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Date: Tue, 22 Sep 2015 11:14:10 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 20/30] netfilter: x_tables: Pass struct net in xt_action_param
From: "Eric W. Biederman" <ebiederm@...ssion.com>
As xt_action_param lives on the stack this does not bloat any
persistent data structures.
This is a first step in making netfilter code that needs to know
which network namespace it is executing in simpler.
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/linux/netfilter/x_tables.h | 3 ++-
include/net/netfilter/nf_tables.h | 1 +
net/bridge/netfilter/ebtables.c | 1 +
net/ipv4/netfilter/arp_tables.c | 1 +
net/ipv4/netfilter/ip_tables.c | 1 +
net/ipv6/netfilter/ip6_tables.c | 1 +
net/sched/act_ipt.c | 1 +
net/sched/em_ipset.c | 1 +
8 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index b006b71..c557741 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -13,6 +13,7 @@
* @target: the target extension
* @matchinfo: per-match data
* @targetinfo: per-target data
+ * @net network namespace through which the action was invoked
* @in: input netdevice
* @out: output netdevice
* @fragoff: packet is a fragment, this is the data offset
@@ -24,7 +25,6 @@
* Fields written to by extensions:
*
* @hotdrop: drop packet if we had inspection problems
- * Network namespace obtainable using dev_net(in/out)
*/
struct xt_action_param {
union {
@@ -34,6 +34,7 @@ struct xt_action_param {
union {
const void *matchinfo, *targinfo;
};
+ struct net *net;
const struct net_device *in, *out;
int fragoff;
unsigned int thoff;
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index c0899f9..c051652 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -30,6 +30,7 @@ static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
const struct nf_hook_state *state)
{
pkt->skb = skb;
+ pkt->xt.net = state->net;
pkt->in = pkt->xt.in = state->in;
pkt->out = pkt->xt.out = state->out;
pkt->hook = pkt->xt.hooknum = state->hook;
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 8d5a3975..f46ca41 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -200,6 +200,7 @@ unsigned int ebt_do_table(struct sk_buff *skb,
struct xt_action_param acpar;
acpar.family = NFPROTO_BRIDGE;
+ acpar.net = state->net;
acpar.in = state->in;
acpar.out = state->out;
acpar.hotdrop = false;
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 10eb2b2..2dad3e1 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -285,6 +285,7 @@ unsigned int arpt_do_table(struct sk_buff *skb,
*/
e = get_entry(table_base, private->hook_entry[hook]);
+ acpar.net = state->net;
acpar.in = state->in;
acpar.out = state->out;
acpar.hooknum = hook;
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 2b049e1..42d0946 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -315,6 +315,7 @@ ipt_do_table(struct sk_buff *skb,
acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
acpar.thoff = ip_hdrlen(skb);
acpar.hotdrop = false;
+ acpar.net = state->net;
acpar.in = state->in;
acpar.out = state->out;
acpar.family = NFPROTO_IPV4;
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index da6446b..80e3bd7 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -340,6 +340,7 @@ ip6t_do_table(struct sk_buff *skb,
* rule is also a fragment-specific rule, non-fragments won't
* match it. */
acpar.hotdrop = false;
+ acpar.net = state->net;
acpar.in = state->in;
acpar.out = state->out;
acpar.family = NFPROTO_IPV6;
diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
index 99c9cc1..d058696 100644
--- a/net/sched/act_ipt.c
+++ b/net/sched/act_ipt.c
@@ -189,6 +189,7 @@ static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
* worry later - danger - this API seems to have changed
* from earlier kernels
*/
+ par.net = dev_net(skb->dev);
par.in = skb->dev;
par.out = NULL;
par.hooknum = ipt->tcfi_hook;
diff --git a/net/sched/em_ipset.c b/net/sched/em_ipset.c
index df0328b..c66ca94 100644
--- a/net/sched/em_ipset.c
+++ b/net/sched/em_ipset.c
@@ -95,6 +95,7 @@ static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em,
if (skb->skb_iif)
indev = dev_get_by_index_rcu(em->net, skb->skb_iif);
+ acpar.net = em->net;
acpar.in = indev ? indev : dev;
acpar.out = dev;
--
1.7.10.4
--
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