![Denis V. Lunev](/assets/img/avatar_default.png)
Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
816 lines
20 KiB
C
816 lines
20 KiB
C
/*
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* IPv6 fragment reassembly
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* Based on: net/ipv4/ip_fragment.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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/*
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* Fixes:
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* Andi Kleen Make it work with multiple hosts.
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* More RFC compliance.
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*
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* Horst von Brand Add missing #include <linux/string.h>
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* Alexey Kuznetsov SMP races, threading, cleanup.
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* Patrick McHardy LRU queue of frag heads for evictor.
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* Mitsuru KANDA @USAGI Register inet6_protocol{}.
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* David Stevens and
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* YOSHIFUJI,H. @USAGI Always remove fragment header to
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* calculate ICV correctly.
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*/
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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/jhash.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/snmp.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.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_frag.h>
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struct ip6frag_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 FRAG6_CB(skb) ((struct ip6frag_skb_cb*)((skb)->cb))
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/*
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* Equivalent of ipv4 struct ipq
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*/
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struct frag_queue
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{
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struct inet_frag_queue q;
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__be32 id; /* fragment id */
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struct in6_addr saddr;
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struct in6_addr daddr;
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int iif;
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unsigned int csum;
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__u16 nhoffset;
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};
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static struct inet_frags ip6_frags;
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int ip6_frag_nqueues(struct net *net)
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{
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return net->ipv6.frags.nqueues;
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}
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int ip6_frag_mem(struct net *net)
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{
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return atomic_read(&net->ipv6.frags.mem);
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}
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static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
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struct net_device *dev);
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/*
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* callers should be careful not to use the hash value outside the ipfrag_lock
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* as doing so could race with ipfrag_hash_rnd being recalculated.
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*/
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unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
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const struct in6_addr *daddr, u32 rnd)
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{
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u32 a, b, c;
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a = (__force u32)saddr->s6_addr32[0];
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b = (__force u32)saddr->s6_addr32[1];
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c = (__force u32)saddr->s6_addr32[2];
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a += JHASH_GOLDEN_RATIO;
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b += JHASH_GOLDEN_RATIO;
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c += rnd;
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__jhash_mix(a, b, c);
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a += (__force u32)saddr->s6_addr32[3];
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b += (__force u32)daddr->s6_addr32[0];
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c += (__force u32)daddr->s6_addr32[1];
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__jhash_mix(a, b, c);
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a += (__force u32)daddr->s6_addr32[2];
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b += (__force u32)daddr->s6_addr32[3];
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c += (__force u32)id;
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__jhash_mix(a, b, c);
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return c & (INETFRAGS_HASHSZ - 1);
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}
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EXPORT_SYMBOL_GPL(inet6_hash_frag);
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static unsigned int ip6_hashfn(struct inet_frag_queue *q)
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{
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struct frag_queue *fq;
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fq = container_of(q, struct frag_queue, q);
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return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd);
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}
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int ip6_frag_match(struct inet_frag_queue *q, void *a)
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{
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struct frag_queue *fq;
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struct ip6_create_arg *arg = a;
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fq = container_of(q, struct frag_queue, q);
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return (fq->id == arg->id &&
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ipv6_addr_equal(&fq->saddr, arg->src) &&
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ipv6_addr_equal(&fq->daddr, arg->dst));
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}
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EXPORT_SYMBOL(ip6_frag_match);
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/* Memory Tracking Functions. */
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static inline void frag_kfree_skb(struct netns_frags *nf,
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struct sk_buff *skb, int *work)
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{
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if (work)
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*work -= skb->truesize;
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atomic_sub(skb->truesize, &nf->mem);
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kfree_skb(skb);
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}
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void ip6_frag_init(struct inet_frag_queue *q, void *a)
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{
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struct frag_queue *fq = container_of(q, struct frag_queue, q);
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struct ip6_create_arg *arg = a;
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fq->id = arg->id;
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ipv6_addr_copy(&fq->saddr, arg->src);
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ipv6_addr_copy(&fq->daddr, arg->dst);
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}
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EXPORT_SYMBOL(ip6_frag_init);
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/* Destruction primitives. */
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static __inline__ void fq_put(struct frag_queue *fq)
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{
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inet_frag_put(&fq->q, &ip6_frags);
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}
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/* Kill fq entry. It is not destroyed immediately,
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* because caller (and someone more) holds reference count.
