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![Su Yanjun](/assets/img/avatar_default.png)
Signed-off-by: Su Yanjun <suyj.fnst@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
708 lines
18 KiB
C
708 lines
18 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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#define pr_fmt(fmt) "IPv6: " 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/jhash.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/export.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/ipv6_frag.h>
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#include <net/inet_ecn.h>
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static const char ip6_frag_cache_name[] = "ip6-frags";
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static 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 struct inet_frags ip6_frags;
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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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static void ip6_frag_expire(struct timer_list *t)
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{
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struct inet_frag_queue *frag = from_timer(frag, t, timer);
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struct frag_queue *fq;
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struct net *net;
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fq = container_of(frag, struct frag_queue, q);
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net = container_of(fq->q.net, struct net, ipv6.frags);
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ip6frag_expire_frag_queue(net, fq);
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}
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static struct frag_queue *
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fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif)
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{
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struct frag_v6_compare_key key = {
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.id = id,
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.saddr = hdr->saddr,
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.daddr = hdr->daddr,
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.user = IP6_DEFRAG_LOCAL_DELIVER,
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.iif = iif,
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};
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struct inet_frag_queue *q;
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if (!(ipv6_addr_type(&hdr->daddr) & (IPV6_ADDR_MULTICAST |
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IPV6_ADDR_LINKLOCAL)))
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key.iif = 0;
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q = inet_frag_find(&net->ipv6.frags, &key);
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if (!q)
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return NULL;
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return container_of(q, struct frag_queue, q);
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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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u32 *prob_offset)
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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, fragsize;
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struct net *net = dev_net(skb_dst(skb)->dev);
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u8 ecn;
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if (fq->q.flags & 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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*prob_offset = (u8 *)&fhdr->frag_off - skb_network_header(skb);
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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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goto discard_fq;
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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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*prob_offset = 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.flags & INET_FRAG_LAST_IN)
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goto discard_fq;
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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 discard_fq;
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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 discard_fq;
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if (pskb_trim_rcsum(skb, end - offset))
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goto discard_fq;
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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 || prev->ip_defrag_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 (next->ip_defrag_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, amended by Errata ID : 3089
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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) MUST be silently 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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(prev->ip_defrag_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 && next->ip_defrag_offset < end)
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goto discard_fq;
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/* Note : skb->ip_defrag_offset and skb->sk share the same location */
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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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/* Makes sure compiler wont do silly aliasing games */
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barrier();
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skb->ip_defrag_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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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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add_frag_mem_limit(fq->q.net, skb->truesize);
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fragsize = -skb_network_offset(skb) + skb->len;
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if (fragsize > fq->q.max_size)
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fq->q.max_size = fragsize;
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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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if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
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fq->q.meat == fq->q.len) {
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int res;
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unsigned long orefdst = skb->_skb_refdst;
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skb->_skb_refdst = 0UL;
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res = ip6_frag_reasm(fq, prev, dev);
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skb->_skb_refdst = orefdst;
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return res;
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}
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skb_dst_drop(skb);
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return -1;
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discard_fq:
