEAD(_b) (&V_ip6qb[(_b)].packets) 1449888c401SHajimu UMEMOTO 14582cd038dSYoshinobu Inoue /* 1462ceeacbeSJonathan T. Looney * By default, limit the number of IP6 fragments across all reassembly 1472ceeacbeSJonathan T. Looney * queues to 1/32 of the total number of mbuf clusters. 1482ceeacbeSJonathan T. Looney * 1492ceeacbeSJonathan T. Looney * Limit the total number of reassembly queues per VNET to the 1502ceeacbeSJonathan T. Looney * IP6 fragment limit, but ensure the limit will not allow any bucket 1512ceeacbeSJonathan T. Looney * to grow above 100 items. (The bucket limit is 1522ceeacbeSJonathan T. Looney * IP_MAXFRAGPACKETS / (IPREASS_NHASH / 2), so the 50 is the correct 1532ceeacbeSJonathan T. Looney * multiplier to reach a 100-item limit.) 1542ceeacbeSJonathan T. Looney * The 100-item limit was chosen as brief testing seems to show that 1552ceeacbeSJonathan T. Looney * this produces "reasonable" performance on some subset of systems 1562ceeacbeSJonathan T. Looney * under DoS attack. 1572ceeacbeSJonathan T. Looney */ 1582ceeacbeSJonathan T. Looney #define IP6_MAXFRAGS (nmbclusters / 32) 1592ceeacbeSJonathan T. Looney #define IP6_MAXFRAGPACKETS (imin(IP6_MAXFRAGS, IP6REASS_NHASH * 50)) 1602ceeacbeSJonathan T. Looney 161757cb678SBjoern A. Zeeb 1622ceeacbeSJonathan T. Looney /* 163757cb678SBjoern A. Zeeb * Sysctls and helper function. 16482cd038dSYoshinobu Inoue */ 165757cb678SBjoern A. Zeeb SYSCTL_DECL(_net_inet6_ip6); 166757cb678SBjoern A. Zeeb 16765456706SBjoern A. Zeeb SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, frag6_nfrags, 16865456706SBjoern A. Zeeb CTLFLAG_RD, __DEVOLATILE(u_int *, &frag6_nfrags), 0, 16965456706SBjoern A. Zeeb "Global number of IPv6 fragments across all reassembly queues."); 17065456706SBjoern A. Zeeb 171757cb678SBjoern A. Zeeb static void 17209b361c7SBjoern A. Zeeb frag6_set_bucketsize(void) 1731e9f3b73SJonathan T. Looney { 1741e9f3b73SJonathan T. Looney int i; 1751e9f3b73SJonathan T. Looney 1761e9f3b73SJonathan T. Looney if ((i = V_ip6_maxfragpackets) > 0) 1771e9f3b73SJonathan T. Looney V_ip6_maxfragbucketsize = imax(i / (IP6REASS_NHASH / 2), 1); 1781e9f3b73SJonathan T. Looney } 1791e9f3b73SJonathan T. Looney 180757cb678SBjoern A. Zeeb SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGS, maxfrags, 181757cb678SBjoern A. Zeeb CTLFLAG_RW, &ip6_maxfrags, 0, 182757cb678SBjoern A. Zeeb "Maximum allowed number of outstanding IPv6 packet fragments. " 183757cb678SBjoern A. Zeeb "A value of 0 means no fragmented packets will be accepted, while a " 184757cb678SBjoern A. Zeeb "a value of -1 means no limit"); 185757cb678SBjoern A. Zeeb 186757cb678SBjoern A. Zeeb static int 187757cb678SBjoern A. Zeeb sysctl_ip6_maxfragpackets(SYSCTL_HANDLER_ARGS) 188757cb678SBjoern A. Zeeb { 189757cb678SBjoern A. Zeeb int error, val; 190757cb678SBjoern A. Zeeb 191757cb678SBjoern A. Zeeb val = V_ip6_maxfragpackets; 192757cb678SBjoern A. Zeeb error = sysctl_handle_int(oidp, &val, 0, req); 193757cb678SBjoern A. Zeeb if (error != 0 || !req->newptr) 194757cb678SBjoern A. Zeeb return (error); 195757cb678SBjoern A. Zeeb V_ip6_maxfragpackets = val; 196757cb678SBjoern A. Zeeb frag6_set_bucketsize(); 197757cb678SBjoern A. Zeeb return (0); 198757cb678SBjoern A. Zeeb } 199757cb678SBjoern A. Zeeb SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS, maxfragpackets, 200757cb678SBjoern A. Zeeb CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, NULL, 0, 201757cb678SBjoern A. Zeeb sysctl_ip6_maxfragpackets, "I", 202757cb678SBjoern A. Zeeb "Default maximum number of outstanding fragmented IPv6 packets. " 203757cb678SBjoern A. Zeeb "A value of 0 means no fragmented packets will be accepted, while a " 204757cb678SBjoern A. Zeeb "a value of -1 means no limit"); 20553707abdSBjoern A. Zeeb SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, frag6_nfragpackets, 20653707abdSBjoern A. Zeeb CTLFLAG_VNET | CTLFLAG_RD, 20753707abdSBjoern A. Zeeb __DEVOLATILE(u_int *, &VNET_NAME(frag6_nfragpackets)), 0, 20853707abdSBjoern A. Zeeb "Per-VNET number of IPv6 fragments across all reassembly queues."); 209757cb678SBjoern A. Zeeb SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGSPERPACKET, maxfragsperpacket, 210757cb678SBjoern A. Zeeb CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_maxfragsperpacket), 0, 211757cb678SBjoern A. Zeeb "Maximum allowed number of fragments per packet"); 212757cb678SBjoern A. Zeeb SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGBUCKETSIZE, maxfragbucketsize, 213757cb678SBjoern A. Zeeb CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_maxfragbucketsize), 0, 214757cb678SBjoern A. Zeeb "Maximum number of reassembly queues per hash bucket"); 215757cb678SBjoern A. Zeeb 216757cb678SBjoern A. Zeeb 217757cb678SBjoern A. Zeeb /* 218c00464a2SBjoern A. Zeeb * Remove the IPv6 fragmentation header from the mbuf. 219c00464a2SBjoern A. Zeeb */ 220c00464a2SBjoern A. Zeeb int 221c00464a2SBjoern A. Zeeb ip6_deletefraghdr(struct mbuf *m, int offset, int wait) 222c00464a2SBjoern A. Zeeb { 2235778b399SBjoern A. Zeeb struct ip6_hdr *ip6; 224c00464a2SBjoern A. Zeeb struct mbuf *t; 225c00464a2SBjoern A. Zeeb 226c00464a2SBjoern A. Zeeb /* Delete frag6 header. */ 227c00464a2SBjoern A. Zeeb if (m->m_len >= offset + sizeof(struct ip6_frag)) { 2285778b399SBjoern A. Zeeb 229c00464a2SBjoern A. Zeeb /* This is the only possible case with !PULLDOWN_TEST. */ 2305778b399SBjoern A. Zeeb ip6 = mtod(m, struct ip6_hdr *); 231c00464a2SBjoern A. Zeeb bcopy(ip6, (char *)ip6 + sizeof(struct ip6_frag), 232c00464a2SBjoern A. Zeeb offset); 233c00464a2SBjoern A. Zeeb m->m_data += sizeof(struct ip6_frag); 234c00464a2SBjoern A. Zeeb m->m_len -= sizeof(struct ip6_frag); 235c00464a2SBjoern A. Zeeb } else { 2365778b399SBjoern A. Zeeb 237c00464a2SBjoern A. Zeeb /* This comes with no copy if the boundary is on cluster. */ 238c00464a2SBjoern A. Zeeb if ((t = m_split(m, offset, wait)) == NULL) 239c00464a2SBjoern A. Zeeb return (ENOMEM); 240c00464a2SBjoern A. Zeeb m_adj(t, sizeof(struct ip6_frag)); 241c00464a2SBjoern A. Zeeb m_cat(m, t); 242c00464a2SBjoern A. Zeeb } 243c00464a2SBjoern A. Zeeb 244c00464a2SBjoern A. Zeeb m->m_flags |= M_FRAGMENTED; 245c00464a2SBjoern A. Zeeb return (0); 246c00464a2SBjoern A. Zeeb } 247c00464a2SBjoern A. Zeeb 248c00464a2SBjoern A. Zeeb /* 24923d374aaSBjoern A. Zeeb * Free a fragment reassembly header and all associated datagrams. 