Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 1 | /* |
| 2 | * NETLINK Generic Netlink Family |
| 3 | * |
| 4 | * Authors: Jamal Hadi Salim |
| 5 | * Thomas Graf <tgraf@suug.ch> |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 6 | * Johannes Berg <johannes@sipsolutions.net> |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 7 | */ |
| 8 | |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 9 | #include <linux/module.h> |
| 10 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 11 | #include <linux/slab.h> |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 12 | #include <linux/errno.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/socket.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <linux/skbuff.h> |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 17 | #include <linux/mutex.h> |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 18 | #include <linux/bitmap.h> |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 19 | #include <linux/rwsem.h> |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 20 | #include <net/sock.h> |
| 21 | #include <net/genetlink.h> |
| 22 | |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 23 | static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */ |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 24 | static DECLARE_RWSEM(cb_lock); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 25 | |
Johannes Berg | ee1c2442 | 2015-01-16 11:37:14 +0100 | [diff] [blame] | 26 | atomic_t genl_sk_destructing_cnt = ATOMIC_INIT(0); |
| 27 | DECLARE_WAIT_QUEUE_HEAD(genl_sk_destructing_waitq); |
| 28 | |
James Chapman | f408e0c | 2010-04-02 06:19:05 +0000 | [diff] [blame] | 29 | void genl_lock(void) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 30 | { |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 31 | mutex_lock(&genl_mutex); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 32 | } |
James Chapman | f408e0c | 2010-04-02 06:19:05 +0000 | [diff] [blame] | 33 | EXPORT_SYMBOL(genl_lock); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 34 | |
James Chapman | f408e0c | 2010-04-02 06:19:05 +0000 | [diff] [blame] | 35 | void genl_unlock(void) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 36 | { |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 37 | mutex_unlock(&genl_mutex); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 38 | } |
James Chapman | f408e0c | 2010-04-02 06:19:05 +0000 | [diff] [blame] | 39 | EXPORT_SYMBOL(genl_unlock); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 40 | |
WANG Cong | 320f5ea | 2012-07-24 13:44:01 +0800 | [diff] [blame] | 41 | #ifdef CONFIG_LOCKDEP |
Yaowei Bai | 61d0353 | 2015-10-08 21:28:54 +0800 | [diff] [blame] | 42 | bool lockdep_genl_is_held(void) |
Pravin B Shelar | 86b1309 | 2011-11-10 19:14:51 -0800 | [diff] [blame] | 43 | { |
| 44 | return lockdep_is_held(&genl_mutex); |
| 45 | } |
| 46 | EXPORT_SYMBOL(lockdep_genl_is_held); |
| 47 | #endif |
| 48 | |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 49 | static void genl_lock_all(void) |
| 50 | { |
| 51 | down_write(&cb_lock); |
| 52 | genl_lock(); |
| 53 | } |
| 54 | |
| 55 | static void genl_unlock_all(void) |
| 56 | { |
| 57 | genl_unlock(); |
| 58 | up_write(&cb_lock); |
| 59 | } |
| 60 | |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 61 | #define GENL_FAM_TAB_SIZE 16 |
| 62 | #define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1) |
| 63 | |
| 64 | static struct list_head family_ht[GENL_FAM_TAB_SIZE]; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 65 | /* |
| 66 | * Bitmap of multicast groups that are currently in use. |
| 67 | * |
| 68 | * To avoid an allocation at boot of just one unsigned long, |
| 69 | * declare it global instead. |
| 70 | * Bit 0 is marked as already used since group 0 is invalid. |
Johannes Berg | e5dcecb | 2013-11-19 15:19:32 +0100 | [diff] [blame] | 71 | * Bit 1 is marked as already used since the drop-monitor code |
| 72 | * abuses the API and thinks it can statically use group 1. |
| 73 | * That group will typically conflict with other groups that |
| 74 | * any proper users use. |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 75 | * Bit 16 is marked as used since it's used for generic netlink |
| 76 | * and the code no longer marks pre-reserved IDs as used. |
Johannes Berg | 2ecf753 | 2013-11-19 15:19:33 +0100 | [diff] [blame] | 77 | * Bit 17 is marked as already used since the VFS quota code |
| 78 | * also abused this API and relied on family == group ID, we |
| 79 | * cater to that by giving it a static family and group ID. |
Johannes Berg | 5e53e68 | 2013-11-24 21:09:26 +0100 | [diff] [blame] | 80 | * Bit 18 is marked as already used since the PMCRAID driver |
| 81 | * did the same thing as the VFS quota code (maybe copied?) |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 82 | */ |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 83 | static unsigned long mc_group_start = 0x3 | BIT(GENL_ID_CTRL) | |
Johannes Berg | 5e53e68 | 2013-11-24 21:09:26 +0100 | [diff] [blame] | 84 | BIT(GENL_ID_VFS_DQUOT) | |
| 85 | BIT(GENL_ID_PMCRAID); |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 86 | static unsigned long *mc_groups = &mc_group_start; |
| 87 | static unsigned long mc_groups_longs = 1; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 88 | |
Johannes Berg | c2ebb90 | 2013-11-19 15:19:36 +0100 | [diff] [blame] | 89 | static int genl_ctrl_event(int event, struct genl_family *family, |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 90 | const struct genl_multicast_group *grp, |
| 91 | int grp_id); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 92 | |
| 93 | static inline unsigned int genl_family_hash(unsigned int id) |
| 94 | { |
| 95 | return id & GENL_FAM_TAB_MASK; |
| 96 | } |
| 97 | |
| 98 | static inline struct list_head *genl_family_chain(unsigned int id) |
| 99 | { |
| 100 | return &family_ht[genl_family_hash(id)]; |
| 101 | } |
| 102 | |
| 103 | static struct genl_family *genl_family_find_byid(unsigned int id) |
| 104 | { |
| 105 | struct genl_family *f; |
| 106 | |
| 107 | list_for_each_entry(f, genl_family_chain(id), family_list) |
| 108 | if (f->id == id) |
| 109 | return f; |
| 110 | |
| 111 | return NULL; |
| 112 | } |
| 113 | |
| 114 | static struct genl_family *genl_family_find_byname(char *name) |
| 115 | { |
| 116 | struct genl_family *f; |
| 117 | int i; |
| 118 | |
| 119 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) |
| 120 | list_for_each_entry(f, genl_family_chain(i), family_list) |
| 121 | if (strcmp(f->name, name) == 0) |
| 122 | return f; |
| 123 | |
| 124 | return NULL; |
| 125 | } |
| 126 | |
Johannes Berg | f84f771 | 2013-11-14 17:14:45 +0100 | [diff] [blame] | 127 | static const struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 128 | { |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 129 | int i; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 130 | |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 131 | for (i = 0; i < family->n_ops; i++) |
| 132 | if (family->ops[i].cmd == cmd) |
| 133 | return &family->ops[i]; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 134 | |
| 135 | return NULL; |
| 136 | } |
| 137 | |
| 138 | /* Of course we are going to have problems once we hit |
| 139 | * 2^16 alive types, but that can only happen by year 2K |
| 140 | */ |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 141 | static u16 genl_generate_id(void) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 142 | { |
