Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
| 2 | * Patrick Schaaf <bof@bof.de> |
Jozsef Kadlecsik | 075e64c | 2013-04-27 14:28:55 +0200 | [diff] [blame] | 3 | * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | /* Kernel module for IP set management */ |
| 11 | |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/ip.h> |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/spinlock.h> |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 18 | #include <linux/rculist.h> |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 19 | #include <net/netlink.h> |
| 20 | |
| 21 | #include <linux/netfilter.h> |
Jozsef Kadlecsik | b66554c | 2011-06-16 18:56:47 +0200 | [diff] [blame] | 22 | #include <linux/netfilter/x_tables.h> |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 23 | #include <linux/netfilter/nfnetlink.h> |
| 24 | #include <linux/netfilter/ipset/ip_set.h> |
| 25 | |
| 26 | static LIST_HEAD(ip_set_type_list); /* all registered set types */ |
| 27 | static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 28 | static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */ |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 29 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 30 | static struct ip_set * __rcu *ip_set_list; /* all individual sets */ |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 31 | static ip_set_id_t ip_set_max = CONFIG_IP_SET_MAX; /* max number of sets */ |
| 32 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 33 | #define IP_SET_INC 64 |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 34 | #define STREQ(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) |
| 35 | |
| 36 | static unsigned int max_sets; |
| 37 | |
| 38 | module_param(max_sets, int, 0600); |
| 39 | MODULE_PARM_DESC(max_sets, "maximal number of sets"); |
| 40 | MODULE_LICENSE("GPL"); |
| 41 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
| 42 | MODULE_DESCRIPTION("core IP set support"); |
| 43 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); |
| 44 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 45 | /* When the nfnl mutex is held: */ |
| 46 | #define nfnl_dereference(p) \ |
| 47 | rcu_dereference_protected(p, 1) |
| 48 | #define nfnl_set(id) \ |
| 49 | nfnl_dereference(ip_set_list)[id] |
| 50 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 51 | /* |
| 52 | * The set types are implemented in modules and registered set types |
| 53 | * can be found in ip_set_type_list. Adding/deleting types is |
| 54 | * serialized by ip_set_type_mutex. |
| 55 | */ |
| 56 | |
| 57 | static inline void |
| 58 | ip_set_type_lock(void) |
| 59 | { |
| 60 | mutex_lock(&ip_set_type_mutex); |
| 61 | } |
| 62 | |
| 63 | static inline void |
| 64 | ip_set_type_unlock(void) |
| 65 | { |
| 66 | mutex_unlock(&ip_set_type_mutex); |
| 67 | } |
| 68 | |
| 69 | /* Register and deregister settype */ |
| 70 | |
| 71 | static struct ip_set_type * |
| 72 | find_set_type(const char *name, u8 family, u8 revision) |
| 73 | { |
| 74 | struct ip_set_type *type; |
| 75 | |
| 76 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
| 77 | if (STREQ(type->name, name) && |
Jozsef Kadlecsik | 3ace95c | 2012-09-21 22:01:45 +0200 | [diff] [blame] | 78 | (type->family == family || |
| 79 | type->family == NFPROTO_UNSPEC) && |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 80 | revision >= type->revision_min && |
| 81 | revision <= type->revision_max) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 82 | return type; |
| 83 | return NULL; |
| 84 | } |
| 85 | |
| 86 | /* Unlock, try to load a set type module and lock again */ |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 87 | static bool |
| 88 | load_settype(const char *name) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 89 | { |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 90 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 91 | pr_debug("try to load ip_set_%s\n", name); |
| 92 | if (request_module("ip_set_%s", name) < 0) { |
| 93 | pr_warning("Can't find ip_set type %s\n", name); |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 94 | nfnl_lock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 95 | return false; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 96 | } |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 97 | nfnl_lock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 98 | return true; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | /* Find a set type and reference it */ |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 102 | #define find_set_type_get(name, family, revision, found) \ |
| 103 | __find_set_type_get(name, family, revision, found, false) |
| 104 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 105 | static int |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 106 | __find_set_type_get(const char *name, u8 family, u8 revision, |
| 107 | struct ip_set_type **found, bool retry) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 108 | { |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame] | 109 | struct ip_set_type *type; |
| 110 | int err; |
| 111 | |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 112 | if (retry && !load_settype(name)) |
| 113 | return -IPSET_ERR_FIND_TYPE; |
| 114 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 115 | rcu_read_lock(); |
| 116 | *found = find_set_type(name, family, revision); |
| 117 | if (*found) { |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame] | 118 | err = !try_module_get((*found)->me) ? -EFAULT : 0; |
| 119 | goto unlock; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 120 | } |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 121 | /* Make sure the type is already loaded |
| 122 | * but we don't support the revision */ |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame] | 123 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
| 124 | if (STREQ(type->name, name)) { |
| 125 | err = -IPSET_ERR_FIND_TYPE; |
| 126 | goto unlock; |
| 127 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 128 | rcu_read_unlock(); |
| 129 | |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 130 | return retry ? -IPSET_ERR_FIND_TYPE : |
| 131 | __find_set_type_get(name, family, revision, found, true); |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame] | 132 | |
| 133 | unlock: |
| 134 | rcu_read_unlock(); |
| 135 | return err; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 136 | } |
| 137 | |
| 138 | /* Find a given set type by name and family. |
| 139 | * If we succeeded, the supported minimal and maximum revisions are |
| 140 | * filled out. |
| 141 | */ |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 142 | #define find_set_type_minmax(name, family, min, max) \ |
| 143 | __find_set_type_minmax(name, family, min, max, false) |
| 144 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 145 | static int |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 146 | __find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max, |
| 147 | bool retry) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 148 | { |
| 149 | struct ip_set_type *type; |
| 150 | bool found = false; |
| 151 | |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 152 | if (retry && !load_settype(name)) |
| 153 | return -IPSET_ERR_FIND_TYPE; |
| 154 | |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame] | 155 | *min = 255; *max = 0; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 156 | rcu_read_lock(); |
| 157 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
| 158 | if (STREQ(type->name, name) && |
Jozsef Kadlecsik | 3ace95c | 2012-09-21 22:01:45 +0200 | [diff] [blame] | 159 | (type->family == family || |
| 160 | type->family == NFPROTO_UNSPEC)) { |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 161 | found = true; |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 162 | if (type->revision_min < *min) |
| 163 | *min = type->revision_min; |
| 164 | if (type->revision_max > *max) |
| 165 | *max = type->revision_max; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 166 | } |
| 167 | rcu_read_unlock(); |
| 168 | if (found) |
| 169 | return 0; |
| 170 | |
Jozsef Kadlecsik | 088067f | 2012-01-17 10:39:05 +0100 | [diff] [blame] | 171 | return retry ? -IPSET_ERR_FIND_TYPE : |
| 172 | __find_set_type_minmax(name, family, min, max, true); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 173 | } |
| 174 | |
Jan Engelhardt | c15f1c8 | 2012-02-14 00:24:10 +0100 | [diff] [blame] | 175 | #define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \ |
| 176 | (f) == NFPROTO_IPV6 ? "inet6" : "any") |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 177 | |
| 178 | /* Register a set type structure. The type is identified by |
| 179 | * the unique triple of name, family and revision. |
| 180 | */ |
| 181 | int |
| 182 | ip_set_type_register(struct ip_set_type *type) |
| 183 | { |
| 184 | int ret = 0; |
| 185 | |
| 186 | if (type->protocol != IPSET_PROTOCOL) { |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 187 | pr_warning("ip_set type %s, family %s, revision %u:%u uses " |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 188 | "wrong protocol version %u (want %u)\n", |
| 189 | type->name, family_name(type->family), |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 190 | type->revision_min, type->revision_max, |
| 191 | type->protocol, IPSET_PROTOCOL); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 192 | return -EINVAL; |
| 193 | } |
| 194 | |
| 195 | ip_set_type_lock(); |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 196 | if (find_set_type(type->name, type->family, type->revision_min)) { |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 197 | /* Duplicate! */ |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 198 | pr_warning("ip_set type %s, family %s with revision min %u " |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 199 | "already registered!\n", type->name, |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 200 | family_name(type->family), type->revision_min); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 201 | ret = -EINVAL; |
| 202 | goto unlock; |
| 203 | } |
| 204 | list_add_rcu(&type->list, &ip_set_type_list); |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 205 | pr_debug("type %s, family %s, revision %u:%u registered.\n", |
| 206 | type->name, family_name(type->family), |
| 207 | type->revision_min, type->revision_max); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 208 | unlock: |
| 209 | ip_set_type_unlock(); |
| 210 | return ret; |
| 211 | } |
| 212 | EXPORT_SYMBOL_GPL(ip_set_type_register); |
| 213 | |
| 214 | /* Unregister a set type. There's a small race with ip_set_create */ |
| 215 | void |
| 216 | ip_set_type_unregister(struct ip_set_type *type) |
| 217 | { |
| 218 | ip_set_type_lock(); |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 219 | if (!find_set_type(type->name, type->family, type->revision_min)) { |
| 220 | pr_warning("ip_set type %s, family %s with revision min %u " |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 221 | "not registered\n", type->name, |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 222 | family_name(type->family), type->revision_min); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 223 | goto unlock; |
| 224 | } |
| 225 | list_del_rcu(&type->list); |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 226 | pr_debug("type %s, family %s with revision min %u unregistered.\n", |
| 227 | type->name, family_name(type->family), type->revision_min); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 228 | unlock: |
| 229 | ip_set_type_unlock(); |
| 230 | |
| 231 | synchronize_rcu(); |
| 232 | } |
| 233 | EXPORT_SYMBOL_GPL(ip_set_type_unregister); |
| 234 | |
| 235 | /* Utility functions */ |
| 236 | void * |
| 237 | ip_set_alloc(size_t size) |
| 238 | { |
| 239 | void *members = NULL; |
| 240 | |
| 241 | if (size < KMALLOC_MAX_SIZE) |
| 242 | members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); |
| 243 | |
| 244 | if (members) { |
| 245 | pr_debug("%p: allocated with kmalloc\n", members); |
| 246 | return members; |
| 247 | } |
| 248 | |
| 249 | members = vzalloc(size); |
| 250 | if (!members) |
| 251 | return NULL; |
| 252 | pr_debug("%p: allocated with vmalloc\n", members); |
| 253 | |
| 254 | return members; |
| 255 | } |
| 256 | EXPORT_SYMBOL_GPL(ip_set_alloc); |
| 257 | |
| 258 | void |
| 259 | ip_set_free(void *members) |
| 260 | { |
| 261 | pr_debug("%p: free with %s\n", members, |
| 262 | is_vmalloc_addr(members) ? "vfree" : "kfree"); |
| 263 | if (is_vmalloc_addr(members)) |
| 264 | vfree(members); |
| 265 | else |
| 266 | kfree(members); |
| 267 | } |
| 268 | EXPORT_SYMBOL_GPL(ip_set_free); |
| 269 | |
| 270 | static inline bool |
| 271 | flag_nested(const struct nlattr *nla) |
| 272 | { |
| 273 | return nla->nla_type & NLA_F_NESTED; |
| 274 | } |
| 275 | |
| 276 | static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { |
| 277 | [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, |
| 278 | [IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY, |
| 279 | .len = sizeof(struct in6_addr) }, |
| 280 | }; |
| 281 | |
| 282 | int |
| 283 | ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) |
| 284 | { |
| 285 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; |
| 286 | |
| 287 | if (unlikely(!flag_nested(nla))) |
| 288 | return -IPSET_ERR_PROTOCOL; |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 289 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 290 | return -IPSET_ERR_PROTOCOL; |
| 291 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) |
| 292 | return -IPSET_ERR_PROTOCOL; |
| 293 | |
| 294 | *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); |
| 295 | return 0; |
| 296 | } |
| 297 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); |
| 298 | |
| 299 | int |
| 300 | ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) |
| 301 | { |
| 302 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; |
| 303 | |
| 304 | if (unlikely(!flag_nested(nla))) |
| 305 | return -IPSET_ERR_PROTOCOL; |
| 306 | |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 307 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 308 | return -IPSET_ERR_PROTOCOL; |
| 309 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) |
| 310 | return -IPSET_ERR_PROTOCOL; |
| 311 | |
| 312 | memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), |
| 313 | sizeof(struct in6_addr)); |
| 314 | return 0; |
| 315 | } |
| 316 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); |
| 317 | |
Jozsef Kadlecsik | 075e64c | 2013-04-27 14:28:55 +0200 | [diff] [blame] | 318 | int |
| 319 | ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[], |
| 320 | struct ip_set_ext *ext) |
| 321 | { |
| 322 | if (tb[IPSET_ATTR_TIMEOUT]) { |
| 323 | if (!(set->extensions & IPSET_EXT_TIMEOUT)) |
| 324 | return -IPSET_ERR_TIMEOUT; |
| 325 | ext->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); |
| 326 | } |
Jozsef Kadlecsik | 34d666d | 2013-04-27 14:38:56 +0200 | [diff] [blame] | 327 | if (tb[IPSET_ATTR_BYTES] || tb[IPSET_ATTR_PACKETS]) { |
| 328 | if (!(set->extensions & IPSET_EXT_COUNTER)) |
| 329 | return -IPSET_ERR_COUNTER; |
| 330 | if (tb[IPSET_ATTR_BYTES]) |
| 331 | ext->bytes = be64_to_cpu(nla_get_be64( |
| 332 | tb[IPSET_ATTR_BYTES])); |
| 333 | if (tb[IPSET_ATTR_PACKETS]) |
| 334 | ext->packets = be64_to_cpu(nla_get_be64( |
| 335 | tb[IPSET_ATTR_PACKETS])); |
| 336 | } |
Jozsef Kadlecsik | 075e64c | 2013-04-27 14:28:55 +0200 | [diff] [blame] | 337 | return 0; |
| 338 | } |
| 339 | EXPORT_SYMBOL_GPL(ip_set_get_extensions); |
| 340 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 341 | /* |
| 342 | * Creating/destroying/renaming/swapping affect the existence and |
| 343 | * the properties of a set. All of these can be executed from userspace |
| 344 | * only and serialized by the nfnl mutex indirectly from nfnetlink. |
| 345 | * |
| 346 | * Sets are identified by their index in ip_set_list and the index |
| 347 | * is used by the external references (set/SET netfilter modules). |
| 348 | * |
| 349 | * The set behind an index may change by swapping only, from userspace. |
| 350 | */ |
| 351 | |
| 352 | static inline void |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 353 | __ip_set_get(struct ip_set *set) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 354 | { |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 355 | write_lock_bh(&ip_set_ref_lock); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 356 | set->ref++; |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 357 | write_unlock_bh(&ip_set_ref_lock); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | static inline void |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 361 | __ip_set_put(struct ip_set *set) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 362 | { |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 363 | write_lock_bh(&ip_set_ref_lock); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 364 | BUG_ON(set->ref == 0); |
| 365 | set->ref--; |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 366 | write_unlock_bh(&ip_set_ref_lock); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Add, del and test set entries from kernel. |
| 371 | * |
| 372 | * The set behind the index must exist and must be referenced |
| 373 | * so it can't be destroyed (or changed) under our foot. |
| 374 | */ |
| 375 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 376 | static inline struct ip_set * |
| 377 | ip_set_rcu_get(ip_set_id_t index) |
| 378 | { |
| 379 | struct ip_set *set; |
| 380 | |
| 381 | rcu_read_lock(); |
| 382 | /* ip_set_list itself needs to be protected */ |
| 383 | set = rcu_dereference(ip_set_list)[index]; |
| 384 | rcu_read_unlock(); |
| 385 | |
| 386 | return set; |
| 387 | } |
| 388 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 389 | int |
| 390 | ip_set_test(ip_set_id_t index, const struct sk_buff *skb, |
Jozsef Kadlecsik | 075e64c | 2013-04-27 14:28:55 +0200 | [diff] [blame] | 391 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 392 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 393 | struct ip_set *set = ip_set_rcu_get(index); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 394 | int ret = 0; |
| 395 | |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 396 | BUG_ON(set == NULL); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 397 | pr_debug("set %s, index %u\n", set->name, index); |
| 398 | |
Jozsef Kadlecsik | ac8cc92 | 2011-06-16 18:42:40 +0200 | [diff] [blame] | 399 | if (opt->dim < set->type->dimension || |
Jan Engelhardt | c15f1c8 | 2012-02-14 00:24:10 +0100 | [diff] [blame] | 400 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 401 | return 0; |
| 402 | |
| 403 | read_lock_bh(&set->lock); |
Jozsef Kadlecsik | b66554c | 2011-06-16 18:56:47 +0200 | [diff] [blame] | 404 | ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 405 | read_unlock_bh(&set->lock); |
| 406 | |
| 407 | if (ret == -EAGAIN) { |
| 408 | /* Type requests element to be completed */ |
| 409 | pr_debug("element must be competed, ADD is triggered\n"); |
| 410 | write_lock_bh(&set->lock); |
Jozsef Kadlecsik | b66554c | 2011-06-16 18:56:47 +0200 | [diff] [blame] | 411 | set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 412 | write_unlock_bh(&set->lock); |
| 413 | ret = 1; |
Jozsef Kadlecsik | 3e0304a | 2012-09-21 22:02:36 +0200 | [diff] [blame] | 414 | } else { |
| 415 | /* --return-nomatch: invert matched element */ |
Jozsef Kadlecsik | 6e01781 | 2013-04-27 14:40:50 +0200 | [diff] [blame] | 416 | if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) && |
Jozsef Kadlecsik | 3e0304a | 2012-09-21 22:02:36 +0200 | [diff] [blame] | 417 | (set->type->features & IPSET_TYPE_NOMATCH) && |
| 418 | (ret > 0 || ret == -ENOTEMPTY)) |
| 419 | ret = -ret; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | /* Convert error codes to nomatch */ |
| 423 | return (ret < 0 ? 0 : ret); |
| 424 | } |
| 425 | EXPORT_SYMBOL_GPL(ip_set_test); |
| 426 | |
| 427 | int |
| 428 | ip_set_add(ip_set_id_t index, const struct sk_buff *skb, |
Jozsef Kadlecsik | 075e64c | 2013-04-27 14:28:55 +0200 | [diff] [blame] | 429 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 430 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 431 | struct ip_set *set = ip_set_rcu_get(index); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 432 | int ret; |
| 433 | |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 434 | BUG_ON(set == NULL); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 435 | pr_debug("set %s, index %u\n", set->name, index); |
| 436 | |
Jozsef Kadlecsik | ac8cc92 | 2011-06-16 18:42:40 +0200 | [diff] [blame] | 437 | if (opt->dim < set->type->dimension || |
Jan Engelhardt | c15f1c8 | 2012-02-14 00:24:10 +0100 | [diff] [blame] | 438 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 439 | return 0; |
| 440 | |
| 441 | write_lock_bh(&set->lock); |
Jozsef Kadlecsik | b66554c | 2011-06-16 18:56:47 +0200 | [diff] [blame] | 442 | ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 443 | write_unlock_bh(&set->lock); |
| 444 | |
| 445 | return ret; |
| 446 | } |
| 447 | EXPORT_SYMBOL_GPL(ip_set_add); |
| 448 | |
| 449 | int |
| 450 | ip_set_del(ip_set_id_t index, const struct sk_buff *skb, |
Jozsef Kadlecsik | 075e64c | 2013-04-27 14:28:55 +0200 | [diff] [blame] | 451 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 452 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 453 | struct ip_set *set = ip_set_rcu_get(index); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 454 | int ret = 0; |
| 455 | |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 456 | BUG_ON(set == NULL); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 457 | pr_debug("set %s, index %u\n", set->name, index); |
| 458 | |
Jozsef Kadlecsik | ac8cc92 | 2011-06-16 18:42:40 +0200 | [diff] [blame] | 459 | if (opt->dim < set->type->dimension || |
Jan Engelhardt | c15f1c8 | 2012-02-14 00:24:10 +0100 | [diff] [blame] | 460 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 461 | return 0; |
| 462 | |
| 463 | write_lock_bh(&set->lock); |
Jozsef Kadlecsik | b66554c | 2011-06-16 18:56:47 +0200 | [diff] [blame] | 464 | ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 465 | write_unlock_bh(&set->lock); |
| 466 | |
| 467 | return ret; |
| 468 | } |
| 469 | EXPORT_SYMBOL_GPL(ip_set_del); |
| 470 | |
| 471 | /* |
| 472 | * Find set by name, reference it once. The reference makes sure the |
| 473 | * thing pointed to, does not go away under our feet. |
| 474 | * |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 475 | */ |
| 476 | ip_set_id_t |
| 477 | ip_set_get_byname(const char *name, struct ip_set **set) |
| 478 | { |
| 479 | ip_set_id_t i, index = IPSET_INVALID_ID; |
| 480 | struct ip_set *s; |
| 481 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 482 | rcu_read_lock(); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 483 | for (i = 0; i < ip_set_max; i++) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 484 | s = rcu_dereference(ip_set_list)[i]; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 485 | if (s != NULL && STREQ(s->name, name)) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 486 | __ip_set_get(s); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 487 | index = i; |
| 488 | *set = s; |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 489 | break; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 490 | } |
| 491 | } |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 492 | rcu_read_unlock(); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 493 | |
| 494 | return index; |
| 495 | } |
| 496 | EXPORT_SYMBOL_GPL(ip_set_get_byname); |
| 497 | |
| 498 | /* |
| 499 | * If the given set pointer points to a valid set, decrement |
| 500 | * reference count by 1. The caller shall not assume the index |
| 501 | * to be valid, after calling this function. |
| 502 | * |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 503 | */ |
| 504 | void |
| 505 | ip_set_put_byindex(ip_set_id_t index) |
| 506 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 507 | struct ip_set *set; |
| 508 | |
| 509 | rcu_read_lock(); |
| 510 | set = rcu_dereference(ip_set_list)[index]; |
| 511 | if (set != NULL) |
| 512 | __ip_set_put(set); |
| 513 | rcu_read_unlock(); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 514 | } |
| 515 | EXPORT_SYMBOL_GPL(ip_set_put_byindex); |
| 516 | |
| 517 | /* |
| 518 | * Get the name of a set behind a set index. |
| 519 | * We assume the set is referenced, so it does exist and |
| 520 | * can't be destroyed. The set cannot be renamed due to |
| 521 | * the referencing either. |
| 522 | * |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 523 | */ |
| 524 | const char * |
| 525 | ip_set_name_byindex(ip_set_id_t index) |
| 526 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 527 | const struct ip_set *set = ip_set_rcu_get(index); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 528 | |
| 529 | BUG_ON(set == NULL); |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 530 | BUG_ON(set->ref == 0); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 531 | |
| 532 | /* Referenced, so it's safe */ |
| 533 | return set->name; |
| 534 | } |
| 535 | EXPORT_SYMBOL_GPL(ip_set_name_byindex); |
| 536 | |
| 537 | /* |
| 538 | * Routines to call by external subsystems, which do not |
| 539 | * call nfnl_lock for us. |
| 540 | */ |
| 541 | |
| 542 | /* |
| 543 | * Find set by name, reference it once. The reference makes sure the |
| 544 | * thing pointed to, does not go away under our feet. |
| 545 | * |
| 546 | * The nfnl mutex is used in the function. |
| 547 | */ |
| 548 | ip_set_id_t |
| 549 | ip_set_nfnl_get(const char *name) |
| 550 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 551 | ip_set_id_t i, index = IPSET_INVALID_ID; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 552 | struct ip_set *s; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 553 | |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 554 | nfnl_lock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 555 | for (i = 0; i < ip_set_max; i++) { |
| 556 | s = nfnl_set(i); |
| 557 | if (s != NULL && STREQ(s->name, name)) { |
| 558 | __ip_set_get(s); |
| 559 | index = i; |
| 560 | break; |
| 561 | } |
| 562 | } |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 563 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 564 | |
| 565 | return index; |
| 566 | } |
| 567 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get); |
| 568 | |
| 569 | /* |
| 570 | * Find set by index, reference it once. The reference makes sure the |
| 571 | * thing pointed to, does not go away under our feet. |
| 572 | * |
| 573 | * The nfnl mutex is used in the function. |
| 574 | */ |
| 575 | ip_set_id_t |
| 576 | ip_set_nfnl_get_byindex(ip_set_id_t index) |
| 577 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 578 | struct ip_set *set; |
| 579 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 580 | if (index > ip_set_max) |
| 581 | return IPSET_INVALID_ID; |
| 582 | |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 583 | nfnl_lock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 584 | set = nfnl_set(index); |
| 585 | if (set) |
| 586 | __ip_set_get(set); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 587 | else |
| 588 | index = IPSET_INVALID_ID; |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 589 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 590 | |
| 591 | return index; |
| 592 | } |
| 593 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); |
| 594 | |
| 595 | /* |
| 596 | * If the given set pointer points to a valid set, decrement |
| 597 | * reference count by 1. The caller shall not assume the index |
| 598 | * to be valid, after calling this function. |
| 599 | * |
| 600 | * The nfnl mutex is used in the function. |
| 601 | */ |
| 602 | void |
| 603 | ip_set_nfnl_put(ip_set_id_t index) |
| 604 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 605 | struct ip_set *set; |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 606 | nfnl_lock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 607 | set = nfnl_set(index); |
| 608 | if (set != NULL) |
| 609 | __ip_set_put(set); |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 610 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 611 | } |
| 612 | EXPORT_SYMBOL_GPL(ip_set_nfnl_put); |
| 613 | |
| 614 | /* |
| 615 | * Communication protocol with userspace over netlink. |
| 616 | * |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 617 | * The commands are serialized by the nfnl mutex. |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 618 | */ |
| 619 | |
| 620 | static inline bool |
| 621 | protocol_failed(const struct nlattr * const tb[]) |
| 622 | { |
| 623 | return !tb[IPSET_ATTR_PROTOCOL] || |
| 624 | nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL; |
| 625 | } |
| 626 | |
| 627 | static inline u32 |
| 628 | flag_exist(const struct nlmsghdr *nlh) |
| 629 | { |
| 630 | return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; |
| 631 | } |
| 632 | |
| 633 | static struct nlmsghdr * |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 634 | start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 635 | enum ipset_cmd cmd) |
| 636 | { |
| 637 | struct nlmsghdr *nlh; |
| 638 | struct nfgenmsg *nfmsg; |
| 639 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 640 | nlh = nlmsg_put(skb, portid, seq, cmd | (NFNL_SUBSYS_IPSET << 8), |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 641 | sizeof(*nfmsg), flags); |
| 642 | if (nlh == NULL) |
| 643 | return NULL; |
| 644 | |
| 645 | nfmsg = nlmsg_data(nlh); |
Jan Engelhardt | c15f1c8 | 2012-02-14 00:24:10 +0100 | [diff] [blame] | 646 | nfmsg->nfgen_family = NFPROTO_IPV4; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 647 | nfmsg->version = NFNETLINK_V0; |
| 648 | nfmsg->res_id = 0; |
| 649 | |
| 650 | return nlh; |
| 651 | } |
| 652 | |
| 653 | /* Create a set */ |
| 654 | |
| 655 | static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 656 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 657 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 658 | .len = IPSET_MAXNAMELEN - 1 }, |
| 659 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, |
| 660 | .len = IPSET_MAXNAMELEN - 1}, |
| 661 | [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, |
| 662 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, |
| 663 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, |
| 664 | }; |
| 665 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 666 | static struct ip_set * |
| 667 | find_set_and_id(const char *name, ip_set_id_t *id) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 668 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 669 | struct ip_set *set = NULL; |
| 670 | ip_set_id_t i; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 671 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 672 | *id = IPSET_INVALID_ID; |
| 673 | for (i = 0; i < ip_set_max; i++) { |
| 674 | set = nfnl_set(i); |
| 675 | if (set != NULL && STREQ(set->name, name)) { |
| 676 | *id = i; |
| 677 | break; |
| 678 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 679 | } |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 680 | return (*id == IPSET_INVALID_ID ? NULL : set); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 681 | } |
| 682 | |
| 683 | static inline struct ip_set * |
| 684 | find_set(const char *name) |
| 685 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 686 | ip_set_id_t id; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 687 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 688 | return find_set_and_id(name, &id); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 689 | } |
