1caf43b02SWarner Losh /*- 282cd038dSYoshinobu Inoue * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 382cd038dSYoshinobu Inoue * All rights reserved. 482cd038dSYoshinobu Inoue * 582cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 682cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 782cd038dSYoshinobu Inoue * are met: 882cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 982cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 1082cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 1182cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 1282cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 1382cd038dSYoshinobu Inoue * 3. Neither the name of the project nor the names of its contributors 1482cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 1582cd038dSYoshinobu Inoue * without specific prior written permission. 1682cd038dSYoshinobu Inoue * 1782cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1882cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1982cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2082cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2182cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2282cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2382cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2482cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2582cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2682cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2782cd038dSYoshinobu Inoue * SUCH DAMAGE. 28b48287a3SDavid E. O'Brien * 29b48287a3SDavid E. O'Brien * $KAME: frag6.c,v 1.33 2002/01/07 11:34:48 kjc Exp $ 3082cd038dSYoshinobu Inoue */ 3182cd038dSYoshinobu Inoue 32b48287a3SDavid E. O'Brien #include <sys/cdefs.h> 33b48287a3SDavid E. O'Brien __FBSDID("$FreeBSD$"); 34b48287a3SDavid E. O'Brien 35aaa46574SAdrian Chadd #include "opt_rss.h" 36aaa46574SAdrian Chadd 3782cd038dSYoshinobu Inoue #include <sys/param.h> 3882cd038dSYoshinobu Inoue #include <sys/systm.h> 3982cd038dSYoshinobu Inoue #include <sys/malloc.h> 4082cd038dSYoshinobu Inoue #include <sys/mbuf.h> 4182cd038dSYoshinobu Inoue #include <sys/domain.h> 4282cd038dSYoshinobu Inoue #include <sys/protosw.h> 4382cd038dSYoshinobu Inoue #include <sys/socket.h> 4482cd038dSYoshinobu Inoue #include <sys/errno.h> 4582cd038dSYoshinobu Inoue #include <sys/time.h> 4682cd038dSYoshinobu Inoue #include <sys/kernel.h> 4782cd038dSYoshinobu Inoue #include <sys/syslog.h> 4882cd038dSYoshinobu Inoue 4982cd038dSYoshinobu Inoue #include <net/if.h> 5076039bc8SGleb Smirnoff #include <net/if_var.h> 51aaa46574SAdrian Chadd #include <net/netisr.h> 5282cd038dSYoshinobu Inoue #include <net/route.h> 53eddfbb76SRobert Watson #include <net/vnet.h> 5482cd038dSYoshinobu Inoue 5582cd038dSYoshinobu Inoue #include <netinet/in.h> 5682cd038dSYoshinobu Inoue #include <netinet/in_var.h> 57686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h> 5882cd038dSYoshinobu Inoue #include <netinet6/ip6_var.h> 59686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h> 6059dfcba4SHajimu UMEMOTO #include <netinet/in_systm.h> /* for ECN definitions */ 6159dfcba4SHajimu UMEMOTO #include <netinet/ip.h> /* for ECN definitions */ 6282cd038dSYoshinobu Inoue 634b908c8bSRobert Watson #include <security/mac/mac_framework.h> 644b908c8bSRobert Watson 659233d8f3SDavid E. O'Brien static void frag6_enq(struct ip6asfrag *, struct ip6asfrag *); 669233d8f3SDavid E. O'Brien static void frag6_deq(struct ip6asfrag *); 679233d8f3SDavid E. O'Brien static void frag6_insque(struct ip6q *, struct ip6q *); 689233d8f3SDavid E. O'Brien static void frag6_remque(struct ip6q *); 699233d8f3SDavid E. O'Brien static void frag6_freef(struct ip6q *); 7082cd038dSYoshinobu Inoue 7131e8f7e5SHajimu UMEMOTO static struct mtx ip6qlock; 7231e8f7e5SHajimu UMEMOTO /* 7331e8f7e5SHajimu UMEMOTO * These fields all protected by ip6qlock. 7431e8f7e5SHajimu UMEMOTO */ 753e288e62SDimitry Andric static VNET_DEFINE(u_int, frag6_nfragpackets); 763e288e62SDimitry Andric static VNET_DEFINE(u_int, frag6_nfrags); 773e288e62SDimitry Andric static VNET_DEFINE(struct ip6q, ip6q); /* ip6 reassemble queue */ 78eddfbb76SRobert Watson 791e77c105SRobert Watson #define V_frag6_nfragpackets VNET(frag6_nfragpackets) 801e77c105SRobert Watson #define V_frag6_nfrags VNET(frag6_nfrags) 811e77c105SRobert Watson #define V_ip6q VNET(ip6q) 8282cd038dSYoshinobu Inoue 8331e8f7e5SHajimu UMEMOTO #define IP6Q_LOCK_INIT() mtx_init(&ip6qlock, "ip6qlock", NULL, MTX_DEF); 8431e8f7e5SHajimu UMEMOTO #define IP6Q_LOCK() mtx_lock(&ip6qlock) 8531e8f7e5SHajimu UMEMOTO #define IP6Q_TRYLOCK() mtx_trylock(&ip6qlock) 869bcf770cSHajimu UMEMOTO #define IP6Q_LOCK_ASSERT() mtx_assert(&ip6qlock, MA_OWNED) 8731e8f7e5SHajimu UMEMOTO #define IP6Q_UNLOCK() mtx_unlock(&ip6qlock) 889888c401SHajimu UMEMOTO 89959b7375SPoul-Henning Kamp static MALLOC_DEFINE(M_FTABLE, "fragment", "fragment reassembly header"); 90686cdd19SJun-ichiro itojun Hagino 9182cd038dSYoshinobu Inoue /* 9282cd038dSYoshinobu Inoue * Initialise reassembly queue and fragment identifier. 