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bpf: lwtunnel: Prepare bpf_lwt_xmit_reroute() 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/8338a12377c44f698a651d1ce357dd92bdf18120.1731064982.git.gnault@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Guillaume Nault 2024-11-08 17:47:15 +01:00 committed by Jakub Kicinski
parent bfe086be5c
commit dab9c63071
1 changed files with 1 additions and 1 deletions
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2
net/core/lwt_bpf.c
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@ -209,7 +209,7 @@ static int bpf_lwt_xmit_reroute(struct sk_buff *skb)
fl4.flowi4_oif = oif;
fl4.flowi4_mark = skb->mark;
fl4.flowi4_uid = sock_net_uid(net, sk);
fl4.flowi4_tos = iph->tos & INET_DSCP_MASK;
fl4.flowi4_tos = inet_dscp_to_dsfield(ip4h_dscp(iph));
fl4.flowi4_flags = FLOWI_FLAG_ANYSRC;
fl4.flowi4_proto = iph->protocol;
fl4.daddr = iph->daddr;