Krishna Kumar | 988ade6 | 2009-10-14 19:55:07 +0000 | [diff] [blame] | 143 | static u16 id_gen_idx = GENL_MIN_ID; |
| 144 | int i; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 145 | |
Krishna Kumar | 988ade6 | 2009-10-14 19:55:07 +0000 | [diff] [blame] | 146 | for (i = 0; i <= GENL_MAX_ID - GENL_MIN_ID; i++) { |
Johannes Berg | 2ecf753 | 2013-11-19 15:19:33 +0100 | [diff] [blame] | 147 | if (id_gen_idx != GENL_ID_VFS_DQUOT && |
Johannes Berg | 5e53e68 | 2013-11-24 21:09:26 +0100 | [diff] [blame] | 148 | id_gen_idx != GENL_ID_PMCRAID && |
Johannes Berg | 2ecf753 | 2013-11-19 15:19:33 +0100 | [diff] [blame] | 149 | !genl_family_find_byid(id_gen_idx)) |
Krishna Kumar | 988ade6 | 2009-10-14 19:55:07 +0000 | [diff] [blame] | 150 | return id_gen_idx; |
| 151 | if (++id_gen_idx > GENL_MAX_ID) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 152 | id_gen_idx = GENL_MIN_ID; |
Krishna Kumar | 988ade6 | 2009-10-14 19:55:07 +0000 | [diff] [blame] | 153 | } |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 154 | |
Krishna Kumar | 988ade6 | 2009-10-14 19:55:07 +0000 | [diff] [blame] | 155 | return 0; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 156 | } |
| 157 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 158 | static int genl_allocate_reserve_groups(int n_groups, int *first_id) |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 159 | { |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 160 | unsigned long *new_groups; |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 161 | int start = 0; |
| 162 | int i; |
| 163 | int id; |
| 164 | bool fits; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 165 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 166 | do { |
| 167 | if (start == 0) |
| 168 | id = find_first_zero_bit(mc_groups, |
| 169 | mc_groups_longs * |
| 170 | BITS_PER_LONG); |
| 171 | else |
| 172 | id = find_next_zero_bit(mc_groups, |
| 173 | mc_groups_longs * BITS_PER_LONG, |
| 174 | start); |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 175 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 176 | fits = true; |
| 177 | for (i = id; |
| 178 | i < min_t(int, id + n_groups, |
| 179 | mc_groups_longs * BITS_PER_LONG); |
| 180 | i++) { |
| 181 | if (test_bit(i, mc_groups)) { |
| 182 | start = i; |
| 183 | fits = false; |
| 184 | break; |
| 185 | } |
| 186 | } |
| 187 | |
David S. Miller | b8e429a | 2016-01-13 10:28:06 -0500 | [diff] [blame] | 188 | if (id + n_groups > mc_groups_longs * BITS_PER_LONG) { |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 189 | unsigned long new_longs = mc_groups_longs + |
| 190 | BITS_TO_LONGS(n_groups); |
| 191 | size_t nlen = new_longs * sizeof(unsigned long); |
| 192 | |
| 193 | if (mc_groups == &mc_group_start) { |
| 194 | new_groups = kzalloc(nlen, GFP_KERNEL); |
| 195 | if (!new_groups) |
| 196 | return -ENOMEM; |
| 197 | mc_groups = new_groups; |
| 198 | *mc_groups = mc_group_start; |
| 199 | } else { |
| 200 | new_groups = krealloc(mc_groups, nlen, |
| 201 | GFP_KERNEL); |
| 202 | if (!new_groups) |
| 203 | return -ENOMEM; |
| 204 | mc_groups = new_groups; |
| 205 | for (i = 0; i < BITS_TO_LONGS(n_groups); i++) |
| 206 | mc_groups[mc_groups_longs + i] = 0; |
| 207 | } |
| 208 | mc_groups_longs = new_longs; |
| 209 | } |
| 210 | } while (!fits); |
| 211 | |
| 212 | for (i = id; i < id + n_groups; i++) |
| 213 | set_bit(i, mc_groups); |
| 214 | *first_id = id; |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | static struct genl_family genl_ctrl; |
| 219 | |
| 220 | static int genl_validate_assign_mc_groups(struct genl_family *family) |
| 221 | { |
| 222 | int first_id; |
| 223 | int n_groups = family->n_mcgrps; |
Geert Uytterhoeven | 0f0e215 | 2013-11-23 13:01:50 +0100 | [diff] [blame] | 224 | int err = 0, i; |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 225 | bool groups_allocated = false; |
| 226 | |
| 227 | if (!n_groups) |
| 228 | return 0; |
| 229 | |
| 230 | for (i = 0; i < n_groups; i++) { |
| 231 | const struct genl_multicast_group *grp = &family->mcgrps[i]; |
| 232 | |
| 233 | if (WARN_ON(grp->name[0] == '\0')) |
| 234 | return -EINVAL; |
| 235 | if (WARN_ON(memchr(grp->name, '\0', GENL_NAMSIZ) == NULL)) |
| 236 | return -EINVAL; |
| 237 | } |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 238 | |
Johannes Berg | e5dcecb | 2013-11-19 15:19:32 +0100 | [diff] [blame] | 239 | /* special-case our own group and hacks */ |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 240 | if (family == &genl_ctrl) { |
| 241 | first_id = GENL_ID_CTRL; |
| 242 | BUG_ON(n_groups != 1); |
| 243 | } else if (strcmp(family->name, "NET_DM") == 0) { |
| 244 | first_id = 1; |
| 245 | BUG_ON(n_groups != 1); |
Johannes Berg | 5e53e68 | 2013-11-24 21:09:26 +0100 | [diff] [blame] | 246 | } else if (family->id == GENL_ID_VFS_DQUOT) { |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 247 | first_id = GENL_ID_VFS_DQUOT; |
| 248 | BUG_ON(n_groups != 1); |
Johannes Berg | 5e53e68 | 2013-11-24 21:09:26 +0100 | [diff] [blame] | 249 | } else if (family->id == GENL_ID_PMCRAID) { |
| 250 | first_id = GENL_ID_PMCRAID; |
| 251 | BUG_ON(n_groups != 1); |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 252 | } else { |
| 253 | groups_allocated = true; |
| 254 | err = genl_allocate_reserve_groups(n_groups, &first_id); |
| 255 | if (err) |
| 256 | return err; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 257 | } |
| 258 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 259 | family->mcgrp_offset = first_id; |
| 260 | |
| 261 | /* if still initializing, can't and don't need to to realloc bitmaps */ |
| 262 | if (!init_net.genl_sock) |
| 263 | return 0; |
| 264 | |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 265 | if (family->netnsok) { |
| 266 | struct net *net; |
| 267 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 268 | netlink_table_grab(); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 269 | rcu_read_lock(); |
| 270 | for_each_net_rcu(net) { |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 271 | err = __netlink_change_ngroups(net->genl_sock, |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 272 | mc_groups_longs * BITS_PER_LONG); |
| 273 | if (err) { |
| 274 | /* |
| 275 | * No need to roll back, can only fail if |
| 276 | * memory allocation fails and then the |
| 277 | * number of _possible_ groups has been |
| 278 | * increased on some sockets which is ok. |
| 279 | */ |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 280 | break; |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 281 | } |
| 282 | } |
| 283 | rcu_read_unlock(); |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 284 | netlink_table_ungrab(); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 285 | } else { |
| 286 | err = netlink_change_ngroups(init_net.genl_sock, |
| 287 | mc_groups_longs * BITS_PER_LONG); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 288 | } |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 289 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 290 | if (groups_allocated && err) { |
| 291 | for (i = 0; i < family->n_mcgrps; i++) |
| 292 | clear_bit(family->mcgrp_offset + i, mc_groups); |
| 293 | } |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 294 | |
Thomas Graf | 79d310d | 2007-07-24 15:34:53 -0700 | [diff] [blame] | 295 | return err; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 296 | } |
