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| author |   Daniel Borkmann <daniel@iogearbox.net> | 2016-09-09 02:45:30 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-09-09 19:36:04 -0700 |
| commit | 374fb54eeaaa6b2cb82bca73a11273687bb2a96a (patch) | |
| tree | 3521b6faa6bf34b90ad0c4b8b733a018e858c119 /net/core/filter.c | |
| parent | bpf: add BPF_SIZEOF and BPF_FIELD_SIZEOF macros (diff) | |
| download | linux-dev-374fb54eeaaa6b2cb82bca73a11273687bb2a96a.tar.xz linux-dev-374fb54eeaaa6b2cb82bca73a11273687bb2a96a.zip | |
bpf: add own ctx rewriter on ifindex for clsact progs
When fetching ifindex, we don't need to test dev for being NULL since
we're always guaranteed to have a valid dev for clsact programs. Thus,
avoid this test in fast path.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/filter.c')
| -rw-r--r-- | net/core/filter.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 120c813ef030..d6d9bb89ce3a 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -2634,10 +2634,10 @@ void bpf_warn_invalid_xdp_action(u32 act) } EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); -static u32 bpf_net_convert_ctx_access(enum bpf_access_type type, int dst_reg, - int src_reg, int ctx_off, - struct bpf_insn *insn_buf, - struct bpf_prog *prog) +static u32 sk_filter_convert_ctx_access(enum bpf_access_type type, int dst_reg, + int src_reg, int ctx_off, + struct bpf_insn *insn_buf, + struct bpf_prog *prog) { struct bpf_insn *insn = insn_buf; @@ -2785,6 +2785,31 @@ static u32 bpf_net_convert_ctx_access(enum bpf_access_type type, int dst_reg, return insn - insn_buf; } +static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, int dst_reg, + int src_reg, int ctx_off, + struct bpf_insn *insn_buf, + struct bpf_prog *prog) +{ + struct bpf_insn *insn = insn_buf; + + switch (ctx_off) { + case offsetof(struct __sk_buff, ifindex): + BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4); + + *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), + dst_reg, src_reg, + offsetof(struct sk_buff, dev)); + *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, dst_reg, + offsetof(struct net_device, ifindex)); + break; + default: + return sk_filter_convert_ctx_access(type, dst_reg, src_reg, + ctx_off, insn_buf, prog); + } + + return insn - insn_buf; +} + static u32 xdp_convert_ctx_access(enum bpf_access_type type, int dst_reg, int src_reg, int ctx_off, struct bpf_insn *insn_buf, @@ -2811,13 +2836,13 @@ static u32 xdp_convert_ctx_access(enum bpf_access_type type, int dst_reg, static const struct bpf_verifier_ops sk_filter_ops = { .get_func_proto = sk_filter_func_proto, .is_valid_access = sk_filter_is_valid_access, - .convert_ctx_access = bpf_net_convert_ctx_access, + .convert_ctx_access = sk_filter_convert_ctx_access, }; static const struct bpf_verifier_ops tc_cls_act_ops = { .get_func_proto = tc_cls_act_func_proto, .is_valid_access = tc_cls_act_is_valid_access, - .convert_ctx_access = bpf_net_convert_ctx_access, + .convert_ctx_access = tc_cls_act_convert_ctx_access, }; static const struct bpf_verifier_ops xdp_ops = { |