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author | 2018-03-27 11:53:07 +0200 | |
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committer | 2018-03-30 11:29:19 +0200 | |
commit | 02c7b25e5f54321b9063e18d4f52cce07f8e081d (patch) | |
tree | c497bb71b3f152f3f07ea93dfbd605632e61457a /net/netfilter/nft_chain_filter.c | |
parent | netfilter: nf_tables: nft_register_chain_type() returns void (diff) | |
download | linux-02c7b25e5f54321b9063e18d4f52cce07f8e081d.tar.gz linux-02c7b25e5f54321b9063e18d4f52cce07f8e081d.tar.bz2 linux-02c7b25e5f54321b9063e18d4f52cce07f8e081d.zip |
netfilter: nf_tables: build-in filter chain type
One module per supported filter chain family type takes too much memory
for very little code - too much modularization - place all chain filter
definitions in one single file.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_chain_filter.c')
-rw-r--r-- | net/netfilter/nft_chain_filter.c | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/net/netfilter/nft_chain_filter.c b/net/netfilter/nft_chain_filter.c new file mode 100644 index 000000000000..84c902477a91 --- /dev/null +++ b/net/netfilter/nft_chain_filter.c @@ -0,0 +1,398 @@ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/netdevice.h> +#include <net/net_namespace.h> +#include <net/netfilter/nf_tables.h> +#include <linux/netfilter_ipv4.h> +#include <linux/netfilter_ipv6.h> +#include <linux/netfilter_bridge.h> +#include <linux/netfilter_arp.h> +#include <net/netfilter/nf_tables_ipv4.h> +#include <net/netfilter/nf_tables_ipv6.h> + +#ifdef CONFIG_NF_TABLES_IPV4 +static unsigned int nft_do_chain_ipv4(void *priv, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nft_pktinfo pkt; + + nft_set_pktinfo(&pkt, skb, state); + nft_set_pktinfo_ipv4(&pkt, skb); + + return nft_do_chain(&pkt, priv); +} + +static const struct nft_chain_type nft_chain_filter_ipv4 = { + .name = "filter", + .type = NFT_CHAIN_T_DEFAULT, + .family = NFPROTO_IPV4, + .hook_mask = (1 << NF_INET_LOCAL_IN) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_FORWARD) | + (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_POST_ROUTING), + .hooks = { + [NF_INET_LOCAL_IN] = nft_do_chain_ipv4, + [NF_INET_LOCAL_OUT] = nft_do_chain_ipv4, + [NF_INET_FORWARD] = nft_do_chain_ipv4, + [NF_INET_PRE_ROUTING] = nft_do_chain_ipv4, + [NF_INET_POST_ROUTING] = nft_do_chain_ipv4, + }, +}; + +static void nft_chain_filter_ipv4_init(void) +{ + nft_register_chain_type(&nft_chain_filter_ipv4); +} +static void nft_chain_filter_ipv4_fini(void) +{ + nft_unregister_chain_type(&nft_chain_filter_ipv4); +} + +#else +static inline void nft_chain_filter_ipv4_init(void) {} +static inline void nft_chain_filter_ipv4_fini(void) {} +#endif /* CONFIG_NF_TABLES_IPV4 */ + +#ifdef CONFIG_NF_TABLES_ARP +static unsigned int nft_do_chain_arp(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nft_pktinfo pkt; + + nft_set_pktinfo(&pkt, skb, state); + nft_set_pktinfo_unspec(&pkt, skb); + + return nft_do_chain(&pkt, priv); +} + +static const struct nft_chain_type nft_chain_filter_arp = { + .name = "filter", + .type = NFT_CHAIN_T_DEFAULT, + .family = NFPROTO_ARP, + .owner = THIS_MODULE, + .hook_mask = (1 << NF_ARP_IN) | + (1 << NF_ARP_OUT), + .hooks = { + [NF_ARP_IN] = nft_do_chain_arp, + [NF_ARP_OUT] = nft_do_chain_arp, + }, +}; + +static void nft_chain_filter_arp_init(void) +{ + nft_register_chain_type(&nft_chain_filter_arp); +} + +static void nft_chain_filter_arp_fini(void) +{ + nft_unregister_chain_type(&nft_chain_filter_arp); +} +#else +static inline void nft_chain_filter_arp_init(void) {} +static inline void nft_chain_filter_arp_fini(void) {} +#endif /* CONFIG_NF_TABLES_ARP */ + +#ifdef CONFIG_NF_TABLES_IPV6 +static unsigned int nft_do_chain_ipv6(void *priv, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nft_pktinfo pkt; + + nft_set_pktinfo(&pkt, skb, state); + nft_set_pktinfo_ipv6(&pkt, skb); + + return nft_do_chain(&pkt, priv); +} + +static const struct nft_chain_type nft_chain_filter_ipv6 = { + .name = "filter", + .type = NFT_CHAIN_T_DEFAULT, + .family = NFPROTO_IPV6, + .hook_mask = (1 << NF_INET_LOCAL_IN) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_FORWARD) | + (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_POST_ROUTING), + .hooks = { + [NF_INET_LOCAL_IN] = nft_do_chain_ipv6, + [NF_INET_LOCAL_OUT] = nft_do_chain_ipv6, + [NF_INET_FORWARD] = nft_do_chain_ipv6, + [NF_INET_PRE_ROUTING] = nft_do_chain_ipv6, + [NF_INET_POST_ROUTING] = nft_do_chain_ipv6, + }, +}; + +static void nft_chain_filter_ipv6_init(void) +{ + nft_register_chain_type(&nft_chain_filter_ipv6); +} + +static void nft_chain_filter_ipv6_fini(void) +{ + nft_unregister_chain_type(&nft_chain_filter_ipv6); +} +#else +static inline void nft_chain_filter_ipv6_init(void) {} +static inline void nft_chain_filter_ipv6_fini(void) {} +#endif /* CONFIG_NF_TABLES_IPV6 */ + +#ifdef CONFIG_NF_TABLES_INET +static unsigned int nft_do_chain_inet(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nft_pktinfo pkt; + + nft_set_pktinfo(&pkt, skb, state); + + switch (state->pf) { + case NFPROTO_IPV4: + nft_set_pktinfo_ipv4(&pkt, skb); + break; + case NFPROTO_IPV6: + nft_set_pktinfo_ipv6(&pkt, skb); + break; + default: + break; + } + + return nft_do_chain(&pkt, priv); +} + +static const struct nft_chain_type nft_chain_filter_inet = { + .name = "filter", + .type = NFT_CHAIN_T_DEFAULT, + .family = NFPROTO_INET, + .hook_mask = (1 << NF_INET_LOCAL_IN) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_FORWARD) | + (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_POST_ROUTING), + .hooks = { + [NF_INET_LOCAL_IN] = nft_do_chain_inet, + [NF_INET_LOCAL_OUT] = nft_do_chain_inet, + [NF_INET_FORWARD] = nft_do_chain_inet, + [NF_INET_PRE_ROUTING] = nft_do_chain_inet, + [NF_INET_POST_ROUTING] = nft_do_chain_inet, + }, +}; + +static void nft_chain_filter_inet_init(void) +{ + nft_register_chain_type(&nft_chain_filter_inet); +} + +static void nft_chain_filter_inet_fini(void) +{ + nft_unregister_chain_type(&nft_chain_filter_inet); +} +#else +static inline void nft_chain_filter_inet_init(void) {} +static inline void nft_chain_filter_inet_fini(void) {} +#endif /* CONFIG_NF_TABLES_IPV6 */ + +#ifdef CONFIG_NF_TABLES_BRIDGE +static unsigned int +nft_do_chain_bridge(void *priv, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nft_pktinfo pkt; + + nft_set_pktinfo(&pkt, skb, state); + + switch (eth_hdr(skb)->h_proto) { + case htons(ETH_P_IP): + nft_set_pktinfo_ipv4_validate(&pkt, skb); + break; + case htons(ETH_P_IPV6): + nft_set_pktinfo_ipv6_validate(&pkt, skb); + break; + default: + nft_set_pktinfo_unspec(&pkt, skb); + break; + } + + return nft_do_chain(&pkt, priv); +} + +static const struct nft_chain_type nft_chain_filter_bridge = { + .name = "filter", + .type = NFT_CHAIN_T_DEFAULT, + .family = NFPROTO_BRIDGE, + .hook_mask = (1 << NF_BR_PRE_ROUTING) | + (1 << NF_BR_LOCAL_IN) | + (1 << NF_BR_FORWARD) | + (1 << NF_BR_LOCAL_OUT) | + (1 << NF_BR_POST_ROUTING), + .hooks = { + [NF_BR_PRE_ROUTING] = nft_do_chain_bridge, + [NF_BR_LOCAL_IN] = nft_do_chain_bridge, + [NF_BR_FORWARD] = nft_do_chain_bridge, + [NF_BR_LOCAL_OUT] = nft_do_chain_bridge, + [NF_BR_POST_ROUTING] = nft_do_chain_bridge, + }, +}; + +static void nft_chain_filter_bridge_init(void) +{ + nft_register_chain_type(&nft_chain_filter_bridge); +} + +static void nft_chain_filter_bridge_fini(void) +{ + nft_unregister_chain_type(&nft_chain_filter_bridge); +} +#else +static inline void nft_chain_filter_bridge_init(void) {} +static inline void nft_chain_filter_bridge_fini(void) {} +#endif /* CONFIG_NF_TABLES_BRIDGE */ + +#ifdef CONFIG_NF_TABLES_NETDEV +static unsigned int nft_do_chain_netdev(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nft_pktinfo pkt; + + nft_set_pktinfo(&pkt, skb, state); + + switch (skb->protocol) { + case htons(ETH_P_IP): + nft_set_pktinfo_ipv4_validate(&pkt, skb); + break; + case htons(ETH_P_IPV6): + nft_set_pktinfo_ipv6_validate(&pkt, skb); + break; + default: + nft_set_pktinfo_unspec(&pkt, skb); + break; + } + + return nft_do_chain(&pkt, priv); +} + +static const struct nft_chain_type nft_chain_filter_netdev = { + .name = "filter", + .type = NFT_CHAIN_T_DEFAULT, + .family = NFPROTO_NETDEV, + .hook_mask = (1 << NF_NETDEV_INGRESS), + .hooks = { + [NF_NETDEV_INGRESS] = nft_do_chain_netdev, + }, +}; + +static void nft_netdev_event(unsigned long event, struct net_device *dev, + struct nft_ctx *ctx) +{ + struct nft_base_chain *basechain = nft_base_chain(ctx->chain); + + switch (event) { + case NETDEV_UNREGISTER: + if (strcmp(basechain->dev_name, dev->name) != 0) + return; + + __nft_release_basechain(ctx); + break; + case NETDEV_CHANGENAME: + if (dev->ifindex != basechain->ops.dev->ifindex) + return; + + strncpy(basechain->dev_name, dev->name, IFNAMSIZ); + break; + } +} + +static int nf_tables_netdev_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct nft_table *table; + struct nft_chain *chain, *nr; + struct nft_ctx ctx = { + .net = dev_net(dev), + }; + + if (event != NETDEV_UNREGISTER && + event != NETDEV_CHANGENAME) + return NOTIFY_DONE; + + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_for_each_entry(table, &ctx.net->nft.tables, list) { + if (table->family != NFPROTO_NETDEV) + continue; + + ctx.family = table->family; + ctx.table = table; + list_for_each_entry_safe(chain, nr, &table->chains, list) { + if (!nft_is_base_chain(chain)) + continue; + + ctx.chain = chain; + nft_netdev_event(event, dev, &ctx); + } + } + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + + return NOTIFY_DONE; +} + +static struct notifier_block nf_tables_netdev_notifier = { + .notifier_call = nf_tables_netdev_event, +}; + +static int nft_chain_filter_netdev_init(void) +{ + int err; + + nft_register_chain_type(&nft_chain_filter_netdev); + + err = register_netdevice_notifier(&nf_tables_netdev_notifier); + if (err) + goto err_register_netdevice_notifier; + + return 0; + +err_register_netdevice_notifier: + nft_unregister_chain_type(&nft_chain_filter_netdev); + + return err; +} + +static void nft_chain_filter_netdev_fini(void) +{ + nft_unregister_chain_type(&nft_chain_filter_netdev); + unregister_netdevice_notifier(&nf_tables_netdev_notifier); +} +#else +static inline int nft_chain_filter_netdev_init(void) { return 0; } +static inline void nft_chain_filter_netdev_fini(void) {} +#endif /* CONFIG_NF_TABLES_NETDEV */ + +int __init nft_chain_filter_init(void) +{ + int err; + + err = nft_chain_filter_netdev_init(); + if (err < 0) + return err; + + nft_chain_filter_ipv4_init(); + nft_chain_filter_ipv6_init(); + nft_chain_filter_arp_init(); + nft_chain_filter_inet_init(); + nft_chain_filter_bridge_init(); + + return 0; +} + +void __exit nft_chain_filter_fini(void) +{ + nft_chain_filter_bridge_fini(); + nft_chain_filter_inet_fini(); + nft_chain_filter_arp_fini(); + nft_chain_filter_ipv6_fini(); + nft_chain_filter_ipv4_fini(); + nft_chain_filter_netdev_fini(); +} |