9382cd038dSYoshinobu Inoue */ 944f590175SPaul Saab static void 954f590175SPaul Saab frag6_change(void *tag) 964f590175SPaul Saab { 974f590175SPaul Saab 98603724d3SBjoern A. Zeeb V_ip6_maxfragpackets = nmbclusters / 4; 99603724d3SBjoern A. Zeeb V_ip6_maxfrags = nmbclusters / 4; 1004f590175SPaul Saab } 1014f590175SPaul Saab 10282cd038dSYoshinobu Inoue void 1031272577eSXin LI frag6_init(void) 10482cd038dSYoshinobu Inoue { 10582cd038dSYoshinobu Inoue 106603724d3SBjoern A. Zeeb V_ip6_maxfragpackets = nmbclusters / 4; 107603724d3SBjoern A. Zeeb V_ip6_maxfrags = nmbclusters / 4; 10882cea7e6SBjoern A. Zeeb V_ip6q.ip6q_next = V_ip6q.ip6q_prev = &V_ip6q; 1091ed81b73SMarko Zec 1101ed81b73SMarko Zec if (!IS_DEFAULT_VNET(curvnet)) 1111ed81b73SMarko Zec return; 11296c2b042SJesper Skriver 1131ed81b73SMarko Zec EVENTHANDLER_REGISTER(nmbclusters_change, 1141ed81b73SMarko Zec frag6_change, NULL, EVENTHANDLER_PRI_ANY); 11582cea7e6SBjoern A. Zeeb 11682cea7e6SBjoern A. Zeeb IP6Q_LOCK_INIT(); 11782cd038dSYoshinobu Inoue } 11882cd038dSYoshinobu Inoue 11982cd038dSYoshinobu Inoue /* 120686cdd19SJun-ichiro itojun Hagino * In RFC2460, fragment and reassembly rule do not agree with each other, 121686cdd19SJun-ichiro itojun Hagino * in terms of next header field handling in fragment header. 122686cdd19SJun-ichiro itojun Hagino * While the sender will use the same value for all of the fragmented packets, 123686cdd19SJun-ichiro itojun Hagino * receiver is suggested not to check the consistency. 124686cdd19SJun-ichiro itojun Hagino * 125686cdd19SJun-ichiro itojun Hagino * fragment rule (p20): 126686cdd19SJun-ichiro itojun Hagino * (2) A Fragment header containing: 127686cdd19SJun-ichiro itojun Hagino * The Next Header value that identifies the first header of 128686cdd19SJun-ichiro itojun Hagino * the Fragmentable Part of the original packet. 129686cdd19SJun-ichiro itojun Hagino * -> next header field is same for all fragments 130686cdd19SJun-ichiro itojun Hagino * 131686cdd19SJun-ichiro itojun Hagino * reassembly rule (p21): 132686cdd19SJun-ichiro itojun Hagino * The Next Header field of the last header of the Unfragmentable 133686cdd19SJun-ichiro itojun Hagino * Part is obtained from the Next Header field of the first 134686cdd19SJun-ichiro itojun Hagino * fragment's Fragment header. 135686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 136686cdd19SJun-ichiro itojun Hagino * 137686cdd19SJun-ichiro itojun Hagino * The following note also contradicts with fragment rule - noone is going to 138686cdd19SJun-ichiro itojun Hagino * send different fragment with different next header field. 139686cdd19SJun-ichiro itojun Hagino * 140686cdd19SJun-ichiro itojun Hagino * additional note (p22): 141686cdd19SJun-ichiro itojun Hagino * The Next Header values in the Fragment headers of different 142686cdd19SJun-ichiro itojun Hagino * fragments of the same original packet may differ. Only the value 143686cdd19SJun-ichiro itojun Hagino * from the Offset zero fragment packet is used for reassembly. 144686cdd19SJun-ichiro itojun Hagino * -> should grab it from the first fragment only 145686cdd19SJun-ichiro itojun Hagino * 146686cdd19SJun-ichiro itojun Hagino * There is no explicit reason given in the RFC. Historical reason maybe? 147686cdd19SJun-ichiro itojun Hagino */ 148686cdd19SJun-ichiro itojun Hagino /* 14982cd038dSYoshinobu Inoue * Fragment input 15082cd038dSYoshinobu Inoue */ 15182cd038dSYoshinobu Inoue int 1521272577eSXin LI frag6_input(struct mbuf **mp, int *offp, int proto) 15382cd038dSYoshinobu Inoue { 15482cd038dSYoshinobu Inoue struct mbuf *m = *mp, *t; 15582cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 15682cd038dSYoshinobu Inoue struct ip6_frag *ip6f; 15782cd038dSYoshinobu Inoue struct ip6q *q6; 158686cdd19SJun-ichiro itojun Hagino struct ip6asfrag *af6, *ip6af, *af6dwn; 1592a5aafceSHajimu UMEMOTO struct in6_ifaddr *ia; 16082cd038dSYoshinobu Inoue int offset = *offp, nxt, i, next; 16182cd038dSYoshinobu Inoue int first_frag = 0; 162686cdd19SJun-ichiro itojun Hagino int fragoff, frgpartlen; /* must be larger than u_int16_t */ 16382cd038dSYoshinobu Inoue struct ifnet *dstifp; 16459dfcba4SHajimu UMEMOTO u_int8_t ecn, ecn0; 165aaa46574SAdrian Chadd #ifdef RSS 166aaa46574SAdrian Chadd struct m_tag *mtag; 167aaa46574SAdrian Chadd struct ip6_direct_ctx *ip6dc; 168aaa46574SAdrian Chadd #endif 169aaa46574SAdrian Chadd 1701d54aa3bSBjoern A. Zeeb #if 0 1711d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 1721d54aa3bSBjoern A. Zeeb #endif 17382cd038dSYoshinobu Inoue 17482cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 175686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST 176686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), IPPROTO_DONE); 17782cd038dSYoshinobu Inoue ip6f = (struct ip6_frag *)((caddr_t)ip6 + offset); 178686cdd19SJun-ichiro itojun Hagino #else 179686cdd19SJun-ichiro itojun Hagino IP6_EXTHDR_GET(ip6f, struct ip6_frag *, m, offset, sizeof(*ip6f)); 180686cdd19SJun-ichiro itojun Hagino if (ip6f == NULL) 18140e39bbbSHajimu UMEMOTO return (IPPROTO_DONE); 182686cdd19SJun-ichiro itojun Hagino #endif 18382cd038dSYoshinobu Inoue 18482cd038dSYoshinobu Inoue dstifp = NULL; 18582cd038dSYoshinobu Inoue /* find the destination interface of the packet. */ 1863e88eb90SAndrey V. Elsukov ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 1873e88eb90SAndrey V. Elsukov if (ia != NULL) { 1882a5aafceSHajimu UMEMOTO dstifp = ia->ia_ifp; 1898c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 1908c0fec80SRobert Watson } 19182cd038dSYoshinobu Inoue /* jumbo payload can't contain a fragment header */ 19282cd038dSYoshinobu Inoue if (ip6->ip6_plen == 0) { 19382cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, offset); 19482cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 19582cd038dSYoshinobu Inoue return IPPROTO_DONE; 19682cd038dSYoshinobu Inoue } 19782cd038dSYoshinobu Inoue 19882cd038dSYoshinobu Inoue /* 19982cd038dSYoshinobu Inoue * check whether fragment packet's fragment length is 20082cd038dSYoshinobu Inoue * multiple of 8 octets. 