bpf: flowlabel in bpf_fib_lookup should be flowinfo
As Michal noted the flow struct takes both the flow label and priority.
Update the bpf_fib_lookup API to note that it is flowinfo and not just
the flow label.
Cc: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 18712b0..eeb6237 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -2629,7 +2629,7 @@ struct bpf_fib_lookup {
union {
/* inputs to lookup */
__u8 tos; /* AF_INET */
- __be32 flowlabel; /* AF_INET6 */
+ __be32 flowinfo; /* AF_INET6, flow_label + priority */
/* output: metric of fib result (IPv4/IPv6 only) */
__u32 rt_metric;
diff --git a/net/core/filter.c b/net/core/filter.c
index a72ea9f..3d9ba7e 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4221,7 +4221,7 @@ static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
fl6.flowi6_oif = 0;
strict = RT6_LOOKUP_F_HAS_SADDR;
}
- fl6.flowlabel = params->flowlabel;
+ fl6.flowlabel = params->flowinfo;
fl6.flowi6_scope = 0;
fl6.flowi6_flags = 0;
fl6.mp_hash = 0;
diff --git a/samples/bpf/xdp_fwd_kern.c b/samples/bpf/xdp_fwd_kern.c
index 4a6be0f..6673cdb 100644
--- a/samples/bpf/xdp_fwd_kern.c
+++ b/samples/bpf/xdp_fwd_kern.c
@@ -88,7 +88,7 @@ static __always_inline int xdp_fwd_flags(struct xdp_md *ctx, u32 flags)
return XDP_PASS;
fib_params.family = AF_INET6;
- fib_params.flowlabel = *(__be32 *)ip6h & IPV6_FLOWINFO_MASK;
+ fib_params.flowinfo = *(__be32 *)ip6h & IPV6_FLOWINFO_MASK;
fib_params.l4_protocol = ip6h->nexthdr;
fib_params.sport = 0;
fib_params.dport = 0;