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335c8cf3b5
A latter patch will postpone the delivery_time clearing until the stack knows the skb is being delivered locally (i.e. calling skb_clear_delivery_time() at ip_local_deliver_finish() for IPv4 and at ip6_input_finish() for IPv6). That will allow other kernel forwarding path (e.g. ip[6]_forward) to keep the delivery_time also. A very similar IPv6 defrag codes have been duplicated in multiple places: regular IPv6, nf_conntrack, and 6lowpan. Unlike the IPv4 defrag which is done before ip_local_deliver_finish(), the regular IPv6 defrag is done after ip6_input_finish(). Thus, no change should be needed in the regular IPv6 defrag logic because skb_clear_delivery_time() should have been called. 6lowpan also does not need special handling on delivery_time because it is a non-inet packet_type. However, cf_conntrack has a case in NF_INET_PRE_ROUTING that needs to do the IPv6 defrag earlier. Thus, it needs to save the mono_delivery_time bit in the inet_frag_queue which is similar to how it is handled in the previous patch for the IPv4 defrag. This patch chooses to do it consistently and stores the mono_delivery_time in the inet_frag_queue for all cases such that it will be easier for the future refactoring effort on the IPv6 reasm code. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
613 lines
15 KiB
C
613 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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/*
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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 <linux/tcp.h>
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#include <linux/udp.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 *skb,
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struct sk_buff *prev_tail, 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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fq = container_of(frag, struct frag_queue, q);
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ip6frag_expire_frag_queue(fq->q.fqdir->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.fqdir, &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 net *net = dev_net(skb_dst(skb)->dev);
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int offset, end, fragsize;
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struct sk_buff *prev_tail;
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struct net_device *dev;
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int err = -ENOENT;
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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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err = -EINVAL;
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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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/* note that if prob_offset is set, the skb is freed elsewhere,
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* we do not free it here.
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*/
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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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err = -ENOMEM;
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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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err = pskb_trim_rcsum(skb, end - offset);
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if (err)
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goto discard_fq;
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/* Note : skb->rbnode and skb->dev share the same location. */
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dev = skb->dev;
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/* Makes sure compiler wont do silly aliasing games */
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barrier();
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prev_tail = fq->q.fragments_tail;
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err = inet_frag_queue_insert(&fq->q, skb, offset, end);
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if (err)
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goto insert_error;
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if (dev)
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fq->iif = dev->ifindex;
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fq->q.stamp = skb->tstamp;
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fq->q.mono_delivery_time = skb->mono_delivery_time;
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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.fqdir, 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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unsigned long orefdst = skb->_skb_refdst;
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skb->_skb_refdst = 0UL;
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err = ip6_frag_reasm(fq, skb, prev_tail, dev);
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skb->_skb_refdst = orefdst;
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return err;
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}
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skb_dst_drop(skb);
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return -EINPROGRESS;
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insert_error:
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if (err == IPFRAG_DUP) {
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kfree_skb(skb);
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return -EINVAL;
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}
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err = -EINVAL;
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__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
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IPSTATS_MIB_REASM_OVERLAPS);
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discard_fq:
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inet_frag_kill(&fq->q);
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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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err:
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kfree_skb(skb);
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return err;
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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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static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb,
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struct sk_buff *prev_tail, struct net_device *dev)
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{
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struct net *net = fq->q.fqdir->net;
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unsigned int nhoff;
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void *reasm_data;
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int payload_len;
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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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reasm_data = inet_frag_reasm_prepare(&fq->q, skb, prev_tail);
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if (!reasm_data)
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goto out_oom;
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payload_len = ((skb->data - skb_network_header(skb)) -
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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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/* 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(skb)[nhoff] = skb_transport_header(skb)[0];
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memmove(skb->head + sizeof(struct frag_hdr), skb->head,
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(skb->data - skb->head) - sizeof(struct frag_hdr));
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if (skb_mac_header_was_set(skb))
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skb->mac_header += sizeof(struct frag_hdr);
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skb->network_header += sizeof(struct frag_hdr);
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skb_reset_transport_header(skb);
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inet_frag_reasm_finish(&fq->q, skb, reasm_data, true);
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skb->dev = dev;
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ipv6_hdr(skb)->payload_len = htons(payload_len);
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ipv6_change_dsfield(ipv6_hdr(skb), 0xff, ecn);
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IP6CB(skb)->nhoff = nhoff;
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IP6CB(skb)->flags |= IP6SKB_FRAGMENTED;
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IP6CB(skb)->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(skb, skb_network_header(skb),
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skb_network_header_len(skb));
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rcu_read_lock();
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__IP6_INC_STATS(net, __in6_dev_stats_get(dev, skb), IPSTATS_MIB_REASMOKS);
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rcu_read_unlock();
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fq->q.rb_fragments = RB_ROOT;
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fq->q.fragments_tail = NULL;
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fq->q.last_run_head = 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_stats_get(dev, skb), 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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u8 nexthdr;
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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(IP6_OFFSET | IP6_MF))) {
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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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IP6CB(skb)->frag_max_size = ntohs(hdr->payload_len) +
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sizeof(struct ipv6hdr);
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return 1;
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}
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/* RFC 8200, Section 4.5 Fragment Header:
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* If the first fragment does not include all headers through an
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* Upper-Layer header, then that fragment should be discarded and
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* an ICMP Parameter Problem, Code 3, message should be sent to
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* the source of the fragment, with the Pointer field set to zero.
