| /* |
| * Copyright (c) 2007-2009 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/net_namespace.h> |
| #include <net/sock.h> |
| |
| 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 net *net, struct nft_af_info *afi) |
| { |
| INIT_LIST_HEAD(&afi->tables); |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| list_add_tail(&afi->list, &net->nft.af_info); |
| 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(struct net *net, int family) |
| { |
| struct nft_af_info *afi; |
| |
| list_for_each_entry(afi, &net->nft.af_info, list) { |
| if (afi->family == family) |
| return afi; |
| } |
| return NULL; |
| } |
| |
| static struct nft_af_info * |
| nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) |
| { |
| struct nft_af_info *afi; |
| |
| afi = nft_afinfo_lookup(net, 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(net, 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) |
| { |
| struct nft_table *table; |
| |
| if (nla == NULL) |
| return ERR_PTR(-EINVAL); |
| |
| table = nft_table_lookup(afi, nla); |
| if (table != NULL) |
| return table; |
| |
| return ERR_PTR(-ENOENT); |
| } |
| |
| static inline u64 nf_tables_alloc_handle(struct nft_table *table) |
| { |
| return ++table->hgenerator; |
| } |
| |
| static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
| |
| static const struct nf_chain_type * |
| __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
| { |
| int i; |
| |
| for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
| if (chain_type[family][i] != NULL && |
| !nla_strcmp(nla, chain_type[family][i]->name)) |
| return chain_type[family][i]; |
| } |
| return NULL; |
| } |
| |
| static const struct nf_chain_type * |
| nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
| const struct nlattr *nla, |
| bool autoload) |
| { |
| const struct nf_chain_type *type; |
| |
| type = __nf_tables_chain_type_lookup(afi->family, nla); |
| if (type != NULL) |
| return type; |
| #ifdef CONFIG_MODULES |
| if (autoload) { |
| nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| request_module("nft-chain-%u-%.*s", afi->family, |
| nla_len(nla), (const char *)nla_data(nla)); |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| type = __nf_tables_chain_type_lookup(afi->family, nla); |
| if (type != NULL) |
| return ERR_PTR(-EAGAIN); |
| } |
| #endif |
| return ERR_PTR(-ENOENT); |
| } |
| |
| static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
| [NFTA_TABLE_NAME] = { .type = NLA_STRING }, |
| [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
| }; |
| |
| 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) || |
| nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
| nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) |
| 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]; |
| struct net *net = sock_net(skb->sk); |
| int family = nfmsg->nfgen_family; |
| |
| list_for_each_entry(afi, &net->nft.af_info, 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; |
| struct net *net = sock_net(skb->sk); |
| 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(net, family, false); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
| 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_table_enable(const struct nft_af_info *afi, |
| struct nft_table *table) |
| { |
| struct nft_chain *chain; |
| int err, i = 0; |
| |
| list_for_each_entry(chain, &table->chains, list) { |
| if (!(chain->flags & NFT_BASE_CHAIN)) |
| continue; |
| |
| err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
| if (err < 0) |
| goto err; |
| |
| i++; |
| } |
| return 0; |
| err: |
| list_for_each_entry(chain, &table->chains, list) { |
| if (!(chain->flags & NFT_BASE_CHAIN)) |
| continue; |
| |
| if (i-- <= 0) |
| break; |
| |
| nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
| } |
| return err; |
| } |
| |
| static int nf_tables_table_disable(const struct nft_af_info *afi, |
| struct nft_table *table) |
| { |
| struct nft_chain *chain; |
| |
| list_for_each_entry(chain, &table->chains, list) { |
| if (chain->flags & NFT_BASE_CHAIN) |
| nf_unregister_hooks(nft_base_chain(chain)->ops, |
| afi->nops); |
| } |
| |
| return 0; |
| } |
| |
| static int nf_tables_updtable(struct sock *nlsk, struct sk_buff *skb, |
| const struct nlmsghdr *nlh, |
| const struct nlattr * const nla[], |
| struct nft_af_info *afi, struct nft_table *table) |
| { |
| const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| int family = nfmsg->nfgen_family, ret = 0; |
| |
| if (nla[NFTA_TABLE_FLAGS]) { |
| u32 flags; |
| |
| flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); |
| if (flags & ~NFT_TABLE_F_DORMANT) |
| return -EINVAL; |
| |
| if ((flags & NFT_TABLE_F_DORMANT) && |
| !(table->flags & NFT_TABLE_F_DORMANT)) { |
| ret = nf_tables_table_disable(afi, table); |
| if (ret >= 0) |
| table->flags |= NFT_TABLE_F_DORMANT; |
| } else if (!(flags & NFT_TABLE_F_DORMANT) && |
| table->flags & NFT_TABLE_F_DORMANT) { |
| ret = nf_tables_table_enable(afi, table); |
| if (ret >= 0) |
| table->flags &= ~NFT_TABLE_F_DORMANT; |
| } |
| if (ret < 0) |
| goto err; |
| } |
| |
| nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family); |
| err: |
| return ret; |
| } |
| |
| 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; |
| struct net *net = sock_net(skb->sk); |
| int family = nfmsg->nfgen_family; |
| u32 flags = 0; |
| |
| afi = nf_tables_afinfo_lookup(net, family, true); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| name = nla[NFTA_TABLE_NAME]; |
| table = nf_tables_table_lookup(afi, name); |
| 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 nf_tables_updtable(nlsk, skb, nlh, nla, afi, table); |
| } |
| |
| if (nla[NFTA_TABLE_FLAGS]) { |
| flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); |
| if (flags & ~NFT_TABLE_F_DORMANT) |
| return -EINVAL; |
| } |
| |
| if (!try_module_get(afi->owner)) |
| return -EAFNOSUPPORT; |
| |
| table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); |
| if (table == NULL) { |
| module_put(afi->owner); |
| return -ENOMEM; |
| } |
| |
| nla_strlcpy(table->name, name, nla_len(name)); |
| INIT_LIST_HEAD(&table->chains); |
| INIT_LIST_HEAD(&table->sets); |
| table->flags = flags; |
| |
| 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; |
| struct net *net = sock_net(skb->sk); |
| int family = nfmsg->nfgen_family; |
| |
| afi = nf_tables_afinfo_lookup(net, family, false); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
| if (IS_ERR(table)) |
| return PTR_ERR(table); |
| |
| if (!list_empty(&table->chains) || !list_empty(&table->sets)) |
| return -EBUSY; |
| |
| list_del(&table->list); |
| nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family); |
| kfree(table); |
| module_put(afi->owner); |
| return 0; |
| } |
| |
| int nft_register_chain_type(const struct nf_chain_type *ctype) |
| { |
| int err = 0; |
| |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| if (chain_type[ctype->family][ctype->type] != NULL) { |
| err = -EBUSY; |
| goto out; |
| } |
| chain_type[ctype->family][ctype->type] = ctype; |
| out: |
| nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(nft_register_chain_type); |
| |
| void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
| { |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| chain_type[ctype->family][ctype->type] = NULL; |
| nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| } |
| EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
| |
| /* |
| * 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 }, |
| [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
| [NFTA_CHAIN_TYPE] = { .type = NLA_NUL_STRING }, |
| [NFTA_CHAIN_COUNTERS] = { .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 nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
| { |
| struct nft_stats *cpu_stats, total; |
| struct nlattr *nest; |
| int cpu; |
| |
| memset(&total, 0, sizeof(total)); |
| for_each_possible_cpu(cpu) { |
| cpu_stats = per_cpu_ptr(stats, cpu); |
| total.pkts += cpu_stats->pkts; |
| total.bytes += cpu_stats->bytes; |
| } |
| nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); |
| if (nest == NULL) |
| goto nla_put_failure; |
| |
| if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || |
| nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) |
| goto nla_put_failure; |
| |
| nla_nest_end(skb, nest); |
| return 0; |
| |
| nla_put_failure: |
| return -ENOSPC; |
| } |
| |
| 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 nft_base_chain *basechain = nft_base_chain(chain); |
| const struct nf_hook_ops *ops = &basechain->ops[0]; |
| struct nlattr *nest; |
| |
| 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); |
| |
| if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
| htonl(basechain->policy))) |
| goto nla_put_failure; |
| |
| if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
| goto nla_put_failure; |
| |
| if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) |
| goto nla_put_failure; |
| } |
| |
| if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
| goto nla_put_failure; |
| |
| 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]; |
| struct net *net = sock_net(skb->sk); |
| int family = nfmsg->nfgen_family; |
| |
| list_for_each_entry(afi, &net->nft.af_info, 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; |
