Add a new flowi_tunnel structure which is a subset of ip_tunnel_key
to allow routes to match on tunnel metadata. For now, the tunnel id
is added to flowi_tunnel which allows for routes to be bound to
specific virtual tunnels.
Signed-off-by: Thomas Graf <tg...@suug.ch>
---
include/net/flow.h | 7 +++++++
include/net/ip_tunnels.h | 10 ++++++++++
net/ipv4/route.c | 2 ++
3 files changed, 19 insertions(+)
diff --git a/include/net/flow.h b/include/net/flow.h
index 8109a15..c15fb5e 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -19,6 +19,10 @@
#define LOOPBACK_IFINDEX 1
+struct flowi_tunnel {
+ __be64 tun_id;
+};
+
struct flowi_common {
int flowic_oif;
int flowic_iif;
@@ -30,6 +34,7 @@ struct flowi_common {
#define FLOWI_FLAG_ANYSRC 0x01
#define FLOWI_FLAG_KNOWN_NH 0x02
__u32 flowic_secid;
+ struct flowi_tunnel flowic_tun_key;
};
union flowi_uli {
@@ -66,6 +71,7 @@ struct flowi4 {
#define flowi4_proto __fl_common.flowic_proto
#define flowi4_flags __fl_common.flowic_flags
#define flowi4_secid __fl_common.flowic_secid
+#define flowi4_tun_key __fl_common.flowic_tun_key
/* (saddr,daddr) must be grouped, same order as in IP header */
__be32 saddr;
@@ -165,6 +171,7 @@ struct flowi {
#define flowi_proto u.__fl_common.flowic_proto
#define flowi_flags u.__fl_common.flowic_flags
#define flowi_secid u.__fl_common.flowic_secid
+#define flowi_tun_key u.__fl_common.flowic_tun_key
} __attribute__((__aligned__(BITS_PER_LONG/8)));
static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 8b76ba1..df8cfd3 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -12,6 +12,7 @@
#include <net/ip.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
+#include <net/flow.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
@@ -337,6 +338,15 @@ static inline void *ip_tunnel_info_opts(struct
ip_tunnel_info *info,
return info + 1;
}
+static inline void ip_tunnel_derive_key(struct sk_buff *skb,
+ struct flowi_tunnel *key)
+{
+ struct ip_tunnel_info *tun_info = skb_shinfo(skb)->tun_info;
+
+ if (tun_info && tun_info->mode == IP_TUNNEL_INFO_RX)
+ key->tun_id = tun_info->key.tun_id;
+}
+
#endif /* CONFIG_INET */
#endif /* __NET_IP_TUNNELS_H */
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index f605598..6e8e1be 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -109,6 +109,7 @@
#include <linux/kmemleak.h>
#endif
#include <net/secure_seq.h>
+#include <net/ip_tunnels.h>
#define RT_FL_TOS(oldflp4) \
((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
@@ -1716,6 +1717,7 @@ static int ip_route_input_slow(struct sk_buff *skb,
__be32 daddr, __be32 saddr,
fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
fl4.daddr = daddr;
fl4.saddr = saddr;
+ ip_tunnel_derive_key(skb, &fl4.flowi4_tun_key);
err = fib_lookup(net, &fl4, &res);
if (err != 0) {
if (!IN_DEV_FORWARD(in_dev))
--
2.3.5
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