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*/
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nexthdr = hdr->nexthdr;
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if (ipv6frag_thdr_truncated(skb, skb_transport_offset(skb), &nexthdr)) {
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__IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
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IPSTATS_MIB_INHDRERRORS);
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icmpv6_param_prob(skb, ICMPV6_HDR_INCOMP, 0);
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return -1;
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}
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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;
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ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff,
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&prob_offset);
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spin_unlock(&fq->q.lock);
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inet_frag_put(&fq->q);
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if (prob_offset) {
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__IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
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IPSTATS_MIB_INHDRERRORS);
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/* icmpv6_param_prob() calls kfree_skb(skb) */
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icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, prob_offset);
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}
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return ret;
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}
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__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
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kfree_skb(skb);
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return -1;
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fail_hdr:
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__IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
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IPSTATS_MIB_INHDRERRORS);
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icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
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return -1;
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}
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static const struct inet6_protocol frag_protocol = {
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.handler = ipv6_frag_rcv,
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.flags = INET6_PROTO_NOPOLICY,
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};
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#ifdef CONFIG_SYSCTL
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static struct ctl_table ip6_frags_ns_ctl_table[] = {
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{
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.procname = "ip6frag_high_thresh",
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_minmax,
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},
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{
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.procname = "ip6frag_low_thresh",
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_minmax,
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},
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{
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.procname = "ip6frag_time",
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.maxlen = sizeof(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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};
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/* secret interval has been deprecated */
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static int ip6_frags_secret_interval_unused;
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static struct ctl_table ip6_frags_ctl_table[] = {
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{
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.procname = "ip6frag_secret_interval",
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.data = &ip6_frags_secret_interval_unused,
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.maxlen = sizeof(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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};
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static int __net_init ip6_frags_ns_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 = 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.fqdir->high_thresh;
|
|
table[0].extra1 = &net->ipv6.fqdir->low_thresh;
|
|
table[1].data = &net->ipv6.fqdir->low_thresh;
|
|
table[1].extra2 = &net->ipv6.fqdir->high_thresh;
|
|
table[2].data = &net->ipv6.fqdir->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;
|
|
|
|
res = fqdir_init(&net->ipv6.fqdir, &ip6_frags, net);
|
|
if (res < 0)
|
|
return res;
|
|
|
|
net->ipv6.fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH;
|
|
net->ipv6.fqdir->low_thresh = IPV6_FRAG_LOW_THRESH;
|
|
net->ipv6.fqdir->timeout = IPV6_FRAG_TIMEOUT;
|
|
|
|
res = ip6_frags_ns_sysctl_register(net);
|
|
if (res < 0)
|
|
fqdir_exit(net->ipv6.fqdir);
|
|
return res;
|
|
}
|
|
|
|
static void __net_exit ipv6_frags_pre_exit_net(struct net *net)
|
|
{
|
|
fqdir_pre_exit(net->ipv6.fqdir);
|
|
}
|
|
|
|
static void __net_exit ipv6_frags_exit_net(struct net *net)
|
|
{
|
|
ip6_frags_ns_sysctl_unregister(net);
|
|
fqdir_exit(net->ipv6.fqdir);
|
|
}
|
|
|
|
static struct pernet_operations ip6_frags_ops = {
|
|
.init = ipv6_frags_init_net,
|
|
.pre_exit = ipv6_frags_pre_exit_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)
|
|
{
|
|
ip6_frags_sysctl_unregister();
|
|
unregister_pernet_subsys(&ip6_frags_ops);
|
|
inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
|
|
inet_frags_fini(&ip6_frags);
|
|
}
|