20182cd038dSYoshinobu Inoue * sizeof(struct ip6_frag) == 8 20282cd038dSYoshinobu Inoue * sizeof(struct ip6_hdr) = 40 20382cd038dSYoshinobu Inoue */ 20482cd038dSYoshinobu Inoue if ((ip6f->ip6f_offlg & IP6F_MORE_FRAG) && 20582cd038dSYoshinobu Inoue (((ntohs(ip6->ip6_plen) - offset) & 0x7) != 0)) { 20606cd0a3fSHajimu UMEMOTO icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 207686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_hdr, ip6_plen)); 20882cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 20982cd038dSYoshinobu Inoue return IPPROTO_DONE; 21082cd038dSYoshinobu Inoue } 21182cd038dSYoshinobu Inoue 2129cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragments); 21382cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_reqd); 21482cd038dSYoshinobu Inoue 215686cdd19SJun-ichiro itojun Hagino /* offset now points to data portion */ 21682cd038dSYoshinobu Inoue offset += sizeof(struct ip6_frag); 21782cd038dSYoshinobu Inoue 2184018ea9aSBjoern A. Zeeb /* 219fd291ae3SBjoern A. Zeeb * RFC 6946: Handle "atomic" fragments (offset and m bit set to 0) 220fd291ae3SBjoern A. Zeeb * upfront, unrelated to any reassembly. Just skip the fragment header. 2214018ea9aSBjoern A. Zeeb */ 2224018ea9aSBjoern A. Zeeb if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) { 2234018ea9aSBjoern A. Zeeb /* XXX-BZ we want dedicated counters for this. */ 2249cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_reassembled); 2254018ea9aSBjoern A. Zeeb in6_ifstat_inc(dstifp, ifs6_reass_ok); 2264018ea9aSBjoern A. Zeeb *offp = offset; 2274018ea9aSBjoern A. Zeeb return (ip6f->ip6f_nxt); 2284018ea9aSBjoern A. Zeeb } 2294018ea9aSBjoern A. Zeeb 2309888c401SHajimu UMEMOTO IP6Q_LOCK(); 2319888c401SHajimu UMEMOTO 2329888c401SHajimu UMEMOTO /* 2339888c401SHajimu UMEMOTO * Enforce upper bound on number of fragments. 2349888c401SHajimu UMEMOTO * If maxfrag is 0, never accept fragments. 2359888c401SHajimu UMEMOTO * If maxfrag is -1, accept all fragments without limitation. 2369888c401SHajimu UMEMOTO */ 237603724d3SBjoern A. Zeeb if (V_ip6_maxfrags < 0) 2389888c401SHajimu UMEMOTO ; 239603724d3SBjoern A. Zeeb else if (V_frag6_nfrags >= (u_int)V_ip6_maxfrags) 2409888c401SHajimu UMEMOTO goto dropfrag; 24133841545SHajimu UMEMOTO 242603724d3SBjoern A. Zeeb for (q6 = V_ip6q.ip6q_next; q6 != &V_ip6q; q6 = q6->ip6q_next) 24382cd038dSYoshinobu Inoue if (ip6f->ip6f_ident == q6->ip6q_ident && 24482cd038dSYoshinobu Inoue IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &q6->ip6q_src) && 2454b908c8bSRobert Watson IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &q6->ip6q_dst) 2464b908c8bSRobert Watson #ifdef MAC 2474b908c8bSRobert Watson && mac_ip6q_match(m, q6) 2484b908c8bSRobert Watson #endif 2494b908c8bSRobert Watson ) 25082cd038dSYoshinobu Inoue break; 25182cd038dSYoshinobu Inoue 252603724d3SBjoern A. Zeeb if (q6 == &V_ip6q) { 25382cd038dSYoshinobu Inoue /* 25482cd038dSYoshinobu Inoue * the first fragment to arrive, create a reassembly queue. 25582cd038dSYoshinobu Inoue */ 25682cd038dSYoshinobu Inoue first_frag = 1; 25782cd038dSYoshinobu Inoue 25882cd038dSYoshinobu Inoue /* 25982cd038dSYoshinobu Inoue * Enforce upper bound on number of fragmented packets 26082cd038dSYoshinobu Inoue * for which we attempt reassembly; 2619888c401SHajimu UMEMOTO * If maxfragpackets is 0, never accept fragments. 2629888c401SHajimu UMEMOTO * If maxfragpackets is -1, accept all fragments without 2639888c401SHajimu UMEMOTO * limitation. 26482cd038dSYoshinobu Inoue */ 265603724d3SBjoern A. Zeeb if (V_ip6_maxfragpackets < 0) 26633841545SHajimu UMEMOTO ; 267603724d3SBjoern A. Zeeb else if (V_frag6_nfragpackets >= (u_int)V_ip6_maxfragpackets) 26833841545SHajimu UMEMOTO goto dropfrag; 269603724d3SBjoern A. Zeeb V_frag6_nfragpackets++; 27082cd038dSYoshinobu Inoue q6 = (struct ip6q *)malloc(sizeof(struct ip6q), M_FTABLE, 2718c0dd0e4SHajimu UMEMOTO M_NOWAIT); 27282cd038dSYoshinobu Inoue if (q6 == NULL) 27382cd038dSYoshinobu Inoue goto dropfrag; 274686cdd19SJun-ichiro itojun Hagino bzero(q6, sizeof(*q6)); 2754b908c8bSRobert Watson #ifdef MAC 2764b908c8bSRobert Watson if (mac_ip6q_init(q6, M_NOWAIT) != 0) { 2774b908c8bSRobert Watson free(q6, M_FTABLE); 2784b908c8bSRobert Watson goto dropfrag; 2794b908c8bSRobert Watson } 2804b908c8bSRobert Watson mac_ip6q_create(m, q6); 2814b908c8bSRobert Watson #endif 282603724d3SBjoern A. Zeeb frag6_insque(q6, &V_ip6q); 28382cd038dSYoshinobu Inoue 284686cdd19SJun-ichiro itojun Hagino /* ip6q_nxt will be filled afterwards, from 1st fragment */ 28582cd038dSYoshinobu Inoue q6->ip6q_down = q6->ip6q_up = (struct ip6asfrag *)q6; 286686cdd19SJun-ichiro itojun Hagino #ifdef notyet 287686cdd19SJun-ichiro itojun Hagino q6->ip6q_nxtp = (u_char *)nxtp; 288686cdd19SJun-ichiro itojun Hagino #endif 28982cd038dSYoshinobu Inoue q6->ip6q_ident = ip6f->ip6f_ident; 29082cd038dSYoshinobu Inoue q6->ip6q_ttl = IPV6_FRAGTTL; 29182cd038dSYoshinobu Inoue q6->ip6q_src = ip6->ip6_src; 29282cd038dSYoshinobu Inoue q6->ip6q_dst = ip6->ip6_dst; 2935e9510e3SJINMEI Tatuya q6->ip6q_ecn = 2945e9510e3SJINMEI Tatuya (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 29582cd038dSYoshinobu Inoue q6->ip6q_unfrglen = -1; /* The 1st fragment has not arrived. */ 2969888c401SHajimu UMEMOTO 2979888c401SHajimu UMEMOTO q6->ip6q_nfrag = 0; 29882cd038dSYoshinobu Inoue } 29982cd038dSYoshinobu Inoue 30082cd038dSYoshinobu Inoue /* 30182cd038dSYoshinobu Inoue * If it's the 1st fragment, record the length of the 30282cd038dSYoshinobu Inoue * unfragmentable part and the next header of the fragment header. 