Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This is a module which is used for queueing packets and communicating with |
Jesper Dangaard Brouer | 67137f3 | 2009-06-08 03:11:33 +0000 | [diff] [blame] | 3 | * userspace via nfnetlink. |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 4 | * |
| 5 | * (C) 2005 by Harald Welte <laforge@netfilter.org> |
Patrick McHardy | 4ad9d4f | 2007-12-05 01:31:17 -0800 | [diff] [blame] | 6 | * (C) 2007 by Patrick McHardy <kaber@trash.net> |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 7 | * |
| 8 | * Based on the old ipv4-only ip_queue.c: |
| 9 | * (C) 2000-2002 James Morris <jmorris@intercode.com.au> |
| 10 | * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License version 2 as |
| 14 | * published by the Free Software Foundation. |
| 15 | * |
| 16 | */ |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/skbuff.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/spinlock.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 22 | #include <linux/notifier.h> |
| 23 | #include <linux/netdevice.h> |
| 24 | #include <linux/netfilter.h> |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 25 | #include <linux/proc_fs.h> |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 26 | #include <linux/netfilter_ipv4.h> |
| 27 | #include <linux/netfilter_ipv6.h> |
| 28 | #include <linux/netfilter/nfnetlink.h> |
| 29 | #include <linux/netfilter/nfnetlink_queue.h> |
| 30 | #include <linux/list.h> |
| 31 | #include <net/sock.h> |
David S. Miller | 83111e7 | 2014-01-06 13:36:06 -0500 | [diff] [blame] | 32 | #include <net/tcp_states.h> |
Patrick McHardy | c01cd42 | 2007-12-05 01:24:48 -0800 | [diff] [blame] | 33 | #include <net/netfilter/nf_queue.h> |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 34 | #include <net/netns/generic.h> |
Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 35 | #include <net/netfilter/nfnetlink_queue.h> |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 36 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 37 | #include <linux/atomic.h> |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 38 | |
Pablo Neira Ayuso | 1109a90 | 2014-10-01 11:19:17 +0200 | [diff] [blame] | 39 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 40 | #include "../bridge/br_private.h" |
| 41 | #endif |
| 42 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 43 | #define NFQNL_QMAX_DEFAULT 1024 |
| 44 | |
Florian Westphal | 9cefbbc | 2013-06-04 22:22:15 +0000 | [diff] [blame] | 45 | /* We're using struct nlattr which has 16bit nla_len. Note that nla_len |
| 46 | * includes the header length. Thus, the maximum packet length that we |
| 47 | * support is 65531 bytes. We send truncated packets if the specified length |
| 48 | * is larger than that. Userspace can check for presence of NFQA_CAP_LEN |
| 49 | * attribute to detect truncation. |
| 50 | */ |
| 51 | #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) |
| 52 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 53 | struct nfqnl_instance { |
| 54 | struct hlist_node hlist; /* global list of queues */ |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 55 | struct rcu_head rcu; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 56 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 57 | int peer_portid; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 58 | unsigned int queue_maxlen; |
| 59 | unsigned int copy_range; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 60 | unsigned int queue_dropped; |
| 61 | unsigned int queue_user_dropped; |
| 62 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 63 | |
| 64 | u_int16_t queue_num; /* number of this queue */ |
| 65 | u_int8_t copy_mode; |
Krishna Kumar | fdb694a | 2012-05-24 03:56:44 +0000 | [diff] [blame] | 66 | u_int32_t flags; /* Set using NFQA_CFG_FLAGS */ |
Eric Dumazet | c463ac9 | 2010-06-09 18:07:06 +0200 | [diff] [blame] | 67 | /* |
| 68 | * Following fields are dirtied for each queued packet, |
| 69 | * keep them in same cache line if possible. |
| 70 | */ |
| 71 | spinlock_t lock; |
| 72 | unsigned int queue_total; |
Eric Dumazet | 5863702 | 2011-07-19 11:44:17 +0200 | [diff] [blame] | 73 | unsigned int id_sequence; /* 'sequence' of pkt ids */ |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 74 | struct list_head queue_list; /* packets in queue */ |
| 75 | }; |
| 76 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 77 | typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 78 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 79 | static int nfnl_queue_net_id __read_mostly; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 80 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 81 | #define INSTANCE_BUCKETS 16 |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 82 | struct nfnl_queue_net { |
| 83 | spinlock_t instances_lock; |
| 84 | struct hlist_head instance_table[INSTANCE_BUCKETS]; |
| 85 | }; |
| 86 | |
| 87 | static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net) |
| 88 | { |
| 89 | return net_generic(net, nfnl_queue_net_id); |
| 90 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 91 | |
| 92 | static inline u_int8_t instance_hashfn(u_int16_t queue_num) |
| 93 | { |
Pablo Neira Ayuso | 1cdb090 | 2013-03-14 06:03:17 +0000 | [diff] [blame] | 94 | return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | static struct nfqnl_instance * |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 98 | instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 99 | { |
| 100 | struct hlist_head *head; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 101 | struct nfqnl_instance *inst; |
| 102 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 103 | head = &q->instance_table[instance_hashfn(queue_num)]; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 104 | hlist_for_each_entry_rcu(inst, head, hlist) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 105 | if (inst->queue_num == queue_num) |
| 106 | return inst; |
| 107 | } |
| 108 | return NULL; |
| 109 | } |
| 110 | |
| 111 | static struct nfqnl_instance * |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 112 | instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, |
| 113 | int portid) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 114 | { |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 115 | struct nfqnl_instance *inst; |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 116 | unsigned int h; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 117 | int err; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 118 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 119 | spin_lock(&q->instances_lock); |
| 120 | if (instance_lookup(q, queue_num)) { |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 121 | err = -EEXIST; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 122 | goto out_unlock; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 123 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 124 | |
Harald Welte | 10dfdc6 | 2005-11-03 19:20:07 +0100 | [diff] [blame] | 125 | inst = kzalloc(sizeof(*inst), GFP_ATOMIC); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 126 | if (!inst) { |
| 127 | err = -ENOMEM; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 128 | goto out_unlock; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 129 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 130 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 131 | inst->queue_num = queue_num; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 132 | inst->peer_portid = portid; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 133 | inst->queue_maxlen = NFQNL_QMAX_DEFAULT; |
Florian Westphal | 9cefbbc | 2013-06-04 22:22:15 +0000 | [diff] [blame] | 134 | inst->copy_range = NFQNL_MAX_COPY_RANGE; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 135 | inst->copy_mode = NFQNL_COPY_NONE; |
YOSHIFUJI Hideaki | 181a46a | 2006-01-04 13:56:54 -0800 | [diff] [blame] | 136 | spin_lock_init(&inst->lock); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 137 | INIT_LIST_HEAD(&inst->queue_list); |
| 138 | |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 139 | if (!try_module_get(THIS_MODULE)) { |
| 140 | err = -EAGAIN; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 141 | goto out_free; |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 142 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 143 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 144 | h = instance_hashfn(queue_num); |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 145 | hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 146 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 147 | spin_unlock(&q->instances_lock); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 148 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 149 | return inst; |
| 150 | |
| 151 | out_free: |
| 152 | kfree(inst); |
| 153 | out_unlock: |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 154 | spin_unlock(&q->instances_lock); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 155 | return ERR_PTR(err); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 158 | static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, |
| 159 | unsigned long data); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 160 | |