250757cb678SBjoern A. Zeeb */ 2514f590175SPaul Saab static void 252c00464a2SBjoern A. Zeeb frag6_freef(struct ip6q *q6, uint32_t bucket) 2534f590175SPaul Saab { 2545778b399SBjoern A. Zeeb struct ip6_hdr *ip6; 25521f08a07SBjoern A. Zeeb struct ip6asfrag *af6; 2565778b399SBjoern A. Zeeb struct mbuf *m; 2574f590175SPaul Saab 2589cb1a47aSBjoern A. Zeeb IP6QB_LOCK_ASSERT(bucket); 259c00464a2SBjoern A. Zeeb 26021f08a07SBjoern A. Zeeb while ((af6 = TAILQ_FIRST(&q6->ip6q_frags)) != NULL) { 261c00464a2SBjoern A. Zeeb 262da89a0feSBjoern A. Zeeb m = af6->ip6af_m; 26321f08a07SBjoern A. Zeeb TAILQ_REMOVE(&q6->ip6q_frags, af6, ip6af_tq); 264c00464a2SBjoern A. Zeeb 265c00464a2SBjoern A. Zeeb /* 266c00464a2SBjoern A. Zeeb * Return ICMP time exceeded error for the 1st fragment. 267c00464a2SBjoern A. Zeeb * Just free other fragments. 268c00464a2SBjoern A. Zeeb */ 269a55383e7SHans Petter Selasky if (af6->ip6af_off == 0 && m->m_pkthdr.rcvif != NULL) { 270c00464a2SBjoern A. Zeeb 27123d374aaSBjoern A. Zeeb /* Adjust pointer. */ 272c00464a2SBjoern A. Zeeb ip6 = mtod(m, struct ip6_hdr *); 273c00464a2SBjoern A. Zeeb 27423d374aaSBjoern A. Zeeb /* Restore source and destination addresses. */ 275c00464a2SBjoern A. Zeeb ip6->ip6_src = q6->ip6q_src; 276c00464a2SBjoern A. Zeeb ip6->ip6_dst = q6->ip6q_dst; 277c00464a2SBjoern A. Zeeb 278c00464a2SBjoern A. Zeeb icmp6_error(m, ICMP6_TIME_EXCEEDED, 279c00464a2SBjoern A. Zeeb ICMP6_TIME_EXCEED_REASSEMBLY, 0); 280c00464a2SBjoern A. Zeeb } else 281c00464a2SBjoern A. Zeeb m_freem(m); 28223d374aaSBjoern A. Zeeb 283c00464a2SBjoern A. Zeeb free(af6, M_FRAG6); 2842adfd64fSJonathan T. Looney } 28521f08a07SBjoern A. Zeeb 28621f08a07SBjoern A. Zeeb TAILQ_REMOVE(IP6QB_HEAD(bucket), q6, ip6q_tq); 28721f08a07SBjoern A. Zeeb V_ip6qb[bucket].count--; 288c00464a2SBjoern A. Zeeb atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 289c00464a2SBjoern A. Zeeb #ifdef MAC 290c00464a2SBjoern A. Zeeb mac_ip6q_destroy(q6); 291c00464a2SBjoern A. Zeeb #endif 292c00464a2SBjoern A. Zeeb free(q6, M_FRAG6); 293c00464a2SBjoern A. Zeeb atomic_subtract_int(&V_frag6_nfragpackets, 1); 29482cd038dSYoshinobu Inoue } 29582cd038dSYoshinobu Inoue 29682cd038dSYoshinobu Inoue /* 297a55383e7SHans Petter Selasky * Drain off all datagram fragments belonging to 298a55383e7SHans Petter Selasky * the given network interface. 299a55383e7SHans Petter Selasky */ 300a55383e7SHans Petter Selasky static void 301a55383e7SHans Petter Selasky frag6_cleanup(void *arg __unused, struct ifnet *ifp) 302a55383e7SHans Petter Selasky { 30321f08a07SBjoern A. Zeeb struct ip6qhead *head; 30421f08a07SBjoern A. Zeeb struct ip6q *q6; 305a55383e7SHans Petter Selasky struct ip6asfrag *af6; 30621f08a07SBjoern A. Zeeb uint32_t bucket; 307a55383e7SHans Petter Selasky 308a55383e7SHans Petter Selasky KASSERT(ifp != NULL, ("%s: ifp is NULL", __func__)); 309a55383e7SHans Petter Selasky 3106e6b5143SBjoern A. Zeeb CURVNET_SET_QUIET(ifp->if_vnet); 31167a10c46SBjoern A. Zeeb #ifdef VIMAGE 31267a10c46SBjoern A. Zeeb /* 31367a10c46SBjoern A. Zeeb * Skip processing if IPv6 reassembly is not initialised or 31467a10c46SBjoern A. Zeeb * torn down by frag6_destroy(). 31567a10c46SBjoern A. Zeeb */ 3166e6b5143SBjoern A. Zeeb if (!V_frag6_on) { 3176e6b5143SBjoern A. Zeeb CURVNET_RESTORE(); 31867a10c46SBjoern A. Zeeb return; 3196e6b5143SBjoern A. Zeeb } 32067a10c46SBjoern A. Zeeb #endif 32167a10c46SBjoern A. Zeeb 32221f08a07SBjoern A. Zeeb for (bucket = 0; bucket < IP6REASS_NHASH; bucket++) { 32321f08a07SBjoern A. Zeeb IP6QB_LOCK(bucket); 32421f08a07SBjoern A. Zeeb head = IP6QB_HEAD(bucket); 325a55383e7SHans Petter Selasky /* Scan fragment list. */ 32621f08a07SBjoern A. Zeeb TAILQ_FOREACH(q6, head, ip6q_tq) { 32721f08a07SBjoern A. Zeeb TAILQ_FOREACH(af6, &q6->ip6q_frags, ip6af_tq) { 328a55383e7SHans Petter Selasky 329f1664f32SBjoern A. Zeeb /* Clear no longer valid rcvif pointer. */ 330da89a0feSBjoern A. Zeeb if (af6->ip6af_m->m_pkthdr.rcvif == ifp) 331da89a0feSBjoern A. Zeeb af6->ip6af_m->m_pkthdr.rcvif = NULL; 332a55383e7SHans Petter Selasky } 333a55383e7SHans Petter Selasky } 33421f08a07SBjoern A. Zeeb IP6QB_UNLOCK(bucket); 335a55383e7SHans Petter Selasky } 336a55383e7SHans Petter Selasky CURVNET_RESTORE(); 337a55383e7SHans Petter Selasky } 338a55383e7SHans Petter Selasky EVENTHANDLER_DEFINE(ifnet_departure_event, frag6_cleanup, NULL, 0); 339a55383e7SHans Petter Selasky 340a55383e7SHans Petter Selasky /* 34123d374aaSBjoern A. Zeeb * Like in RFC2460, in RFC8200, fragment and reassembly rules do not agree with 34223d374aaSBjoern A. Zeeb * each other, in terms of next header field handling in fragment header. 343686cdd19SJun-ichiro itojun Hagino * While the sender will use the same value for all of the fragmented packets, 34423d374aaSBjoern A. Zeeb * receiver is suggested not to check for consistency. 345686cdd19SJun-ichiro itojun Hagino * 34623d374aaSBjoern A. Zeeb * Fragment rules (p18,p19): 347686cdd19SJun-ichiro itojun Hagino * (2) A Fragment header containing: 34823d374aaSBjoern A. Zeeb * The Next Header value that identifies the first header 34923d374aaSBjoern A. Zeeb * after the Per-Fragment headers of the original packet. 350686cdd19SJun-ichiro itojun Hagino * -> next header field is same for all fragments 351686cdd19SJun-ichiro itojun Hagino * 35223d374aaSBjoern A. Zeeb * Reassembly rule (p20): 35323d374aaSBjoern A. Zeeb * The Next Header field of the last header of the Per-Fragment 35423d374aaSBjoern A. Zeeb * headers is obtained from the Next Header field of the first 355686cdd19SJun-ichiro itojun Hagino * fragment's Fragment header. 356686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 357686cdd19SJun-ichiro itojun Hagino * 358686cdd19SJun-ichiro itojun Hagino * The following note also contradicts with fragment rule - no one is going to 359686cdd19SJun-ichiro itojun Hagino * send different fragment with different next header field. 360686cdd19SJun-ichiro itojun Hagino * 36123d374aaSBjoern A. Zeeb * Additional note (p22) [not an error]: 362686cdd19SJun-ichiro itojun Hagino * The Next Header values in the Fragment headers of different 363686cdd19SJun-ichiro itojun Hagino * fragments of the same original packet may differ. Only the value 364686cdd19SJun-ichiro itojun Hagino * from the Offset zero fragment packet is used for reassembly. 