30382cd038dSYoshinobu Inoue */ 30482cd038dSYoshinobu Inoue fragoff = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK); 30582cd038dSYoshinobu Inoue if (fragoff == 0) { 30606cd0a3fSHajimu UMEMOTO q6->ip6q_unfrglen = offset - sizeof(struct ip6_hdr) - 30706cd0a3fSHajimu UMEMOTO sizeof(struct ip6_frag); 30882cd038dSYoshinobu Inoue q6->ip6q_nxt = ip6f->ip6f_nxt; 30982cd038dSYoshinobu Inoue } 31082cd038dSYoshinobu Inoue 31182cd038dSYoshinobu Inoue /* 31282cd038dSYoshinobu Inoue * Check that the reassembled packet would not exceed 65535 bytes 31382cd038dSYoshinobu Inoue * in size. 31482cd038dSYoshinobu Inoue * If it would exceed, discard the fragment and return an ICMP error. 31582cd038dSYoshinobu Inoue */ 31682cd038dSYoshinobu Inoue frgpartlen = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - offset; 31782cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen >= 0) { 31882cd038dSYoshinobu Inoue /* The 1st fragment has already arrived. */ 31982cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + fragoff + frgpartlen > IPV6_MAXPACKET) { 32082cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 321686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 322686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 3239888c401SHajimu UMEMOTO IP6Q_UNLOCK(); 32482cd038dSYoshinobu Inoue return (IPPROTO_DONE); 32582cd038dSYoshinobu Inoue } 32606cd0a3fSHajimu UMEMOTO } else if (fragoff + frgpartlen > IPV6_MAXPACKET) { 32782cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 328686cdd19SJun-ichiro itojun Hagino offset - sizeof(struct ip6_frag) + 329686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 3309888c401SHajimu UMEMOTO IP6Q_UNLOCK(); 33182cd038dSYoshinobu Inoue return (IPPROTO_DONE); 33282cd038dSYoshinobu Inoue } 33382cd038dSYoshinobu Inoue /* 33482cd038dSYoshinobu Inoue * If it's the first fragment, do the above check for each 33582cd038dSYoshinobu Inoue * fragment already stored in the reassembly queue. 33682cd038dSYoshinobu Inoue */ 33782cd038dSYoshinobu Inoue if (fragoff == 0) { 33882cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 33982cd038dSYoshinobu Inoue af6 = af6dwn) { 34082cd038dSYoshinobu Inoue af6dwn = af6->ip6af_down; 34182cd038dSYoshinobu Inoue 34282cd038dSYoshinobu Inoue if (q6->ip6q_unfrglen + af6->ip6af_off + af6->ip6af_frglen > 34382cd038dSYoshinobu Inoue IPV6_MAXPACKET) { 34482cd038dSYoshinobu Inoue struct mbuf *merr = IP6_REASS_MBUF(af6); 34582cd038dSYoshinobu Inoue struct ip6_hdr *ip6err; 34682cd038dSYoshinobu Inoue int erroff = af6->ip6af_offset; 34782cd038dSYoshinobu Inoue 34882cd038dSYoshinobu Inoue /* dequeue the fragment. */ 34982cd038dSYoshinobu Inoue frag6_deq(af6); 350686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 35182cd038dSYoshinobu Inoue 35282cd038dSYoshinobu Inoue /* adjust pointer. */ 35382cd038dSYoshinobu Inoue ip6err = mtod(merr, struct ip6_hdr *); 35482cd038dSYoshinobu Inoue 35582cd038dSYoshinobu Inoue /* 35682cd038dSYoshinobu Inoue * Restore source and destination addresses 35782cd038dSYoshinobu Inoue * in the erroneous IPv6 header. 35882cd038dSYoshinobu Inoue */ 35982cd038dSYoshinobu Inoue ip6err->ip6_src = q6->ip6q_src; 36082cd038dSYoshinobu Inoue ip6err->ip6_dst = q6->ip6q_dst; 36182cd038dSYoshinobu Inoue 36282cd038dSYoshinobu Inoue icmp6_error(merr, ICMP6_PARAM_PROB, 36382cd038dSYoshinobu Inoue ICMP6_PARAMPROB_HEADER, 364686cdd19SJun-ichiro itojun Hagino erroff - sizeof(struct ip6_frag) + 365686cdd19SJun-ichiro itojun Hagino offsetof(struct ip6_frag, ip6f_offlg)); 36682cd038dSYoshinobu Inoue } 36782cd038dSYoshinobu Inoue } 36882cd038dSYoshinobu Inoue } 36982cd038dSYoshinobu Inoue 370686cdd19SJun-ichiro itojun Hagino ip6af = (struct ip6asfrag *)malloc(sizeof(struct ip6asfrag), M_FTABLE, 3718c0dd0e4SHajimu UMEMOTO M_NOWAIT); 372686cdd19SJun-ichiro itojun Hagino if (ip6af == NULL) 373686cdd19SJun-ichiro itojun Hagino goto dropfrag; 374686cdd19SJun-ichiro itojun Hagino bzero(ip6af, sizeof(*ip6af)); 37582cd038dSYoshinobu Inoue ip6af->ip6af_mff = ip6f->ip6f_offlg & IP6F_MORE_FRAG; 37682cd038dSYoshinobu Inoue ip6af->ip6af_off = fragoff; 37782cd038dSYoshinobu Inoue ip6af->ip6af_frglen = frgpartlen; 37882cd038dSYoshinobu Inoue ip6af->ip6af_offset = offset; 37982cd038dSYoshinobu Inoue IP6_REASS_MBUF(ip6af) = m; 38082cd038dSYoshinobu Inoue 38182cd038dSYoshinobu Inoue if (first_frag) { 38282cd038dSYoshinobu Inoue af6 = (struct ip6asfrag *)q6; 38382cd038dSYoshinobu Inoue goto insert; 38482cd038dSYoshinobu Inoue } 38582cd038dSYoshinobu Inoue 38682cd038dSYoshinobu Inoue /* 38759dfcba4SHajimu UMEMOTO * Handle ECN by comparing this segment with the first one; 38859dfcba4SHajimu UMEMOTO * if CE is set, do not lose CE. 38959dfcba4SHajimu UMEMOTO * drop if CE and not-ECT are mixed for the same packet. 