Commit cc9ff19d authored by Timo Teräs's avatar Timo Teräs Committed by David S. Miller
Browse files

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: default avatarTimo Teräs <timo.teras@iki.fi>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e1f2d8c2
......@@ -67,6 +67,7 @@ struct flowi {
} dnports;
__be32 spi;
__be32 gre_key;
struct {
__u8 type;
......@@ -78,6 +79,7 @@ struct flowi {
#define fl_icmp_code uli_u.icmpt.code
#define fl_ipsec_spi uli_u.spi
#define fl_mh_type uli_u.mht.type
#define fl_gre_key uli_u.gre_key
__u32 secid; /* used by xfrm; see secid.txt */
} __attribute__((__aligned__(BITS_PER_LONG/8)));
......
......@@ -805,6 +805,9 @@ __be16 xfrm_flowi_sport(struct flowi *fl)
case IPPROTO_MH:
port = htons(fl->fl_mh_type);
break;
case IPPROTO_GRE:
port = htonl(fl->fl_gre_key) >> 16;
break;
default:
port = 0; /*XXX*/
}
......@@ -826,6 +829,9 @@ __be16 xfrm_flowi_dport(struct flowi *fl)
case IPPROTO_ICMPV6:
port = htons(fl->fl_icmp_code);
break;
case IPPROTO_GRE:
port = htonl(fl->fl_gre_key) & 0xffff;
break;
default:
port = 0; /*XXX*/
}
......
......@@ -779,9 +779,9 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
.tos = RT_TOS(tos)
}
},
.proto = IPPROTO_GRE
}
;
.proto = IPPROTO_GRE,
.fl_gre_key = tunnel->parms.o_key
};
if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
dev->stats.tx_carrier_errors++;
goto tx_error;
......@@ -958,7 +958,8 @@ static int ipgre_tunnel_bind_dev(struct net_device *dev)
.tos = RT_TOS(iph->tos)
}
},
.proto = IPPROTO_GRE
.proto = IPPROTO_GRE,
.fl_gre_key = tunnel->parms.o_key
};
struct rtable *rt;
......@@ -1223,7 +1224,8 @@ static int ipgre_open(struct net_device *dev)
.tos = RT_TOS(t->parms.iph.tos)
}
},
.proto = IPPROTO_GRE
.proto = IPPROTO_GRE,
.fl_gre_key = t->parms.o_key
};
struct rtable *rt;
......
......@@ -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;
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment