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xfrm6: handling fragment

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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 <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel 2008-11-01 21:12:07 -07:00 committed by David S. Miller
parent e25cf4a694
commit 7e3a42a12c
1 changed files with 6 additions and 3 deletions
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9
net/ipv6/xfrm6_policy.c
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@ -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;