39059dfcba4SHajimu UMEMOTO */ 39159dfcba4SHajimu UMEMOTO ecn = (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK; 3925e9510e3SJINMEI Tatuya ecn0 = q6->ip6q_ecn; 39359dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_CE) { 39459dfcba4SHajimu UMEMOTO if (ecn0 == IPTOS_ECN_NOTECT) { 39559dfcba4SHajimu UMEMOTO free(ip6af, M_FTABLE); 39659dfcba4SHajimu UMEMOTO goto dropfrag; 39759dfcba4SHajimu UMEMOTO } 39859dfcba4SHajimu UMEMOTO if (ecn0 != IPTOS_ECN_CE) 3995e9510e3SJINMEI Tatuya q6->ip6q_ecn = IPTOS_ECN_CE; 40059dfcba4SHajimu UMEMOTO } 40159dfcba4SHajimu UMEMOTO if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT) { 40259dfcba4SHajimu UMEMOTO free(ip6af, M_FTABLE); 40359dfcba4SHajimu UMEMOTO goto dropfrag; 40459dfcba4SHajimu UMEMOTO } 40559dfcba4SHajimu UMEMOTO 40659dfcba4SHajimu UMEMOTO /* 40782cd038dSYoshinobu Inoue * Find a segment which begins after this one does. 40882cd038dSYoshinobu Inoue */ 40982cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 41082cd038dSYoshinobu Inoue af6 = af6->ip6af_down) 41182cd038dSYoshinobu Inoue if (af6->ip6af_off > ip6af->ip6af_off) 41282cd038dSYoshinobu Inoue break; 41382cd038dSYoshinobu Inoue 414686cdd19SJun-ichiro itojun Hagino #if 0 415686cdd19SJun-ichiro itojun Hagino /* 416686cdd19SJun-ichiro itojun Hagino * If there is a preceding segment, it may provide some of 417686cdd19SJun-ichiro itojun Hagino * our data already. If so, drop the data from the incoming 418686cdd19SJun-ichiro itojun Hagino * segment. If it provides all of our data, drop us. 419686cdd19SJun-ichiro itojun Hagino */ 420686cdd19SJun-ichiro itojun Hagino if (af6->ip6af_up != (struct ip6asfrag *)q6) { 421686cdd19SJun-ichiro itojun Hagino i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 422686cdd19SJun-ichiro itojun Hagino - ip6af->ip6af_off; 423686cdd19SJun-ichiro itojun Hagino if (i > 0) { 424686cdd19SJun-ichiro itojun Hagino if (i >= ip6af->ip6af_frglen) 425686cdd19SJun-ichiro itojun Hagino goto dropfrag; 426686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(ip6af), i); 427686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off += i; 428686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_frglen -= i; 429686cdd19SJun-ichiro itojun Hagino } 430686cdd19SJun-ichiro itojun Hagino } 431686cdd19SJun-ichiro itojun Hagino 432686cdd19SJun-ichiro itojun Hagino /* 433686cdd19SJun-ichiro itojun Hagino * While we overlap succeeding segments trim them or, 434686cdd19SJun-ichiro itojun Hagino * if they are completely covered, dequeue them. 435686cdd19SJun-ichiro itojun Hagino */ 436686cdd19SJun-ichiro itojun Hagino while (af6 != (struct ip6asfrag *)q6 && 437686cdd19SJun-ichiro itojun Hagino ip6af->ip6af_off + ip6af->ip6af_frglen > af6->ip6af_off) { 438686cdd19SJun-ichiro itojun Hagino i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 439686cdd19SJun-ichiro itojun Hagino if (i < af6->ip6af_frglen) { 440686cdd19SJun-ichiro itojun Hagino af6->ip6af_frglen -= i; 441686cdd19SJun-ichiro itojun Hagino af6->ip6af_off += i; 442686cdd19SJun-ichiro itojun Hagino m_adj(IP6_REASS_MBUF(af6), i); 443686cdd19SJun-ichiro itojun Hagino break; 444686cdd19SJun-ichiro itojun Hagino } 445686cdd19SJun-ichiro itojun Hagino af6 = af6->ip6af_down; 446686cdd19SJun-ichiro itojun Hagino m_freem(IP6_REASS_MBUF(af6->ip6af_up)); 447686cdd19SJun-ichiro itojun Hagino frag6_deq(af6->ip6af_up); 448686cdd19SJun-ichiro itojun Hagino } 449686cdd19SJun-ichiro itojun Hagino #else 45082cd038dSYoshinobu Inoue /* 45182cd038dSYoshinobu Inoue * If the incoming framgent overlaps some existing fragments in 45282cd038dSYoshinobu Inoue * the reassembly queue, drop it, since it is dangerous to override 45382cd038dSYoshinobu Inoue * existing fragments from a security point of view. 4549888c401SHajimu UMEMOTO * We don't know which fragment is the bad guy - here we trust 4559888c401SHajimu UMEMOTO * fragment that came in earlier, with no real reason. 4565e9510e3SJINMEI Tatuya * 4575e9510e3SJINMEI Tatuya * Note: due to changes after disabling this part, mbuf passed to 4585e9510e3SJINMEI Tatuya * m_adj() below now does not meet the requirement. 45982cd038dSYoshinobu Inoue */ 46082cd038dSYoshinobu Inoue if (af6->ip6af_up != (struct ip6asfrag *)q6) { 46182cd038dSYoshinobu Inoue i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen 46282cd038dSYoshinobu Inoue - ip6af->ip6af_off; 46382cd038dSYoshinobu Inoue if (i > 0) { 4642bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 46582cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 46682cd038dSYoshinobu Inoue "overlaps the previous fragment\n", 4671d54aa3bSBjoern A. Zeeb i, ip6_sprintf(ip6buf, &q6->ip6q_src)); 4682bf76779SMunechika SUMIKAWA #endif 4692bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 47082cd038dSYoshinobu Inoue goto dropfrag; 47182cd038dSYoshinobu Inoue } 47282cd038dSYoshinobu Inoue } 47382cd038dSYoshinobu Inoue if (af6 != (struct ip6asfrag *)q6) { 47482cd038dSYoshinobu Inoue i = (ip6af->ip6af_off + ip6af->ip6af_frglen) - af6->ip6af_off; 47582cd038dSYoshinobu Inoue if (i > 0) { 4762bf76779SMunechika SUMIKAWA #if 0 /* suppress the noisy log */ 47782cd038dSYoshinobu Inoue log(LOG_ERR, "%d bytes of a fragment from %s " 47882cd038dSYoshinobu Inoue "overlaps the succeeding fragment", 4791d54aa3bSBjoern A. Zeeb i, ip6_sprintf(ip6buf, &q6->ip6q_src)); 4802bf76779SMunechika SUMIKAWA #endif 4812bf76779SMunechika SUMIKAWA free(ip6af, M_FTABLE); 48282cd038dSYoshinobu Inoue goto dropfrag; 48382cd038dSYoshinobu Inoue } 48482cd038dSYoshinobu Inoue } 485686cdd19SJun-ichiro itojun Hagino #endif 48682cd038dSYoshinobu Inoue 48782cd038dSYoshinobu Inoue insert: 4884b908c8bSRobert Watson #ifdef MAC 4894b908c8bSRobert Watson if (!first_frag) 4904b908c8bSRobert Watson mac_ip6q_update(m, q6); 4914b908c8bSRobert Watson #endif 49282cd038dSYoshinobu Inoue 49382cd038dSYoshinobu Inoue /* 49482cd038dSYoshinobu Inoue * Stick new segment in its place; 49582cd038dSYoshinobu Inoue * check for complete reassembly. 