Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 1 | /* |
| 2 | * xt_hashlimit - Netfilter module to limit the number of packets per time |
Daniel Mack | 3ad2f3fb | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 3 | * separately for each hashbucket (sourceip/sourceport/dstip/dstport) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 4 | * |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 5 | * (C) 2003-2004 by Harald Welte <laforge@netfilter.org> |
| 6 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 7 | * |
| 8 | * Development of this code was funded by Astaro AG, http://www.astaro.com/ |
| 9 | */ |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame] | 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 11 | #include <linux/module.h> |
| 12 | #include <linux/spinlock.h> |
| 13 | #include <linux/random.h> |
| 14 | #include <linux/jhash.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/vmalloc.h> |
| 17 | #include <linux/proc_fs.h> |
| 18 | #include <linux/seq_file.h> |
| 19 | #include <linux/list.h> |
| 20 | #include <linux/skbuff.h> |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 21 | #include <linux/mm.h> |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 22 | #include <linux/in.h> |
| 23 | #include <linux/ip.h> |
Eric Dumazet | 7b21e09 | 2007-12-17 22:45:28 -0800 | [diff] [blame] | 24 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 25 | #include <linux/ipv6.h> |
Patrick McHardy | 193b23c | 2007-12-04 23:51:48 -0800 | [diff] [blame] | 26 | #include <net/ipv6.h> |
Eric Dumazet | 7b21e09 | 2007-12-17 22:45:28 -0800 | [diff] [blame] | 27 | #endif |
| 28 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 29 | #include <net/net_namespace.h> |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 30 | #include <net/netns/generic.h> |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 31 | |
| 32 | #include <linux/netfilter/x_tables.h> |
| 33 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 34 | #include <linux/netfilter_ipv6/ip6_tables.h> |
| 35 | #include <linux/netfilter/xt_hashlimit.h> |
| 36 | #include <linux/mutex.h> |
| 37 | |
| 38 | MODULE_LICENSE("GPL"); |
| 39 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
Jan Engelhardt | 408ffaa | 2010-02-28 23:19:52 +0100 | [diff] [blame] | 40 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 41 | MODULE_DESCRIPTION("Xtables: per hash-bucket rate-limit match"); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 42 | MODULE_ALIAS("ipt_hashlimit"); |
| 43 | MODULE_ALIAS("ip6t_hashlimit"); |
| 44 | |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 45 | struct hashlimit_net { |
| 46 | struct hlist_head htables; |
| 47 | struct proc_dir_entry *ipt_hashlimit; |
| 48 | struct proc_dir_entry *ip6t_hashlimit; |
| 49 | }; |
| 50 | |
| 51 | static int hashlimit_net_id; |
| 52 | static inline struct hashlimit_net *hashlimit_pernet(struct net *net) |
| 53 | { |
| 54 | return net_generic(net, hashlimit_net_id); |
| 55 | } |
| 56 | |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 57 | /* need to declare this at the top */ |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 58 | static const struct file_operations dl_file_ops; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 59 | |
| 60 | /* hash table crap */ |
| 61 | struct dsthash_dst { |
| 62 | union { |
| 63 | struct { |
| 64 | __be32 src; |
| 65 | __be32 dst; |
| 66 | } ip; |
Eric Dumazet | 7b21e09 | 2007-12-17 22:45:28 -0800 | [diff] [blame] | 67 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 68 | struct { |
| 69 | __be32 src[4]; |
| 70 | __be32 dst[4]; |
| 71 | } ip6; |
Eric Dumazet | 7b21e09 | 2007-12-17 22:45:28 -0800 | [diff] [blame] | 72 | #endif |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 73 | }; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 74 | __be16 src_port; |
| 75 | __be16 dst_port; |
| 76 | }; |
| 77 | |
| 78 | struct dsthash_ent { |
| 79 | /* static / read-only parts in the beginning */ |
| 80 | struct hlist_node node; |
| 81 | struct dsthash_dst dst; |
| 82 | |
| 83 | /* modified structure members in the end */ |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 84 | spinlock_t lock; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 85 | unsigned long expires; /* precalculated expiry time */ |
| 86 | struct { |
| 87 | unsigned long prev; /* last modification */ |
| 88 | u_int32_t credit; |
| 89 | u_int32_t credit_cap, cost; |
| 90 | } rateinfo; |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 91 | struct rcu_head rcu; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 92 | }; |
| 93 | |
| 94 | struct xt_hashlimit_htable { |
| 95 | struct hlist_node node; /* global list of all htables */ |
Patrick McHardy | 2eff25c | 2010-02-03 13:24:54 +0100 | [diff] [blame] | 96 | int use; |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 97 | u_int8_t family; |
Jan Engelhardt | 89bc7a0 | 2010-01-04 16:26:03 +0100 | [diff] [blame] | 98 | bool rnd_initialized; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 99 | |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 100 | struct hashlimit_cfg1 cfg; /* config */ |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 101 | |
| 102 | /* used internally */ |
| 103 | spinlock_t lock; /* lock for list_head */ |
| 104 | u_int32_t rnd; /* random seed for hash */ |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 105 | unsigned int count; /* number entries in table */ |
| 106 | struct timer_list timer; /* timer for gc */ |
| 107 | |
| 108 | /* seq_file stuff */ |
| 109 | struct proc_dir_entry *pde; |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 110 | struct net *net; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 111 | |
| 112 | struct hlist_head hash[0]; /* hashtable itself */ |
| 113 | }; |
| 114 | |
Patrick McHardy | 2eff25c | 2010-02-03 13:24:54 +0100 | [diff] [blame] | 115 | static DEFINE_MUTEX(hashlimit_mutex); /* protects htables list */ |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 116 | static struct kmem_cache *hashlimit_cachep __read_mostly; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 117 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 118 | static inline bool dst_cmp(const struct dsthash_ent *ent, |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 119 | const struct dsthash_dst *b) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 120 | { |
| 121 | return !memcmp(&ent->dst, b, sizeof(ent->dst)); |
| 122 | } |
| 123 | |
| 124 | static u_int32_t |
| 125 | hash_dst(const struct xt_hashlimit_htable *ht, const struct dsthash_dst *dst) |
| 126 | { |
Eric Dumazet | e2f82ac | 2007-12-17 22:45:13 -0800 | [diff] [blame] | 127 | u_int32_t hash = jhash2((const u32 *)dst, |
| 128 | sizeof(*dst)/sizeof(u32), |
| 129 | ht->rnd); |
| 130 | /* |
| 131 | * Instead of returning hash % ht->cfg.size (implying a divide) |
| 132 | * we return the high 32 bits of the (hash * ht->cfg.size) that will |
| 133 | * give results between [0 and cfg.size-1] and same hash distribution, |
| 134 | * but using a multiply, less expensive than a divide |
| 135 | */ |
| 136 | return ((u64)hash * ht->cfg.size) >> 32; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | static struct dsthash_ent * |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 140 | dsthash_find(const struct xt_hashlimit_htable *ht, |
| 141 | const struct dsthash_dst *dst) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 142 | { |
| 143 | struct dsthash_ent *ent; |
| 144 | struct hlist_node *pos; |
| 145 | u_int32_t hash = hash_dst(ht, dst); |
| 146 | |
| 147 | if (!hlist_empty(&ht->hash[hash])) { |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 148 | hlist_for_each_entry_rcu(ent, pos, &ht->hash[hash], node) |
| 149 | if (dst_cmp(ent, dst)) { |
| 150 | spin_lock(&ent->lock); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 151 | return ent; |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 152 | } |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 153 | } |
| 154 | return NULL; |
| 155 | } |
| 156 | |
| 157 | /* allocate dsthash_ent, initialize dst, put in htable and lock it */ |
| 158 | static struct dsthash_ent * |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 159 | dsthash_alloc_init(struct xt_hashlimit_htable *ht, |
| 160 | const struct dsthash_dst *dst) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 161 | { |
| 162 | struct dsthash_ent *ent; |
| 163 | |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 164 | spin_lock(&ht->lock); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 165 | /* initialize hash with random val at the time we allocate |
| 166 | * the first hashtable entry */ |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 167 | if (unlikely(!ht->rnd_initialized)) { |
Hagen Paul Pfeifer | af07d24 | 2009-02-20 10:48:06 +0100 | [diff] [blame] | 168 | get_random_bytes(&ht->rnd, sizeof(ht->rnd)); |
Jan Engelhardt | 89bc7a0 | 2010-01-04 16:26:03 +0100 | [diff] [blame] | 169 | ht->rnd_initialized = true; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | if (ht->cfg.max && ht->count >= ht->cfg.max) { |
| 173 | /* FIXME: do something. question is what.. */ |
| 174 | if (net_ratelimit()) |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame] | 175 | pr_err("max count of %u reached\n", ht->cfg.max); |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 176 | ent = NULL; |
| 177 | } else |
| 178 | ent = kmem_cache_alloc(hashlimit_cachep, GFP_ATOMIC); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 179 | if (!ent) { |
| 180 | if (net_ratelimit()) |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame] | 181 | pr_err("cannot allocate dsthash_ent\n"); |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 182 | } else { |
| 183 | memcpy(&ent->dst, dst, sizeof(ent->dst)); |
| 184 | spin_lock_init(&ent->lock); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 185 | |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 186 | spin_lock(&ent->lock); |
| 187 | hlist_add_head_rcu(&ent->node, &ht->hash[hash_dst(ht, dst)]); |
| 188 | ht->count++; |
| 189 | } |
| 190 | spin_unlock(&ht->lock); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 191 | return ent; |
| 192 | } |
| 193 | |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 194 | static void dsthash_free_rcu(struct rcu_head *head) |
| 195 | { |
| 196 | struct dsthash_ent *ent = container_of(head, struct dsthash_ent, rcu); |
| 197 | |
| 198 | kmem_cache_free(hashlimit_cachep, ent); |
| 199 | } |
| 200 | |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 201 | static inline void |
| 202 | dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent) |
| 203 | { |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 204 | hlist_del_rcu(&ent->node); |
| 205 | call_rcu_bh(&ent->rcu, dsthash_free_rcu); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 206 | ht->count--; |
| 207 | } |
| 208 | static void htable_gc(unsigned long htlong); |
| 209 | |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 210 | static int htable_create(struct net *net, struct xt_hashlimit_mtinfo1 *minfo, |
| 211 | u_int8_t family) |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 212 | { |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 213 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 214 | struct xt_hashlimit_htable *hinfo; |
| 215 | unsigned int size; |
| 216 | unsigned int i; |
| 217 | |
| 218 | if (minfo->cfg.size) { |
| 219 | size = minfo->cfg.size; |
| 220 | } else { |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 221 | size = (totalram_pages << PAGE_SHIFT) / 16384 / |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 222 | sizeof(struct list_head); |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 223 | if (totalram_pages > 1024 * 1024 * 1024 / PAGE_SIZE) |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 224 | size = 8192; |
| 225 | if (size < 16) |
| 226 | size = 16; |
| 227 | } |
| 228 | /* FIXME: don't use vmalloc() here or anywhere else -HW */ |
| 229 | hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) + |
| 230 | sizeof(struct list_head) * size); |
Jan Engelhardt | 85bc3f3 | 2010-03-18 00:27:03 +0100 | [diff] [blame] | 231 | if (hinfo == NULL) |
Jan Engelhardt | 4a5a5c7 | 2010-03-19 17:32:59 +0100 | [diff] [blame] | 232 | return -ENOMEM; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 233 | minfo->hinfo = hinfo; |
| 234 | |
| 235 | /* copy match config into hashtable config */ |
| 236 | memcpy(&hinfo->cfg, &minfo->cfg, sizeof(hinfo->cfg)); |
| 237 | hinfo->cfg.size = size; |
| 238 | if (hinfo->cfg.max == 0) |
| 239 | hinfo->cfg.max = 8 * hinfo->cfg.size; |
| 240 | else if (hinfo->cfg.max < hinfo->cfg.size) |
| 241 | hinfo->cfg.max = hinfo->cfg.size; |
| 242 | |
| 243 | for (i = 0; i < hinfo->cfg.size; i++) |
| 244 | INIT_HLIST_HEAD(&hinfo->hash[i]); |
| 245 | |
Patrick McHardy | 2eff25c | 2010-02-03 13:24:54 +0100 | [diff] [blame] | 246 | hinfo->use = 1; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 247 | hinfo->count = 0; |
| 248 | hinfo->family = family; |
Jan Engelhardt | 89bc7a0 | 2010-01-04 16:26:03 +0100 | [diff] [blame] | 249 | hinfo->rnd_initialized = false; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 250 | spin_lock_init(&hinfo->lock); |
| 251 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 252 | hinfo->pde = proc_create_data(minfo->name, 0, |
| 253 | (family == NFPROTO_IPV4) ? |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 254 | hashlimit_net->ipt_hashlimit : hashlimit_net->ip6t_hashlimit, |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 255 | &dl_file_ops, hinfo); |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 256 | if (hinfo->pde == NULL) { |
| 257 | vfree(hinfo); |
Jan Engelhardt | 4a5a5c7 | 2010-03-19 17:32:59 +0100 | [diff] [blame] | 258 | return -ENOMEM; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 259 | } |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 260 | hinfo->net = net; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 261 | |
| 262 | setup_timer(&hinfo->timer, htable_gc, (unsigned long)hinfo); |
| 263 | hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval); |
| 264 | add_timer(&hinfo->timer); |
| 265 | |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 266 | hlist_add_head(&hinfo->node, &hashlimit_net->htables); |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 267 | |
| 268 | return 0; |
| 269 | } |
| 270 | |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 271 | static bool select_all(const struct xt_hashlimit_htable *ht, |
| 272 | const struct dsthash_ent *he) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 273 | { |
| 274 | return 1; |
| 275 | } |
| 276 | |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 277 | static bool select_gc(const struct xt_hashlimit_htable *ht, |
| 278 | const struct dsthash_ent *he) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 279 | { |
Eric Dumazet | cbebc51 | 2007-12-12 11:11:28 -0800 | [diff] [blame] | 280 | return time_after_eq(jiffies, he->expires); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | static void htable_selective_cleanup(struct xt_hashlimit_htable *ht, |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 284 | bool (*select)(const struct xt_hashlimit_htable *ht, |
| 285 | const struct dsthash_ent *he)) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 286 | { |
| 287 | unsigned int i; |
| 288 | |
| 289 | /* lock hash table and iterate over it */ |
| 290 | spin_lock_bh(&ht->lock); |
| 291 | for (i = 0; i < ht->cfg.size; i++) { |
| 292 | struct dsthash_ent *dh; |
| 293 | struct hlist_node *pos, *n; |
| 294 | hlist_for_each_entry_safe(dh, pos, n, &ht->hash[i], node) { |
| 295 | if ((*select)(ht, dh)) |
| 296 | dsthash_free(ht, dh); |
| 297 | } |
| 298 | } |
| 299 | spin_unlock_bh(&ht->lock); |
| 300 | } |
| 301 | |
| 302 | /* hash table garbage collector, run by timer */ |
| 303 | static void htable_gc(unsigned long htlong) |
| 304 | { |
| 305 | struct xt_hashlimit_htable *ht = (struct xt_hashlimit_htable *)htlong; |
| 306 | |
| 307 | htable_selective_cleanup(ht, select_gc); |
| 308 | |
| 309 | /* re-add the timer accordingly */ |
| 310 | ht->timer.expires = jiffies + msecs_to_jiffies(ht->cfg.gc_interval); |
| 311 | add_timer(&ht->timer); |
| 312 | } |
| 313 | |
| 314 | static void htable_destroy(struct xt_hashlimit_htable *hinfo) |
| 315 | { |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 316 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(hinfo->net); |
| 317 | struct proc_dir_entry *parent; |
| 318 | |
Pavel Emelyanov | 967ab99 | 2008-07-31 00:38:52 -0700 | [diff] [blame] | 319 | del_timer_sync(&hinfo->timer); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 320 | |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 321 | if (hinfo->family == NFPROTO_IPV4) |
| 322 | parent = hashlimit_net->ipt_hashlimit; |
| 323 | else |
| 324 | parent = hashlimit_net->ip6t_hashlimit; |
| 325 | remove_proc_entry(hinfo->pde->name, parent); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 326 | htable_selective_cleanup(hinfo, select_all); |
| 327 | vfree(hinfo); |
| 328 | } |
| 329 | |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 330 | static struct xt_hashlimit_htable *htable_find_get(struct net *net, |
| 331 | const char *name, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 332 | u_int8_t family) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 333 | { |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 334 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 335 | struct xt_hashlimit_htable *hinfo; |
| 336 | struct hlist_node *pos; |
| 337 | |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 338 | hlist_for_each_entry(hinfo, pos, &hashlimit_net->htables, node) { |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 339 | if (!strcmp(name, hinfo->pde->name) && |
| 340 | hinfo->family == family) { |
Patrick McHardy | 2eff25c | 2010-02-03 13:24:54 +0100 | [diff] [blame] | 341 | hinfo->use++; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 342 | return hinfo; |
| 343 | } |
| 344 | } |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 345 | return NULL; |
| 346 | } |
| 347 | |
| 348 | static void htable_put(struct xt_hashlimit_htable *hinfo) |
| 349 | { |
Patrick McHardy | 2eff25c | 2010-02-03 13:24:54 +0100 | [diff] [blame] | 350 | mutex_lock(&hashlimit_mutex); |
| 351 | if (--hinfo->use == 0) { |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 352 | hlist_del(&hinfo->node); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 353 | htable_destroy(hinfo); |
| 354 | } |
Patrick McHardy | 2eff25c | 2010-02-03 13:24:54 +0100 | [diff] [blame] | 355 | mutex_unlock(&hashlimit_mutex); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | /* The algorithm used is the Simple Token Bucket Filter (TBF) |
| 359 | * see net/sched/sch_tbf.c in the linux source tree |
| 360 | */ |
| 361 | |
| 362 | /* Rusty: This is my (non-mathematically-inclined) understanding of |
| 363 | this algorithm. The `average rate' in jiffies becomes your initial |
| 364 | amount of credit `credit' and the most credit you can ever have |
| 365 | `credit_cap'. The `peak rate' becomes the cost of passing the |
| 366 | test, `cost'. |
| 367 | |
| 368 | `prev' tracks the last packet hit: you gain one credit per jiffy. |
| 369 | If you get credit balance more than this, the extra credit is |
| 370 | discarded. Every time the match passes, you lose `cost' credits; |
| 371 | if you don't have that many, the test fails. |
| 372 | |
| 373 | See Alexey's formal explanation in net/sched/sch_tbf.c. |
| 374 | |
| 375 | To get the maximum range, we multiply by this factor (ie. you get N |
| 376 | credits per jiffy). We want to allow a rate as low as 1 per day |
| 377 | (slowest userspace tool allows), which means |
| 378 | CREDITS_PER_JIFFY*HZ*60*60*24 < 2^32 ie. |
| 379 | */ |
| 380 | #define MAX_CPJ (0xFFFFFFFF / (HZ*60*60*24)) |
| 381 | |
| 382 | /* Repeated shift and or gives us all 1s, final shift and add 1 gives |
| 383 | * us the power of 2 below the theoretical max, so GCC simply does a |
| 384 | * shift. */ |
| 385 | #define _POW2_BELOW2(x) ((x)|((x)>>1)) |
| 386 | #define _POW2_BELOW4(x) (_POW2_BELOW2(x)|_POW2_BELOW2((x)>>2)) |
| 387 | #define _POW2_BELOW8(x) (_POW2_BELOW4(x)|_POW2_BELOW4((x)>>4)) |
| 388 | #define _POW2_BELOW16(x) (_POW2_BELOW8(x)|_POW2_BELOW8((x)>>8)) |
| 389 | #define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16)) |
| 390 | #define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1) |
| 391 | |
| 392 | #define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ) |
| 393 | |
| 394 | /* Precision saver. */ |
| 395 | static inline u_int32_t |
| 396 | user2credits(u_int32_t user) |
| 397 | { |
| 398 | /* If multiplying would overflow... */ |
| 399 | if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY)) |
| 400 | /* Divide first. */ |
| 401 | return (user / XT_HASHLIMIT_SCALE) * HZ * CREDITS_PER_JIFFY; |
| 402 | |
| 403 | return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE; |
| 404 | } |
| 405 | |
| 406 | static inline void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now) |
| 407 | { |
| 408 | dh->rateinfo.credit += (now - dh->rateinfo.prev) * CREDITS_PER_JIFFY; |
| 409 | if (dh->rateinfo.credit > dh->rateinfo.credit_cap) |
| 410 | dh->rateinfo.credit = dh->rateinfo.credit_cap; |
| 411 | dh->rateinfo.prev = now; |
| 412 | } |
| 413 | |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 414 | static inline __be32 maskl(__be32 a, unsigned int l) |
| 415 | { |
Patrick McHardy | 1b9b70e | 2008-04-09 15:14:18 -0700 | [diff] [blame] | 416 | return l ? htonl(ntohl(a) & ~0 << (32 - l)) : 0; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 417 | } |
| 418 | |
Pavel Emelyanov | 3ed5df4 | 2008-01-31 18:42:26 -0800 | [diff] [blame] | 419 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 420 | static void hashlimit_ipv6_mask(__be32 *i, unsigned int p) |
| 421 | { |
| 422 | switch (p) { |
Patrick McHardy | 1b9b70e | 2008-04-09 15:14:18 -0700 | [diff] [blame] | 423 | case 0 ... 31: |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 424 | i[0] = maskl(i[0], p); |
| 425 | i[1] = i[2] = i[3] = 0; |
| 426 | break; |
Patrick McHardy | 1b9b70e | 2008-04-09 15:14:18 -0700 | [diff] [blame] | 427 | case 32 ... 63: |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 428 | i[1] = maskl(i[1], p - 32); |
| 429 | i[2] = i[3] = 0; |
| 430 | break; |
Patrick McHardy | 1b9b70e | 2008-04-09 15:14:18 -0700 | [diff] [blame] | 431 | case 64 ... 95: |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 432 | i[2] = maskl(i[2], p - 64); |
| 433 | i[3] = 0; |
Eric Dumazet | 8f59922 | 2010-03-25 17:25:11 +0100 | [diff] [blame] | 434 | break; |
Patrick McHardy | 1b9b70e | 2008-04-09 15:14:18 -0700 | [diff] [blame] | 435 | case 96 ... 127: |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 436 | i[3] = maskl(i[3], p - 96); |
| 437 | break; |
| 438 | case 128: |
| 439 | break; |
| 440 | } |
| 441 | } |
Pavel Emelyanov | 3ed5df4 | 2008-01-31 18:42:26 -0800 | [diff] [blame] | 442 | #endif |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 443 | |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 444 | static int |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 445 | hashlimit_init_dst(const struct xt_hashlimit_htable *hinfo, |
| 446 | struct dsthash_dst *dst, |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 447 | const struct sk_buff *skb, unsigned int protoff) |
| 448 | { |
| 449 | __be16 _ports[2], *ports; |
Patrick McHardy | 193b23c | 2007-12-04 23:51:48 -0800 | [diff] [blame] | 450 | u8 nexthdr; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 451 | |
| 452 | memset(dst, 0, sizeof(*dst)); |
| 453 | |
| 454 | switch (hinfo->family) { |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 455 | case NFPROTO_IPV4: |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 456 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP) |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 457 | dst->ip.dst = maskl(ip_hdr(skb)->daddr, |
| 458 | hinfo->cfg.dstmask); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 459 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP) |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 460 | dst->ip.src = maskl(ip_hdr(skb)->saddr, |
| 461 | hinfo->cfg.srcmask); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 462 | |
| 463 | if (!(hinfo->cfg.mode & |
| 464 | (XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT))) |
| 465 | return 0; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 466 | nexthdr = ip_hdr(skb)->protocol; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 467 | break; |
Yasuyuki Kozakai | 02dba02 | 2006-12-02 22:19:01 -0800 | [diff] [blame] | 468 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 469 | case NFPROTO_IPV6: |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 470 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP) { |
| 471 | memcpy(&dst->ip6.dst, &ipv6_hdr(skb)->daddr, |
| 472 | sizeof(dst->ip6.dst)); |
| 473 | hashlimit_ipv6_mask(dst->ip6.dst, hinfo->cfg.dstmask); |
| 474 | } |
| 475 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP) { |
| 476 | memcpy(&dst->ip6.src, &ipv6_hdr(skb)->saddr, |
| 477 | sizeof(dst->ip6.src)); |
| 478 | hashlimit_ipv6_mask(dst->ip6.src, hinfo->cfg.srcmask); |
| 479 | } |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 480 | |
| 481 | if (!(hinfo->cfg.mode & |
| 482 | (XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT))) |
| 483 | return 0; |
Patrick McHardy | 193b23c | 2007-12-04 23:51:48 -0800 | [diff] [blame] | 484 | nexthdr = ipv6_hdr(skb)->nexthdr; |
| 485 | protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); |
| 486 | if ((int)protoff < 0) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 487 | return -1; |
| 488 | break; |
| 489 | #endif |
| 490 | default: |
| 491 | BUG(); |
| 492 | return 0; |
| 493 | } |
| 494 | |
| 495 | switch (nexthdr) { |
| 496 | case IPPROTO_TCP: |
| 497 | case IPPROTO_UDP: |
Patrick McHardy | a8d0f95 | 2007-02-07 15:07:43 -0800 | [diff] [blame] | 498 | case IPPROTO_UDPLITE: |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 499 | case IPPROTO_SCTP: |
| 500 | case IPPROTO_DCCP: |
| 501 | ports = skb_header_pointer(skb, protoff, sizeof(_ports), |
| 502 | &_ports); |
| 503 | break; |
| 504 | default: |
| 505 | _ports[0] = _ports[1] = 0; |
| 506 | ports = _ports; |
| 507 | break; |
| 508 | } |
| 509 | if (!ports) |
| 510 | return -1; |
| 511 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SPT) |
| 512 | dst->src_port = ports[0]; |
| 513 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DPT) |
| 514 | dst->dst_port = ports[1]; |
| 515 | return 0; |
| 516 | } |
| 517 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 518 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 519 | hashlimit_mt(const struct sk_buff *skb, struct xt_action_param *par) |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 520 | { |
Jan Engelhardt | f7108a20 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 521 | const struct xt_hashlimit_mtinfo1 *info = par->matchinfo; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 522 | struct xt_hashlimit_htable *hinfo = info->hinfo; |
| 523 | unsigned long now = jiffies; |
| 524 | struct dsthash_ent *dh; |
| 525 | struct dsthash_dst dst; |
| 526 | |
Jan Engelhardt | f7108a20 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 527 | if (hashlimit_init_dst(hinfo, &dst, skb, par->thoff) < 0) |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 528 | goto hotdrop; |
| 529 | |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 530 | rcu_read_lock_bh(); |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 531 | dh = dsthash_find(hinfo, &dst); |
| 532 | if (dh == NULL) { |
| 533 | dh = dsthash_alloc_init(hinfo, &dst); |
| 534 | if (dh == NULL) { |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 535 | rcu_read_unlock_bh(); |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 536 | goto hotdrop; |
| 537 | } |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 538 | dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire); |
| 539 | dh->rateinfo.prev = jiffies; |
| 540 | dh->rateinfo.credit = user2credits(hinfo->cfg.avg * |
| 541 | hinfo->cfg.burst); |
| 542 | dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg * |
| 543 | hinfo->cfg.burst); |
| 544 | dh->rateinfo.cost = user2credits(hinfo->cfg.avg); |
| 545 | } else { |
| 546 | /* update expiration timeout */ |
| 547 | dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire); |
| 548 | rateinfo_recalc(dh, now); |
| 549 | } |
| 550 | |
| 551 | if (dh->rateinfo.credit >= dh->rateinfo.cost) { |
| 552 | /* below the limit */ |
| 553 | dh->rateinfo.credit -= dh->rateinfo.cost; |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 554 | spin_unlock(&dh->lock); |
| 555 | rcu_read_unlock_bh(); |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 556 | return !(info->cfg.mode & XT_HASHLIMIT_INVERT); |
| 557 | } |
| 558 | |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 559 | spin_unlock(&dh->lock); |
| 560 | rcu_read_unlock_bh(); |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 561 | /* default match is underlimit - so over the limit, we need to invert */ |
| 562 | return info->cfg.mode & XT_HASHLIMIT_INVERT; |
| 563 | |
| 564 | hotdrop: |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 565 | par->hotdrop = true; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 566 | return false; |
| 567 | } |
| 568 | |
Jan Engelhardt | b0f3845 | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 569 | static int hashlimit_mt_check(const struct xt_mtchk_param *par) |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 570 | { |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 571 | struct net *net = par->net; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 572 | struct xt_hashlimit_mtinfo1 *info = par->matchinfo; |
Jan Engelhardt | 4a5a5c7 | 2010-03-19 17:32:59 +0100 | [diff] [blame] | 573 | int ret; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 574 | |
| 575 | /* Check for overflow. */ |
| 576 | if (info->cfg.burst == 0 || |
| 577 | user2credits(info->cfg.avg * info->cfg.burst) < |
| 578 | user2credits(info->cfg.avg)) { |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame] | 579 | pr_info("overflow, try lower: %u/%u\n", |
| 580 | info->cfg.avg, info->cfg.burst); |
Jan Engelhardt | 4a5a5c7 | 2010-03-19 17:32:59 +0100 | [diff] [blame] | 581 | return -ERANGE; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 582 | } |
| 583 | if (info->cfg.gc_interval == 0 || info->cfg.expire == 0) |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 584 | return -EINVAL; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 585 | if (info->name[sizeof(info->name)-1] != '\0') |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 586 | return -EINVAL; |
Jan Engelhardt | aa5fa31 | 2010-03-18 00:44:52 +0100 | [diff] [blame] | 587 | if (par->family == NFPROTO_IPV4) { |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 588 | if (info->cfg.srcmask > 32 || info->cfg.dstmask > 32) |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 589 | return -EINVAL; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 590 | } else { |
| 591 | if (info->cfg.srcmask > 128 || info->cfg.dstmask > 128) |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 592 | return -EINVAL; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 593 | } |
| 594 | |
Patrick McHardy | 2eff25c | 2010-02-03 13:24:54 +0100 | [diff] [blame] | 595 | mutex_lock(&hashlimit_mutex); |
Jan Engelhardt | aa5fa31 | 2010-03-18 00:44:52 +0100 | [diff] [blame] | 596 | info->hinfo = htable_find_get(net, info->name, par->family); |
Jan Engelhardt | 4a5a5c7 | 2010-03-19 17:32:59 +0100 | [diff] [blame] | 597 | if (info->hinfo == NULL) { |
| 598 | ret = htable_create(net, info, par->family); |
| 599 | if (ret < 0) { |
| 600 | mutex_unlock(&hashlimit_mutex); |
| 601 | return ret; |
| 602 | } |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 603 | } |
Patrick McHardy | 2eff25c | 2010-02-03 13:24:54 +0100 | [diff] [blame] | 604 | mutex_unlock(&hashlimit_mutex); |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 605 | return 0; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 606 | } |
| 607 | |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 608 | static void hashlimit_mt_destroy(const struct xt_mtdtor_param *par) |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 609 | { |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 610 | const struct xt_hashlimit_mtinfo1 *info = par->matchinfo; |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 611 | |
| 612 | htable_put(info->hinfo); |
| 613 | } |
| 614 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 615 | static struct xt_match hashlimit_mt_reg[] __read_mostly = { |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 616 | { |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 617 | .name = "hashlimit", |
| 618 | .revision = 1, |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 619 | .family = NFPROTO_IPV4, |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 620 | .match = hashlimit_mt, |
| 621 | .matchsize = sizeof(struct xt_hashlimit_mtinfo1), |
| 622 | .checkentry = hashlimit_mt_check, |
| 623 | .destroy = hashlimit_mt_destroy, |
| 624 | .me = THIS_MODULE, |
| 625 | }, |
Eric Dumazet | 7b21e09 | 2007-12-17 22:45:28 -0800 | [diff] [blame] | 626 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 627 | { |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 628 | .name = "hashlimit", |
| 629 | .revision = 1, |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 630 | .family = NFPROTO_IPV6, |
Jan Engelhardt | 09e410d | 2008-01-31 04:48:13 -0800 | [diff] [blame] | 631 | .match = hashlimit_mt, |
| 632 | .matchsize = sizeof(struct xt_hashlimit_mtinfo1), |
| 633 | .checkentry = hashlimit_mt_check, |
| 634 | .destroy = hashlimit_mt_destroy, |
| 635 | .me = THIS_MODULE, |
| 636 | }, |
Eric Dumazet | 7b21e09 | 2007-12-17 22:45:28 -0800 | [diff] [blame] | 637 | #endif |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 638 | }; |
| 639 | |
| 640 | /* PROC stuff */ |
| 641 | static void *dl_seq_start(struct seq_file *s, loff_t *pos) |
Stephen Hemminger | f4f6fb7 | 2008-01-31 04:08:39 -0800 | [diff] [blame] | 642 | __acquires(htable->lock) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 643 | { |
Alexey Dobriyan | a1004d8 | 2010-01-18 08:14:50 +0100 | [diff] [blame] | 644 | struct xt_hashlimit_htable *htable = s->private; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 645 | unsigned int *bucket; |
| 646 | |
| 647 | spin_lock_bh(&htable->lock); |
| 648 | if (*pos >= htable->cfg.size) |
| 649 | return NULL; |
| 650 | |
| 651 | bucket = kmalloc(sizeof(unsigned int), GFP_ATOMIC); |
| 652 | if (!bucket) |
| 653 | return ERR_PTR(-ENOMEM); |
| 654 | |
| 655 | *bucket = *pos; |
| 656 | return bucket; |
| 657 | } |
| 658 | |
| 659 | static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 660 | { |
Alexey Dobriyan | a1004d8 | 2010-01-18 08:14:50 +0100 | [diff] [blame] | 661 | struct xt_hashlimit_htable *htable = s->private; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 662 | unsigned int *bucket = (unsigned int *)v; |
| 663 | |
| 664 | *pos = ++(*bucket); |
| 665 | if (*pos >= htable->cfg.size) { |
| 666 | kfree(v); |
| 667 | return NULL; |
| 668 | } |
| 669 | return bucket; |
| 670 | } |
| 671 | |
| 672 | static void dl_seq_stop(struct seq_file *s, void *v) |
Stephen Hemminger | f4f6fb7 | 2008-01-31 04:08:39 -0800 | [diff] [blame] | 673 | __releases(htable->lock) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 674 | { |
Alexey Dobriyan | a1004d8 | 2010-01-18 08:14:50 +0100 | [diff] [blame] | 675 | struct xt_hashlimit_htable *htable = s->private; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 676 | unsigned int *bucket = (unsigned int *)v; |
| 677 | |
Eric Dumazet | 55e0d7c | 2010-03-25 11:00:22 +0100 | [diff] [blame] | 678 | if (!IS_ERR(bucket)) |
| 679 | kfree(bucket); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 680 | spin_unlock_bh(&htable->lock); |
| 681 | } |
| 682 | |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 683 | static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family, |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 684 | struct seq_file *s) |
| 685 | { |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 686 | int res; |
| 687 | |
| 688 | spin_lock(&ent->lock); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 689 | /* recalculate to show accurate numbers */ |
| 690 | rateinfo_recalc(ent, jiffies); |
| 691 | |
| 692 | switch (family) { |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 693 | case NFPROTO_IPV4: |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 694 | res = seq_printf(s, "%ld %pI4:%u->%pI4:%u %u %u %u\n", |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 695 | (long)(ent->expires - jiffies)/HZ, |
Harvey Harrison | 14d5e83 | 2008-10-31 00:54:29 -0700 | [diff] [blame] | 696 | &ent->dst.ip.src, |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 697 | ntohs(ent->dst.src_port), |
Harvey Harrison | 14d5e83 | 2008-10-31 00:54:29 -0700 | [diff] [blame] | 698 | &ent->dst.ip.dst, |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 699 | ntohs(ent->dst.dst_port), |
| 700 | ent->rateinfo.credit, ent->rateinfo.credit_cap, |
| 701 | ent->rateinfo.cost); |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 702 | break; |
Eric Dumazet | 7b21e09 | 2007-12-17 22:45:28 -0800 | [diff] [blame] | 703 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 704 | case NFPROTO_IPV6: |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 705 | res = seq_printf(s, "%ld %pI6:%u->%pI6:%u %u %u %u\n", |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 706 | (long)(ent->expires - jiffies)/HZ, |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 707 | &ent->dst.ip6.src, |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 708 | ntohs(ent->dst.src_port), |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 709 | &ent->dst.ip6.dst, |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 710 | ntohs(ent->dst.dst_port), |
| 711 | ent->rateinfo.credit, ent->rateinfo.credit_cap, |
| 712 | ent->rateinfo.cost); |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 713 | break; |
Eric Dumazet | 7b21e09 | 2007-12-17 22:45:28 -0800 | [diff] [blame] | 714 | #endif |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 715 | default: |
| 716 | BUG(); |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 717 | res = 0; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 718 | } |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 719 | spin_unlock(&ent->lock); |
| 720 | return res; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 721 | } |
| 722 | |
| 723 | static int dl_seq_show(struct seq_file *s, void *v) |
| 724 | { |
Alexey Dobriyan | a1004d8 | 2010-01-18 08:14:50 +0100 | [diff] [blame] | 725 | struct xt_hashlimit_htable *htable = s->private; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 726 | unsigned int *bucket = (unsigned int *)v; |
| 727 | struct dsthash_ent *ent; |
| 728 | struct hlist_node *pos; |
| 729 | |
| 730 | if (!hlist_empty(&htable->hash[*bucket])) { |
| 731 | hlist_for_each_entry(ent, pos, &htable->hash[*bucket], node) |
| 732 | if (dl_seq_real_show(ent, htable->family, s)) |
Jesper Dangaard Brouer | 683a04c | 2009-05-27 15:45:34 +0200 | [diff] [blame] | 733 | return -1; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 734 | } |
| 735 | return 0; |
| 736 | } |
| 737 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 738 | static const struct seq_operations dl_seq_ops = { |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 739 | .start = dl_seq_start, |
| 740 | .next = dl_seq_next, |
| 741 | .stop = dl_seq_stop, |
| 742 | .show = dl_seq_show |
| 743 | }; |
| 744 | |
| 745 | static int dl_proc_open(struct inode *inode, struct file *file) |
| 746 | { |
| 747 | int ret = seq_open(file, &dl_seq_ops); |
| 748 | |
| 749 | if (!ret) { |
| 750 | struct seq_file *sf = file->private_data; |
Alexey Dobriyan | a1004d8 | 2010-01-18 08:14:50 +0100 | [diff] [blame] | 751 | sf->private = PDE(inode)->data; |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 752 | } |
| 753 | return ret; |
| 754 | } |
| 755 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 756 | static const struct file_operations dl_file_ops = { |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 757 | .owner = THIS_MODULE, |
| 758 | .open = dl_proc_open, |
| 759 | .read = seq_read, |
| 760 | .llseek = seq_lseek, |
| 761 | .release = seq_release |
| 762 | }; |
| 763 | |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 764 | static int __net_init hashlimit_proc_net_init(struct net *net) |
| 765 | { |
| 766 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); |
| 767 | |
| 768 | hashlimit_net->ipt_hashlimit = proc_mkdir("ipt_hashlimit", net->proc_net); |
| 769 | if (!hashlimit_net->ipt_hashlimit) |
| 770 | return -ENOMEM; |
| 771 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
| 772 | hashlimit_net->ip6t_hashlimit = proc_mkdir("ip6t_hashlimit", net->proc_net); |
| 773 | if (!hashlimit_net->ip6t_hashlimit) { |
| 774 | proc_net_remove(net, "ipt_hashlimit"); |
| 775 | return -ENOMEM; |
| 776 | } |
| 777 | #endif |
| 778 | return 0; |
| 779 | } |
| 780 | |
| 781 | static void __net_exit hashlimit_proc_net_exit(struct net *net) |
| 782 | { |
| 783 | proc_net_remove(net, "ipt_hashlimit"); |
| 784 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
| 785 | proc_net_remove(net, "ip6t_hashlimit"); |
| 786 | #endif |
| 787 | } |
| 788 | |
| 789 | static int __net_init hashlimit_net_init(struct net *net) |
| 790 | { |
| 791 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); |
| 792 | |
| 793 | INIT_HLIST_HEAD(&hashlimit_net->htables); |
| 794 | return hashlimit_proc_net_init(net); |
| 795 | } |
| 796 | |
| 797 | static void __net_exit hashlimit_net_exit(struct net *net) |
| 798 | { |
| 799 | struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); |
| 800 | |
| 801 | BUG_ON(!hlist_empty(&hashlimit_net->htables)); |
| 802 | hashlimit_proc_net_exit(net); |
| 803 | } |
| 804 | |
| 805 | static struct pernet_operations hashlimit_net_ops = { |
| 806 | .init = hashlimit_net_init, |
| 807 | .exit = hashlimit_net_exit, |
| 808 | .id = &hashlimit_net_id, |
| 809 | .size = sizeof(struct hashlimit_net), |
| 810 | }; |
| 811 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 812 | static int __init hashlimit_mt_init(void) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 813 | { |
| 814 | int err; |
| 815 | |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 816 | err = register_pernet_subsys(&hashlimit_net_ops); |
| 817 | if (err < 0) |
| 818 | return err; |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 819 | err = xt_register_matches(hashlimit_mt_reg, |
| 820 | ARRAY_SIZE(hashlimit_mt_reg)); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 821 | if (err < 0) |
| 822 | goto err1; |
| 823 | |
| 824 | err = -ENOMEM; |
| 825 | hashlimit_cachep = kmem_cache_create("xt_hashlimit", |
| 826 | sizeof(struct dsthash_ent), 0, 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 827 | NULL); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 828 | if (!hashlimit_cachep) { |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame] | 829 | pr_warning("unable to create slab cache\n"); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 830 | goto err2; |
| 831 | } |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 832 | return 0; |
| 833 | |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 834 | err2: |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 835 | xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg)); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 836 | err1: |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 837 | unregister_pernet_subsys(&hashlimit_net_ops); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 838 | return err; |
| 839 | |
| 840 | } |
| 841 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 842 | static void __exit hashlimit_mt_exit(void) |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 843 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 844 | xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg)); |
Alexey Dobriyan | e89fc3f | 2010-01-18 08:33:28 +0100 | [diff] [blame] | 845 | unregister_pernet_subsys(&hashlimit_net_ops); |
Eric Dumazet | 02e4eb7 | 2010-04-01 14:35:56 +0200 | [diff] [blame] | 846 | |
| 847 | rcu_barrier_bh(); |
| 848 | kmem_cache_destroy(hashlimit_cachep); |
Patrick McHardy | 39b46fc | 2006-11-29 02:35:36 +0100 | [diff] [blame] | 849 | } |
| 850 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 851 | module_init(hashlimit_mt_init); |
| 852 | module_exit(hashlimit_mt_exit); |