| struct net *net = sock_net(skb->sk); |
| 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(net, family, false); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
| 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 const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
| [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, |
| [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, |
| }; |
| |
| static int |
| nf_tables_counters(struct nft_base_chain *chain, const struct nlattr *attr) |
| { |
| struct nlattr *tb[NFTA_COUNTER_MAX+1]; |
| struct nft_stats __percpu *newstats; |
| struct nft_stats *stats; |
| int err; |
| |
| err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); |
| if (err < 0) |
| return err; |
| |
| if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) |
| return -EINVAL; |
| |
| newstats = alloc_percpu(struct nft_stats); |
| if (newstats == NULL) |
| return -ENOMEM; |
| |
| /* Restore old counters on this cpu, no problem. Per-cpu statistics |
| * are not exposed to userspace. |
| */ |
| stats = this_cpu_ptr(newstats); |
| stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); |
| stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); |
| |
| if (chain->stats) { |
| struct nft_stats __percpu *oldstats = |
| nft_dereference(chain->stats); |
| |
| rcu_assign_pointer(chain->stats, newstats); |
| synchronize_rcu(); |
| free_percpu(oldstats); |
| } else |
| rcu_assign_pointer(chain->stats, newstats); |
| |
| return 0; |
| } |
| |
| 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 = NULL; |
| struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
| struct net *net = sock_net(skb->sk); |
| int family = nfmsg->nfgen_family; |
| u8 policy = NF_ACCEPT; |
| u64 handle = 0; |
| unsigned int i; |
| int err; |
| bool create; |
| |
| create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| |
| afi = nf_tables_afinfo_lookup(net, family, true); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
| if (IS_ERR(table)) |
| return PTR_ERR(table); |
| |
| 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 (nla[NFTA_CHAIN_POLICY]) { |
| if ((chain != NULL && |
| !(chain->flags & NFT_BASE_CHAIN)) || |
| nla[NFTA_CHAIN_HOOK] == NULL) |
| return -EOPNOTSUPP; |
| |
| policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
| switch (policy) { |
| case NF_DROP: |
| case NF_ACCEPT: |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| 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_COUNTERS]) { |
| if (!(chain->flags & NFT_BASE_CHAIN)) |
| return -EOPNOTSUPP; |
| |
| err = nf_tables_counters(nft_base_chain(chain), |
| nla[NFTA_CHAIN_COUNTERS]); |
| if (err < 0) |
| return err; |
| } |
| |
| if (nla[NFTA_CHAIN_POLICY]) |
| nft_base_chain(chain)->policy = policy; |
| |
| if (nla[NFTA_CHAIN_HANDLE] && name) |
| nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
| |
| goto notify; |
| } |
| |
| if (table->use == UINT_MAX) |
| return -EOVERFLOW; |
| |
| if (nla[NFTA_CHAIN_HOOK]) { |
| const struct nf_chain_type *type; |
| struct nf_hook_ops *ops; |
| nf_hookfn *hookfn; |
| u32 hooknum, priority; |
| |
| type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
| if (nla[NFTA_CHAIN_TYPE]) { |
| type = nf_tables_chain_type_lookup(afi, |
| nla[NFTA_CHAIN_TYPE], |
| create); |
| if (IS_ERR(type)) |
| return PTR_ERR(type); |
| } |
| |
| 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; |
| |
| hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); |
| if (hooknum >= afi->nhooks) |
| return -EINVAL; |
| priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
| |
| if (!(type->hook_mask & (1 << hooknum))) |
| return -EOPNOTSUPP; |
| if (!try_module_get(type->owner)) |
| return -ENOENT; |
| hookfn = type->hooks[hooknum]; |
| |
| basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
| if (basechain == NULL) |
| return -ENOMEM; |
| |
| if (nla[NFTA_CHAIN_COUNTERS]) { |
| err = nf_tables_counters(basechain, |
| nla[NFTA_CHAIN_COUNTERS]); |
| if (err < 0) { |
| module_put(type->owner); |
| kfree(basechain); |
| return err; |
| } |
| } else { |
| struct nft_stats __percpu *newstats; |
| |
| newstats = alloc_percpu(struct nft_stats); |
| if (newstats == NULL) { |
| module_put(type->owner); |
| kfree(basechain); |
| return -ENOMEM; |
| } |
| rcu_assign_pointer(basechain->stats, newstats); |
| } |
| |
| basechain->type = type; |
| chain = &basechain->chain; |
| |
| for (i = 0; i < afi->nops; i++) { |
| ops = &basechain->ops[i]; |
| ops->pf = family; |
| ops->owner = afi->owner; |
| ops->hooknum = hooknum; |
| ops->priority = priority; |
| ops->priv = chain; |
| ops->hook = afi->hooks[ops->hooknum]; |
| if (hookfn) |
| ops->hook = hookfn; |
| if (afi->hook_ops_init) |
| afi->hook_ops_init(ops, i); |
| } |
| |
| chain->flags |= NFT_BASE_CHAIN; |
| basechain->policy = policy; |
| } else { |
| chain = kzalloc(sizeof(*chain), GFP_KERNEL); |
| if (chain == NULL) |
| return -ENOMEM; |
| } |
| |
| INIT_LIST_HEAD(&chain->rules); |
| chain->handle = nf_tables_alloc_handle(table); |
| chain->net = net; |
| chain->table = table; |
| nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
| |
| if (!(table->flags & NFT_TABLE_F_DORMANT) && |
| chain->flags & NFT_BASE_CHAIN) { |
| err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
| if (err < 0) { |
| module_put(basechain->type->owner); |
| free_percpu(basechain->stats); |
| kfree(basechain); |
| return err; |
| } |
| } |
| 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_chain_destroy(struct nft_chain *chain) |
| { |
| BUG_ON(chain->use > 0); |
| |
| if (chain->flags & NFT_BASE_CHAIN) { |
| module_put(nft_base_chain(chain)->type->owner); |
| free_percpu(nft_base_chain(chain)->stats); |
| 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; |
| struct net *net = sock_net(skb->sk); |
| int family = nfmsg->nfgen_family; |
| |
| afi = nf_tables_afinfo_lookup(net, family, false); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
| 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 (!list_empty(&chain->rules) || chain->use > 0) |
| return -EBUSY; |
| |
| list_del(&chain->list); |
| table->use--; |
| |
| if (!(table->flags & NFT_TABLE_F_DORMANT) && |
| chain->flags & NFT_BASE_CHAIN) |
| nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
| |
| nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN, |
| family); |
| |
| /* Make sure all rule references are gone before this is released */ |
| synchronize_rcu(); |
| |
| nf_tables_chain_destroy(chain); |
| return 0; |
| } |
| |
| static void nft_ctx_init(struct nft_ctx *ctx, |
| const struct sk_buff *skb, |
| const struct nlmsghdr *nlh, |
| const struct nft_af_info *afi, |
| const struct nft_table *table, |
| const struct nft_chain *chain, |
| const struct nlattr * const *nla) |
| { |
| ctx->net = sock_net(skb->sk); |
| ctx->skb = skb; |
| ctx->nlh = nlh; |
| ctx->afi = afi; |
| ctx->table = table; |
| ctx->chain = chain; |
| ctx->nla = nla; |
| } |
| |
| /* |
| * Expressions |
| */ |
| |
| /** |
| * nft_register_expr - register nf_tables expr type |
| * @ops: expr type |
| * |
| * Registers the expr type for use with nf_tables. Returns zero on |
| * success or a negative errno code otherwise. |
| */ |
| int nft_register_expr(struct nft_expr_type *type) |
| { |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| list_add_tail(&type->list, &nf_tables_expressions); |
| nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nft_register_expr); |
| |
| /** |
| * nft_unregister_expr - unregister nf_tables expr type |
| * @ops: expr type |
| * |
| * Unregisters the expr typefor use with nf_tables. |
| */ |
| void nft_unregister_expr(struct nft_expr_type *type) |
| { |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| list_del(&type->list); |
| nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| } |
| EXPORT_SYMBOL_GPL(nft_unregister_expr); |
| |
| static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
| struct nlattr *nla) |
| { |
| const struct nft_expr_type *type; |
| |
| list_for_each_entry(type, &nf_tables_expressions, list) { |
| if (!nla_strcmp(nla, type->name) && |
| (!type->family || type->family == family)) |
| return type; |
| } |
| return NULL; |
| } |
| |
| static const struct nft_expr_type *nft_expr_type_get(u8 family, |
| struct nlattr *nla) |
| { |
| const struct nft_expr_type *type; |
| |
| if (nla == NULL) |
| return ERR_PTR(-EINVAL); |
| |
| type = __nft_expr_type_get(family, nla); |
| if (type != NULL && try_module_get(type->owner)) |
| return type; |
| |
| #ifdef CONFIG_MODULES |
| if (type == NULL) { |
| nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| request_module("nft-expr-%u-%.*s", family, |
| nla_len(nla), (char *)nla_data(nla)); |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| if (__nft_expr_type_get(family, nla)) |
| return ERR_PTR(-EAGAIN); |
| |
| 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_type_get(family, 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->type->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[NFT_EXPR_MAXATTR + 1]; |
| }; |
| |
| static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
| const struct nlattr *nla, |
| struct nft_expr_info *info) |
| { |
| const struct nft_expr_type *type; |
| const struct nft_expr_ops *ops; |
| struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
| int err; |
| |
| err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
| if (err < 0) |
| return err; |
| |
| type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
| if (IS_ERR(type)) |
| return PTR_ERR(type); |
| |
| if (tb[NFTA_EXPR_DATA]) { |
| err = nla_parse_nested(info->tb, type->maxattr, |
| tb[NFTA_EXPR_DATA], type->policy); |
| if (err < 0) |
| goto err1; |
| } else |
| memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); |
| |
| if (type->select_ops != NULL) { |
| ops = type->select_ops(ctx, |
| (const struct nlattr * const *)info->tb); |
| if (IS_ERR(ops)) { |
| err = PTR_ERR(ops); |
| goto err1; |
| } |
| } else |
| ops = type->ops; |
| |
| info->ops = ops; |
| return 0; |
| |
| err1: |
| module_put(type->owner); |
| return err; |
| } |
| |
| static int nf_tables_newexpr(const struct nft_ctx *ctx, |
| const 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) { |
| err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
| if (err < 0) |
| goto err1; |
| } |
| |
| return 0; |
| |
| err1: |
| expr->ops = NULL; |
| return err; |
| } |
| |
| static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
| struct nft_expr *expr) |
| { |
| if (expr->ops->destroy) |
| expr->ops->destroy(ctx, expr); |
| module_put(expr->ops->type->owner); |
| } |
| |
| /* |
| * Rules |
| */ |
| |
| static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, |
| u64 handle) |
| { |
| struct nft_rule *rule; |
| |
| // FIXME: this sucks |
| list_for_each_entry(rule, &chain->rules, list) { |
| if (handle == rule->handle) |
| return rule; |
| } |
| |
| return ERR_PTR(-ENOENT); |
| } |
| |
| static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, |
| const struct nlattr *nla) |
| { |
| if (nla == NULL) |
| return ERR_PTR(-EINVAL); |
| |
| return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); |
| } |
| |
| static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { |
| [NFTA_RULE_TABLE] = { .type = NLA_STRING }, |
| [NFTA_RULE_CHAIN] = { .type = NLA_STRING, |
| .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, |
| [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, |
| [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
| [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
| [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
| .len = NFT_USERDATA_MAXLEN }, |
| }; |
| |
| static int nf_tables_fill_rule_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, |
| const struct nft_rule *rule) |
| { |
| struct nlmsghdr *nlh; |
| struct nfgenmsg *nfmsg; |
| const struct nft_expr *expr, *next; |
| struct nlattr *list; |
| const struct nft_rule *prule; |
| int type = event | NFNL_SUBSYS_NFTABLES << 8; |
| |
| nlh = nlmsg_put(skb, portid, seq, type, 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_RULE_TABLE, table->name)) |
| goto nla_put_failure; |
| if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) |
| goto nla_put_failure; |
| if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) |
| goto nla_put_failure; |
| |
| if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
| prule = list_entry(rule->list.prev, struct nft_rule, list); |
| if (nla_put_be64(skb, NFTA_RULE_POSITION, |
| cpu_to_be64(prule->handle))) |
| goto nla_put_failure; |
| } |
| |
| list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
| if (list == NULL) |
| goto nla_put_failure; |
| nft_rule_for_each_expr(expr, next, rule) { |
| struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM); |
| if (elem == NULL) |
| goto nla_put_failure; |
| if (nf_tables_fill_expr_info(skb, expr) < 0) |
| goto nla_put_failure; |
| nla_nest_end(skb, elem); |
| } |
| nla_nest_end(skb, list); |
| |
| if (rule->ulen && |
| nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule))) |
| goto nla_put_failure; |
| |
| return nlmsg_end(skb, nlh); |
| |
| nla_put_failure: |
| nlmsg_trim(skb, nlh); |
| return -1; |
| } |
| |
| static int nf_tables_rule_notify(const struct sk_buff *oskb, |
| const struct nlmsghdr *nlh, |
| const struct nft_table *table, |
| const struct nft_chain *chain, |
| const struct nft_rule *rule, |
| int event, u32 flags, int family) |
| { |
| struct sk_buff *skb; |
| u32 portid = NETLINK_CB(oskb).portid; |
| struct net *net = oskb ? sock_net(oskb->sk) : &init_net; |
| u32 seq = nlh->nlmsg_seq; |
| bool report; |
| int err; |
| |
| report = nlmsg_report(nlh); |
| 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_rule_info(skb, portid, seq, event, flags, |
| family, table, chain, rule); |
| 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 inline bool |
| nft_rule_is_active(struct net *net, const struct nft_rule *rule) |
| { |
| return (rule->genmask & (1 << net->nft.gencursor)) == 0; |
| } |
| |
| static inline int gencursor_next(struct net *net) |
| { |
| return net->nft.gencursor+1 == 1 ? 1 : 0; |
| } |
| |
| static inline int |
| nft_rule_is_active_next(struct net *net, const struct nft_rule *rule) |
| { |
| return (rule->genmask & (1 << gencursor_next(net))) == 0; |
| } |
| |
| static inline void |
| nft_rule_activate_next(struct net *net, struct nft_rule *rule) |
| { |
| /* Now inactive, will be active in the future */ |
| rule->genmask = (1 << net->nft.gencursor); |
| } |
| |
| static inline void |
| nft_rule_disactivate_next(struct net *net, struct nft_rule *rule) |
| { |
| rule->genmask = (1 << gencursor_next(net)); |
| } |
| |
| static inline void nft_rule_clear(struct net *net, struct nft_rule *rule) |
| { |
| rule->genmask = 0; |
| } |
| |
| static int nf_tables_dump_rules(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; |
| const struct nft_rule *rule; |
| unsigned int idx = 0, s_idx = cb->args[0]; |
| struct net *net = sock_net(skb->sk); |
| int family = nfmsg->nfgen_family; |
| u8 genctr = ACCESS_ONCE(net->nft.genctr); |
| u8 gencursor = ACCESS_ONCE(net->nft.gencursor); |
| |
| list_for_each_entry(afi, &net->nft.af_info, 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) { |
| list_for_each_entry(rule, &chain->rules, list) { |
| if (!nft_rule_is_active(net, rule)) |
| goto cont; |
| 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_rule_info(skb, NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| NFT_MSG_NEWRULE, |
| NLM_F_MULTI | NLM_F_APPEND, |
| afi->family, table, chain, rule) < 0) |
| goto done; |
| cont: |
| idx++; |
| } |
| } |
| } |
| } |
| done: |
| /* Invalidate this dump, a transition to the new generation happened */ |
| if (gencursor != net->nft.gencursor || genctr != net->nft.genctr) |
| return -EBUSY; |
| |
| cb->args[0] = idx; |
| return skb->len; |
| } |
| |
| static int nf_tables_getrule(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; |
| const struct nft_rule *rule; |
| struct sk_buff *skb2; |
| struct net *net = sock_net(skb->sk); |
| int family = nfmsg->nfgen_family; |
| int err; |
| |
| if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| struct netlink_dump_control c = { |
| .dump = nf_tables_dump_rules, |
| }; |
| return netlink_dump_start(nlsk, skb, nlh, &c); |
| } |
| |
| afi = nf_tables_afinfo_lookup(net, family, false); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
| if (IS_ERR(table)) |
| return PTR_ERR(table); |
| |
| chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| if (IS_ERR(chain)) |
| return PTR_ERR(chain); |
| |
| rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); |
| if (IS_ERR(rule)) |
| return PTR_ERR(rule); |
| |
| skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (!skb2) |
| return -ENOMEM; |
| |
| err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid, |
| nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, |
| family, table, chain, rule); |
| if (err < 0) |
| goto err; |
| |
| return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| |
| err: |
| kfree_skb(skb2); |
| return err; |
| } |
| |
| static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
| struct nft_rule *rule) |
| { |
| struct nft_expr *expr; |
| |
| /* |
| * Careful: some expressions might not be initialized in case this |
| * is called on error from nf_tables_newrule(). |
| */ |
| expr = nft_expr_first(rule); |
| while (expr->ops && expr != nft_expr_last(rule)) { |
| nf_tables_expr_destroy(ctx, expr); |
| expr = nft_expr_next(expr); |
| } |
| kfree(rule); |
| } |
| |
| #define NFT_RULE_MAXEXPRS 128 |
| |
| static struct nft_expr_info *info; |
| |
| static struct nft_rule_trans * |
| nf_tables_trans_add(struct nft_ctx *ctx, struct nft_rule *rule) |
| { |
| struct nft_rule_trans *rupd; |
| |
| rupd = kmalloc(sizeof(struct nft_rule_trans), GFP_KERNEL); |
| if (rupd == NULL) |
| return NULL; |
| |
| rupd->ctx = *ctx; |
| rupd->rule = rule; |
| list_add_tail(&rupd->list, &ctx->net->nft.commit_list); |
| |
| return rupd; |
| } |
| |
| static int nf_tables_newrule(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 net *net = sock_net(skb->sk); |
| struct nft_table *table; |
| struct nft_chain *chain; |
| struct nft_rule *rule, *old_rule = NULL; |
| struct nft_rule_trans *repl = NULL; |
| struct nft_expr *expr; |
| struct nft_ctx ctx; |
| struct nlattr *tmp; |
| unsigned int size, i, n, ulen = 0; |
| int err, rem; |
| bool create; |
| u64 handle, pos_handle; |
| |
| create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| |
| afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
| if (IS_ERR(table)) |
| return PTR_ERR(table); |
| |
| chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| if (IS_ERR(chain)) |
| return PTR_ERR(chain); |
| |
| if (nla[NFTA_RULE_HANDLE]) { |
| handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); |
| rule = __nf_tables_rule_lookup(chain, handle); |
| if (IS_ERR(rule)) |
| return PTR_ERR(rule); |
| |
| if (nlh->nlmsg_flags & NLM_F_EXCL) |
| return -EEXIST; |
| if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| old_rule = rule; |
| else |
| return -EOPNOTSUPP; |
| } else { |
| if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) |
| return -EINVAL; |
| handle = nf_tables_alloc_handle(table); |
| } |
| |
| if (nla[NFTA_RULE_POSITION]) { |
| if (!(nlh->nlmsg_flags & NLM_F_CREATE)) |
| return -EOPNOTSUPP; |
| |
| pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); |
| old_rule = __nf_tables_rule_lookup(chain, pos_handle); |
| if (IS_ERR(old_rule)) |
| return PTR_ERR(old_rule); |
| } |
| |
| nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| |
| n = 0; |
| size = 0; |
| if (nla[NFTA_RULE_EXPRESSIONS]) { |
| nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { |
| err = -EINVAL; |
| if (nla_type(tmp) != NFTA_LIST_ELEM) |
| goto err1; |
| if (n == NFT_RULE_MAXEXPRS) |
| goto err1; |
| err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
| if (err < 0) |
| goto err1; |
| size += info[n].ops->size; |
| n++; |
| } |
| } |
| |
| if (nla[NFTA_RULE_USERDATA]) |
| ulen = nla_len(nla[NFTA_RULE_USERDATA]); |
| |
| err = -ENOMEM; |
| rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL); |
| if (rule == NULL) |
| goto err1; |
| |
| nft_rule_activate_next(net, rule); |
| |
| rule->handle = handle; |
| rule->dlen = size; |
| rule->ulen = ulen; |
| |
| if (ulen) |
| nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen); |
| |
| expr = nft_expr_first(rule); |
| for (i = 0; i < n; i++) { |
| err = nf_tables_newexpr(&ctx, &info[i], expr); |
| if (err < 0) |
| goto err2; |
| info[i].ops = NULL; |
| expr = nft_expr_next(expr); |
| } |
| |
| if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
| if (nft_rule_is_active_next(net, old_rule)) { |
| repl = nf_tables_trans_add(&ctx, old_rule); |
| if (repl == NULL) { |
| err = -ENOMEM; |
| goto err2; |
| } |
| nft_rule_disactivate_next(net, old_rule); |
| list_add_tail(&rule->list, &old_rule->list); |
| } else { |
| err = -ENOENT; |
| goto err2; |
| } |
| } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
| if (old_rule) |
| list_add_rcu(&rule->list, &old_rule->list); |
| else |
| list_add_tail_rcu(&rule->list, &chain->rules); |
| else { |
| if (old_rule) |
| list_add_tail_rcu(&rule->list, &old_rule->list); |
| else |
| list_add_rcu(&rule->list, &chain->rules); |
| } |
| |
| if (nf_tables_trans_add(&ctx, rule) == NULL) { |
| err = -ENOMEM; |
| goto err3; |
| } |
| return 0; |
| |
| err3: |
| list_del_rcu(&rule->list); |
| if (repl) { |
| list_del_rcu(&repl->rule->list); |
| list_del(&repl->list); |
| nft_rule_clear(net, repl->rule); |
| kfree(repl); |
| } |
| err2: |
| nf_tables_rule_destroy(&ctx, rule); |
| err1: |
| for (i = 0; i < n; i++) { |
| if (info[i].ops != NULL) |
| module_put(info[i].ops->type->owner); |
| } |
| return err; |
| } |
| |
| static int |
| nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule) |
| { |
| /* You cannot delete the same rule twice */ |
| if (nft_rule_is_active_next(ctx->net, rule)) { |
| if (nf_tables_trans_add(ctx, rule) == NULL) |
| return -ENOMEM; |
| nft_rule_disactivate_next(ctx->net, rule); |
| return 0; |
| } |
| return -ENOENT; |
| } |
| |
| static int nf_table_delrule_by_chain(struct nft_ctx *ctx) |
| { |
| struct nft_rule *rule; |
| int err; |
| |
| list_for_each_entry(rule, &ctx->chain->rules, list) { |
| err = nf_tables_delrule_one(ctx, rule); |
| if (err < 0) |
| return err; |
| } |
| return 0; |
| } |
| |
| static int nf_tables_delrule(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 net *net = sock_net(skb->sk); |
| const struct nft_table *table; |
| struct nft_chain *chain = NULL; |
| struct nft_rule *rule; |
| int family = nfmsg->nfgen_family, err = 0; |
| struct nft_ctx ctx; |
| |
| afi = nf_tables_afinfo_lookup(net, family, false); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
| if (IS_ERR(table)) |
| return PTR_ERR(table); |
| |
| if (nla[NFTA_RULE_CHAIN]) { |
| chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); |
| if (IS_ERR(chain)) |
| return PTR_ERR(chain); |
| } |
| |
| nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
| |
| if (chain) { |
| if (nla[NFTA_RULE_HANDLE]) { |
| rule = nf_tables_rule_lookup(chain, |
| nla[NFTA_RULE_HANDLE]); |
| if (IS_ERR(rule)) |
| return PTR_ERR(rule); |
| |
| err = nf_tables_delrule_one(&ctx, rule); |
| } else { |
| err = nf_table_delrule_by_chain(&ctx); |
| } |
| } else { |
| list_for_each_entry(chain, &table->chains, list) { |
| ctx.chain = chain; |
| err = nf_table_delrule_by_chain(&ctx); |
| if (err < 0) |
| break; |
| } |
| } |
| |
| return err; |
| } |
| |
| static int nf_tables_commit(struct sk_buff *skb) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct nft_rule_trans *rupd, *tmp; |
| |
| /* Bump generation counter, invalidate any dump in progress */ |
| net->nft.genctr++; |
| |
| /* A new generation has just started */ |
| net->nft.gencursor = gencursor_next(net); |
| |
| /* Make sure all packets have left the previous generation before |
| * purging old rules. |
| */ |
| synchronize_rcu(); |
| |
| list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { |
| /* This rule was inactive in the past and just became active. |
| * Clear the next bit of the genmask since its meaning has |
| * changed, now it is the future. |
| */ |
| if (nft_rule_is_active(net, rupd->rule)) { |
| nft_rule_clear(net, rupd->rule); |
| nf_tables_rule_notify(skb, rupd->ctx.nlh, |
| rupd->ctx.table, rupd->ctx.chain, |
| rupd->rule, NFT_MSG_NEWRULE, 0, |
| rupd->ctx.afi->family); |
| list_del(&rupd->list); |
| kfree(rupd); |
| continue; |
| } |
| |
| /* This rule is in the past, get rid of it */ |
| list_del_rcu(&rupd->rule->list); |
| nf_tables_rule_notify(skb, rupd->ctx.nlh, |
| rupd->ctx.table, rupd->ctx.chain, |
| rupd->rule, NFT_MSG_DELRULE, 0, |
| rupd->ctx.afi->family); |
| } |
| |
| /* Make sure we don't see any packet traversing old rules */ |
| synchronize_rcu(); |
| |
| /* Now we can safely release unused old rules */ |
| list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { |
| nf_tables_rule_destroy(&rupd->ctx, rupd->rule); |
| list_del(&rupd->list); |
| kfree(rupd); |
| } |
| |
| return 0; |
| } |
| |
| static int nf_tables_abort(struct sk_buff *skb) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct nft_rule_trans *rupd, *tmp; |
| |
| list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { |
| if (!nft_rule_is_active_next(net, rupd->rule)) { |
| nft_rule_clear(net, rupd->rule); |
| list_del(&rupd->list); |
| kfree(rupd); |
| continue; |
| } |
| |
| /* This rule is inactive, get rid of it */ |
| list_del_rcu(&rupd->rule->list); |
| } |
| |
| /* Make sure we don't see any packet accessing aborted rules */ |
| synchronize_rcu(); |
| |
| list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { |
| nf_tables_rule_destroy(&rupd->ctx, rupd->rule); |
| list_del(&rupd->list); |
| kfree(rupd); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Sets |
| */ |
| |
| static LIST_HEAD(nf_tables_set_ops); |
| |
| int nft_register_set(struct nft_set_ops *ops) |
| { |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| list_add_tail(&ops->list, &nf_tables_set_ops); |
| nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nft_register_set); |
| |
| void nft_unregister_set(struct nft_set_ops *ops) |
| { |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| list_del(&ops->list); |
| nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| } |
| EXPORT_SYMBOL_GPL(nft_unregister_set); |
| |
| static const struct nft_set_ops *nft_select_set_ops(const struct nlattr * const nla[]) |
| { |
| const struct nft_set_ops *ops; |
| u32 features; |
| |
| #ifdef CONFIG_MODULES |
| if (list_empty(&nf_tables_set_ops)) { |
| nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
| request_module("nft-set"); |
| nfnl_lock(NFNL_SUBSYS_NFTABLES); |
| if (!list_empty(&nf_tables_set_ops)) |
| return ERR_PTR(-EAGAIN); |
| } |
| #endif |
| features = 0; |
| if (nla[NFTA_SET_FLAGS] != NULL) { |
| features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); |
| features &= NFT_SET_INTERVAL | NFT_SET_MAP; |
| } |
| |
| // FIXME: implement selection properly |
| list_for_each_entry(ops, &nf_tables_set_ops, list) { |
| if ((ops->features & features) != features) |
| continue; |
| if (!try_module_get(ops->owner)) |
| continue; |
| return ops; |
| } |
| |
| return ERR_PTR(-EOPNOTSUPP); |
| } |
| |
| static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { |
| [NFTA_SET_TABLE] = { .type = NLA_STRING }, |
| [NFTA_SET_NAME] = { .type = NLA_STRING, |
| .len = IFNAMSIZ - 1 }, |
| [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
| [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, |
| [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, |
| [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, |
| [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, |
| }; |
| |
| static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, |
| const struct sk_buff *skb, |
| const struct nlmsghdr *nlh, |
| const struct nlattr * const nla[]) |
| { |
| struct net *net = sock_net(skb->sk); |
| const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| const struct nft_af_info *afi = NULL; |
| const struct nft_table *table = NULL; |
| |
| if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
| afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| } |
| |
| if (nla[NFTA_SET_TABLE] != NULL) { |
| if (afi == NULL) |
| return -EAFNOSUPPORT; |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
| if (IS_ERR(table)) |
| return PTR_ERR(table); |
| } |
| |
| nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
| return 0; |
| } |
| |
| struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
| const struct nlattr *nla) |
| { |
| struct nft_set *set; |
| |
| if (nla == NULL) |
| return ERR_PTR(-EINVAL); |
| |
| list_for_each_entry(set, &table->sets, list) { |
| if (!nla_strcmp(nla, set->name)) |
| return set; |
| } |
| return ERR_PTR(-ENOENT); |
| } |
| |
| static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
| const char *name) |
| { |
| const struct nft_set *i; |
| const char *p; |
| unsigned long *inuse; |
| unsigned int n = 0; |
| |
| p = strnchr(name, IFNAMSIZ, '%'); |
| if (p != NULL) { |
| if (p[1] != 'd' || strchr(p + 2, '%')) |
| return -EINVAL; |
| |
| inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); |
| if (inuse == NULL) |
| return -ENOMEM; |
| |
| list_for_each_entry(i, &ctx->table->sets, list) { |
| int tmp; |
| |
| if (!sscanf(i->name, name, &tmp)) |
| continue; |
| if (tmp < 0 || tmp >= BITS_PER_BYTE * PAGE_SIZE) |
| continue; |
| |
| set_bit(tmp, inuse); |
| } |
| |
| n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
| free_page((unsigned long)inuse); |
| } |
| |
| snprintf(set->name, sizeof(set->name), name, n); |
| list_for_each_entry(i, &ctx->table->sets, list) { |
| if (!strcmp(set->name, i->name)) |
| return -ENFILE; |
| } |
| return 0; |
| } |
| |
| static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, |
| const struct nft_set *set, u16 event, u16 flags) |
| { |
| struct nfgenmsg *nfmsg; |
| struct nlmsghdr *nlh; |
| u32 portid = NETLINK_CB(ctx->skb).portid; |
| u32 seq = ctx->nlh->nlmsg_seq; |
| |
| 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 = ctx->afi->family; |
| nfmsg->version = NFNETLINK_V0; |
| nfmsg->res_id = 0; |
| |
| if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) |
| goto nla_put_failure; |
| if (nla_put_string(skb, NFTA_SET_NAME, set->name)) |
| goto nla_put_failure; |
| if (set->flags != 0) |
| if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) |
| goto nla_put_failure; |
| |
| if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) |
| goto nla_put_failure; |
| if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) |
| goto nla_put_failure; |
| if (set->flags & NFT_SET_MAP) { |
| if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) |
| goto nla_put_failure; |
| if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) |
| goto nla_put_failure; |
| } |
| |
| return nlmsg_end(skb, nlh); |
| |
| nla_put_failure: |
| nlmsg_trim(skb, nlh); |
| return -1; |
| } |
| |
| static int nf_tables_set_notify(const struct nft_ctx *ctx, |
| const struct nft_set *set, |
| int event) |
| { |
| struct sk_buff *skb; |
| u32 portid = NETLINK_CB(ctx->skb).portid; |
| bool report; |
| int err; |
| |
| report = nlmsg_report(ctx->nlh); |
| if (!report && !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) |
| return 0; |
| |
| err = -ENOBUFS; |
| skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (skb == NULL) |
| goto err; |
| |
| err = nf_tables_fill_set(skb, ctx, set, event, 0); |
| if (err < 0) { |
| kfree_skb(skb); |
| goto err; |
| } |
| |
| err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, report, |
| GFP_KERNEL); |
| err: |
| if (err < 0) |
| nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
| return err; |
| } |
| |
| static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb, |
| struct netlink_callback *cb) |
| { |
| const struct nft_set *set; |
| unsigned int idx = 0, s_idx = cb->args[0]; |
| |
| if (cb->args[1]) |
| return skb->len; |
| |
| list_for_each_entry(set, &ctx->table->sets, list) { |
| if (idx < s_idx) |
| goto cont; |
| if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, |
| NLM_F_MULTI) < 0) { |
| cb->args[0] = idx; |
| goto done; |
| } |
| cont: |
| idx++; |
| } |
| cb->args[1] = 1; |
| done: |
| return skb->len; |
| } |
| |
| static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb, |
| struct netlink_callback *cb) |
| { |
| const struct nft_set *set; |
| unsigned int idx, s_idx = cb->args[0]; |
| struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
| |
| if (cb->args[1]) |
| return skb->len; |
| |
| list_for_each_entry(table, &ctx->afi->tables, list) { |
| if (cur_table) { |
| if (cur_table != table) |
| continue; |
| |
| cur_table = NULL; |
| } |
| ctx->table = table; |
| idx = 0; |
| list_for_each_entry(set, &ctx->table->sets, list) { |
| if (idx < s_idx) |
| goto cont; |
| if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, |
| NLM_F_MULTI) < 0) { |
| cb->args[0] = idx; |
| cb->args[2] = (unsigned long) table; |
| goto done; |
| } |
| cont: |
| idx++; |
| } |
| } |
| cb->args[1] = 1; |
| done: |
| return skb->len; |
| } |
| |
| static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb, |
| struct netlink_callback *cb) |
| { |
| const struct nft_set *set; |
| unsigned int idx, s_idx = cb->args[0]; |
| const struct nft_af_info *afi; |
| struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
| struct net *net = sock_net(skb->sk); |
| int cur_family = cb->args[3]; |
| |
| if (cb->args[1]) |
| return skb->len; |
| |
| list_for_each_entry(afi, &net->nft.af_info, list) { |
| if (cur_family) { |
| if (afi->family != cur_family) |
| continue; |
| |
| cur_family = 0; |
| } |
| |
| list_for_each_entry(table, &afi->tables, list) { |
| if (cur_table) { |
| if (cur_table != table) |
| continue; |
| |
| cur_table = NULL; |
| } |
| |
| ctx->table = table; |
| ctx->afi = afi; |
| idx = 0; |
| list_for_each_entry(set, &ctx->table->sets, list) { |
| if (idx < s_idx) |
| goto cont; |
| if (nf_tables_fill_set(skb, ctx, set, |
| NFT_MSG_NEWSET, |
| NLM_F_MULTI) < 0) { |
| cb->args[0] = idx; |
| cb->args[2] = (unsigned long) table; |
| cb->args[3] = afi->family; |
| goto done; |
| } |
| cont: |
| idx++; |
| } |
| if (s_idx) |
| s_idx = 0; |
| } |
| } |
| cb->args[1] = 1; |
| done: |
| return skb->len; |
| } |
| |
| static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| struct nlattr *nla[NFTA_SET_MAX + 1]; |
| struct nft_ctx ctx; |
| int err, ret; |
| |
| err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX, |
| nft_set_policy); |
| if (err < 0) |
| return err; |
| |
| err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla); |
| if (err < 0) |
| return err; |
| |
| if (ctx.table == NULL) { |
| if (ctx.afi == NULL) |
| ret = nf_tables_dump_sets_all(&ctx, skb, cb); |
| else |
| ret = nf_tables_dump_sets_family(&ctx, skb, cb); |
| } else |
| ret = nf_tables_dump_sets_table(&ctx, skb, cb); |
| |
| return ret; |
| } |
| |
| static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, |
| const struct nlmsghdr *nlh, |
| const struct nlattr * const nla[]) |
| { |
| const struct nft_set *set; |
| struct nft_ctx ctx; |
| struct sk_buff *skb2; |
| const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
| int err; |
| |
| /* Verify existance before starting dump */ |
| err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); |
| if (err < 0) |
| return err; |
| |
| if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| struct netlink_dump_control c = { |
| .dump = nf_tables_dump_sets, |
| }; |
| return netlink_dump_start(nlsk, skb, nlh, &c); |
| } |
| |
| /* Only accept unspec with dump */ |
| if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
| return -EAFNOSUPPORT; |
| |
| set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
| if (IS_ERR(set)) |
| return PTR_ERR(set); |
| |
| skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (skb2 == NULL) |
| return -ENOMEM; |
| |
| err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); |
| if (err < 0) |
| goto err; |
| |
| return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); |
| |
| err: |
| kfree_skb(skb2); |
| return err; |
| } |
| |
| static int nf_tables_newset(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_set_ops *ops; |
| const struct nft_af_info *afi; |
| struct net *net = sock_net(skb->sk); |
| struct nft_table *table; |
| struct nft_set *set; |
| struct nft_ctx ctx; |
| char name[IFNAMSIZ]; |
| unsigned int size; |
| bool create; |
| u32 ktype, klen, dlen, dtype, flags; |
| int err; |
| |
| if (nla[NFTA_SET_TABLE] == NULL || |
| nla[NFTA_SET_NAME] == NULL || |
| nla[NFTA_SET_KEY_LEN] == NULL) |
| return -EINVAL; |
| |
| ktype = NFT_DATA_VALUE; |
| if (nla[NFTA_SET_KEY_TYPE] != NULL) { |
| ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); |
| if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) |
| return -EINVAL; |
| } |
| |
| klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
| if (klen == 0 || klen > FIELD_SIZEOF(struct nft_data, data)) |
| return -EINVAL; |
| |
| flags = 0; |
| if (nla[NFTA_SET_FLAGS] != NULL) { |
| flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); |
| if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | |
| NFT_SET_INTERVAL | NFT_SET_MAP)) |
| return -EINVAL; |
| } |
| |
| dtype = 0; |
| dlen = 0; |
| if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
| if (!(flags & NFT_SET_MAP)) |
| return -EINVAL; |
| |
| dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); |
| if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && |
| dtype != NFT_DATA_VERDICT) |
| return -EINVAL; |
| |
| if (dtype != NFT_DATA_VERDICT) { |
| if (nla[NFTA_SET_DATA_LEN] == NULL) |
| return -EINVAL; |
| dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
| if (dlen == 0 || |
| dlen > FIELD_SIZEOF(struct nft_data, data)) |
| return -EINVAL; |
| } else |
| dlen = sizeof(struct nft_data); |
| } else if (flags & NFT_SET_MAP) |
| return -EINVAL; |
| |
| create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
| |
| afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
| if (IS_ERR(table)) |
| return PTR_ERR(table); |
| |
| nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
| |
| set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); |
| if (IS_ERR(set)) { |
| if (PTR_ERR(set) != -ENOENT) |
| return PTR_ERR(set); |
| set = NULL; |
| } |
| |
| if (set != NULL) { |
| if (nlh->nlmsg_flags & NLM_F_EXCL) |
| return -EEXIST; |
| if (nlh->nlmsg_flags & NLM_F_REPLACE) |
| return -EOPNOTSUPP; |
| return 0; |
| } |
| |
| if (!(nlh->nlmsg_flags & NLM_F_CREATE)) |
| return -ENOENT; |
| |
| ops = nft_select_set_ops(nla); |
| if (IS_ERR(ops)) |
| return PTR_ERR(ops); |
| |
| size = 0; |
| if (ops->privsize != NULL) |
| size = ops->privsize(nla); |
| |
| err = -ENOMEM; |
| set = kzalloc(sizeof(*set) + size, GFP_KERNEL); |
| if (set == NULL) |
| goto err1; |
| |
| nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); |
| err = nf_tables_set_alloc_name(&ctx, set, name); |
| if (err < 0) |
| goto err2; |
| |
| INIT_LIST_HEAD(&set->bindings); |
| set->ops = ops; |
| set->ktype = ktype; |
| set->klen = klen; |
| set->dtype = dtype; |
| set->dlen = dlen; |
| set->flags = flags; |
| |
| err = ops->init(set, nla); |
| if (err < 0) |
| goto err2; |
| |
| list_add_tail(&set->list, &table->sets); |
| nf_tables_set_notify(&ctx, set, NFT_MSG_NEWSET); |
| return 0; |
| |
| err2: |
| kfree(set); |
| err1: |
| module_put(ops->owner); |
| return err; |
| } |
| |
| static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
| { |
| list_del(&set->list); |
| nf_tables_set_notify(ctx, set, NFT_MSG_DELSET); |
| |
| set->ops->destroy(set); |
| module_put(set->ops->owner); |
| kfree(set); |
| } |
| |
| static int nf_tables_delset(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_set *set; |
| struct nft_ctx ctx; |
| int err; |
| |
| if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
| return -EAFNOSUPPORT; |
| if (nla[NFTA_SET_TABLE] == NULL) |
| return -EINVAL; |
| |
| err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); |
| if (err < 0) |
| return err; |
| |
| set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
| if (IS_ERR(set)) |
| return PTR_ERR(set); |
| if (!list_empty(&set->bindings)) |
| return -EBUSY; |
| |
| nf_tables_set_destroy(&ctx, set); |
| return 0; |
| } |
| |
| static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, |
| const struct nft_set *set, |
| const struct nft_set_iter *iter, |
| const struct nft_set_elem *elem) |
| { |
| enum nft_registers dreg; |
| |
| dreg = nft_type_to_reg(set->dtype); |
| return nft_validate_data_load(ctx, dreg, &elem->data, |
| set->dtype == NFT_DATA_VERDICT ? |
| NFT_DATA_VERDICT : NFT_DATA_VALUE); |
| } |
| |
| int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, |
| struct nft_set_binding *binding) |
| { |
| struct nft_set_binding *i; |
| struct nft_set_iter iter; |
| |
| if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) |
| return -EBUSY; |
| |
| if (set->flags & NFT_SET_MAP) { |
| /* If the set is already bound to the same chain all |
| * jumps are already validated for that chain. |
| */ |
| list_for_each_entry(i, &set->bindings, list) { |
| if (i->chain == binding->chain) |
| goto bind; |
| } |
| |
| iter.skip = 0; |
| iter.count = 0; |
| iter.err = 0; |
| iter.fn = nf_tables_bind_check_setelem; |
| |
| set->ops->walk(ctx, set, &iter); |
| if (iter.err < 0) { |
| /* Destroy anonymous sets if binding fails */ |
| if (set->flags & NFT_SET_ANONYMOUS) |
| nf_tables_set_destroy(ctx, set); |
| |
| return iter.err; |
| } |
| } |
| bind: |
| binding->chain = ctx->chain; |
| list_add_tail(&binding->list, &set->bindings); |
| return 0; |
| } |
| |
| void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, |
| struct nft_set_binding *binding) |
| { |
| list_del(&binding->list); |
| |
| if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) |
| nf_tables_set_destroy(ctx, set); |
| } |
| |
| /* |
| * Set elements |
| */ |
| |
| static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { |
| [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, |
| [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, |
| [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, |
| }; |
| |
| static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { |
| [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, |
| [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, |
| [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, |
| }; |
| |
| static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, |
| const 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 net *net = sock_net(skb->sk); |
| |
| afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
| if (IS_ERR(afi)) |
| return PTR_ERR(afi); |
| |
| table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
| if (IS_ERR(table)) |
| return PTR_ERR(table); |
| |
| nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
| return 0; |
| } |
| |
| static int nf_tables_fill_setelem(struct sk_buff *skb, |
| const struct nft_set *set, |
| const struct nft_set_elem *elem) |
| { |
| unsigned char *b = skb_tail_pointer(skb); |
| struct nlattr *nest; |
| |
| nest = nla_nest_start(skb, NFTA_LIST_ELEM); |
| if (nest == NULL) |
| goto nla_put_failure; |
| |
| if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE, |
| set->klen) < 0) |
| goto nla_put_failure; |
| |
| if (set->flags & NFT_SET_MAP && |
| !(elem->flags & NFT_SET_ELEM_INTERVAL_END) && |
| nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data, |
| set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, |
| set->dlen) < 0) |
| goto nla_put_failure; |
| |
| if (elem->flags != 0) |
| if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags))) |
| goto nla_put_failure; |
| |
| nla_nest_end(skb, nest); |
| return 0; |
| |
| nla_put_failure: |
| nlmsg_trim(skb, b); |
| return -EMSGSIZE; |
| } |
| |
| struct nft_set_dump_args { |
| const struct netlink_callback *cb; |
| struct nft_set_iter iter; |
| struct sk_buff *skb; |
| }; |
| |
| static int nf_tables_dump_setelem(const struct nft_ctx *ctx, |
| const struct nft_set *set, |
| const struct nft_set_iter *iter, |
| const struct nft_set_elem *elem) |
| { |
| struct nft_set_dump_args *args; |
| |
| args = container_of(iter, struct nft_set_dump_args, iter); |
| return nf_tables_fill_setelem(args->skb, set, elem); |
| } |
| |
| static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| const struct nft_set *set; |
| struct nft_set_dump_args args; |
| struct nft_ctx ctx; |
| struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; |
| struct nfgenmsg *nfmsg; |
| struct nlmsghdr *nlh; |
| struct nlattr *nest; |
| u32 portid, seq; |
| int event, err; |
| |
| err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
| NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); |
| if (err < 0) |
| return err; |
| |
| err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla); |
| if (err < 0) |
| return err; |
| |
| set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| if (IS_ERR(set)) |
| return PTR_ERR(set); |
| |
| event = NFT_MSG_NEWSETELEM; |
| event |= NFNL_SUBSYS_NFTABLES << 8; |
| portid = NETLINK_CB(cb->skb).portid; |
| seq = cb->nlh->nlmsg_seq; |
| |
| nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), |
| NLM_F_MULTI); |
| if (nlh == NULL) |
| goto nla_put_failure; |
| |
| nfmsg = nlmsg_data(nlh); |
| nfmsg->nfgen_family = NFPROTO_UNSPEC; |
| nfmsg->version = NFNETLINK_V0; |
| nfmsg->res_id = 0; |
| |
| if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) |
| goto nla_put_failure; |
| if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) |
| goto nla_put_failure; |
| |
| nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); |
| if (nest == NULL) |
| goto nla_put_failure; |
| |
| args.cb = cb; |
| args.skb = skb; |
| args.iter.skip = cb->args[0]; |
| args.iter.count = 0; |
| args.iter.err = 0; |
| args.iter.fn = nf_tables_dump_setelem; |
| set->ops->walk(&ctx, set, &args.iter); |
| |
| nla_nest_end(skb, nest); |
| nlmsg_end(skb, nlh); |
| |
| if (args.iter.err && args.iter.err != -EMSGSIZE) |
| return args.iter.err; |
| if (args.iter.count == cb->args[0]) |
| return 0; |
| |
| cb->args[0] = args.iter.count; |
| return skb->len; |
| |
| nla_put_failure: |
| return -ENOSPC; |
| } |
| |
| static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, |
| const struct nlmsghdr *nlh, |
| const struct nlattr * const nla[]) |
| { |
| const struct nft_set *set; |
| struct nft_ctx ctx; |
| int err; |
| |
| err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); |
| if (err < 0) |
| return err; |
| |
| set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| if (IS_ERR(set)) |
| return PTR_ERR(set); |
| |
| if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| struct netlink_dump_control c = { |
| .dump = nf_tables_dump_set, |
| }; |
| return netlink_dump_start(nlsk, skb, nlh, &c); |
| } |
| return -EOPNOTSUPP; |
| } |
| |
| static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set, |
| const struct nlattr *attr) |
| { |
| struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; |
| struct nft_data_desc d1, d2; |
| struct nft_set_elem elem; |
| struct nft_set_binding *binding; |
| enum nft_registers dreg; |
| int err; |
| |
| err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
| nft_set_elem_policy); |
| if (err < 0) |
| return err; |
| |
| if (nla[NFTA_SET_ELEM_KEY] == NULL) |
| return -EINVAL; |
| |
| elem.flags = 0; |
| if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { |
| elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); |
| if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END) |
| return -EINVAL; |
| } |
| |
| if (set->flags & NFT_SET_MAP) { |
| if (nla[NFTA_SET_ELEM_DATA] == NULL && |
| !(elem.flags & NFT_SET_ELEM_INTERVAL_END)) |
| return -EINVAL; |
| if (nla[NFTA_SET_ELEM_DATA] != NULL && |
| elem.flags & NFT_SET_ELEM_INTERVAL_END) |
| return -EINVAL; |
| } else { |
| if (nla[NFTA_SET_ELEM_DATA] != NULL) |
| return -EINVAL; |
| } |
| |
| err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]); |
| if (err < 0) |
| goto err1; |
| err = -EINVAL; |
| if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) |
| goto err2; |
| |
| err = -EEXIST; |
| if (set->ops->get(set, &elem) == 0) |
| goto err2; |
| |
| if (nla[NFTA_SET_ELEM_DATA] != NULL) { |
| err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]); |
| if (err < 0) |
| goto err2; |
| |
| err = -EINVAL; |
| if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) |
| goto err3; |
| |
| dreg = nft_type_to_reg(set->dtype); |
| list_for_each_entry(binding, &set->bindings, list) { |
| struct nft_ctx bind_ctx = { |
| .afi = ctx->afi, |
| .table = ctx->table, |
| .chain = binding->chain, |
| }; |
| |
| err = nft_validate_data_load(&bind_ctx, dreg, |
| &elem.data, d2.type); |
| if (err < 0) |
| goto err3; |
| } |
| } |
| |
| err = set->ops->insert(set, &elem); |
| if (err < 0) |
| goto err3; |
| |
| return 0; |
| |
| err3: |
| if (nla[NFTA_SET_ELEM_DATA] != NULL) |
| nft_data_uninit(&elem.data, d2.type); |
| err2: |
| nft_data_uninit(&elem.key, d1.type); |
| err1: |
| return err; |
| } |
| |
| static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb, |
| const struct nlmsghdr *nlh, |
| const struct nlattr * const nla[]) |
| { |
| const struct nlattr *attr; |
| struct nft_set *set; |
| struct nft_ctx ctx; |
| int rem, err; |
| |
| err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); |
| if (err < 0) |
| return err; |
| |
| set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| if (IS_ERR(set)) |
| return PTR_ERR(set); |
| if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
| return -EBUSY; |
| |
| nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
| err = nft_add_set_elem(&ctx, set, attr); |
| if (err < 0) |
| return err; |
| } |
| return 0; |
| } |
| |
| static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set, |
| const struct nlattr *attr) |
| { |
| struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; |
| struct nft_data_desc desc; |
| struct nft_set_elem elem; |
| int err; |
| |
| err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
| nft_set_elem_policy); |
| if (err < 0) |
| goto err1; |
| |
| err = -EINVAL; |
| if (nla[NFTA_SET_ELEM_KEY] == NULL) |
| goto err1; |
| |
| err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]); |
| if (err < 0) |
| goto err1; |
| |
| err = -EINVAL; |
| if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) |
| goto err2; |
| |
| err = set->ops->get(set, &elem); |
| if (err < 0) |
| goto err2; |
| |
| set->ops->remove(set, &elem); |
| |
| nft_data_uninit(&elem.key, NFT_DATA_VALUE); |
| if (set->flags & NFT_SET_MAP) |
| nft_data_uninit(&elem.data, set->dtype); |
| |
| err2: |
| nft_data_uninit(&elem.key, desc.type); |
| err1: |
| return err; |
| } |
| |
| static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, |
| const struct nlmsghdr *nlh, |
| const struct nlattr * const nla[]) |
| { |
| const struct nlattr *attr; |
| struct nft_set *set; |
| struct nft_ctx ctx; |
| int rem, err; |
| |
| err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla); |
| if (err < 0) |
| return err; |
| |
| set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); |
| if (IS_ERR(set)) |
| return PTR_ERR(set); |
| if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
| return -EBUSY; |
| |
| nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { |
| err = nft_del_setelem(&ctx, set, attr); |
| if (err < 0) |
| return err; |
| } |
| return 0; |
| } |
| |
| static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
| [NFT_MSG_NEWTABLE] = { |
| .call = nf_tables_newtable, |
| .attr_count = NFTA_TABLE_MAX, |
| .policy = nft_table_policy, |
| }, |
| [NFT_MSG_GETTABLE] = { |
| .call = nf_tables_gettable, |
| .attr_count = NFTA_TABLE_MAX, |
| .policy = nft_table_policy, |
| }, |
| [NFT_MSG_DELTABLE] = { |
| .call = nf_tables_deltable, |
| .attr_count = NFTA_TABLE_MAX, |
| .policy = nft_table_policy, |
| }, |
| [NFT_MSG_NEWCHAIN] = { |
| .call = nf_tables_newchain, |
| .attr_count = NFTA_CHAIN_MAX, |
| .policy = nft_chain_policy, |
| }, |
| [NFT_MSG_GETCHAIN] = { |
| .call = nf_tables_getchain, |
| .attr_count = NFTA_CHAIN_MAX, |
| .policy = nft_chain_policy, |
| }, |
| [NFT_MSG_DELCHAIN] = { |
| .call = nf_tables_delchain, |
| .attr_count = NFTA_CHAIN_MAX, |
| .policy = nft_chain_policy, |
| }, |
| [NFT_MSG_NEWRULE] = { |
| .call_batch = nf_tables_newrule, |
| .attr_count = NFTA_RULE_MAX, |
| .policy = nft_rule_policy, |
| }, |
| [NFT_MSG_GETRULE] = { |
| .call = nf_tables_getrule, |
| .attr_count = NFTA_RULE_MAX, |
| .policy = nft_rule_policy, |
| }, |
| [NFT_MSG_DELRULE] = { |
| .call_batch = nf_tables_delrule, |
| .attr_count = NFTA_RULE_MAX, |
| .policy = nft_rule_policy, |
| }, |
| [NFT_MSG_NEWSET] = { |
| .call = nf_tables_newset, |
| .attr_count = NFTA_SET_MAX, |
| .policy = nft_set_policy, |
| }, |
| [NFT_MSG_GETSET] = { |
| .call = nf_tables_getset, |
| .attr_count = NFTA_SET_MAX, |
| .policy = nft_set_policy, |
| }, |
| [NFT_MSG_DELSET] = { |
| .call = nf_tables_delset, |
| .attr_count = NFTA_SET_MAX, |
| .policy = nft_set_policy, |
| }, |
| [NFT_MSG_NEWSETELEM] = { |
| .call = nf_tables_newsetelem, |
| .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| .policy = nft_set_elem_list_policy, |
| }, |
| [NFT_MSG_GETSETELEM] = { |
| .call = nf_tables_getsetelem, |
| .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| .policy = nft_set_elem_list_policy, |
| }, |
| [NFT_MSG_DELSETELEM] = { |
| .call = nf_tables_delsetelem, |
| .attr_count = NFTA_SET_ELEM_LIST_MAX, |
| .policy = nft_set_elem_list_policy, |
| }, |
| }; |
| |
| static const struct nfnetlink_subsystem nf_tables_subsys = { |
| .name = "nf_tables", |
| .subsys_id = NFNL_SUBSYS_NFTABLES, |
| .cb_count = NFT_MSG_MAX, |
| .cb = nf_tables_cb, |
| .commit = nf_tables_commit, |
| .abort = nf_tables_abort, |
| }; |
| |
| /* |
| * Loop detection - walk through the ruleset beginning at the destination chain |
| * of a new jump until either the source chain is reached (loop) or all |
| * reachable chains have been traversed. |
| * |
| * The loop check is performed whenever a new jump verdict is added to an |
| * expression or verdict map or a verdict map is bound to a new chain. |
| */ |
| |
| static int nf_tables_check_loops(const struct nft_ctx *ctx, |
| const struct nft_chain *chain); |
| |
| static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, |
| const struct nft_set *set, |
| const struct nft_set_iter *iter, |
| const struct nft_set_elem *elem) |
| { |
| if (elem->flags & NFT_SET_ELEM_INTERVAL_END) |
| return 0; |
| |
| switch (elem->data.verdict) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| return nf_tables_check_loops(ctx, elem->data.chain); |
| default: |
| return 0; |
| } |
| } |
| |
| static int nf_tables_check_loops(const struct nft_ctx *ctx, |
| const struct nft_chain *chain) |
| { |
| const struct nft_rule *rule; |
| const struct nft_expr *expr, *last; |
| const struct nft_set *set; |
| struct nft_set_binding *binding; |
| struct nft_set_iter iter; |
| |
| if (ctx->chain == chain) |
| return -ELOOP; |
| |
| list_for_each_entry(rule, &chain->rules, list) { |
| nft_rule_for_each_expr(expr, last, rule) { |
| const struct nft_data *data = NULL; |
| int err; |
| |
| if (!expr->ops->validate) |
| continue; |
| |
| err = expr->ops->validate(ctx, expr, &data); |
| if (err < 0) |
| return err; |
| |
| if (data == NULL) |
| continue; |
| |