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inet_frag_kill(&fq->q);
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err:
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__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
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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 net *net = container_of(fq->q.net, struct net, ipv6.frags);
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struct sk_buff *fp, *head = fq->q.fragments;
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int payload_len, delta;
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unsigned int nhoff;
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int sum_truesize;
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u8 ecn;
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inet_frag_kill(&fq->q);
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ecn = ip_frag_ecn_table[fq->ecn];
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if (unlikely(ecn == 0xff))
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goto out_fail;
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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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if (!fp->next)
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fq->q.fragments_tail = fp;
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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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consume_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(head->ip_defrag_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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delta = - head->truesize;
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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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goto out_oom;
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delta += head->truesize;
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if (delta)
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add_frag_mem_limit(fq->q.net, delta);
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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)
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goto out_oom;
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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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/* 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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nhoff = fq->nhoffset;
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skb_network_header(head)[nhoff] = 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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if (skb_mac_header_was_set(head))
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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_reset_transport_header(head);
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skb_push(head, head->data - skb_network_header(head));
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sum_truesize = head->truesize;
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for (fp = head->next; fp;) {
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bool headstolen;
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int delta;
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struct sk_buff *next = fp->next;
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sum_truesize += fp->truesize;
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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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if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
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kfree_skb_partial(fp, headstolen);
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} else {
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fp->sk = NULL;
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if (!skb_shinfo(head)->frag_list)
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skb_shinfo(head)->frag_list = fp;
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head->data_len += fp->len;
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head->len += fp->len;
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head->truesize += fp->truesize;
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}
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fp = next;
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}
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sub_frag_mem_limit(fq->q.net, sum_truesize);
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skb_mark_not_on_list(head);
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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)->nhoff = nhoff;
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IP6CB(head)->flags |= IP6SKB_FRAGMENTED;
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IP6CB(head)->frag_max_size = fq->q.max_size;
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/* Yes, and fold redundant checksum back. 8) */
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skb_postpush_rcsum(head, skb_network_header(head),
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skb_network_header_len(head));
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rcu_read_lock();
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__IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
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rcu_read_unlock();
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fq->q.fragments = NULL;
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fq->q.rb_fragments = RB_ROOT;
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fq->q.fragments_tail = NULL;
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return 1;
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out_oversize:
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net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len);
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goto out_fail;
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out_oom:
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net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
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out_fail:
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rcu_read_lock();
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__IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
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rcu_read_unlock();
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inet_frag_kill(&fq->q);
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return -1;
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}
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static int ipv6_frag_rcv(struct sk_buff *skb)
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{
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struct frag_hdr *fhdr;
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struct frag_queue *fq;
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const struct ipv6hdr *hdr = ipv6_hdr(skb);
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struct net *net = dev_net(skb_dst(skb)->dev);
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int iif;
