diff options
Diffstat (limited to 'net/netfilter')
-rw-r--r-- | net/netfilter/Kconfig | 37 | ||||
-rw-r--r-- | net/netfilter/Makefile | 16 | ||||
-rw-r--r-- | net/netfilter/nf_tables_api.c | 1760 | ||||
-rw-r--r-- | net/netfilter/nf_tables_core.c | 152 | ||||
-rw-r--r-- | net/netfilter/nft_bitwise.c | 140 | ||||
-rw-r--r-- | net/netfilter/nft_byteorder.c | 167 | ||||
-rw-r--r-- | net/netfilter/nft_cmp.c | 146 | ||||
-rw-r--r-- | net/netfilter/nft_counter.c | 107 | ||||
-rw-r--r-- | net/netfilter/nft_ct.c | 252 | ||||
-rw-r--r-- | net/netfilter/nft_expr_template.c | 88 | ||||
-rw-r--r-- | net/netfilter/nft_exthdr.c | 127 | ||||
-rw-r--r-- | net/netfilter/nft_hash.c | 348 | ||||
-rw-r--r-- | net/netfilter/nft_immediate.c | 113 | ||||
-rw-r--r-- | net/netfilter/nft_limit.c | 113 | ||||
-rw-r--r-- | net/netfilter/nft_log.c | 140 | ||||
-rw-r--r-- | net/netfilter/nft_meta.c | 222 | ||||
-rw-r--r-- | net/netfilter/nft_meta_target.c | 117 | ||||
-rw-r--r-- | net/netfilter/nft_payload.c | 137 | ||||
-rw-r--r-- | net/netfilter/nft_set.c | 381 |
19 files changed, 4563 insertions, 0 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 6e839b6dff2b..c271e1af93b5 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -413,6 +413,43 @@ config NETFILTER_SYNPROXY endif # NF_CONNTRACK +config NF_TABLES + depends on NETFILTER_NETLINK + tristate "Netfilter nf_tables support" + +config NFT_EXTHDR + depends on NF_TABLES + tristate "Netfilter nf_tables IPv6 exthdr module" + +config NFT_META + depends on NF_TABLES + tristate "Netfilter nf_tables meta module" + +config NFT_CT + depends on NF_TABLES + depends on NF_CONNTRACK + tristate "Netfilter nf_tables conntrack module" + +config NFT_SET + depends on NF_TABLES + tristate "Netfilter nf_tables set module" + +config NFT_HASH + depends on NF_TABLES + tristate "Netfilter nf_tables hash module" + +config NFT_COUNTER + depends on NF_TABLES + tristate "Netfilter nf_tables counter module" + +config NFT_LOG + depends on NF_TABLES + tristate "Netfilter nf_tables log module" + +config NFT_LIMIT + depends on NF_TABLES + tristate "Netfilter nf_tables limit module" + config NETFILTER_XTABLES tristate "Netfilter Xtables support (required for ip_tables)" default m if NETFILTER_ADVANCED=n diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index c3a0a12907f6..1ca3f3932826 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -64,6 +64,22 @@ obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o # SYNPROXY obj-$(CONFIG_NETFILTER_SYNPROXY) += nf_synproxy_core.o +# nf_tables +nf_tables-objs += nf_tables_core.o nf_tables_api.o +nf_tables-objs += nft_immediate.o nft_cmp.o nft_lookup.o +nf_tables-objs += nft_bitwise.o nft_byteorder.o nft_payload.o + +obj-$(CONFIG_NF_TABLES) += nf_tables.o +obj-$(CONFIG_NFT_EXTHDR) += nft_exthdr.o +obj-$(CONFIG_NFT_META) += nft_meta.o +obj-$(CONFIG_NFT_CT) += nft_ct.o +obj-$(CONFIG_NFT_LIMIT) += nft_limit.o +#nf_tables-objs += nft_meta_target.o +obj-$(CONFIG_NFT_SET) += nft_set.o +obj-$(CONFIG_NFT_HASH) += nft_hash.o +obj-$(CONFIG_NFT_COUNTER) += nft_counter.o +obj-$(CONFIG_NFT_LOG) += nft_log.o + # generic X tables obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c new file mode 100644 index 000000000000..7d59c89c6c75 --- /dev/null +++ b/net/netfilter/nf_tables_api.c @@ -0,0 +1,1760 @@ +/* + * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Development of this code funded by Astaro AG (http://www.astaro.com/) + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/skbuff.h> +#include <linux/netlink.h> +#include <linux/netfilter.h> +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables_core.h> +#include <net/netfilter/nf_tables.h> +#include <net/sock.h> + +static