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*/
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static __inline__ void fq_kill(struct frag_queue *fq)
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{
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inet_frag_kill(&fq->q, &ip6_frags);
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}
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static void ip6_evictor(struct net *net, struct inet6_dev *idev)
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{
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int evicted;
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evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
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if (evicted)
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IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
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}
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static void ip6_frag_expire(unsigned long data)
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{
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struct frag_queue *fq;
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struct net_device *dev = NULL;
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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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spin_lock(&fq->q.lock);
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if (fq->q.last_in & INET_FRAG_COMPLETE)
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goto out;
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fq_kill(fq);
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net = container_of(fq->q.net, struct net, ipv6.frags);
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dev = dev_get_by_index(net, fq->iif);
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if (!dev)
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goto out;
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rcu_read_lock();
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IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
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IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
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rcu_read_unlock();
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/* Don't send error if the first segment did not arrive. */
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if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
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goto out;
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/*
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But use as source device on which LAST ARRIVED
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segment was received. And do not use fq->dev
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pointer directly, device might already disappeared.
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*/
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fq->q.fragments->dev = dev;
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icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev);
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out:
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if (dev)
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dev_put(dev);
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spin_unlock(&fq->q.lock);
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fq_put(fq);
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}
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static __inline__ struct frag_queue *
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fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst,
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struct inet6_dev *idev)
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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.src = src;
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arg.dst = dst;
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read_lock(&ip6_frags.lock);
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hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd);
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q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
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if (q == NULL)
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goto oom;
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return container_of(q, struct frag_queue, q);
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oom:
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IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS);
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return NULL;
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}
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static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
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struct frag_hdr *fhdr, int nhoff)
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{
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struct sk_buff *prev, *next;
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struct net_device *dev;
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int offset, end;
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struct net *net = dev_net(skb->dst->dev);
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if (fq->q.last_in & INET_FRAG_COMPLETE)
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goto err;
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offset = ntohs(fhdr->frag_off) & ~0x7;
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end = offset + (ntohs(ipv6_hdr(skb)->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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IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst),
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IPSTATS_MIB_INHDRERRORS);
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icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
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((u8 *)&fhdr->frag_off -
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skb_network_header(skb)));
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return -1;
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}
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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.last_in & INET_FRAG_LAST_IN) && end != fq->q.len))
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goto err;
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fq->q.last_in |= 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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IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst),
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IPSTATS_MIB_INHDRERRORS);
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icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
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offsetof(struct ipv6hdr, payload_len));
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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.last_in & INET_FRAG_LAST_IN)
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goto err;
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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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goto err;
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if (pskb_trim_rcsum(skb, end - offset))
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goto err;
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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 = NULL;
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for(next = fq->q.fragments; next != NULL; next = next->next) {
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if (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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/* We found where to put this one. Check for overlap with
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* preceding fragment, and, if needed, align things so that
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* any overlaps are eliminated.
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*/
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if (prev) {
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int i = (FRAG6_CB(prev)->offset + prev->len) - offset;
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if (i > 0) {
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offset += i;
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if (end <= offset)
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goto err;
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if (!pskb_pull(skb, i))
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goto err;
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if (skb->ip_summed != CHECKSUM_UNNECESSARY)
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skb->ip_summed = CHECKSUM_NONE;
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}
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}
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/* Look for overlap with succeeding segments.
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* If we can merge fragments, do it.
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*/
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while (next && FRAG6_CB(next)->offset < end) {
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int i = end - FRAG6_CB(next)->offset; /* overlap is 'i' bytes */
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if (i < next->len) {
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/* Eat head of the next overlapped fragment
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* and leave the loop. The next ones cannot overlap.