| 161 | static void |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 162 | instance_destroy_rcu(struct rcu_head *head) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 163 | { |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 164 | struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance, |
| 165 | rcu); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 166 | |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 167 | nfqnl_flush(inst, NULL, 0); |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 168 | kfree(inst); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 169 | module_put(THIS_MODULE); |
| 170 | } |
| 171 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 172 | static void |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 173 | __instance_destroy(struct nfqnl_instance *inst) |
| 174 | { |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 175 | hlist_del_rcu(&inst->hlist); |
| 176 | call_rcu(&inst->rcu, instance_destroy_rcu); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 179 | static void |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 180 | instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 181 | { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 182 | spin_lock(&q->instances_lock); |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 183 | __instance_destroy(inst); |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 184 | spin_unlock(&q->instances_lock); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 185 | } |
| 186 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 187 | static inline void |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 188 | __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 189 | { |
Patrick McHardy | 0ac41e8 | 2007-12-05 01:25:03 -0800 | [diff] [blame] | 190 | list_add_tail(&entry->list, &queue->queue_list); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 191 | queue->queue_total++; |
| 192 | } |
| 193 | |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 194 | static void |
| 195 | __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry) |
| 196 | { |
| 197 | list_del(&entry->list); |
| 198 | queue->queue_total--; |
| 199 | } |
| 200 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 201 | static struct nf_queue_entry * |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 202 | find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 203 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 204 | struct nf_queue_entry *entry = NULL, *i; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 205 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 206 | spin_lock_bh(&queue->lock); |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 207 | |
| 208 | list_for_each_entry(i, &queue->queue_list, list) { |
| 209 | if (i->id == id) { |
| 210 | entry = i; |
| 211 | break; |
| 212 | } |
| 213 | } |
| 214 | |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 215 | if (entry) |
| 216 | __dequeue_entry(queue, entry); |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 217 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 218 | spin_unlock_bh(&queue->lock); |
| 219 | |
| 220 | return entry; |
| 221 | } |
| 222 | |
| 223 | static void |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 224 | nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 225 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 226 | struct nf_queue_entry *entry, *next; |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 227 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 228 | spin_lock_bh(&queue->lock); |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 229 | list_for_each_entry_safe(entry, next, &queue->queue_list, list) { |
| 230 | if (!cmpfn || cmpfn(entry, data)) { |
| 231 | list_del(&entry->list); |
| 232 | queue->queue_total--; |
Patrick McHardy | 4b3d15e | 2007-12-05 01:27:02 -0800 | [diff] [blame] | 233 | nf_reinject(entry, NF_DROP); |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 234 | } |
| 235 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 236 | spin_unlock_bh(&queue->lock); |
| 237 | } |
| 238 | |
Florian Westphal | 496e4ae | 2013-06-29 14:15:47 +0200 | [diff] [blame] | 239 | static int |
| 240 | nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, |
| 241 | bool csum_verify) |
Florian Westphal | 7237190 | 2013-04-19 04:58:26 +0000 | [diff] [blame] | 242 | { |
| 243 | __u32 flags = 0; |
| 244 | |
| 245 | if (packet->ip_summed == CHECKSUM_PARTIAL) |
| 246 | flags = NFQA_SKB_CSUMNOTREADY; |
Florian Westphal | 496e4ae | 2013-06-29 14:15:47 +0200 | [diff] [blame] | 247 | else if (csum_verify) |
| 248 | flags = NFQA_SKB_CSUM_NOTVERIFIED; |
| 249 | |
Florian Westphal | 7237190 | 2013-04-19 04:58:26 +0000 | [diff] [blame] | 250 | if (skb_is_gso(packet)) |
| 251 | flags |= NFQA_SKB_GSO; |
| 252 | |
| 253 | return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; |
| 254 | } |
| 255 | |
Valentina Giusti | 08c0cad | 2013-12-20 17:28:53 +0100 | [diff] [blame] | 256 | static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) |
| 257 | { |
| 258 | const struct cred *cred; |
| 259 | |
| 260 | if (sk->sk_state == TCP_TIME_WAIT) |
| 261 | return 0; |
| 262 | |
| 263 | read_lock_bh(&sk->sk_callback_lock); |
| 264 | if (sk->sk_socket && sk->sk_socket->file) { |
| 265 | cred = sk->sk_socket->file->f_cred; |
| 266 | if (nla_put_be32(skb, NFQA_UID, |
| 267 | htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) |
| 268 | goto nla_put_failure; |
| 269 | if (nla_put_be32(skb, NFQA_GID, |
| 270 | htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) |
| 271 | goto nla_put_failure; |
| 272 | } |
| 273 | read_unlock_bh(&sk->sk_callback_lock); |
| 274 | return 0; |
| 275 | |
| 276 | nla_put_failure: |
| 277 | read_unlock_bh(&sk->sk_callback_lock); |
| 278 | return -1; |
| 279 | } |
| 280 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 281 | static struct sk_buff * |
Gao feng | 7433268 | 2013-09-23 19:20:55 +0800 | [diff] [blame] | 282 | nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, |
Eric Dumazet | 5863702 | 2011-07-19 11:44:17 +0200 | [diff] [blame] | 283 | struct nf_queue_entry *entry, |
| 284 | __be32 **packet_id_ptr) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 285 | { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 286 | size_t size; |
Pablo Neira Ayuso | 6ee584b | 2012-09-24 14:52:12 +0200 | [diff] [blame] | 287 | size_t data_len = 0, cap_len = 0; |
Thomas Graf | af2806f | 2013-12-13 15:22:17 +0100 | [diff] [blame] | 288 | unsigned int hlen = 0; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 289 | struct sk_buff *skb; |
Eric Dumazet | 5863702 | 2011-07-19 11:44:17 +0200 | [diff] [blame] | 290 | struct nlattr *nla; |
| 291 | struct nfqnl_msg_packet_hdr *pmsg; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 292 | struct nlmsghdr *nlh; |
| 293 | struct nfgenmsg *nfmsg; |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 294 | struct sk_buff *entskb = entry->skb; |
| 295 | struct net_device *indev; |
| 296 | struct net_device *outdev; |
Pablo Neira Ayuso | 9cb0176 | 2012-06-07 12:13:39 +0200 | [diff] [blame] | 297 | struct nf_conn *ct = NULL; |
| 298 | enum ip_conntrack_info uninitialized_var(ctinfo); |
Florian Westphal | 496e4ae | 2013-06-29 14:15:47 +0200 | [diff] [blame] | 299 | bool csum_verify; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 300 | |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 301 | size = nlmsg_total_size(sizeof(struct nfgenmsg)) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 302 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) |
| 303 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 304 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Pablo Neira Ayuso | 1109a90 | 2014-10-01 11:19:17 +0200 | [diff] [blame] | 305 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 306 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
| 307 | + nla_total_size(sizeof(u_int32_t)) /* ifindex */ |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 308 | #endif |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 309 | + nla_total_size(sizeof(u_int32_t)) /* mark */ |
| 310 | + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) |
Florian Westphal | 7237190 | 2013-04-19 04:58:26 +0000 | [diff] [blame] | 311 | + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
Eric Dumazet | ae08ce0 | 2013-03-17 17:15:55 +0000 | [diff] [blame] | 312 | + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
| 313 | |
| 314 | if (entskb->tstamp.tv64) |
| 315 | size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 316 | |
Florian Westphal | 496e4ae | 2013-06-29 14:15:47 +0200 | [diff] [blame] | 317 | if (entry->hook <= NF_INET_FORWARD || |
| 318 | (entry->hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) |
| 319 | csum_verify = !skb_csum_unnecessary(entskb); |
| 320 | else |
| 321 | csum_verify = false; |
| 322 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 323 | outdev = entry->outdev; |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 324 | |
Eric Dumazet | c463ac9 | 2010-06-09 18:07:06 +0200 | [diff] [blame] | 325 | switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 326 | case NFQNL_COPY_META: |
| 327 | case NFQNL_COPY_NONE: |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 328 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 329 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 330 | case NFQNL_COPY_PACKET: |
Florian Westphal | 00bd1cc | 2013-04-19 04:58:27 +0000 | [diff] [blame] | 331 | if (!(queue->flags & NFQA_CFG_F_GSO) && |
| 332 | entskb->ip_summed == CHECKSUM_PARTIAL && |
Eric Dumazet | c463ac9 | 2010-06-09 18:07:06 +0200 | [diff] [blame] | 333 | skb_checksum_help(entskb)) |
Patrick McHardy | e7dfb09 | 2005-09-06 15:10:00 -0700 | [diff] [blame] | 334 | return NULL; |
Eric Dumazet | c463ac9 | 2010-06-09 18:07:06 +0200 | [diff] [blame] | 335 | |
| 336 | data_len = ACCESS_ONCE(queue->copy_range); |
Florian Westphal | 9cefbbc | 2013-06-04 22:22:15 +0000 | [diff] [blame] | 337 | if (data_len > entskb->len) |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 338 | data_len = entskb->len; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 339 | |
Thomas Graf | af2806f | 2013-12-13 15:22:17 +0100 | [diff] [blame] | 340 | hlen = skb_zerocopy_headlen(entskb); |
| 341 | hlen = min_t(unsigned int, hlen, data_len); |
Eric Dumazet | ae08ce0 | 2013-03-17 17:15:55 +0000 | [diff] [blame] | 342 | size += sizeof(struct nlattr) + hlen; |
Pablo Neira Ayuso | 6ee584b | 2012-09-24 14:52:12 +0200 | [diff] [blame] | 343 | cap_len = entskb->len; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 344 | break; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 345 | } |
| 346 | |
Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 347 | if (queue->flags & NFQA_CFG_F_CONNTRACK) |
| 348 | ct = nfqnl_ct_get(entskb, &size, &ctinfo); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 349 | |
Valentina Giusti | 08c0cad | 2013-12-20 17:28:53 +0100 | [diff] [blame] | 350 | if (queue->flags & NFQA_CFG_F_UID_GID) { |
| 351 | size += (nla_total_size(sizeof(u_int32_t)) /* uid */ |
| 352 | + nla_total_size(sizeof(u_int32_t))); /* gid */ |
| 353 | } |
| 354 | |
Gao feng | 7433268 | 2013-09-23 19:20:55 +0800 | [diff] [blame] | 355 | skb = nfnetlink_alloc_skb(net, size, queue->peer_portid, |
Patrick McHardy | 3ab1f68 | 2013-04-17 06:47:09 +0000 | [diff] [blame] | 356 | GFP_ATOMIC); |
Zoltan Kiss | 36d5fe6 | 2014-03-26 22:37:45 +0000 | [diff] [blame] | 357 | if (!skb) { |
| 358 | skb_tx_error(entskb); |
David S. Miller | 3da07c0 | 2012-06-26 21:35:27 -0700 | [diff] [blame] | 359 | return NULL; |
Zoltan Kiss | 36d5fe6 | 2014-03-26 22:37:45 +0000 | [diff] [blame] | 360 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 361 | |
David S. Miller | 3da07c0 | 2012-06-26 21:35:27 -0700 | [diff] [blame] | 362 | nlh = nlmsg_put(skb, 0, 0, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 363 | NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET, |
David S. Miller | 3da07c0 | 2012-06-26 21:35:27 -0700 | [diff] [blame] | 364 | sizeof(struct nfgenmsg), 0); |
| 365 | if (!nlh) { |
Zoltan Kiss | 36d5fe6 | 2014-03-26 22:37:45 +0000 | [diff] [blame] | 366 | skb_tx_error(entskb); |
David S. Miller | 3da07c0 | 2012-06-26 21:35:27 -0700 | [diff] [blame] | 367 | kfree_skb(skb); |
| 368 | return NULL; |
| 369 | } |
| 370 | nfmsg = nlmsg_data(nlh); |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 371 | nfmsg->nfgen_family = entry->pf; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 372 | nfmsg->version = NFNETLINK_V0; |
| 373 | nfmsg->res_id = htons(queue->queue_num); |
| 374 | |
Eric Dumazet | 5863702 | 2011-07-19 11:44:17 +0200 | [diff] [blame] | 375 | nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg)); |
| 376 | pmsg = nla_data(nla); |
| 377 | pmsg->hw_protocol = entskb->protocol; |
| 378 | pmsg->hook = entry->hook; |
| 379 | *packet_id_ptr = &pmsg->packet_id; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 380 | |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 381 | indev = entry->indev; |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 382 | if (indev) { |
Pablo Neira Ayuso | 1109a90 | 2014-10-01 11:19:17 +0200 | [diff] [blame] | 383 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 384 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex))) |
| 385 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 386 | #else |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 387 | if (entry->pf == PF_BRIDGE) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 388 | /* Case 1: indev is physical input device, we need to |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 389 | * look for bridge group (when called from |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 390 | * netfilter_bridge) */ |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 391 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
| 392 | htonl(indev->ifindex)) || |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 393 | /* this is the bridge group "brX" */ |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 394 | /* rcu_read_lock()ed by __nf_queue */ |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 395 | nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
| 396 | htonl(br_port_get_rcu(indev)->br->dev->ifindex))) |
| 397 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 398 | } else { |
| 399 | /* Case 2: indev is bridge group, we need to look for |
| 400 | * physical device (when called from ipv4) */ |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 401 | if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, |
| 402 | htonl(indev->ifindex))) |
| 403 | goto nla_put_failure; |
| 404 | if (entskb->nf_bridge && entskb->nf_bridge->physindev && |
| 405 | nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV, |
| 406 | htonl(entskb->nf_bridge->physindev->ifindex))) |
| 407 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 408 | } |
| 409 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 410 | } |
| 411 | |
Jesper Juhl | 3e4ead4 | 2006-01-05 12:15:58 -0800 | [diff] [blame] | 412 | if (outdev) { |
Pablo Neira Ayuso | 1109a90 | 2014-10-01 11:19:17 +0200 | [diff] [blame] | 413 | #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 414 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) |
| 415 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 416 | #else |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 417 | if (entry->pf == PF_BRIDGE) { |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 418 | /* Case 1: outdev is physical output device, we need to |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 419 | * look for bridge group (when called from |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 420 | * netfilter_bridge) */ |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 421 | if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
| 422 | htonl(outdev->ifindex)) || |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 423 | /* this is the bridge group "brX" */ |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 424 | /* rcu_read_lock()ed by __nf_queue */ |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 425 | nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
| 426 | htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) |
| 427 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 428 | } else { |
| 429 | /* Case 2: outdev is bridge group, we need to look for |
| 430 | * physical output device (when called from ipv4) */ |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 431 | if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, |
| 432 | htonl(outdev->ifindex))) |
| 433 | goto nla_put_failure; |
| 434 | if (entskb->nf_bridge && entskb->nf_bridge->physoutdev && |
| 435 | nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV, |
| 436 | htonl(entskb->nf_bridge->physoutdev->ifindex))) |
| 437 | goto nla_put_failure; |
Harald Welte | fbcd923 | 2005-08-09 20:22:10 -0700 | [diff] [blame] | 438 | } |
| 439 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 440 | } |
| 441 | |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 442 | if (entskb->mark && |
| 443 | nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark))) |
| 444 | goto nla_put_failure; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 445 | |
Nicolas Cavallari | 2c38de4 | 2011-06-16 17:27:04 +0200 | [diff] [blame] | 446 | if (indev && entskb->dev && |
| 447 | entskb->mac_header != entskb->network_header) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 448 | struct nfqnl_msg_packet_hw phw; |
Dan Carpenter | e4d091d | 2013-08-01 12:36:57 +0300 | [diff] [blame] | 449 | int len; |
| 450 | |
| 451 | memset(&phw, 0, sizeof(phw)); |
| 452 | len = dev_parse_header(entskb, phw.hw_addr); |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 453 | if (len) { |
| 454 | phw.hw_addrlen = htons(len); |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 455 | if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw)) |
| 456 | goto nla_put_failure; |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 457 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 458 | } |
| 459 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 460 | if (entskb->tstamp.tv64) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 461 | struct nfqnl_msg_packet_timestamp ts; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 462 | struct timeval tv = ktime_to_timeval(entskb->tstamp); |
