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| author | YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> | 2008-06-19 16:33:57 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-06-19 16:33:57 -0700 |
| commit | f630e43a215a3129d0c1173cae0bce6ea4855cf7 (patch) | |
| tree | 9bd9c07a59622dfb166624f79d2d71f7e076aa13 | |
| parent | aea7427f70cce5fa8f99ce447b213e9e3b49f24c (diff) | |
| download | linux-f630e43a215a3129d0c1173cae0bce6ea4855cf7.tar.gz linux-f630e43a215a3129d0c1173cae0bce6ea4855cf7.tar.bz2 linux-f630e43a215a3129d0c1173cae0bce6ea4855cf7.zip | |
ipv6: Drop packets for loopback address from outside of the box.
[ Based upon original report and patch by Karsten Keil. Karsten
has verified that this fixes the TAHI test case "ICMPv6 test
v6LC.5.1.2 Part F". -DaveM ]
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/net/ipv6.h | 6 | ||||
| -rw-r--r-- | net/ipv6/ip6_input.c | 9 |
2 files changed, 15 insertions, 0 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index e0a612bc9c4e..f422f7218e1c 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -367,6 +367,12 @@ static inline int ipv6_addr_any(const struct in6_addr *a) a->s6_addr32[2] | a->s6_addr32[3] ) == 0); } +static inline int ipv6_addr_loopback(const struct in6_addr *a) +{ + return ((a->s6_addr32[0] | a->s6_addr32[1] | + a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0); +} + static inline int ipv6_addr_v4mapped(const struct in6_addr *a) { return ((a->s6_addr32[0] | a->s6_addr32[1] | diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index 4e5c8615832c..17eb48b8e329 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -102,6 +102,15 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt if (hdr->version != 6) goto err; + /* + * RFC4291 2.5.3 + * A packet received on an interface with a destination address + * of loopback must be dropped. + */ + if (!(dev->flags & IFF_LOOPBACK) && + ipv6_addr_loopback(&hdr->daddr)) + goto err; + skb->transport_header = skb->network_header + sizeof(*hdr); IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |