Christian Brauner
2018-Nov-07 13:48 UTC
[Bridge] [PATCH net-next 0/2] br_netfilter: enable in non-initial netns
Hey everyone, Over time I have seen multiple reports by users who want to run applications (Kubernetes e.g. via [1]) that require the br_netfilter module in non-initial network namespaces [2], [3], [4], [5] (There are more issues where this requirement is reported.). Currently, the /proc/sys/net/bridge folder is only created in the initial network namespace. This patch series ensures that the /proc/sys/net/bridge folder is available in each network namespace if the module is loaded and disappears from all network namespaces when the module is unloaded. The patch series also makes the sysctls: bridge-nf-call-arptables bridge-nf-call-ip6tables bridge-nf-call-iptables bridge-nf-filter-pppoe-tagged bridge-nf-filter-vlan-tagged bridge-nf-pass-vlan-input-dev apply per network namespace. This unblocks some use-cases where users would like to e.g. not do bridge filtering for bridges in a specific network namespace while doing so for bridges located in another network namespace. The netfilter rules are afaict already per network namespace so it should be safe for users to specify whether a bridge device inside their network namespace is supposed to go through iptables et al. or not. Also, this can already be done by setting an option for each individual bridge via Netlink. It should also be possible to do this for all bridges in a network namespace via sysctls. Thanks! Christian [1]: https://github.com/zimmertr/Bootstrap-Kubernetes-with-Ansible [2]: https://github.com/lxc/lxd/issues/5193 [3]: https://discuss.linuxcontainers.org/t/bridge-nf-call-iptables-and-swap-error-on-lxd-with-kubeadm/2204 [4]: https://github.com/lxc/lxd/issues/3306 [5]: https://gitlab.com/gitlab-org/gitlab-runner/issues/3705 Christian Brauner (2): br_netfilter: add struct netns_brnf br_netfilter: namespace bridge netfilter sysctls include/net/net_namespace.h | 3 + include/net/netfilter/br_netfilter.h | 3 +- include/net/netns/netfilter.h | 16 +++ net/bridge/br_netfilter_hooks.c | 166 ++++++++++++++++++--------- net/bridge/br_netfilter_ipv6.c | 2 +- 5 files changed, 134 insertions(+), 56 deletions(-) -- 2.19.1
Christian Brauner
2018-Nov-07 13:48 UTC
[Bridge] [PATCH net-next 1/2] br_netfilter: add struct netns_brnf
This adds struct netns_brnf in preparation for per-network-namespace
br_netfilter settings. The individual br_netfilter sysctl options are moved
into a central place in struct net. The struct is only included when
the CONFIG_BRIDGE_NETFILTER kconfig option is enabled in the kernel.
Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>
Reviewed-by: Tyler Hicks <tyhicks at canonical.com>
---
include/net/net_namespace.h | 3 ++
include/net/netns/netfilter.h | 16 ++++++++
net/bridge/br_netfilter_hooks.c | 68 ++++++++++++++++-----------------
3 files changed, 52 insertions(+), 35 deletions(-)
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 99d4148e0f90..bea0474cd3ea 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -125,6 +125,9 @@ struct net {
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
struct netns_ct ct;
#endif
+#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
+ struct netns_brnf brnf;
+#endif
#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
struct netns_nftables nft;
#endif