Thomas Graf | 79dc4386 | 2007-07-24 15:32:46 -0700 | [diff] [blame] | 297 | |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 298 | static void genl_unregister_mc_groups(struct genl_family *family) |
| 299 | { |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 300 | struct net *net; |
| 301 | int i; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 302 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 303 | netlink_table_grab(); |
| 304 | rcu_read_lock(); |
| 305 | for_each_net_rcu(net) { |
| 306 | for (i = 0; i < family->n_mcgrps; i++) |
| 307 | __netlink_clear_multicast_users( |
| 308 | net->genl_sock, family->mcgrp_offset + i); |
| 309 | } |
| 310 | rcu_read_unlock(); |
| 311 | netlink_table_ungrab(); |
| 312 | |
| 313 | for (i = 0; i < family->n_mcgrps; i++) { |
| 314 | int grp_id = family->mcgrp_offset + i; |
| 315 | |
| 316 | if (grp_id != 1) |
| 317 | clear_bit(grp_id, mc_groups); |
| 318 | genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, family, |
| 319 | &family->mcgrps[i], grp_id); |
| 320 | } |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 321 | } |
| 322 | |
Denis ChengRq | 2f91abd | 2014-06-02 01:18:01 -0700 | [diff] [blame] | 323 | static int genl_validate_ops(const struct genl_family *family) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 324 | { |
Johannes Berg | 568508a | 2013-11-15 14:19:08 +0100 | [diff] [blame] | 325 | const struct genl_ops *ops = family->ops; |
| 326 | unsigned int n_ops = family->n_ops; |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 327 | int i, j; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 328 | |
Johannes Berg | 568508a | 2013-11-15 14:19:08 +0100 | [diff] [blame] | 329 | if (WARN_ON(n_ops && !ops)) |
| 330 | return -EINVAL; |
| 331 | |
| 332 | if (!n_ops) |
| 333 | return 0; |
| 334 | |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 335 | for (i = 0; i < n_ops; i++) { |
| 336 | if (ops[i].dumpit == NULL && ops[i].doit == NULL) |
| 337 | return -EINVAL; |
| 338 | for (j = i + 1; j < n_ops; j++) |
| 339 | if (ops[i].cmd == ops[j].cmd) |
| 340 | return -EINVAL; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 341 | } |
| 342 | |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 343 | return 0; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 344 | } |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 345 | |
| 346 | /** |
Pravin B Shelar | 33c6b1f | 2013-08-23 12:45:04 -0700 | [diff] [blame] | 347 | * __genl_register_family - register a generic netlink family |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 348 | * @family: generic netlink family |
| 349 | * |
| 350 | * Registers the specified family after validating it first. Only one |
| 351 | * family may be registered with the same family name or identifier. |
| 352 | * The family id may equal GENL_ID_GENERATE causing an unique id to |
| 353 | * be automatically generated and assigned. |
| 354 | * |
Johannes Berg | 568508a | 2013-11-15 14:19:08 +0100 | [diff] [blame] | 355 | * The family's ops array must already be assigned, you can use the |
| 356 | * genl_register_family_with_ops() helper function. |
| 357 | * |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 358 | * Return 0 on success or a negative error code. |
| 359 | */ |
Pravin B Shelar | 33c6b1f | 2013-08-23 12:45:04 -0700 | [diff] [blame] | 360 | int __genl_register_family(struct genl_family *family) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 361 | { |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 362 | int err = -EINVAL, i; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 363 | |
| 364 | if (family->id && family->id < GENL_MIN_ID) |
| 365 | goto errout; |
| 366 | |
| 367 | if (family->id > GENL_MAX_ID) |
| 368 | goto errout; |
| 369 | |
Johannes Berg | 568508a | 2013-11-15 14:19:08 +0100 | [diff] [blame] | 370 | err = genl_validate_ops(family); |
| 371 | if (err) |
| 372 | return err; |
| 373 | |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 374 | genl_lock_all(); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 375 | |
| 376 | if (genl_family_find_byname(family->name)) { |
| 377 | err = -EEXIST; |
| 378 | goto errout_locked; |
| 379 | } |
| 380 | |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 381 | if (family->id == GENL_ID_GENERATE) { |
| 382 | u16 newid = genl_generate_id(); |
| 383 | |
| 384 | if (!newid) { |
| 385 | err = -ENOMEM; |
| 386 | goto errout_locked; |
| 387 | } |
| 388 | |
| 389 | family->id = newid; |
Krishna Kumar | 93860b0 | 2009-10-14 19:54:53 +0000 | [diff] [blame] | 390 | } else if (genl_family_find_byid(family->id)) { |
| 391 | err = -EEXIST; |
| 392 | goto errout_locked; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 393 | } |
| 394 | |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 395 | if (family->maxattr && !family->parallel_ops) { |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 396 | family->attrbuf = kmalloc((family->maxattr+1) * |
| 397 | sizeof(struct nlattr *), GFP_KERNEL); |
| 398 | if (family->attrbuf == NULL) { |
| 399 | err = -ENOMEM; |
Jamal Hadi Salim | e200bd8 | 2006-02-13 15:51:24 -0800 | [diff] [blame] | 400 | goto errout_locked; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 401 | } |
| 402 | } else |
| 403 | family->attrbuf = NULL; |
| 404 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 405 | err = genl_validate_assign_mc_groups(family); |
| 406 | if (err) |
| 407 | goto errout_locked; |
| 408 | |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 409 | list_add_tail(&family->family_list, genl_family_chain(family->id)); |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 410 | genl_unlock_all(); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 411 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 412 | /* send all events */ |
| 413 | genl_ctrl_event(CTRL_CMD_NEWFAMILY, family, NULL, 0); |
| 414 | for (i = 0; i < family->n_mcgrps; i++) |
| 415 | genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, family, |
| 416 | &family->mcgrps[i], family->mcgrp_offset + i); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 417 | |
| 418 | return 0; |
| 419 | |
| 420 | errout_locked: |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 421 | genl_unlock_all(); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 422 | errout: |
| 423 | return err; |
| 424 | } |
Pravin B Shelar | 33c6b1f | 2013-08-23 12:45:04 -0700 | [diff] [blame] | 425 | EXPORT_SYMBOL(__genl_register_family); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 426 | |
| 427 | /** |
| 428 | * genl_unregister_family - unregister generic netlink family |
| 429 | * @family: generic netlink family |
| 430 | * |
| 431 | * Unregisters the specified family. |
| 432 | * |
| 433 | * Returns 0 on success or a negative error code. |
| 434 | */ |
| 435 | int genl_unregister_family(struct genl_family *family) |
| 436 | { |
| 437 | struct genl_family *rc; |
| 438 | |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 439 | genl_lock_all(); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 440 | |
| 441 | list_for_each_entry(rc, genl_family_chain(family->id), family_list) { |
| 442 | if (family->id != rc->id || strcmp(rc->name, family->name)) |
| 443 | continue; |
| 444 | |
Johannes Berg | ee1c2442 | 2015-01-16 11:37:14 +0100 | [diff] [blame] | 445 | genl_unregister_mc_groups(family); |
| 446 | |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 447 | list_del(&rc->family_list); |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 448 | family->n_ops = 0; |
