8:50 p.m.
Simplify and eliminate flipping in and out of message fields, relying on nfmark
the way we do for audit_key.
https://github.com/linux-audit/audit-kernel/issues/11
Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com>
---
net/netfilter/xt_AUDIT.c | 128 +++++++++++++++-------------------------------
1 files changed, 41 insertions(+), 87 deletions(-)
diff --git a/net/netfilter/xt_AUDIT.c b/net/netfilter/xt_AUDIT.c
index 4973cbd..05f7f25 100644
--- a/net/netfilter/xt_AUDIT.c
+++ b/net/netfilter/xt_AUDIT.c
@@ -31,146 +31,100 @@ MODULE_ALIAS("ip6t_AUDIT");
MODULE_ALIAS("ebt_AUDIT");
MODULE_ALIAS("arpt_AUDIT");
-static void audit_proto(struct audit_buffer *ab, struct sk_buff *skb,
- unsigned int proto, unsigned int offset)
-{
- switch (proto) {
- case IPPROTO_TCP:
- case IPPROTO_UDP:
- case IPPROTO_UDPLITE: {
- const __be16 *pptr;
- __be16 _ports[2];
-
- pptr = skb_header_pointer(skb, offset, sizeof(_ports), _ports);
- if (pptr == NULL) {
- audit_log_format(ab, " truncated=1");
- return;
- }
-
- audit_log_format(ab, " sport=%hu dport=%hu",
- ntohs(pptr[0]), ntohs(pptr[1]));
- }
- break;
-
- case IPPROTO_ICMP:
- case IPPROTO_ICMPV6: {
- const u8 *iptr;
- u8 _ih[2];
-
- iptr = skb_header_pointer(skb, offset, sizeof(_ih), &_ih);
- if (iptr == NULL) {
- audit_log_format(ab, " truncated=1");
- return;
- }
-
- audit_log_format(ab, " icmptype=%hhu icmpcode=%hhu",
- iptr[0], iptr[1]);
-
- }
- break;
- }
-}
+struct nfpkt_par {
+ int ipv;
+ const void *saddr;
+ const void *daddr;
+ u8 proto;
+};
-static void audit_ip4(struct audit_buffer *ab, struct sk_buff *skb)
+static void audit_ip4(struct audit_buffer *ab, struct sk_buff *skb, struct nfpkt_par
*apar)
{
struct iphdr _iph;
const struct iphdr *ih;
+ apar->ipv = 4;
ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
- if (!ih) {
- audit_log_format(ab, " truncated=1");
+ if (!ih)
return;
- }
-
- audit_log_format(ab, " saddr=%pI4 daddr=%pI4 ipid=%hu proto=%hhu",
- &ih->saddr, &ih->daddr, ntohs(ih->id), ih->protocol);
-
- if (ntohs(ih->frag_off) & IP_OFFSET) {
- audit_log_format(ab, " frag=1");
- return;
- }
- audit_proto(ab, skb, ih->protocol, ih->ihl * 4);
+ apar->saddr = &ih->saddr;
+ apar->daddr = &ih->daddr;
+ apar->proto = ih->protocol;
}
-static void audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
+static void audit_ip6(struct audit_buffer *ab, struct sk_buff *skb, struct nfpkt_par
*apar)
{
struct ipv6hdr _ip6h;
const struct ipv6hdr *ih;
u8 nexthdr;
__be16 frag_off;
- int offset;
+ apar->ipv = 6;
ih = skb_header_pointer(skb, skb_network_offset(skb), sizeof(_ip6h), &_ip6h);
- if (!ih) {
- audit_log_format(ab, " truncated=1");
+ if (!ih)
return;
- }
nexthdr = ih->nexthdr;
- offset = ipv6_skip_exthdr(skb, skb_network_offset(skb) + sizeof(_ip6h),
- &nexthdr, &frag_off);
+ ipv6_skip_exthdr(skb, skb_network_offset(skb) + sizeof(_ip6h), &nexthdr,
&frag_off);
- audit_log_format(ab, " saddr=%pI6c daddr=%pI6c proto=%hhu",
- &ih->saddr, &ih->daddr, nexthdr);
-
- if (offset)
- audit_proto(ab, skb, nexthdr, offset);
+ apar->saddr = &ih->saddr;
+ apar->daddr = &ih->daddr;
+ apar->proto = nexthdr;
}
static unsigned int
audit_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
- const struct xt_audit_info *info = par->targinfo;
struct audit_buffer *ab;
+ struct nfpkt_par apar = {
+ -1, NULL, NULL, -1,
+ };
if (audit_enabled == 0)
goto errout;
-
ab = audit_log_start(NULL, GFP_ATOMIC, AUDIT_NETFILTER_PKT);
if (ab == NULL)
goto errout;
- audit_log_format(ab, "action=%hhu hook=%u len=%u inif=%s outif=%s",
- info->type, par->hooknum, skb->len,
- par->in ? par->in->name : "?",
- par->out ? par->out->name : "?");
-
- if (skb->mark)
- audit_log_format(ab, " mark=%#x", skb->mark);
+ audit_log_format(ab, " mark=%#x", skb->mark ?: -1);
if (skb->dev && skb->dev->type == ARPHRD_ETHER) {
- audit_log_format(ab, " smac=%pM dmac=%pM macproto=0x%04x",
- eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
- ntohs(eth_hdr(skb)->h_proto));
-
if (par->family == NFPROTO_BRIDGE) {
switch (eth_hdr(skb)->h_proto) {
case htons(ETH_P_IP):
- audit_ip4(ab, skb);
+ audit_ip4(ab, skb, &apar);
break;
case htons(ETH_P_IPV6):
- audit_ip6(ab, skb);
+ audit_ip6(ab, skb, &apar);
break;
}
}
}
-
+ if (apar.ipv == -1)
switch (par->family) {
case NFPROTO_IPV4:
- audit_ip4(ab, skb);
+ audit_ip4(ab, skb, &apar);
break;
case NFPROTO_IPV6:
- audit_ip6(ab, skb);
+ audit_ip6(ab, skb, &apar);
break;
}
-#ifdef CONFIG_NETWORK_SECMARK
- if (skb->secmark)
- audit_log_secctx(ab, skb->secmark);
-#endif
+ switch (apar.ipv) {
+ case 4:
+ audit_log_format(ab, " saddr=%pI4 daddr=%pI4 proto=%hhu",
+ apar.saddr, apar.daddr, apar.proto);
+ break;
+ case 6:
+ audit_log_format(ab, " saddr=%pI6c daddr=%pI6c proto=%hhu",
+ apar.saddr, apar.daddr, apar.proto);
+ break;
+ default:
+ audit_log_format(ab, " saddr=? daddr=? proto=-1");
+ }
audit_log_end(ab);
--
1.7.1