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| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2014-09-12 14:04:43 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-09-13 23:07:21 +0200 |
| commit | 233577a22089facf5271ab5e845b2262047c971f (patch) | |
| tree | c93ec43dbf3adb316b3af67a3d315984b3cc5f10 /arch/mips/net/bpf_jit.c | |
| parent | net: dsa: change tag_protocol to an enum (diff) | |
| download | linux-233577a22089facf5271ab5e845b2262047c971f.tar.xz linux-233577a22089facf5271ab5e845b2262047c971f.zip | |
net: filter: constify detection of pkt_type_offset
Currently we have 2 pkt_type_offset functions doing the same thing and
spread across the architecture files. Remove those and replace them
with a PKT_TYPE_OFFSET macro helper which gets the constant value from a
zero sized sk_buff member right in front of the bitfield with offsetof.
This new offset marker does not change size of struct sk_buff.
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Daniel Borkmann <dborkman@redhat.com>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/mips/net/bpf_jit.c')
| -rw-r--r-- | arch/mips/net/bpf_jit.c | 27 |
1 files changed, 1 insertions, 26 deletions
diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c index 0e97ccd29fe3..7edc08398c4a 100644 --- a/arch/mips/net/bpf_jit.c +++ b/arch/mips/net/bpf_jit.c @@ -765,27 +765,6 @@ static u64 jit_get_skb_w(struct sk_buff *skb, unsigned offset) return (u64)err << 32 | ntohl(ret); } -#ifdef __BIG_ENDIAN_BITFIELD -#define PKT_TYPE_MAX (7 << 5) -#else -#define PKT_TYPE_MAX 7 -#endif -static int pkt_type_offset(void) -{ - struct sk_buff skb_probe = { - .pkt_type = ~0, - }; - u8 *ct = (u8 *)&skb_probe; - unsigned int off; - - for (off = 0; off < sizeof(struct sk_buff); off++) { - if (ct[off] == PKT_TYPE_MAX) - return off; - } - pr_err_once("Please fix pkt_type_offset(), as pkt_type couldn't be found\n"); - return -1; -} - static int build_body(struct jit_ctx *ctx) { void *load_func[] = {jit_get_skb_b, jit_get_skb_h, jit_get_skb_w}; @@ -1332,11 +1311,7 @@ jmp_cmp: case BPF_ANC | SKF_AD_PKTTYPE: ctx->flags |= SEEN_SKB; - off = pkt_type_offset(); - - if (off < 0) - return -1; - emit_load_byte(r_tmp, r_skb, off, ctx); + emit_load_byte(r_tmp, r_skb, PKT_TYPE_OFFSET(), ctx); /* Keep only the last 3 bits */ emit_andi(r_A, r_tmp, PKT_TYPE_MAX, ctx); #ifdef __BIG_ENDIAN_BITFIELD |