netdev - [PATCH bpf-next] bpf: flowlabel in bpf_fib

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Date:   Sun,  3 Jun 2018 08:15:19 -0700
From:   dsahern@...nel.org
To:     netdev@...r.kernel.org, borkmann@...earbox.net, ast@...nel.org
Cc:     David Ahern <dsahern@...il.com>, Michal Kubecek <mkubecek@...e.cz>
Subject: [PATCH bpf-next] bpf: flowlabel in bpf_fib_lookup should be flowinfo

From: David Ahern <dsahern@...il.com>

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@...e.cz>
Signed-off-by: David Ahern <dsahern@...il.com>
---
 include/uapi/linux/bpf.h   | 2 +-
 net/core/filter.c          | 2 +-
 samples/bpf/xdp_fwd_kern.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index f0b6608b1f1c..5ef032bc4746 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -2623,7 +2623,7 @@ 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 28e864777c0f..704d515de2df 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4222,7 +4222,7 @@ 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 4a6be0f87505..6673cdb9f55c 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;
-- 
2.11.0