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netfilter: nf_log_syslog: Don't ignore unknown protocols 

With netdev and bridge nfprotos, loggers may see arbitrary ethernet
frames. Print at least basic info like interfaces and MAC header data.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter 2022-03-24 15:03:41 +01:00 committed by Pablo Neira Ayuso
parent 39ab798fc1
commit 0c8783806f
1 changed files with 31 additions and 0 deletions
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31
net/netfilter/nf_log_syslog.c
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@ -894,6 +894,33 @@ static struct nf_logger nf_ip6_logger __read_mostly = {
.me = THIS_MODULE,
};
static void nf_log_unknown_packet(struct net *net, u_int8_t pf,
unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct nf_loginfo *loginfo,
const char *prefix)
{
struct nf_log_buf *m;
/* FIXME: Disabled from containers until syslog ns is supported */
if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
return;
m = nf_log_buf_open();
if (!loginfo)
loginfo = &default_loginfo;
nf_log_dump_packet_common(m, pf, hooknum, skb, in, out, loginfo,
prefix);
dump_mac_header(m, loginfo, skb);
nf_log_buf_close(m);
}
static void nf_log_netdev_packet(struct net *net, u_int8_t pf,
unsigned int hooknum,
const struct sk_buff *skb,
@ -913,6 +940,10 @@ static void nf_log_netdev_packet(struct net *net, u_int8_t pf,
case htons(ETH_P_RARP):
nf_log_arp_packet(net, pf, hooknum, skb, in, out, loginfo, prefix);
break;
default:
nf_log_unknown_packet(net, pf, hooknum, skb,
in, out, loginfo, prefix);
break;
}
}