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*/
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if (!pskb_pull(next, i))
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goto err;
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FRAG6_CB(next)->offset += i; /* next fragment */
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fq->q.meat -= i;
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if (next->ip_summed != CHECKSUM_UNNECESSARY)
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next->ip_summed = CHECKSUM_NONE;
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break;
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} else {
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struct sk_buff *free_it = next;
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/* Old fragment is completely overridden with
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* new one drop it.
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*/
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next = next->next;
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if (prev)
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prev->next = next;
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else
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fq->q.fragments = next;
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fq->q.meat -= free_it->len;
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frag_kfree_skb(fq->q.net, free_it, NULL);
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}
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}
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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 (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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dev = skb->dev;
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if (dev) {
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fq->iif = 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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atomic_add(skb->truesize, &fq->q.net->mem);
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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.last_in |= INET_FRAG_FIRST_IN;
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}
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if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
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fq->q.meat == fq->q.len)
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return ip6_frag_reasm(fq, prev, dev);
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write_lock(&ip6_frags.lock);
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list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
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write_unlock(&ip6_frags.lock);
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return -1;
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err:
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IP6_INC_STATS(net, ip6_dst_idev(skb->dst),
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IPSTATS_MIB_REASMFAILS);
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kfree_skb(skb);
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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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* Returns NULL on failure by any reason, and pointer
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* to current nexthdr field in reassembled frame.
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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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static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
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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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unsigned int nhoff;
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fq_kill(fq);
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/* Make the one we just received the head. */
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if (prev) {
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head = prev->next;
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fp = skb_clone(head, GFP_ATOMIC);
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if (!fp)
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goto out_oom;
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fp->next = head->next;
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prev->next = fp;
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skb_morph(head, fq->q.fragments);
