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geneve: fix TOS inheriting for ipv4

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The current code retrieves the TOS field after the lookup
on the ipv4 routing table. The routing process currently
only allows routing based on the original 3 TOS bits, and
not on the full 6 DSCP bits.
As a result the retrieved TOS is cut to the 3 bits.
However for inheriting purposes the full 6 bits should be used.

Extract the full 6 bits before the route lookup and use
that instead of the cut off 3 TOS bits.

Fixes: e305ac6cf5 ("geneve: Add support to collect tunnel metadata.")
Signed-off-by: Matthias May <matthias.may@westermo.com>
Acked-by: Guillaume Nault <gnault@redhat.com>
Link: https://lore.kernel.org/r/20220805190006.8078-1-matthias.may@westermo.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matthias May 2022-08-05 21:00:06 +02:00 committed by Jakub Kicinski
parent 2ba5e47fb7
commit b4ab94d6ad
1 changed files with 8 additions and 4 deletions
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12
drivers/net/geneve.c
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@ -797,7 +797,8 @@ static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
struct geneve_sock *gs4,
struct flowi4 *fl4,
const struct ip_tunnel_info *info,
__be16 dport, __be16 sport)
__be16 dport, __be16 sport,
__u8 *full_tos)
{
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
struct geneve_dev *geneve = netdev_priv(dev);
@ -823,6 +824,8 @@ static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
use_cache = false;
}
fl4->flowi4_tos = RT_TOS(tos);
if (full_tos)
*full_tos = tos;
dst_cache = (struct dst_cache *)&info->dst_cache;
if (use_cache) {
@ -911,6 +914,7 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
const struct ip_tunnel_key *key = &info->key;
struct rtable *rt;
struct flowi4 fl4;
__u8 full_tos;
__u8 tos, ttl;
__be16 df = 0;
__be16 sport;
@ -921,7 +925,7 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
geneve->cfg.info.key.tp_dst, sport);
geneve->cfg.info.key.tp_dst, sport, &full_tos);
if (IS_ERR(rt))
return PTR_ERR(rt);
@ -965,7 +969,7 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
} else {
tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
tos = ip_tunnel_ecn_encap(full_tos, ip_hdr(skb), skb);
if (geneve->cfg.ttl_inherit)
ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
else
@ -1149,7 +1153,7 @@ static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1, USHRT_MAX, true);
rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
geneve->cfg.info.key.tp_dst, sport);
geneve->cfg.info.key.tp_dst, sport, NULL);
if (IS_ERR(rt))
return PTR_ERR(rt);