LIST_HEAD(nf_tables_afinfo); +static LIST_HEAD(nf_tables_expressions); + +/** + * nft_register_afinfo - register nf_tables address family info + * + * @afi: address family info to register + * + * Register the address family for use with nf_tables. Returns zero on + * success or a negative errno code otherwise. + */ +int nft_register_afinfo(struct nft_af_info *afi) +{ + INIT_LIST_HEAD(&afi->tables); + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_add_tail(&afi->list, &nf_tables_afinfo); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + return 0; +} +EXPORT_SYMBOL_GPL(nft_register_afinfo); + +/** + * nft_unregister_afinfo - unregister nf_tables address family info + * + * @afi: address family info to unregister + * + * Unregister the address family for use with nf_tables. + */ +void nft_unregister_afinfo(struct nft_af_info *afi) +{ + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_del(&afi->list); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); +} +EXPORT_SYMBOL_GPL(nft_unregister_afinfo); + +static struct nft_af_info *nft_afinfo_lookup(int family) +{ + struct nft_af_info *afi; + + list_for_each_entry(afi, &nf_tables_afinfo, list) { + if (afi->family == family) + return afi; + } + return NULL; +} + +static struct nft_af_info *nf_tables_afinfo_lookup(int family, bool autoload) +{ + struct nft_af_info *afi; + + afi = nft_afinfo_lookup(family); + if (afi != NULL) + return afi; +#ifdef CONFIG_MODULES + if (autoload) { + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + request_module("nft-afinfo-%u", family); + nfnl_lock(NFNL_SUBSYS_NFTABLES); + afi = nft_afinfo_lookup(family); + if (afi != NULL) + return ERR_PTR(-EAGAIN); + } +#endif + return ERR_PTR(-EAFNOSUPPORT); +} + +/* + * Tables + */ + +static struct nft_table *nft_table_lookup(const struct nft_af_info *afi, + const struct nlattr *nla) +{ + struct nft_table *table; + + list_for_each_entry(table, &afi->tables, list) { + if (!nla_strcmp(nla, table->name)) + return table; + } + return NULL; +} + +static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi, + const struct nlattr *nla, + bool autoload) +{ + struct nft_table *table; + + if (nla == NULL) + return ERR_PTR(-EINVAL); + + table = nft_table_lookup(afi, nla); + if (table != NULL) + return table; + +#ifdef CONFIG_MODULES + if (autoload) { + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + request_module("nft-table-%u-%*.s", afi->family, + nla_len(nla)-1, (const char *)nla_data(nla)); + nfnl_lock(NFNL_SUBSYS_NFTABLES); + if (nft_table_lookup(afi, nla)) + return ERR_PTR(-EAGAIN); + } +#endif + return ERR_PTR(-ENOENT); +} + +static inline u64 nf_tables_alloc_handle(struct nft_table *table) +{ + return ++table->hgenerator; +} + +static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { + [NFTA_TABLE_NAME] = { .type = NLA_STRING }, +}; + +static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq, + int event, u32 flags, int family, + const struct nft_table *table) +{ + struct nlmsghdr *nlh; + struct nfgenmsg *nfmsg; + + event |= NFNL_SUBSYS_NFTABLES << 8; + nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); + if (nlh == NULL) + goto nla_put_failure; + + nfmsg = nlmsg_data(nlh); + nfmsg->nfgen_family = family; + nfmsg->version = NFNETLINK_V0; + nfmsg->res_id = 0; + + if (nla_put_string(skb, NFTA_TABLE_NAME, table->name)) + goto nla_put_failure; + + return nlmsg_end(skb, nlh); + +nla_put_failure: + nlmsg_trim(skb, nlh); + return -1; +} + +static int nf_tables_table_notify(const struct sk_buff *oskb, + const struct nlmsghdr *nlh, + const struct nft_table *table, + int event, int family) +{ + struct sk_buff *skb; + u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; + u32 seq = nlh ? nlh->nlmsg_seq : 0; + struct net *net = oskb ? sock_net(oskb->sk) : &init_net; + bool report; + int err; + + report = nlh ? nlmsg_report(nlh) : false; + if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) + return 0; + + err = -ENOBUFS; + skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); + if (skb == NULL) + goto err; + + err = nf_tables_fill_table_info(skb, portid, seq, event, 0, + family, table); + if (err < 0) { + kfree_skb(skb); + goto err; + } + + err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, + GFP_KERNEL); +err: + if (err < 0) + nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); + return err; +} + +static int nf_tables_dump_tables(struct sk_buff *skb, + struct netlink_callback *cb) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + unsigned int idx = 0, s_idx = cb->args[0]; + int family = nfmsg->nfgen_family; + + list_for_each_entry(afi, &nf_tables_afinfo, list) { + if (family != NFPROTO_UNSPEC && family != afi->family) + continue; + + list_for_each_entry(table, &afi->tables, list) { + if (idx < s_idx) + goto cont; + if (idx > s_idx) + memset(&cb->args[1], 0, + sizeof(cb->args) - sizeof(cb->args[0])); + if (nf_tables_fill_table_info(skb, + NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, + NFT_MSG_NEWTABLE, + NLM_F_MULTI, + afi->family, table) < 0) + goto done; +cont: + idx++; + } + } +done: + cb->args[0] = idx; + return skb->len; +} + +static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + struct sk_buff *skb2; + int family = nfmsg->nfgen_family; + int err; + + if (nlh->nlmsg_flags & NLM_F_DUMP) { + struct netlink_dump_control c = { + .dump = nf_tables_dump_tables, + }; + return netlink_dump_start(nlsk, skb, nlh, &c); + } + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb2) + return -ENOMEM; + + err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid, + nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, + family, table); + if (err < 0) + goto err; + + return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); + +err: + kfree_skb(skb2); + return err; +} + +static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nlattr *name; + struct nft_af_info *afi; + struct nft_table *table; + int family = nfmsg->nfgen_family; + + afi = nf_tables_afinfo_lookup(family, true); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + name = nla[NFTA_TABLE_NAME]; + table = nf_tables_table_lookup(afi, name, false); + if (IS_ERR(table)) { + if (PTR_ERR(table) != -ENOENT) + return PTR_ERR(table); + table = NULL; + } + + if (table != NULL) { + if (nlh->nlmsg_flags & NLM_F_EXCL) + return -EEXIST; + if (nlh->nlmsg_flags & NLM_F_REPLACE) + return -EOPNOTSUPP; + return 0; + } + + table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); + if (table == NULL) + return -ENOMEM; + + nla_strlcpy(table->name, name, nla_len(name)); + INIT_LIST_HEAD(&table->chains); + + list_add_tail(&table->list, &afi->tables); + nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); + return 0; +} + +static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + struct nft_af_info *afi; + struct nft_table *table; + int family = nfmsg->nfgen_family; + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + if (table->flags & NFT_TABLE_BUILTIN) + return -EOPNOTSUPP; + + if (table->use) + return -EBUSY; + + list_del(&table->list); + nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family); + kfree(table); + return 0; +} + +static struct nft_table *__nf_tables_table_lookup(const struct nft_af_info *afi, + const char *name) +{ + struct nft_table *table; + + list_for_each_entry(table, &afi->tables, list) { + if (!strcmp(name, table->name)) + return table; + } + + return