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authorPatrick McHardy <kaber@trash.net>2008-03-10 16:44:13 -0700
committerDavid S. Miller <davem@davemloft.net>2008-03-10 16:44:13 -0700
commitb7047a1c886386b10a103b4fea26678db8b57832 (patch)
tree7bc7d14b5a71470f774f190d7809cca45e8bef8f
parent019f692ea719a2da17606511d2648b8cc1762268 (diff)
downloadblackbird-op-linux-b7047a1c886386b10a103b4fea26678db8b57832.tar.gz
blackbird-op-linux-b7047a1c886386b10a103b4fea26678db8b57832.zip
[NETFILTER]: nfnetlink_log: fix EPERM when binding/unbinding and instance 0 exists
When binding or unbinding to an address family, the res_id is usually set to zero. When logging instance 0 already exists and is owned by a different process, this makes nfunl_recv_config return -EPERM without performing the bind operation. Since no operation on the foreign logging instance itself was requested, this is incorrect. Move bind/unbind commands before the queue instance permissions checks. Also remove an incorrect comment. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/netfilter/nfnetlink_log.c30
1 files changed, 16 insertions, 14 deletions
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index c6802c0d6ed8..bf3f19b21fe4 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -702,20 +702,30 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int16_t group_num = ntohs(nfmsg->res_id);
struct nfulnl_instance *inst;
+ struct nfulnl_msg_config_cmd *cmd = NULL;
int ret = 0;
+ if (nfula[NFULA_CFG_CMD]) {
+ u_int8_t pf = nfmsg->nfgen_family;
+ cmd = nla_data(nfula[NFULA_CFG_CMD]);
+
+ /* Commands without queue context */
+ switch (cmd->command) {
+ case NFULNL_CFG_CMD_PF_BIND:
+ return nf_log_register(pf, &nfulnl_logger);
+ case NFULNL_CFG_CMD_PF_UNBIND:
+ nf_log_unregister_pf(pf);
+ return 0;
+ }
+ }
+
inst = instance_lookup_get(group_num);
if (inst && inst->peer_pid != NETLINK_CB(skb).pid) {
ret = -EPERM;
goto out_put;
}
- if (nfula[NFULA_CFG_CMD]) {
- u_int8_t pf = nfmsg->nfgen_family;
- struct nfulnl_msg_config_cmd *cmd;
-
- cmd = nla_data(nfula[NFULA_CFG_CMD]);
-
+ if (cmd != NULL) {
switch (cmd->command) {
case NFULNL_CFG_CMD_BIND:
if (inst) {
@@ -738,14 +748,6 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
instance_destroy(inst);
goto out;
- case NFULNL_CFG_CMD_PF_BIND:
- ret = nf_log_register(pf, &nfulnl_logger);
- break;
- case NFULNL_CFG_CMD_PF_UNBIND:
- /* This is a bug and a feature. We cannot unregister
- * other handlers, like nfnetlink_inst can */
- nf_log_unregister_pf(pf);
- break;
default:
ret = -ENOTSUPP;
break;
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