671 lines
16 KiB
C
671 lines
16 KiB
C
/*
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* IPv6 fragment reassembly for connection tracking
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*
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* Copyright (C)2004 USAGI/WIDE Project
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*
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* Author:
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* Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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*
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* Based on: net/ipv6/reassembly.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "IPv6-nf: " fmt
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/jiffies.h>
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#include <linux/net.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <linux/icmpv6.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <net/snmp.h>
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#include <net/inet_frag.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <net/transp_v6.h>
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#include <net/rawv6.h>
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#include <net/ndisc.h>
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#include <net/addrconf.h>
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#include <net/inet_ecn.h>
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#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
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#include <linux/sysctl.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
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static const char nf_frags_cache_name[] = "nf-frags";
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struct nf_ct_frag6_skb_cb
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{
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struct inet6_skb_parm h;
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int offset;
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};
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#define NFCT_FRAG6_CB(skb) ((struct nf_ct_frag6_skb_cb *)((skb)->cb))
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static struct inet_frags nf_frags;
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#ifdef CONFIG_SYSCTL
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static int zero;
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static struct ctl_table nf_ct_frag6_sysctl_table[] = {
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{
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.procname = "nf_conntrack_frag6_timeout",
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.data = &init_net.nf_frag.frags.timeout,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{
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.procname = "nf_conntrack_frag6_low_thresh",
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.data = &init_net.nf_frag.frags.low_thresh,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &init_net.nf_frag.frags.high_thresh
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},
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{
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.procname = "nf_conntrack_frag6_high_thresh",
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.data = &init_net.nf_frag.frags.high_thresh,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &init_net.nf_frag.frags.low_thresh
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},
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{ }
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};
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static int nf_ct_frag6_sysctl_register(struct net *net)
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{
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struct ctl_table *table;
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struct ctl_table_header *hdr;
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table = nf_ct_frag6_sysctl_table;
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if (!net_eq(net, &init_net)) {
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table = kmemdup(table, sizeof(nf_ct_frag6_sysctl_table),
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GFP_KERNEL);
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if (table == NULL)
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goto err_alloc;
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table[0].data = &net->nf_frag.frags.timeout;
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table[1].data = &net->nf_frag.frags.low_thresh;
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table[1].extra2 = &net->nf_frag.frags.high_thresh;
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table[2].data = &net->nf_frag.frags.high_thresh;
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table[2].extra1 = &net->nf_frag.frags.low_thresh;
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table[2].extra2 = &init_net.nf_frag.frags.high_thresh;
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}
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hdr = register_net_sysctl(net, "net/netfilter", table);
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if (hdr == NULL)
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goto err_reg;
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net->nf_frag.sysctl.frags_hdr = hdr;
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return 0;
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err_reg:
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if (!net_eq(net, &init_net))
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kfree(table);
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err_alloc:
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return -ENOMEM;
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}
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static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net)
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{
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struct ctl_table *table;
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table = net->nf_frag.sysctl.frags_hdr->ctl_table_arg;
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unregister_net_sysctl_table(net->nf_frag.sysctl.frags_hdr);
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if (!net_eq(net, &init_net))
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kfree(table);
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}
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#else
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static int nf_ct_frag6_sysctl_register(struct net *net)
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{
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return 0;
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}
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static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net)
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{
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}
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#endif
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static inline u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)
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{
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return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);
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}
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static unsigned int nf_hash_frag(__be32 id, const struct in6_addr *saddr,
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const struct in6_addr *daddr)
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{
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net_get_random_once(&nf_frags.rnd, sizeof(nf_frags.rnd));
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return jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),
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(__force u32)id, nf_frags.rnd);
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}
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static unsigned int nf_hashfn(const struct inet_frag_queue *q)
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{
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const struct frag_queue *nq;
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nq = container_of(q, struct frag_queue, q);
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return nf_hash_frag(nq->id, &nq->saddr, &nq->daddr);
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}
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static void nf_ct_frag6_expire(unsigned long data)
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{
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struct frag_queue *fq;
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struct net *net;
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fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
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net = container_of(fq->q.net, struct net, nf_frag.frags);
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ip6_expire_frag_queue(net, fq, &nf_frags);
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}
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/* Creation primitives. */
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static inline struct frag_queue *fq_find(struct net *net, __be32 id,
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u32 user, struct in6_addr *src,
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struct in6_addr *dst, int iif, u8 ecn)
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{
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struct inet_frag_queue *q;
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struct ip6_create_arg arg;
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unsigned int hash;
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arg.id = id;
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arg.user = user;
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arg.src = src;
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arg.dst = dst;
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arg.iif = iif;
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arg.ecn = ecn;
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local_bh_disable();
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hash = nf_hash_frag(id, src, dst);
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q = inet_frag_find(&net->nf_frag.frags, &nf_frags, &arg, hash);
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local_bh_enable();
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if (IS_ERR_OR_NULL(q)) {
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inet_frag_maybe_warn_overflow(q, pr_fmt());
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return NULL;
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}
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return container_of(q, struct frag_queue, q);
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}
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static int nf_ct_frag6_queue(struct frag_queue *fq, struct sk_buff *skb,
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const struct frag_hdr *fhdr, int nhoff)
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{
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struct sk_buff *prev, *next;
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unsigned int payload_len;
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int offset, end;
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u8 ecn;
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if (fq->q.flags & INET_FRAG_COMPLETE) {
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pr_debug("Already completed\n");
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goto err;
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}
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payload_len = ntohs(ipv6_hdr(skb)->payload_len);
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offset = ntohs(fhdr->frag_off) & ~0x7;
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end = offset + (payload_len -
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((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
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if ((unsigned int)end > IPV6_MAXPLEN) {
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pr_debug("offset is too large.\n");
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return -1;
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}
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ecn = ip6_frag_ecn(ipv6_hdr(skb));
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if (skb->ip_summed == CHECKSUM_COMPLETE) {
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const unsigned char *nh = skb_network_header(skb);
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skb->csum = csum_sub(skb->csum,
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csum_partial(nh, (u8 *)(fhdr + 1) - nh,
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0));
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}
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/* Is this the final fragment? */
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if (!(fhdr->frag_off & htons(IP6_MF))) {
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/* If we already have some bits beyond end
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* or have different end, the segment is corrupted.
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*/
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if (end < fq->q.len ||
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((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len)) {
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pr_debug("already received last fragment\n");
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goto err;
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}
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fq->q.flags |= INET_FRAG_LAST_IN;
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fq->q.len = end;
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} else {
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/* Check if the fragment is rounded to 8 bytes.
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* Required by the RFC.
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*/
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if (end & 0x7) {
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/* RFC2460 says always send parameter problem in
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* this case. -DaveM
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*/
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pr_debug("end of fragment not rounded to 8 bytes.\n");
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return -1;
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}
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if (end > fq->q.len) {
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/* Some bits beyond end -> corruption. */
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if (fq->q.flags & INET_FRAG_LAST_IN) {
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pr_debug("last packet already reached.\n");
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goto err;
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}
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fq->q.len = end;
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}
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}
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if (end == offset)
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goto err;
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/* Point into the IP datagram 'data' part. */
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if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) {
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pr_debug("queue: message is too short.\n");
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goto err;
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}
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if (pskb_trim_rcsum(skb, end - offset)) {
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pr_debug("Can't trim\n");
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goto err;
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}
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/* Find out which fragments are in front and at the back of us
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* in the chain of fragments so far. We must know where to put
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* this fragment, right?
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*/
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prev = fq->q.fragments_tail;
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if (!prev || NFCT_FRAG6_CB(prev)->offset < offset) {
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next = NULL;
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goto found;
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}
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prev = NULL;
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for (next = fq->q.fragments; next != NULL; next = next->next) {
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if (NFCT_FRAG6_CB(next)->offset >= offset)
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break; /* bingo! */
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prev = next;
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}
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found:
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/* RFC5722, Section 4:
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* When reassembling an IPv6 datagram, if
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* one or more its constituent fragments is determined to be an
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* overlapping fragment, the entire datagram (and any constituent
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* fragments, including those not yet received) MUST be silently
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* discarded.