365686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 366686cdd19SJun-ichiro itojun Hagino * 367686cdd19SJun-ichiro itojun Hagino * There is no explicit reason given in the RFC. Historical reason maybe? 368686cdd19SJun-ichiro itojun Hagino */ 369686cdd19SJun-ichiro itojun Hagino /* 37023d374aaSBjoern A. Zeeb * Fragment input. 37182cd038dSYoshinobu Inoue */ 37282cd038dSYoshinobu Inoue int 3731272577eSXin LI frag6_input(struct mbuf **mp, int *offp, int proto) 37482cd038dSYoshinobu Inoue { 37521f08a07SBjoern A. Zeeb struct mbuf *m, *t; 37682cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 37782cd038dSYoshinobu Inoue struct ip6_frag *ip6f; 37821f08a07SBjoern A. Zeeb struct ip6qhead *head; 37921f08a07SBjoern A. Zeeb struct ip6q *q6; 38021f08a07SBjoern A. Zeeb struct ip6asfrag *af6, *ip6af, *af6tmp; 38121f08a07SBjoern A. Zeeb struct in6_ifaddr *ia6; 38221f08a07SBjoern A. Zeeb struct ifnet *dstifp, *srcifp; 383505e91f5SKristof Provost uint32_t hashkey[(sizeof(struct in6_addr) * 2 + 384505e91f5SKristof Provost sizeof(ip6f->ip6f_ident)) / sizeof(uint32_t)]; 3859cb1a47aSBjoern A. Zeeb uint32_t bucket, *hashkeyp; 3865778b399SBjoern A. Zeeb int fragoff, frgpartlen; /* Must be larger than uint16_t. */ 3875778b399SBjoern A. Zeeb int nxt, offset, plen; 3885778b399SBjoern A. Zeeb uint8_t ecn, ecn0; 3895778b399SBjoern A. Zeeb bool only_frag; 390aaa46574SAdrian Chadd #ifdef RSS 391aaa46574SAdrian Chadd struct ip6_direct_ctx *ip6dc; 3925778b399SBjoern A. Zeeb struct m_tag *mtag; 393aaa46574SAdrian Chadd #endif 394aaa46574SAdrian Chadd 3955778b399SBjoern A. Zeeb m = *mp; 3965778b399SBjoern A. Zeeb offset = *offp; 3975778b399SBjoern A. Zeeb 398c1131de6SBjoern A. Zeeb M_ASSERTPKTHDR(m); 399c1131de6SBjoern A. Zeeb 40082cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 401686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 402686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), IPPROTO_DONE); 40382cd038dSYoshinobu Inoue ip6f = (struct ip6_frag *)((caddr_t)ip6 + offset); 404686cdd19SJun-ichiro itojun Hagino #else 405686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(ip6f, struct ip6_frag *, m, offset, sizeof(*ip6f)); 406686cdd19SJun-ichiro itojun Hagino if (ip6f == NULL) 40740e39bbbSHajimu UMEMOTO return (IPPROTO_DONE); 408686cdd19SJun-ichiro itojun Hagino #endif 40982cd038dSYoshinobu Inoue 41082cd038dSYoshinobu Inoue dstifp = NULL; 41123d374aaSBjoern A. Zeeb /* Find the destination interface of the packet. */ 4125778b399SBjoern A. Zeeb ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 4135778b399SBjoern A. Zeeb if (ia6 != NULL) { 4145778b399SBjoern A. Zeeb dstifp = ia6->ia_ifp; 4155778b399SBjoern A. Zeeb ifa_free(&ia6->ia_ifa); 4168c0fec80SRobert Watson } 41723d374aaSBjoern A. Zeeb 41823d374aaSBjoern A. Zeeb /* Jumbo payload cannot contain a fragment header. */ 41982cd038dSYoshinobu Inoue if (ip6->ip6_plen == 0) { 42082cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, offset); 42182cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 4225778b399SBjoern A. Zeeb return (IPPROTO_DONE); 42382cd038dSYoshinobu Inoue } 42482cd038dSYoshinobu Inoue 42582cd038dSYoshinobu Inoue /* 42623d374aaSBjoern A. Zeeb * Check whether fragment packet's fragment length is a 42723d374aaSBjoern A. Zeeb * multiple of 8 octets (unless it is the last one). 42882cd038dSYoshinobu Inoue * sizeof(struct ip6_frag) == 8 42982cd038dSYoshinobu Inoue * sizeof(struct ip6_hdr) = 40 43082cd038dSYoshinobu Inoue */ 43182cd038dSYoshinobu Inoue if ((ip6f->ip6f_offlg & IP6F_MORE_FRAG) && 43282cd038dSYoshinobu Inoue (((ntohs(ip6->ip6_plen) - offset) & 0x7) != 0)) { 43306cd0a3fSHajimu UMEMOTO icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 434686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_hdr, ip6_plen)); 43582cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 4365778b399SBjoern A. Zeeb return (IPPROTO_DONE); 43782cd038dSYoshinobu Inoue } 43882cd038dSYoshinobu Inoue 4399cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragments); 44082cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_reqd); 44182cd038dSYoshinobu Inoue 4424018ea9aSBjoern A. Zeeb /* 4432946a941STom Jones * Handle "atomic" fragments (offset and m bit set to 0) upfront, 444c1131de6SBjoern A. Zeeb * unrelated to any reassembly. We need to remove the frag hdr 445c1131de6SBjoern A. Zeeb * which is ugly. 44623d374aaSBjoern A. Zeeb * See RFC 6946 and section 4.5 of RFC 8200. 4474018ea9aSBjoern A. Zeeb */ 4484018ea9aSBjoern A. Zeeb if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) { 4492946a941STom Jones IP6STAT_INC(ip6s_atomicfrags); 450c1131de6SBjoern A. Zeeb nxt = ip6f->ip6f_nxt; 451c1131de6SBjoern A. Zeeb /* 452c1131de6SBjoern A. Zeeb * Set nxt(-hdr field value) to the original value. 453c1131de6SBjoern A. Zeeb * We cannot just set ip6->ip6_nxt as there might be 454c1131de6SBjoern A. Zeeb * an unfragmentable part with extension headers and 455c1131de6SBjoern A. Zeeb * we must update the last one. 456c1131de6SBjoern A. Zeeb */ 457c1131de6SBjoern A. Zeeb m_copyback(m, ip6_get_prevhdr(m, offset), sizeof(uint8_t), 458c1131de6SBjoern A. Zeeb (caddr_t)&nxt); 459c1131de6SBjoern A. Zeeb ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - 460c1131de6SBjoern A. Zeeb sizeof(struct ip6_frag)); 461c1131de6SBjoern A. Zeeb if (ip6_deletefraghdr(m, offset, M_NOWAIT) != 0) 462c1131de6SBjoern A. Zeeb goto dropfrag2; 463c1131de6SBjoern A. Zeeb m->m_pkthdr.len -= sizeof(struct ip6_frag); 4644018ea9aSBjoern A. Zeeb in6_ifstat_inc(dstifp, ifs6_reass_ok); 465c1131de6SBjoern A. Zeeb *mp = m; 466c1131de6SBjoern A. Zeeb return (nxt); 4674018ea9aSBjoern A. Zeeb } 4684018ea9aSBjoern A. Zeeb 469c1131de6SBjoern A. Zeeb /* Offset now points to data portion. */ 470c1131de6SBjoern A. Zeeb offset += sizeof(struct ip6_frag); 471c1131de6SBjoern A. Zeeb 4725f9f192dSJonathan T. Looney /* Get fragment length and discard 0-byte fragments. */ 4735f9f192dSJonathan T. Looney frgpartlen = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - offset; 4745f9f192dSJonathan T. Looney if (frgpartlen == 0) { 4755f9f192dSJonathan T. Looney icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 4765f9f192dSJonathan T. Looney offsetof(struct ip6_hdr, ip6_plen)); 4775f9f192dSJonathan T. Looney in6_ifstat_inc(dstifp, ifs6_reass_fail); 4785f9f192dSJonathan T. Looney IP6STAT_INC(ip6s_fragdropped); 4795778b399SBjoern A. Zeeb return (IPPROTO_DONE); 4805f9f192dSJonathan T. Looney } 4815f9f192dSJonathan T. Looney 4827715d794SBjoern A. Zeeb /* 4837715d794SBjoern A. Zeeb * Enforce upper bound on number of fragments for the entire system. 