| 463 | ts.sec = cpu_to_be64(tv.tv_sec); |
| 464 | ts.usec = cpu_to_be64(tv.tv_usec); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 465 | |
David S. Miller | a447189 | 2012-03-29 23:27:38 -0400 | [diff] [blame] | 466 | if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts)) |
| 467 | goto nla_put_failure; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 468 | } |
| 469 | |
Valentina Giusti | 08c0cad | 2013-12-20 17:28:53 +0100 | [diff] [blame] | 470 | if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk && |
| 471 | nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) |
| 472 | goto nla_put_failure; |
| 473 | |
Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 474 | if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) |
| 475 | goto nla_put_failure; |
Pablo Neira Ayuso | 9cb0176 | 2012-06-07 12:13:39 +0200 | [diff] [blame] | 476 | |
Florian Westphal | 7f87712 | 2013-06-04 22:22:16 +0000 | [diff] [blame] | 477 | if (cap_len > data_len && |
| 478 | nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) |
Pablo Neira Ayuso | 6ee584b | 2012-09-24 14:52:12 +0200 | [diff] [blame] | 479 | goto nla_put_failure; |
| 480 | |
Florian Westphal | 496e4ae | 2013-06-29 14:15:47 +0200 | [diff] [blame] | 481 | if (nfqnl_put_packet_info(skb, entskb, csum_verify)) |
Florian Westphal | 7237190 | 2013-04-19 04:58:26 +0000 | [diff] [blame] | 482 | goto nla_put_failure; |
| 483 | |
Eric Dumazet | ae08ce0 | 2013-03-17 17:15:55 +0000 | [diff] [blame] | 484 | if (data_len) { |
| 485 | struct nlattr *nla; |
| 486 | |
| 487 | if (skb_tailroom(skb) < sizeof(*nla) + hlen) |
| 488 | goto nla_put_failure; |
| 489 | |
| 490 | nla = (struct nlattr *)skb_put(skb, sizeof(*nla)); |
| 491 | nla->nla_type = NFQA_PAYLOAD; |
| 492 | nla->nla_len = nla_attr_size(data_len); |
| 493 | |
Zoltan Kiss | 36d5fe6 | 2014-03-26 22:37:45 +0000 | [diff] [blame] | 494 | if (skb_zerocopy(skb, entskb, data_len, hlen)) |
| 495 | goto nla_put_failure; |
Eric Dumazet | ae08ce0 | 2013-03-17 17:15:55 +0000 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | nlh->nlmsg_len = skb->len; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 499 | return skb; |
| 500 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 501 | nla_put_failure: |
Zoltan Kiss | 36d5fe6 | 2014-03-26 22:37:45 +0000 | [diff] [blame] | 502 | skb_tx_error(entskb); |
Wei Yongjun | a672995 | 2012-08-28 03:14:15 +0000 | [diff] [blame] | 503 | kfree_skb(skb); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 504 | net_err_ratelimited("nf_queue: error creating packet message\n"); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 505 | return NULL; |
| 506 | } |
| 507 | |
| 508 | static int |
Florian Westphal | a5fedd43 | 2013-04-19 04:58:25 +0000 | [diff] [blame] | 509 | __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, |
| 510 | struct nf_queue_entry *entry) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 511 | { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 512 | struct sk_buff *nskb; |
Florian Westphal | f158508 | 2011-01-18 15:27:28 +0100 | [diff] [blame] | 513 | int err = -ENOBUFS; |
Eric Dumazet | 5863702 | 2011-07-19 11:44:17 +0200 | [diff] [blame] | 514 | __be32 *packet_id_ptr; |
Krishna Kumar | fdb694a | 2012-05-24 03:56:44 +0000 | [diff] [blame] | 515 | int failopen = 0; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 516 | |
Gao feng | 7433268 | 2013-09-23 19:20:55 +0800 | [diff] [blame] | 517 | nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr); |
Florian Westphal | f158508 | 2011-01-18 15:27:28 +0100 | [diff] [blame] | 518 | if (nskb == NULL) { |
| 519 | err = -ENOMEM; |
Patrick McHardy | 0ef0f46 | 2007-12-05 01:31:01 -0800 | [diff] [blame] | 520 | goto err_out; |
Florian Westphal | f158508 | 2011-01-18 15:27:28 +0100 | [diff] [blame] | 521 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 522 | spin_lock_bh(&queue->lock); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 523 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 524 | if (queue->queue_total >= queue->queue_maxlen) { |
Krishna Kumar | fdb694a | 2012-05-24 03:56:44 +0000 | [diff] [blame] | 525 | if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { |
| 526 | failopen = 1; |
| 527 | err = 0; |
| 528 | } else { |
| 529 | queue->queue_dropped++; |
| 530 | net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n", |
| 531 | queue->queue_total); |
| 532 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 533 | goto err_out_free_nskb; |
| 534 | } |
Eric Dumazet | 5863702 | 2011-07-19 11:44:17 +0200 | [diff] [blame] | 535 | entry->id = ++queue->id_sequence; |
| 536 | *packet_id_ptr = htonl(entry->id); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 537 | |
| 538 | /* nfnetlink_unicast will either free the nskb or add it to a socket */ |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 539 | err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT); |
Patrick McHardy | 0ef0f46 | 2007-12-05 01:31:01 -0800 | [diff] [blame] | 540 | if (err < 0) { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 541 | queue->queue_user_dropped++; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 542 | goto err_out_unlock; |
| 543 | } |
| 544 | |
| 545 | __enqueue_entry(queue, entry); |
| 546 | |
| 547 | spin_unlock_bh(&queue->lock); |
Patrick McHardy | 0ef0f46 | 2007-12-05 01:31:01 -0800 | [diff] [blame] | 548 | return 0; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 549 | |
| 550 | err_out_free_nskb: |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 551 | kfree_skb(nskb); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 552 | err_out_unlock: |
| 553 | spin_unlock_bh(&queue->lock); |
Krishna Kumar | fdb694a | 2012-05-24 03:56:44 +0000 | [diff] [blame] | 554 | if (failopen) |
| 555 | nf_reinject(entry, NF_ACCEPT); |
Patrick McHardy | 0ef0f46 | 2007-12-05 01:31:01 -0800 | [diff] [blame] | 556 | err_out: |
Florian Westphal | f158508 | 2011-01-18 15:27:28 +0100 | [diff] [blame] | 557 | return err; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 558 | } |
| 559 | |
Florian Westphal | a5fedd43 | 2013-04-19 04:58:25 +0000 | [diff] [blame] | 560 | static struct nf_queue_entry * |
| 561 | nf_queue_entry_dup(struct nf_queue_entry *e) |
| 562 | { |
| 563 | struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC); |
| 564 | if (entry) { |
| 565 | if (nf_queue_entry_get_refs(entry)) |
| 566 | return entry; |
| 567 | kfree(entry); |
| 568 | } |
| 569 | return NULL; |
| 570 | } |
| 571 | |
Pablo Neira Ayuso | 1109a90 | 2014-10-01 11:19:17 +0200 | [diff] [blame] | 572 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
Florian Westphal | a5fedd43 | 2013-04-19 04:58:25 +0000 | [diff] [blame] | 573 | /* When called from bridge netfilter, skb->data must point to MAC header |
| 574 | * before calling skb_gso_segment(). Else, original MAC header is lost |
| 575 | * and segmented skbs will be sent to wrong destination. |
| 576 | */ |
| 577 | static void nf_bridge_adjust_skb_data(struct sk_buff *skb) |
| 578 | { |
| 579 | if (skb->nf_bridge) |
| 580 | __skb_push(skb, skb->network_header - skb->mac_header); |
| 581 | } |
| 582 | |
| 583 | static void nf_bridge_adjust_segmented_data(struct sk_buff *skb) |
| 584 | { |
| 585 | if (skb->nf_bridge) |
| 586 | __skb_pull(skb, skb->network_header - skb->mac_header); |
| 587 | } |
| 588 | #else |
| 589 | #define nf_bridge_adjust_skb_data(s) do {} while (0) |
| 590 | #define nf_bridge_adjust_segmented_data(s) do {} while (0) |
| 591 | #endif |
| 592 | |
| 593 | static void free_entry(struct nf_queue_entry *entry) |
| 594 | { |
| 595 | nf_queue_entry_release_refs(entry); |
| 596 | kfree(entry); |
| 597 | } |
| 598 | |
| 599 | static int |
| 600 | __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue, |
| 601 | struct sk_buff *skb, struct nf_queue_entry *entry) |
| 602 | { |
| 603 | int ret = -ENOMEM; |
| 604 | struct nf_queue_entry *entry_seg; |
| 605 | |
| 606 | nf_bridge_adjust_segmented_data(skb); |
| 607 | |
| 608 | if (skb->next == NULL) { /* last packet, no need to copy entry */ |
| 609 | struct sk_buff *gso_skb = entry->skb; |
| 610 | entry->skb = skb; |
| 611 | ret = __nfqnl_enqueue_packet(net, queue, entry); |
| 612 | if (ret) |
| 613 | entry->skb = gso_skb; |
| 614 | return ret; |
| 615 | } |
| 616 | |
| 617 | skb->next = NULL; |
| 618 | |
| 619 | entry_seg = nf_queue_entry_dup(entry); |
| 620 | if (entry_seg) { |
| 621 | entry_seg->skb = skb; |
| 622 | ret = __nfqnl_enqueue_packet(net, queue, entry_seg); |
| 623 | if (ret) |
| 624 | free_entry(entry_seg); |
| 625 | } |
| 626 | return ret; |
| 627 | } |
| 628 | |
| 629 | static int |
| 630 | nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) |
| 631 | { |
| 632 | unsigned int queued; |
| 633 | struct nfqnl_instance *queue; |
| 634 | struct sk_buff *skb, *segs; |
| 635 | int err = -ENOBUFS; |
| 636 | struct net *net = dev_net(entry->indev ? |
| 637 | entry->indev : entry->outdev); |
| 638 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
| 639 | |
| 640 | /* rcu_read_lock()ed by nf_hook_slow() */ |
| 641 | queue = instance_lookup(q, queuenum); |
| 642 | if (!queue) |
| 643 | return -ESRCH; |
| 644 | |
| 645 | if (queue->copy_mode == NFQNL_COPY_NONE) |
| 646 | return -EINVAL; |
| 647 | |
