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From 8ce2c17fd359a758b08bd15a33a0deae872c8231 Mon Sep 17 00:00:00 2001
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From: rpm-build <rpm-build>
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Date: Mon, 20 Apr 2015 13:47:28 +0200
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Subject: [PATCH] bpf: increase snaplen if doing cooked mode userspace
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filtering
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This commit should address the issue when bpf_filter_with_auxdata returned 0 for valid
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packets because offset in filter exceeded tp_snaplen as returned by kernel. If
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we filter in cooked mode filter offsets are adjusted because sll_header, we
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should do the same for snaplen.
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---
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pcap-linux.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/pcap-linux.c b/pcap-linux.c
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index 95c94df..034bcd3 100644
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--- a/pcap-linux.c
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+++ b/pcap-linux.c
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@@ -4186,6 +4186,7 @@ static int pcap_handle_packet_mmap(
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unsigned char *bp;
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struct sockaddr_ll *sll;
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struct pcap_pkthdr pcaphdr;
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+ unsigned int snaplen = tp_snaplen;
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/* perform sanity check on internal offset. */
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if (tp_mac + tp_snaplen > handle->bufsize) {
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@@ -4246,11 +4247,13 @@ static int pcap_handle_packet_mmap(
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hdrp->sll_halen = htons(sll->sll_halen);
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memcpy(hdrp->sll_addr, sll->sll_addr, SLL_ADDRLEN);
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hdrp->sll_protocol = sll->sll_protocol;
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+
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+ snaplen += sizeof(struct sll_header);
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}
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if (handlep->filter_in_userland && handle->fcode.bf_insns &&
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(bpf_filter(handle->fcode.bf_insns, bp,
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- tp_len, tp_snaplen) == 0))
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+ tp_len, snaplen) == 0))
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return 0;
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if (!linux_check_direction(handle, sll))
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--
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2.3.4
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