4847715d794SBjoern A. Zeeb * If maxfrag is 0, never accept fragments. 4857715d794SBjoern A. Zeeb * If maxfrag is -1, accept all fragments without limitation. 4867715d794SBjoern A. Zeeb */ 4877715d794SBjoern A. Zeeb if (ip6_maxfrags < 0) 4887715d794SBjoern A. Zeeb ; 4897715d794SBjoern A. Zeeb else if (atomic_load_int(&frag6_nfrags) >= (u_int)ip6_maxfrags) 4907715d794SBjoern A. Zeeb goto dropfrag2; 4917715d794SBjoern A. Zeeb 49230809ba9SBjoern A. Zeeb /* 49330809ba9SBjoern A. Zeeb * Validate that a full header chain to the ULP is present in the 49430809ba9SBjoern A. Zeeb * packet containing the first fragment as per RFC RFC7112 and 49530809ba9SBjoern A. Zeeb * RFC 8200 pages 18,19: 49630809ba9SBjoern A. Zeeb * The first fragment packet is composed of: 49730809ba9SBjoern A. Zeeb * (3) Extension headers, if any, and the Upper-Layer header. These 49830809ba9SBjoern A. Zeeb * headers must be in the first fragment. ... 49930809ba9SBjoern A. Zeeb */ 50030809ba9SBjoern A. Zeeb fragoff = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK); 50130809ba9SBjoern A. Zeeb /* XXX TODO. thj has D16851 open for this. */ 50230809ba9SBjoern A. Zeeb /* Send ICMPv6 4,3 in case of violation. */ 50330809ba9SBjoern A. Zeeb 504efdfee93SBjoern A. Zeeb /* Store receive network interface pointer for later. */ 505efdfee93SBjoern A. Zeeb srcifp = m->m_pkthdr.rcvif; 506efdfee93SBjoern A. Zeeb 50723d374aaSBjoern A. Zeeb /* Generate a hash value for fragment bucket selection. */ 50880d7a853SJonathan T. Looney hashkeyp = hashkey; 50980d7a853SJonathan T. Looney memcpy(hashkeyp, &ip6->ip6_src, sizeof(struct in6_addr)); 51080d7a853SJonathan T. Looney hashkeyp += sizeof(struct in6_addr) / sizeof(*hashkeyp); 51180d7a853SJonathan T. Looney memcpy(hashkeyp, &ip6->ip6_dst, sizeof(struct in6_addr)); 51280d7a853SJonathan T. Looney hashkeyp += sizeof(struct in6_addr) / sizeof(*hashkeyp); 51380d7a853SJonathan T. Looney *hashkeyp = ip6f->ip6f_ident; 5149cb1a47aSBjoern A. Zeeb bucket = jenkins_hash32(hashkey, nitems(hashkey), V_ip6qb_hashseed); 5159cb1a47aSBjoern A. Zeeb bucket &= IP6REASS_HMASK; 5169cb1a47aSBjoern A. Zeeb IP6QB_LOCK(bucket); 51721f08a07SBjoern A. Zeeb head = IP6QB_HEAD(bucket); 5189888c401SHajimu UMEMOTO 51921f08a07SBjoern A. Zeeb TAILQ_FOREACH(q6, head, ip6q_tq) 52082cd038dSYoshinobu Inoue if (ip6f->ip6f_ident == q6->ip6q_ident && 52182cd038dSYoshinobu Inoue IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &q6->ip6q_src) && 5224b908c8bSRobert Watson IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &q6->ip6q_dst) 5234b908c8bSRobert Watson #ifdef MAC 5244b908c8bSRobert Watson && mac_ip6q_match(m, q6) 5254b908c8bSRobert Watson #endif 5264b908c8bSRobert Watson ) 52782cd038dSYoshinobu Inoue break; 52882cd038dSYoshinobu Inoue 5295778b399SBjoern A. Zeeb only_frag = false; 53021f08a07SBjoern A. Zeeb if (q6 == NULL) { 53123d374aaSBjoern A. Zeeb 5325778b399SBjoern A. Zeeb /* A first fragment to arrive creates a reassembly queue. */ 5335778b399SBjoern A. Zeeb only_frag = true; 53482cd038dSYoshinobu Inoue 53582cd038dSYoshinobu Inoue /* 53682cd038dSYoshinobu Inoue * Enforce upper bound on number of fragmented packets 53782cd038dSYoshinobu Inoue * for which we attempt reassembly; 5389888c401SHajimu UMEMOTO * If maxfragpackets is 0, never accept fragments. 5399888c401SHajimu UMEMOTO * If maxfragpackets is -1, accept all fragments without 5409888c401SHajimu UMEMOTO * limitation. 54182cd038dSYoshinobu Inoue */ 542603724d3SBjoern A. Zeeb if (V_ip6_maxfragpackets < 0) 54333841545SHajimu UMEMOTO ; 5449cb1a47aSBjoern A. Zeeb else if (V_ip6qb[bucket].count >= V_ip6_maxfragbucketsize || 5451e9f3b73SJonathan T. Looney atomic_load_int(&V_frag6_nfragpackets) >= 54680d7a853SJonathan T. Looney (u_int)V_ip6_maxfragpackets) 54733841545SHajimu UMEMOTO goto dropfrag; 54823d374aaSBjoern A. Zeeb 54923d374aaSBjoern A. Zeeb /* Allocate IPv6 fragement packet queue entry. */ 550487a161cSBjoern A. Zeeb q6 = (struct ip6q *)malloc(sizeof(struct ip6q), M_FRAG6, 551487a161cSBjoern A. Zeeb M_NOWAIT | M_ZERO); 55282cd038dSYoshinobu Inoue if (q6 == NULL) 55382cd038dSYoshinobu Inoue goto dropfrag; 5544b908c8bSRobert Watson #ifdef MAC 5554b908c8bSRobert Watson if (mac_ip6q_init(q6, M_NOWAIT) != 0) { 556487a161cSBjoern A. Zeeb free(q6, M_FRAG6); 5574b908c8bSRobert Watson goto dropfrag; 5584b908c8bSRobert Watson } 5594b908c8bSRobert Watson mac_ip6q_create(m, q6); 5604b908c8bSRobert Watson #endif 561702828f6SBjoern A. Zeeb atomic_add_int(&V_frag6_nfragpackets, 1); 56282cd038dSYoshinobu Inoue 56323d374aaSBjoern A. Zeeb /* ip6q_nxt will be filled afterwards, from 1st fragment. */ 56421f08a07SBjoern A. Zeeb TAILQ_INIT(&q6->ip6q_frags); 56582cd038dSYoshinobu Inoue q6->ip6q_ident = ip6f->ip6f_ident; 56682cd038dSYoshinobu Inoue q6->ip6q_ttl = IPV6_FRAGTTL; 56782cd038dSYoshinobu Inoue q6->ip6q_src = ip6->ip6_src; 56882cd038dSYoshinobu Inoue q6->ip6q_dst = ip6->ip6_dst; 5695e9510e3SJINMEI Tatuya q6->ip6q_ecn = 5705e9510e3SJINMEI Tatuya (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 57182cd038dSYoshinobu Inoue q6->ip6q_unfrglen = -1; /* The 1st fragment has not arrived. */ 5729888c401SHajimu UMEMOTO 57321f08a07SBjoern A. Zeeb /* Add the fragemented packet to the bucket. */ 57421f08a07SBjoern A. Zeeb TAILQ_INSERT_HEAD(head, q6, ip6q_tq); 57521f08a07SBjoern A. Zeeb V_ip6qb[bucket].count++; 57682cd038dSYoshinobu Inoue } 57782cd038dSYoshinobu Inoue 57882cd038dSYoshinobu Inoue /* 57923d374aaSBjoern A. Zeeb * If it is the 1st fragment, record the length of the 58082cd038dSYoshinobu Inoue * unfragmentable part and the next header of the fragment header. 581619456bbSBjoern A. Zeeb * Assume the first 1st fragement to arrive will be correct. 