Johannes Berg | ee1c2442 | 2015-01-16 11:37:14 +0100 | [diff] [blame] | 449 | up_write(&cb_lock); |
| 450 | wait_event(genl_sk_destructing_waitq, |
| 451 | atomic_read(&genl_sk_destructing_cnt) == 0); |
| 452 | genl_unlock(); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 453 | |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 454 | kfree(family->attrbuf); |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 455 | genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL, 0); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 456 | return 0; |
| 457 | } |
| 458 | |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 459 | genl_unlock_all(); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 460 | |
| 461 | return -ENOENT; |
| 462 | } |
Changli Gao | 416c2f9 | 2010-07-25 20:46:01 +0000 | [diff] [blame] | 463 | EXPORT_SYMBOL(genl_unregister_family); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 464 | |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 465 | /** |
| 466 | * genlmsg_put - Add generic netlink header to netlink message |
| 467 | * @skb: socket buffer holding the message |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 468 | * @portid: netlink portid the message is addressed to |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 469 | * @seq: sequence number (usually the one of the sender) |
| 470 | * @family: generic netlink family |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 471 | * @flags: netlink message flags |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 472 | * @cmd: generic netlink command |
| 473 | * |
| 474 | * Returns pointer to user specific header |
| 475 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 476 | void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 477 | struct genl_family *family, int flags, u8 cmd) |
| 478 | { |
| 479 | struct nlmsghdr *nlh; |
| 480 | struct genlmsghdr *hdr; |
| 481 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 482 | nlh = nlmsg_put(skb, portid, seq, family->id, GENL_HDRLEN + |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 483 | family->hdrsize, flags); |
| 484 | if (nlh == NULL) |
| 485 | return NULL; |
| 486 | |
| 487 | hdr = nlmsg_data(nlh); |
| 488 | hdr->cmd = cmd; |
| 489 | hdr->version = family->version; |
| 490 | hdr->reserved = 0; |
| 491 | |
| 492 | return (char *) hdr + GENL_HDRLEN; |
| 493 | } |
| 494 | EXPORT_SYMBOL(genlmsg_put); |
| 495 | |
Tom Herbert | fc9e50f | 2015-12-15 15:41:37 -0800 | [diff] [blame] | 496 | static int genl_lock_start(struct netlink_callback *cb) |
| 497 | { |
| 498 | /* our ops are always const - netlink API doesn't propagate that */ |
| 499 | const struct genl_ops *ops = cb->data; |
| 500 | int rc = 0; |
| 501 | |
| 502 | if (ops->start) { |
| 503 | genl_lock(); |
| 504 | rc = ops->start(cb); |
| 505 | genl_unlock(); |
| 506 | } |
| 507 | return rc; |
| 508 | } |
| 509 | |
Pravin B Shelar | 9b96309 | 2013-08-23 12:44:55 -0700 | [diff] [blame] | 510 | static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb) |
| 511 | { |
Johannes Berg | f84f771 | 2013-11-14 17:14:45 +0100 | [diff] [blame] | 512 | /* our ops are always const - netlink API doesn't propagate that */ |
| 513 | const struct genl_ops *ops = cb->data; |
Pravin B Shelar | 9b96309 | 2013-08-23 12:44:55 -0700 | [diff] [blame] | 514 | int rc; |
| 515 | |
| 516 | genl_lock(); |
| 517 | rc = ops->dumpit(skb, cb); |
| 518 | genl_unlock(); |
| 519 | return rc; |
| 520 | } |
| 521 | |
| 522 | static int genl_lock_done(struct netlink_callback *cb) |
| 523 | { |
Johannes Berg | f84f771 | 2013-11-14 17:14:45 +0100 | [diff] [blame] | 524 | /* our ops are always const - netlink API doesn't propagate that */ |
| 525 | const struct genl_ops *ops = cb->data; |
Pravin B Shelar | 9b96309 | 2013-08-23 12:44:55 -0700 | [diff] [blame] | 526 | int rc = 0; |
| 527 | |
| 528 | if (ops->done) { |
| 529 | genl_lock(); |
| 530 | rc = ops->done(cb); |
| 531 | genl_unlock(); |
| 532 | } |
| 533 | return rc; |
| 534 | } |
| 535 | |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 536 | static int genl_family_rcv_msg(struct genl_family *family, |
| 537 | struct sk_buff *skb, |
| 538 | struct nlmsghdr *nlh) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 539 | { |
Johannes Berg | f84f771 | 2013-11-14 17:14:45 +0100 | [diff] [blame] | 540 | const struct genl_ops *ops; |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 541 | struct net *net = sock_net(skb->sk); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 542 | struct genl_info info; |
| 543 | struct genlmsghdr *hdr = nlmsg_data(nlh); |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 544 | struct nlattr **attrbuf; |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 545 | int hdrlen, err; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 546 | |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 547 | /* this family doesn't exist in this netns */ |
| 548 | if (!family->netnsok && !net_eq(net, &init_net)) |
| 549 | return -ENOENT; |
| 550 | |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 551 | hdrlen = GENL_HDRLEN + family->hdrsize; |
| 552 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 553 | return -EINVAL; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 554 | |
| 555 | ops = genl_get_cmd(hdr->cmd, family); |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 556 | if (ops == NULL) |
| 557 | return -EOPNOTSUPP; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 558 | |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 559 | if ((ops->flags & GENL_ADMIN_PERM) && |
Eric W. Biederman | 90f62cf | 2014-04-23 14:29:27 -0700 | [diff] [blame] | 560 | !netlink_capable(skb, CAP_NET_ADMIN)) |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 561 | return -EPERM; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 562 | |
Tycho Andersen | 4a92602 | 2016-02-05 09:20:52 -0700 | [diff] [blame] | 563 | if ((ops->flags & GENL_UNS_ADMIN_PERM) && |
| 564 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
| 565 | return -EPERM; |
| 566 | |
Pablo Neira | e1ee367 | 2013-07-29 12:30:04 +0200 | [diff] [blame] | 567 | if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) { |
Pravin B Shelar | 9b96309 | 2013-08-23 12:44:55 -0700 | [diff] [blame] | 568 | int rc; |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 569 | |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 570 | if (ops->dumpit == NULL) |
| 571 | return -EOPNOTSUPP; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 572 | |
Pravin B Shelar | 9b96309 | 2013-08-23 12:44:55 -0700 | [diff] [blame] | 573 | if (!family->parallel_ops) { |
| 574 | struct netlink_dump_control c = { |
Pravin B Shelar | 33c6b1f | 2013-08-23 12:45:04 -0700 | [diff] [blame] | 575 | .module = family->module, |
Johannes Berg | f84f771 | 2013-11-14 17:14:45 +0100 | [diff] [blame] | 576 | /* we have const, but the netlink API doesn't */ |
| 577 | .data = (void *)ops, |
Tom Herbert | fc9e50f | 2015-12-15 15:41:37 -0800 | [diff] [blame] | 578 | .start = genl_lock_start, |
Pravin B Shelar | 9b96309 | 2013-08-23 12:44:55 -0700 | [diff] [blame] | 579 | .dump = genl_lock_dumpit, |
| 580 | .done = genl_lock_done, |
| 581 | }; |
| 582 | |
| 583 | genl_unlock(); |
Pravin B Shelar | 33c6b1f | 2013-08-23 12:45:04 -0700 | [diff] [blame] | 584 | rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); |
Pravin B Shelar | 9b96309 | 2013-08-23 12:44:55 -0700 | [diff] [blame] | 585 | genl_lock(); |
| 586 | |
| 587 | } else { |
| 588 | struct netlink_dump_control c = { |
Pravin B Shelar | 33c6b1f | 2013-08-23 12:45:04 -0700 | [diff] [blame] | 589 | .module = family->module, |
Tom Herbert | fc9e50f | 2015-12-15 15:41:37 -0800 | [diff] [blame] | 590 | .start = ops->start, |
Pravin B Shelar | 9b96309 | 2013-08-23 12:44:55 -0700 | [diff] [blame] | 591 | .dump = ops->dumpit, |
| 592 | .done = ops->done, |
| 593 | }; |
| 594 | |
Pravin B Shelar | 33c6b1f | 2013-08-23 12:45:04 -0700 | [diff] [blame] | 595 | rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c); |
Pravin B Shelar | 9b96309 | 2013-08-23 12:44:55 -0700 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | return rc; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 599 | } |
| 600 | |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 601 | if (ops->doit == NULL) |
| 602 | return -EOPNOTSUPP; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 603 | |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 604 | if (family->maxattr && family->parallel_ops) { |
| 605 | attrbuf = kmalloc((family->maxattr+1) * |
| 606 | sizeof(struct nlattr *), GFP_KERNEL); |
| 607 | if (attrbuf == NULL) |
| 608 | return -ENOMEM; |
| 609 | } else |
| 610 | attrbuf = family->attrbuf; |
| 611 | |
| 612 | if (attrbuf) { |
| 613 | err = nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr, |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 614 | ops->policy); |
| 615 | if (err < 0) |
Wei Yongjun | 50754d21 | 2013-04-26 15:34:16 +0000 | [diff] [blame] | 616 | goto out; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 617 | } |
| 618 | |
| 619 | info.snd_seq = nlh->nlmsg_seq; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 620 | info.snd_portid = NETLINK_CB(skb).portid; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 621 | info.nlhdr = nlh; |
| 622 | info.genlhdr = nlmsg_data(nlh); |
| 623 | info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN; |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 624 | info.attrs = attrbuf; |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 625 | genl_info_net_set(&info, net); |
Johannes Berg | ff4c92d | 2010-10-04 21:14:03 +0200 | [diff] [blame] | 626 | memset(&info.user_ptr, 0, sizeof(info.user_ptr)); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 627 | |
Johannes Berg | ff4c92d | 2010-10-04 21:14:03 +0200 | [diff] [blame] | 628 | if (family->pre_doit) { |
| 629 | err = family->pre_doit(ops, skb, &info); |
| 630 | if (err) |
Wei Yongjun | 50754d21 | 2013-04-26 15:34:16 +0000 | [diff] [blame] | 631 | goto out; |
Johannes Berg | ff4c92d | 2010-10-04 21:14:03 +0200 | [diff] [blame] | 632 | } |
| 633 | |
| 634 | err = ops->doit(skb, &info); |
| 635 | |
| 636 | if (family->post_doit) |
| 637 | family->post_doit(ops, skb, &info); |
| 638 | |
Wei Yongjun | 50754d21 | 2013-04-26 15:34:16 +0000 | [diff] [blame] | 639 | out: |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 640 | if (family->parallel_ops) |
| 641 | kfree(attrbuf); |
| 642 | |
| 643 | return err; |
| 644 | } |
| 645 | |
| 646 | static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 647 | { |
| 648 | struct genl_family *family; |
| 649 | int err; |
| 650 | |
| 651 | family = genl_family_find_byid(nlh->nlmsg_type); |
| 652 | if (family == NULL) |
| 653 | return -ENOENT; |
| 654 | |
| 655 | if (!family->parallel_ops) |
| 656 | genl_lock(); |
| 657 | |
| 658 | err = genl_family_rcv_msg(family, skb, nlh); |
| 659 | |
| 660 | if (!family->parallel_ops) |
| 661 | genl_unlock(); |
| 662 | |
Johannes Berg | ff4c92d | 2010-10-04 21:14:03 +0200 | [diff] [blame] | 663 | return err; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 664 | } |
| 665 | |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 666 | static void genl_rcv(struct sk_buff *skb) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 667 | { |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 668 | down_read(&cb_lock); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 669 | netlink_rcv_skb(skb, &genl_rcv_msg); |
Pravin B Shelar | def3117 | 2013-04-23 07:48:30 +0000 | [diff] [blame] | 670 | up_read(&cb_lock); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 671 | } |
| 672 | |
| 673 | /************************************************************************** |
| 674 | * Controller |
| 675 | **************************************************************************/ |
| 676 | |
Thomas Graf | 17c157c | 2006-11-14 19:46:02 -0800 | [diff] [blame] | 677 | static struct genl_family genl_ctrl = { |
| 678 | .id = GENL_ID_CTRL, |
| 679 | .name = "nlctrl", |
Jamal Hadi Salim | 334c29a | 2006-12-04 19:31:51 -0800 | [diff] [blame] | 680 | .version = 0x2, |
Thomas Graf | 17c157c | 2006-11-14 19:46:02 -0800 | [diff] [blame] | 681 | .maxattr = CTRL_ATTR_MAX, |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 682 | .netnsok = true, |
Thomas Graf | 17c157c | 2006-11-14 19:46:02 -0800 | [diff] [blame] | 683 | }; |
| 684 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 685 | static int ctrl_fill_info(struct genl_family *family, u32 portid, u32 seq, |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 686 | u32 flags, struct sk_buff *skb, u8 cmd) |
| 687 | { |
| 688 | void *hdr; |
| 689 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 690 | hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 691 | if (hdr == NULL) |
| 692 | return -1; |
| 693 | |
David S. Miller | 444653f | 2012-03-29 23:25:11 -0400 | [diff] [blame] | 694 | if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) || |
| 695 | nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id) || |
| 696 | nla_put_u32(skb, CTRL_ATTR_VERSION, family->version) || |
| 697 | nla_put_u32(skb, CTRL_ATTR_HDRSIZE, family->hdrsize) || |
| 698 | nla_put_u32(skb, CTRL_ATTR_MAXATTR, family->maxattr)) |
| 699 | goto nla_put_failure; |
Thomas Graf | eb32811 | 2006-09-18 00:01:59 -0700 | [diff] [blame] | 700 | |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 701 | if (family->n_ops) { |
Thomas Graf | e94ef68 | 2006-11-23 11:44:37 -0800 | [diff] [blame] | 702 | struct nlattr *nla_ops; |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 703 | int i; |
Thomas Graf | eb32811 | 2006-09-18 00:01:59 -0700 | [diff] [blame] | 704 | |
Thomas Graf | e94ef68 | 2006-11-23 11:44:37 -0800 | [diff] [blame] | 705 | nla_ops = nla_nest_start(skb, CTRL_ATTR_OPS); |
| 706 | if (nla_ops == NULL) |
Thomas Graf | eb32811 | 2006-09-18 00:01:59 -0700 | [diff] [blame] | 707 | goto nla_put_failure; |
| 708 | |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 709 | for (i = 0; i < family->n_ops; i++) { |
Thomas Graf | e94ef68 | 2006-11-23 11:44:37 -0800 | [diff] [blame] | 710 | struct nlattr *nest; |
Johannes Berg | f84f771 | 2013-11-14 17:14:45 +0100 | [diff] [blame] | 711 | const struct genl_ops *ops = &family->ops[i]; |
Johannes Berg | 029b234 | 2013-11-18 20:54:58 +0100 | [diff] [blame] | 712 | u32 op_flags = ops->flags; |
Johannes Berg | f84f771 | 2013-11-14 17:14:45 +0100 | [diff] [blame] | 713 | |
| 714 | if (ops->dumpit) |
Johannes Berg | 029b234 | 2013-11-18 20:54:58 +0100 | [diff] [blame] | 715 | op_flags |= GENL_CMD_CAP_DUMP; |
Johannes Berg | f84f771 | 2013-11-14 17:14:45 +0100 | [diff] [blame] | 716 | if (ops->doit) |
Johannes Berg | 029b234 | 2013-11-18 20:54:58 +0100 | [diff] [blame] | 717 | op_flags |= GENL_CMD_CAP_DO; |
Johannes Berg | f84f771 | 2013-11-14 17:14:45 +0100 | [diff] [blame] | 718 | if (ops->policy) |
