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geneve: allow user to specify TTL for tunnel frames

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Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John W. Linville 2015-06-01 15:51:34 -04:00 • committed by David S. Miller
commit 8760ce5835
2 changed files with 15 additions and 4 deletions
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16
drivers/net/geneve.c
View file

@ -45,6 +45,7 @@ struct geneve_dev {
struct net_device *dev; /* netdev for geneve tunnel */ struct net_device *dev; /* netdev for geneve tunnel */
struct geneve_sock *sock; /* socket used 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 sockaddr_in remote; /* IPv4 address for link partner */
struct list_head next; /* geneve's per namespace list */ struct list_head next; /* geneve's per namespace list */
}; };
@ -184,7 +185,7 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
struct flowi4 fl4; struct flowi4 fl4;
int err; int err;
__be16 sport; __be16 sport;
__u8 tos, ttl = 0; __u8 tos, ttl;
iip = ip_hdr(skb); iip = ip_hdr(skb);
@ -207,11 +208,12 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
goto rt_tx_error; goto rt_tx_error;
} }
/* TODO: tos and ttl should be configurable */ /* TODO: tos should be configurable */
tos = ip_tunnel_ecn_encap(0, iip, skb); 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 = 1;
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
@ -297,6 +299,7 @@ static void geneve_setup(struct net_device *dev)
static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
[IFLA_GENEVE_ID] = { .type = NLA_U32 }, [IFLA_GENEVE_ID] = { .type = NLA_U32 },
[IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, [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[]) static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
@ -364,6 +367,9 @@ static int geneve_newlink(struct net *net, struct net_device *dev,
if (err) if (err)
return err; return err;
if (data[IFLA_GENEVE_TTL])
geneve->ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
list_add(&geneve->next, &gn->geneve_list); list_add(&geneve->next, &gn->geneve_list);
hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]); hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]);
@ -386,6 +392,7 @@ static size_t geneve_get_size(const struct net_device *dev)
{ {
return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
nla_total_size(sizeof(struct in_addr)) + /* IFLA_GENEVE_REMOTE */ nla_total_size(sizeof(struct in_addr)) + /* IFLA_GENEVE_REMOTE */
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
0; 0;
} }
@ -402,6 +409,9 @@ static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
geneve->remote.sin_addr.s_addr)) geneve->remote.sin_addr.s_addr))
goto nla_put_failure; goto nla_put_failure;
if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl))
goto nla_put_failure;
return 0; return 0;
nla_put_failure: nla_put_failure:

1
include/uapi/linux/if_link.h
View file

@ -395,6 +395,7 @@ enum {
IFLA_GENEVE_UNSPEC, IFLA_GENEVE_UNSPEC,
IFLA_GENEVE_ID, IFLA_GENEVE_ID,
IFLA_GENEVE_REMOTE, IFLA_GENEVE_REMOTE,
IFLA_GENEVE_TTL,
__IFLA_GENEVE_MAX __IFLA_GENEVE_MAX
}; };
#define IFLA_GENEVE_MAX (__IFLA_GENEVE_MAX - 1) #define IFLA_GENEVE_MAX (__IFLA_GENEVE_MAX - 1)