diff --git a/include/net/netns/netfilter.h b/include/net/netns/netfilter.h
index ca043342c0eb..eedbd1ac940e 100644
--- a/include/net/netns/netfilter.h
+++ b/include/net/netns/netfilter.h
@@ -35,4 +35,20 @@ struct netns_nf {
bool defrag_ipv6;
#endif
};
+
+struct netns_brnf {
+#ifdef CONFIG_SYSCTL
+ struct ctl_table_header *ctl_hdr;
+#endif
+
+ /* default value is 1 */
+ int call_iptables;
+ int call_ip6tables;
+ int call_arptables;
+
+ /* default value is 0 */
+ int filter_vlan_tagged;
+ int filter_pppoe_tagged;
+ int pass_vlan_indev;
+};
#endif
diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
index b1b5e8516724..656a084f4825 100644
--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -53,23 +53,6 @@ struct brnf_net {
bool enabled;
};
-#ifdef CONFIG_SYSCTL
-static struct ctl_table_header *brnf_sysctl_header;
-static int brnf_call_iptables __read_mostly = 1;
-static int brnf_call_ip6tables __read_mostly = 1;
-static int brnf_call_arptables __read_mostly = 1;
-static int brnf_filter_vlan_tagged __read_mostly;
-static int brnf_filter_pppoe_tagged __read_mostly;
-static int brnf_pass_vlan_indev __read_mostly;
-#else
-#define brnf_call_iptables 1
-#define brnf_call_ip6tables 1
-#define brnf_call_arptables 1
-#define brnf_filter_vlan_tagged 0
-#define brnf_filter_pppoe_tagged 0
-#define brnf_pass_vlan_indev 0
-#endif
-
#define IS_IP(skb) \
(!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP))
@@ -91,15 +74,15 @@ static inline __be16 vlan_proto(const struct sk_buff *skb)
#define IS_VLAN_IP(skb) \
(vlan_proto(skb) == htons(ETH_P_IP) && \
- brnf_filter_vlan_tagged)
+ init_net.brnf.filter_vlan_tagged)
#define IS_VLAN_IPV6(skb) \
(vlan_proto(skb) == htons(ETH_P_IPV6) && \
- brnf_filter_vlan_tagged)
+ init_net.brnf.filter_vlan_tagged)
#define IS_VLAN_ARP(skb) \
(vlan_proto(skb) == htons(ETH_P_ARP) && \
- brnf_filter_vlan_tagged)
+ init_net.brnf.filter_vlan_tagged)
static inline __be16 pppoe_proto(const struct sk_buff *skb)
{
@@ -110,12 +93,12 @@ static inline __be16 pppoe_proto(const struct sk_buff *skb)
#define IS_PPPOE_IP(skb) \
(skb->protocol == htons(ETH_P_PPP_SES) && \
pppoe_proto(skb) == htons(PPP_IP) && \
- brnf_filter_pppoe_tagged)
+ init_net.brnf.filter_pppoe_tagged)
#define IS_PPPOE_IPV6(skb) \
(skb->protocol == htons(ETH_P_PPP_SES) && \
pppoe_proto(skb) == htons(PPP_IPV6) && \
- brnf_filter_pppoe_tagged)
+ init_net.brnf.filter_pppoe_tagged)
/* largest possible L2 header, see br_nf_dev_queue_xmit() */
#define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN)
@@ -430,7 +413,7 @@ static struct net_device *brnf_get_logical_dev(struct
sk_buff *skb, const struct
struct net_device *vlan, *br;
br = bridge_parent(dev);
- if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb))
+ if (init_net.brnf.pass_vlan_indev == 0 || !skb_vlan_tag_present(skb))
return br;
vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto,
@@ -487,7 +470,7 @@ static unsigned int br_nf_pre_routing(void *priv,
br = p->br;
if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) {
- if (!brnf_call_ip6tables &&
+ if (!init_net.brnf.call_ip6tables &&
!br_opt_get(br, BROPT_NF_CALL_IP6TABLES))
return NF_ACCEPT;
@@ -495,7 +478,8 @@ static unsigned int br_nf_pre_routing(void *priv,
return br_nf_pre_routing_ipv6(priv, skb, state);
}
- if (!brnf_call_iptables && !br_opt_get(br, BROPT_NF_CALL_IPTABLES))
+ if (!init_net.brnf.call_iptables &&
+ !br_opt_get(br, BROPT_NF_CALL_IPTABLES))
