From 7e3a42a12c4b9d99bfe81cb929cadf0e08a37c49 Mon Sep 17 00:00:00 2001 From: Nicolas Dichtel Date: Sat, 1 Nov 2008 21:12:07 -0700 Subject: [PATCH] xfrm6: handling fragment RFC4301 Section 7.1 says: "7.1. Tunnel Mode SAs that Carry Initial and Non-Initial Fragments All implementations MUST support tunnel mode SAs that are configured to pass traffic without regard to port field (or ICMP type/code or Mobility Header type) values. If the SA will carry traffic for specified protocols, the selector set for the SA MUST specify the port fields (or ICMP type/code or Mobility Header type) as ANY. An SA defined in this fashion will carry all traffic including initial and non-initial fragments for the indicated Local/Remote addresses and specified Next Layer protocol(s)." But for IPv6, fragment is treated as a protocol. This change catches protocol transported in fragmented packet. In IPv4, there is no problem. Signed-off-by: Nicolas Dichtel Signed-off-by: David S. Miller --- net/ipv6/xfrm6_policy.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c index 08e4cbbe3f04..604bc0a96c05 100644 --- a/net/ipv6/xfrm6_policy.c +++ b/net/ipv6/xfrm6_policy.c @@ -144,6 +144,7 @@ static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) static inline void _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) { + int onlyproto = 0; u16 offset = skb_network_header_len(skb); struct ipv6hdr *hdr = ipv6_hdr(skb); struct ipv6_opt_hdr *exthdr; @@ -159,6 +160,8 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) exthdr = (struct ipv6_opt_hdr *)(nh + offset); switch (nexthdr) { + case NEXTHDR_FRAGMENT: + onlyproto = 1; case NEXTHDR_ROUTING: case NEXTHDR_HOP: case NEXTHDR_DEST: @@ -172,7 +175,7 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) case IPPROTO_TCP: case IPPROTO_SCTP: case IPPROTO_DCCP: - if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) { + if (!onlyproto && pskb_may_pull(skb, nh + offset + 4 - skb->data)) { __be16 *ports = (__be16 *)exthdr; fl->fl_ip_sport = ports[!!reverse]; @@ -182,7 +185,7 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) return; case IPPROTO_ICMPV6: - if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) { + if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) { u8 *icmp = (u8 *)exthdr; fl->fl_icmp_type = icmp[0]; @@ -193,7 +196,7 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) case IPPROTO_MH: - if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) { + if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) { struct ip6_mh *mh; mh = (struct ip6_mh *)exthdr; -- GitLab