geneve: allow user to specify TTL for tunnel frames
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index b7eafa4..1675dfd 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -44,7 +44,8 @@
struct net *net; /* netns for packet i/o */
struct net_device *dev; /* netdev for geneve tunnel */
struct geneve_sock *sock; /* socket used for geneve tunnel */
- u8 vni[3]; /* virtual network ID for tunnel */
+ u8 vni[3]; /* virtual network ID for tunnel */
+ u8 ttl; /* TTL override */
struct sockaddr_in remote; /* IPv4 address for link partner */
struct list_head next; /* geneve's per namespace list */
};
@@ -184,7 +185,7 @@
struct flowi4 fl4;
int err;
__be16 sport;
- __u8 tos, ttl = 0;
+ __u8 tos, ttl;
iip = ip_hdr(skb);
@@ -207,11 +208,12 @@
goto rt_tx_error;
}
- /* TODO: tos and ttl should be configurable */
+ /* TODO: tos should be configurable */
tos = ip_tunnel_ecn_encap(0, iip, skb);
- if (IN_MULTICAST(ntohl(fl4.daddr)))
+ ttl = geneve->ttl;
+ if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
ttl = 1;
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
@@ -297,6 +299,7 @@
static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
[IFLA_GENEVE_ID] = { .type = NLA_U32 },
[IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
+ [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
};
static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
@@ -364,6 +367,9 @@
if (err)
return err;
+ if (data[IFLA_GENEVE_TTL])
+ geneve->ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
+
list_add(&geneve->next, &gn->geneve_list);
hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]);
@@ -386,6 +392,7 @@
{
return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
nla_total_size(sizeof(struct in_addr)) + /* IFLA_GENEVE_REMOTE */
+ nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
0;
}
@@ -402,6 +409,9 @@
geneve->remote.sin_addr.s_addr))
goto nla_put_failure;
+ if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl))
+ goto nla_put_failure;
+
return 0;
nla_put_failure: