linux-imx

/*

 *  IPv6 fragment reassembly

 *  Linux INET6 implementation

 *

 *  Authors:

 *  Pedro Roque     <roque@di.fc.ul.pt>

 *

 *  Based on: net/ipv4/ip_fragment.c

 *

 *  This program is free software; you can redistribute it and/or

 *      modify it under the terms of the GNU General Public License

 *      as published by the Free Software Foundation; either version

 *      2 of the License, or (at your option) any later version.

 */

​

/*

 *  Fixes:

 *  Andi Kleen  Make it work with multiple hosts.

 *          More RFC compliance.

 *

 *      Horst von Brand Add missing #include <linux/string.h>

 *  Alexey Kuznetsov    SMP races, threading, cleanup.

 *  Patrick McHardy     LRU queue of frag heads for evictor.

 *  Mitsuru KANDA @USAGI    Register inet6_protocol{}.

 *  David Stevens and

 *  YOSHIFUJI,H. @USAGI Always remove fragment header to

 *              calculate ICV correctly.

 */

​

#define pr_fmt(fmt) "IPv6: " fmt

​

#include <linux/errno.h>

#include <linux/types.h>

#include <linux/string.h>

#include <linux/socket.h>

#include <linux/sockios.h>

#include <linux/jiffies.h>

#include <linux/net.h>

#include <linux/list.h>

#include <linux/netdevice.h>

#include <linux/in6.h>

#include <linux/ipv6.h>

#include <linux/icmpv6.h>

#include <linux/random.h>

#include <linux/jhash.h>

#include <linux/skbuff.h>

#include <linux/slab.h>

#include <linux/export.h>

​

#include <net/sock.h>

#include <net/snmp.h>

​

#include <net/ipv6.h>

#include <net/ip6_route.h>

#include <net/protocol.h>

#include <net/transp_v6.h>

#include <net/rawv6.h>

#include <net/ndisc.h>

#include <net/addrconf.h>

#include <net/ipv6_frag.h>

#include <net/inet_ecn.h>

​

static const char ip6_frag_cache_name[] = "ip6-frags";

​

static u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)

{

    return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);

}

​

static struct inet_frags ip6_frags;

​

static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb,

              struct sk_buff *prev_tail, struct net_device *dev);

​

static void ip6_frag_expire(struct timer_list *t)

{

    struct inet_frag_queue *frag = from_timer(frag, t, timer);

    struct frag_queue *fq;

    struct net *net;

​

    fq = container_of(frag, struct frag_queue, q);

    net = container_of(fq->q.net, struct net, ipv6.frags);

​

    ip6frag_expire_frag_queue(net, fq);

}

​

static struct frag_queue *

fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif)

{

    struct frag_v6_compare_key key = {

        .id = id,

        .saddr = hdr->saddr,