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*/
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/* Check for overlap with preceding fragment. */
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if (prev &&
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(NFCT_FRAG6_CB(prev)->offset + prev->len) > offset)
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goto discard_fq;
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/* Look for overlap with succeeding segment. */
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if (next && NFCT_FRAG6_CB(next)->offset < end)
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goto discard_fq;
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NFCT_FRAG6_CB(skb)->offset = offset;
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/* Insert this fragment in the chain of fragments. */
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skb->next = next;
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if (!next)
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fq->q.fragments_tail = skb;
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if (prev)
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prev->next = skb;
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else
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fq->q.fragments = skb;
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if (skb->dev) {
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fq->iif = skb->dev->ifindex;
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skb->dev = NULL;
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}
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fq->q.stamp = skb->tstamp;
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fq->q.meat += skb->len;
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fq->ecn |= ecn;
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if (payload_len > fq->q.max_size)
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fq->q.max_size = payload_len;
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add_frag_mem_limit(fq->q.net, skb->truesize);
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/* The first fragment.
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* nhoffset is obtained from the first fragment, of course.
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*/
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if (offset == 0) {
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fq->nhoffset = nhoff;
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fq->q.flags |= INET_FRAG_FIRST_IN;
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}
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return 0;
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discard_fq:
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inet_frag_kill(&fq->q, &nf_frags);
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err:
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return -1;
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}
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/*
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* Check if this packet is complete.
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*
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* It is called with locked fq, and caller must check that
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* queue is eligible for reassembly i.e. it is not COMPLETE,
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* the last and the first frames arrived and all the bits are here.
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*
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* returns true if *prev skb has been transformed into the reassembled
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* skb, false otherwise.
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*/
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static bool
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nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *prev, struct net_device *dev)
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{
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struct sk_buff *fp, *head = fq->q.fragments;
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int payload_len;
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u8 ecn;
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inet_frag_kill(&fq->q, &nf_frags);
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WARN_ON(head == NULL);
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WARN_ON(NFCT_FRAG6_CB(head)->offset != 0);
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ecn = ip_frag_ecn_table[fq->ecn];
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if (unlikely(ecn == 0xff))
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return false;
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/* Unfragmented part is taken from the first segment. */
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payload_len = ((head->data - skb_network_header(head)) -
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sizeof(struct ipv6hdr) + fq->q.len -
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sizeof(struct frag_hdr));
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if (payload_len > IPV6_MAXPLEN) {
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net_dbg_ratelimited("nf_ct_frag6_reasm: payload len = %d\n",
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payload_len);
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return false;
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}
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/* Head of list must not be cloned. */
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if (skb_unclone(head, GFP_ATOMIC))
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return false;
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/* If the first fragment is fragmented itself, we split
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* it to two chunks: the first with data and paged part
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* and the second, holding only fragments. */
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if (skb_has_frag_list(head)) {
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struct sk_buff *clone;
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int i, plen = 0;
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clone = alloc_skb(0, GFP_ATOMIC);
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if (clone == NULL)
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return false;
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clone->next = head->next;
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head->next = clone;
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skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
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skb_frag_list_init(head);
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for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
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plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
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clone->len = clone->data_len = head->data_len - plen;
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head->data_len -= clone->len;
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head->len -= clone->len;
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clone->csum = 0;
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clone->ip_summed = head->ip_summed;
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add_frag_mem_limit(fq->q.net, clone->truesize);
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}
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/* morph head into last received skb: prev.
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*
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* This allows callers of ipv6 conntrack defrag to continue
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* to use the last skb(frag) passed into the reasm engine.
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* The last skb frag 'silently' turns into the full reassembled skb.
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*
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* Since prev is also part of q->fragments we have to clone it first.
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*/
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if (head != prev) {
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struct sk_buff *iter;
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fp = skb_clone(prev, GFP_ATOMIC);
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if (!fp)
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return false;
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fp->next = prev->next;
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iter = head;
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while (iter) {
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if (iter->next == prev) {
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iter->next = fp;
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break;
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}
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iter = iter->next;
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}
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skb_morph(prev, head);
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prev->next = head->next;
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consume_skb(head);
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head = prev;
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}
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/* We have to remove fragment header from datagram and to relocate
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* header in order to calculate ICV correctly. */
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skb_network_header(head)[fq->nhoffset] = skb_transport_header(head)[0];
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memmove(head->head + sizeof(struct frag_hdr), head->head,
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(head->data - head->head) - sizeof(struct frag_hdr));
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head->mac_header += sizeof(struct frag_hdr);
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head->network_header += sizeof(struct frag_hdr);
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skb_shinfo(head)->frag_list = head->next;
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skb_reset_transport_header(head);
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skb_push(head, head->data - skb_network_header(head));
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for (fp = head->next; fp; fp = fp->next) {
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head->data_len += fp->len;
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head->len += fp->len;
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if (head->ip_summed != fp->ip_summed)
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head->ip_summed = CHECKSUM_NONE;
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else if (head->ip_summed == CHECKSUM_COMPLETE)
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head->csum = csum_add(head->csum, fp->csum);
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head->truesize += fp->truesize;
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}
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sub_frag_mem_limit(fq->q.net, head->truesize);
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head->ignore_df = 1;
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head->next = NULL;
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head->dev = dev;
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head->tstamp = fq->q.stamp;
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ipv6_hdr(head)->payload_len = htons(payload_len);
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ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn);
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IP6CB(head)->frag_max_size = sizeof(struct ipv6hdr) + fq->q.max_size;
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/* Yes, and fold redundant checksum back. 8) */
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if (head->ip_summed == CHECKSUM_COMPLETE)
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head->csum = csum_partial(skb_network_header(head),
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skb_network_header_len(head),
|
|
head->csum);
|
|
|
|
fq->q.fragments = NULL;
|
|