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if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
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goto fail_hdr;
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__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
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/* Jumbo payload inhibits frag. header */
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if (hdr->payload_len == 0)
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goto fail_hdr;
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if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
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sizeof(struct frag_hdr))))
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goto fail_hdr;
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hdr = ipv6_hdr(skb);
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fhdr = (struct frag_hdr *)skb_transport_header(skb);
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if (!(fhdr->frag_off & htons(0xFFF9))) {
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/* It is not a fragmented frame */
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skb->transport_header += sizeof(struct frag_hdr);
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__IP6_INC_STATS(net,
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ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
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IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
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IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
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return 1;
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}
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if (skb->len - skb_network_offset(skb) < IPV6_MIN_MTU &&
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fhdr->frag_off & htons(IP6_MF))
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goto fail_hdr;
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iif = skb->dev ? skb->dev->ifindex : 0;
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fq = fq_find(net, fhdr->identification, hdr, iif);
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if (fq) {
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u32 prob_offset = 0;
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int ret;
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spin_lock(&fq->q.lock);
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fq->iif = iif;
|
|
ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff,
|
|
&prob_offset);
|
|
|
|
spin_unlock(&fq->q.lock);
|
|
inet_frag_put(&fq->q);
|
|
if (prob_offset) {
|
|
__IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
|
|
IPSTATS_MIB_INHDRERRORS);
|
|
icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, prob_offset);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
|
|
kfree_skb(skb);
|
|
return -1;
|
|
|
|
fail_hdr:
|
|
__IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
|
|
IPSTATS_MIB_INHDRERRORS);
|
|
icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
|
|
return -1;
|
|
}
|
|
|
|
static const 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[] = {
|
|
{
|
|
.procname = "ip6frag_high_thresh",
|
|
.data = &init_net.ipv6.frags.high_thresh,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
.extra1 = &init_net.ipv6.frags.low_thresh
|
|
},
|
|
{
|
|
.procname = "ip6frag_low_thresh",
|
|
.data = &init_net.ipv6.frags.low_thresh,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
.extra2 = &init_net.ipv6.frags.high_thresh
|
|
},
|
|
{
|
|
.procname = "ip6frag_time",
|
|
.data = &init_net.ipv6.frags.timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
/* secret interval has been deprecated */
|
|
static int ip6_frags_secret_interval_unused;
|
|
static struct ctl_table ip6_frags_ctl_table[] = {
|
|
{
|
|
.procname = "ip6frag_secret_interval",
|
|
.data = &ip6_frags_secret_interval_unused,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int __net_init 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_eq(net, &init_net)) {
|
|
table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
|
|
if (!table)
|
|
goto err_alloc;
|
|
|
|
table[0].data = &net->ipv6.frags.high_thresh;
|
|
table[0].extra1 = &net->ipv6.frags.low_thresh;
|
|
table[1].data = &net->ipv6.frags.low_thresh;
|
|
table[1].extra2 = &net->ipv6.frags.high_thresh;
|
|
table[2].data = &net->ipv6.frags.timeout;
|
|
}
|
|
|
|
hdr = register_net_sysctl(net, "net/ipv6", table);
|
|
if (!hdr)
|
|
goto err_reg;
|
|
|
|
net->ipv6.sysctl.frags_hdr = hdr;
|
|
return 0;
|
|
|
|
err_reg:
|
|
if (!net_eq(net, &init_net))
|
|
kfree(table);
|
|
err_alloc:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void __net_exit 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);
|
|
if (!net_eq(net, &init_net))
|
|
kfree(table);
|
|
}
|
|
|
|
static struct ctl_table_header *ip6_ctl_header;
|
|
|
|
static int ip6_frags_sysctl_register(void)
|
|
{
|
|
ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6",
|
|
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 int ip6_frags_ns_sysctl_register(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void ip6_frags_ns_sysctl_unregister(struct net *net)
|
|
{
|
|
}
|
|
|
|
static int ip6_frags_sysctl_register(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void ip6_frags_sysctl_unregister(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int __net_init ipv6_frags_init_net(struct net *net)
|
|
{
|
|
int res;
|
|
|
|
net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
|
|
net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
|
|
net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
|
|
net->ipv6.frags.f = &ip6_frags;
|
|
|
|
res = inet_frags_init_net(&net->ipv6.frags);
|
|
if (res < 0)
|
|
return res;
|
|
|
|
res = ip6_frags_ns_sysctl_register(net);
|
|
if (res < 0)
|
|
inet_frags_exit_net(&net->ipv6.frags);
|
|
return res;
|
|
}
|
|
|
|
static void __net_exit ipv6_frags_exit_net(struct net *net)
|
|
{
|
|
ip6_frags_ns_sysctl_unregister(net);
|
|
inet_frags_exit_net(&net->ipv6.frags);
|
|
}
|
|
|
|
static struct pernet_operations ip6_frags_ops = {
|
|
.init = ipv6_frags_init_net,
|
|
.exit = ipv6_frags_exit_net,
|
|
};
|
|
|
|
static const struct rhashtable_params ip6_rhash_params = {
|
|
.head_offset = offsetof(struct inet_frag_queue, node),
|
|
.hashfn = ip6frag_key_hashfn,
|
|
.obj_hashfn = ip6frag_obj_hashfn,
|
|
.obj_cmpfn = ip6frag_obj_cmpfn,
|
|
.automatic_shrinking = true,
|
|
};
|
|
|
|
int __init ipv6_frag_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ip6_frags.constructor = ip6frag_init;
|
|
ip6_frags.destructor = NULL;
|
|
ip6_frags.qsize = sizeof(struct frag_queue);
|
|
ip6_frags.frag_expire = ip6_frag_expire;
|
|
ip6_frags.frags_cache_name = ip6_frag_cache_name;
|
|
ip6_frags.rhash_params = ip6_rhash_params;
|
|
ret = inet_frags_init(&ip6_frags);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
|
|
if (ret)
|
|
goto err_protocol;
|
|
|
|
ret = ip6_frags_sysctl_register();
|
|
if (ret)
|
|
goto err_sysctl;
|
|
|
|
ret = register_pernet_subsys(&ip6_frags_ops);
|
|
if (ret)
|
|
goto err_pernet;
|
|
|
|
out:
|
|
return ret;
|
|
|
|
err_pernet:
|
|
ip6_frags_sysctl_unregister();
|
|
err_sysctl:
|
|
inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
|
|
err_protocol:
|
|
inet_frags_fini(&ip6_frags);
|
|
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);
|
|
}
|