| 690 | |
| 691 | static int |
| 692 | find_free_id(const char *name, ip_set_id_t *index, struct ip_set **set) |
| 693 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 694 | struct ip_set *s; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 695 | ip_set_id_t i; |
| 696 | |
| 697 | *index = IPSET_INVALID_ID; |
| 698 | for (i = 0; i < ip_set_max; i++) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 699 | s = nfnl_set(i); |
| 700 | if (s == NULL) { |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 701 | if (*index == IPSET_INVALID_ID) |
| 702 | *index = i; |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 703 | } else if (STREQ(name, s->name)) { |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 704 | /* Name clash */ |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 705 | *set = s; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 706 | return -EEXIST; |
| 707 | } |
| 708 | } |
| 709 | if (*index == IPSET_INVALID_ID) |
| 710 | /* No free slot remained */ |
| 711 | return -IPSET_ERR_MAX_SETS; |
| 712 | return 0; |
| 713 | } |
| 714 | |
| 715 | static int |
Tomasz Bursztyka | d31f4d4 | 2012-06-28 02:57:48 +0000 | [diff] [blame] | 716 | ip_set_none(struct sock *ctnl, struct sk_buff *skb, |
| 717 | const struct nlmsghdr *nlh, |
| 718 | const struct nlattr * const attr[]) |
| 719 | { |
| 720 | return -EOPNOTSUPP; |
| 721 | } |
| 722 | |
| 723 | static int |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 724 | ip_set_create(struct sock *ctnl, struct sk_buff *skb, |
| 725 | const struct nlmsghdr *nlh, |
| 726 | const struct nlattr * const attr[]) |
| 727 | { |
Shan Wei | 9846ada | 2011-03-08 15:37:27 +0100 | [diff] [blame] | 728 | struct ip_set *set, *clash = NULL; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 729 | ip_set_id_t index = IPSET_INVALID_ID; |
| 730 | struct nlattr *tb[IPSET_ATTR_CREATE_MAX+1] = {}; |
| 731 | const char *name, *typename; |
| 732 | u8 family, revision; |
| 733 | u32 flags = flag_exist(nlh); |
| 734 | int ret = 0; |
| 735 | |
| 736 | if (unlikely(protocol_failed(attr) || |
| 737 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 738 | attr[IPSET_ATTR_TYPENAME] == NULL || |
| 739 | attr[IPSET_ATTR_REVISION] == NULL || |
| 740 | attr[IPSET_ATTR_FAMILY] == NULL || |
| 741 | (attr[IPSET_ATTR_DATA] != NULL && |
| 742 | !flag_nested(attr[IPSET_ATTR_DATA])))) |
| 743 | return -IPSET_ERR_PROTOCOL; |
| 744 | |
| 745 | name = nla_data(attr[IPSET_ATTR_SETNAME]); |
| 746 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); |
| 747 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); |
| 748 | revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); |
| 749 | pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", |
| 750 | name, typename, family_name(family), revision); |
| 751 | |
| 752 | /* |
| 753 | * First, and without any locks, allocate and initialize |
| 754 | * a normal base set structure. |
| 755 | */ |
| 756 | set = kzalloc(sizeof(struct ip_set), GFP_KERNEL); |
| 757 | if (!set) |
| 758 | return -ENOMEM; |
| 759 | rwlock_init(&set->lock); |
| 760 | strlcpy(set->name, name, IPSET_MAXNAMELEN); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 761 | set->family = family; |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 762 | set->revision = revision; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 763 | |
| 764 | /* |
| 765 | * Next, check that we know the type, and take |
| 766 | * a reference on the type, to make sure it stays available |
| 767 | * while constructing our new set. |
| 768 | * |
| 769 | * After referencing the type, we try to create the type |
| 770 | * specific part of the set without holding any locks. |
| 771 | */ |
| 772 | ret = find_set_type_get(typename, family, revision, &(set->type)); |
| 773 | if (ret) |
| 774 | goto out; |
| 775 | |
| 776 | /* |
| 777 | * Without holding any locks, create private part. |
| 778 | */ |
| 779 | if (attr[IPSET_ATTR_DATA] && |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 780 | nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], |
| 781 | set->type->create_policy)) { |
Jozsef Kadlecsik | 15b4d93 | 2011-06-16 19:01:26 +0200 | [diff] [blame] | 782 | ret = -IPSET_ERR_PROTOCOL; |
| 783 | goto put_out; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 784 | } |
| 785 | |
| 786 | ret = set->type->create(set, tb, flags); |
| 787 | if (ret != 0) |
| 788 | goto put_out; |
| 789 | |
| 790 | /* BTW, ret==0 here. */ |
| 791 | |
| 792 | /* |
| 793 | * Here, we have a valid, constructed set and we are protected |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 794 | * by the nfnl mutex. Find the first free index in ip_set_list |
| 795 | * and check clashing. |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 796 | */ |
Jozsef Kadlecsik | 3ace95c | 2012-09-21 22:01:45 +0200 | [diff] [blame] | 797 | ret = find_free_id(set->name, &index, &clash); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 798 | if (ret == -EEXIST) { |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 799 | /* If this is the same set and requested, ignore error */ |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 800 | if ((flags & IPSET_FLAG_EXIST) && |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 801 | STREQ(set->type->name, clash->type->name) && |
| 802 | set->type->family == clash->type->family && |
Jozsef Kadlecsik | f1e00b3 | 2011-06-16 18:51:41 +0200 | [diff] [blame] | 803 | set->type->revision_min == clash->type->revision_min && |
| 804 | set->type->revision_max == clash->type->revision_max && |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 805 | set->variant->same_set(set, clash)) |
| 806 | ret = 0; |
| 807 | goto cleanup; |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 808 | } else if (ret == -IPSET_ERR_MAX_SETS) { |
| 809 | struct ip_set **list, **tmp; |
| 810 | ip_set_id_t i = ip_set_max + IP_SET_INC; |
| 811 | |
| 812 | if (i < ip_set_max || i == IPSET_INVALID_ID) |
| 813 | /* Wraparound */ |
| 814 | goto cleanup; |
| 815 | |
| 816 | list = kzalloc(sizeof(struct ip_set *) * i, GFP_KERNEL); |
| 817 | if (!list) |
| 818 | goto cleanup; |
| 819 | /* nfnl mutex is held, both lists are valid */ |
| 820 | tmp = nfnl_dereference(ip_set_list); |
| 821 | memcpy(list, tmp, sizeof(struct ip_set *) * ip_set_max); |
| 822 | rcu_assign_pointer(ip_set_list, list); |
| 823 | /* Make sure all current packets have passed through */ |
| 824 | synchronize_net(); |
| 825 | /* Use new list */ |
| 826 | index = ip_set_max; |
| 827 | ip_set_max = i; |
| 828 | kfree(tmp); |
| 829 | ret = 0; |
| 830 | } else if (ret) |
| 831 | goto cleanup; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 832 | |
| 833 | /* |
| 834 | * Finally! Add our shiny new set to the list, and be done. |
| 835 | */ |
| 836 | pr_debug("create: '%s' created with index %u!\n", set->name, index); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 837 | nfnl_set(index) = set; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 838 | |
| 839 | return ret; |
| 840 | |
| 841 | cleanup: |
| 842 | set->variant->destroy(set); |
| 843 | put_out: |
| 844 | module_put(set->type->me); |
| 845 | out: |
| 846 | kfree(set); |
| 847 | return ret; |
| 848 | } |
| 849 | |
| 850 | /* Destroy sets */ |
| 851 | |
| 852 | static const struct nla_policy |
| 853 | ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 854 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 855 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 856 | .len = IPSET_MAXNAMELEN - 1 }, |
| 857 | }; |
| 858 | |
| 859 | static void |
| 860 | ip_set_destroy_set(ip_set_id_t index) |
| 861 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 862 | struct ip_set *set = nfnl_set(index); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 863 | |
| 864 | pr_debug("set: %s\n", set->name); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 865 | nfnl_set(index) = NULL; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 866 | |
| 867 | /* Must call it without holding any lock */ |
| 868 | set->variant->destroy(set); |
| 869 | module_put(set->type->me); |
| 870 | kfree(set); |
| 871 | } |
| 872 | |
| 873 | static int |
| 874 | ip_set_destroy(struct sock *ctnl, struct sk_buff *skb, |
| 875 | const struct nlmsghdr *nlh, |
| 876 | const struct nlattr * const attr[]) |
| 877 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 878 | struct ip_set *s; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 879 | ip_set_id_t i; |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 880 | int ret = 0; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 881 | |
| 882 | if (unlikely(protocol_failed(attr))) |
| 883 | return -IPSET_ERR_PROTOCOL; |
| 884 | |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 885 | /* Commands are serialized and references are |
| 886 | * protected by the ip_set_ref_lock. |
| 887 | * External systems (i.e. xt_set) must call |
| 888 | * ip_set_put|get_nfnl_* functions, that way we |
| 889 | * can safely check references here. |
| 890 | * |
| 891 | * list:set timer can only decrement the reference |
| 892 | * counter, so if it's already zero, we can proceed |
| 893 | * without holding the lock. |
| 894 | */ |
| 895 | read_lock_bh(&ip_set_ref_lock); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 896 | if (!attr[IPSET_ATTR_SETNAME]) { |
| 897 | for (i = 0; i < ip_set_max; i++) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 898 | s = nfnl_set(i); |
| 899 | if (s != NULL && s->ref) { |
Jozsef Kadlecsik | 9d88323 | 2011-06-16 18:57:44 +0200 | [diff] [blame] | 900 | ret = -IPSET_ERR_BUSY; |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 901 | goto out; |
| 902 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 903 | } |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 904 | read_unlock_bh(&ip_set_ref_lock); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 905 | for (i = 0; i < ip_set_max; i++) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 906 | s = nfnl_set(i); |
| 907 | if (s != NULL) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 908 | ip_set_destroy_set(i); |
| 909 | } |
| 910 | } else { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 911 | s = find_set_and_id(nla_data(attr[IPSET_ATTR_SETNAME]), &i); |
| 912 | if (s == NULL) { |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 913 | ret = -ENOENT; |
| 914 | goto out; |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 915 | } else if (s->ref) { |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 916 | ret = -IPSET_ERR_BUSY; |
| 917 | goto out; |
| 918 | } |
| 919 | read_unlock_bh(&ip_set_ref_lock); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 920 | |
| 921 | ip_set_destroy_set(i); |
| 922 | } |
| 923 | return 0; |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 924 | out: |
| 925 | read_unlock_bh(&ip_set_ref_lock); |
| 926 | return ret; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 927 | } |
| 928 | |
| 929 | /* Flush sets */ |
| 930 | |
| 931 | static void |
| 932 | ip_set_flush_set(struct ip_set *set) |
| 933 | { |
| 934 | pr_debug("set: %s\n", set->name); |
| 935 | |
| 936 | write_lock_bh(&set->lock); |
| 937 | set->variant->flush(set); |
| 938 | write_unlock_bh(&set->lock); |
| 939 | } |
| 940 | |
| 941 | static int |
| 942 | ip_set_flush(struct sock *ctnl, struct sk_buff *skb, |
| 943 | const struct nlmsghdr *nlh, |
| 944 | const struct nlattr * const attr[]) |
| 945 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 946 | struct ip_set *s; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 947 | ip_set_id_t i; |
| 948 | |
| 949 | if (unlikely(protocol_failed(attr))) |
Jozsef Kadlecsik | 9184a9c | 2011-05-24 10:20:19 +0200 | [diff] [blame] | 950 | return -IPSET_ERR_PROTOCOL; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 951 | |
| 952 | if (!attr[IPSET_ATTR_SETNAME]) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 953 | for (i = 0; i < ip_set_max; i++) { |
| 954 | s = nfnl_set(i); |
| 955 | if (s != NULL) |
| 956 | ip_set_flush_set(s); |
| 957 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 958 | } else { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 959 | s = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 960 | if (s == NULL) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 961 | return -ENOENT; |
| 962 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 963 | ip_set_flush_set(s); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 964 | } |
| 965 | |
| 966 | return 0; |
| 967 | } |
| 968 | |
| 969 | /* Rename a set */ |
| 970 | |
| 971 | static const struct nla_policy |
| 972 | ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 973 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 974 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 975 | .len = IPSET_MAXNAMELEN - 1 }, |
| 976 | [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, |
| 977 | .len = IPSET_MAXNAMELEN - 1 }, |
| 978 | }; |
| 979 | |
| 980 | static int |
| 981 | ip_set_rename(struct sock *ctnl, struct sk_buff *skb, |
| 982 | const struct nlmsghdr *nlh, |
| 983 | const struct nlattr * const attr[]) |
| 984 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 985 | struct ip_set *set, *s; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 986 | const char *name2; |
| 987 | ip_set_id_t i; |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 988 | int ret = 0; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 989 | |
| 990 | if (unlikely(protocol_failed(attr) || |
| 991 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 992 | attr[IPSET_ATTR_SETNAME2] == NULL)) |
| 993 | return -IPSET_ERR_PROTOCOL; |
| 994 | |
| 995 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 996 | if (set == NULL) |
| 997 | return -ENOENT; |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 998 | |
| 999 | read_lock_bh(&ip_set_ref_lock); |
| 1000 | if (set->ref != 0) { |
| 1001 | ret = -IPSET_ERR_REFERENCED; |
| 1002 | goto out; |
| 1003 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1004 | |
| 1005 | name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); |
| 1006 | for (i = 0; i < ip_set_max; i++) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1007 | s = nfnl_set(i); |
| 1008 | if (s != NULL && STREQ(s->name, name2)) { |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 1009 | ret = -IPSET_ERR_EXIST_SETNAME2; |
| 1010 | goto out; |
| 1011 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1012 | } |
| 1013 | strncpy(set->name, name2, IPSET_MAXNAMELEN); |
| 1014 | |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 1015 | out: |
| 1016 | read_unlock_bh(&ip_set_ref_lock); |
| 1017 | return ret; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1018 | } |
| 1019 | |
| 1020 | /* Swap two sets so that name/index points to the other. |
| 1021 | * References and set names are also swapped. |
| 1022 | * |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 1023 | * The commands are serialized by the nfnl mutex and references are |
| 1024 | * protected by the ip_set_ref_lock. The kernel interfaces |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1025 | * do not hold the mutex but the pointer settings are atomic |
| 1026 | * so the ip_set_list always contains valid pointers to the sets. |
| 1027 | */ |
| 1028 | |
| 1029 | static int |
| 1030 | ip_set_swap(struct sock *ctnl, struct sk_buff *skb, |
| 1031 | const struct nlmsghdr *nlh, |
| 1032 | const struct nlattr * const attr[]) |
| 1033 | { |
| 1034 | struct ip_set *from, *to; |
| 1035 | ip_set_id_t from_id, to_id; |
| 1036 | char from_name[IPSET_MAXNAMELEN]; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1037 | |
| 1038 | if (unlikely(protocol_failed(attr) || |
| 1039 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 1040 | attr[IPSET_ATTR_SETNAME2] == NULL)) |
| 1041 | return -IPSET_ERR_PROTOCOL; |
| 1042 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1043 | from = find_set_and_id(nla_data(attr[IPSET_ATTR_SETNAME]), &from_id); |
| 1044 | if (from == NULL) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1045 | return -ENOENT; |
| 1046 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1047 | to = find_set_and_id(nla_data(attr[IPSET_ATTR_SETNAME2]), &to_id); |
| 1048 | if (to == NULL) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1049 | return -IPSET_ERR_EXIST_SETNAME2; |
| 1050 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1051 | /* Features must not change. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1052 | * Not an artificial restriction anymore, as we must prevent |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1053 | * possible loops created by swapping in setlist type of sets. */ |
| 1054 | if (!(from->type->features == to->type->features && |
| 1055 | from->type->family == to->type->family)) |
| 1056 | return -IPSET_ERR_TYPE_MISMATCH; |
| 1057 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1058 | strncpy(from_name, from->name, IPSET_MAXNAMELEN); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1059 | strncpy(from->name, to->name, IPSET_MAXNAMELEN); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1060 | strncpy(to->name, from_name, IPSET_MAXNAMELEN); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1061 | |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 1062 | write_lock_bh(&ip_set_ref_lock); |
| 1063 | swap(from->ref, to->ref); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1064 | nfnl_set(from_id) = to; |
| 1065 | nfnl_set(to_id) = from; |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 1066 | write_unlock_bh(&ip_set_ref_lock); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1067 | |
| 1068 | return 0; |
| 1069 | } |
| 1070 | |
| 1071 | /* List/save set data */ |
| 1072 | |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1073 | #define DUMP_INIT 0 |
| 1074 | #define DUMP_ALL 1 |
| 1075 | #define DUMP_ONE 2 |
| 1076 | #define DUMP_LAST 3 |
| 1077 | |
| 1078 | #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) |
| 1079 | #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1080 | |
| 1081 | static int |
| 1082 | ip_set_dump_done(struct netlink_callback *cb) |
| 1083 | { |
| 1084 | if (cb->args[2]) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1085 | pr_debug("release set %s\n", nfnl_set(cb->args[1])->name); |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 1086 | ip_set_put_byindex((ip_set_id_t) cb->args[1]); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1087 | } |
| 1088 | return 0; |
| 1089 | } |
| 1090 | |
| 1091 | static inline void |
| 1092 | dump_attrs(struct nlmsghdr *nlh) |
| 1093 | { |
| 1094 | const struct nlattr *attr; |
| 1095 | int rem; |
| 1096 | |
| 1097 | pr_debug("dump nlmsg\n"); |
| 1098 | nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { |
| 1099 | pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); |
| 1100 | } |
| 1101 | } |
| 1102 | |
| 1103 | static int |
| 1104 | dump_init(struct netlink_callback *cb) |
| 1105 | { |
| 1106 | struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 1107 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1108 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; |
| 1109 | struct nlattr *attr = (void *)nlh + min_len; |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1110 | u32 dump_type; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1111 | ip_set_id_t index; |
| 1112 | |
| 1113 | /* Second pass, so parser can't fail */ |
| 1114 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
| 1115 | attr, nlh->nlmsg_len - min_len, ip_set_setname_policy); |
| 1116 | |
| 1117 | /* cb->args[0] : dump single set/all sets |
| 1118 | * [1] : set index |
| 1119 | * [..]: type specific |
| 1120 | */ |
| 1121 | |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1122 | if (cda[IPSET_ATTR_SETNAME]) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1123 | struct ip_set *set; |
| 1124 | |
| 1125 | set = find_set_and_id(nla_data(cda[IPSET_ATTR_SETNAME]), |
| 1126 | &index); |
| 1127 | if (set == NULL) |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1128 | return -ENOENT; |
| 1129 | |
| 1130 | dump_type = DUMP_ONE; |
| 1131 | cb->args[1] = index; |
| 1132 | } else |
| 1133 | dump_type = DUMP_ALL; |
| 1134 | |
| 1135 | if (cda[IPSET_ATTR_FLAGS]) { |
| 1136 | u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); |
| 1137 | dump_type |= (f << 16); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1138 | } |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1139 | cb->args[0] = dump_type; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1140 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1141 | return 0; |
| 1142 | } |
| 1143 | |
| 1144 | static int |
| 1145 | ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb) |
| 1146 | { |
| 1147 | ip_set_id_t index = IPSET_INVALID_ID, max; |
| 1148 | struct ip_set *set = NULL; |
| 1149 | struct nlmsghdr *nlh = NULL; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1150 | unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0; |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1151 | u32 dump_type, dump_flags; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1152 | int ret = 0; |
