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| author | Timo Teräs <timo.teras@iki.fi> | 2010-11-03 04:41:38 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-11-15 10:44:04 -0800 |
| commit | cc9ff19da9bf76a2f70bcb80225a1c587c162e52 (patch) | |
| tree | 181efcd617a42a48fa94c51cfe9dc0e77b3b5775 /net/ipv4/xfrm4_policy.c | |
| parent | e1f2d8c2cc61d2b9472efe44e8a2b098336914b4 (diff) | |
| download | lwn-cc9ff19da9bf76a2f70bcb80225a1c587c162e52.tar.gz lwn-cc9ff19da9bf76a2f70bcb80225a1c587c162e52.zip | |
xfrm: use gre key as flow upper protocol info
The GRE Key field is intended to be used for identifying an individual
traffic flow within a tunnel. It is useful to be able to have XFRM
policy selector matches to have different policies for different
GRE tunnels.
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/xfrm4_policy.c')
| -rw-r--r-- | net/ipv4/xfrm4_policy.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c index dd1fd8c473fc..4a8c5335770c 100644 --- a/net/ipv4/xfrm4_policy.c +++ b/net/ipv4/xfrm4_policy.c @@ -11,6 +11,7 @@ #include <linux/err.h> #include <linux/kernel.h> #include <linux/inetdevice.h> +#include <linux/if_tunnel.h> #include <net/dst.h> #include <net/xfrm.h> #include <net/ip.h> @@ -154,6 +155,20 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse) fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1])); } break; + + case IPPROTO_GRE: + if (pskb_may_pull(skb, xprth + 12 - skb->data)) { + __be16 *greflags = (__be16 *)xprth; + __be32 *gre_hdr = (__be32 *)xprth; + + if (greflags[0] & GRE_KEY) { + if (greflags[0] & GRE_CSUM) + gre_hdr++; + fl->fl_gre_key = gre_hdr[1]; + } + } + break; + default: fl->fl_ipsec_spi = 0; break; |