netfilter: bridge: port sysctls to use brnf_net
This ports the sysctls to use struct brnf_net. With this patch we make it possible to namespace the br_netfilter module in the following patch. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Christian Brauner
Pablo Neira Ayuso
Родитель
9911c1139f
Коммит
ff6d090d0d
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@ -42,7 +42,8 @@ static inline struct rtable *bridge_parent_rtable(const struct net_device *dev)
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return port ? &port->br->fake_rtable : NULL;
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}
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struct net_device *setup_pre_routing(struct sk_buff *skb);
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struct net_device *setup_pre_routing(struct sk_buff *skb,
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const struct net *net);
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#if IS_ENABLED(CONFIG_IPV6)
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int br_validate_ipv6(struct net *net, struct sk_buff *skb);
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@ -49,27 +49,24 @@
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static unsigned int brnf_net_id __read_mostly;
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struct brnf_net {
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bool enabled;
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};
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#ifdef CONFIG_SYSCTL
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static struct ctl_table_header *brnf_sysctl_header;
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static int brnf_call_iptables __read_mostly = 1;
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static int brnf_call_ip6tables __read_mostly = 1;
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static int brnf_call_arptables __read_mostly = 1;
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static int brnf_filter_vlan_tagged __read_mostly;
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static int brnf_filter_pppoe_tagged __read_mostly;
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static int brnf_pass_vlan_indev __read_mostly;
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#else
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#define brnf_call_iptables 1
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#define brnf_call_ip6tables 1
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#define brnf_call_arptables 1
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#define brnf_filter_vlan_tagged 0
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#define brnf_filter_pppoe_tagged 0
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#define brnf_pass_vlan_indev 0
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#endif
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struct brnf_net {
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bool enabled;
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/* default value is 1 */
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int call_iptables;
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int call_ip6tables;
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int call_arptables;
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/* default value is 0 */
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int filter_vlan_tagged;
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int filter_pppoe_tagged;
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int pass_vlan_indev;
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};
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#define IS_IP(skb) \
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(!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP))
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@ -89,17 +86,28 @@ static inline __be16 vlan_proto(const struct sk_buff *skb)
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return 0;
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}
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#define IS_VLAN_IP(skb) \
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(vlan_proto(skb) == htons(ETH_P_IP) && \
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brnf_filter_vlan_tagged)
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static inline bool is_vlan_ip(const struct sk_buff *skb, const struct net *net)
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{
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struct brnf_net *brnet = net_generic(net, brnf_net_id);
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#define IS_VLAN_IPV6(skb) \
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(vlan_proto(skb) == htons(ETH_P_IPV6) && \
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brnf_filter_vlan_tagged)
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return vlan_proto(skb) == htons(ETH_P_IP) && brnet->filter_vlan_tagged;
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}
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#define IS_VLAN_ARP(skb) \
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(vlan_proto(skb) == htons(ETH_P_ARP) && \
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brnf_filter_vlan_tagged)
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static inline bool is_vlan_ipv6(const struct sk_buff *skb,
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const struct net *net)
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{
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struct brnf_net *brnet = net_generic(net, brnf_net_id);
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return vlan_proto(skb) == htons(ETH_P_IPV6) &&
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brnet->filter_vlan_tagged;
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}
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static inline bool is_vlan_arp(const struct sk_buff *skb, const struct net *net)
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{
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struct brnf_net *brnet = net_generic(net, brnf_net_id);
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return vlan_proto(skb) == htons(ETH_P_ARP) && brnet->filter_vlan_tagged;
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}
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static inline __be16 pppoe_proto(const struct sk_buff *skb)
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{
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@ -107,15 +115,23 @@ static inline __be16 pppoe_proto(const struct sk_buff *skb)
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sizeof(struct pppoe_hdr)));
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}
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#define IS_PPPOE_IP(skb) \
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(skb->protocol == htons(ETH_P_PPP_SES) && \
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pppoe_proto(skb) == htons(PPP_IP) && \
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brnf_filter_pppoe_tagged)
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static inline bool is_pppoe_ip(const struct sk_buff *skb, const struct net *net)
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{
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struct brnf_net *brnet = net_generic(net, brnf_net_id);
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#define IS_PPPOE_IPV6(skb) \
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(skb->protocol == htons(ETH_P_PPP_SES) && \
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pppoe_proto(skb) == htons(PPP_IPV6) && \
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brnf_filter_pppoe_tagged)
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return skb->protocol == htons(ETH_P_PPP_SES) &&
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pppoe_proto(skb) == htons(PPP_IP) && brnet->filter_pppoe_tagged;
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}
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static inline bool is_pppoe_ipv6(const struct sk_buff *skb,
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const struct net *net)
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{
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struct brnf_net *brnet = net_generic(net, brnf_net_id);
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return skb->protocol == htons(ETH_P_PPP_SES) &&
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pppoe_proto(skb) == htons(PPP_IPV6) &&
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brnet->filter_pppoe_tagged;
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}
