[PATCH 5/6 RFC] netfilter: add audit operation field

[Richard Guy Briggs <rgb@redhat.com>]

Add the operation performed (register or replace) to the NETFILTER_CFG and
NETFILTER_CFGSOLO records.

Here are sample records for accompanied:
  type=NETFILTER_CFG msg=audit(1494981627.248:9764): op=replace family=7 table=broute entries=0

and unaccompanied cases:
  type=UNKNOWN[1331] msg=audit(1494815998.178:167): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=system_u:system_r:iptables_t:s0 pid=598 comm="ip6tables-resto" exe="/usr/sbin/xtables-multi" op=replace family=10 table=filter entries=4

See: https://github.com/linux-audit/audit-kernel/issues/25

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
 net/bridge/netfilter/ebtables.c |    8 ++++----
 net/netfilter/x_tables.c        |    5 +++--
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 7499232..59b63a8 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1075,7 +1075,7 @@ static int do_replace_finish(struct net *net, struct ebt_replace *repl,
 			ab = audit_log_start(current->audit_context, GFP_KERNEL,
 					     AUDIT_NETFILTER_CFG);
 			if (ab) {
-				audit_log_format(ab, "family=%u table=%s entries=%u",
+				audit_log_format(ab, "op=replace family=%u table=%s entries=%u",
 						 AF_BRIDGE, repl->name,
 						 repl->nentries);
 				audit_log_end(ab);
@@ -1085,7 +1085,7 @@ static int do_replace_finish(struct net *net, struct ebt_replace *repl,
 					     AUDIT_NETFILTER_CFGSOLO);
 			if (ab) {
 				audit_log_task(ab);
-				audit_log_format(ab, " family=%u table=%s entries=%u",
+				audit_log_format(ab, " op=replace family=%u table=%s entries=%u",
 						 AF_BRIDGE, repl->name,
 						 repl->nentries);
 				audit_log_end(ab);
@@ -1259,7 +1259,7 @@ struct ebt_table * ebt_register_table(struct net *net,
 			ab = audit_log_start(current->audit_context, GFP_KERNEL,
 					     AUDIT_NETFILTER_CFG);
 			if (ab) {
-				audit_log_format(ab, "family=%u table=%s entries=%u",
+				audit_log_format(ab, "op=register family=%u table=%s entries=%u",
 						 AF_BRIDGE, repl->name,
 						 repl->nentries);
 				audit_log_end(ab);
@@ -1269,7 +1269,7 @@ struct ebt_table * ebt_register_table(struct net *net,
 					     AUDIT_NETFILTER_CFGSOLO);
 			if (ab) {
 				audit_log_task(ab);
-				audit_log_format(ab, " family=%u table=%s entries=%u",
+				audit_log_format(ab, " op=register family=%u table=%s entries=%u",
 						 AF_BRIDGE, repl->name,
 						 repl->nentries);
 				audit_log_end(ab);
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 8d28fff..395ebd3 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1199,7 +1199,8 @@ struct xt_table_info *xt_replace_table(struct xt_table *table,
 			ab = audit_log_start(current->audit_context, GFP_KERNEL,
 					     AUDIT_NETFILTER_CFG);
 			if (ab) {
-				audit_log_format(ab, "family=%u table=%s entries=%u",
+				audit_log_format(ab, "op=%s family=%u table=%s entries=%u",
+						 private->number ? "replace" : "register",
 						 table->af, table->name,
 						 private->number);
 				audit_log_end(ab);
@@ -1209,7 +1210,7 @@ struct xt_table_info *xt_replace_table(struct xt_table *table,
 					     AUDIT_NETFILTER_CFGSOLO);
 			if (ab) {
 				audit_log_task(ab);
-				audit_log_format(ab, " family=%u table=%s entries=%u",
+				audit_log_format(ab, " op=replace family=%u table=%s entries=%u",
 						 table->af, table->name,
 						 private->number);
 				audit_log_end(ab);
-- 
1.7.1