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authorStanislav Fomichev <sdf@google.com>2019-07-26 01:52:25 +0300
committerAlexei Starovoitov <ast@kernel.org>2019-07-26 04:00:41 +0300
commit086f95682114fd2d1790bd3226e76cbae9a2d192 (patch)
tree9433a08f66aee74c6bfcc5e493b41d0762a5a77e /net/core
parent03cd1d1a493e92a80d60040d6aa8160aff239942 (diff)
downloadlinux-086f95682114fd2d1790bd3226e76cbae9a2d192.tar.xz
bpf/flow_dissector: pass input flags to BPF flow dissector program
C flow dissector supports input flags that tell it to customize parsing by either stopping early or trying to parse as deep as possible. Pass those flags to the BPF flow dissector so it can make the same decisions. In the next commits I'll add support for those flags to our reference bpf_flow.c v3: * Export copy of flow dissector flags instead of moving (Alexei Starovoitov) 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>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/flow_dissector.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 3e6fedb57bc1..50ed1a688709 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -784,7 +784,7 @@ static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
}
bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
- __be16 proto, int nhoff, int hlen)
+ __be16 proto, int nhoff, int hlen, unsigned int flags)
{
struct bpf_flow_keys *flow_keys = ctx->flow_keys;
u32 result;
@@ -795,6 +795,14 @@ bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
flow_keys->nhoff = nhoff;
flow_keys->thoff = flow_keys->nhoff;
+ BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
+ (int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
+ BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
+ (int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
+ BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
+ (int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
+ flow_keys->flags = flags;
+
preempt_disable();
result = BPF_PROG_RUN(prog, ctx);
preempt_enable();
@@ -914,7 +922,7 @@ bool __skb_flow_dissect(const struct net *net,
}
ret = bpf_flow_dissect(attached, &ctx, n_proto, nhoff,
- hlen);
+ hlen, flags);
__skb_flow_bpf_to_target(&flow_keys, flow_dissector,
target_container);
rcu_read_unlock();