From ff6d090d0db41425aef0cfe5dc58bb3cc12514a2 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Mon, 10 Jun 2019 23:26:05 +0200 Subject: [PATCH] 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 Signed-off-by: Pablo Neira Ayuso --- include/net/netfilter/br_netfilter.h | 3 +- net/bridge/br_netfilter_hooks.c | 162 +++++++++++++++++---------- net/bridge/br_netfilter_ipv6.c | 2 +- 3 files changed, 107 insertions(+), 60 deletions(-) diff --git a/include/net/netfilter/br_netfilter.h b/include/net/netfilter/br_netfilter.h index 89808ce293c4..302fcd3aade2 100644 --- a/include/net/netfilter/br_netfilter.h +++ b/include/net/netfilter/br_netfilter.h @@ -42,7 +42,8 @@ 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); #if IS_ENABLED(CONFIG_IPV6) int br_validate_ipv6(struct net *net, struct sk_buff *skb); diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c index 22afa566cbce..3c67754d8075 100644 --- a/net/bridge/br_netfilter_hooks.c +++ b/net/bridge/br_netfilter_hooks.c @@ -49,27 +49,24 @@ static unsigned int brnf_net_id __read_mostly; -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 +struct brnf_net { + bool enabled; + + /* 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; +}; + #define IS_IP(skb) \ (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) @@ -89,17 +86,28 @@ static inline __be16 vlan_proto(const struct sk_buff *skb) return 0; } -#define IS_VLAN_IP(skb) \ - (vlan_proto(skb) == htons(ETH_P_IP) && \ - brnf_filter_vlan_tagged) +static inline bool is_vlan_ip(const struct sk_buff *skb, const struct net *net) +{ + struct brnf_net *brnet = net_generic(net, brnf_net_id); + + return vlan_proto(skb) == htons(ETH_P_IP) && brnet->filter_vlan_tagged; +} + +static inline bool is_vlan_ipv6(const struct sk_buff *skb, + const struct net *net) +{ + struct brnf_net *brnet = net_generic(net, brnf_net_id); -#define IS_VLAN_IPV6(skb) \ - (vlan_proto(skb) == htons(ETH_P_IPV6) && \ - brnf_filter_vlan_tagged) + return vlan_proto(skb) == htons(ETH_P_IPV6) && + brnet->filter_vlan_tagged; +} -#define IS_VLAN_ARP(skb) \ - (vlan_proto(skb) == htons(ETH_P_ARP) && \ - brnf_filter_vlan_tagged) +static inline bool is_vlan_arp(const struct sk_buff *skb, const struct net *net) +{ + struct brnf_net *brnet = net_generic(net, brnf_net_id); + + return vlan_proto(skb) == htons(ETH_P_ARP) && brnet->filter_vlan_tagged; +} static inline __be16 pppoe_proto(const struct sk_buff *skb) { @@ -107,15 +115,23 @@ static inline __be16 pppoe_proto(const struct sk_buff *skb) sizeof(struct pppoe_hdr))); } -#define IS_PPPOE_IP(skb) \ - (skb->protocol == htons(ETH_P_PPP_SES) && \ - pppoe_proto(skb) == htons(PPP_IP) && \ - brnf_filter_pppoe_tagged) +static inline bool is_pppoe_ip(const struct sk_buff *skb, const struct net *net) +{ + struct brnf_net *brnet = net_generic(net, brnf_net_id); + + return skb->protocol == htons(ETH_P_PPP_SES) && + pppoe_proto(skb) == htons(PPP_IP) && brnet->filter_pppoe_tagged; +} + +static inline bool is_pppoe_ipv6(const struct sk_buff *skb, + const struct net *net) +{ + struct brnf_net *brnet = net_generic(net, brnf_net_id); -#define IS_PPPOE_IPV6(skb) \ - (skb->protocol == htons(ETH_P_PPP_SES) && \ - pppoe_proto(skb) == htons(PPP_IPV6) && \ - brnf_filter_pppoe_tagged) + return skb->protocol == htons(ETH_P_PPP_SES) && + pppoe_proto(skb) == htons(PPP_IPV6) && + brnet->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) @@ -412,12 +428,16 @@ bridged_dnat: 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; + struct brnf_net *brnet = net_generic(net, brnf_net_id); br = bridge_parent(dev); - if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) + + if (brnet->pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) return br; vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, @@ -427,7 +447,7 @@ 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); @@ -438,7 +458,7 @@ 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; @@ -464,6 +484,7 @@ static unsigned int br_nf_pre_routing(void *priv, struct net_bridge_port *p; struct net_bridge *br; __u32 len = nf_bridge_encap_header_len(skb); + struct brnf_net *brnet; if (unlikely(!pskb_may_pull(skb, len))) return NF_DROP; @@ -473,8 +494,10 @@ 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 (!brnf_call_ip6tables && + brnet = net_generic(state->net, brnf_net_id); + if (IS_IPV6(skb) || is_vlan_ipv6(skb, state->net) || + is_pppoe_ipv6(skb, state->net)) { + if (!brnet->call_ip6tables && !br_opt_get(br, BROPT_NF_CALL_IP6TABLES)) return NF_ACCEPT; @@ -482,10 +505,11 @@ 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 (!brnet->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); @@ -495,7 +519,7 @@ static unsigned int br_nf_pre_routing(void *priv, 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); @@ -518,7 +542,7 @@ 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; @@ -573,9 +597,11 @@ 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; @@ -606,7 +632,7 @@ 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; @@ -619,23 +645,25 @@ static unsigned int br_nf_forward_arp(void *priv, struct net_bridge_port *p; struct net_bridge *br; struct net_device **d = (struct net_device **)(skb->cb); + struct brnf_net *brnet; p = br_port_get_rcu(state->out); if (p == NULL) return NF_ACCEPT; br = p->br; - if (!brnf_call_arptables && !br_opt_get(br, BROPT_NF_CALL_ARPTABLES)) + brnet = net_generic(state->net, brnf_net_id); + if (!brnet->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; } @@ -795,9 +823,11 @@ 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; @@ -1025,53 +1055,59 @@ 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, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { .procname = "bridge-nf-call-iptables", - .data = &brnf_call_iptables, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { .procname = "bridge-nf-call-ip6tables", - .data = &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, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { .procname = "bridge-nf-filter-pppoe-tagged", - .data = &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, .maxlen = sizeof(int), .mode = 0644, .proc_handler = brnf_sysctl_call_tables, }, { } }; + +static inline void br_netfilter_sysctl_default(struct brnf_net *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; +} + #endif static int __init br_netfilter_init(void) { int ret; + struct brnf_net *brnet; ret = register_pernet_subsys(&brnf_net_ops); if (ret < 0) @@ -1084,6 +1120,16 @@ static int __init br_netfilter_init(void) } #ifdef CONFIG_SYSCTL + brnet = net_generic(&init_net, brnf_net_id); + brnf_table[0].data = &brnet->call_arptables; + brnf_table[1].data = &brnet->call_iptables; + brnf_table[2].data = &brnet->call_ip6tables; + brnf_table[3].data = &brnet->filter_vlan_tagged; + brnf_table[4].data = &brnet->filter_pppoe_tagged; + brnf_table[5].data = &brnet->pass_vlan_indev; + + br_netfilter_sysctl_default(brnet); + brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); if (brnf_sysctl_header == NULL) { printk(KERN_WARNING diff --git a/net/bridge/br_netfilter_ipv6.c b/net/bridge/br_netfilter_ipv6.c index e88d6641647b..d77304e4e31a 100644 --- a/net/bridge/br_netfilter_ipv6.c +++ b/net/bridge/br_netfilter_ipv6.c @@ -228,7 +228,7 @@ unsigned int br_nf_pre_routing_ipv6(void *priv, nf_bridge = nf_bridge_alloc(skb); if (!nf_bridge) 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); -- 2.30.2