ERR_PTR(-ENOENT); +} + +static int nf_tables_chain_notify(const struct sk_buff *oskb, + const struct nlmsghdr *nlh, + const struct nft_table *table, + const struct nft_chain *chain, + int event, int family); + +/** + * nft_register_table - register a built-in table + * + * @table: the table to register + * @family: protocol family to register table with + * + * Register a built-in table for use with nf_tables. Returns zero on + * success or a negative errno code otherwise. + */ +int nft_register_table(struct nft_table *table, int family) +{ + struct nft_af_info *afi; + struct nft_table *t; + struct nft_chain *chain; + int err; + + nfnl_lock(NFNL_SUBSYS_NFTABLES); +again: + afi = nf_tables_afinfo_lookup(family, true); + if (IS_ERR(afi)) { + err = PTR_ERR(afi); + if (err == -EAGAIN) + goto again; + goto err; + } + + t = __nf_tables_table_lookup(afi, table->name); + if (IS_ERR(t)) { + err = PTR_ERR(t); + if (err != -ENOENT) + goto err; + t = NULL; + } + + if (t != NULL) { + err = -EEXIST; + goto err; + } + + table->flags |= NFT_TABLE_BUILTIN; + list_add_tail(&table->list, &afi->tables); + nf_tables_table_notify(NULL, NULL, table, NFT_MSG_NEWTABLE, family); + list_for_each_entry(chain, &table->chains, list) + nf_tables_chain_notify(NULL, NULL, table, chain, + NFT_MSG_NEWCHAIN, family); + err = 0; +err: + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + return err; +} +EXPORT_SYMBOL_GPL(nft_register_table); + +/** + * nft_unregister_table - unregister a built-in table + * + * @table: the table to unregister + * @family: protocol family to unregister table with + * + * Unregister a built-in table for use with nf_tables. + */ +void nft_unregister_table(struct nft_table *table, int family) +{ + struct nft_chain *chain; + + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_del(&table->list); + list_for_each_entry(chain, &table->chains, list) + nf_tables_chain_notify(NULL, NULL, table, chain, + NFT_MSG_DELCHAIN, family); + nf_tables_table_notify(NULL, NULL, table, NFT_MSG_DELTABLE, family); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); +} +EXPORT_SYMBOL_GPL(nft_unregister_table); + +/* + * Chains + */ + +static struct nft_chain * +nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) +{ + struct nft_chain *chain; + + list_for_each_entry(chain, &table->chains, list) { + if (chain->handle == handle) + return chain; + } + + return ERR_PTR(-ENOENT); +} + +static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, + const struct nlattr *nla) +{ + struct nft_chain *chain; + + if (nla == NULL) + return ERR_PTR(-EINVAL); + + list_for_each_entry(chain, &table->chains, list) { + if (!nla_strcmp(nla, chain->name)) + return chain; + } + + return ERR_PTR(-ENOENT); +} + +static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { + [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, + [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, + [NFTA_CHAIN_NAME] = { .type = NLA_STRING, + .len = NFT_CHAIN_MAXNAMELEN - 1 }, + [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, +}; + +static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { + [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, + [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, +}; + +static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq, + int event, u32 flags, int family, + const struct nft_table *table, + const struct nft_chain *chain) +{ + struct nlmsghdr *nlh; + struct nfgenmsg *nfmsg; + + event |= NFNL_SUBSYS_NFTABLES << 8; + nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); + if (nlh == NULL) + goto nla_put_failure; + + nfmsg = nlmsg_data(nlh); + nfmsg->nfgen_family = family; + nfmsg->version = NFNETLINK_V0; + nfmsg->res_id = 0; + + if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) + goto nla_put_failure; + if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) + goto nla_put_failure; + if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) + goto nla_put_failure; + + if (chain->flags & NFT_BASE_CHAIN) { + const struct nf_hook_ops *ops = &nft_base_chain(chain)->ops; + struct nlattr *nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); + if (nest == NULL) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) + goto nla_put_failure; + nla_nest_end(skb, nest); + } + + return nlmsg_end(skb, nlh); + +nla_put_failure: + nlmsg_trim(skb, nlh); + return -1; +} + +static int nf_tables_chain_notify(const struct sk_buff *oskb, + const struct nlmsghdr *nlh, + const struct nft_table *table, + const struct nft_chain *chain, + int event, int family) +{ + struct sk_buff *skb; + u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; + struct net *net = oskb ? sock_net(oskb->sk) : &init_net; + u32 seq = nlh ? nlh->nlmsg_seq : 0; + bool report; + int err; + + report = nlh ? nlmsg_report(nlh) : false; + if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) + return 0; + + err = -ENOBUFS; + skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); + if (skb == NULL) + goto err; + + err = nf_tables_fill_chain_info(skb, portid, seq, event, 0, family, + table, chain); + if (err < 0) { + kfree_skb(skb); + goto err; + } + + err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, + GFP_KERNEL); +err: + if (err < 0) + nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); + return err; +} + +static int nf_tables_dump_chains(struct sk_buff *skb, + struct netlink_callback *cb) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + const struct nft_chain *chain; + unsigned int idx = 0, s_idx = cb->args[0]; + int family = nfmsg->nfgen_family; + + list_for_each_entry(afi, &nf_tables_afinfo, list) { + if (family != NFPROTO_UNSPEC && family != afi->family) + continue; + + list_for_each_entry(table, &afi->tables, list) { + list_for_each_entry(chain, &table->chains, list) { + if (idx < s_idx) + goto cont; + if (idx > s_idx) + memset(&cb->args[1], 0, + sizeof(cb->args) - sizeof(cb->args[0])); + if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, + NFT_MSG_NEWCHAIN, + NLM_F_MULTI, + afi->family, table, chain) < 0) + goto done; +cont: + idx++; + } + } + } +done: + cb->args[0] = idx; + return skb->len; +} + + +static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nft_af_info *afi; + const struct nft_table *table; + const struct nft_chain *chain; + struct sk_buff *skb2; + int family = nfmsg->nfgen_family; + int err; + + if (nlh->nlmsg_flags & NLM_F_DUMP) { + struct netlink_dump_control c = { + .dump = nf_tables_dump_chains, + }; + return netlink_dump_start(nlsk, skb, nlh, &c); + } + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); + if (IS_ERR(chain)) + return PTR_ERR(chain); + + skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb2) + return -ENOMEM; + + err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid, + nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, + family, table, chain); + if (err < 0) + goto err; + + return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); + +err: + kfree_skb(skb2); + return err; +} + +static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nlattr * uninitialized_var(name); + const struct nft_af_info *afi; + struct nft_table *table; + struct nft_chain *chain; + struct nft_base_chain *basechain; + struct nlattr *ha[NFTA_HOOK_MAX + 1]; + int family = nfmsg->nfgen_family; + u64 handle = 0; + int err; + bool create; + + create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; + + afi = nf_tables_afinfo_lookup(family, true); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], create); + if (IS_ERR(table)) + return PTR_ERR(table); + + if (table->use == UINT_MAX) + return -EOVERFLOW; + + chain = NULL; + name = nla[NFTA_CHAIN_NAME]; + + if (nla[NFTA_CHAIN_HANDLE]) { + handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); + chain = nf_tables_chain_lookup_byhandle(table, handle); + if (IS_ERR(chain)) + return PTR_ERR(chain); + } else { + chain = nf_tables_chain_lookup(table, name); + if (IS_ERR(chain)) { + if (PTR_ERR(chain) != -ENOENT) + return PTR_ERR(chain); + chain = NULL; + } + } + + if (chain != NULL) { + if (nlh->nlmsg_flags & NLM_F_EXCL) + return -EEXIST; + if (nlh->nlmsg_flags & NLM_F_REPLACE) + return -EOPNOTSUPP; + + if (nla[NFTA_CHAIN_HANDLE] && name && + !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) + return -EEXIST; + + if (nla[NFTA_CHAIN_HANDLE] && name) + nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); + + goto notify; + } + + if (nla[NFTA_CHAIN_HOOK]) { + struct nf_hook_ops *ops; + + err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], + nft_hook_policy); + if (err < 0) + return err; + if (ha[NFTA_HOOK_HOOKNUM] == NULL || + ha[NFTA_HOOK_PRIORITY] == NULL) + return -EINVAL; + if (ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])) >= afi->nhooks) + return -EINVAL; + + basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); + if (basechain == NULL) + return -ENOMEM; + chain = &basechain->chain; + + ops = &basechain->ops; + ops->pf = family; + ops->owner = afi->owner; + ops->hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); + ops->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); + ops->priv = chain; + ops->hook = nft_do_chain; + if (afi->hooks[ops->hooknum]) + ops->hook = afi->hooks[ops->hooknum]; + + chain->flags |= NFT_BASE_CHAIN; + } else { + chain = kzalloc(sizeof(*chain), GFP_KERNEL); + if (chain == NULL) + return -ENOMEM; + } + + INIT_LIST_HEAD(&chain->rules); + chain->handle = nf_tables_alloc_handle(table); + nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); + + list_add_tail(&chain->list, &table->chains); + table->use++; +notify: + nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN, + family); + return 0; +} + +static void nf_tables_rcu_chain_destroy(struct rcu_head *head) +{ + struct nft_chain *chain = container_of(head, struct nft_chain, rcu_head); + + BUG_ON(chain->use > 0); + + if (chain->flags & NFT_BASE_CHAIN) + kfree(nft_base_chain(chain)); + else + kfree(chain); +} + +static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const nla[]) +{ + const struct nfgenmsg *nfmsg = nlmsg_data(nlh); + const struct nft_af_info *afi; + struct nft_table *table; + struct nft_chain *chain; + int family = nfmsg->nfgen_family; + + afi = nf_tables_afinfo_lookup(family, false); + if (IS_ERR(afi)) + return PTR_ERR(afi); + + table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], false); + if (IS_ERR(table)) + return PTR_ERR(table); + + chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); + if (IS_ERR(chain)) + return PTR_ERR(chain); + + if (chain->flags & NFT_CHAIN_BUILTIN) + return -EOPNOTSUPP; + + if (!list_empty(&chain->rules)) + return -EBUSY; + + list_del(&chain->list); + table->use--; + + if (chain->flags & NFT_BASE_CHAIN) + nf_unregister_hook(&nft_base_chain(chain)->ops); + + nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN, + family); + + /* Make sure all rule references are gone before this is released */ + call_rcu(&chain->rcu_head, nf_tables_rcu_chain_destroy); + return 0; +} + +static void nft_ctx_init(struct nft_ctx *ctx, + const struct nft_af_info *afi, + const struct nft_table *table, + const struct nft_chain *chain) +{ + ctx->afi = afi; + ctx->table = table; + ctx->chain = chain; +} + +/* + * Expressions + */ + +/** + * nft_register_expr - register nf_tables expr operations + * @ops: expr operations + * + * Registers the expr operations for use with nf_tables. Returns zero on + * success or a negative errno code otherwise. + */ +int nft_register_expr(struct nft_expr_ops *ops) +{ + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_add_tail(&ops->list, &nf_tables_expressions); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + return 0; +} +EXPORT_SYMBOL_GPL(nft_register_expr); + +/** + * nft_unregister_expr - unregister nf_tables expr operations + * @ops: expr operations + * + * Unregisters the expr operations for use with nf_tables. + */ +void nft_unregister_expr(struct nft_expr_ops *ops) +{ + nfnl_lock(NFNL_SUBSYS_NFTABLES); + list_del(&ops->list); + nfnl_unlock(NFNL_SUBSYS_NFTABLES); +} +EXPORT_SYMBOL_GPL(nft_unregister_expr); + +static const struct nft_expr_ops *__nft_expr_ops_get(struct nlattr *nla) +{ + const struct nft_expr_ops *ops; + + list_for_each_entry(ops, &nf_tables_expressions, list) { + if (!nla_strcmp(nla, ops->name)) + return ops; + } + return NULL; +} + +static const struct nft_expr_ops *nft_expr_ops_get(struct nlattr *nla) +{ + const struct nft_expr_ops *ops; + + if (nla == NULL) + return ERR_PTR(-EINVAL); + + ops = __nft_expr_ops_get(nla); + if (ops != NULL && try_module_get(ops->owner)) + return ops; + +#ifdef CONFIG_MODULES + if (ops == NULL) { + nfnl_unlock(NFNL_SUBSYS_NFTABLES); + request_module("nft-expr-%.*s", + nla_len(nla), (char *)nla_data(nla)); + nfnl_lock(NFNL_SUBSYS_NFTABLES); + if (__nft_expr_ops_get(nla)) + return ERR_PTR(-EAGAIN); + } +#endif + return ERR_PTR(-ENOENT); +} + +static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { + [NFTA_EXPR_NAME] = { .type = NLA_STRING }, + [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, +}; + +static int nf_tables_fill_expr_info(struct sk_buff *skb, + const struct nft_expr *expr) +{ + if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->name)) + goto nla_put_failure; + + if (expr->ops->dump) { + struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); + if (data == NULL) + goto nla_put_failure; + if (expr->ops->dump(skb, expr) < 0) + goto nla_put_failure; + nla_nest_end(skb, data); + } + + return skb->len; + +nla_put_failure: + return -1; +}; + +struct nft_expr_info { + const struct nft_expr_ops *ops; + struct nlattr *tb[NFTA_EXPR_MAX + 1]; +}; + +static int nf_tables_expr_parse(const struct nlattr *nla, + struct nft_expr_info *info) +{ + const struct nft_expr_ops *ops; + int err; + + err = nla_parse_nested(info->tb, NFTA_EXPR_MAX, nla, nft_expr_policy); + if (err < 0) + return err; + + ops = nft_expr_ops_get(info->tb[NFTA_EXPR_NAME]); + if (IS_ERR(ops)) + return PTR_ERR(ops); + info->ops = ops; + return 0; +} + +static int nf_tables_newexpr(const struct nft_ctx *ctx, + struct nft_expr_info *info, + struct nft_expr *expr) +{ + const struct nft_expr_ops *ops = info->ops; + int err; + + expr->ops = ops; + if (ops->init) { + struct nlattr *ma[ops->maxattr + 1]; + + if (info->tb[NFTA_EXPR_DATA]) { + err = nla_parse_nested(ma, ops->maxattr, + info->tb[NFTA_EXPR_DATA], + ops->policy); + if (err < 0) + goto err1; + } else + memset(ma, 0, sizeof(ma[0]) * (ops->maxattr + 1)); + + err = ops->init(ctx, expr, (const struct nlattr **)ma); + if (err < 0) + goto err1; + } + + info->ops = NULL; + return 0; + +err1: + expr->ops = NULL; + return err; +} + +static void nf_tables_expr_destroy(struct nft_expr *expr) +{ + if (expr->ops->destroy) + expr->ops->destroy(expr); + module_put(expr->ops->owner); +} |