fq->q.fragments_tail = NULL;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* find the header just before Fragment Header.
|
|
*
|
|
* if success return 0 and set ...
|
|
* (*prevhdrp): the value of "Next Header Field" in the header
|
|
* just before Fragment Header.
|
|
* (*prevhoff): the offset of "Next Header Field" in the header
|
|
* just before Fragment Header.
|
|
* (*fhoff) : the offset of Fragment Header.
|
|
*
|
|
* Based on ipv6_skip_hdr() in net/ipv6/exthdr.c
|
|
*
|
|
*/
|
|
static int
|
|
find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff)
|
|
{
|
|
u8 nexthdr = ipv6_hdr(skb)->nexthdr;
|
|
const int netoff = skb_network_offset(skb);
|
|
u8 prev_nhoff = netoff + offsetof(struct ipv6hdr, nexthdr);
|
|
int start = netoff + sizeof(struct ipv6hdr);
|
|
int len = skb->len - start;
|
|
u8 prevhdr = NEXTHDR_IPV6;
|
|
|
|
while (nexthdr != NEXTHDR_FRAGMENT) {
|
|
struct ipv6_opt_hdr hdr;
|
|
int hdrlen;
|
|
|
|
if (!ipv6_ext_hdr(nexthdr)) {
|
|
return -1;
|
|
}
|
|
if (nexthdr == NEXTHDR_NONE) {
|
|
pr_debug("next header is none\n");
|
|
return -1;
|
|
}
|
|
if (len < (int)sizeof(struct ipv6_opt_hdr)) {
|
|
pr_debug("too short\n");
|
|
return -1;
|
|
}
|
|
if (skb_copy_bits(skb, start, &hdr, sizeof(hdr)))
|
|
BUG();
|
|
if (nexthdr == NEXTHDR_AUTH)
|
|
hdrlen = (hdr.hdrlen+2)<<2;
|
|
else
|
|
hdrlen = ipv6_optlen(&hdr);
|
|
|
|
prevhdr = nexthdr;
|
|
prev_nhoff = start;
|
|
|
|
nexthdr = hdr.nexthdr;
|
|
len -= hdrlen;
|
|
start += hdrlen;
|
|
}
|
|
|
|
if (len < 0)
|
|
return -1;
|
|
|
|
*prevhdrp = prevhdr;
|
|
*prevhoff = prev_nhoff;
|
|
*fhoff = start;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user)
|
|
{
|
|
struct net_device *dev = skb->dev;
|
|
int fhoff, nhoff, ret;
|
|
struct frag_hdr *fhdr;
|
|
struct frag_queue *fq;
|
|
struct ipv6hdr *hdr;
|
|
u8 prevhdr;
|
|
|
|
/* Jumbo payload inhibits frag. header */
|
|
if (ipv6_hdr(skb)->payload_len == 0) {
|
|
pr_debug("payload len = 0\n");
|
|
return 0;
|
|
}
|
|
|
|
if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0)
|
|
return 0;
|
|
|
|
if (!pskb_may_pull(skb, fhoff + sizeof(*fhdr)))
|
|
return -ENOMEM;
|
|
|
|
skb_set_transport_header(skb, fhoff);
|
|
hdr = ipv6_hdr(skb);
|
|
fhdr = (struct frag_hdr *)skb_transport_header(skb);
|
|
|
|
skb_orphan(skb);
|
|
fq = fq_find(net, fhdr->identification, user, &hdr->saddr, &hdr->daddr,
|
|
skb->dev ? skb->dev->ifindex : 0, ip6_frag_ecn(hdr));
|
|
if (fq == NULL) {
|
|
pr_debug("Can't find and can't create new queue\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock_bh(&fq->q.lock);
|
|
|
|
if (nf_ct_frag6_queue(fq, skb, fhdr, nhoff) < 0) {
|
|
ret = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* after queue has assumed skb ownership, only 0 or -EINPROGRESS
|
|
* must be returned.
|
|
*/
|
|
ret = -EINPROGRESS;
|
|
if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
|
|
fq->q.meat == fq->q.len &&
|
|
nf_ct_frag6_reasm(fq, skb, dev))
|
|
ret = 0;
|
|
|
|
out_unlock:
|
|
spin_unlock_bh(&fq->q.lock);
|
|
inet_frag_put(&fq->q, &nf_frags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_ct_frag6_gather);
|
|
|
|
static int nf_ct_net_init(struct net *net)
|
|
{
|
|
net->nf_frag.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
|
|
net->nf_frag.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
|
|
net->nf_frag.frags.timeout = IPV6_FRAG_TIMEOUT;
|
|
inet_frags_init_net(&net->nf_frag.frags);
|
|
|
|
return nf_ct_frag6_sysctl_register(net);
|
|
}
|
|
|
|
static void nf_ct_net_exit(struct net *net)
|
|
{
|
|
nf_ct_frags6_sysctl_unregister(net);
|
|
inet_frags_exit_net(&net->nf_frag.frags, &nf_frags);
|
|
}
|
|
|
|
static struct pernet_operations nf_ct_net_ops = {
|
|
.init = nf_ct_net_init,
|
|
.exit = nf_ct_net_exit,
|
|
};
|
|
|
|
int nf_ct_frag6_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
nf_frags.hashfn = nf_hashfn;
|
|
nf_frags.constructor = ip6_frag_init;
|
|
nf_frags.destructor = NULL;
|
|
nf_frags.qsize = sizeof(struct frag_queue);
|
|
nf_frags.match = ip6_frag_match;
|
|
nf_frags.frag_expire = nf_ct_frag6_expire;
|
|
nf_frags.frags_cache_name = nf_frags_cache_name;
|
|
ret = inet_frags_init(&nf_frags);
|
|
if (ret)
|
|
goto out;
|
|
ret = register_pernet_subsys(&nf_ct_net_ops);
|
|
if (ret)
|
|
inet_frags_fini(&nf_frags);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void nf_ct_frag6_cleanup(void)
|
|
{
|
|
unregister_pernet_subsys(&nf_ct_net_ops);
|
|
inet_frags_fini(&nf_frags);
|
|
}
|