| 1153 | |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1154 | if (!cb->args[0]) { |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1155 | ret = dump_init(cb); |
| 1156 | if (ret < 0) { |
| 1157 | nlh = nlmsg_hdr(cb->skb); |
| 1158 | /* We have to create and send the error message |
| 1159 | * manually :-( */ |
| 1160 | if (nlh->nlmsg_flags & NLM_F_ACK) |
| 1161 | netlink_ack(cb->skb, nlh, ret); |
| 1162 | return ret; |
| 1163 | } |
| 1164 | } |
| 1165 | |
| 1166 | if (cb->args[1] >= ip_set_max) |
| 1167 | goto out; |
| 1168 | |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1169 | dump_type = DUMP_TYPE(cb->args[0]); |
| 1170 | dump_flags = DUMP_FLAGS(cb->args[0]); |
| 1171 | max = dump_type == DUMP_ONE ? cb->args[1] + 1 : ip_set_max; |
Jozsef Kadlecsik | a8a8a09 | 2011-04-19 15:59:15 +0200 | [diff] [blame] | 1172 | dump_last: |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1173 | pr_debug("args[0]: %u %u args[1]: %ld\n", |
| 1174 | dump_type, dump_flags, cb->args[1]); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1175 | for (; cb->args[1] < max; cb->args[1]++) { |
| 1176 | index = (ip_set_id_t) cb->args[1]; |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1177 | set = nfnl_set(index); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1178 | if (set == NULL) { |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1179 | if (dump_type == DUMP_ONE) { |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1180 | ret = -ENOENT; |
| 1181 | goto out; |
| 1182 | } |
| 1183 | continue; |
| 1184 | } |
| 1185 | /* When dumping all sets, we must dump "sorted" |
| 1186 | * so that lists (unions of sets) are dumped last. |
| 1187 | */ |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1188 | if (dump_type != DUMP_ONE && |
| 1189 | ((dump_type == DUMP_ALL) == |
Jozsef Kadlecsik | a8a8a09 | 2011-04-19 15:59:15 +0200 | [diff] [blame] | 1190 | !!(set->type->features & IPSET_DUMP_LAST))) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1191 | continue; |
| 1192 | pr_debug("List set: %s\n", set->name); |
| 1193 | if (!cb->args[2]) { |
| 1194 | /* Start listing: make sure set won't be destroyed */ |
| 1195 | pr_debug("reference set\n"); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1196 | __ip_set_get(set); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1197 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1198 | nlh = start_msg(skb, NETLINK_CB(cb->skb).portid, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1199 | cb->nlh->nlmsg_seq, flags, |
| 1200 | IPSET_CMD_LIST); |
| 1201 | if (!nlh) { |
| 1202 | ret = -EMSGSIZE; |
| 1203 | goto release_refcount; |
| 1204 | } |
David S. Miller | 7cf7899 | 2012-04-01 19:54:46 -0400 | [diff] [blame] | 1205 | if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
| 1206 | nla_put_string(skb, IPSET_ATTR_SETNAME, set->name)) |
| 1207 | goto nla_put_failure; |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1208 | if (dump_flags & IPSET_FLAG_LIST_SETNAME) |
| 1209 | goto next_set; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1210 | switch (cb->args[2]) { |
| 1211 | case 0: |
| 1212 | /* Core header data */ |
David S. Miller | 7cf7899 | 2012-04-01 19:54:46 -0400 | [diff] [blame] | 1213 | if (nla_put_string(skb, IPSET_ATTR_TYPENAME, |
| 1214 | set->type->name) || |
| 1215 | nla_put_u8(skb, IPSET_ATTR_FAMILY, |
| 1216 | set->family) || |
| 1217 | nla_put_u8(skb, IPSET_ATTR_REVISION, |
| 1218 | set->revision)) |
| 1219 | goto nla_put_failure; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1220 | ret = set->variant->head(set, skb); |
| 1221 | if (ret < 0) |
| 1222 | goto release_refcount; |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1223 | if (dump_flags & IPSET_FLAG_LIST_HEADER) |
| 1224 | goto next_set; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1225 | /* Fall through and add elements */ |
| 1226 | default: |
| 1227 | read_lock_bh(&set->lock); |
| 1228 | ret = set->variant->list(set, skb, cb); |
| 1229 | read_unlock_bh(&set->lock); |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1230 | if (!cb->args[2]) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1231 | /* Set is done, proceed with next one */ |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1232 | goto next_set; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1233 | goto release_refcount; |
| 1234 | } |
| 1235 | } |
Jozsef Kadlecsik | a8a8a09 | 2011-04-19 15:59:15 +0200 | [diff] [blame] | 1236 | /* If we dump all sets, continue with dumping last ones */ |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1237 | if (dump_type == DUMP_ALL) { |
| 1238 | dump_type = DUMP_LAST; |
| 1239 | cb->args[0] = dump_type | (dump_flags << 16); |
Jozsef Kadlecsik | a8a8a09 | 2011-04-19 15:59:15 +0200 | [diff] [blame] | 1240 | cb->args[1] = 0; |
| 1241 | goto dump_last; |
| 1242 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1243 | goto out; |
| 1244 | |
| 1245 | nla_put_failure: |
| 1246 | ret = -EFAULT; |
Jozsef Kadlecsik | c1e2e04 | 2011-06-16 18:47:07 +0200 | [diff] [blame] | 1247 | next_set: |
| 1248 | if (dump_type == DUMP_ONE) |
| 1249 | cb->args[1] = IPSET_INVALID_ID; |
| 1250 | else |
| 1251 | cb->args[1]++; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1252 | release_refcount: |
| 1253 | /* If there was an error or set is done, release set */ |
| 1254 | if (ret || !cb->args[2]) { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1255 | pr_debug("release set %s\n", nfnl_set(index)->name); |
Jozsef Kadlecsik | 2f9f28b | 2011-04-04 15:19:25 +0200 | [diff] [blame] | 1256 | ip_set_put_byindex(index); |
Jozsef Kadlecsik | be94db9 | 2012-01-14 16:42:13 +0100 | [diff] [blame] | 1257 | cb->args[2] = 0; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1258 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1259 | out: |
| 1260 | if (nlh) { |
| 1261 | nlmsg_end(skb, nlh); |
| 1262 | pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); |
| 1263 | dump_attrs(nlh); |
| 1264 | } |
| 1265 | |
| 1266 | return ret < 0 ? ret : skb->len; |
| 1267 | } |
| 1268 | |
| 1269 | static int |
| 1270 | ip_set_dump(struct sock *ctnl, struct sk_buff *skb, |
| 1271 | const struct nlmsghdr *nlh, |
| 1272 | const struct nlattr * const attr[]) |
| 1273 | { |
| 1274 | if (unlikely(protocol_failed(attr))) |
| 1275 | return -IPSET_ERR_PROTOCOL; |
| 1276 | |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 1277 | { |
| 1278 | struct netlink_dump_control c = { |
| 1279 | .dump = ip_set_dump_start, |
| 1280 | .done = ip_set_dump_done, |
| 1281 | }; |
| 1282 | return netlink_dump_start(ctnl, skb, nlh, &c); |
| 1283 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1284 | } |
| 1285 | |
| 1286 | /* Add, del and test */ |
| 1287 | |
| 1288 | static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1289 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1290 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 1291 | .len = IPSET_MAXNAMELEN - 1 }, |
| 1292 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, |
| 1293 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, |
| 1294 | [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, |
| 1295 | }; |
| 1296 | |
| 1297 | static int |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1298 | call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1299 | struct nlattr *tb[], enum ipset_adt adt, |
| 1300 | u32 flags, bool use_lineno) |
| 1301 | { |
Jozsef Kadlecsik | 3d14b17 | 2011-06-16 18:49:17 +0200 | [diff] [blame] | 1302 | int ret; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1303 | u32 lineno = 0; |
Jozsef Kadlecsik | 3d14b17 | 2011-06-16 18:49:17 +0200 | [diff] [blame] | 1304 | bool eexist = flags & IPSET_FLAG_EXIST, retried = false; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1305 | |
| 1306 | do { |
| 1307 | write_lock_bh(&set->lock); |
Jozsef Kadlecsik | 3d14b17 | 2011-06-16 18:49:17 +0200 | [diff] [blame] | 1308 | ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1309 | write_unlock_bh(&set->lock); |
Jozsef Kadlecsik | 3d14b17 | 2011-06-16 18:49:17 +0200 | [diff] [blame] | 1310 | retried = true; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1311 | } while (ret == -EAGAIN && |
| 1312 | set->variant->resize && |
Jozsef Kadlecsik | 3d14b17 | 2011-06-16 18:49:17 +0200 | [diff] [blame] | 1313 | (ret = set->variant->resize(set, retried)) == 0); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1314 | |
| 1315 | if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) |
| 1316 | return 0; |
| 1317 | if (lineno && use_lineno) { |
| 1318 | /* Error in restore/batch mode: send back lineno */ |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1319 | struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); |
| 1320 | struct sk_buff *skb2; |
| 1321 | struct nlmsgerr *errmsg; |
| 1322 | size_t payload = sizeof(*errmsg) + nlmsg_len(nlh); |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 1323 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1324 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1325 | struct nlattr *cmdattr; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1326 | u32 *errline; |
| 1327 | |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1328 | skb2 = nlmsg_new(payload, GFP_KERNEL); |
| 1329 | if (skb2 == NULL) |
| 1330 | return -ENOMEM; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1331 | rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid, |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1332 | nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); |
| 1333 | errmsg = nlmsg_data(rep); |
| 1334 | errmsg->error = ret; |
| 1335 | memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); |
| 1336 | cmdattr = (void *)&errmsg->msg + min_len; |
| 1337 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1338 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
| 1339 | cmdattr, nlh->nlmsg_len - min_len, |
| 1340 | ip_set_adt_policy); |
| 1341 | |
| 1342 | errline = nla_data(cda[IPSET_ATTR_LINENO]); |
| 1343 | |
| 1344 | *errline = lineno; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1345 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1346 | netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1347 | /* Signal netlink not to send its ACK/errmsg. */ |
| 1348 | return -EINTR; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1349 | } |
| 1350 | |
| 1351 | return ret; |
| 1352 | } |
| 1353 | |
| 1354 | static int |
| 1355 | ip_set_uadd(struct sock *ctnl, struct sk_buff *skb, |