return NF_ACCEPT;
if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb))
@@ -637,7 +621,8 @@ static unsigned int br_nf_forward_arp(void *priv,
return NF_ACCEPT;
br = p->br;
- if (!brnf_call_arptables && !br_opt_get(br, BROPT_NF_CALL_ARPTABLES))
+ if (!init_net.brnf.call_arptables &&
+ !br_opt_get(br, BROPT_NF_CALL_ARPTABLES))
return NF_ACCEPT;
if (!IS_ARP(skb)) {
@@ -1032,42 +1017,42 @@ int brnf_sysctl_call_tables(struct ctl_table *ctl, int
write,
static struct ctl_table brnf_table[] = {
{
.procname = "bridge-nf-call-arptables",
- .data = &brnf_call_arptables,
+ .data = &init_net.brnf.call_arptables,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = brnf_sysctl_call_tables,
},
{
.procname = "bridge-nf-call-iptables",
- .data = &brnf_call_iptables,
+ .data = &init_net.brnf.call_iptables,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = brnf_sysctl_call_tables,
},
{
.procname = "bridge-nf-call-ip6tables",
- .data = &brnf_call_ip6tables,
+ .data = &init_net.brnf.call_ip6tables,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = brnf_sysctl_call_tables,
},
{
.procname = "bridge-nf-filter-vlan-tagged",
- .data = &brnf_filter_vlan_tagged,
+ .data = &init_net.brnf.filter_vlan_tagged,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = brnf_sysctl_call_tables,
},
{
.procname = "bridge-nf-filter-pppoe-tagged",
- .data = &brnf_filter_pppoe_tagged,
+ .data = &init_net.brnf.filter_pppoe_tagged,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = brnf_sysctl_call_tables,
},
{
.procname = "bridge-nf-pass-vlan-input-dev",
- .data = &brnf_pass_vlan_indev,
+ .data = &init_net.brnf.pass_vlan_indev,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = brnf_sysctl_call_tables,
@@ -1076,6 +1061,16 @@ static struct ctl_table brnf_table[] = {
};
#endif
+static inline void br_netfilter_sysctl_default(struct netns_brnf *brnf)
+{
+ brnf->call_iptables = 1;
+ brnf->call_ip6tables = 1;
+ brnf->call_arptables = 1;
+ brnf->filter_vlan_tagged = 0;
+ brnf->filter_pppoe_tagged = 0;
+ brnf->pass_vlan_indev = 0;
+}
+
static int __init br_netfilter_init(void)
{
int ret;
@@ -1090,9 +1085,12 @@ static int __init br_netfilter_init(void)
return ret;
}
+ /* Always set default values. Even if CONFIG_SYSCTL is not set. */
+ br_netfilter_sysctl_default(&init_net.brnf);
+
#ifdef CONFIG_SYSCTL
- brnf_sysctl_header = register_net_sysctl(&init_net,
"net/bridge", brnf_table);
- if (brnf_sysctl_header == NULL) {
+ init_net.brnf.ctl_hdr = register_net_sysctl(&init_net,
"net/bridge", brnf_table);
+ if (!init_net.brnf.ctl_hdr) {
printk(KERN_WARNING
"br_netfilter: can't register to sysctl.\n");
unregister_netdevice_notifier(&brnf_notifier);
@@ -1111,7 +1109,7 @@ static void __exit br_netfilter_fini(void)
unregister_netdevice_notifier(&brnf_notifier);
unregister_pernet_subsys(&brnf_net_ops);
#ifdef CONFIG_SYSCTL
- unregister_net_sysctl_table(brnf_sysctl_header);
+ unregister_net_sysctl_table(init_net.brnf.ctl_hdr);
#endif
}
--
2.19.1
Christian Brauner
2018-Nov-07 13:48 UTC
[Bridge] [PATCH net-next 2/2] br_netfilter: namespace bridge netfilter sysctls
Currently, the /proc/sys/net/bridge folder is only created in the initial
network namespace. This patch ensures that the /proc/sys/net/bridge folder
is available in each network namespace if the module is loaded and
disappears from all network namespaces when the module is unloaded.