582619456bbSBjoern A. Zeeb * We do not have any duplicate checks here yet so another packet 583619456bbSBjoern A. Zeeb * with fragoff == 0 could come and overwrite the ip6q_unfrglen 584619456bbSBjoern A. Zeeb * and worse, the next header, at any time. 58582cd038dSYoshinobu Inoue */ 586619456bbSBjoern A. Zeeb if (fragoff == 0 && q6->ip6q_unfrglen == -1) { 58706cd0a3fSHajimu UMEMOTO q6->ip6q_unfrglen = offset - sizeof(struct ip6_hdr) - 58806cd0a3fSHajimu UMEMOTO sizeof(struct ip6_frag); 58982cd038dSYoshinobu Inoue q6->ip6q_nxt = ip6f->ip6f_nxt; 590619456bbSBjoern A. Zeeb /* XXX ECN? */ 59182cd038dSYoshinobu Inoue } 59282cd038dSYoshinobu Inoue 59382cd038dSYoshinobu Inoue /* 59482cd038dSYoshinobu Inoue * Check that the reassembled packet would not exceed 65535 bytes 59582cd038dSYoshinobu Inoue * in size. 59682cd038dSYoshinobu Inoue * If it would exceed, discard the fragment and return an ICMP error. 59782cd038dSYoshinobu Inoue */ 59882cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen >= 0) { 59982cd038dSYoshinobu Inoue /* The 1st fragment has already arrived. */ 60082cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + fragoff + frgpartlen > IPV6_MAXPACKET) { 601e5fffe9aSBjoern A. Zeeb if (only_frag) { 602e5fffe9aSBjoern A. Zeeb TAILQ_REMOVE(head, q6, ip6q_tq); 603e5fffe9aSBjoern A. Zeeb V_ip6qb[bucket].count--; 604e5fffe9aSBjoern A. Zeeb atomic_subtract_int(&V_frag6_nfragpackets, 1); 605e5fffe9aSBjoern A. Zeeb #ifdef MAC 606e5fffe9aSBjoern A. Zeeb mac_ip6q_destroy(q6); 607e5fffe9aSBjoern A. Zeeb #endif 608e5fffe9aSBjoern A. Zeeb free(q6, M_FRAG6); 609e5fffe9aSBjoern A. Zeeb } 610e5fffe9aSBjoern A. Zeeb IP6QB_UNLOCK(bucket); 61182cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 612686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 613686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 61482cd038dSYoshinobu Inoue return (IPPROTO_DONE); 61582cd038dSYoshinobu Inoue } 61606cd0a3fSHajimu UMEMOTO } else if (fragoff + frgpartlen > IPV6_MAXPACKET) { 617e5fffe9aSBjoern A. Zeeb if (only_frag) { 618e5fffe9aSBjoern A. Zeeb TAILQ_REMOVE(head, q6, ip6q_tq); 619e5fffe9aSBjoern A. Zeeb V_ip6qb[bucket].count--; 620e5fffe9aSBjoern A. Zeeb atomic_subtract_int(&V_frag6_nfragpackets, 1); 621e5fffe9aSBjoern A. Zeeb #ifdef MAC 622e5fffe9aSBjoern A. Zeeb mac_ip6q_destroy(q6); 623e5fffe9aSBjoern A. Zeeb #endif 624e5fffe9aSBjoern A. Zeeb free(q6, M_FRAG6); 625e5fffe9aSBjoern A. Zeeb } 626e5fffe9aSBjoern A. Zeeb IP6QB_UNLOCK(bucket); 62782cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 628686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 629686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 63082cd038dSYoshinobu Inoue return (IPPROTO_DONE); 63182cd038dSYoshinobu Inoue } 632f1664f32SBjoern A. Zeeb 63382cd038dSYoshinobu Inoue /* 63423d374aaSBjoern A. Zeeb * If it is the first fragment, do the above check for each 63582cd038dSYoshinobu Inoue * fragment already stored in the reassembly queue. 63682cd038dSYoshinobu Inoue */ 637dda02192SBjoern A. Zeeb if (fragoff == 0 && !only_frag) { 63821f08a07SBjoern A. Zeeb TAILQ_FOREACH_SAFE(af6, &q6->ip6q_frags, ip6af_tq, af6tmp) { 63982cd038dSYoshinobu Inoue 640dda02192SBjoern A. Zeeb if (q6->ip6q_unfrglen + af6->ip6af_off + 641dda02192SBjoern A. Zeeb af6->ip6af_frglen > IPV6_MAXPACKET) { 64282cd038dSYoshinobu Inoue struct ip6_hdr *ip6err; 6435778b399SBjoern A. Zeeb struct mbuf *merr; 6445778b399SBjoern A. Zeeb int erroff; 6455778b399SBjoern A. Zeeb 646da89a0feSBjoern A. Zeeb merr = af6->ip6af_m; 6475778b399SBjoern A. Zeeb erroff = af6->ip6af_offset; 64882cd038dSYoshinobu Inoue 64923d374aaSBjoern A. Zeeb /* Dequeue the fragment. */ 65021f08a07SBjoern A. Zeeb TAILQ_REMOVE(&q6->ip6q_frags, af6, ip6af_tq); 651dda02192SBjoern A. Zeeb q6->ip6q_nfrag--; 652dda02192SBjoern A. Zeeb atomic_subtract_int(&frag6_nfrags, 1); 653487a161cSBjoern A. Zeeb free(af6, M_FRAG6); 65482cd038dSYoshinobu Inoue 655a55383e7SHans Petter Selasky /* Set a valid receive interface pointer. */ 656a55383e7SHans Petter Selasky merr->m_pkthdr.rcvif = srcifp; 657a55383e7SHans Petter Selasky 65823d374aaSBjoern A. Zeeb /* Adjust pointer. */ 65982cd038dSYoshinobu Inoue ip6err = mtod(merr, struct ip6_hdr *); 66082cd038dSYoshinobu Inoue 66182cd038dSYoshinobu Inoue /* 66282cd038dSYoshinobu Inoue * Restore source and destination addresses 66382cd038dSYoshinobu Inoue * in the erroneous IPv6 header. 66482cd038dSYoshinobu Inoue */ 66582cd038dSYoshinobu Inoue ip6err->ip6_src = q6->ip6q_src; 66682cd038dSYoshinobu Inoue ip6err->ip6_dst = q6->ip6q_dst; 66782cd038dSYoshinobu Inoue 66882cd038dSYoshinobu Inoue icmp6_error(merr, ICMP6_PARAM_PROB, 66982cd038dSYoshinobu Inoue ICMP6_PARAMPROB_HEADER, 670686cdd19SJun-ichiro itojun Hagino erroff - sizeof(struct ip6_frag) + 671686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 67282cd038dSYoshinobu Inoue } 67382cd038dSYoshinobu Inoue } 67482cd038dSYoshinobu Inoue } 67582cd038dSYoshinobu Inoue 67623d374aaSBjoern A. Zeeb /* Allocate an IPv6 fragement queue entry for this fragmented part. */ 677487a161cSBjoern A. Zeeb ip6af = (struct ip6asfrag *)malloc(sizeof(struct ip6asfrag), M_FRAG6, 678487a161cSBjoern A. Zeeb M_NOWAIT | M_ZERO); 679686cdd19SJun-ichiro itojun Hagino if (ip6af == NULL) 680686cdd19SJun-ichiro itojun Hagino goto dropfrag; 68121f08a07SBjoern A. Zeeb ip6af->ip6af_mff = (ip6f->ip6f_offlg & IP6F_MORE_FRAG) ? true : false; 68282cd038dSYoshinobu Inoue ip6af->ip6af_off = fragoff; 68382cd038dSYoshinobu Inoue ip6af->ip6af_frglen = frgpartlen; 68482cd038dSYoshinobu Inoue ip6af->ip6af_offset = offset; 685da89a0feSBjoern A. Zeeb ip6af->ip6af_m = m; 68682cd038dSYoshinobu Inoue 6875778b399SBjoern A. Zeeb if (only_frag) { 68821f08a07SBjoern A. Zeeb /* 68921f08a07SBjoern A. Zeeb * Do a manual insert rather than a hard-to-understand cast 69021f08a07SBjoern A. Zeeb * to a different type relying on data structure order to work. 69121f08a07SBjoern A. Zeeb */ 69221f08a07SBjoern A. Zeeb TAILQ_INSERT_HEAD(&q6->ip6q_frags, ip6af, ip6af_tq); 69321f08a07SBjoern A. Zeeb goto postinsert; 69482cd038dSYoshinobu Inoue } 69582cd038dSYoshinobu Inoue 69623d374aaSBjoern A. Zeeb /* Do duplicate, condition, and boundry checks. */ 69782cd038dSYoshinobu Inoue /* 69859dfcba4SHajimu UMEMOTO * Handle ECN by comparing this segment with the first one; 69959dfcba4SHajimu UMEMOTO * if CE is set, do not lose CE. 70023d374aaSBjoern A. Zeeb * Drop if CE and not-ECT are mixed for the same packet. 