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head->next = fq->q.fragments->next;
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kfree_skb(fq->q.fragments);
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fq->q.fragments = head;
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}
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WARN_ON(head == NULL);
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WARN_ON(FRAG6_CB(head)->offset != 0);
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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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goto out_oversize;
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/* Head of list must not be cloned. */
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if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
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goto out_oom;
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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_shinfo(head)->frag_list) {
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struct sk_buff *clone;
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int i, plen = 0;
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if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
|
|
goto out_oom;
|
|
clone->next = head->next;
|
|
head->next = clone;
|
|
skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
|
|
skb_shinfo(head)->frag_list = NULL;
|
|
for (i=0; i<skb_shinfo(head)->nr_frags; i++)
|
|
plen += skb_shinfo(head)->frags[i].size;
|
|
clone->len = clone->data_len = head->data_len - plen;
|
|
head->data_len -= clone->len;
|
|
head->len -= clone->len;
|
|
clone->csum = 0;
|
|
clone->ip_summed = head->ip_summed;
|
|
atomic_add(clone->truesize, &fq->q.net->mem);
|
|
}
|
|
|
|
/* We have to remove fragment header from datagram and to relocate
|
|
* header in order to calculate ICV correctly. */
|
|
nhoff = fq->nhoffset;
|
|
skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
|
|
memmove(head->head + sizeof(struct frag_hdr), head->head,
|
|
(head->data - head->head) - sizeof(struct frag_hdr));
|
|
head->mac_header += sizeof(struct frag_hdr);
|
|
head->network_header += sizeof(struct frag_hdr);
|
|
|
|
skb_shinfo(head)->frag_list = head->next;
|
|
skb_reset_transport_header(head);
|
|
skb_push(head, head->data - skb_network_header(head));
|
|
atomic_sub(head->truesize, &fq->q.net->mem);
|
|
|
|
for (fp=head->next; fp; fp = fp->next) {
|
|
head->data_len += fp->len;
|
|
head->len += fp->len;
|
|
if (head->ip_summed != fp->ip_summed)
|
|
head->ip_summed = CHECKSUM_NONE;
|
|
else if (head->ip_summed == CHECKSUM_COMPLETE)
|
|
head->csum = csum_add(head->csum, fp->csum);
|
|
head->truesize += fp->truesize;
|
|
atomic_sub(fp->truesize, &fq->q.net->mem);
|
|
}
|
|
|
|
head->next = NULL;
|
|
head->dev = dev;
|
|
head->tstamp = fq->q.stamp;
|
|
ipv6_hdr(head)->payload_len = htons(payload_len);
|
|
IP6CB(head)->nhoff = nhoff;
|
|
|
|
/* Yes, and fold redundant checksum back. 8) */
|
|
if (head->ip_summed == CHECKSUM_COMPLETE)
|
|
head->csum = csum_partial(skb_network_header(head),
|
|
skb_network_header_len(head),
|
|
head->csum);
|
|
|
|
rcu_read_lock();
|
|
IP6_INC_STATS_BH(dev_net(dev),
|
|
__in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
|
|
rcu_read_unlock();
|
|
fq->q.fragments = NULL;
|
|
return 1;
|
|
|
|
out_oversize:
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len);
|
|
goto out_fail;
|
|
out_oom:
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n");
|
|
out_fail:
|
|
rcu_read_lock();
|
|
IP6_INC_STATS_BH(dev_net(dev),
|
|
__in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
|
|
rcu_read_unlock();
|
|
return -1;
|
|
}
|
|
|
|
static int ipv6_frag_rcv(struct sk_buff *skb)
|
|
{
|
|
struct frag_hdr *fhdr;
|
|
struct frag_queue *fq;
|
|
struct ipv6hdr *hdr = ipv6_hdr(skb);
|
|
struct net *net = dev_net(skb->dst->dev);
|
|
|
|
IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMREQDS);
|
|
|
|
/* Jumbo payload inhibits frag. header */
|
|
if (hdr->payload_len==0)
|
|
goto fail_hdr;
|
|
|
|
if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
|
|
sizeof(struct frag_hdr))))
|
|
goto fail_hdr;
|
|
|
|
hdr = ipv6_hdr(skb);
|
|
fhdr = (struct frag_hdr *)skb_transport_header(skb);
|
|
|
|
if (!(fhdr->frag_off & htons(0xFFF9))) {
|
|
/* It is not a fragmented frame */
|
|
skb->transport_header += sizeof(struct frag_hdr);
|
|
IP6_INC_STATS_BH(net,
|
|
ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMOKS);
|
|
|
|
IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
|
|
return 1;
|
|
}
|
|
|
|
if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
|
|
