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nfp: flower: extract ipv4 udp tunnel ttl from route 

Previously the ttl for ipv4 udp tunnels was set to the namespace default.
Modify this to attempt to extract the ttl from a full route lookup on the
tunnel destination. If this is not possible then resort to the default.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Hurley 2018-06-29 17:04:40 -07:00 committed by David S. Miller
parent ed8f2b52b6
commit ed21b637e9
1 changed files with 18 additions and 1 deletions
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19
drivers/net/ethernet/netronome/nfp/flower/action.c
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@ -236,9 +236,12 @@ nfp_fl_set_ipv4_udp_tun(struct nfp_fl_set_ipv4_udp_tun *set_tun,
size_t act_size = sizeof(struct nfp_fl_set_ipv4_udp_tun);
struct ip_tunnel_info *ip_tun = tcf_tunnel_info(action);
u32 tmp_set_ip_tun_type_index = 0;
struct flowi4 flow = {};
/* Currently support one pre-tunnel so index is always 0. */
int pretun_idx = 0;
struct rtable *rt;
struct net *net;
int err;
if (ip_tun->options_len)
return -EOPNOTSUPP;
@ -255,7 +258,21 @@ nfp_fl_set_ipv4_udp_tun(struct nfp_fl_set_ipv4_udp_tun *set_tun,
set_tun->tun_type_index = cpu_to_be32(tmp_set_ip_tun_type_index);
set_tun->tun_id = ip_tun->key.tun_id;
set_tun->ttl = net->ipv4.sysctl_ip_default_ttl;
/* Do a route lookup to determine ttl - if fails then use default.
* Note that CONFIG_INET is a requirement of CONFIG_NET_SWITCHDEV so
* must be defined here.
*/
flow.daddr = ip_tun->key.u.ipv4.dst;
flow.flowi4_proto = IPPROTO_UDP;
rt = ip_route_output_key(net, &flow);
err = PTR_ERR_OR_ZERO(rt);
if (!err) {
set_tun->ttl = ip4_dst_hoplimit(&rt->dst);
ip_rt_put(rt);
} else {
set_tun->ttl = net->ipv4.sysctl_ip_default_ttl;
}
/* Complete pre_tunnel action. */
pre_tun->ipv4_dst = ip_tun->key.u.ipv4.dst;