| switch (data->verdict) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| err = nf_tables_check_loops(ctx, data->chain); |
| if (err < 0) |
| return err; |
| default: |
| break; |
| } |
| } |
| } |
| |
| list_for_each_entry(set, &ctx->table->sets, list) { |
| if (!(set->flags & NFT_SET_MAP) || |
| set->dtype != NFT_DATA_VERDICT) |
| continue; |
| |
| list_for_each_entry(binding, &set->bindings, list) { |
| if (binding->chain != chain) |
| continue; |
| |
| iter.skip = 0; |
| iter.count = 0; |
| iter.err = 0; |
| iter.fn = nf_tables_loop_check_setelem; |
| |
| set->ops->walk(ctx, set, &iter); |
| if (iter.err < 0) |
| return iter.err; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * nft_validate_input_register - validate an expressions' input register |
| * |
| * @reg: the register number |
| * |
| * Validate that the input register is one of the general purpose |
| * registers. |
| */ |
| int nft_validate_input_register(enum nft_registers reg) |
| { |
| if (reg <= NFT_REG_VERDICT) |
| return -EINVAL; |
| if (reg > NFT_REG_MAX) |
| return -ERANGE; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nft_validate_input_register); |
| |
| /** |
| * nft_validate_output_register - validate an expressions' output register |
| * |
| * @reg: the register number |
| * |
| * Validate that the output register is one of the general purpose |
| * registers or the verdict register. |
| */ |
| int nft_validate_output_register(enum nft_registers reg) |
| { |
| if (reg < NFT_REG_VERDICT) |
| return -EINVAL; |
| if (reg > NFT_REG_MAX) |
| return -ERANGE; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(nft_validate_output_register); |
| |
| /** |
| * nft_validate_data_load - validate an expressions' data load |
| * |
| * @ctx: context of the expression performing the load |
| * @reg: the destination register number |
| * @data: the data to load |
| * @type: the data type |
| * |
| * Validate that a data load uses the appropriate data type for |
| * the destination register. A value of NULL for the data means |
| * that its runtime gathered data, which is always of type |
| * NFT_DATA_VALUE. |
| */ |
| int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, |
| const struct nft_data *data, |
| enum nft_data_types type) |
| { |
| int err; |
| |
| switch (reg) { |
| case NFT_REG_VERDICT: |
| if (data == NULL || type != NFT_DATA_VERDICT) |
| return -EINVAL; |
| |
| if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) { |
| err = nf_tables_check_loops(ctx, data->chain); |
| if (err < 0) |
| return err; |
| |
| if (ctx->chain->level + 1 > data->chain->level) { |
| if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) |
| return -EMLINK; |
| data->chain->level = ctx->chain->level + 1; |
| } |
| } |
| |
| return 0; |
| default: |
| if (data != NULL && type != NFT_DATA_VALUE) |
| return -EINVAL; |
| return 0; |
| } |
| } |
| EXPORT_SYMBOL_GPL(nft_validate_data_load); |
| |
| static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { |
| [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, |
| [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, |
| .len = NFT_CHAIN_MAXNAMELEN - 1 }, |
| }; |
| |
| static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, |
| struct nft_data_desc *desc, const struct nlattr *nla) |
| { |
| struct nlattr *tb[NFTA_VERDICT_MAX + 1]; |
| struct nft_chain *chain; |
| int err; |
| |
| err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); |
| if (err < 0) |
| return err; |
| |
| if (!tb[NFTA_VERDICT_CODE]) |
| return -EINVAL; |
| data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); |
| |
| switch (data->verdict) { |
| default: |
| switch (data->verdict & NF_VERDICT_MASK) { |
| case NF_ACCEPT: |
| case NF_DROP: |
| case NF_QUEUE: |
| break; |
| default: |
| return -EINVAL; |
| } |
| /* fall through */ |
| case NFT_CONTINUE: |
| case NFT_BREAK: |
| case NFT_RETURN: |
| desc->len = sizeof(data->verdict); |
| break; |
| case NFT_JUMP: |
| case NFT_GOTO: |
| if (!tb[NFTA_VERDICT_CHAIN]) |
| return -EINVAL; |
| chain = nf_tables_chain_lookup(ctx->table, |
| tb[NFTA_VERDICT_CHAIN]); |
| if (IS_ERR(chain)) |
| return PTR_ERR(chain); |
| if (chain->flags & NFT_BASE_CHAIN) |
| return -EOPNOTSUPP; |
| |
| chain->use++; |
| data->chain = chain; |
| desc->len = sizeof(data); |
| break; |
| } |
| |
| desc->type = NFT_DATA_VERDICT; |
| return 0; |
| } |
| |
| static void nft_verdict_uninit(const struct nft_data *data) |
| { |
| switch (data->verdict) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| data->chain->use--; |
| break; |
| } |
| } |
| |
| static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) |
| { |
| struct nlattr *nest; |
| |
| nest = nla_nest_start(skb, NFTA_DATA_VERDICT); |
| if (!nest) |
| goto nla_put_failure; |
| |
| if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) |
| goto nla_put_failure; |
| |
| switch (data->verdict) { |
| case NFT_JUMP: |
| case NFT_GOTO: |
| if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) |
| goto nla_put_failure; |
| } |
| nla_nest_end(skb, nest); |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, |
| struct nft_data_desc *desc, const struct nlattr *nla) |
| { |
| unsigned int len; |
| |
| len = nla_len(nla); |
| if (len == 0) |
| return -EINVAL; |
| if (len > sizeof(data->data)) |
| return -EOVERFLOW; |
| |
| nla_memcpy(data->data, nla, sizeof(data->data)); |
| desc->type = NFT_DATA_VALUE; |
| desc->len = len; |
| return 0; |
| } |
| |
| static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, |
| unsigned int len) |
| { |
| return nla_put(skb, NFTA_DATA_VALUE, len, data->data); |
| } |
| |
| static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { |
| [NFTA_DATA_VALUE] = { .type = NLA_BINARY, |
| .len = FIELD_SIZEOF(struct nft_data, data) }, |
| [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, |
| }; |
| |
| /** |
| * nft_data_init - parse nf_tables data netlink attributes |
| * |
| * @ctx: context of the expression using the data |
| * @data: destination struct nft_data |
| * @desc: data description |
| * @nla: netlink attribute containing data |
| * |
| * Parse the netlink data attributes and initialize a struct nft_data. |
| * The type and length of data are returned in the data description. |
| * |
| * The caller can indicate that it only wants to accept data of type |
| * NFT_DATA_VALUE by passing NULL for the ctx argument. |
| */ |
| int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, |
| struct nft_data_desc *desc, const struct nlattr *nla) |
| { |
| struct nlattr *tb[NFTA_DATA_MAX + 1]; |
| int err; |
| |
| err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); |
| if (err < 0) |
| return err; |
| |
| if (tb[NFTA_DATA_VALUE]) |
| return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); |
| if (tb[NFTA_DATA_VERDICT] && ctx != NULL) |
| return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); |
| return -EINVAL; |
| } |
| EXPORT_SYMBOL_GPL(nft_data_init); |
| |
| /** |
| * nft_data_uninit - release a nft_data item |
| * |
| * @data: struct nft_data to release |
| * @type: type of data |
| * |
| * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, |
| * all others need to be released by calling this function. |
| */ |
| void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) |
| { |
| switch (type) { |
| case NFT_DATA_VALUE: |
| return; |
| case NFT_DATA_VERDICT: |
| return nft_verdict_uninit(data); |
| default: |
| WARN_ON(1); |
| } |
| } |
| EXPORT_SYMBOL_GPL(nft_data_uninit); |
| |
| int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, |
| enum nft_data_types type, unsigned int len) |
| { |
| struct nlattr *nest; |
| int err; |
| |
| nest = nla_nest_start(skb, attr); |
| if (nest == NULL) |
| return -1; |
| |
| switch (type) { |
| case NFT_DATA_VALUE: |
| err = nft_value_dump(skb, data, len); |
| break; |
| case NFT_DATA_VERDICT: |
| err = nft_verdict_dump(skb, data); |
| break; |
| default: |
| err = -EINVAL; |
| WARN_ON(1); |
| } |
| |
| nla_nest_end(skb, nest); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(nft_data_dump); |
| |
| static int nf_tables_init_net(struct net *net) |
| { |
| INIT_LIST_HEAD(&net->nft.af_info); |
| INIT_LIST_HEAD(&net->nft.commit_list); |
| return 0; |
| } |
| |
| static struct pernet_operations nf_tables_net_ops = { |
| .init = nf_tables_init_net, |
| }; |
| |
| static int __init nf_tables_module_init(void) |
| { |
| int err; |
| |
| info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, |
| GFP_KERNEL); |
| if (info == NULL) { |
| err = -ENOMEM; |
| goto err1; |
| } |
| |
| err = nf_tables_core_module_init(); |
| if (err < 0) |
| goto err2; |
| |
| err = nfnetlink_subsys_register(&nf_tables_subsys); |
| if (err < 0) |
| goto err3; |
| |
| pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); |
| return register_pernet_subsys(&nf_tables_net_ops); |
| err3: |
| nf_tables_core_module_exit(); |
| err2: |
| kfree(info); |
| err1: |
| return err; |
| } |
| |
| static void __exit nf_tables_module_exit(void) |
| { |
| unregister_pernet_subsys(&nf_tables_net_ops); |
| nfnetlink_subsys_unregister(&nf_tables_subsys); |
| nf_tables_core_module_exit(); |
| kfree(info); |
| } |
| |
| module_init(nf_tables_module_init); |
| module_exit(nf_tables_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |