Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 2 | /* |
| 3 | * NETLINK Netlink attributes |
| 4 | * |
| 5 | * Authors: Thomas Graf <tgraf@suug.ch> |
| 6 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
| 7 | */ |
| 8 | |
Paul Gortmaker | 8bc3bcc | 2011-11-16 21:29:17 -0500 | [diff] [blame] | 9 | #include <linux/export.h> |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 10 | #include <linux/kernel.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/jiffies.h> |
Eric Dumazet | f0950402 | 2023-01-19 11:01:50 +0000 | [diff] [blame] | 13 | #include <linux/nospec.h> |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <net/netlink.h> |
| 18 | |
David Ahern | 6e237d0 | 2017-12-06 20:09:12 -0800 | [diff] [blame] | 19 | /* For these data types, attribute length should be exactly the given |
| 20 | * size. However, to maintain compatibility with broken commands, if the |
| 21 | * attribute length does not match the expected size a warning is emitted |
| 22 | * to the user that the command is sending invalid data and needs to be fixed. |
| 23 | */ |
David Ahern | 28033ae | 2017-11-07 21:59:40 -0800 | [diff] [blame] | 24 | static const u8 nla_attr_len[NLA_TYPE_MAX+1] = { |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 25 | [NLA_U8] = sizeof(u8), |
| 26 | [NLA_U16] = sizeof(u16), |
| 27 | [NLA_U32] = sizeof(u32), |
| 28 | [NLA_U64] = sizeof(u64), |
Julian Anastasov | 9eca2eb | 2012-08-25 22:47:57 +0000 | [diff] [blame] | 29 | [NLA_S8] = sizeof(s8), |
| 30 | [NLA_S16] = sizeof(s16), |
| 31 | [NLA_S32] = sizeof(s32), |
| 32 | [NLA_S64] = sizeof(s64), |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 33 | }; |
| 34 | |
David Ahern | 28033ae | 2017-11-07 21:59:40 -0800 | [diff] [blame] | 35 | static const u8 nla_attr_minlen[NLA_TYPE_MAX+1] = { |
David Ahern | 6e237d0 | 2017-12-06 20:09:12 -0800 | [diff] [blame] | 36 | [NLA_U8] = sizeof(u8), |
| 37 | [NLA_U16] = sizeof(u16), |
| 38 | [NLA_U32] = sizeof(u32), |
| 39 | [NLA_U64] = sizeof(u64), |
David Ahern | 28033ae | 2017-11-07 21:59:40 -0800 | [diff] [blame] | 40 | [NLA_MSECS] = sizeof(u64), |
| 41 | [NLA_NESTED] = NLA_HDRLEN, |
David Ahern | 6e237d0 | 2017-12-06 20:09:12 -0800 | [diff] [blame] | 42 | [NLA_S8] = sizeof(s8), |
| 43 | [NLA_S16] = sizeof(s16), |
| 44 | [NLA_S32] = sizeof(s32), |
| 45 | [NLA_S64] = sizeof(s64), |
David Ahern | 28033ae | 2017-11-07 21:59:40 -0800 | [diff] [blame] | 46 | }; |
| 47 | |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 48 | /* |
| 49 | * Nested policies might refer back to the original |
| 50 | * policy in some cases, and userspace could try to |
| 51 | * abuse that and recurse by nesting in the right |
| 52 | * ways. Limit recursion to avoid this problem. |
| 53 | */ |
| 54 | #define MAX_POLICY_RECURSION_DEPTH 10 |
| 55 | |
| 56 | static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype, |
| 57 | const struct nla_policy *policy, |
| 58 | unsigned int validate, |
| 59 | struct netlink_ext_ack *extack, |
| 60 | struct nlattr **tb, unsigned int depth); |
| 61 | |
Jamal Hadi Salim | 64c83d8 | 2017-07-30 13:24:49 -0400 | [diff] [blame] | 62 | static int validate_nla_bitfield32(const struct nlattr *nla, |
Johannes Berg | 47a1494 | 2020-04-30 22:13:05 +0200 | [diff] [blame] | 63 | const u32 valid_flags_mask) |
Jamal Hadi Salim | 64c83d8 | 2017-07-30 13:24:49 -0400 | [diff] [blame] | 64 | { |
| 65 | const struct nla_bitfield32 *bf = nla_data(nla); |
Jamal Hadi Salim | 64c83d8 | 2017-07-30 13:24:49 -0400 | [diff] [blame] | 66 | |
Johannes Berg | 48fde90 | 2018-09-26 11:15:31 +0200 | [diff] [blame] | 67 | if (!valid_flags_mask) |
Jamal Hadi Salim | 64c83d8 | 2017-07-30 13:24:49 -0400 | [diff] [blame] | 68 | return -EINVAL; |
