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| author |  Martin KaFai Lau <martin.lau@kernel.org>
| 2023-02-17 12:55:14 -0800 |
|---|---|---|
| committer |  Daniel Borkmann <daniel@iogearbox.net>
| 2023-02-17 22:12:04 +0100 |
| commit | 31de4105f00d64570139bc5494a201b0bd57349f (patch) | |
| tree | 16b85d933eb7572af8530eb3a2d1dcd04f8f816d /tools/include | |
| parent | riscv, bpf: Add bpf trampoline support for RV64 (diff) | |
| download | linux-31de4105f00d64570139bc5494a201b0bd57349f.tar.gz linux-31de4105f00d64570139bc5494a201b0bd57349f.tar.bz2 linux-31de4105f00d64570139bc5494a201b0bd57349f.zip | |
bpf: Add BPF_FIB_LOOKUP_SKIP_NEIGH for bpf_fib_lookup
The bpf_fib_lookup() also looks up the neigh table.
This was done before bpf_redirect_neigh() was added.
In the use case that does not manage the neigh table
and requires bpf_fib_lookup() to lookup a fib to
decide if it needs to redirect or not, the bpf prog can
depend only on using bpf_redirect_neigh() to lookup the
neigh. It also keeps the neigh entries fresh and connected.
This patch adds a bpf_fib_lookup flag, SKIP_NEIGH, to avoid
the double neigh lookup when the bpf prog always call
bpf_redirect_neigh() to do the neigh lookup. The params->smac
output is skipped together when SKIP_NEIGH is set because
bpf_redirect_neigh() will figure out the smac also.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230217205515.3583372-1-martin.lau@linux.dev
Diffstat (limited to 'tools/include')
| -rw-r--r-- | tools/include/uapi/linux/bpf.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 1503f61336b6..62ce1f5d1b1d 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -3134,6 +3134,11 @@ union bpf_attr { * **BPF_FIB_LOOKUP_OUTPUT** * Perform lookup from an egress perspective (default is * ingress). + * **BPF_FIB_LOOKUP_SKIP_NEIGH** + * Skip the neighbour table lookup. *params*->dmac + * and *params*->smac will not be set as output. A common + * use case is to call **bpf_redirect_neigh**\ () after + * doing **bpf_fib_lookup**\ (). * * *ctx* is either **struct xdp_md** for XDP programs or * **struct sk_buff** tc cls_act programs. @@ -6750,6 +6755,7 @@ struct bpf_raw_tracepoint_args { enum { BPF_FIB_LOOKUP_DIRECT = (1U << 0), BPF_FIB_LOOKUP_OUTPUT = (1U << 1), + BPF_FIB_LOOKUP_SKIP_NEIGH = (1U << 2), }; enum { |