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bpf: ipv4: Prepare __bpf_redirect_neigh_v4() to future .flowi4_tos conversion.

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Use ip4h_dscp() to get the DSCP from the IPv4 header, then convert the
dscp_t value to __u8 with inet_dscp_to_dsfield().

Then, when we'll convert .flowi4_tos to dscp_t, we'll just have to drop
the inet_dscp_to_dsfield() call.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/35eacc8955003e434afb1365d404193cc98a9579.1731064982.git.gnault@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Guillaume Nault 2024-11-08 17:47:12 +01:00 committed by Jakub Kicinski
parent 59b6c043da
commit bfe086be5c
1 changed files with 1 additions and 1 deletions
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2
net/core/filter.c
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@ -2355,7 +2355,7 @@ static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev,
struct flowi4 fl4 = {
.flowi4_flags = FLOWI_FLAG_ANYSRC,
.flowi4_mark = skb->mark,
.flowi4_tos = ip4h->tos & INET_DSCP_MASK,
.flowi4_tos = inet_dscp_to_dsfield(ip4h_dscp(ip4h)),
.flowi4_oif = dev->ifindex,
.flowi4_proto = ip4h->protocol,
.daddr = ip4h->daddr,