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bpf/flow_dissector: support ipv6 flow_label and BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL

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Add support for exporting ipv6 flow label via bpf_flow_keys.
Export flow label from bpf_flow.c and also return early when
BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL is passed.

Acked-by: Petar Penkov <ppenkov@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Petar Penkov <ppenkov@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Stanislav Fomichev
2019-07-25 15:52:30 -07:00
committed by Alexei Starovoitov
parent ae173a9157
commit 71c99e32b9
5 changed files with 67 additions and 0 deletions
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10
tools/testing/selftests/bpf/progs/bpf_flow.c
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@@ -83,6 +83,12 @@ static __always_inline int export_flow_keys(struct bpf_flow_keys *keys,
return ret;
}
#define IPV6_FLOWLABEL_MASK __bpf_constant_htonl(0x000FFFFF)
static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
{
return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
}
static __always_inline void *bpf_flow_dissect_get_header(struct __sk_buff *skb,
__u16 hdr_size,
void *buffer)
@@ -308,6 +314,10 @@ PROG(IPV6)(struct __sk_buff *skb)
keys->thoff += sizeof(struct ipv6hdr);
keys->ip_proto = ip6h->nexthdr;
keys->flow_label = ip6_flowlabel(ip6h);
if (keys->flags & BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)
return export_flow_keys(keys, BPF_OK);
return parse_ipv6_proto(skb, ip6h->nexthdr);
}