70159dfcba4SHajimu UMEMOTO */ 70259dfcba4SHajimu UMEMOTO ecn = (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 7035e9510e3SJINMEI Tatuya ecn0 = q6->ip6q_ecn; 70459dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_CE) { 70559dfcba4SHajimu UMEMOTO if (ecn0 == IPTOS_ECN_NOTECT) { 706487a161cSBjoern A. Zeeb free(ip6af, M_FRAG6); 70759dfcba4SHajimu UMEMOTO goto dropfrag; 70859dfcba4SHajimu UMEMOTO } 70959dfcba4SHajimu UMEMOTO if (ecn0 != IPTOS_ECN_CE) 7105e9510e3SJINMEI Tatuya q6->ip6q_ecn = IPTOS_ECN_CE; 71159dfcba4SHajimu UMEMOTO } 71259dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT) { 713487a161cSBjoern A. Zeeb free(ip6af, M_FRAG6); 71459dfcba4SHajimu UMEMOTO goto dropfrag; 71559dfcba4SHajimu UMEMOTO } 71659dfcba4SHajimu UMEMOTO 71723d374aaSBjoern A. Zeeb /* Find a fragmented part which begins after this one does. */ 71821f08a07SBjoern A. Zeeb TAILQ_FOREACH(af6, &q6->ip6q_frags, ip6af_tq) 71982cd038dSYoshinobu Inoue if (af6->ip6af_off > ip6af->ip6af_off) 72082cd038dSYoshinobu Inoue break; 72182cd038dSYoshinobu Inoue 72282cd038dSYoshinobu Inoue /* 72382cd038dSYoshinobu Inoue * If the incoming framgent overlaps some existing fragments in 72423d374aaSBjoern A. Zeeb * the reassembly queue, drop both the new fragment and the 72523d374aaSBjoern A. Zeeb * entire reassembly queue. However, if the new fragment 72623d374aaSBjoern A. Zeeb * is an exact duplicate of an existing fragment, only silently 72723d374aaSBjoern A. Zeeb * drop the existing fragment and leave the fragmentation queue 72823d374aaSBjoern A. Zeeb * unchanged, as allowed by the RFC. (RFC 8200, 4.5) 72982cd038dSYoshinobu Inoue */ 73021f08a07SBjoern A. Zeeb if (af6 != NULL) 73121f08a07SBjoern A. Zeeb af6tmp = TAILQ_PREV(af6, ip6fraghead, ip6af_tq); 73221f08a07SBjoern A. Zeeb else 73321f08a07SBjoern A. Zeeb af6tmp = TAILQ_LAST(&q6->ip6q_frags, ip6fraghead); 73421f08a07SBjoern A. Zeeb if (af6tmp != NULL) { 73521f08a07SBjoern A. Zeeb if (af6tmp->ip6af_off + af6tmp->ip6af_frglen - 7365778b399SBjoern A. Zeeb ip6af->ip6af_off > 0) { 737cd188da2SBjoern A. Zeeb if (af6tmp->ip6af_off != ip6af->ip6af_off || 738cd188da2SBjoern A. Zeeb af6tmp->ip6af_frglen != ip6af->ip6af_frglen) 739cd188da2SBjoern A. Zeeb frag6_freef(q6, bucket); 740487a161cSBjoern A. Zeeb free(ip6af, M_FRAG6); 74182cd038dSYoshinobu Inoue goto dropfrag; 74282cd038dSYoshinobu Inoue } 74382cd038dSYoshinobu Inoue } 74421f08a07SBjoern A. Zeeb if (af6 != NULL) { 7455778b399SBjoern A. Zeeb if (ip6af->ip6af_off + ip6af->ip6af_frglen - 7465778b399SBjoern A. Zeeb af6->ip6af_off > 0) { 747cd188da2SBjoern A. Zeeb if (af6->ip6af_off != ip6af->ip6af_off || 748cd188da2SBjoern A. Zeeb af6->ip6af_frglen != ip6af->ip6af_frglen) 749cd188da2SBjoern A. Zeeb frag6_freef(q6, bucket); 750487a161cSBjoern A. Zeeb free(ip6af, M_FRAG6); 75182cd038dSYoshinobu Inoue goto dropfrag; 75282cd038dSYoshinobu Inoue } 75382cd038dSYoshinobu Inoue } 75482cd038dSYoshinobu Inoue 7554b908c8bSRobert Watson #ifdef MAC 7564b908c8bSRobert Watson mac_ip6q_update(m, q6); 7574b908c8bSRobert Watson #endif 75882cd038dSYoshinobu Inoue 75982cd038dSYoshinobu Inoue /* 76023d374aaSBjoern A. Zeeb * Stick new segment in its place; check for complete reassembly. 76123d374aaSBjoern A. Zeeb * If not complete, check fragment limit. Move to front of packet 76223d374aaSBjoern A. Zeeb * queue, as we are the most recently active fragmented packet. 76382cd038dSYoshinobu Inoue */ 76421f08a07SBjoern A. Zeeb if (af6 != NULL) 76521f08a07SBjoern A. Zeeb TAILQ_INSERT_BEFORE(af6, ip6af, ip6af_tq); 76621f08a07SBjoern A. Zeeb else 76721f08a07SBjoern A. Zeeb TAILQ_INSERT_TAIL(&q6->ip6q_frags, ip6af, ip6af_tq); 76821f08a07SBjoern A. Zeeb postinsert: 7692adfd64fSJonathan T. Looney atomic_add_int(&frag6_nfrags, 1); 7709888c401SHajimu UMEMOTO q6->ip6q_nfrag++; 7713c7165b3SBjoern A. Zeeb 7725778b399SBjoern A. Zeeb plen = 0; 77321f08a07SBjoern A. Zeeb TAILQ_FOREACH(af6, &q6->ip6q_frags, ip6af_tq) { 7745778b399SBjoern A. Zeeb if (af6->ip6af_off != plen) { 77503c99d76SJonathan T. Looney if (q6->ip6q_nfrag > V_ip6_maxfragsperpacket) { 776198fdaedSTom Jones IP6STAT_ADD(ip6s_fragdropped, q6->ip6q_nfrag); 7779cb1a47aSBjoern A. Zeeb frag6_freef(q6, bucket); 77803c99d76SJonathan T. Looney } 7799cb1a47aSBjoern A. Zeeb IP6QB_UNLOCK(bucket); 7805778b399SBjoern A. Zeeb return (IPPROTO_DONE); 78182cd038dSYoshinobu Inoue } 7825778b399SBjoern A. Zeeb plen += af6->ip6af_frglen; 78382cd038dSYoshinobu Inoue } 78421f08a07SBjoern A. Zeeb af6 = TAILQ_LAST(&q6->ip6q_frags, ip6fraghead); 78521f08a07SBjoern A. Zeeb if (af6->ip6af_mff) { 78603c99d76SJonathan T. Looney if (q6->ip6q_nfrag > V_ip6_maxfragsperpacket) { 787198fdaedSTom Jones IP6STAT_ADD(ip6s_fragdropped, q6->ip6q_nfrag); 7889cb1a47aSBjoern A. Zeeb frag6_freef(q6, bucket); 78903c99d76SJonathan T. Looney } 7909cb1a47aSBjoern A. Zeeb IP6QB_UNLOCK(bucket); 7915778b399SBjoern A. Zeeb return (IPPROTO_DONE); 79282cd038dSYoshinobu Inoue } 79382cd038dSYoshinobu Inoue 79423d374aaSBjoern A. Zeeb /* Reassembly is complete; concatenate fragments. */ 79521f08a07SBjoern A. Zeeb ip6af = TAILQ_FIRST(&q6->ip6q_frags); 796da89a0feSBjoern A. Zeeb t = m = ip6af->ip6af_m; 79721f08a07SBjoern A. Zeeb TAILQ_REMOVE(&q6->ip6q_frags, ip6af, ip6af_tq); 79821f08a07SBjoern A. Zeeb while ((af6 = TAILQ_FIRST(&q6->ip6q_frags)) != NULL) { 7999907aba3SAndrey V. Elsukov m->m_pkthdr.csum_flags &= 800da89a0feSBjoern A. Zeeb af6->ip6af_m->m_pkthdr.csum_flags; 8019907aba3SAndrey V. Elsukov m->m_pkthdr.csum_data += 802da89a0feSBjoern A. Zeeb af6->ip6af_m->m_pkthdr.csum_data; 8039907aba3SAndrey V. Elsukov 80421f08a07SBjoern A. Zeeb TAILQ_REMOVE(&q6->ip6q_frags, af6, ip6af_tq); 805efdfee93SBjoern A. Zeeb t = m_last(t); 806da89a0feSBjoern A. Zeeb m_adj(af6->ip6af_m, af6->ip6af_offset); 807da89a0feSBjoern A. Zeeb m_demote_pkthdr(af6->ip6af_m); 808da89a0feSBjoern A. Zeeb m_cat(t, af6->ip6af_m); 809487a161cSBjoern A. Zeeb free(af6, M_FRAG6); 81082cd038dSYoshinobu Inoue } 81182cd038dSYoshinobu Inoue 8129907aba3SAndrey V. Elsukov while (m->m_pkthdr.csum_data & 0xffff0000) 8139907aba3SAndrey V. Elsukov m->m_pkthdr.csum_data = (m->m_pkthdr.csum_data & 0xffff) + 8149907aba3SAndrey V. Elsukov (m->m_pkthdr.csum_data >> 16); 8159907aba3SAndrey V. Elsukov 81623d374aaSBjoern A. Zeeb /* Adjust offset to point where the original next header starts. */ 81782cd038dSYoshinobu Inoue offset = ip6af->ip6af_offset - sizeof(struct ip6_frag); 818487a161cSBjoern A. Zeeb free(ip6af, M_FRAG6); 819686cdd19SJun-ichiro itojun Hagino ip6 = mtod(m, struct ip6_hdr *); 8205778b399SBjoern A. Zeeb ip6->ip6_plen = htons((u_short)plen + offset - sizeof(struct ip6_hdr)); 8215e9510e3SJINMEI Tatuya if (q6->ip6q_ecn == IPTOS_ECN_CE) 8225e9510e3SJINMEI Tatuya ip6->ip6_flow |= htonl(IPTOS_ECN_CE << 20); 82382cd038dSYoshinobu Inoue nxt = q6->ip6q_nxt; 82482cd038dSYoshinobu Inoue 82521f08a07SBjoern A. Zeeb TAILQ_REMOVE(head, q6, ip6q_tq); 82621f08a07SBjoern A. Zeeb V_ip6qb[bucket].count--; 8272adfd64fSJonathan T. Looney atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag); 82821f08a07SBjoern A. Zeeb 82921f08a07SBjoern A. Zeeb if (ip6_deletefraghdr(m, offset, M_NOWAIT) != 0) { 8304b908c8bSRobert Watson #ifdef MAC 8314b908c8bSRobert Watson mac_ip6q_destroy(q6); 8324b908c8bSRobert Watson #endif 833487a161cSBjoern A. Zeeb free(q6, M_FRAG6); 83480d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 8350b438b0fSGleb Smirnoff 836686cdd19SJun-ichiro itojun Hagino goto dropfrag; 83782cd038dSYoshinobu Inoue } 83882cd038dSYoshinobu Inoue 83923d374aaSBjoern A. Zeeb /* Set nxt(-hdr field value) to the original value. */ 84068e0e5a6SAndrey V. Elsukov m_copyback(m, ip6_get_prevhdr(m, offset), sizeof(uint8_t), 84168e0e5a6SAndrey V. Elsukov (caddr_t)&nxt); 84282cd038dSYoshinobu Inoue 8434b908c8bSRobert Watson #ifdef MAC 8444b908c8bSRobert Watson mac_ip6q_reassemble(q6, m); 8454b908c8bSRobert Watson mac_ip6q_destroy(q6); 8464b908c8bSRobert Watson #endif 847487a161cSBjoern A. Zeeb free(q6, M_FRAG6); 84880d7a853SJonathan T. Looney atomic_subtract_int(&V_frag6_nfragpackets, 1); 84982cd038dSYoshinobu Inoue 85082cd038dSYoshinobu Inoue if (m->m_flags & M_PKTHDR) { /* Isn't it always true? */ 8515778b399SBjoern A. Zeeb 8525778b399SBjoern A. Zeeb plen = 0; 85382cd038dSYoshinobu Inoue for (t = m; t; t = t->m_next) 85482cd038dSYoshinobu Inoue plen += t->m_len; 85582cd038dSYoshinobu Inoue m->m_pkthdr.len = plen; 856a55383e7SHans Petter Selasky /* Set a valid receive interface pointer. */ 857a55383e7SHans Petter Selasky m->m_pkthdr.rcvif = srcifp; 85882cd038dSYoshinobu Inoue } 85982cd038dSYoshinobu Inoue 860aaa46574SAdrian Chadd #ifdef RSS 861aaa46574SAdrian Chadd mtag = m_tag_alloc(MTAG_ABI_IPV6, IPV6_TAG_DIRECT, sizeof(*ip6dc), 862aaa46574SAdrian Chadd M_NOWAIT); 863aaa46574SAdrian Chadd if (mtag == NULL) 864aaa46574SAdrian Chadd goto dropfrag; 865aaa46574SAdrian Chadd 866aaa46574SAdrian Chadd ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 867aaa46574SAdrian Chadd ip6dc->ip6dc_nxt = nxt; 868aaa46574SAdrian Chadd ip6dc->ip6dc_off = offset; 869aaa46574SAdrian Chadd 870aaa46574SAdrian Chadd m_tag_prepend(m, mtag); 871aaa46574SAdrian Chadd #endif 872aaa46574SAdrian Chadd 8739cb1a47aSBjoern A. Zeeb IP6QB_UNLOCK(bucket); 8749cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_reassembled); 87582cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_ok); 87682cd038dSYoshinobu Inoue 877aaa46574SAdrian Chadd #ifdef RSS 87823d374aaSBjoern A. Zeeb /* Queue/dispatch for reprocessing. */ 879aaa46574SAdrian Chadd netisr_dispatch(NETISR_IPV6_DIRECT, m); 8805778b399SBjoern A. Zeeb return (IPPROTO_DONE); 881aaa46574SAdrian Chadd #endif 882aaa46574SAdrian Chadd 88323d374aaSBjoern A. Zeeb /* Tell launch routine the next header. */ 88482cd038dSYoshinobu Inoue *mp = m; 88582cd038dSYoshinobu Inoue *offp = offset; 88682cd038dSYoshinobu Inoue 8875778b399SBjoern A. Zeeb return (nxt); 88882cd038dSYoshinobu Inoue 88982cd038dSYoshinobu Inoue dropfrag: 8909cb1a47aSBjoern A. Zeeb IP6QB_UNLOCK(bucket); 8917715d794SBjoern A. Zeeb dropfrag2: 89282cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 8939cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 89482cd038dSYoshinobu Inoue m_freem(m); 8955778b399SBjoern A. Zeeb return (IPPROTO_DONE); 89682cd038dSYoshinobu Inoue } 89782cd038dSYoshinobu Inoue 89882cd038dSYoshinobu Inoue /* 89933841545SHajimu UMEMOTO * IPv6 reassembling timer processing; 90023d374aaSBjoern A. Zeeb * if a timer expires on a reassembly queue, discard it. 90182cd038dSYoshinobu Inoue */ 90282cd038dSYoshinobu Inoue void 9031272577eSXin LI frag6_slowtimo(void) 90482cd038dSYoshinobu Inoue { 9058b615593SMarko Zec VNET_ITERATOR_DECL(vnet_iter); 90621f08a07SBjoern A. Zeeb struct ip6qhead *head; 90721f08a07SBjoern A. Zeeb struct ip6q *q6, *q6tmp; 9089cb1a47aSBjoern A. Zeeb uint32_t bucket; 90982cd038dSYoshinobu Inoue 9105ee847d3SRobert Watson VNET_LIST_RLOCK_NOSLEEP(); 9118b615593SMarko Zec VNET_FOREACH(vnet_iter) { 9128b615593SMarko Zec CURVNET_SET(vnet_iter); 9139cb1a47aSBjoern A. Zeeb for (bucket = 0; bucket < IP6REASS_NHASH; bucket++) { 9149cb1a47aSBjoern A. Zeeb IP6QB_LOCK(bucket); 9159cb1a47aSBjoern A. Zeeb head = IP6QB_HEAD(bucket); 91621f08a07SBjoern A. Zeeb TAILQ_FOREACH_SAFE(q6, head, ip6q_tq, q6tmp) 91721f08a07SBjoern A. Zeeb if (--q6->ip6q_ttl == 0) { 918198fdaedSTom Jones IP6STAT_ADD(ip6s_fragtimeout, 91921f08a07SBjoern A. Zeeb q6->ip6q_nfrag); 92082cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 92121f08a07SBjoern A. Zeeb frag6_freef(q6, bucket); 92282cd038dSYoshinobu Inoue } 92382cd038dSYoshinobu Inoue /* 92482cd038dSYoshinobu Inoue * If we are over the maximum number of fragments 92582cd038dSYoshinobu Inoue * (due to the limit being lowered), drain off 92682cd038dSYoshinobu Inoue * enough to get down to the new limit. 9271e9f3b73SJonathan T. Looney * Note that we drain all reassembly queues if 9281e9f3b73SJonathan T. Looney * maxfragpackets is 0 (fragmentation is disabled), 92923d374aaSBjoern A. Zeeb * and do not enforce a limit when maxfragpackets 9301e9f3b73SJonathan T. Looney * is negative. 