| 69 | |
| 70 | /*disallow invalid bit selector */ |
Johannes Berg | 47a1494 | 2020-04-30 22:13:05 +0200 | [diff] [blame] | 71 | if (bf->selector & ~valid_flags_mask) |
Jamal Hadi Salim | 64c83d8 | 2017-07-30 13:24:49 -0400 | [diff] [blame] | 72 | return -EINVAL; |
| 73 | |
| 74 | /*disallow invalid bit values */ |
Johannes Berg | 47a1494 | 2020-04-30 22:13:05 +0200 | [diff] [blame] | 75 | if (bf->value & ~valid_flags_mask) |
Jamal Hadi Salim | 64c83d8 | 2017-07-30 13:24:49 -0400 | [diff] [blame] | 76 | return -EINVAL; |
| 77 | |
| 78 | /*disallow valid bit values that are not selected*/ |
| 79 | if (bf->value & ~bf->selector) |
| 80 | return -EINVAL; |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
Johannes Berg | 1501d13 | 2018-09-26 11:15:34 +0200 | [diff] [blame] | 85 | static int nla_validate_array(const struct nlattr *head, int len, int maxtype, |
| 86 | const struct nla_policy *policy, |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 87 | struct netlink_ext_ack *extack, |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 88 | unsigned int validate, unsigned int depth) |
Johannes Berg | 1501d13 | 2018-09-26 11:15:34 +0200 | [diff] [blame] | 89 | { |
| 90 | const struct nlattr *entry; |
| 91 | int rem; |
| 92 | |
| 93 | nla_for_each_attr(entry, head, len, rem) { |
| 94 | int ret; |
| 95 | |
| 96 | if (nla_len(entry) == 0) |
| 97 | continue; |
| 98 | |
| 99 | if (nla_len(entry) < NLA_HDRLEN) { |
Johannes Berg | 44f3625 | 2020-10-08 12:45:17 +0200 | [diff] [blame] | 100 | NL_SET_ERR_MSG_ATTR_POL(extack, entry, policy, |
| 101 | "Array element too short"); |
Johannes Berg | 1501d13 | 2018-09-26 11:15:34 +0200 | [diff] [blame] | 102 | return -ERANGE; |
| 103 | } |
| 104 | |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 105 | ret = __nla_validate_parse(nla_data(entry), nla_len(entry), |
| 106 | maxtype, policy, validate, extack, |
| 107 | NULL, depth + 1); |
Johannes Berg | 1501d13 | 2018-09-26 11:15:34 +0200 | [diff] [blame] | 108 | if (ret < 0) |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 115 | void nla_get_range_unsigned(const struct nla_policy *pt, |
| 116 | struct netlink_range_validation *range) |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 117 | { |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 118 | WARN_ON_ONCE(pt->validation_type != NLA_VALIDATE_RANGE_PTR && |
| 119 | (pt->min < 0 || pt->max < 0)); |
| 120 | |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 121 | range->min = 0; |
| 122 | |
| 123 | switch (pt->type) { |
| 124 | case NLA_U8: |
| 125 | range->max = U8_MAX; |
| 126 | break; |
| 127 | case NLA_U16: |
Florian Westphal | ecaf75f | 2022-10-31 13:34:07 +0100 | [diff] [blame] | 128 | case NLA_BE16: |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 129 | case NLA_BINARY: |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 130 | range->max = U16_MAX; |
| 131 | break; |
| 132 | case NLA_U32: |
Florian Westphal | ecaf75f | 2022-10-31 13:34:07 +0100 | [diff] [blame] | 133 | case NLA_BE32: |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 134 | range->max = U32_MAX; |
| 135 | break; |
| 136 | case NLA_U64: |
| 137 | case NLA_MSECS: |
| 138 | range->max = U64_MAX; |
| 139 | break; |
| 140 | default: |
| 141 | WARN_ON_ONCE(1); |
| 142 | return; |
| 143 | } |
| 144 | |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 145 | switch (pt->validation_type) { |
| 146 | case NLA_VALIDATE_RANGE: |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 147 | case NLA_VALIDATE_RANGE_WARN_TOO_LONG: |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 148 | range->min = pt->min; |
| 149 | range->max = pt->max; |
| 150 | break; |