Johannes Berg | 029b234 | 2013-11-18 20:54:58 +0100 | [diff] [blame] | 719 | op_flags |= GENL_CMD_CAP_HASPOL; |
Thomas Graf | eb32811 | 2006-09-18 00:01:59 -0700 | [diff] [blame] | 720 | |
Johannes Berg | d91824c | 2013-11-14 17:14:44 +0100 | [diff] [blame] | 721 | nest = nla_nest_start(skb, i + 1); |
Thomas Graf | e94ef68 | 2006-11-23 11:44:37 -0800 | [diff] [blame] | 722 | if (nest == NULL) |
| 723 | goto nla_put_failure; |
Thomas Graf | eb32811 | 2006-09-18 00:01:59 -0700 | [diff] [blame] | 724 | |
David S. Miller | 444653f | 2012-03-29 23:25:11 -0400 | [diff] [blame] | 725 | if (nla_put_u32(skb, CTRL_ATTR_OP_ID, ops->cmd) || |
Johannes Berg | 029b234 | 2013-11-18 20:54:58 +0100 | [diff] [blame] | 726 | nla_put_u32(skb, CTRL_ATTR_OP_FLAGS, op_flags)) |
David S. Miller | 444653f | 2012-03-29 23:25:11 -0400 | [diff] [blame] | 727 | goto nla_put_failure; |
Thomas Graf | eb32811 | 2006-09-18 00:01:59 -0700 | [diff] [blame] | 728 | |
Thomas Graf | e94ef68 | 2006-11-23 11:44:37 -0800 | [diff] [blame] | 729 | nla_nest_end(skb, nest); |
| 730 | } |
| 731 | |
| 732 | nla_nest_end(skb, nla_ops); |
Thomas Graf | eb32811 | 2006-09-18 00:01:59 -0700 | [diff] [blame] | 733 | } |
| 734 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 735 | if (family->n_mcgrps) { |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 736 | struct nlattr *nla_grps; |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 737 | int i; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 738 | |
| 739 | nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS); |
| 740 | if (nla_grps == NULL) |
| 741 | goto nla_put_failure; |
| 742 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 743 | for (i = 0; i < family->n_mcgrps; i++) { |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 744 | struct nlattr *nest; |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 745 | const struct genl_multicast_group *grp; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 746 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 747 | grp = &family->mcgrps[i]; |
| 748 | |
| 749 | nest = nla_nest_start(skb, i + 1); |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 750 | if (nest == NULL) |
| 751 | goto nla_put_failure; |
| 752 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 753 | if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, |
| 754 | family->mcgrp_offset + i) || |
David S. Miller | 444653f | 2012-03-29 23:25:11 -0400 | [diff] [blame] | 755 | nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME, |
| 756 | grp->name)) |
| 757 | goto nla_put_failure; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 758 | |
| 759 | nla_nest_end(skb, nest); |
| 760 | } |
| 761 | nla_nest_end(skb, nla_grps); |
| 762 | } |
| 763 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 764 | genlmsg_end(skb, hdr); |
| 765 | return 0; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 766 | |
| 767 | nla_put_failure: |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 768 | genlmsg_cancel(skb, hdr); |
| 769 | return -EMSGSIZE; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 770 | } |
| 771 | |
Johannes Berg | c2ebb90 | 2013-11-19 15:19:36 +0100 | [diff] [blame] | 772 | static int ctrl_fill_mcgrp_info(struct genl_family *family, |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 773 | const struct genl_multicast_group *grp, |
| 774 | int grp_id, u32 portid, u32 seq, u32 flags, |
| 775 | struct sk_buff *skb, u8 cmd) |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 776 | { |
| 777 | void *hdr; |
| 778 | struct nlattr *nla_grps; |
| 779 | struct nlattr *nest; |
| 780 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 781 | hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd); |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 782 | if (hdr == NULL) |
| 783 | return -1; |
| 784 | |
Johannes Berg | c2ebb90 | 2013-11-19 15:19:36 +0100 | [diff] [blame] | 785 | if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) || |
| 786 | nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id)) |
David S. Miller | 444653f | 2012-03-29 23:25:11 -0400 | [diff] [blame] | 787 | goto nla_put_failure; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 788 | |
| 789 | nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS); |
| 790 | if (nla_grps == NULL) |
| 791 | goto nla_put_failure; |
| 792 | |
| 793 | nest = nla_nest_start(skb, 1); |
| 794 | if (nest == NULL) |
| 795 | goto nla_put_failure; |
| 796 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 797 | if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, grp_id) || |
David S. Miller | 444653f | 2012-03-29 23:25:11 -0400 | [diff] [blame] | 798 | nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME, |
| 799 | grp->name)) |
| 800 | goto nla_put_failure; |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 801 | |
| 802 | nla_nest_end(skb, nest); |
| 803 | nla_nest_end(skb, nla_grps); |
| 804 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 805 | genlmsg_end(skb, hdr); |
| 806 | return 0; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 807 | |
| 808 | nla_put_failure: |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 809 | genlmsg_cancel(skb, hdr); |
| 810 | return -EMSGSIZE; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 811 | } |
| 812 | |
| 813 | static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb) |
| 814 | { |
| 815 | |
| 816 | int i, n = 0; |
| 817 | struct genl_family *rt; |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 818 | struct net *net = sock_net(skb->sk); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 819 | int chains_to_skip = cb->args[0]; |
| 820 | int fams_to_skip = cb->args[1]; |
| 821 | |
Samir Bellabes | e1d5a01 | 2010-01-07 22:10:56 +0000 | [diff] [blame] | 822 | for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) { |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 823 | n = 0; |
| 824 | list_for_each_entry(rt, genl_family_chain(i), family_list) { |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 825 | if (!rt->netnsok && !net_eq(net, &init_net)) |
| 826 | continue; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 827 | if (++n < fams_to_skip) |
| 828 | continue; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 829 | if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid, |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 830 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 831 | skb, CTRL_CMD_NEWFAMILY) < 0) |
| 832 | goto errout; |
| 833 | } |
| 834 | |
| 835 | fams_to_skip = 0; |
| 836 | } |
| 837 | |
| 838 | errout: |
| 839 | cb->args[0] = i; |
| 840 | cb->args[1] = n; |
| 841 | |
| 842 | return skb->len; |
| 843 | } |
| 844 | |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 845 | static struct sk_buff *ctrl_build_family_msg(struct genl_family *family, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 846 | u32 portid, int seq, u8 cmd) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 847 | { |
| 848 | struct sk_buff *skb; |
| 849 | int err; |
| 850 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 851 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 852 | if (skb == NULL) |
| 853 | return ERR_PTR(-ENOBUFS); |
| 854 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 855 | err = ctrl_fill_info(family, portid, seq, 0, skb, cmd); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 856 | if (err < 0) { |
| 857 | nlmsg_free(skb); |
| 858 | return ERR_PTR(err); |
| 859 | } |
| 860 | |
| 861 | return skb; |
| 862 | } |
