On Wed, Mar 25, 2015 at 05:39:04PM +0100, Daniel Borkmann wrote:
> On 03/25/2015 05:03 PM, Pablo Neira Ayuso wrote:
> >On Tue, Mar 24, 2015 at 04:30:29PM +0100, Daniel Borkmann wrote:
> >>diff --git a/net/netfilter/xt_cgroup.c b/net/netfilter/xt_cgroup.c
> >>index 7198d66..cd2468d 100644
> >>--- a/net/netfilter/xt_cgroup.c
> >>+++ b/net/netfilter/xt_cgroup.c
> >>@@ -16,8 +16,11 @@
> >> #include <linux/module.h>
> >> #include <linux/netfilter/x_tables.h>
> >> #include <linux/netfilter/xt_cgroup.h>
> >>+
> >> #include <net/sock.h>
> >>
> >>+#include "xt_sk_helper.h"
> >>+
> >> MODULE_LICENSE("GPL");
> >> MODULE_AUTHOR("Daniel Borkmann <dborkman@xxxxxxxxxx>");
> >> MODULE_DESCRIPTION("Xtables: process control group matching");
> >>@@ -34,38 +37,85 @@ static int cgroup_mt_check(const struct xt_mtchk_param *par)
> >> return 0;
> >> }
> >>
> >>-static bool
> >>-cgroup_mt(const struct sk_buff *skb, struct xt_action_param *par)
> >>+static bool cgroup_mt(const struct sk_buff *skb,
> >>+ const struct xt_action_param *par,
> >>+ struct sock *(*cgroup_mt_slow)(const struct sk_buff *skb,
> >>+ const struct net_device *indev))
> >> {
> >> const struct xt_cgroup_info *info = par->matchinfo;
> >>+ struct sock *sk = skb->sk;
> >>+ u32 sk_classid;
> >>+
> >>+ if (sk) {
> >>+ sk_classid = sk->sk_classid;
> >>+ } else {
> >>+ if (par->in != NULL)
> >>+ sk = cgroup_mt_slow(skb, par->in);
> >
> >Is this working with timewait sock?
>
> Yes, all socket objects that are allocated (sk_alloc()) get a
> sk_classid of the current task. Given that both share the same
> lookup handler, we don't ignore them here as some xt_socket
> flags could after the lookup optionally do.
I mean, we may get a packet from the input path while in TIME_WAIT, and
sk will be actually a inet_timewait_sock, which has a different
layout (no sk_classid).
> >>+ if (sk == NULL)
> >>+ return false;
> >>+
> >>+ sk_classid = sk->sk_classid;
> >>+ sock_gen_put(sk);
> >>+ }
> >>+
> >>+ return (info->id == sk_classid) ^ info->invert;
> >>+}
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