| 151 | case NLA_VALIDATE_RANGE_PTR: |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 152 | *range = *pt->range; |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 153 | break; |
| 154 | case NLA_VALIDATE_MIN: |
| 155 | range->min = pt->min; |
| 156 | break; |
| 157 | case NLA_VALIDATE_MAX: |
| 158 | range->max = pt->max; |
| 159 | break; |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 160 | default: |
| 161 | break; |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 162 | } |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 163 | } |
| 164 | |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 165 | static int nla_validate_range_unsigned(const struct nla_policy *pt, |
| 166 | const struct nlattr *nla, |
| 167 | struct netlink_ext_ack *extack, |
| 168 | unsigned int validate) |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 169 | { |
| 170 | struct netlink_range_validation range; |
| 171 | u64 value; |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 172 | |
| 173 | switch (pt->type) { |
| 174 | case NLA_U8: |
| 175 | value = nla_get_u8(nla); |
| 176 | break; |
| 177 | case NLA_U16: |
Florian Westphal | ecaf75f | 2022-10-31 13:34:07 +0100 | [diff] [blame] | 178 | value = nla_get_u16(nla); |
| 179 | break; |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 180 | case NLA_U32: |
Florian Westphal | ecaf75f | 2022-10-31 13:34:07 +0100 | [diff] [blame] | 181 | value = nla_get_u32(nla); |
| 182 | break; |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 183 | case NLA_U64: |
Florian Westphal | ecaf75f | 2022-10-31 13:34:07 +0100 | [diff] [blame] | 184 | value = nla_get_u64(nla); |
Florian Westphal | 08724ef | 2022-09-05 12:09:36 +0200 | [diff] [blame] | 185 | break; |
Johannes Berg | da4063b | 2020-04-30 22:13:09 +0200 | [diff] [blame] | 186 | case NLA_MSECS: |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 187 | value = nla_get_u64(nla); |
| 188 | break; |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 189 | case NLA_BINARY: |
| 190 | value = nla_len(nla); |
| 191 | break; |
Florian Westphal | ecaf75f | 2022-10-31 13:34:07 +0100 | [diff] [blame] | 192 | case NLA_BE16: |
| 193 | value = ntohs(nla_get_be16(nla)); |
| 194 | break; |
| 195 | case NLA_BE32: |
| 196 | value = ntohl(nla_get_be32(nla)); |
| 197 | break; |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 198 | default: |
| 199 | return -EINVAL; |
| 200 | } |
| 201 | |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 202 | nla_get_range_unsigned(pt, &range); |
| 203 | |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 204 | if (pt->validation_type == NLA_VALIDATE_RANGE_WARN_TOO_LONG && |
| 205 | pt->type == NLA_BINARY && value > range.max) { |
| 206 | pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n", |
| 207 | current->comm, pt->type); |
| 208 | if (validate & NL_VALIDATE_STRICT_ATTRS) { |
Johannes Berg | 44f3625 | 2020-10-08 12:45:17 +0200 | [diff] [blame] | 209 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
| 210 | "invalid attribute length"); |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 211 | return -EINVAL; |
| 212 | } |
| 213 | |
| 214 | /* this assumes min <= max (don't validate against min) */ |
| 215 | return 0; |
| 216 | } |
| 217 | |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 218 | if (value < range.min || value > range.max) { |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 219 | bool binary = pt->type == NLA_BINARY; |
| 220 | |
| 221 | if (binary) |
Johannes Berg | 44f3625 | 2020-10-08 12:45:17 +0200 | [diff] [blame] | 222 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
| 223 | "binary attribute size out of range"); |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 224 | else |
Johannes Berg | 44f3625 | 2020-10-08 12:45:17 +0200 | [diff] [blame] | 225 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
| 226 | "integer out of range"); |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 227 | |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 228 | return -ERANGE; |
| 229 | } |
| 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 234 | void nla_get_range_signed(const struct nla_policy *pt, |
| 235 | struct netlink_range_validation_signed *range) |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 236 | { |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 237 | switch (pt->type) { |
| 238 | case NLA_S8: |
| 239 | range->min = S8_MIN; |
| 240 | range->max = S8_MAX; |
| 241 | break; |
| 242 | case NLA_S16: |
| 243 | range->min = S16_MIN; |
| 244 | range->max = S16_MAX; |
| 245 | break; |
| 246 | case NLA_S32: |
| 247 | range->min = S32_MIN; |
| 248 | range->max = S32_MAX; |
| 249 | break; |
| 250 | case NLA_S64: |
| 251 | range->min = S64_MIN; |
| 252 | range->max = S64_MAX; |
| 253 | break; |
| 254 | default: |
| 255 | WARN_ON_ONCE(1); |
| 256 | return; |
| 257 | } |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 258 | |
| 259 | switch (pt->validation_type) { |
| 260 | case NLA_VALIDATE_RANGE: |
| 261 | range->min = pt->min; |
| 262 | range->max = pt->max; |
| 263 | break; |
| 264 | case NLA_VALIDATE_RANGE_PTR: |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 265 | *range = *pt->range_signed; |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 266 | break; |
| 267 | case NLA_VALIDATE_MIN: |
| 268 | range->min = pt->min; |
| 269 | break; |
| 270 | case NLA_VALIDATE_MAX: |
| 271 | range->max = pt->max; |
| 272 | break; |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 273 | default: |
| 274 | break; |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 275 | } |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 276 | } |
| 277 | |
| 278 | static int nla_validate_int_range_signed(const struct nla_policy *pt, |
| 279 | const struct nlattr *nla, |
| 280 | struct netlink_ext_ack *extack) |
| 281 | { |
| 282 | struct netlink_range_validation_signed range; |
| 283 | s64 value; |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 284 | |
| 285 | switch (pt->type) { |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 286 | case NLA_S8: |
| 287 | value = nla_get_s8(nla); |
| 288 | break; |
| 289 | case NLA_S16: |
| 290 | value = nla_get_s16(nla); |
| 291 | break; |
| 292 | case NLA_S32: |
| 293 | value = nla_get_s32(nla); |
| 294 | break; |
| 295 | case NLA_S64: |
| 296 | value = nla_get_s64(nla); |
| 297 | break; |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 298 | default: |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 299 | return -EINVAL; |
| 300 | } |
| 301 | |
Johannes Berg | 2c28ae4 | 2020-04-30 22:13:11 +0200 | [diff] [blame] | 302 | nla_get_range_signed(pt, &range); |
| 303 | |
| 304 | if (value < range.min || value > range.max) { |
Johannes Berg | 44f3625 | 2020-10-08 12:45:17 +0200 | [diff] [blame] | 305 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
| 306 | "integer out of range"); |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 307 | return -ERANGE; |
| 308 | } |
| 309 | |
| 310 | return 0; |
| 311 | } |
| 312 | |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 313 | static int nla_validate_int_range(const struct nla_policy *pt, |
| 314 | const struct nlattr *nla, |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 315 | struct netlink_ext_ack *extack, |
| 316 | unsigned int validate) |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 317 | { |
| 318 | switch (pt->type) { |
| 319 | case NLA_U8: |