93182cd038dSYoshinobu Inoue */ 9321e9f3b73SJonathan T. Looney while ((V_ip6_maxfragpackets == 0 || 9331e9f3b73SJonathan T. Looney (V_ip6_maxfragpackets > 0 && 9349cb1a47aSBjoern A. Zeeb V_ip6qb[bucket].count > V_ip6_maxfragbucketsize)) && 93521f08a07SBjoern A. Zeeb (q6 = TAILQ_LAST(head, ip6qhead)) != NULL) { 93621f08a07SBjoern A. Zeeb IP6STAT_ADD(ip6s_fragoverflow, q6->ip6q_nfrag); 93782cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 93821f08a07SBjoern A. Zeeb frag6_freef(q6, bucket); 93980d7a853SJonathan T. Looney } 9409cb1a47aSBjoern A. Zeeb IP6QB_UNLOCK(bucket); 94182cd038dSYoshinobu Inoue } 9421e9f3b73SJonathan T. Looney /* 9431e9f3b73SJonathan T. Looney * If we are still over the maximum number of fragmented 9441e9f3b73SJonathan T. Looney * packets, drain off enough to get down to the new limit. 9451e9f3b73SJonathan T. Looney */ 9469cb1a47aSBjoern A. Zeeb bucket = 0; 9471e9f3b73SJonathan T. Looney while (V_ip6_maxfragpackets >= 0 && 9481e9f3b73SJonathan T. Looney atomic_load_int(&V_frag6_nfragpackets) > 9491e9f3b73SJonathan T. Looney (u_int)V_ip6_maxfragpackets) { 9509cb1a47aSBjoern A. Zeeb IP6QB_LOCK(bucket); 95121f08a07SBjoern A. Zeeb q6 = TAILQ_LAST(IP6QB_HEAD(bucket), ip6qhead); 95221f08a07SBjoern A. Zeeb if (q6 != NULL) { 95321f08a07SBjoern A. Zeeb IP6STAT_ADD(ip6s_fragoverflow, q6->ip6q_nfrag); 9541e9f3b73SJonathan T. Looney /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 95521f08a07SBjoern A. Zeeb frag6_freef(q6, bucket); 9561e9f3b73SJonathan T. Looney } 9579cb1a47aSBjoern A. Zeeb IP6QB_UNLOCK(bucket); 9589cb1a47aSBjoern A. Zeeb bucket = (bucket + 1) % IP6REASS_NHASH; 9591e9f3b73SJonathan T. Looney } 9608b615593SMarko Zec CURVNET_RESTORE(); 9618b615593SMarko Zec } 9625ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 96382cd038dSYoshinobu Inoue } 96482cd038dSYoshinobu Inoue 96523d374aaSBjoern A. Zeeb /* 96623d374aaSBjoern A. Zeeb * Eventhandler to adjust limits in case nmbclusters change. 96723d374aaSBjoern A. Zeeb */ 968c00464a2SBjoern A. Zeeb static void 969c00464a2SBjoern A. Zeeb frag6_change(void *tag) 970c00464a2SBjoern A. Zeeb { 971c00464a2SBjoern A. Zeeb VNET_ITERATOR_DECL(vnet_iter); 972c00464a2SBjoern A. Zeeb 973c00464a2SBjoern A. Zeeb ip6_maxfrags = IP6_MAXFRAGS; 974c00464a2SBjoern A. Zeeb VNET_LIST_RLOCK_NOSLEEP(); 975c00464a2SBjoern A. Zeeb VNET_FOREACH(vnet_iter) { 976c00464a2SBjoern A. Zeeb CURVNET_SET(vnet_iter); 977c00464a2SBjoern A. Zeeb V_ip6_maxfragpackets = IP6_MAXFRAGPACKETS; 978c00464a2SBjoern A. Zeeb frag6_set_bucketsize(); 979c00464a2SBjoern A. Zeeb CURVNET_RESTORE(); 980c00464a2SBjoern A. Zeeb } 981c00464a2SBjoern A. Zeeb VNET_LIST_RUNLOCK_NOSLEEP(); 982c00464a2SBjoern A. Zeeb } 983c00464a2SBjoern A. Zeeb 984c00464a2SBjoern A. Zeeb /* 985c00464a2SBjoern A. Zeeb * Initialise reassembly queue and fragment identifier. 986c00464a2SBjoern A. Zeeb */ 987c00464a2SBjoern A. Zeeb void 988c00464a2SBjoern A. Zeeb frag6_init(void) 989c00464a2SBjoern A. Zeeb { 9909cb1a47aSBjoern A. Zeeb uint32_t bucket; 991c00464a2SBjoern A. Zeeb 992c00464a2SBjoern A. Zeeb V_ip6_maxfragpackets = IP6_MAXFRAGPACKETS; 993c00464a2SBjoern A. Zeeb frag6_set_bucketsize(); 9949cb1a47aSBjoern A. Zeeb for (bucket = 0; bucket < IP6REASS_NHASH; bucket++) { 99521f08a07SBjoern A. Zeeb TAILQ_INIT(IP6QB_HEAD(bucket)); 996efdfee93SBjoern A. Zeeb mtx_init(&V_ip6qb[bucket].lock, "ip6qb", NULL, MTX_DEF); 9979cb1a47aSBjoern A. Zeeb V_ip6qb[bucket].count = 0; 998c00464a2SBjoern A. Zeeb } 9999cb1a47aSBjoern A. Zeeb V_ip6qb_hashseed = arc4random(); 1000c00464a2SBjoern A. Zeeb V_ip6_maxfragsperpacket = 64; 100167a10c46SBjoern A. Zeeb #ifdef VIMAGE 100267a10c46SBjoern A. Zeeb V_frag6_on = true; 100367a10c46SBjoern A. Zeeb #endif 1004c00464a2SBjoern A. Zeeb if (!IS_DEFAULT_VNET(curvnet)) 1005c00464a2SBjoern A. Zeeb return; 1006c00464a2SBjoern A. Zeeb 1007c00464a2SBjoern A. Zeeb ip6_maxfrags = IP6_MAXFRAGS; 1008c00464a2SBjoern A. Zeeb EVENTHANDLER_REGISTER(nmbclusters_change, 1009c00464a2SBjoern A. Zeeb frag6_change, NULL, EVENTHANDLER_PRI_ANY); 1010c00464a2SBjoern A. Zeeb } 1011c00464a2SBjoern A. Zeeb 101282cd038dSYoshinobu Inoue /* 101382cd038dSYoshinobu Inoue * Drain off all datagram fragments. 101482cd038dSYoshinobu Inoue */ 101567a10c46SBjoern A. Zeeb static void 101667a10c46SBjoern A. Zeeb frag6_drain_one(void) 101782cd038dSYoshinobu Inoue { 101821f08a07SBjoern A. Zeeb struct ip6q *q6; 10199cb1a47aSBjoern A. Zeeb uint32_t bucket; 10209888c401SHajimu UMEMOTO 10219cb1a47aSBjoern A. Zeeb for (bucket = 0; bucket < IP6REASS_NHASH; bucket++) { 102267a10c46SBjoern A. Zeeb IP6QB_LOCK(bucket); 102321f08a07SBjoern A. Zeeb while ((q6 = TAILQ_FIRST(IP6QB_HEAD(bucket))) != NULL) { 10249cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 102582cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 102621f08a07SBjoern A. Zeeb frag6_freef(q6, bucket); 102780d7a853SJonathan T. Looney } 10289cb1a47aSBjoern A. Zeeb IP6QB_UNLOCK(bucket); 102982cd038dSYoshinobu Inoue } 103067a10c46SBjoern A. Zeeb } 103167a10c46SBjoern A. Zeeb 103267a10c46SBjoern A. Zeeb void 103367a10c46SBjoern A. Zeeb frag6_drain(void) 103467a10c46SBjoern A. Zeeb { 103567a10c46SBjoern A. Zeeb VNET_ITERATOR_DECL(vnet_iter); 103667a10c46SBjoern A. Zeeb 103767a10c46SBjoern A. Zeeb VNET_LIST_RLOCK_NOSLEEP(); 103867a10c46SBjoern A. Zeeb VNET_FOREACH(vnet_iter) { 103967a10c46SBjoern A. Zeeb CURVNET_SET(vnet_iter); 104067a10c46SBjoern A. Zeeb frag6_drain_one(); 10418b615593SMarko Zec CURVNET_RESTORE(); 10428b615593SMarko Zec } 10435ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 104482cd038dSYoshinobu Inoue } 1045e5ee7060SGleb Smirnoff 104667a10c46SBjoern A. Zeeb #ifdef VIMAGE 104767a10c46SBjoern A. Zeeb /* 104867a10c46SBjoern A. Zeeb * Clear up IPv6 reassembly structures. 104967a10c46SBjoern A. Zeeb */ 105067a10c46SBjoern A. Zeeb void 105167a10c46SBjoern A. Zeeb frag6_destroy(void) 105267a10c46SBjoern A. Zeeb { 105367a10c46SBjoern A. Zeeb uint32_t bucket; 105467a10c46SBjoern A. Zeeb 105567a10c46SBjoern A. Zeeb frag6_drain_one(); 105667a10c46SBjoern A. Zeeb V_frag6_on = false; 105767a10c46SBjoern A. Zeeb for (bucket = 0; bucket < IP6REASS_NHASH; bucket++) { 105867a10c46SBjoern A. Zeeb KASSERT(V_ip6qb[bucket].count == 0, 105967a10c46SBjoern A. Zeeb ("%s: V_ip6qb[%d] (%p) count not 0 (%d)", __func__, 106067a10c46SBjoern A. Zeeb bucket, &V_ip6qb[bucket], V_ip6qb[bucket].count)); 106167a10c46SBjoern A. Zeeb mtx_destroy(&V_ip6qb[bucket].lock); 106267a10c46SBjoern A. Zeeb } 106367a10c46SBjoern A. Zeeb } 106467a10c46SBjoern A. Zeeb #endif 1065