From patchwork Sat Apr 6 12:17:45 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 234349 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 4400A2C0101 for ; Sat, 6 Apr 2013 23:19:14 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1163499Ab3DFMTJ (ORCPT ); Sat, 6 Apr 2013 08:19:09 -0400 Received: from mail.us.es ([193.147.175.20]:39108 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1163480Ab3DFMS4 (ORCPT ); Sat, 6 Apr 2013 08:18:56 -0400 Received: (qmail 29585 invoked from network); 6 Apr 2013 14:18:55 +0200 Received: from unknown (HELO us.es) (192.168.2.11) by us.es with SMTP; 6 Apr 2013 14:18:55 +0200 Received: (qmail 22844 invoked by uid 507); 6 Apr 2013 12:18:54 -0000 X-Qmail-Scanner-Diagnostics: from 127.0.0.1 by antivirus1 (envelope-from , uid 501) with qmail-scanner-2.10 (clamdscan: 0.97.7/16967. spamassassin: 3.3.2. 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Processed in 3.242403 secs); 06 Apr 2013 12:18:54 -0000 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on antivirus1 X-Spam-Level: X-Spam-Status: No, score=-98.6 required=7.5 tests=BAYES_50, RCVD_IN_SORBS_DUL, USER_IN_WHITELIST autolearn=disabled version=3.3.2 X-Envelope-From: pablo@netfilter.org Received: from unknown (HELO antivirus1) (127.0.0.1) by us.es with SMTP; 6 Apr 2013 12:18:51 -0000 Received: from 192.168.1.13 (192.168.1.13) by antivirus1 (F-Secure/fsigk_smtp/407/antivirus1); Sat, 06 Apr 2013 14:18:51 +0200 (CEST) X-Virus-Status: clean(F-Secure/fsigk_smtp/407/antivirus1) Received: (qmail 8146 invoked from network); 6 Apr 2013 14:18:51 +0200 Received: from dhcp103.vr.in-berlin.de (HELO soleta.in-berlin.de) (pneira@us.es@217.197.81.103) by us.es with SMTP; 6 Apr 2013 14:18:51 +0200 From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: davem@davemloft.net, netdev@vger.kernel.org Subject: [PATCH 46/51] netfilter: nfnetlink_queue: add net namespace support for nfnetlink_queue Date: Sat, 6 Apr 2013 14:17:45 +0200 Message-Id: <1365250670-14993-47-git-send-email-pablo@netfilter.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1365250670-14993-1-git-send-email-pablo@netfilter.org> References: <1365250670-14993-1-git-send-email-pablo@netfilter.org> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Gao feng This patch makes /proc/net/netfilter/nfnetlink_queue pernet. Moreover, there's a pernet instance table and lock. Signed-off-by: Gao feng Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nfnetlink_queue_core.c | 173 ++++++++++++++++++++++------------ 1 file changed, 113 insertions(+), 60 deletions(-) diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c index 19845e3..d20c52c 100644 --- a/net/netfilter/nfnetlink_queue_core.c +++ b/net/netfilter/nfnetlink_queue_core.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include @@ -66,10 +67,18 @@ struct nfqnl_instance { typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); -static DEFINE_SPINLOCK(instances_lock); +static int nfnl_queue_net_id __read_mostly; #define INSTANCE_BUCKETS 16 -static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly; +struct nfnl_queue_net { + spinlock_t instances_lock; + struct hlist_head instance_table[INSTANCE_BUCKETS]; +}; + +static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) +{ + return net_generic(net, nfnl_queue_net_id); +} static inline u_int8_t instance_hashfn(u_int16_t queue_num) { @@ -77,12 +86,12 @@ static inline u_int8_t instance_hashfn(u_int16_t queue_num) } static struct nfqnl_instance * -instance_lookup(u_int16_t queue_num) +instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) { struct hlist_head *head; struct nfqnl_instance *inst; - head = &instance_table[instance_hashfn(queue_num)]; + head = &q->instance_table[instance_hashfn(queue_num)]; hlist_for_each_entry_rcu(inst, head, hlist) { if (inst->queue_num == queue_num) return inst; @@ -91,14 +100,15 @@ instance_lookup(u_int16_t queue_num) } static struct nfqnl_instance * -instance_create(u_int16_t queue_num, int portid) +instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, + int portid) { struct nfqnl_instance *inst; unsigned int h; int err; - spin_lock(&instances_lock); - if (instance_lookup(queue_num)) { + spin_lock(&q->instances_lock); + if (instance_lookup(q, queue_num)) { err = -EEXIST; goto out_unlock; } @@ -123,16 +133,16 @@ instance_create(u_int16_t queue_num, int portid) } h = instance_hashfn(queue_num); - hlist_add_head_rcu(&inst->hlist, &instance_table[h]); + hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); - spin_unlock(&instances_lock); + spin_unlock(&q->instances_lock); return inst; out_free: kfree(inst); out_unlock: - spin_unlock(&instances_lock); + spin_unlock(&q->instances_lock); return ERR_PTR(err); } @@ -158,11 +168,11 @@ __instance_destroy(struct nfqnl_instance *inst) } static void -instance_destroy(struct nfqnl_instance *inst) +instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) { - spin_lock(&instances_lock); + spin_lock(&q->instances_lock); __instance_destroy(inst); - spin_unlock(&instances_lock); + spin_unlock(&q->instances_lock); } static inline void @@ -473,9 +483,12 @@ nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) int err = -ENOBUFS; __be32 *packet_id_ptr; int failopen = 0; + struct net *net = dev_net(entry->indev ? + entry->indev : entry->outdev); + struct nfnl_queue_net *q = nfnl_queue_pernet(net); /* rcu_read_lock()ed by nf_hook_slow() */ - queue = instance_lookup(queuenum); + queue = instance_lookup(q, queuenum); if (!queue) { err = -ESRCH; goto err_out; @@ -512,7 +525,7 @@ nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) *packet_id_ptr = htonl(entry->id); /* nfnetlink_unicast will either free the nskb or add it to a socket */ - err = nfnetlink_unicast(nskb, &init_net, queue->peer_portid, MSG_DONTWAIT); + err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); if (err < 0) { queue->queue_user_dropped++; goto err_out_unlock; @@ -625,15 +638,16 @@ dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) /* drop all packets with either indev or outdev == ifindex from all queue * instances */ static void -nfqnl_dev_drop(int ifindex) +nfqnl_dev_drop(struct net *net, int ifindex) { int i; + struct nfnl_queue_net *q = nfnl_queue_pernet(net); rcu_read_lock(); for (i = 0; i < INSTANCE_BUCKETS; i++) { struct nfqnl_instance *inst; - struct hlist_head *head = &instance_table[i]; + struct hlist_head *head = &q->instance_table[i]; hlist_for_each_entry_rcu(inst, head, hlist) nfqnl_flush(inst, dev_cmp, ifindex); @@ -650,12 +664,9 @@ nfqnl_rcv_dev_event(struct notifier_block *this, { struct net_device *dev = ptr; - if (!net_eq(dev_net(dev), &init_net)) - return NOTIFY_DONE; - /* Drop any packets associated with the downed device */ if (event == NETDEV_DOWN) - nfqnl_dev_drop(dev->ifindex); + nfqnl_dev_drop(dev_net(dev), dev->ifindex); return NOTIFY_DONE; } @@ -668,24 +679,24 @@ nfqnl_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) { struct netlink_notify *n = ptr; + struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { int i; /* destroy all instances for this portid */ - spin_lock(&instances_lock); + spin_lock(&q->instances_lock); for (i = 0; i < INSTANCE_BUCKETS; i++) { struct hlist_node *t2; struct nfqnl_instance *inst; - struct hlist_head *head = &instance_table[i]; + struct hlist_head *head = &q->instance_table[i]; hlist_for_each_entry_safe(inst, t2, head, hlist) { - if ((n->net == &init_net) && - (n->portid == inst->peer_portid)) + if (n->portid == inst->peer_portid) __instance_destroy(inst); } } - spin_unlock(&instances_lock); + spin_unlock(&q->instances_lock); } return NOTIFY_DONE; } @@ -706,11 +717,12 @@ static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { [NFQA_MARK] = { .type = NLA_U32 }, }; -static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlportid) +static struct nfqnl_instance * +verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid) { struct nfqnl_instance *queue; - queue = instance_lookup(queue_num); + queue = instance_lookup(q, queue_num); if (!queue) return ERR_PTR(-ENODEV); @@ -754,7 +766,11 @@ nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, LIST_HEAD(batch_list); u16 queue_num = ntohs(nfmsg->res_id); - queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid); + struct net *net = sock_net(ctnl); + struct nfnl_queue_net *q = nfnl_queue_pernet(net); + + queue = verdict_instance_lookup(q, queue_num, + NETLINK_CB(skb).portid); if (IS_ERR(queue)) return PTR_ERR(queue); @@ -802,10 +818,13 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, enum ip_conntrack_info uninitialized_var(ctinfo); struct nf_conn *ct = NULL; - queue = instance_lookup(queue_num); - if (!queue) + struct net *net = sock_net(ctnl); + struct nfnl_queue_net *q = nfnl_queue_pernet(net); - queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid); + queue = instance_lookup(q, queue_num); + if (!queue) + queue = verdict_instance_lookup(q, queue_num, + NETLINK_CB(skb).portid); if (IS_ERR(queue)) return PTR_ERR(queue); @@ -869,6 +888,8 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, u_int16_t queue_num = ntohs(nfmsg->res_id); struct nfqnl_instance *queue; struct nfqnl_msg_config_cmd *cmd = NULL; + struct net *net = sock_net(ctnl); + struct nfnl_queue_net *q = nfnl_queue_pernet(net); int ret = 0; if (nfqa[NFQA_CFG_CMD]) { @@ -882,7 +903,7 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, } rcu_read_lock(); - queue = instance_lookup(queue_num); + queue = instance_lookup(q, queue_num); if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { ret = -EPERM; goto err_out_unlock; @@ -895,7 +916,8 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, ret = -EBUSY; goto err_out_unlock; } - queue = instance_create(queue_num, NETLINK_CB(skb).portid); + queue = instance_create(q, queue_num, + NETLINK_CB(skb).portid); if (IS_ERR(queue)) { ret = PTR_ERR(queue); goto err_out_unlock; @@ -906,7 +928,7 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, ret = -ENODEV; goto err_out_unlock; } - instance_destroy(queue); + instance_destroy(q, queue); break; case NFQNL_CFG_CMD_PF_BIND: case NFQNL_CFG_CMD_PF_UNBIND: @@ -1000,19 +1022,24 @@ static const struct nfnetlink_subsystem nfqnl_subsys = { #ifdef CONFIG_PROC_FS struct iter_state { + struct seq_net_private p; unsigned int bucket; }; static struct hlist_node *get_first(struct seq_file *seq) { struct iter_state *st = seq->private; + struct net *net; + struct nfnl_queue_net *q; if (!st) return NULL; + net = seq_file_net(seq); + q = nfnl_queue_pernet(net); for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { - if (!hlist_empty(&instance_table[st->bucket])) - return instance_table[st->bucket].first; + if (!hlist_empty(&q->instance_table[st->bucket])) + return q->instance_table[st->bucket].first; } return NULL; } @@ -1020,13 +1047,17 @@ static struct hlist_node *get_first(struct seq_file *seq) static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) { struct iter_state *st = seq->private; + struct net *net = seq_file_net(seq); h = h->next; while (!h) { + struct nfnl_queue_net *q; + if (++st->bucket >= INSTANCE_BUCKETS) return NULL; - h = instance_table[st->bucket].first; + q = nfnl_queue_pernet(net); + h = q->instance_table[st->bucket].first; } return h; } @@ -1042,11 +1073,11 @@ static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) return pos ? NULL : head; } -static void *seq_start(struct seq_file *seq, loff_t *pos) - __acquires(instances_lock) +static void *seq_start(struct seq_file *s, loff_t *pos) + __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) { - spin_lock(&instances_lock); - return get_idx(seq, *pos); + spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); + return get_idx(s, *pos); } static void *seq_next(struct seq_file *s, void *v, loff_t *pos) @@ -1056,9 +1087,9 @@ static void *seq_next(struct seq_file *s, void *v, loff_t *pos) } static void seq_stop(struct seq_file *s, void *v) - __releases(instances_lock) + __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) { - spin_unlock(&instances_lock); + spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); } static int seq_show(struct seq_file *s, void *v) @@ -1082,7 +1113,7 @@ static const struct seq_operations nfqnl_seq_ops = { static int nfqnl_open(struct inode *inode, struct file *file) { - return seq_open_private(file, &nfqnl_seq_ops, + return seq_open_net(inode, file, &nfqnl_seq_ops, sizeof(struct iter_state)); } @@ -1091,39 +1122,63 @@ static const struct file_operations nfqnl_file_ops = { .open = nfqnl_open, .read = seq_read, .llseek = seq_lseek, - .release = seq_release_private, + .release = seq_release_net, }; #endif /* PROC_FS */ -static int __init nfnetlink_queue_init(void) +static int __net_init nfnl_queue_net_init(struct net *net) { - int i, status = -ENOMEM; + unsigned int i; + struct nfnl_queue_net *q = nfnl_queue_pernet(net); for (i = 0; i < INSTANCE_BUCKETS; i++) - INIT_HLIST_HEAD(&instance_table[i]); + INIT_HLIST_HEAD(&q->instance_table[i]); + + spin_lock_init(&q->instances_lock); + +#ifdef CONFIG_PROC_FS + if (!proc_create("nfnetlink_queue", 0440, + net->nf.proc_netfilter, &nfqnl_file_ops)) + return -ENOMEM; +#endif + return 0; +} + +static void __net_exit nfnl_queue_net_exit(struct net *net) +{ + remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); +} + +static struct pernet_operations nfnl_queue_net_ops = { + .init = nfnl_queue_net_init, + .exit = nfnl_queue_net_exit, + .id = &nfnl_queue_net_id, + .size = sizeof(struct nfnl_queue_net), +}; + +static int __init nfnetlink_queue_init(void) +{ + int status = -ENOMEM; netlink_register_notifier(&nfqnl_rtnl_notifier); status = nfnetlink_subsys_register(&nfqnl_subsys); if (status < 0) { - printk(KERN_ERR "nf_queue: failed to create netlink socket\n"); + pr_err("nf_queue: failed to create netlink socket\n"); goto cleanup_netlink_notifier; } -#ifdef CONFIG_PROC_FS - if (!proc_create("nfnetlink_queue", 0440, - proc_net_netfilter, &nfqnl_file_ops)) + status = register_pernet_subsys(&nfnl_queue_net_ops); + if (status < 0) { + pr_err("nf_queue: failed to register pernet ops\n"); goto cleanup_subsys; -#endif - + } register_netdevice_notifier(&nfqnl_dev_notifier); nf_register_queue_handler(&nfqh); return status; -#ifdef CONFIG_PROC_FS cleanup_subsys: nfnetlink_subsys_unregister(&nfqnl_subsys); -#endif cleanup_netlink_notifier: netlink_unregister_notifier(&nfqnl_rtnl_notifier); return status; @@ -1133,9 +1188,7 @@ static void __exit nfnetlink_queue_fini(void) { nf_unregister_queue_handler(); unregister_netdevice_notifier(&nfqnl_dev_notifier); -#ifdef CONFIG_PROC_FS - remove_proc_entry("nfnetlink_queue", proc_net_netfilter); -#endif + unregister_pernet_subsys(&nfnl_queue_net_ops); nfnetlink_subsys_unregister(&nfqnl_subsys); netlink_unregister_notifier(&nfqnl_rtnl_notifier);