Florian Westphal | a5fedd43 | 2013-04-19 04:58:25 +0000 | [diff] [blame] | 648 | skb = entry->skb; |
| 649 | |
| 650 | switch (entry->pf) { |
| 651 | case NFPROTO_IPV4: |
| 652 | skb->protocol = htons(ETH_P_IP); |
| 653 | break; |
| 654 | case NFPROTO_IPV6: |
| 655 | skb->protocol = htons(ETH_P_IPV6); |
| 656 | break; |
| 657 | } |
| 658 | |
Pablo Neira Ayuso | 7b8dfe2 | 2013-06-07 18:42:00 +0200 | [diff] [blame] | 659 | if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb)) |
| 660 | return __nfqnl_enqueue_packet(net, queue, entry); |
| 661 | |
Florian Westphal | a5fedd43 | 2013-04-19 04:58:25 +0000 | [diff] [blame] | 662 | nf_bridge_adjust_skb_data(skb); |
| 663 | segs = skb_gso_segment(skb, 0); |
| 664 | /* Does not use PTR_ERR to limit the number of error codes that can be |
| 665 | * returned by nf_queue. For instance, callers rely on -ECANCELED to |
| 666 | * mean 'ignore this hook'. |
| 667 | */ |
| 668 | if (IS_ERR(segs)) |
| 669 | goto out_err; |
| 670 | queued = 0; |
| 671 | err = 0; |
| 672 | do { |
| 673 | struct sk_buff *nskb = segs->next; |
| 674 | if (err == 0) |
| 675 | err = __nfqnl_enqueue_packet_gso(net, queue, |
| 676 | segs, entry); |
| 677 | if (err == 0) |
| 678 | queued++; |
| 679 | else |
| 680 | kfree_skb(segs); |
| 681 | segs = nskb; |
| 682 | } while (segs); |
| 683 | |
| 684 | if (queued) { |
| 685 | if (err) /* some segments are already queued */ |
| 686 | free_entry(entry); |
| 687 | kfree_skb(skb); |
| 688 | return 0; |
| 689 | } |
| 690 | out_err: |
| 691 | nf_bridge_adjust_segmented_data(skb); |
| 692 | return err; |
| 693 | } |
| 694 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 695 | static int |
Pablo Neira Ayuso | 8c88f87 | 2012-06-07 13:31:25 +0200 | [diff] [blame] | 696 | nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 697 | { |
Patrick McHardy | e2b58a6 | 2008-02-19 17:17:52 -0800 | [diff] [blame] | 698 | struct sk_buff *nskb; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 699 | |
Patrick McHardy | d8a585d | 2006-11-14 19:48:09 -0800 | [diff] [blame] | 700 | if (diff < 0) { |
| 701 | if (pskb_trim(e->skb, data_len)) |
| 702 | return -ENOMEM; |
| 703 | } else if (diff > 0) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 704 | if (data_len > 0xFFFF) |
| 705 | return -EINVAL; |
| 706 | if (diff > skb_tailroom(e->skb)) { |
Arnaud Ebalard | 9a732ed | 2008-04-29 03:16:34 -0700 | [diff] [blame] | 707 | nskb = skb_copy_expand(e->skb, skb_headroom(e->skb), |
| 708 | diff, GFP_ATOMIC); |
Patrick McHardy | e2b58a6 | 2008-02-19 17:17:52 -0800 | [diff] [blame] | 709 | if (!nskb) { |
Patrick McHardy | 1158ba2 | 2006-08-22 00:32:47 -0700 | [diff] [blame] | 710 | printk(KERN_WARNING "nf_queue: OOM " |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 711 | "in mangle, dropping packet\n"); |
Patrick McHardy | e2b58a6 | 2008-02-19 17:17:52 -0800 | [diff] [blame] | 712 | return -ENOMEM; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 713 | } |
Patrick McHardy | e2b58a6 | 2008-02-19 17:17:52 -0800 | [diff] [blame] | 714 | kfree_skb(e->skb); |
| 715 | e->skb = nskb; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 716 | } |
| 717 | skb_put(e->skb, diff); |
| 718 | } |
Herbert Xu | 37d4187 | 2007-10-14 00:39:18 -0700 | [diff] [blame] | 719 | if (!skb_make_writable(e->skb, data_len)) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 720 | return -ENOMEM; |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 721 | skb_copy_to_linear_data(e->skb, data, data_len); |
Patrick McHardy | e7dfb09 | 2005-09-06 15:10:00 -0700 | [diff] [blame] | 722 | e->skb->ip_summed = CHECKSUM_NONE; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 723 | return 0; |
| 724 | } |
| 725 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 726 | static int |
| 727 | nfqnl_set_mode(struct nfqnl_instance *queue, |
| 728 | unsigned char mode, unsigned int range) |
| 729 | { |
Patrick McHardy | c5de0df | 2007-12-05 01:29:05 -0800 | [diff] [blame] | 730 | int status = 0; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 731 | |
| 732 | spin_lock_bh(&queue->lock); |
Patrick McHardy | c5de0df | 2007-12-05 01:29:05 -0800 | [diff] [blame] | 733 | switch (mode) { |
| 734 | case NFQNL_COPY_NONE: |
| 735 | case NFQNL_COPY_META: |
| 736 | queue->copy_mode = mode; |
| 737 | queue->copy_range = 0; |
| 738 | break; |
| 739 | |
| 740 | case NFQNL_COPY_PACKET: |
| 741 | queue->copy_mode = mode; |
Florian Westphal | 9cefbbc | 2013-06-04 22:22:15 +0000 | [diff] [blame] | 742 | if (range == 0 || range > NFQNL_MAX_COPY_RANGE) |
| 743 | queue->copy_range = NFQNL_MAX_COPY_RANGE; |
Patrick McHardy | c5de0df | 2007-12-05 01:29:05 -0800 | [diff] [blame] | 744 | else |
| 745 | queue->copy_range = range; |
| 746 | break; |
| 747 | |
| 748 | default: |
| 749 | status = -EINVAL; |
| 750 | |
| 751 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 752 | spin_unlock_bh(&queue->lock); |
| 753 | |
| 754 | return status; |
| 755 | } |
| 756 | |
| 757 | static int |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 758 | dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 759 | { |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 760 | if (entry->indev) |
| 761 | if (entry->indev->ifindex == ifindex) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 762 | return 1; |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 763 | if (entry->outdev) |
| 764 | if (entry->outdev->ifindex == ifindex) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 765 | return 1; |
Pablo Neira Ayuso | 1109a90 | 2014-10-01 11:19:17 +0200 | [diff] [blame] | 766 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
Patrick McHardy | ef47c6a7 | 2006-06-27 03:01:48 -0700 | [diff] [blame] | 767 | if (entry->skb->nf_bridge) { |
| 768 | if (entry->skb->nf_bridge->physindev && |
| 769 | entry->skb->nf_bridge->physindev->ifindex == ifindex) |
| 770 | return 1; |
| 771 | if (entry->skb->nf_bridge->physoutdev && |
| 772 | entry->skb->nf_bridge->physoutdev->ifindex == ifindex) |
| 773 | return 1; |
| 774 | } |
| 775 | #endif |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 776 | return 0; |
| 777 | } |
| 778 | |
| 779 | /* drop all packets with either indev or outdev == ifindex from all queue |
| 780 | * instances */ |
| 781 | static void |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 782 | nfqnl_dev_drop(struct net *net, int ifindex) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 783 | { |
| 784 | int i; |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 785 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 786 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 787 | rcu_read_lock(); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 788 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 789 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 790 | struct nfqnl_instance *inst; |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 791 | struct hlist_head *head = &q->instance_table[i]; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 792 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 793 | hlist_for_each_entry_rcu(inst, head, hlist) |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 794 | nfqnl_flush(inst, dev_cmp, ifindex); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 795 | } |
| 796 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 797 | rcu_read_unlock(); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 798 | } |
| 799 | |
| 800 | #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) |
| 801 | |
| 802 | static int |
| 803 | nfqnl_rcv_dev_event(struct notifier_block *this, |
| 804 | unsigned long event, void *ptr) |
| 805 | { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 806 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 807 | |
| 808 | /* Drop any packets associated with the downed device */ |
| 809 | if (event == NETDEV_DOWN) |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 810 | nfqnl_dev_drop(dev_net(dev), dev->ifindex); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 811 | return NOTIFY_DONE; |
| 812 | } |
| 813 | |
| 814 | static struct notifier_block nfqnl_dev_notifier = { |
| 815 | .notifier_call = nfqnl_rcv_dev_event, |
| 816 | }; |
| 817 | |
| 818 | static int |
| 819 | nfqnl_rcv_nl_event(struct notifier_block *this, |
| 820 | unsigned long event, void *ptr) |
| 821 | { |
| 822 | struct netlink_notify *n = ptr; |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 823 | struct nfnl_queue_net *q = nfnl_queue_pernet(n->net); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 824 | |
Patrick McHardy | dee5817 | 2009-11-06 17:04:00 +0100 | [diff] [blame] | 825 | if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 826 | int i; |
| 827 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 828 | /* destroy all instances for this portid */ |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 829 | spin_lock(&q->instances_lock); |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 830 | for (i = 0; i < INSTANCE_BUCKETS; i++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 831 | struct hlist_node *t2; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 832 | struct nfqnl_instance *inst; |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 833 | struct hlist_head *head = &q->instance_table[i]; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 834 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 835 | hlist_for_each_entry_safe(inst, t2, head, hlist) { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 836 | if (n->portid == inst->peer_portid) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 837 | __instance_destroy(inst); |
| 838 | } |
| 839 | } |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 840 | spin_unlock(&q->instances_lock); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 841 | } |
| 842 | return NOTIFY_DONE; |
| 843 | } |
| 844 | |
| 845 | static struct notifier_block nfqnl_rtnl_notifier = { |
| 846 | .notifier_call = nfqnl_rcv_nl_event, |
| 847 | }; |
| 848 | |
Patrick McHardy | 5bf7585 | 2007-09-28 14:39:26 -0700 | [diff] [blame] | 849 | static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { |
| 850 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, |
| 851 | [NFQA_MARK] = { .type = NLA_U32 }, |
| 852 | [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, |
Pablo Neira Ayuso | 9cb0176 | 2012-06-07 12:13:39 +0200 | [diff] [blame] | 853 | [NFQA_CT] = { .type = NLA_UNSPEC }, |
Pablo Neira Ayuso | bd07793 | 2013-08-07 18:13:20 +0200 | [diff] [blame] | 854 | [NFQA_EXP] = { .type = NLA_UNSPEC }, |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 855 | }; |
| 856 | |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 857 | static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { |
| 858 | [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) }, |
| 859 | [NFQA_MARK] = { .type = NLA_U32 }, |
| 860 | }; |
| 861 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 862 | static struct nfqnl_instance * |
| 863 | verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid) |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 864 | { |
| 865 | struct nfqnl_instance *queue; |
| 866 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 867 | queue = instance_lookup(q, queue_num); |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 868 | if (!queue) |
| 869 | return ERR_PTR(-ENODEV); |
| 870 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 871 | if (queue->peer_portid != nlportid) |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 872 | return ERR_PTR(-EPERM); |
| 873 | |
| 874 | return queue; |
| 875 | } |
| 876 | |
| 877 | static struct nfqnl_msg_verdict_hdr* |
| 878 | verdicthdr_get(const struct nlattr * const nfqa[]) |
| 879 | { |
| 880 | struct nfqnl_msg_verdict_hdr *vhdr; |
| 881 | unsigned int verdict; |
| 882 | |
| 883 | if (!nfqa[NFQA_VERDICT_HDR]) |
| 884 | return NULL; |
| 885 | |
| 886 | vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]); |
Florian Westphal | c667523 | 2011-08-30 15:01:20 +0200 | [diff] [blame] | 887 | verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK; |
| 888 | if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN) |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 889 | return NULL; |
| 890 | return vhdr; |
| 891 | } |
| 892 | |
| 893 | static int nfq_id_after(unsigned int id, unsigned int max) |
| 894 | { |
| 895 | return (int)(id - max) > 0; |
| 896 | } |
| 897 | |
| 898 | static int |
| 899 | nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb, |
| 900 | const struct nlmsghdr *nlh, |
| 901 | const struct nlattr * const nfqa[]) |
| 902 | { |
David S. Miller | 3da07c0 | 2012-06-26 21:35:27 -0700 | [diff] [blame] | 903 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 904 | struct nf_queue_entry *entry, *tmp; |
| 905 | unsigned int verdict, maxid; |
| 906 | struct nfqnl_msg_verdict_hdr *vhdr; |
| 907 | struct nfqnl_instance *queue; |
| 908 | LIST_HEAD(batch_list); |
| 909 | u16 queue_num = ntohs(nfmsg->res_id); |
| 910 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 911 | struct net *net = sock_net(ctnl); |
| 912 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
| 913 | |
| 914 | queue = verdict_instance_lookup(q, queue_num, |
| 915 | NETLINK_CB(skb).portid); |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 916 | if (IS_ERR(queue)) |
| 917 | return PTR_ERR(queue); |
| 918 | |
| 919 | vhdr = verdicthdr_get(nfqa); |
| 920 | if (!vhdr) |
| 921 | return -EINVAL; |
| 922 | |
| 923 | verdict = ntohl(vhdr->verdict); |
| 924 | maxid = ntohl(vhdr->id); |
| 925 | |
| 926 | spin_lock_bh(&queue->lock); |
| 927 | |
| 928 | list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) { |
| 929 | if (nfq_id_after(entry->id, maxid)) |
| 930 | break; |
| 931 | __dequeue_entry(queue, entry); |
| 932 | list_add_tail(&entry->list, &batch_list); |
| 933 | } |
| 934 | |
| 935 | spin_unlock_bh(&queue->lock); |
| 936 | |
| 937 | if (list_empty(&batch_list)) |
| 938 | return -ENOENT; |
| 939 | |
| 940 | list_for_each_entry_safe(entry, tmp, &batch_list, list) { |
| 941 | if (nfqa[NFQA_MARK]) |
| 942 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
| 943 | nf_reinject(entry, verdict); |
| 944 | } |
| 945 | return 0; |
| 946 | } |
| 947 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 948 | static int |
| 949 | nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 950 | const struct nlmsghdr *nlh, |
| 951 | const struct nlattr * const nfqa[]) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 952 | { |
David S. Miller | 3da07c0 | 2012-06-26 21:35:27 -0700 | [diff] [blame] | 953 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 954 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
| 955 | |
| 956 | struct nfqnl_msg_verdict_hdr *vhdr; |
| 957 | struct nfqnl_instance *queue; |
| 958 | unsigned int verdict; |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 959 | struct nf_queue_entry *entry; |
Pablo Neira Ayuso | 8c88f87 | 2012-06-07 13:31:25 +0200 | [diff] [blame] | 960 | enum ip_conntrack_info uninitialized_var(ctinfo); |
| 961 | struct nf_conn *ct = NULL; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 962 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 963 | struct net *net = sock_net(ctnl); |
| 964 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 965 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 966 | queue = instance_lookup(q, queue_num); |
| 967 | if (!queue) |
| 968 | queue = verdict_instance_lookup(q, queue_num, |
| 969 | NETLINK_CB(skb).portid); |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 970 | if (IS_ERR(queue)) |
| 971 | return PTR_ERR(queue); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 972 | |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 973 | vhdr = verdicthdr_get(nfqa); |
| 974 | if (!vhdr) |
Eric Dumazet | 84a797d | 2011-07-18 16:08:27 +0200 | [diff] [blame] | 975 | return -EINVAL; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 976 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 977 | verdict = ntohl(vhdr->verdict); |
| 978 | |
Patrick McHardy | b43d8d8 | 2007-12-05 01:25:30 -0800 | [diff] [blame] | 979 | entry = find_dequeue_entry(queue, ntohl(vhdr->id)); |
Eric Dumazet | 84a797d | 2011-07-18 16:08:27 +0200 | [diff] [blame] | 980 | if (entry == NULL) |
| 981 | return -ENOENT; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 982 | |
Pablo Neira Ayuso | bd07793 | 2013-08-07 18:13:20 +0200 | [diff] [blame] | 983 | if (nfqa[NFQA_CT]) { |
Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 984 | ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); |
Pablo Neira Ayuso | bd07793 | 2013-08-07 18:13:20 +0200 | [diff] [blame] | 985 | if (ct && nfqa[NFQA_EXP]) { |
| 986 | nfqnl_attach_expect(ct, nfqa[NFQA_EXP], |
| 987 | NETLINK_CB(skb).portid, |
| 988 | nlmsg_report(nlh)); |
| 989 | } |
| 990 | } |
Pablo Neira Ayuso | 9cb0176 | 2012-06-07 12:13:39 +0200 | [diff] [blame] | 991 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 992 | if (nfqa[NFQA_PAYLOAD]) { |
Pablo Neira Ayuso | 8c88f87 | 2012-06-07 13:31:25 +0200 | [diff] [blame] | 993 | u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); |
| 994 | int diff = payload_len - entry->skb->len; |
| 995 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 996 | if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]), |
Pablo Neira Ayuso | 8c88f87 | 2012-06-07 13:31:25 +0200 | [diff] [blame] | 997 | payload_len, entry, diff) < 0) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 998 | verdict = NF_DROP; |
Pablo Neira Ayuso | 8c88f87 | 2012-06-07 13:31:25 +0200 | [diff] [blame] | 999 | |
Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 1000 | if (ct) |
Gao feng | 0a0d80e | 2013-09-17 13:03:47 +0200 | [diff] [blame] | 1001 | nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1002 | } |
| 1003 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1004 | if (nfqa[NFQA_MARK]) |
Patrick McHardy | ea3a66f | 2007-12-05 01:30:02 -0800 | [diff] [blame] | 1005 | entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK])); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1006 | |
Patrick McHardy | 4b3d15e | 2007-12-05 01:27:02 -0800 | [diff] [blame] | 1007 | nf_reinject(entry, verdict); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1008 | return 0; |
| 1009 | } |
| 1010 | |
| 1011 | static int |
| 1012 | nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 1013 | const struct nlmsghdr *nlh, |
| 1014 | const struct nlattr * const nfqa[]) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1015 | { |
| 1016 | return -ENOTSUPP; |
| 1017 | } |
| 1018 | |
Patrick McHardy | 5bf7585 | 2007-09-28 14:39:26 -0700 | [diff] [blame] | 1019 | static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = { |
| 1020 | [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) }, |
| 1021 | [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) }, |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1022 | }; |
| 1023 | |
Patrick McHardy | e3ac529 | 2007-12-05 01:23:57 -0800 | [diff] [blame] | 1024 | static const struct nf_queue_handler nfqh = { |
Harald Welte | bbd86b9f | 2005-08-09 20:23:11 -0700 | [diff] [blame] | 1025 | .outfn = &nfqnl_enqueue_packet, |
| 1026 | }; |
| 1027 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1028 | static int |
| 1029 | nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 1030 | const struct nlmsghdr *nlh, |
| 1031 | const struct nlattr * const nfqa[]) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1032 | { |
David S. Miller | 3da07c0 | 2012-06-26 21:35:27 -0700 | [diff] [blame] | 1033 | struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1034 | u_int16_t queue_num = ntohs(nfmsg->res_id); |
| 1035 | struct nfqnl_instance *queue; |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1036 | struct nfqnl_msg_config_cmd *cmd = NULL; |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1037 | struct net *net = sock_net(ctnl); |
| 1038 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1039 | int ret = 0; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1040 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1041 | if (nfqa[NFQA_CFG_CMD]) { |
| 1042 | cmd = nla_data(nfqa[NFQA_CFG_CMD]); |
| 1043 | |
Florian Westphal | 0360ae4 | 2012-11-23 06:22:21 +0000 | [diff] [blame] | 1044 | /* Obsolete commands without queue context */ |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1045 | switch (cmd->command) { |
Florian Westphal | 0360ae4 | 2012-11-23 06:22:21 +0000 | [diff] [blame] | 1046 | case NFQNL_CFG_CMD_PF_BIND: return 0; |
| 1047 | case NFQNL_CFG_CMD_PF_UNBIND: return 0; |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1048 | } |
Patrick McHardy | a3c8e7fd | 2007-12-05 01:28:30 -0800 | [diff] [blame] | 1049 | } |
| 1050 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1051 | rcu_read_lock(); |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1052 | queue = instance_lookup(q, queue_num); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1053 | if (queue && queue->peer_portid != NETLINK_CB(skb).portid) { |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1054 | ret = -EPERM; |
| 1055 | goto err_out_unlock; |
| 1056 | } |
Patrick McHardy | a3c8e7fd | 2007-12-05 01:28:30 -0800 | [diff] [blame] | 1057 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1058 | if (cmd != NULL) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1059 | switch (cmd->command) { |
| 1060 | case NFQNL_CFG_CMD_BIND: |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1061 | if (queue) { |
| 1062 | ret = -EBUSY; |
| 1063 | goto err_out_unlock; |
| 1064 | } |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1065 | queue = instance_create(q, queue_num, |
| 1066 | NETLINK_CB(skb).portid); |
Patrick McHardy | baab2ce | 2007-12-17 22:41:21 -0800 | [diff] [blame] | 1067 | if (IS_ERR(queue)) { |
| 1068 | ret = PTR_ERR(queue); |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1069 | goto err_out_unlock; |
| 1070 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1071 | break; |
| 1072 | case NFQNL_CFG_CMD_UNBIND: |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1073 | if (!queue) { |
| 1074 | ret = -ENODEV; |
| 1075 | goto err_out_unlock; |
| 1076 | } |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1077 | instance_destroy(q, queue); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1078 | break; |
| 1079 | case NFQNL_CFG_CMD_PF_BIND: |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1080 | case NFQNL_CFG_CMD_PF_UNBIND: |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1081 | break; |
| 1082 | default: |
Patrick McHardy | cd21f0a | 2007-12-17 22:40:19 -0800 | [diff] [blame] | 1083 | ret = -ENOTSUPP; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1084 | break; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1085 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1086 | } |
| 1087 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1088 | if (nfqa[NFQA_CFG_PARAMS]) { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1089 | struct nfqnl_msg_config_params *params; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1090 | |
Patrick McHardy | 406dbfc | 2006-03-12 20:32:47 -0800 | [diff] [blame] | 1091 | if (!queue) { |
Patrick McHardy | a3c8e7fd | 2007-12-05 01:28:30 -0800 | [diff] [blame] | 1092 | ret = -ENODEV; |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1093 | goto err_out_unlock; |
Patrick McHardy | 406dbfc | 2006-03-12 20:32:47 -0800 | [diff] [blame] | 1094 | } |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1095 | params = nla_data(nfqa[NFQA_CFG_PARAMS]); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1096 | nfqnl_set_mode(queue, params->copy_mode, |
| 1097 | ntohl(params->copy_range)); |
| 1098 | } |
| 1099 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1100 | if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) { |
Eric Leblond | 829e17a | 2006-11-29 02:35:33 +0100 | [diff] [blame] | 1101 | __be32 *queue_maxlen; |
Patrick McHardy | a3c8e7fd | 2007-12-05 01:28:30 -0800 | [diff] [blame] | 1102 | |
| 1103 | if (!queue) { |
| 1104 | ret = -ENODEV; |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1105 | goto err_out_unlock; |
Patrick McHardy | a3c8e7fd | 2007-12-05 01:28:30 -0800 | [diff] [blame] | 1106 | } |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1107 | queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]); |
Eric Leblond | 829e17a | 2006-11-29 02:35:33 +0100 | [diff] [blame] | 1108 | spin_lock_bh(&queue->lock); |
| 1109 | queue->queue_maxlen = ntohl(*queue_maxlen); |
| 1110 | spin_unlock_bh(&queue->lock); |
| 1111 | } |
| 1112 | |
Krishna Kumar | fdb694a | 2012-05-24 03:56:44 +0000 | [diff] [blame] | 1113 | if (nfqa[NFQA_CFG_FLAGS]) { |
| 1114 | __u32 flags, mask; |
| 1115 | |
| 1116 | if (!queue) { |
| 1117 | ret = -ENODEV; |
| 1118 | goto err_out_unlock; |
| 1119 | } |
| 1120 | |
| 1121 | if (!nfqa[NFQA_CFG_MASK]) { |
| 1122 | /* A mask is needed to specify which flags are being |
| 1123 | * changed. |
| 1124 | */ |
| 1125 | ret = -EINVAL; |
| 1126 | goto err_out_unlock; |
| 1127 | } |
| 1128 | |
| 1129 | flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS])); |
| 1130 | mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK])); |
| 1131 | |
Krishna Kumar | 46ba5a2 | 2012-06-27 00:59:56 +0000 | [diff] [blame] | 1132 | if (flags >= NFQA_CFG_F_MAX) { |
| 1133 | ret = -EOPNOTSUPP; |
| 1134 | goto err_out_unlock; |
| 1135 | } |
| 1136 | |
Krishna Kumar | fdb694a | 2012-05-24 03:56:44 +0000 | [diff] [blame] | 1137 | spin_lock_bh(&queue->lock); |
| 1138 | queue->flags &= ~mask; |
| 1139 | queue->flags |= flags & mask; |
| 1140 | spin_unlock_bh(&queue->lock); |
| 1141 | } |
| 1142 | |
Patrick McHardy | 9872bec | 2007-12-05 01:28:50 -0800 | [diff] [blame] | 1143 | err_out_unlock: |
| 1144 | rcu_read_unlock(); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1145 | return ret; |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1146 | } |
| 1147 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 1148 | static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = { |
Eric Dumazet | 84a797d | 2011-07-18 16:08:27 +0200 | [diff] [blame] | 1149 | [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp, |
Harald Welte | 37d2e7a | 2005-11-14 15:24:59 -0800 | [diff] [blame] | 1150 | .attr_count = NFQA_MAX, }, |
Eric Dumazet | 84a797d | 2011-07-18 16:08:27 +0200 | [diff] [blame] | 1151 | [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict, |
Patrick McHardy | 5bf7585 | 2007-09-28 14:39:26 -0700 | [diff] [blame] | 1152 | .attr_count = NFQA_MAX, |
| 1153 | .policy = nfqa_verdict_policy }, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1154 | [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config, |
Patrick McHardy | 5bf7585 | 2007-09-28 14:39:26 -0700 | [diff] [blame] | 1155 | .attr_count = NFQA_CFG_MAX, |
| 1156 | .policy = nfqa_cfg_policy }, |
Florian Westphal | 97d32cf | 2011-07-19 11:46:33 +0200 | [diff] [blame] | 1157 | [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch, |
| 1158 | .attr_count = NFQA_MAX, |
| 1159 | .policy = nfqa_verdict_batch_policy }, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1160 | }; |
| 1161 | |
Patrick McHardy | 7c8d4cb | 2007-09-28 14:15:45 -0700 | [diff] [blame] | 1162 | static const struct nfnetlink_subsystem nfqnl_subsys = { |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1163 | .name = "nf_queue", |
| 1164 | .subsys_id = NFNL_SUBSYS_QUEUE, |
| 1165 | .cb_count = NFQNL_MSG_MAX, |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1166 | .cb = nfqnl_cb, |
| 1167 | }; |
| 1168 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1169 | #ifdef CONFIG_PROC_FS |
| 1170 | struct iter_state { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1171 | struct seq_net_private p; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1172 | unsigned int bucket; |
| 1173 | }; |
| 1174 | |
| 1175 | static struct hlist_node *get_first(struct seq_file *seq) |
| 1176 | { |
| 1177 | struct iter_state *st = seq->private; |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1178 | struct net *net; |
| 1179 | struct nfnl_queue_net *q; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1180 | |
| 1181 | if (!st) |
| 1182 | return NULL; |
| 1183 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1184 | net = seq_file_net(seq); |
| 1185 | q = nfnl_queue_pernet(net); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1186 | for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1187 | if (!hlist_empty(&q->instance_table[st->bucket])) |
| 1188 | return q->instance_table[st->bucket].first; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1189 | } |
| 1190 | return NULL; |
| 1191 | } |
| 1192 | |
| 1193 | static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h) |
| 1194 | { |
| 1195 | struct iter_state *st = seq->private; |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1196 | struct net *net = seq_file_net(seq); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1197 | |
| 1198 | h = h->next; |
| 1199 | while (!h) { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1200 | struct nfnl_queue_net *q; |
| 1201 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1202 | if (++st->bucket >= INSTANCE_BUCKETS) |
| 1203 | return NULL; |
| 1204 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1205 | q = nfnl_queue_pernet(net); |
| 1206 | h = q->instance_table[st->bucket].first; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1207 | } |
| 1208 | return h; |
| 1209 | } |
| 1210 | |
| 1211 | static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos) |
| 1212 | { |
| 1213 | struct hlist_node *head; |
| 1214 | head = get_first(seq); |
| 1215 | |
| 1216 | if (head) |
| 1217 | while (pos && (head = get_next(seq, head))) |
| 1218 | pos--; |
| 1219 | return pos ? NULL : head; |
| 1220 | } |
| 1221 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1222 | static void *seq_start(struct seq_file *s, loff_t *pos) |
| 1223 | __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1224 | { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1225 | spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
| 1226 | return get_idx(s, *pos); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1227 | } |
| 1228 | |
| 1229 | static void *seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 1230 | { |
| 1231 | (*pos)++; |
| 1232 | return get_next(s, v); |
| 1233 | } |
| 1234 | |
| 1235 | static void seq_stop(struct seq_file *s, void *v) |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1236 | __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock) |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1237 | { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1238 | spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1239 | } |
| 1240 | |
| 1241 | static int seq_show(struct seq_file *s, void *v) |
| 1242 | { |
| 1243 | const struct nfqnl_instance *inst = v; |
| 1244 | |
| 1245 | return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n", |
| 1246 | inst->queue_num, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1247 | inst->peer_portid, inst->queue_total, |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1248 | inst->copy_mode, inst->copy_range, |
| 1249 | inst->queue_dropped, inst->queue_user_dropped, |
Eric Dumazet | 5863702 | 2011-07-19 11:44:17 +0200 | [diff] [blame] | 1250 | inst->id_sequence, 1); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1251 | } |
| 1252 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 1253 | static const struct seq_operations nfqnl_seq_ops = { |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1254 | .start = seq_start, |
| 1255 | .next = seq_next, |
| 1256 | .stop = seq_stop, |
| 1257 | .show = seq_show, |
| 1258 | }; |
| 1259 | |
| 1260 | static int nfqnl_open(struct inode *inode, struct file *file) |
| 1261 | { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1262 | return seq_open_net(inode, file, &nfqnl_seq_ops, |
Pavel Emelyanov | e2da591 | 2007-10-10 02:29:58 -0700 | [diff] [blame] | 1263 | sizeof(struct iter_state)); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1264 | } |
| 1265 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 1266 | static const struct file_operations nfqnl_file_ops = { |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1267 | .owner = THIS_MODULE, |
| 1268 | .open = nfqnl_open, |
| 1269 | .read = seq_read, |
| 1270 | .llseek = seq_lseek, |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1271 | .release = seq_release_net, |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1272 | }; |
| 1273 | |
| 1274 | #endif /* PROC_FS */ |
| 1275 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1276 | static int __net_init nfnl_queue_net_init(struct net *net) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1277 | { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1278 | unsigned int i; |
| 1279 | struct nfnl_queue_net *q = nfnl_queue_pernet(net); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1280 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1281 | for (i = 0; i < INSTANCE_BUCKETS; i++) |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1282 | INIT_HLIST_HEAD(&q->instance_table[i]); |
| 1283 | |
| 1284 | spin_lock_init(&q->instances_lock); |
| 1285 | |
| 1286 | #ifdef CONFIG_PROC_FS |
| 1287 | if (!proc_create("nfnetlink_queue", 0440, |
| 1288 | net->nf.proc_netfilter, &nfqnl_file_ops)) |
| 1289 | return -ENOMEM; |
| 1290 | #endif |
| 1291 | return 0; |
| 1292 | } |
| 1293 | |
| 1294 | static void __net_exit nfnl_queue_net_exit(struct net *net) |
| 1295 | { |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 1296 | #ifdef CONFIG_PROC_FS |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1297 | remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter); |
Pablo Neira Ayuso | e778f56 | 2013-04-30 08:01:18 +0000 | [diff] [blame] | 1298 | #endif |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1299 | } |
| 1300 | |
| 1301 | static struct pernet_operations nfnl_queue_net_ops = { |
| 1302 | .init = nfnl_queue_net_init, |
| 1303 | .exit = nfnl_queue_net_exit, |
| 1304 | .id = &nfnl_queue_net_id, |
| 1305 | .size = sizeof(struct nfnl_queue_net), |
| 1306 | }; |
| 1307 | |
| 1308 | static int __init nfnetlink_queue_init(void) |
| 1309 | { |
| 1310 | int status = -ENOMEM; |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1311 | |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1312 | netlink_register_notifier(&nfqnl_rtnl_notifier); |
| 1313 | status = nfnetlink_subsys_register(&nfqnl_subsys); |
| 1314 | if (status < 0) { |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1315 | pr_err("nf_queue: failed to create netlink socket\n"); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1316 | goto cleanup_netlink_notifier; |
| 1317 | } |
| 1318 | |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1319 | status = register_pernet_subsys(&nfnl_queue_net_ops); |
| 1320 | if (status < 0) { |
| 1321 | pr_err("nf_queue: failed to register pernet ops\n"); |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1322 | goto cleanup_subsys; |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1323 | } |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1324 | register_netdevice_notifier(&nfqnl_dev_notifier); |
Florian Westphal | 0360ae4 | 2012-11-23 06:22:21 +0000 | [diff] [blame] | 1325 | nf_register_queue_handler(&nfqh); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1326 | return status; |
| 1327 | |
Harald Welte | 838ab63 | 2005-08-09 19:50:45 -0700 | [diff] [blame] | 1328 | cleanup_subsys: |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1329 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1330 | cleanup_netlink_notifier: |
| 1331 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); |
| 1332 | return status; |
| 1333 | } |
| 1334 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1335 | static void __exit nfnetlink_queue_fini(void) |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1336 | { |
Florian Westphal | 0360ae4 | 2012-11-23 06:22:21 +0000 | [diff] [blame] | 1337 | nf_unregister_queue_handler(); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 1338 | unregister_netdevice_notifier(&nfqnl_dev_notifier); |
Gao feng | e817961 | 2013-03-24 23:50:47 +0000 | [diff] [blame] | 1339 | unregister_pernet_subsys(&nfnl_queue_net_ops); |
Patrick McHardy | 32292a7 | 2006-04-06 14:11:30 -0700 | [diff] [blame] | 1340 | nfnetlink_subsys_unregister(&nfqnl_subsys); |
| 1341 | netlink_unregister_notifier(&nfqnl_rtnl_notifier); |
Jesper Dangaard Brouer | 67137f3 | 2009-06-08 03:11:33 +0000 | [diff] [blame] | 1342 | |
| 1343 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
Harald Welte | 7af4cc3 | 2005-08-09 19:44:15 -0700 | [diff] [blame] | 1344 | } |
| 1345 | |
| 1346 | MODULE_DESCRIPTION("netfilter packet queue handler"); |
| 1347 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
| 1348 | MODULE_LICENSE("GPL"); |
| 1349 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE); |
| 1350 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1351 | module_init(nfnetlink_queue_init); |
| 1352 | module_exit(nfnetlink_queue_fini); |