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| author | Alexei Starovoitov <ast@plumgrid.com> | 2014-06-05 14:39:36 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-06-05 15:40:38 -0700 |
| commit | 0dcceabb0c1bf2d4c12a748df9933fad303072a7 (patch) | |
| tree | 42b5b392bddc1c0add13fd61b3ab91e5c32b08ac /net/core | |
| parent | 78c8dbb6524c92f28ea56a09ce3960b435d8ed92 (diff) | |
| download | linux-0dcceabb0c1bf2d4c12a748df9933fad303072a7.tar.bz2 | |
net: filter: fix SKF_AD_PKTTYPE extension on big-endian
BPF classic->internal converter broke SKF_AD_PKTTYPE extension, since
pkt_type_offset() was failing to find skb->pkt_type field which is defined as:
__u8 pkt_type:3,
fclone:2,
ipvs_property:1,
peeked:1,
nf_trace:1;
Fix it by searching for 3 most significant bits and shift them by 5 at run-time
Fixes: bd4cf0ed331a ("net: filter: rework/optimize internal BPF interpreter's instruction set")
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Tested-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/filter.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 4aec7b93f1a9..ab3c74e49f07 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -578,7 +578,11 @@ EXPORT_SYMBOL_GPL(sk_run_filter_int_skb); * to make sure its still a 3bit field starting at a byte boundary; * taken from arch/x86/net/bpf_jit_comp.c. */ +#ifdef __BIG_ENDIAN_BITFIELD +#define PKT_TYPE_MAX (7 << 5) +#else #define PKT_TYPE_MAX 7 +#endif static unsigned int pkt_type_offset(void) { struct sk_buff skb_probe = { .pkt_type = ~0, }; @@ -685,6 +689,13 @@ static bool convert_bpf_extensions(struct sock_filter *fp, insn->code = BPF_ALU | BPF_AND | BPF_K; insn->a_reg = A_REG; insn->imm = PKT_TYPE_MAX; +#ifdef __BIG_ENDIAN_BITFIELD + insn++; + + insn->code = BPF_ALU | BPF_RSH | BPF_K; + insn->a_reg = A_REG; + insn->imm = 5; +#endif break; case SKF_AD_OFF + SKF_AD_IFINDEX: |