| 1356 | const struct nlmsghdr *nlh, |
| 1357 | const struct nlattr * const attr[]) |
| 1358 | { |
| 1359 | struct ip_set *set; |
| 1360 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; |
| 1361 | const struct nlattr *nla; |
| 1362 | u32 flags = flag_exist(nlh); |
| 1363 | bool use_lineno; |
| 1364 | int ret = 0; |
| 1365 | |
| 1366 | if (unlikely(protocol_failed(attr) || |
| 1367 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 1368 | !((attr[IPSET_ATTR_DATA] != NULL) ^ |
| 1369 | (attr[IPSET_ATTR_ADT] != NULL)) || |
| 1370 | (attr[IPSET_ATTR_DATA] != NULL && |
| 1371 | !flag_nested(attr[IPSET_ATTR_DATA])) || |
| 1372 | (attr[IPSET_ATTR_ADT] != NULL && |
| 1373 | (!flag_nested(attr[IPSET_ATTR_ADT]) || |
| 1374 | attr[IPSET_ATTR_LINENO] == NULL)))) |
| 1375 | return -IPSET_ERR_PROTOCOL; |
| 1376 | |
| 1377 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1378 | if (set == NULL) |
| 1379 | return -ENOENT; |
| 1380 | |
| 1381 | use_lineno = !!attr[IPSET_ATTR_LINENO]; |
| 1382 | if (attr[IPSET_ATTR_DATA]) { |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1383 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
| 1384 | attr[IPSET_ATTR_DATA], |
| 1385 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1386 | return -IPSET_ERR_PROTOCOL; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1387 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags, |
| 1388 | use_lineno); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1389 | } else { |
| 1390 | int nla_rem; |
| 1391 | |
| 1392 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { |
| 1393 | memset(tb, 0, sizeof(tb)); |
| 1394 | if (nla_type(nla) != IPSET_ATTR_DATA || |
| 1395 | !flag_nested(nla) || |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1396 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
| 1397 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1398 | return -IPSET_ERR_PROTOCOL; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1399 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1400 | flags, use_lineno); |
| 1401 | if (ret < 0) |
| 1402 | return ret; |
| 1403 | } |
| 1404 | } |
| 1405 | return ret; |
| 1406 | } |
| 1407 | |
| 1408 | static int |
| 1409 | ip_set_udel(struct sock *ctnl, struct sk_buff *skb, |
| 1410 | const struct nlmsghdr *nlh, |
| 1411 | const struct nlattr * const attr[]) |
| 1412 | { |
| 1413 | struct ip_set *set; |
| 1414 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; |
| 1415 | const struct nlattr *nla; |
| 1416 | u32 flags = flag_exist(nlh); |
| 1417 | bool use_lineno; |
| 1418 | int ret = 0; |
| 1419 | |
| 1420 | if (unlikely(protocol_failed(attr) || |
| 1421 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 1422 | !((attr[IPSET_ATTR_DATA] != NULL) ^ |
| 1423 | (attr[IPSET_ATTR_ADT] != NULL)) || |
| 1424 | (attr[IPSET_ATTR_DATA] != NULL && |
| 1425 | !flag_nested(attr[IPSET_ATTR_DATA])) || |
| 1426 | (attr[IPSET_ATTR_ADT] != NULL && |
| 1427 | (!flag_nested(attr[IPSET_ATTR_ADT]) || |
| 1428 | attr[IPSET_ATTR_LINENO] == NULL)))) |
| 1429 | return -IPSET_ERR_PROTOCOL; |
| 1430 | |
| 1431 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1432 | if (set == NULL) |
| 1433 | return -ENOENT; |
| 1434 | |
| 1435 | use_lineno = !!attr[IPSET_ATTR_LINENO]; |
| 1436 | if (attr[IPSET_ATTR_DATA]) { |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1437 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
| 1438 | attr[IPSET_ATTR_DATA], |
| 1439 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1440 | return -IPSET_ERR_PROTOCOL; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1441 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags, |
| 1442 | use_lineno); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1443 | } else { |
| 1444 | int nla_rem; |
| 1445 | |
| 1446 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { |
| 1447 | memset(tb, 0, sizeof(*tb)); |
| 1448 | if (nla_type(nla) != IPSET_ATTR_DATA || |
| 1449 | !flag_nested(nla) || |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1450 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
| 1451 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1452 | return -IPSET_ERR_PROTOCOL; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1453 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1454 | flags, use_lineno); |
| 1455 | if (ret < 0) |
| 1456 | return ret; |
| 1457 | } |
| 1458 | } |
| 1459 | return ret; |
| 1460 | } |
| 1461 | |
| 1462 | static int |
| 1463 | ip_set_utest(struct sock *ctnl, struct sk_buff *skb, |
| 1464 | const struct nlmsghdr *nlh, |
| 1465 | const struct nlattr * const attr[]) |
| 1466 | { |
| 1467 | struct ip_set *set; |
| 1468 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; |
| 1469 | int ret = 0; |
| 1470 | |
| 1471 | if (unlikely(protocol_failed(attr) || |
| 1472 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 1473 | attr[IPSET_ATTR_DATA] == NULL || |
| 1474 | !flag_nested(attr[IPSET_ATTR_DATA]))) |
| 1475 | return -IPSET_ERR_PROTOCOL; |
| 1476 | |
| 1477 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1478 | if (set == NULL) |
| 1479 | return -ENOENT; |
| 1480 | |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1481 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], |
| 1482 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1483 | return -IPSET_ERR_PROTOCOL; |
| 1484 | |
| 1485 | read_lock_bh(&set->lock); |
Jozsef Kadlecsik | 3d14b17 | 2011-06-16 18:49:17 +0200 | [diff] [blame] | 1486 | ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0, 0); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1487 | read_unlock_bh(&set->lock); |
| 1488 | /* Userspace can't trigger element to be re-added */ |
| 1489 | if (ret == -EAGAIN) |
| 1490 | ret = 1; |
| 1491 | |
Jozsef Kadlecsik | 0f1799b | 2013-09-16 20:04:53 +0200 | [diff] [blame^] | 1492 | return ret > 0 ? 0 : -IPSET_ERR_EXIST; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1493 | } |
| 1494 | |
| 1495 | /* Get headed data of a set */ |
| 1496 | |
| 1497 | static int |
| 1498 | ip_set_header(struct sock *ctnl, struct sk_buff *skb, |
| 1499 | const struct nlmsghdr *nlh, |
| 1500 | const struct nlattr * const attr[]) |
| 1501 | { |
| 1502 | const struct ip_set *set; |
| 1503 | struct sk_buff *skb2; |
| 1504 | struct nlmsghdr *nlh2; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1505 | int ret = 0; |
| 1506 | |
| 1507 | if (unlikely(protocol_failed(attr) || |
| 1508 | attr[IPSET_ATTR_SETNAME] == NULL)) |
| 1509 | return -IPSET_ERR_PROTOCOL; |
| 1510 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1511 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1512 | if (set == NULL) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1513 | return -ENOENT; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1514 | |
| 1515 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1516 | if (skb2 == NULL) |
| 1517 | return -ENOMEM; |
| 1518 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1519 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1520 | IPSET_CMD_HEADER); |
| 1521 | if (!nlh2) |
| 1522 | goto nlmsg_failure; |
David S. Miller | 7cf7899 | 2012-04-01 19:54:46 -0400 | [diff] [blame] | 1523 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
| 1524 | nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || |
| 1525 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || |
| 1526 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || |
| 1527 | nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) |
| 1528 | goto nla_put_failure; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1529 | nlmsg_end(skb2, nlh2); |
| 1530 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1531 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1532 | if (ret < 0) |
| 1533 | return ret; |
| 1534 | |
| 1535 | return 0; |
| 1536 | |
| 1537 | nla_put_failure: |
| 1538 | nlmsg_cancel(skb2, nlh2); |
| 1539 | nlmsg_failure: |
| 1540 | kfree_skb(skb2); |
| 1541 | return -EMSGSIZE; |
| 1542 | } |
| 1543 | |
| 1544 | /* Get type data */ |
| 1545 | |
| 1546 | static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1547 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1548 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, |
| 1549 | .len = IPSET_MAXNAMELEN - 1 }, |
| 1550 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, |
| 1551 | }; |
| 1552 | |
| 1553 | static int |
| 1554 | ip_set_type(struct sock *ctnl, struct sk_buff *skb, |
| 1555 | const struct nlmsghdr *nlh, |
| 1556 | const struct nlattr * const attr[]) |
| 1557 | { |
| 1558 | struct sk_buff *skb2; |
| 1559 | struct nlmsghdr *nlh2; |
| 1560 | u8 family, min, max; |
| 1561 | const char *typename; |
| 1562 | int ret = 0; |
| 1563 | |
| 1564 | if (unlikely(protocol_failed(attr) || |
| 1565 | attr[IPSET_ATTR_TYPENAME] == NULL || |
| 1566 | attr[IPSET_ATTR_FAMILY] == NULL)) |
| 1567 | return -IPSET_ERR_PROTOCOL; |
| 1568 | |
| 1569 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); |
| 1570 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); |
| 1571 | ret = find_set_type_minmax(typename, family, &min, &max); |
| 1572 | if (ret) |
| 1573 | return ret; |
| 1574 | |
| 1575 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1576 | if (skb2 == NULL) |
| 1577 | return -ENOMEM; |
| 1578 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1579 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1580 | IPSET_CMD_TYPE); |
| 1581 | if (!nlh2) |
| 1582 | goto nlmsg_failure; |
David S. Miller | 7cf7899 | 2012-04-01 19:54:46 -0400 | [diff] [blame] | 1583 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
| 1584 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || |
| 1585 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || |
| 1586 | nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || |
| 1587 | nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) |
| 1588 | goto nla_put_failure; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1589 | nlmsg_end(skb2, nlh2); |
| 1590 | |
| 1591 | pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1592 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1593 | if (ret < 0) |
| 1594 | return ret; |
| 1595 | |
| 1596 | return 0; |
| 1597 | |
| 1598 | nla_put_failure: |
| 1599 | nlmsg_cancel(skb2, nlh2); |
| 1600 | nlmsg_failure: |
| 1601 | kfree_skb(skb2); |
| 1602 | return -EMSGSIZE; |
| 1603 | } |
| 1604 | |
| 1605 | /* Get protocol version */ |
| 1606 | |
| 1607 | static const struct nla_policy |
| 1608 | ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1609 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1610 | }; |
| 1611 | |