| 863 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 864 | static struct sk_buff * |
| 865 | ctrl_build_mcgrp_msg(struct genl_family *family, |
| 866 | const struct genl_multicast_group *grp, |
| 867 | int grp_id, u32 portid, int seq, u8 cmd) |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 868 | { |
| 869 | struct sk_buff *skb; |
| 870 | int err; |
| 871 | |
| 872 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 873 | if (skb == NULL) |
| 874 | return ERR_PTR(-ENOBUFS); |
| 875 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 876 | err = ctrl_fill_mcgrp_info(family, grp, grp_id, portid, |
| 877 | seq, 0, skb, cmd); |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 878 | if (err < 0) { |
| 879 | nlmsg_free(skb); |
| 880 | return ERR_PTR(err); |
| 881 | } |
| 882 | |
| 883 | return skb; |
| 884 | } |
| 885 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 886 | static const struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = { |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 887 | [CTRL_ATTR_FAMILY_ID] = { .type = NLA_U16 }, |
Thomas Graf | 5176f91 | 2006-08-26 20:13:18 -0700 | [diff] [blame] | 888 | [CTRL_ATTR_FAMILY_NAME] = { .type = NLA_NUL_STRING, |
| 889 | .len = GENL_NAMSIZ - 1 }, |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 890 | }; |
| 891 | |
| 892 | static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info) |
| 893 | { |
| 894 | struct sk_buff *msg; |
| 895 | struct genl_family *res = NULL; |
| 896 | int err = -EINVAL; |
| 897 | |
| 898 | if (info->attrs[CTRL_ATTR_FAMILY_ID]) { |
| 899 | u16 id = nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID]); |
| 900 | res = genl_family_find_byid(id); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 901 | err = -ENOENT; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 902 | } |
| 903 | |
| 904 | if (info->attrs[CTRL_ATTR_FAMILY_NAME]) { |
Thomas Graf | 5176f91 | 2006-08-26 20:13:18 -0700 | [diff] [blame] | 905 | char *name; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 906 | |
Thomas Graf | 5176f91 | 2006-08-26 20:13:18 -0700 | [diff] [blame] | 907 | name = nla_data(info->attrs[CTRL_ATTR_FAMILY_NAME]); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 908 | res = genl_family_find_byname(name); |
Stephen Hemminger | fa84309 | 2011-12-28 13:48:55 -0500 | [diff] [blame] | 909 | #ifdef CONFIG_MODULES |
| 910 | if (res == NULL) { |
| 911 | genl_unlock(); |
Stanislaw Gruszka | c74f2b2 | 2013-07-26 11:00:10 +0200 | [diff] [blame] | 912 | up_read(&cb_lock); |
Neil Horman | e9412c3 | 2012-05-29 09:30:41 +0000 | [diff] [blame] | 913 | request_module("net-pf-%d-proto-%d-family-%s", |
Stephen Hemminger | fa84309 | 2011-12-28 13:48:55 -0500 | [diff] [blame] | 914 | PF_NETLINK, NETLINK_GENERIC, name); |
Stanislaw Gruszka | c74f2b2 | 2013-07-26 11:00:10 +0200 | [diff] [blame] | 915 | down_read(&cb_lock); |
Stephen Hemminger | fa84309 | 2011-12-28 13:48:55 -0500 | [diff] [blame] | 916 | genl_lock(); |
| 917 | res = genl_family_find_byname(name); |
| 918 | } |
| 919 | #endif |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 920 | err = -ENOENT; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 921 | } |
| 922 | |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 923 | if (res == NULL) |
| 924 | return err; |
| 925 | |
| 926 | if (!res->netnsok && !net_eq(genl_info_net(info), &init_net)) { |
| 927 | /* family doesn't exist here */ |
| 928 | return -ENOENT; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 929 | } |
| 930 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 931 | msg = ctrl_build_family_msg(res, info->snd_portid, info->snd_seq, |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 932 | CTRL_CMD_NEWFAMILY); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 933 | if (IS_ERR(msg)) |
| 934 | return PTR_ERR(msg); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 935 | |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 936 | return genlmsg_reply(msg, info); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 937 | } |
| 938 | |
Johannes Berg | c2ebb90 | 2013-11-19 15:19:36 +0100 | [diff] [blame] | 939 | static int genl_ctrl_event(int event, struct genl_family *family, |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 940 | const struct genl_multicast_group *grp, |
| 941 | int grp_id) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 942 | { |
| 943 | struct sk_buff *msg; |
| 944 | |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 945 | /* genl is still initialising */ |
| 946 | if (!init_net.genl_sock) |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 947 | return 0; |
| 948 | |
| 949 | switch (event) { |
| 950 | case CTRL_CMD_NEWFAMILY: |
| 951 | case CTRL_CMD_DELFAMILY: |
Johannes Berg | c2ebb90 | 2013-11-19 15:19:36 +0100 | [diff] [blame] | 952 | WARN_ON(grp); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 953 | msg = ctrl_build_family_msg(family, 0, 0, event); |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 954 | break; |
| 955 | case CTRL_CMD_NEWMCAST_GRP: |
| 956 | case CTRL_CMD_DELMCAST_GRP: |
Johannes Berg | c2ebb90 | 2013-11-19 15:19:36 +0100 | [diff] [blame] | 957 | BUG_ON(!grp); |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 958 | msg = ctrl_build_mcgrp_msg(family, grp, grp_id, 0, 0, event); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 959 | break; |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 960 | default: |
| 961 | return -EINVAL; |
| 962 | } |
| 963 | |
| 964 | if (IS_ERR(msg)) |
| 965 | return PTR_ERR(msg); |
| 966 | |
| 967 | if (!family->netnsok) { |
Johannes Berg | 68eb550 | 2013-11-19 15:19:38 +0100 | [diff] [blame] | 968 | genlmsg_multicast_netns(&genl_ctrl, &init_net, msg, 0, |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 969 | 0, GFP_KERNEL); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 970 | } else { |
| 971 | rcu_read_lock(); |
Johannes Berg | 68eb550 | 2013-11-19 15:19:38 +0100 | [diff] [blame] | 972 | genlmsg_multicast_allns(&genl_ctrl, msg, 0, |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 973 | 0, GFP_ATOMIC); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 974 | rcu_read_unlock(); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 975 | } |
| 976 | |
| 977 | return 0; |
| 978 | } |
| 979 | |
Johannes Berg | c53ed74 | 2013-11-19 15:19:31 +0100 | [diff] [blame] | 980 | static struct genl_ops genl_ctrl_ops[] = { |
| 981 | { |
| 982 | .cmd = CTRL_CMD_GETFAMILY, |
| 983 | .doit = ctrl_getfamily, |
| 984 | .dumpit = ctrl_dumpfamily, |
| 985 | .policy = ctrl_policy, |
| 986 | }, |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 987 | }; |
| 988 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 989 | static struct genl_multicast_group genl_ctrl_groups[] = { |
| 990 | { .name = "notify", }, |
Johannes Berg | 2dbba6f | 2007-07-18 15:47:52 -0700 | [diff] [blame] | 991 | }; |
| 992 | |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 993 | static int genl_bind(struct net *net, int group) |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 994 | { |
Johannes Berg | 5ad6300 | 2015-01-16 11:37:13 +0100 | [diff] [blame] | 995 | int i, err = -ENOENT; |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 996 | |
| 997 | down_read(&cb_lock); |
| 998 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) { |
| 999 | struct genl_family *f; |
| 1000 | |
| 1001 | list_for_each_entry(f, genl_family_chain(i), family_list) { |
| 1002 | if (group >= f->mcgrp_offset && |
