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- /* Netfilter messages via netlink socket. Allows for user space
- * protocol helpers and general trouble making from userspace.
- *
- * (C) 2001 by Jay Schulist <jschlst@samba.org>,
- * (C) 2002-2005 by Harald Welte <laforge@gnumonks.org>
- * (C) 2005-2017 by Pablo Neira Ayuso <pablo@netfilter.org>
- *
- * Initial netfilter messages via netlink development funded and
- * generally made possible by Network Robots, Inc. (www.networkrobots.com)
- *
- * Further development of this code funded by Astaro AG (http://www.astaro.com)
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- */
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/socket.h>
- #include <linux/kernel.h>
- #include <linux/string.h>
- #include <linux/sockios.h>
- #include <linux/net.h>
- #include <linux/skbuff.h>
- #include <linux/uaccess.h>
- #include <net/sock.h>
- #include <linux/init.h>
- #include <linux/sched/signal.h>
- #include <net/netlink.h>
- #include <linux/netfilter/nfnetlink.h>
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
- MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NETFILTER);
- MODULE_DESCRIPTION("Netfilter messages via netlink socket");
- #define nfnl_dereference_protected(id) \
- rcu_dereference_protected(table[(id)].subsys, \
- lockdep_nfnl_is_held((id)))
- #define NFNL_MAX_ATTR_COUNT 32
- static struct {
- struct mutex mutex;
- const struct nfnetlink_subsystem __rcu *subsys;
- } table[NFNL_SUBSYS_COUNT];
- static struct lock_class_key nfnl_lockdep_keys[NFNL_SUBSYS_COUNT];
- static const char *const nfnl_lockdep_names[NFNL_SUBSYS_COUNT] = {
- [NFNL_SUBSYS_NONE] = "nfnl_subsys_none",
- [NFNL_SUBSYS_CTNETLINK] = "nfnl_subsys_ctnetlink",
- [NFNL_SUBSYS_CTNETLINK_EXP] = "nfnl_subsys_ctnetlink_exp",
- [NFNL_SUBSYS_QUEUE] = "nfnl_subsys_queue",
- [NFNL_SUBSYS_ULOG] = "nfnl_subsys_ulog",
- [NFNL_SUBSYS_OSF] = "nfnl_subsys_osf",
- [NFNL_SUBSYS_IPSET] = "nfnl_subsys_ipset",
- [NFNL_SUBSYS_ACCT] = "nfnl_subsys_acct",
- [NFNL_SUBSYS_CTNETLINK_TIMEOUT] = "nfnl_subsys_cttimeout",
- [NFNL_SUBSYS_CTHELPER] = "nfnl_subsys_cthelper",
- [NFNL_SUBSYS_NFTABLES] = "nfnl_subsys_nftables",
- [NFNL_SUBSYS_NFT_COMPAT] = "nfnl_subsys_nftcompat",
- };
- static const int nfnl_group2type[NFNLGRP_MAX+1] = {
- [NFNLGRP_CONNTRACK_NEW] = NFNL_SUBSYS_CTNETLINK,
- [NFNLGRP_CONNTRACK_UPDATE] = NFNL_SUBSYS_CTNETLINK,
- [NFNLGRP_CONNTRACK_DESTROY] = NFNL_SUBSYS_CTNETLINK,
- [NFNLGRP_CONNTRACK_EXP_NEW] = NFNL_SUBSYS_CTNETLINK_EXP,
- [NFNLGRP_CONNTRACK_EXP_UPDATE] = NFNL_SUBSYS_CTNETLINK_EXP,
- [NFNLGRP_CONNTRACK_EXP_DESTROY] = NFNL_SUBSYS_CTNETLINK_EXP,
- [NFNLGRP_NFTABLES] = NFNL_SUBSYS_NFTABLES,
- [NFNLGRP_ACCT_QUOTA] = NFNL_SUBSYS_ACCT,
- [NFNLGRP_NFTRACE] = NFNL_SUBSYS_NFTABLES,
- };
- void nfnl_lock(__u8 subsys_id)
- {
- mutex_lock(&table[subsys_id].mutex);
- }
- EXPORT_SYMBOL_GPL(nfnl_lock);
- void nfnl_unlock(__u8 subsys_id)
- {
- mutex_unlock(&table[subsys_id].mutex);
- }
- EXPORT_SYMBOL_GPL(nfnl_unlock);
- #ifdef CONFIG_PROVE_LOCKING
- bool lockdep_nfnl_is_held(u8 subsys_id)
- {
- return lockdep_is_held(&table[subsys_id].mutex);
- }
- EXPORT_SYMBOL_GPL(lockdep_nfnl_is_held);
- #endif
- int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n)
- {
- u8 cb_id;
- /* Sanity-check attr_count size to avoid stack buffer overflow. */
- for (cb_id = 0; cb_id < n->cb_count; cb_id++)
- if (WARN_ON(n->cb[cb_id].attr_count > NFNL_MAX_ATTR_COUNT))
- return -EINVAL;
- nfnl_lock(n->subsys_id);
- if (table[n->subsys_id].subsys) {
- nfnl_unlock(n->subsys_id);
- return -EBUSY;
- }
- rcu_assign_pointer(table[n->subsys_id].subsys, n);
- nfnl_unlock(n->subsys_id);
- return 0;
- }
- EXPORT_SYMBOL_GPL(nfnetlink_subsys_register);
- int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n)
- {
- nfnl_lock(n->subsys_id);
- table[n->subsys_id].subsys = NULL;
- nfnl_unlock(n->subsys_id);
- synchronize_rcu();
- return 0;
- }
- EXPORT_SYMBOL_GPL(nfnetlink_subsys_unregister);
- static inline const struct nfnetlink_subsystem *nfnetlink_get_subsys(u16 type)
- {
- u8 subsys_id = NFNL_SUBSYS_ID(type);
- if (subsys_id >= NFNL_SUBSYS_COUNT)
- return NULL;
- return rcu_dereference(table[subsys_id].subsys);
- }
- static inline const struct nfnl_callback *
- nfnetlink_find_client(u16 type, const struct nfnetlink_subsystem *ss)
- {
- u8 cb_id = NFNL_MSG_TYPE(type);
- if (cb_id >= ss->cb_count)
- return NULL;
- return &ss->cb[cb_id];
- }
- int nfnetlink_has_listeners(struct net *net, unsigned int group)
- {
- return netlink_has_listeners(net->nfnl, group);
- }
- EXPORT_SYMBOL_GPL(nfnetlink_has_listeners);
- int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid,
- unsigned int group, int echo, gfp_t flags)
- {
- return nlmsg_notify(net->nfnl, skb, portid, group, echo, flags);
- }
- EXPORT_SYMBOL_GPL(nfnetlink_send);
- int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error)
- {
- return netlink_set_err(net->nfnl, portid, group, error);
- }
- EXPORT_SYMBOL_GPL(nfnetlink_set_err);
- int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid)
- {
- int err;
- err = nlmsg_unicast(net->nfnl, skb, portid);
- if (err == -EAGAIN)
- err = -ENOBUFS;
- return err;
- }
- EXPORT_SYMBOL_GPL(nfnetlink_unicast);
- /* Process one complete nfnetlink message. */
- static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
- struct netlink_ext_ack *extack)
- {
- struct net *net = sock_net(skb->sk);
- const struct nfnl_callback *nc;
- const struct nfnetlink_subsystem *ss;
- int type, err;
- /* All the messages must at least contain nfgenmsg */
- if (nlmsg_len(nlh) < sizeof(struct nfgenmsg))
- return 0;
- type = nlh->nlmsg_type;
- replay:
- rcu_read_lock();
- ss = nfnetlink_get_subsys(type);
- if (!ss) {
- #ifdef CONFIG_MODULES
- rcu_read_unlock();
- request_module("nfnetlink-subsys-%d", NFNL_SUBSYS_ID(type));
- rcu_read_lock();
- ss = nfnetlink_get_subsys(type);
- if (!ss)
- #endif
- {
- rcu_read_unlock();
- return -EINVAL;
- }
- }
- nc = nfnetlink_find_client(type, ss);
- if (!nc) {
- rcu_read_unlock();
- return -EINVAL;
- }
- {
- int min_len = nlmsg_total_size(sizeof(struct nfgenmsg));
- u8 cb_id = NFNL_MSG_TYPE(nlh->nlmsg_type);
- struct nlattr *cda[NFNL_MAX_ATTR_COUNT + 1];
- struct nlattr *attr = (void *)nlh + min_len;
- int attrlen = nlh->nlmsg_len - min_len;
- __u8 subsys_id = NFNL_SUBSYS_ID(type);
- /* Sanity-check NFNL_MAX_ATTR_COUNT */
- if (ss->cb[cb_id].attr_count > NFNL_MAX_ATTR_COUNT) {
- rcu_read_unlock();
- return -ENOMEM;
- }
- err = nla_parse_deprecated(cda, ss->cb[cb_id].attr_count,
- attr, attrlen,
- ss->cb[cb_id].policy, extack);
- if (err < 0) {
- rcu_read_unlock();
- return err;
- }
- if (nc->call_rcu) {
- err = nc->call_rcu(net, net->nfnl, skb, nlh,
- (const struct nlattr **)cda,
- extack);
- rcu_read_unlock();
- } else {
- rcu_read_unlock();
- nfnl_lock(subsys_id);
- if (nfnl_dereference_protected(subsys_id) != ss ||
- nfnetlink_find_client(type, ss) != nc)
- err = -EAGAIN;
- else if (nc->call)
- err = nc->call(net, net->nfnl, skb, nlh,
- (const struct nlattr **)cda,
- extack);
- else
- err = -EINVAL;
- nfnl_unlock(subsys_id);
- }
- if (err == -EAGAIN)
- goto replay;
- return err;
- }
- }
- struct nfnl_err {
- struct list_head head;
- struct nlmsghdr *nlh;
- int err;
- struct netlink_ext_ack extack;
- };
- static int nfnl_err_add(struct list_head *list, struct nlmsghdr *nlh, int err,
- const struct netlink_ext_ack *extack)
- {
- struct nfnl_err *nfnl_err;
- nfnl_err = kmalloc(sizeof(struct nfnl_err), GFP_KERNEL);
- if (nfnl_err == NULL)
- return -ENOMEM;
- nfnl_err->nlh = nlh;
- nfnl_err->err = err;
- nfnl_err->extack = *extack;
- list_add_tail(&nfnl_err->head, list);
- return 0;
- }
- static void nfnl_err_del(struct nfnl_err *nfnl_err)
- {
- list_del(&nfnl_err->head);
- kfree(nfnl_err);
- }
- static void nfnl_err_reset(struct list_head *err_list)
- {
- struct nfnl_err *nfnl_err, *next;
- list_for_each_entry_safe(nfnl_err, next, err_list, head)
- nfnl_err_del(nfnl_err);
- }
- static void nfnl_err_deliver(struct list_head *err_list, struct sk_buff *skb)
- {
- struct nfnl_err *nfnl_err, *next;
- list_for_each_entry_safe(nfnl_err, next, err_list, head) {
- netlink_ack(skb, nfnl_err->nlh, nfnl_err->err,
- &nfnl_err->extack);
- nfnl_err_del(nfnl_err);
- }
- }
- enum {
- NFNL_BATCH_FAILURE = (1 << 0),
- NFNL_BATCH_DONE = (1 << 1),
- NFNL_BATCH_REPLAY = (1 << 2),
- };
- static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
- u16 subsys_id, u32 genid)
- {
- struct sk_buff *oskb = skb;
- struct net *net = sock_net(skb->sk);
- const struct nfnetlink_subsystem *ss;
- const struct nfnl_callback *nc;
- struct netlink_ext_ack extack;
- LIST_HEAD(err_list);
- u32 status;
- int err;
- if (subsys_id >= NFNL_SUBSYS_COUNT)
- return netlink_ack(skb, nlh, -EINVAL, NULL);
- replay:
- status = 0;
- replay_abort:
- skb = netlink_skb_clone(oskb, GFP_KERNEL);
- if (!skb)
- return netlink_ack(oskb, nlh, -ENOMEM, NULL);
- nfnl_lock(subsys_id);
- ss = nfnl_dereference_protected(subsys_id);
- if (!ss) {
- #ifdef CONFIG_MODULES
- nfnl_unlock(subsys_id);
- request_module("nfnetlink-subsys-%d", subsys_id);
- nfnl_lock(subsys_id);
- ss = nfnl_dereference_protected(subsys_id);
- if (!ss)
- #endif
- {
- nfnl_unlock(subsys_id);
- netlink_ack(oskb, nlh, -EOPNOTSUPP, NULL);
- return kfree_skb(skb);
- }
- }
- if (!ss->valid_genid || !ss->commit || !ss->abort) {
- nfnl_unlock(subsys_id);
- netlink_ack(oskb, nlh, -EOPNOTSUPP, NULL);
- return kfree_skb(skb);
- }
- if (!try_module_get(ss->owner)) {
- nfnl_unlock(subsys_id);
- netlink_ack(oskb, nlh, -EOPNOTSUPP, NULL);
- return kfree_skb(skb);
- }
- if (!ss->valid_genid(net, genid)) {
- module_put(ss->owner);
- nfnl_unlock(subsys_id);
- netlink_ack(oskb, nlh, -ERESTART, NULL);
- return kfree_skb(skb);
- }
- nfnl_unlock(subsys_id);
- while (skb->len >= nlmsg_total_size(0)) {
- int msglen, type;
- if (fatal_signal_pending(current)) {
- nfnl_err_reset(&err_list);
- err = -EINTR;
- status = NFNL_BATCH_FAILURE;
- goto done;
- }
- memset(&extack, 0, sizeof(extack));
- nlh = nlmsg_hdr(skb);
- err = 0;
- if (nlh->nlmsg_len < NLMSG_HDRLEN ||
- skb->len < nlh->nlmsg_len ||
- nlmsg_len(nlh) < sizeof(struct nfgenmsg)) {
- nfnl_err_reset(&err_list);
- status |= NFNL_BATCH_FAILURE;
- goto done;
- }
- /* Only requests are handled by the kernel */
- if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) {
- err = -EINVAL;
- goto ack;
- }
- type = nlh->nlmsg_type;
- if (type == NFNL_MSG_BATCH_BEGIN) {
- /* Malformed: Batch begin twice */
- nfnl_err_reset(&err_list);
- status |= NFNL_BATCH_FAILURE;
- goto done;
- } else if (type == NFNL_MSG_BATCH_END) {
- status |= NFNL_BATCH_DONE;
- goto done;
- } else if (type < NLMSG_MIN_TYPE) {
- err = -EINVAL;
- goto ack;
- }
- /* We only accept a batch with messages for the same
- * subsystem.
- */
- if (NFNL_SUBSYS_ID(type) != subsys_id) {
- err = -EINVAL;
- goto ack;
- }
- nc = nfnetlink_find_client(type, ss);
- if (!nc) {
- err = -EINVAL;
- goto ack;
- }
- {
- int min_len = nlmsg_total_size(sizeof(struct nfgenmsg));
- u8 cb_id = NFNL_MSG_TYPE(nlh->nlmsg_type);
- struct nlattr *cda[NFNL_MAX_ATTR_COUNT + 1];
- struct nlattr *attr = (void *)nlh + min_len;
- int attrlen = nlh->nlmsg_len - min_len;
- /* Sanity-check NFTA_MAX_ATTR */
- if (ss->cb[cb_id].attr_count > NFNL_MAX_ATTR_COUNT) {
- err = -ENOMEM;
- goto ack;
- }
- err = nla_parse_deprecated(cda,
- ss->cb[cb_id].attr_count,
- attr, attrlen,
- ss->cb[cb_id].policy, NULL);
- if (err < 0)
- goto ack;
- if (nc->call_batch) {
- err = nc->call_batch(net, net->nfnl, skb, nlh,
- (const struct nlattr **)cda,
- &extack);
- }
- /* The lock was released to autoload some module, we
- * have to abort and start from scratch using the
- * original skb.
- */
- if (err == -EAGAIN) {
- status |= NFNL_BATCH_REPLAY;
- goto done;
- }
- }
- ack:
- if (nlh->nlmsg_flags & NLM_F_ACK || err) {
- /* Errors are delivered once the full batch has been
- * processed, this avoids that the same error is
- * reported several times when replaying the batch.
- */
- if (nfnl_err_add(&err_list, nlh, err, &extack) < 0) {
- /* We failed to enqueue an error, reset the
- * list of errors and send OOM to userspace
- * pointing to the batch header.
- */
- nfnl_err_reset(&err_list);
- netlink_ack(oskb, nlmsg_hdr(oskb), -ENOMEM,
- NULL);
- status |= NFNL_BATCH_FAILURE;
- goto done;
- }
- /* We don't stop processing the batch on errors, thus,
- * userspace gets all the errors that the batch
- * triggers.
- */
- if (err)
- status |= NFNL_BATCH_FAILURE;
- }
- msglen = NLMSG_ALIGN(nlh->nlmsg_len);
- if (msglen > skb->len)
- msglen = skb->len;
- skb_pull(skb, msglen);
- }
- done:
- if (status & NFNL_BATCH_REPLAY) {
- ss->abort(net, oskb, NFNL_ABORT_AUTOLOAD);
- nfnl_err_reset(&err_list);
- kfree_skb(skb);
- module_put(ss->owner);
- goto replay;
- } else if (status == NFNL_BATCH_DONE) {
- err = ss->commit(net, oskb);
- if (err == -EAGAIN) {
- status |= NFNL_BATCH_REPLAY;
- goto done;
- } else if (err) {
- ss->abort(net, oskb, NFNL_ABORT_NONE);
- netlink_ack(oskb, nlmsg_hdr(oskb), err, NULL);
- }
- } else {
- enum nfnl_abort_action abort_action;
- if (status & NFNL_BATCH_FAILURE)
- abort_action = NFNL_ABORT_NONE;
- else
- abort_action = NFNL_ABORT_VALIDATE;
- err = ss->abort(net, oskb, abort_action);
- if (err == -EAGAIN) {
- nfnl_err_reset(&err_list);
- kfree_skb(skb);
- module_put(ss->owner);
- status |= NFNL_BATCH_FAILURE;
- goto replay_abort;
- }
- }
- if (ss->cleanup)
- ss->cleanup(net);
- nfnl_err_deliver(&err_list, oskb);
- kfree_skb(skb);
- module_put(ss->owner);
- }
- static const struct nla_policy nfnl_batch_policy[NFNL_BATCH_MAX + 1] = {
- [NFNL_BATCH_GENID] = { .type = NLA_U32 },
- };
- static void nfnetlink_rcv_skb_batch(struct sk_buff *skb, struct nlmsghdr *nlh)
- {
- int min_len = nlmsg_total_size(sizeof(struct nfgenmsg));
- struct nlattr *attr = (void *)nlh + min_len;
- struct nlattr *cda[NFNL_BATCH_MAX + 1];
- int attrlen = nlh->nlmsg_len - min_len;
- struct nfgenmsg *nfgenmsg;
- int msglen, err;
- u32 gen_id = 0;
- u16 res_id;
- msglen = NLMSG_ALIGN(nlh->nlmsg_len);
- if (msglen > skb->len)
- msglen = skb->len;
- if (skb->len < NLMSG_HDRLEN + sizeof(struct nfgenmsg))
- return;
- err = nla_parse_deprecated(cda, NFNL_BATCH_MAX, attr, attrlen,
- nfnl_batch_policy, NULL);
- if (err < 0) {
- netlink_ack(skb, nlh, err, NULL);
- return;
- }