In doing so the patch makes the sysctls:
bridge-nf-call-arptables
bridge-nf-call-ip6tables
bridge-nf-call-iptables
bridge-nf-filter-pppoe-tagged
bridge-nf-filter-vlan-tagged
bridge-nf-pass-vlan-input-dev
apply per network namespace. This unblocks some use-cases where users would
like to e.g. not do bridge filtering for bridges in a specific network
namespace while doing so for bridges located in another network namespace.
The netfilter rules are afaict already per network namespace so it should
be safe for users to specify whether bridge devices inside a network
namespace are supposed to go through iptables et al. or not. Also, this can
already be done per-bridge by setting an option for each individual bridge
via Netlink. It should also be possible to do this for all bridges in a
network namespace via sysctls.
Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>
Reviewed-by: Tyler Hicks <tyhicks at canonical.com>
---
include/net/netfilter/br_netfilter.h | 3 +-
net/bridge/br_netfilter_hooks.c | 116 ++++++++++++++++++++-------
net/bridge/br_netfilter_ipv6.c | 2 +-
3 files changed, 91 insertions(+), 30 deletions(-)
diff --git a/include/net/netfilter/br_netfilter.h
b/include/net/netfilter/br_netfilter.h
index 74af19c3a8f7..e51f5961272b 100644
--- a/include/net/netfilter/br_netfilter.h
+++ b/include/net/netfilter/br_netfilter.h
@@ -48,7 +48,8 @@ static inline struct rtable *bridge_parent_rtable(const struct
net_device *dev)
return port ? &port->br->fake_rtable : NULL;
}
-struct net_device *setup_pre_routing(struct sk_buff *skb);
+struct net_device *setup_pre_routing(struct sk_buff *skb,
+ const struct net *net);
void br_netfilter_enable(void);
#if IS_ENABLED(CONFIG_IPV6)
diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
index 656a084f4825..8a33268f2750 100644
--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -72,17 +72,17 @@ static inline __be16 vlan_proto(const struct sk_buff *skb)
return 0;
}
-#define IS_VLAN_IP(skb) \
+#define IS_VLAN_IP(skb, net) \
(vlan_proto(skb) == htons(ETH_P_IP) && \
- init_net.brnf.filter_vlan_tagged)
+ net->brnf.filter_vlan_tagged)
-#define IS_VLAN_IPV6(skb) \
+#define IS_VLAN_IPV6(skb, net) \
(vlan_proto(skb) == htons(ETH_P_IPV6) && \
- init_net.brnf.filter_vlan_tagged)
+ net->brnf.filter_vlan_tagged)
-#define IS_VLAN_ARP(skb) \
+#define IS_VLAN_ARP(skb, net) \
(vlan_proto(skb) == htons(ETH_P_ARP) && \
- init_net.brnf.filter_vlan_tagged)
+ net->brnf.filter_vlan_tagged)
static inline __be16 pppoe_proto(const struct sk_buff *skb)
{
@@ -90,15 +90,15 @@ static inline __be16 pppoe_proto(const struct sk_buff *skb)
sizeof(struct pppoe_hdr)));
}
-#define IS_PPPOE_IP(skb) \
+#define IS_PPPOE_IP(skb, net) \
(skb->protocol == htons(ETH_P_PPP_SES) && \
pppoe_proto(skb) == htons(PPP_IP) && \
- init_net.brnf.filter_pppoe_tagged)
+ net->brnf.filter_pppoe_tagged)
-#define IS_PPPOE_IPV6(skb) \
+#define IS_PPPOE_IPV6(skb, net) \
(skb->protocol == htons(ETH_P_PPP_SES) && \
pppoe_proto(skb) == htons(PPP_IPV6) && \
- init_net.brnf.filter_pppoe_tagged)
+ net->brnf.filter_pppoe_tagged)
/* largest possible L2 header, see br_nf_dev_queue_xmit() */
#define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN)
@@ -408,12 +408,14 @@ static int br_nf_pre_routing_finish(struct net *net,
struct sock *sk, struct sk_
return 0;
}
-static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const
struct net_device *dev)
+static struct net_device *brnf_get_logical_dev(struct sk_buff *skb,
+ const struct net_device *dev,
+ const struct net *net)
{
struct net_device *vlan, *br;
br = bridge_parent(dev);
- if (init_net.brnf.pass_vlan_indev == 0 || !skb_vlan_tag_present(skb))
+ if (net->brnf.pass_vlan_indev == 0 || !skb_vlan_tag_present(skb))
return br;
vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto,
@@ -423,7 +425,7 @@ static struct net_device *brnf_get_logical_dev(struct
sk_buff *skb, const struct
}
/* Some common code for IPv4/IPv6 */
-struct net_device *setup_pre_routing(struct sk_buff *skb)
+struct net_device *setup_pre_routing(struct sk_buff *skb, const struct net
*net)
{
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
@@ -434,7 +436,7 @@ struct net_device *setup_pre_routing(struct sk_buff *skb)
nf_bridge->in_prerouting = 1;
nf_bridge->physindev = skb->dev;
- skb->dev = brnf_get_logical_dev(skb, skb->dev);
+ skb->dev = brnf_get_logical_dev(skb, skb->dev, net);
if (skb->protocol == htons(ETH_P_8021Q))
nf_bridge->orig_proto = BRNF_PROTO_8021Q;
@@ -469,8 +471,9 @@ static unsigned int br_nf_pre_routing(void *priv,
return NF_DROP;
br = p->br;
- if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) {
- if (!init_net.brnf.call_ip6tables &&
+ if (IS_IPV6(skb) || IS_VLAN_IPV6(skb, state->net) ||
+ IS_PPPOE_IPV6(skb, state->net)) {
+ if (!state->net->brnf.call_ip6tables &&
!br_opt_get(br, BROPT_NF_CALL_IP6TABLES))
return NF_ACCEPT;
@@ -478,11 +481,12 @@ static unsigned int br_nf_pre_routing(void *priv,
return br_nf_pre_routing_ipv6(priv, skb, state);
}
- if (!init_net.brnf.call_iptables &&
+ if (!state->net->brnf.call_iptables &&
!br_opt_get(br, BROPT_NF_CALL_IPTABLES))
return NF_ACCEPT;
- if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb))
+ if (!IS_IP(skb) && !IS_VLAN_IP(skb, state->net) &&
+ !IS_PPPOE_IP(skb, state->net))
return NF_ACCEPT;
nf_bridge_pull_encap_header_rcsum(skb);
@@ -493,7 +497,7 @@ static unsigned int br_nf_pre_routing(void *priv,
nf_bridge_put(skb->nf_bridge);
if (!nf_bridge_alloc(skb))
return NF_DROP;
- if (!setup_pre_routing(skb))
+ if (!setup_pre_routing(skb, state->net))
return NF_DROP;
nf_bridge = nf_bridge_info_get(skb);
@@ -515,7 +519,7 @@ static int br_nf_forward_finish(struct net *net, struct sock
*sk, struct sk_buff
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
struct net_device *in;
- if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) {
+ if (!IS_ARP(skb) && !IS_VLAN_ARP(skb, net)) {
if (skb->protocol == htons(ETH_P_IP))
nf_bridge->frag_max_size = IPCB(skb)->frag_max_size;
@@ -569,9 +573,11 @@ static unsigned int br_nf_forward_ip(void *priv,
if (!parent)
return NF_DROP;
- if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb))
+ if (IS_IP(skb) || IS_VLAN_IP(skb, state->net) ||
+ IS_PPPOE_IP(skb, state->net))
pf = NFPROTO_IPV4;
- else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb))
+ else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb, state->net) ||
+ IS_PPPOE_IPV6(skb, state->net))
pf = NFPROTO_IPV6;
else
return NF_ACCEPT;
@@ -602,7 +608,7 @@ static unsigned int br_nf_forward_ip(void *priv,
skb->protocol = htons(ETH_P_IPV6);
NF_HOOK(pf, NF_INET_FORWARD, state->net, NULL, skb,
- brnf_get_logical_dev(skb, state->in),
+ brnf_get_logical_dev(skb, state->in, state->net),
parent, br_nf_forward_finish);
return NF_STOLEN;
@@ -621,18 +627,18 @@ static unsigned int br_nf_forward_arp(void *priv,
return NF_ACCEPT;
br = p->br;
- if (!init_net.brnf.call_arptables &&
+ if (!state->net->brnf.call_arptables &&
!br_opt_get(br, BROPT_NF_CALL_ARPTABLES))
return NF_ACCEPT;
if (!IS_ARP(skb)) {
- if (!IS_VLAN_ARP(skb))
+ if (!IS_VLAN_ARP(skb, state->net))
return NF_ACCEPT;
nf_bridge_pull_encap_header(skb);
}
if (arp_hdr(skb)->ar_pln != 4) {
- if (IS_VLAN_ARP(skb))
+ if (IS_VLAN_ARP(skb, state->net))
nf_bridge_push_encap_header(skb);
return NF_ACCEPT;
}
@@ -787,9 +793,11 @@ static unsigned int br_nf_post_routing(void *priv,
if (!realoutdev)
return NF_DROP;
- if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb))
+ if (IS_IP(skb) || IS_VLAN_IP(skb, state->net) ||
+ IS_PPPOE_IP(skb, state->net))
pf = NFPROTO_IPV4;
- else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb))
+ else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb, state->net) ||
+ IS_PPPOE_IPV6(skb, state->net))
pf = NFPROTO_IPV6;
else
return NF_ACCEPT;
@@ -1071,6 +1079,49 @@ static inline void br_netfilter_sysctl_default(struct
netns_brnf *brnf)
brnf->pass_vlan_indev = 0;
}
+static __net_init int br_netfilter_sysctl_init_net(struct net *net)
+{
+ struct ctl_table *table = brnf_table;
+
+ if (net_eq(net, &init_net))
+ return 0;
+
+ table = kmemdup(table, sizeof(brnf_table), GFP_KERNEL);
+ if (!table)
+ return -ENOMEM;
+
+ table[0].data = &net->brnf.call_arptables;
+ table[1].data = &net->brnf.call_iptables;
+ table[2].data = &net->brnf.call_ip6tables;
+ table[3].data = &net->brnf.filter_vlan_tagged;
+ table[4].data = &net->brnf.filter_pppoe_tagged;
+ table[5].data = &net->brnf.pass_vlan_indev;
+
+ net->brnf.ctl_hdr = register_net_sysctl(net, "net/bridge",
table);
+ if (!net->brnf.ctl_hdr) {
+ kfree(table);
+ return -ENOMEM;
+ }
+
+ br_netfilter_sysctl_default(&net->brnf);
+
+ return 0;
+}
+
+static __net_exit void br_netfilter_sysctl_exit_net(struct net *net)
+{
+ if (net_eq(net, &init_net))
+ return;
+
+ unregister_net_sysctl_table(net->brnf.ctl_hdr);
+ kfree(net->brnf.ctl_hdr->ctl_table_arg);
+}
+
+static struct pernet_operations br_netfilter_sysctl_ops = {
+ .init = br_netfilter_sysctl_init_net,
+ .exit = br_netfilter_sysctl_exit_net,
+};
+
static int __init br_netfilter_init(void)
{
int ret;
@@ -1097,6 +1148,14 @@ static int __init br_netfilter_init(void)
unregister_pernet_subsys(&brnf_net_ops);
return -ENOMEM;
}
+
+ ret = register_pernet_subsys(&br_netfilter_sysctl_ops);
+ if (ret < 0) {
+ unregister_netdevice_notifier(&brnf_notifier);
+ unregister_pernet_subsys(&brnf_net_ops);
+ unregister_net_sysctl_table(init_net.brnf.ctl_hdr);
+ return ret;
+ }
#endif
RCU_INIT_POINTER(nf_br_ops, &br_ops);
printk(KERN_NOTICE "Bridge firewalling registered\n");
@@ -1110,6 +1169,7 @@ static void __exit br_netfilter_fini(void)