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/* largest possible L2 header, see br_nf_dev_queue_xmit() */
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#define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN)
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@ -412,12 +428,16 @@ bridged_dnat:
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return 0;
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}
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static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev)
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static struct net_device *brnf_get_logical_dev(struct sk_buff *skb,
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const struct net_device *dev,
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const struct net *net)
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{
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struct net_device *vlan, *br;
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struct brnf_net *brnet = net_generic(net, brnf_net_id);
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br = bridge_parent(dev);
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if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb))
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if (brnet->pass_vlan_indev == 0 || !skb_vlan_tag_present(skb))
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return br;
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vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto,
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@ -427,7 +447,7 @@ static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct
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}
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/* Some common code for IPv4/IPv6 */
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struct net_device *setup_pre_routing(struct sk_buff *skb)
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struct net_device *setup_pre_routing(struct sk_buff *skb, const struct net *net)
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{
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struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
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@ -438,7 +458,7 @@ struct net_device *setup_pre_routing(struct sk_buff *skb)
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nf_bridge->in_prerouting = 1;
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nf_bridge->physindev = skb->dev;
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skb->dev = brnf_get_logical_dev(skb, skb->dev);
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skb->dev = brnf_get_logical_dev(skb, skb->dev, net);
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if (skb->protocol == htons(ETH_P_8021Q))
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nf_bridge->orig_proto = BRNF_PROTO_8021Q;
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@ -464,6 +484,7 @@ static unsigned int br_nf_pre_routing(void *priv,
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struct net_bridge_port *p;
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struct net_bridge *br;
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__u32 len = nf_bridge_encap_header_len(skb);
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struct brnf_net *brnet;
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if (unlikely(!pskb_may_pull(skb, len)))
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return NF_DROP;
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@ -473,8 +494,10 @@ static unsigned int br_nf_pre_routing(void *priv,
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return NF_DROP;
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br = p->br;
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if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) {
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if (!brnf_call_ip6tables &&
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brnet = net_generic(state->net, brnf_net_id);
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if (IS_IPV6(skb) || is_vlan_ipv6(skb, state->net) ||
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is_pppoe_ipv6(skb, state->net)) {
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if (!brnet->call_ip6tables &&
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!br_opt_get(br, BROPT_NF_CALL_IP6TABLES))
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return NF_ACCEPT;
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@ -482,10 +505,11 @@ static unsigned int br_nf_pre_routing(void *priv,
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return br_nf_pre_routing_ipv6(priv, skb, state);
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}
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if (!brnf_call_iptables && !br_opt_get(br, BROPT_NF_CALL_IPTABLES))
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if (!brnet->call_iptables && !br_opt_get(br, BROPT_NF_CALL_IPTABLES))
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return NF_ACCEPT;
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if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb))
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if (!IS_IP(skb) && !is_vlan_ip(skb, state->net) &&
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!is_pppoe_ip(skb, state->net))
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return NF_ACCEPT;
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nf_bridge_pull_encap_header_rcsum(skb);
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@ -495,7 +519,7 @@ static unsigned int br_nf_pre_routing(void *priv,
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if (!nf_bridge_alloc(skb))
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return NF_DROP;
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if (!setup_pre_routing(skb))
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if (!setup_pre_routing(skb, state->net))
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return NF_DROP;
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nf_bridge = nf_bridge_info_get(skb);
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@ -518,7 +542,7 @@ static int br_nf_forward_finish(struct net *net, struct sock *sk, struct sk_buff
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struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
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struct net_device *in;
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if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) {
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if (!IS_ARP(skb) && !is_vlan_arp(skb, net)) {
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if (skb->protocol == htons(ETH_P_IP))
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nf_bridge->frag_max_size = IPCB(skb)->frag_max_size;
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@ -573,9 +597,11 @@ static unsigned int br_nf_forward_ip(void *priv,
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if (!parent)
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return NF_DROP;
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if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb))
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if (IS_IP(skb) || is_vlan_ip(skb, state->net) ||
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is_pppoe_ip(skb, state->net))
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pf = NFPROTO_IPV4;
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else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb))
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else if (IS_IPV6(skb) || is_vlan_ipv6(skb, state->net) ||
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is_pppoe_ipv6(skb, state->net))
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pf = NFPROTO_IPV6;
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else
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return NF_ACCEPT;
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@ -606,7 +632,7 @@ static unsigned int br_nf_forward_ip(void *priv,
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skb->protocol = htons(ETH_P_IPV6);
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NF_HOOK(pf, NF_INET_FORWARD, state->net, NULL, skb,
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brnf_get_logical_dev(skb, state->in),
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brnf_get_logical_dev(skb, state->in, state->net),
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parent, br_nf_forward_finish);
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return NF_STOLEN;
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@ -619,23 +645,25 @@ static unsigned int br_nf_forward_arp(void *priv,
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struct net_bridge_port *p;