- if (cda[NFNL_BATCH_GENID])
- gen_id = ntohl(nla_get_be32(cda[NFNL_BATCH_GENID]));
- nfgenmsg = nlmsg_data(nlh);
- skb_pull(skb, msglen);
- /* Work around old nft using host byte order */
- if (nfgenmsg->res_id == NFNL_SUBSYS_NFTABLES)
- res_id = NFNL_SUBSYS_NFTABLES;
- else
- res_id = ntohs(nfgenmsg->res_id);
- nfnetlink_rcv_batch(skb, nlh, res_id, gen_id);
- }
- static void nfnetlink_rcv(struct sk_buff *skb)
- {
- struct nlmsghdr *nlh = nlmsg_hdr(skb);
- if (skb->len < NLMSG_HDRLEN ||
- nlh->nlmsg_len < NLMSG_HDRLEN ||
- skb->len < nlh->nlmsg_len)
- return;
- if (!netlink_net_capable(skb, CAP_NET_ADMIN)) {
- netlink_ack(skb, nlh, -EPERM, NULL);
- return;
- }
- if (nlh->nlmsg_type == NFNL_MSG_BATCH_BEGIN)
- nfnetlink_rcv_skb_batch(skb, nlh);
- else
- netlink_rcv_skb(skb, nfnetlink_rcv_msg);
- }
- #ifdef CONFIG_MODULES
- static int nfnetlink_bind(struct net *net, int group)
- {
- const struct nfnetlink_subsystem *ss;
- int type;
- if (group <= NFNLGRP_NONE || group > NFNLGRP_MAX)
- return 0;
- type = nfnl_group2type[group];
- rcu_read_lock();
- ss = nfnetlink_get_subsys(type << 8);
- rcu_read_unlock();
- if (!ss)
- request_module_nowait("nfnetlink-subsys-%d", type);
- return 0;
- }
- #endif
- static int __net_init nfnetlink_net_init(struct net *net)
- {
- struct sock *nfnl;
- struct netlink_kernel_cfg cfg = {
- .groups = NFNLGRP_MAX,
- .input = nfnetlink_rcv,
- #ifdef CONFIG_MODULES
- .bind = nfnetlink_bind,
- #endif
- };
- nfnl = netlink_kernel_create(net, NETLINK_NETFILTER, &cfg);
- if (!nfnl)
- return -ENOMEM;
- net->nfnl_stash = nfnl;
- rcu_assign_pointer(net->nfnl, nfnl);
- return 0;
- }
- static void __net_exit nfnetlink_net_exit_batch(struct list_head *net_exit_list)
- {
- struct net *net;
- list_for_each_entry(net, net_exit_list, exit_list)
- RCU_INIT_POINTER(net->nfnl, NULL);
- synchronize_net();
- list_for_each_entry(net, net_exit_list, exit_list)
- netlink_kernel_release(net->nfnl_stash);
- }
- static struct pernet_operations nfnetlink_net_ops = {
- .init = nfnetlink_net_init,
- .exit_batch = nfnetlink_net_exit_batch,
- };
- static int __init nfnetlink_init(void)
- {
- int i;
- for (i = NFNLGRP_NONE + 1; i <= NFNLGRP_MAX; i++)
- BUG_ON(nfnl_group2type[i] == NFNL_SUBSYS_NONE);
- for (i=0; i<NFNL_SUBSYS_COUNT; i++)
- __mutex_init(&table[i].mutex, nfnl_lockdep_names[i], &nfnl_lockdep_keys[i]);
- return register_pernet_subsys(&nfnetlink_net_ops);
- }
- static void __exit nfnetlink_exit(void)
- {
- unregister_pernet_subsys(&nfnetlink_net_ops);
- }
- module_init(nfnetlink_init);
- module_exit(nfnetlink_exit);
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