| 1612 | static int |
| 1613 | ip_set_protocol(struct sock *ctnl, struct sk_buff *skb, |
| 1614 | const struct nlmsghdr *nlh, |
| 1615 | const struct nlattr * const attr[]) |
| 1616 | { |
| 1617 | struct sk_buff *skb2; |
| 1618 | struct nlmsghdr *nlh2; |
| 1619 | int ret = 0; |
| 1620 | |
| 1621 | if (unlikely(attr[IPSET_ATTR_PROTOCOL] == NULL)) |
| 1622 | return -IPSET_ERR_PROTOCOL; |
| 1623 | |
| 1624 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1625 | if (skb2 == NULL) |
| 1626 | return -ENOMEM; |
| 1627 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1628 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1629 | IPSET_CMD_PROTOCOL); |
| 1630 | if (!nlh2) |
| 1631 | goto nlmsg_failure; |
David S. Miller | 7cf7899 | 2012-04-01 19:54:46 -0400 | [diff] [blame] | 1632 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) |
| 1633 | goto nla_put_failure; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1634 | nlmsg_end(skb2, nlh2); |
| 1635 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1636 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1637 | if (ret < 0) |
| 1638 | return ret; |
| 1639 | |
| 1640 | return 0; |
| 1641 | |
| 1642 | nla_put_failure: |
| 1643 | nlmsg_cancel(skb2, nlh2); |
| 1644 | nlmsg_failure: |
| 1645 | kfree_skb(skb2); |
| 1646 | return -EMSGSIZE; |
| 1647 | } |
| 1648 | |
| 1649 | static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { |
Tomasz Bursztyka | d31f4d4 | 2012-06-28 02:57:48 +0000 | [diff] [blame] | 1650 | [IPSET_CMD_NONE] = { |
| 1651 | .call = ip_set_none, |
| 1652 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1653 | }, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1654 | [IPSET_CMD_CREATE] = { |
| 1655 | .call = ip_set_create, |
| 1656 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1657 | .policy = ip_set_create_policy, |
| 1658 | }, |
| 1659 | [IPSET_CMD_DESTROY] = { |
| 1660 | .call = ip_set_destroy, |
| 1661 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1662 | .policy = ip_set_setname_policy, |
| 1663 | }, |
| 1664 | [IPSET_CMD_FLUSH] = { |
| 1665 | .call = ip_set_flush, |
| 1666 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1667 | .policy = ip_set_setname_policy, |
| 1668 | }, |
| 1669 | [IPSET_CMD_RENAME] = { |
| 1670 | .call = ip_set_rename, |
| 1671 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1672 | .policy = ip_set_setname2_policy, |
| 1673 | }, |
| 1674 | [IPSET_CMD_SWAP] = { |
| 1675 | .call = ip_set_swap, |
| 1676 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1677 | .policy = ip_set_setname2_policy, |
| 1678 | }, |
| 1679 | [IPSET_CMD_LIST] = { |
| 1680 | .call = ip_set_dump, |
| 1681 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1682 | .policy = ip_set_setname_policy, |
| 1683 | }, |
| 1684 | [IPSET_CMD_SAVE] = { |
| 1685 | .call = ip_set_dump, |
| 1686 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1687 | .policy = ip_set_setname_policy, |
| 1688 | }, |
| 1689 | [IPSET_CMD_ADD] = { |
| 1690 | .call = ip_set_uadd, |
| 1691 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1692 | .policy = ip_set_adt_policy, |
| 1693 | }, |
| 1694 | [IPSET_CMD_DEL] = { |
| 1695 | .call = ip_set_udel, |
| 1696 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1697 | .policy = ip_set_adt_policy, |
| 1698 | }, |
| 1699 | [IPSET_CMD_TEST] = { |
| 1700 | .call = ip_set_utest, |
| 1701 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1702 | .policy = ip_set_adt_policy, |
| 1703 | }, |
| 1704 | [IPSET_CMD_HEADER] = { |
| 1705 | .call = ip_set_header, |
| 1706 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1707 | .policy = ip_set_setname_policy, |
| 1708 | }, |
| 1709 | [IPSET_CMD_TYPE] = { |
| 1710 | .call = ip_set_type, |
| 1711 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1712 | .policy = ip_set_type_policy, |
| 1713 | }, |
| 1714 | [IPSET_CMD_PROTOCOL] = { |
| 1715 | .call = ip_set_protocol, |
| 1716 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1717 | .policy = ip_set_protocol_policy, |
| 1718 | }, |
| 1719 | }; |
| 1720 | |
| 1721 | static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { |
| 1722 | .name = "ip_set", |
| 1723 | .subsys_id = NFNL_SUBSYS_IPSET, |
| 1724 | .cb_count = IPSET_MSG_MAX, |
| 1725 | .cb = ip_set_netlink_subsys_cb, |
| 1726 | }; |
| 1727 | |
| 1728 | /* Interface to iptables/ip6tables */ |
| 1729 | |
| 1730 | static int |
| 1731 | ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) |
| 1732 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1733 | unsigned int *op; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1734 | void *data; |
| 1735 | int copylen = *len, ret = 0; |
| 1736 | |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 1737 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1738 | return -EPERM; |
| 1739 | if (optval != SO_IP_SET) |
| 1740 | return -EBADF; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1741 | if (*len < sizeof(unsigned int)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1742 | return -EINVAL; |
| 1743 | |
| 1744 | data = vmalloc(*len); |
| 1745 | if (!data) |
| 1746 | return -ENOMEM; |
| 1747 | if (copy_from_user(data, user, *len) != 0) { |
| 1748 | ret = -EFAULT; |
| 1749 | goto done; |
| 1750 | } |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1751 | op = (unsigned int *) data; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1752 | |
| 1753 | if (*op < IP_SET_OP_VERSION) { |
| 1754 | /* Check the version at the beginning of operations */ |
| 1755 | struct ip_set_req_version *req_version = data; |
| 1756 | if (req_version->version != IPSET_PROTOCOL) { |
| 1757 | ret = -EPROTO; |
| 1758 | goto done; |
| 1759 | } |
| 1760 | } |
| 1761 | |
| 1762 | switch (*op) { |
| 1763 | case IP_SET_OP_VERSION: { |
| 1764 | struct ip_set_req_version *req_version = data; |
| 1765 | |
| 1766 | if (*len != sizeof(struct ip_set_req_version)) { |
| 1767 | ret = -EINVAL; |
| 1768 | goto done; |
| 1769 | } |
| 1770 | |
| 1771 | req_version->version = IPSET_PROTOCOL; |
| 1772 | ret = copy_to_user(user, req_version, |
| 1773 | sizeof(struct ip_set_req_version)); |
| 1774 | goto done; |
| 1775 | } |
| 1776 | case IP_SET_OP_GET_BYNAME: { |
| 1777 | struct ip_set_req_get_set *req_get = data; |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1778 | ip_set_id_t id; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1779 | |
| 1780 | if (*len != sizeof(struct ip_set_req_get_set)) { |
| 1781 | ret = -EINVAL; |
| 1782 | goto done; |
| 1783 | } |
| 1784 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 1785 | nfnl_lock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1786 | find_set_and_id(req_get->set.name, &id); |
| 1787 | req_get->set.index = id; |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 1788 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1789 | goto copy; |
| 1790 | } |
| 1791 | case IP_SET_OP_GET_BYINDEX: { |
| 1792 | struct ip_set_req_get_set *req_get = data; |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1793 | struct ip_set *set; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1794 | |
| 1795 | if (*len != sizeof(struct ip_set_req_get_set) || |
| 1796 | req_get->set.index >= ip_set_max) { |
| 1797 | ret = -EINVAL; |
| 1798 | goto done; |
| 1799 | } |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 1800 | nfnl_lock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1801 | set = nfnl_set(req_get->set.index); |
| 1802 | strncpy(req_get->set.name, set ? set->name : "", |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1803 | IPSET_MAXNAMELEN); |
Pablo Neira Ayuso | c14b78e | 2013-02-05 01:50:26 +0100 | [diff] [blame] | 1804 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1805 | goto copy; |
| 1806 | } |
| 1807 | default: |
| 1808 | ret = -EBADMSG; |
| 1809 | goto done; |
| 1810 | } /* end of switch(op) */ |
| 1811 | |
| 1812 | copy: |
| 1813 | ret = copy_to_user(user, data, copylen); |
| 1814 | |
| 1815 | done: |
| 1816 | vfree(data); |
| 1817 | if (ret > 0) |
| 1818 | ret = 0; |
| 1819 | return ret; |
| 1820 | } |
| 1821 | |
| 1822 | static struct nf_sockopt_ops so_set __read_mostly = { |
| 1823 | .pf = PF_INET, |
| 1824 | .get_optmin = SO_IP_SET, |
| 1825 | .get_optmax = SO_IP_SET + 1, |
| 1826 | .get = &ip_set_sockfn_get, |
| 1827 | .owner = THIS_MODULE, |
| 1828 | }; |
| 1829 | |
| 1830 | static int __init |
| 1831 | ip_set_init(void) |
| 1832 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1833 | struct ip_set **list; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1834 | int ret; |
| 1835 | |
| 1836 | if (max_sets) |
| 1837 | ip_set_max = max_sets; |
| 1838 | if (ip_set_max >= IPSET_INVALID_ID) |
| 1839 | ip_set_max = IPSET_INVALID_ID - 1; |
| 1840 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1841 | list = kzalloc(sizeof(struct ip_set *) * ip_set_max, GFP_KERNEL); |
| 1842 | if (!list) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1843 | return -ENOMEM; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1844 | |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1845 | rcu_assign_pointer(ip_set_list, list); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1846 | ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); |
| 1847 | if (ret != 0) { |
| 1848 | pr_err("ip_set: cannot register with nfnetlink.\n"); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1849 | kfree(list); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1850 | return ret; |
| 1851 | } |
| 1852 | ret = nf_register_sockopt(&so_set); |
| 1853 | if (ret != 0) { |
| 1854 | pr_err("SO_SET registry failed: %d\n", ret); |
| 1855 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1856 | kfree(list); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1857 | return ret; |
| 1858 | } |
| 1859 | |
| 1860 | pr_notice("ip_set: protocol %u\n", IPSET_PROTOCOL); |
| 1861 | return 0; |
| 1862 | } |
| 1863 | |
| 1864 | static void __exit |
| 1865 | ip_set_fini(void) |
| 1866 | { |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1867 | struct ip_set **list = rcu_dereference_protected(ip_set_list, 1); |
| 1868 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1869 | /* There can't be any existing set */ |
| 1870 | nf_unregister_sockopt(&so_set); |
| 1871 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); |
Jozsef Kadlecsik | 9076aea | 2012-11-27 09:58:09 +0000 | [diff] [blame] | 1872 | kfree(list); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1873 | pr_debug("these are the famous last words\n"); |
| 1874 | } |
| 1875 | |
| 1876 | module_init(ip_set_init); |
| 1877 | module_exit(ip_set_fini); |