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struct net_bridge *br;
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struct net_device **d = (struct net_device **)(skb->cb);
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struct brnf_net *brnet;
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p = br_port_get_rcu(state->out);
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if (p == NULL)
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return NF_ACCEPT;
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br = p->br;
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if (!brnf_call_arptables && !br_opt_get(br, BROPT_NF_CALL_ARPTABLES))
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brnet = net_generic(state->net, brnf_net_id);
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if (!brnet->call_arptables && !br_opt_get(br, BROPT_NF_CALL_ARPTABLES))
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return NF_ACCEPT;
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if (!IS_ARP(skb)) {
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if (!IS_VLAN_ARP(skb))
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if (!is_vlan_arp(skb, state->net))
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return NF_ACCEPT;
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nf_bridge_pull_encap_header(skb);
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}
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if (arp_hdr(skb)->ar_pln != 4) {
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if (IS_VLAN_ARP(skb))
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if (is_vlan_arp(skb, state->net))
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nf_bridge_push_encap_header(skb);
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return NF_ACCEPT;
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}
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@ -795,9 +823,11 @@ static unsigned int br_nf_post_routing(void *priv,
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if (!realoutdev)
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return NF_DROP;
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if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb))
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if (IS_IP(skb) || is_vlan_ip(skb, state->net) ||
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is_pppoe_ip(skb, state->net))
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pf = NFPROTO_IPV4;
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else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb))
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else if (IS_IPV6(skb) || is_vlan_ipv6(skb, state->net) ||
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is_pppoe_ipv6(skb, state->net))
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pf = NFPROTO_IPV6;
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else
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return NF_ACCEPT;
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@ -1025,53 +1055,59 @@ int brnf_sysctl_call_tables(struct ctl_table *ctl, int write,
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static struct ctl_table brnf_table[] = {
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{
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.procname = "bridge-nf-call-arptables",
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.data = &brnf_call_arptables,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = brnf_sysctl_call_tables,
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},
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{
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.procname = "bridge-nf-call-iptables",
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.data = &brnf_call_iptables,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = brnf_sysctl_call_tables,
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},
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{
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.procname = "bridge-nf-call-ip6tables",
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.data = &brnf_call_ip6tables,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = brnf_sysctl_call_tables,
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},
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{
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.procname = "bridge-nf-filter-vlan-tagged",
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.data = &brnf_filter_vlan_tagged,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = brnf_sysctl_call_tables,
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},
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{
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.procname = "bridge-nf-filter-pppoe-tagged",
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.data = &brnf_filter_pppoe_tagged,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = brnf_sysctl_call_tables,
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},
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{
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.procname = "bridge-nf-pass-vlan-input-dev",
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.data = &brnf_pass_vlan_indev,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = brnf_sysctl_call_tables,
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},
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{ }
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};
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static inline void br_netfilter_sysctl_default(struct brnf_net *brnf)
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{
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brnf->call_iptables = 1;
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brnf->call_ip6tables = 1;
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brnf->call_arptables = 1;
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brnf->filter_vlan_tagged = 0;
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brnf->filter_pppoe_tagged = 0;
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brnf->pass_vlan_indev = 0;
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}
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#endif
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static int __init br_netfilter_init(void)
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{
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int ret;
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struct brnf_net *brnet;
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ret = register_pernet_subsys(&brnf_net_ops);
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if (ret < 0)
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@ -1084,6 +1120,16 @@ static int __init br_netfilter_init(void)
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}
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#ifdef CONFIG_SYSCTL
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brnet = net_generic(&init_net, brnf_net_id);
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brnf_table[0].data = &brnet->call_arptables;
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brnf_table[1].data = &brnet->call_iptables;
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brnf_table[2].data = &brnet->call_ip6tables;
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brnf_table[3].data = &brnet->filter_vlan_tagged;
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brnf_table[4].data = &brnet->filter_pppoe_tagged;
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brnf_table[5].data = &brnet->pass_vlan_indev;
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br_netfilter_sysctl_default(brnet);
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brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table);
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if (brnf_sysctl_header == NULL) {
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printk(KERN_WARNING
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@ -228,7 +228,7 @@ unsigned int br_nf_pre_routing_ipv6(void *priv,
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nf_bridge = nf_bridge_alloc(skb);
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if (!nf_bridge)
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return NF_DROP;
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if (!setup_pre_routing(skb))
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if (!setup_pre_routing(skb, state->net))
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return NF_DROP;
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nf_bridge = nf_bridge_info_get(skb);
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