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ipv6: distinguish frag queues by device for multicast and link-local packets 

If a fragmented multicast packet is received on an ethernet device which
has an active macvlan on top of it, each fragment is duplicated and
received both on the underlying device and the macvlan. If some
fragments for macvlan are processed before the whole packet for the
underlying device is reassembled, the "overlapping fragments" test in
ip6_frag_queue() discards the whole fragment queue.

To resolve this, add device ifindex to the search key and require it to
match reassembling multicast packets and packets to link-local
addresses.

Note: similar patch has been already submitted by Yoshifuji Hideaki in

  http://patchwork.ozlabs.org/patch/220979/

but got lost and forgotten for some reason.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubeček 2015-11-24 15:07:11 +01:00 committed by David S. Miller
parent aeb20b6b3f
commit 264640fc2c
3 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/ipv6.h
View File

@ -490,6 +490,7 @@ struct ip6_create_arg {
u32 user;
const struct in6_addr *src;
const struct in6_addr *dst;
int iif;
u8 ecn;
};

5
net/ipv6/netfilter/nf_conntrack_reasm.c
View File

@ -190,7 +190,7 @@ static void nf_ct_frag6_expire(unsigned long data)
/* Creation primitives. */
static inline struct frag_queue *fq_find(struct net *net, __be32 id,
u32 user, struct in6_addr *src,
struct in6_addr *dst, u8 ecn)
struct in6_addr *dst, int iif, u8 ecn)
{
struct inet_frag_queue *q;
struct ip6_create_arg arg;
@ -200,6 +200,7 @@ static inline struct frag_queue *fq_find(struct net *net, __be32 id,
arg.user = user;
arg.src = src;
arg.dst = dst;
arg.iif = iif;
arg.ecn = ecn;
local_bh_disable();
@ -601,7 +602,7 @@ struct sk_buff *nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 use
fhdr = (struct frag_hdr *)skb_transport_header(clone);
fq = fq_find(net, fhdr->identification, user, &hdr->saddr, &hdr->daddr,
ip6_frag_ecn(hdr));
skb->dev ? skb->dev->ifindex : 0, ip6_frag_ecn(hdr));
if (fq == NULL) {
pr_debug("Can't find and can't create new queue\n");
goto ret_orig;

10
net/ipv6/reassembly.c
View File

@ -108,7 +108,10 @@ bool ip6_frag_match(const struct inet_frag_queue *q, const void *a)
return fq->id == arg->id &&
fq->user == arg->user &&
ipv6_addr_equal(&fq->saddr, arg->src) &&
ipv6_addr_equal(&fq->daddr, arg->dst);
ipv6_addr_equal(&fq->daddr, arg->dst) &&
(arg->iif == fq->iif ||
!(ipv6_addr_type(arg->dst) & (IPV6_ADDR_MULTICAST |
IPV6_ADDR_LINKLOCAL)));
}
EXPORT_SYMBOL(ip6_frag_match);
@ -180,7 +183,7 @@ static void ip6_frag_expire(unsigned long data)
static struct frag_queue *
fq_find(struct net *net, __be32 id, const struct in6_addr *src,
const struct in6_addr *dst, u8 ecn)
const struct in6_addr *dst, int iif, u8 ecn)
{
struct inet_frag_queue *q;
struct ip6_create_arg arg;
@ -190,6 +193,7 @@ fq_find(struct net *net, __be32 id, const struct in6_addr *src,
arg.user = IP6_DEFRAG_LOCAL_DELIVER;
arg.src = src;
arg.dst = dst;
arg.iif = iif;
arg.ecn = ecn;
hash = inet6_hash_frag(id, src, dst);
@ -551,7 +555,7 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
}
fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
ip6_frag_ecn(hdr));
skb->dev ? skb->dev->ifindex : 0, ip6_frag_ecn(hdr));
if (fq) {
int ret;