unregister_pernet_subsys(&brnf_net_ops);
#ifdef CONFIG_SYSCTL
unregister_net_sysctl_table(init_net.brnf.ctl_hdr);
+ unregister_pernet_subsys(&br_netfilter_sysctl_ops);
#endif
}
diff --git a/net/bridge/br_netfilter_ipv6.c b/net/bridge/br_netfilter_ipv6.c
index 96c072e71ea2..d2220e502b6f 100644
--- a/net/bridge/br_netfilter_ipv6.c
+++ b/net/bridge/br_netfilter_ipv6.c
@@ -227,7 +227,7 @@ unsigned int br_nf_pre_routing_ipv6(void *priv,
nf_bridge_put(skb->nf_bridge);
if (!nf_bridge_alloc(skb))
return NF_DROP;
- if (!setup_pre_routing(skb))
+ if (!setup_pre_routing(skb, state->net))
return NF_DROP;
nf_bridge = nf_bridge_info_get(skb);
--
2.19.1
Florian LAUNAY
2019-Mar-07 14:58 UTC
[Bridge] [PATCH net-next 0/2] br_netfilter: enable in non-initial netns
Hi everyone, Can someone help move this topic forward ? This issue simply prevents any advanced use of docker in LXC. Thank you in advance! Florian LAUNAY On 07/11/2018 14:48, Christian Brauner wrote:> Hey everyone, > > Over time I have seen multiple reports by users who want to run applications > (Kubernetes e.g. via [1]) that require the br_netfilter module in > non-initial network namespaces [2], [3], [4], [5] (There are more issues > where this requirement is reported.). > Currently, the /proc/sys/net/bridge folder is only created in the > initial network namespace. This patch series ensures that the > /proc/sys/net/bridge folder is available in each network namespace if > the module is loaded and disappears from all network namespaces when the > module is unloaded. > The patch series also makes the sysctls: > > bridge-nf-call-arptables > bridge-nf-call-ip6tables > bridge-nf-call-iptables > bridge-nf-filter-pppoe-tagged > bridge-nf-filter-vlan-tagged > bridge-nf-pass-vlan-input-dev > > apply per network namespace. This unblocks some use-cases where users > would like to e.g. not do bridge filtering for bridges in a specific > network namespace while doing so for bridges located in another network > namespace. > The netfilter rules are afaict already per network namespace so it > should be safe for users to specify whether a bridge device inside their > network namespace is supposed to go through iptables et al. or not. > Also, this can already be done by setting an option for each individual > bridge via Netlink. It should also be possible to do this for all > bridges in a network namespace via sysctls. > > Thanks! > Christian > > [1]: https://github.com/zimmertr/Bootstrap-Kubernetes-with-Ansible > [2]: https://github.com/lxc/lxd/issues/5193 > [3]: https://discuss.linuxcontainers.org/t/bridge-nf-call-iptables-and-swap-error-on-lxd-with-kubeadm/2204 > [4]: https://github.com/lxc/lxd/issues/3306 > [5]: https://gitlab.com/gitlab-org/gitlab-runner/issues/3705 > > Christian Brauner (2): > br_netfilter: add struct netns_brnf > br_netfilter: namespace bridge netfilter sysctls > > include/net/net_namespace.h | 3 + > include/net/netfilter/br_netfilter.h | 3 +- > include/net/netns/netfilter.h | 16 +++ > net/bridge/br_netfilter_hooks.c | 166 ++++++++++++++++++--------- > net/bridge/br_netfilter_ipv6.c | 2 +- > 5 files changed, 134 insertions(+), 56 deletions(-) >