| 1003 | group < f->mcgrp_offset + f->n_mcgrps) { |
| 1004 | int fam_grp = group - f->mcgrp_offset; |
| 1005 | |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1006 | if (!f->netnsok && net != &init_net) |
| 1007 | err = -ENOENT; |
| 1008 | else if (f->mcast_bind) |
| 1009 | err = f->mcast_bind(net, fam_grp); |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 1010 | else |
| 1011 | err = 0; |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 1012 | break; |
| 1013 | } |
| 1014 | } |
| 1015 | } |
| 1016 | up_read(&cb_lock); |
| 1017 | |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 1018 | return err; |
| 1019 | } |
| 1020 | |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1021 | static void genl_unbind(struct net *net, int group) |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 1022 | { |
| 1023 | int i; |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 1024 | |
| 1025 | down_read(&cb_lock); |
| 1026 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) { |
| 1027 | struct genl_family *f; |
| 1028 | |
| 1029 | list_for_each_entry(f, genl_family_chain(i), family_list) { |
| 1030 | if (group >= f->mcgrp_offset && |
| 1031 | group < f->mcgrp_offset + f->n_mcgrps) { |
| 1032 | int fam_grp = group - f->mcgrp_offset; |
| 1033 | |
| 1034 | if (f->mcast_unbind) |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1035 | f->mcast_unbind(net, fam_grp); |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 1036 | break; |
| 1037 | } |
| 1038 | } |
| 1039 | } |
| 1040 | up_read(&cb_lock); |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 1041 | } |
| 1042 | |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1043 | static int __net_init genl_pernet_init(struct net *net) |
| 1044 | { |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1045 | struct netlink_kernel_cfg cfg = { |
| 1046 | .input = genl_rcv, |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1047 | .flags = NL_CFG_F_NONROOT_RECV, |
Johannes Berg | c380d9a | 2014-12-23 20:54:40 +0100 | [diff] [blame] | 1048 | .bind = genl_bind, |
| 1049 | .unbind = genl_unbind, |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1050 | }; |
| 1051 | |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1052 | /* we'll bump the group number right afterwards */ |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 1053 | net->genl_sock = netlink_kernel_create(net, NETLINK_GENERIC, &cfg); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1054 | |
| 1055 | if (!net->genl_sock && net_eq(net, &init_net)) |
| 1056 | panic("GENL: Cannot initialize generic netlink\n"); |
| 1057 | |
| 1058 | if (!net->genl_sock) |
| 1059 | return -ENOMEM; |
| 1060 | |
| 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | static void __net_exit genl_pernet_exit(struct net *net) |
| 1065 | { |
| 1066 | netlink_kernel_release(net->genl_sock); |
| 1067 | net->genl_sock = NULL; |
| 1068 | } |
| 1069 | |
| 1070 | static struct pernet_operations genl_pernet_ops = { |
| 1071 | .init = genl_pernet_init, |
| 1072 | .exit = genl_pernet_exit, |
| 1073 | }; |
| 1074 | |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 1075 | static int __init genl_init(void) |
| 1076 | { |
| 1077 | int i, err; |
| 1078 | |
| 1079 | for (i = 0; i < GENL_FAM_TAB_SIZE; i++) |
| 1080 | INIT_LIST_HEAD(&family_ht[i]); |
| 1081 | |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 1082 | err = genl_register_family_with_ops_groups(&genl_ctrl, genl_ctrl_ops, |
| 1083 | genl_ctrl_groups); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 1084 | if (err < 0) |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1085 | goto problem; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 1086 | |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1087 | err = register_pernet_subsys(&genl_pernet_ops); |
| 1088 | if (err) |
| 1089 | goto problem; |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 1090 | |
| 1091 | return 0; |
| 1092 | |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1093 | problem: |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 1094 | panic("GENL: Cannot register controller: %d\n", err); |
Thomas Graf | 482a852 | 2005-11-10 02:25:56 +0100 | [diff] [blame] | 1095 | } |
| 1096 | |
| 1097 | subsys_initcall(genl_init); |
| 1098 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1099 | static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group, |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1100 | gfp_t flags) |
| 1101 | { |
| 1102 | struct sk_buff *tmp; |
| 1103 | struct net *net, *prev = NULL; |
| 1104 | int err; |
| 1105 | |
| 1106 | for_each_net_rcu(net) { |
| 1107 | if (prev) { |
| 1108 | tmp = skb_clone(skb, flags); |
| 1109 | if (!tmp) { |
| 1110 | err = -ENOMEM; |
| 1111 | goto error; |
| 1112 | } |
| 1113 | err = nlmsg_multicast(prev->genl_sock, tmp, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1114 | portid, group, flags); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1115 | if (err) |
| 1116 | goto error; |
| 1117 | } |
| 1118 | |
| 1119 | prev = net; |
| 1120 | } |
| 1121 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1122 | return nlmsg_multicast(prev->genl_sock, skb, portid, group, flags); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1123 | error: |
| 1124 | kfree_skb(skb); |
| 1125 | return err; |
| 1126 | } |
| 1127 | |
Johannes Berg | 68eb550 | 2013-11-19 15:19:38 +0100 | [diff] [blame] | 1128 | int genlmsg_multicast_allns(struct genl_family *family, struct sk_buff *skb, |
| 1129 | u32 portid, unsigned int group, gfp_t flags) |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1130 | { |
Johannes Berg | 220815a | 2013-11-21 18:17:04 +0100 | [diff] [blame] | 1131 | if (WARN_ON_ONCE(group >= family->n_mcgrps)) |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 1132 | return -EINVAL; |
| 1133 | group = family->mcgrp_offset + group; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1134 | return genlmsg_mcast(skb, portid, group, flags); |
Johannes Berg | 134e637 | 2009-07-10 09:51:34 +0000 | [diff] [blame] | 1135 | } |
| 1136 | EXPORT_SYMBOL(genlmsg_multicast_allns); |
Pravin B Shelar | 263ba61 | 2011-11-10 19:14:37 -0800 | [diff] [blame] | 1137 | |
Jiri Benc | 92c14d9 | 2015-09-22 18:56:43 +0200 | [diff] [blame] | 1138 | void genl_notify(struct genl_family *family, struct sk_buff *skb, |
| 1139 | struct genl_info *info, u32 group, gfp_t flags) |
Pravin B Shelar | 263ba61 | 2011-11-10 19:14:37 -0800 | [diff] [blame] | 1140 | { |
Jiri Benc | 92c14d9 | 2015-09-22 18:56:43 +0200 | [diff] [blame] | 1141 | struct net *net = genl_info_net(info); |
Pravin B Shelar | 263ba61 | 2011-11-10 19:14:37 -0800 | [diff] [blame] | 1142 | struct sock *sk = net->genl_sock; |
| 1143 | int report = 0; |
| 1144 | |
Jiri Benc | 92c14d9 | 2015-09-22 18:56:43 +0200 | [diff] [blame] | 1145 | if (info->nlhdr) |
| 1146 | report = nlmsg_report(info->nlhdr); |
Pravin B Shelar | 263ba61 | 2011-11-10 19:14:37 -0800 | [diff] [blame] | 1147 | |
Johannes Berg | 220815a | 2013-11-21 18:17:04 +0100 | [diff] [blame] | 1148 | if (WARN_ON_ONCE(group >= family->n_mcgrps)) |
Johannes Berg | 2a94fe4 | 2013-11-19 15:19:39 +0100 | [diff] [blame] | 1149 | return; |
| 1150 | group = family->mcgrp_offset + group; |
Jiri Benc | 92c14d9 | 2015-09-22 18:56:43 +0200 | [diff] [blame] | 1151 | nlmsg_notify(sk, skb, info->snd_portid, group, report, flags); |
Pravin B Shelar | 263ba61 | 2011-11-10 19:14:37 -0800 | [diff] [blame] | 1152 | } |
| 1153 | EXPORT_SYMBOL(genl_notify); |