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Commit 8760ce58 authored by John W. Linville's avatar John W. Linville Committed by David S. Miller
Browse files

geneve: allow user to specify TTL for tunnel frames 



Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ff43c28a

drivers/net/geneve.c

+14 −4
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ struct geneve_dev { 
	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                 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 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 
	struct flowi4 fl4;

	int err;

	__be16 sport;

	__u8 tos, ttl = 0;

	__u8 tos, ttl;



	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;

	}



	/* 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 void geneve_setup(struct net_device *dev) 
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 @@ static int geneve_newlink(struct net *net, struct net_device *dev, 
	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 @@ static size_t geneve_get_size(const struct net_device *dev) 
{

	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 @@ static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 
			    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:

include/uapi/linux/if_link.h

+1 −0
Original line number Diff line number Diff line
@@ -395,6 +395,7 @@ enum { 
	IFLA_GENEVE_UNSPEC,

	IFLA_GENEVE_ID,

	IFLA_GENEVE_REMOTE,

	IFLA_GENEVE_TTL,

	__IFLA_GENEVE_MAX

};

#define IFLA_GENEVE_MAX	(__IFLA_GENEVE_MAX - 1)