49682cd038dSYoshinobu Inoue * Move to front of packet queue, as we are 49782cd038dSYoshinobu Inoue * the most recently active fragmented packet. 49882cd038dSYoshinobu Inoue */ 49982cd038dSYoshinobu Inoue frag6_enq(ip6af, af6->ip6af_up); 500603724d3SBjoern A. Zeeb V_frag6_nfrags++; 5019888c401SHajimu UMEMOTO q6->ip6q_nfrag++; 502686cdd19SJun-ichiro itojun Hagino #if 0 /* xxx */ 503603724d3SBjoern A. Zeeb if (q6 != V_ip6q.ip6q_next) { 504686cdd19SJun-ichiro itojun Hagino frag6_remque(q6); 505603724d3SBjoern A. Zeeb frag6_insque(q6, &V_ip6q); 506686cdd19SJun-ichiro itojun Hagino } 507686cdd19SJun-ichiro itojun Hagino #endif 50882cd038dSYoshinobu Inoue next = 0; 50982cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 51082cd038dSYoshinobu Inoue af6 = af6->ip6af_down) { 51182cd038dSYoshinobu Inoue if (af6->ip6af_off != next) { 5129888c401SHajimu UMEMOTO IP6Q_UNLOCK(); 51382cd038dSYoshinobu Inoue return IPPROTO_DONE; 51482cd038dSYoshinobu Inoue } 51582cd038dSYoshinobu Inoue next += af6->ip6af_frglen; 51682cd038dSYoshinobu Inoue } 51782cd038dSYoshinobu Inoue if (af6->ip6af_up->ip6af_mff) { 5189888c401SHajimu UMEMOTO IP6Q_UNLOCK(); 51982cd038dSYoshinobu Inoue return IPPROTO_DONE; 52082cd038dSYoshinobu Inoue } 52182cd038dSYoshinobu Inoue 52282cd038dSYoshinobu Inoue /* 52382cd038dSYoshinobu Inoue * Reassembly is complete; concatenate fragments. 52482cd038dSYoshinobu Inoue */ 52582cd038dSYoshinobu Inoue ip6af = q6->ip6q_down; 52682cd038dSYoshinobu Inoue t = m = IP6_REASS_MBUF(ip6af); 52782cd038dSYoshinobu Inoue af6 = ip6af->ip6af_down; 528686cdd19SJun-ichiro itojun Hagino frag6_deq(ip6af); 52982cd038dSYoshinobu Inoue while (af6 != (struct ip6asfrag *)q6) { 530686cdd19SJun-ichiro itojun Hagino af6dwn = af6->ip6af_down; 531686cdd19SJun-ichiro itojun Hagino frag6_deq(af6); 53282cd038dSYoshinobu Inoue while (t->m_next) 53382cd038dSYoshinobu Inoue t = t->m_next; 534ba99cc0bSAlexander V. Chernikov m_adj(IP6_REASS_MBUF(af6), af6->ip6af_offset); 535ba99cc0bSAlexander V. Chernikov m_cat(t, IP6_REASS_MBUF(af6)); 536686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 537686cdd19SJun-ichiro itojun Hagino af6 = af6dwn; 53882cd038dSYoshinobu Inoue } 53982cd038dSYoshinobu Inoue 54082cd038dSYoshinobu Inoue /* adjust offset to point where the original next header starts */ 54182cd038dSYoshinobu Inoue offset = ip6af->ip6af_offset - sizeof(struct ip6_frag); 542686cdd19SJun-ichiro itojun Hagino free(ip6af, M_FTABLE); 543686cdd19SJun-ichiro itojun Hagino ip6 = mtod(m, struct ip6_hdr *); 54482cd038dSYoshinobu Inoue ip6->ip6_plen = htons((u_short)next + offset - sizeof(struct ip6_hdr)); 5455e9510e3SJINMEI Tatuya if (q6->ip6q_ecn == IPTOS_ECN_CE) 5465e9510e3SJINMEI Tatuya ip6->ip6_flow |= htonl(IPTOS_ECN_CE << 20); 54782cd038dSYoshinobu Inoue nxt = q6->ip6q_nxt; 548686cdd19SJun-ichiro itojun Hagino #ifdef notyet 549686cdd19SJun-ichiro itojun Hagino *q6->ip6q_nxtp = (u_char)(nxt & 0xff); 550686cdd19SJun-ichiro itojun Hagino #endif 55182cd038dSYoshinobu Inoue 5520b438b0fSGleb Smirnoff if (ip6_deletefraghdr(m, offset, M_NOWAIT) != 0) { 553686cdd19SJun-ichiro itojun Hagino frag6_remque(q6); 554603724d3SBjoern A. Zeeb V_frag6_nfrags -= q6->ip6q_nfrag; 5554b908c8bSRobert Watson #ifdef MAC 5564b908c8bSRobert Watson mac_ip6q_destroy(q6); 5574b908c8bSRobert Watson #endif 558686cdd19SJun-ichiro itojun Hagino free(q6, M_FTABLE); 559603724d3SBjoern A. Zeeb V_frag6_nfragpackets--; 5600b438b0fSGleb Smirnoff 561686cdd19SJun-ichiro itojun Hagino goto dropfrag; 56282cd038dSYoshinobu Inoue } 56382cd038dSYoshinobu Inoue 56482cd038dSYoshinobu Inoue /* 56582cd038dSYoshinobu Inoue * Store NXT to the original. 56682cd038dSYoshinobu Inoue */ 56782cd038dSYoshinobu Inoue { 56882cd038dSYoshinobu Inoue char *prvnxtp = ip6_get_prevhdr(m, offset); /* XXX */ 56982cd038dSYoshinobu Inoue *prvnxtp = nxt; 57082cd038dSYoshinobu Inoue } 57182cd038dSYoshinobu Inoue 57282cd038dSYoshinobu Inoue frag6_remque(q6); 573603724d3SBjoern A. Zeeb V_frag6_nfrags -= q6->ip6q_nfrag; 5744b908c8bSRobert Watson #ifdef MAC 5754b908c8bSRobert Watson mac_ip6q_reassemble(q6, m); 5764b908c8bSRobert Watson mac_ip6q_destroy(q6); 5774b908c8bSRobert Watson #endif 57882cd038dSYoshinobu Inoue free(q6, M_FTABLE); 579603724d3SBjoern A. Zeeb V_frag6_nfragpackets--; 58082cd038dSYoshinobu Inoue 58182cd038dSYoshinobu Inoue if (m->m_flags & M_PKTHDR) { /* Isn't it always true? */ 58282cd038dSYoshinobu Inoue int plen = 0; 58382cd038dSYoshinobu Inoue for (t = m; t; t = t->m_next) 58482cd038dSYoshinobu Inoue plen += t->m_len; 58582cd038dSYoshinobu Inoue m->m_pkthdr.len = plen; 58682cd038dSYoshinobu Inoue } 58782cd038dSYoshinobu Inoue 588aaa46574SAdrian Chadd #ifdef RSS 589aaa46574SAdrian Chadd mtag = m_tag_alloc(MTAG_ABI_IPV6, IPV6_TAG_DIRECT, sizeof(*ip6dc), 590aaa46574SAdrian Chadd M_NOWAIT); 591aaa46574SAdrian Chadd if (mtag == NULL) 592aaa46574SAdrian Chadd goto dropfrag; 593aaa46574SAdrian Chadd 594aaa46574SAdrian Chadd ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 595aaa46574SAdrian Chadd ip6dc->ip6dc_nxt = nxt; 596aaa46574SAdrian Chadd ip6dc->ip6dc_off = offset; 597aaa46574SAdrian Chadd 598aaa46574SAdrian Chadd m_tag_prepend(m, mtag); 599aaa46574SAdrian Chadd #endif 600aaa46574SAdrian Chadd 601aaa46574SAdrian Chadd IP6Q_UNLOCK(); 6029cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_reassembled); 60382cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_ok); 60482cd038dSYoshinobu Inoue 605aaa46574SAdrian Chadd #ifdef RSS 606aaa46574SAdrian Chadd /* 607aaa46574SAdrian Chadd * Queue/dispatch for reprocessing. 608aaa46574SAdrian Chadd */ 609aaa46574SAdrian Chadd netisr_dispatch(NETISR_IPV6_DIRECT, m); 610aaa46574SAdrian Chadd return IPPROTO_DONE; 611aaa46574SAdrian Chadd #endif 612aaa46574SAdrian Chadd 61382cd038dSYoshinobu Inoue /* 61482cd038dSYoshinobu Inoue * Tell launch routine the next header 61582cd038dSYoshinobu Inoue */ 61682cd038dSYoshinobu Inoue 61782cd038dSYoshinobu Inoue *mp = m; 61882cd038dSYoshinobu Inoue *offp = offset; 61982cd038dSYoshinobu Inoue 62082cd038dSYoshinobu Inoue return nxt; 62182cd038dSYoshinobu Inoue 62282cd038dSYoshinobu Inoue dropfrag: 62331e8f7e5SHajimu UMEMOTO IP6Q_UNLOCK(); 62482cd038dSYoshinobu Inoue in6_ifstat_inc(dstifp, ifs6_reass_fail); 6259cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 62682cd038dSYoshinobu Inoue m_freem(m); 62782cd038dSYoshinobu Inoue return IPPROTO_DONE; 62882cd038dSYoshinobu Inoue } 62982cd038dSYoshinobu Inoue 63082cd038dSYoshinobu Inoue /* 63182cd038dSYoshinobu Inoue * Free a fragment reassembly header and all 63282cd038dSYoshinobu Inoue * associated datagrams. 63382cd038dSYoshinobu Inoue */ 63482cd038dSYoshinobu Inoue void 6351272577eSXin LI frag6_freef(struct ip6q *q6) 63682cd038dSYoshinobu Inoue { 63782cd038dSYoshinobu Inoue struct ip6asfrag *af6, *down6; 63882cd038dSYoshinobu Inoue 6399bcf770cSHajimu UMEMOTO IP6Q_LOCK_ASSERT(); 6409888c401SHajimu UMEMOTO 64182cd038dSYoshinobu Inoue for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6; 64282cd038dSYoshinobu Inoue af6 = down6) { 64382cd038dSYoshinobu Inoue struct mbuf *m = IP6_REASS_MBUF(af6); 64482cd038dSYoshinobu Inoue 64582cd038dSYoshinobu Inoue down6 = af6->ip6af_down; 64682cd038dSYoshinobu Inoue frag6_deq(af6); 64782cd038dSYoshinobu Inoue 64882cd038dSYoshinobu Inoue /* 64982cd038dSYoshinobu Inoue * Return ICMP time exceeded error for the 1st fragment. 65082cd038dSYoshinobu Inoue * Just free other fragments. 65182cd038dSYoshinobu Inoue */ 65282cd038dSYoshinobu Inoue if (af6->ip6af_off == 0) { 65382cd038dSYoshinobu Inoue struct ip6_hdr *ip6; 65482cd038dSYoshinobu Inoue 65582cd038dSYoshinobu Inoue /* adjust pointer */ 65682cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 65782cd038dSYoshinobu Inoue 65806cd0a3fSHajimu UMEMOTO /* restore source and destination addresses */ 65982cd038dSYoshinobu Inoue ip6->ip6_src = q6->ip6q_src; 66082cd038dSYoshinobu Inoue ip6->ip6_dst = q6->ip6q_dst; 66182cd038dSYoshinobu Inoue 66282cd038dSYoshinobu Inoue icmp6_error(m, ICMP6_TIME_EXCEEDED, 66382cd038dSYoshinobu Inoue ICMP6_TIME_EXCEED_REASSEMBLY, 0); 664686cdd19SJun-ichiro itojun Hagino } else 66582cd038dSYoshinobu Inoue m_freem(m); 666686cdd19SJun-ichiro itojun Hagino free(af6, M_FTABLE); 66782cd038dSYoshinobu Inoue } 66882cd038dSYoshinobu Inoue frag6_remque(q6); 669603724d3SBjoern A. Zeeb V_frag6_nfrags -= q6->ip6q_nfrag; 6704b908c8bSRobert Watson #ifdef MAC 6714b908c8bSRobert Watson mac_ip6q_destroy(q6); 6724b908c8bSRobert Watson #endif 67382cd038dSYoshinobu Inoue free(q6, M_FTABLE); 674603724d3SBjoern A. Zeeb V_frag6_nfragpackets--; 67582cd038dSYoshinobu Inoue } 67682cd038dSYoshinobu Inoue 67782cd038dSYoshinobu Inoue /* 67882cd038dSYoshinobu Inoue * Put an ip fragment on a reassembly chain. 67982cd038dSYoshinobu Inoue * Like insque, but pointers in middle of structure. 68082cd038dSYoshinobu Inoue */ 68182cd038dSYoshinobu Inoue void 6821272577eSXin LI frag6_enq(struct ip6asfrag *af6, struct ip6asfrag *up6) 68382cd038dSYoshinobu Inoue { 6849888c401SHajimu UMEMOTO 6859bcf770cSHajimu UMEMOTO IP6Q_LOCK_ASSERT(); 6869888c401SHajimu UMEMOTO 68782cd038dSYoshinobu Inoue af6->ip6af_up = up6; 68882cd038dSYoshinobu Inoue af6->ip6af_down = up6->ip6af_down; 68982cd038dSYoshinobu Inoue up6->ip6af_down->ip6af_up = af6; 69082cd038dSYoshinobu Inoue up6->ip6af_down = af6; 69182cd038dSYoshinobu Inoue } 69282cd038dSYoshinobu Inoue 69382cd038dSYoshinobu Inoue /* 69482cd038dSYoshinobu Inoue * To frag6_enq as remque is to insque. 