ip6_evictor(net, ip6_dst_idev(skb->dst));
|
|
|
|
if ((fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
|
|
ip6_dst_idev(skb->dst))) != NULL) {
|
|
int ret;
|
|
|
|
spin_lock(&fq->q.lock);
|
|
|
|
ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
|
|
|
|
spin_unlock(&fq->q.lock);
|
|
fq_put(fq);
|
|
return ret;
|
|
}
|
|
|
|
IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMFAILS);
|
|
kfree_skb(skb);
|
|
return -1;
|
|
|
|
fail_hdr:
|
|
IP6_INC_STATS(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS);
|
|
icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
|
|
return -1;
|
|
}
|
|
|
|
static struct inet6_protocol frag_protocol =
|
|
{
|
|
.handler = ipv6_frag_rcv,
|
|
.flags = INET6_PROTO_NOPOLICY,
|
|
};
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static struct ctl_table ip6_frags_ns_ctl_table[] = {
|
|
{
|
|
.ctl_name = NET_IPV6_IP6FRAG_HIGH_THRESH,
|
|
.procname = "ip6frag_high_thresh",
|
|
.data = &init_net.ipv6.frags.high_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_IP6FRAG_LOW_THRESH,
|
|
.procname = "ip6frag_low_thresh",
|
|
.data = &init_net.ipv6.frags.low_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_IP6FRAG_TIME,
|
|
.procname = "ip6frag_time",
|
|
.data = &init_net.ipv6.frags.timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table ip6_frags_ctl_table[] = {
|
|
{
|
|
.ctl_name = NET_IPV6_IP6FRAG_SECRET_INTERVAL,
|
|
.procname = "ip6frag_secret_interval",
|
|
.data = &ip6_frags.secret_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int ip6_frags_ns_sysctl_register(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
struct ctl_table_header *hdr;
|
|
|
|
table = ip6_frags_ns_ctl_table;
|
|
if (net != &init_net) {
|
|
table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
|
|
if (table == NULL)
|
|
goto err_alloc;
|
|
|
|
table[0].data = &net->ipv6.frags.high_thresh;
|
|
table[1].data = &net->ipv6.frags.low_thresh;
|
|
table[2].data = &net->ipv6.frags.timeout;
|
|
}
|
|
|
|
hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
|
|
if (hdr == NULL)
|
|
goto err_reg;
|
|
|
|
net->ipv6.sysctl.frags_hdr = hdr;
|
|
return 0;
|
|
|
|
err_reg:
|
|
if (net != &init_net)
|
|
kfree(table);
|
|
err_alloc:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void ip6_frags_ns_sysctl_unregister(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
|
|
unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
|
|
kfree(table);
|
|
}
|
|
|
|
static struct ctl_table_header *ip6_ctl_header;
|
|
|
|
static int ip6_frags_sysctl_register(void)
|
|
{
|
|
ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path,
|
|
ip6_frags_ctl_table);
|
|
return ip6_ctl_header == NULL ? -ENOMEM : 0;
|
|
}
|
|
|
|
static void ip6_frags_sysctl_unregister(void)
|
|
{
|
|
unregister_net_sysctl_table(ip6_ctl_header);
|
|
}
|
|
#else
|
|
static inline int ip6_frags_ns_sysctl_register(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
|
|
{
|
|
}
|
|
|
|
static inline int ip6_frags_sysctl_register(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void ip6_frags_sysctl_unregister(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int ipv6_frags_init_net(struct net *net)
|
|
{
|
|
net->ipv6.frags.high_thresh = 256 * 1024;
|
|
net->ipv6.frags.low_thresh = 192 * 1024;
|
|
net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
|
|
|
|
inet_frags_init_net(&net->ipv6.frags);
|
|
|
|
return ip6_frags_ns_sysctl_register(net);
|
|
}
|
|
|
|
static void ipv6_frags_exit_net(struct net *net)
|
|
{
|
|
ip6_frags_ns_sysctl_unregister(net);
|
|
inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
|
|
}
|
|
|
|
static struct pernet_operations ip6_frags_ops = {
|
|
.init = ipv6_frags_init_net,
|
|
.exit = ipv6_frags_exit_net,
|
|
};
|
|
|
|
int __init ipv6_frag_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = ip6_frags_sysctl_register();
|
|
if (ret)
|
|
goto err_sysctl;
|
|
|
|
ret = register_pernet_subsys(&ip6_frags_ops);
|
|
if (ret)
|
|
goto err_pernet;
|
|
|
|
ip6_frags.hashfn = ip6_hashfn;
|
|
ip6_frags.constructor = ip6_frag_init;
|
|
ip6_frags.destructor = NULL;
|
|
ip6_frags.skb_free = NULL;
|
|
ip6_frags.qsize = sizeof(struct frag_queue);
|
|
ip6_frags.match = ip6_frag_match;
|
|
ip6_frags.frag_expire = ip6_frag_expire;
|
|
ip6_frags.secret_interval = 10 * 60 * HZ;
|
|
inet_frags_init(&ip6_frags);
|
|
out:
|
|
return ret;
|
|
|
|
err_pernet:
|
|
ip6_frags_sysctl_unregister();
|
|
err_sysctl:
|
|
inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
|
|
goto out;
|
|
}
|
|
|
|
void ipv6_frag_exit(void)
|
|
{
|
|
inet_frags_fini(&ip6_frags);
|
|
ip6_frags_sysctl_unregister();
|
|
unregister_pernet_subsys(&ip6_frags_ops);
|
|
inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
|
|
}
|