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Improve last commit: use bpf_mtap2() to avoiding stack usage.

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Prodded by:	julian
This commit is contained in:
Gleb Smirnoff 2010-07-09 11:27:33 +00:00
parent 831aa555de
commit 281b584e8e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=209845
1 changed files with 6 additions and 13 deletions
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19
sys/netinet/ipfw/ip_fw_log.c
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@ -152,24 +152,17 @@ ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args,
if (V_fw_verbose == 0) {
#ifndef WITHOUT_BPF
struct mbuf m0;
if (log_if == NULL || log_if->if_bpf == NULL)
return;
/* BPF treats the "mbuf" as read-only */
bzero(&m0, sizeof(struct mbuf));
m0.m_hdr.mh_next = m;
m0.m_hdr.mh_len = ETHER_HDR_LEN;
if (args->eh) { /* layer2, use orig hdr */
m0.m_hdr.mh_data = (char *)args->eh;
} else {
/* add fake header. Later we will store
* more info in the header
if (args->eh) /* layer2, use orig hdr */
BPF_MTAP2(log_if, args->eh, ETHER_HDR_LEN, m);
else
/* Add fake header. Later we will store
* more info in the header.
*/
m0.m_hdr.mh_data = "DDDDDDSSSSSS\x08\x00";
}
BPF_MTAP(log_if, &m0);
BPF_MTAP2(log_if, "DDDDDDSSSSSS\x08\x00", ETHER_HDR_LEN, m);
#endif /* !WITHOUT_BPF */
return;
}