69582cd038dSYoshinobu Inoue */ 69682cd038dSYoshinobu Inoue void 6971272577eSXin LI frag6_deq(struct ip6asfrag *af6) 69882cd038dSYoshinobu Inoue { 6999888c401SHajimu UMEMOTO 7009bcf770cSHajimu UMEMOTO IP6Q_LOCK_ASSERT(); 7019888c401SHajimu UMEMOTO 70282cd038dSYoshinobu Inoue af6->ip6af_up->ip6af_down = af6->ip6af_down; 70382cd038dSYoshinobu Inoue af6->ip6af_down->ip6af_up = af6->ip6af_up; 70482cd038dSYoshinobu Inoue } 70582cd038dSYoshinobu Inoue 70682cd038dSYoshinobu Inoue void 7071272577eSXin LI frag6_insque(struct ip6q *new, struct ip6q *old) 70882cd038dSYoshinobu Inoue { 7099888c401SHajimu UMEMOTO 7109bcf770cSHajimu UMEMOTO IP6Q_LOCK_ASSERT(); 7119888c401SHajimu UMEMOTO 71282cd038dSYoshinobu Inoue new->ip6q_prev = old; 71382cd038dSYoshinobu Inoue new->ip6q_next = old->ip6q_next; 71482cd038dSYoshinobu Inoue old->ip6q_next->ip6q_prev= new; 71582cd038dSYoshinobu Inoue old->ip6q_next = new; 71682cd038dSYoshinobu Inoue } 71782cd038dSYoshinobu Inoue 71882cd038dSYoshinobu Inoue void 7191272577eSXin LI frag6_remque(struct ip6q *p6) 72082cd038dSYoshinobu Inoue { 7219888c401SHajimu UMEMOTO 7229bcf770cSHajimu UMEMOTO IP6Q_LOCK_ASSERT(); 7239888c401SHajimu UMEMOTO 72482cd038dSYoshinobu Inoue p6->ip6q_prev->ip6q_next = p6->ip6q_next; 72582cd038dSYoshinobu Inoue p6->ip6q_next->ip6q_prev = p6->ip6q_prev; 72682cd038dSYoshinobu Inoue } 72782cd038dSYoshinobu Inoue 72882cd038dSYoshinobu Inoue /* 72933841545SHajimu UMEMOTO * IPv6 reassembling timer processing; 73082cd038dSYoshinobu Inoue * if a timer expires on a reassembly 73182cd038dSYoshinobu Inoue * queue, discard it. 73282cd038dSYoshinobu Inoue */ 73382cd038dSYoshinobu Inoue void 7341272577eSXin LI frag6_slowtimo(void) 73582cd038dSYoshinobu Inoue { 7368b615593SMarko Zec VNET_ITERATOR_DECL(vnet_iter); 73782cd038dSYoshinobu Inoue struct ip6q *q6; 73882cd038dSYoshinobu Inoue 7395ee847d3SRobert Watson VNET_LIST_RLOCK_NOSLEEP(); 7409888c401SHajimu UMEMOTO IP6Q_LOCK(); 7418b615593SMarko Zec VNET_FOREACH(vnet_iter) { 7428b615593SMarko Zec CURVNET_SET(vnet_iter); 743603724d3SBjoern A. Zeeb q6 = V_ip6q.ip6q_next; 74482cd038dSYoshinobu Inoue if (q6) 745603724d3SBjoern A. Zeeb while (q6 != &V_ip6q) { 74682cd038dSYoshinobu Inoue --q6->ip6q_ttl; 74782cd038dSYoshinobu Inoue q6 = q6->ip6q_next; 74882cd038dSYoshinobu Inoue if (q6->ip6q_prev->ip6q_ttl == 0) { 7499cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragtimeout); 75082cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 75182cd038dSYoshinobu Inoue frag6_freef(q6->ip6q_prev); 75282cd038dSYoshinobu Inoue } 75382cd038dSYoshinobu Inoue } 75482cd038dSYoshinobu Inoue /* 75582cd038dSYoshinobu Inoue * If we are over the maximum number of fragments 75682cd038dSYoshinobu Inoue * (due to the limit being lowered), drain off 75782cd038dSYoshinobu Inoue * enough to get down to the new limit. 75882cd038dSYoshinobu Inoue */ 759603724d3SBjoern A. Zeeb while (V_frag6_nfragpackets > (u_int)V_ip6_maxfragpackets && 760603724d3SBjoern A. Zeeb V_ip6q.ip6q_prev) { 7619cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragoverflow); 76282cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 763603724d3SBjoern A. Zeeb frag6_freef(V_ip6q.ip6q_prev); 76482cd038dSYoshinobu Inoue } 7658b615593SMarko Zec CURVNET_RESTORE(); 7668b615593SMarko Zec } 7679888c401SHajimu UMEMOTO IP6Q_UNLOCK(); 7685ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 76982cd038dSYoshinobu Inoue } 77082cd038dSYoshinobu Inoue 77182cd038dSYoshinobu Inoue /* 77282cd038dSYoshinobu Inoue * Drain off all datagram fragments. 77382cd038dSYoshinobu Inoue */ 77482cd038dSYoshinobu Inoue void 7751272577eSXin LI frag6_drain(void) 77682cd038dSYoshinobu Inoue { 7778b615593SMarko Zec VNET_ITERATOR_DECL(vnet_iter); 7789888c401SHajimu UMEMOTO 7795ee847d3SRobert Watson VNET_LIST_RLOCK_NOSLEEP(); 7805ee847d3SRobert Watson if (IP6Q_TRYLOCK() == 0) { 7815ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 78282cd038dSYoshinobu Inoue return; 7835ee847d3SRobert Watson } 7848b615593SMarko Zec VNET_FOREACH(vnet_iter) { 7858b615593SMarko Zec CURVNET_SET(vnet_iter); 786603724d3SBjoern A. Zeeb while (V_ip6q.ip6q_next != &V_ip6q) { 7879cb8d207SAndrey V. Elsukov IP6STAT_INC(ip6s_fragdropped); 78882cd038dSYoshinobu Inoue /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */ 789603724d3SBjoern A. Zeeb frag6_freef(V_ip6q.ip6q_next); 79082cd038dSYoshinobu Inoue } 7918b615593SMarko Zec CURVNET_RESTORE(); 7928b615593SMarko Zec } 7939888c401SHajimu UMEMOTO IP6Q_UNLOCK(); 7945ee847d3SRobert Watson VNET_LIST_RUNLOCK_NOSLEEP(); 79582cd038dSYoshinobu Inoue } 796e5ee7060SGleb Smirnoff 797e5ee7060SGleb Smirnoff int 798e5ee7060SGleb Smirnoff ip6_deletefraghdr(struct mbuf *m, int offset, int wait) 799e5ee7060SGleb Smirnoff { 800e5ee7060SGleb Smirnoff struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 801e5ee7060SGleb Smirnoff struct mbuf *t; 802e5ee7060SGleb Smirnoff 803e5ee7060SGleb Smirnoff /* Delete frag6 header. */ 804e5ee7060SGleb Smirnoff if (m->m_len >= offset + sizeof(struct ip6_frag)) { 805e5ee7060SGleb Smirnoff /* This is the only possible case with !PULLDOWN_TEST. */ 806e5ee7060SGleb Smirnoff bcopy(ip6, (char *)ip6 + sizeof(struct ip6_frag), 807e5ee7060SGleb Smirnoff offset); 808e5ee7060SGleb Smirnoff m->m_data += sizeof(struct ip6_frag); 809e5ee7060SGleb Smirnoff m->m_len -= sizeof(struct ip6_frag); 810e5ee7060SGleb Smirnoff } else { 811e5ee7060SGleb Smirnoff /* This comes with no copy if the boundary is on cluster. */ 812e5ee7060SGleb Smirnoff if ((t = m_split(m, offset, wait)) == NULL) 813e5ee7060SGleb Smirnoff return (ENOMEM); 814e5ee7060SGleb Smirnoff m_adj(t, sizeof(struct ip6_frag)); 815e5ee7060SGleb Smirnoff m_cat(m, t); 816e5ee7060SGleb Smirnoff } 817e5ee7060SGleb Smirnoff 818e5ee7060SGleb Smirnoff return (0); 819e5ee7060SGleb Smirnoff } 820