| 320 | case NLA_U16: |
| 321 | case NLA_U32: |
| 322 | case NLA_U64: |
Johannes Berg | da4063b | 2020-04-30 22:13:09 +0200 | [diff] [blame] | 323 | case NLA_MSECS: |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 324 | case NLA_BINARY: |
Florian Westphal | ecaf75f | 2022-10-31 13:34:07 +0100 | [diff] [blame] | 325 | case NLA_BE16: |
| 326 | case NLA_BE32: |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 327 | return nla_validate_range_unsigned(pt, nla, extack, validate); |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 328 | case NLA_S8: |
| 329 | case NLA_S16: |
| 330 | case NLA_S32: |
| 331 | case NLA_S64: |
| 332 | return nla_validate_int_range_signed(pt, nla, extack); |
| 333 | default: |
| 334 | WARN_ON(1); |
| 335 | return -EINVAL; |
| 336 | } |
| 337 | } |
| 338 | |
Jakub Kicinski | bdbb4e2 | 2020-10-05 15:07:38 -0700 | [diff] [blame] | 339 | static int nla_validate_mask(const struct nla_policy *pt, |
| 340 | const struct nlattr *nla, |
| 341 | struct netlink_ext_ack *extack) |
| 342 | { |
| 343 | u64 value; |
| 344 | |
| 345 | switch (pt->type) { |
| 346 | case NLA_U8: |
| 347 | value = nla_get_u8(nla); |
| 348 | break; |
| 349 | case NLA_U16: |
| 350 | value = nla_get_u16(nla); |
| 351 | break; |
| 352 | case NLA_U32: |
| 353 | value = nla_get_u32(nla); |
| 354 | break; |
| 355 | case NLA_U64: |
| 356 | value = nla_get_u64(nla); |
| 357 | break; |
| 358 | default: |
| 359 | return -EINVAL; |
| 360 | } |
| 361 | |
| 362 | if (value & ~(u64)pt->mask) { |
| 363 | NL_SET_ERR_MSG_ATTR(extack, nla, "reserved bit set"); |
| 364 | return -EINVAL; |
| 365 | } |
| 366 | |
| 367 | return 0; |
| 368 | } |
| 369 | |
Jan Engelhardt | 3654654 | 2010-11-16 09:52:32 -0800 | [diff] [blame] | 370 | static int validate_nla(const struct nlattr *nla, int maxtype, |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 371 | const struct nla_policy *policy, unsigned int validate, |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 372 | struct netlink_ext_ack *extack, unsigned int depth) |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 373 | { |
Johannes Berg | 56738f4 | 2019-04-26 14:07:30 +0200 | [diff] [blame] | 374 | u16 strict_start_type = policy[0].strict_start_type; |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 375 | const struct nla_policy *pt; |
Thomas Graf | 8f4c1f9 | 2007-09-12 14:44:36 +0200 | [diff] [blame] | 376 | int minlen = 0, attrlen = nla_len(nla), type = nla_type(nla); |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 377 | int err = -ERANGE; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 378 | |
Johannes Berg | 56738f4 | 2019-04-26 14:07:30 +0200 | [diff] [blame] | 379 | if (strict_start_type && type >= strict_start_type) |
| 380 | validate |= NL_VALIDATE_STRICT; |
| 381 | |
Thomas Graf | 8f4c1f9 | 2007-09-12 14:44:36 +0200 | [diff] [blame] | 382 | if (type <= 0 || type > maxtype) |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 383 | return 0; |
| 384 | |
Eric Dumazet | f0950402 | 2023-01-19 11:01:50 +0000 | [diff] [blame] | 385 | type = array_index_nospec(type, maxtype + 1); |
Thomas Graf | 8f4c1f9 | 2007-09-12 14:44:36 +0200 | [diff] [blame] | 386 | pt = &policy[type]; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 387 | |
| 388 | BUG_ON(pt->type > NLA_TYPE_MAX); |
| 389 | |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 390 | if (nla_attr_len[pt->type] && attrlen != nla_attr_len[pt->type]) { |
David Ahern | 6e237d0 | 2017-12-06 20:09:12 -0800 | [diff] [blame] | 391 | pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n", |
| 392 | current->comm, type); |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 393 | if (validate & NL_VALIDATE_STRICT_ATTRS) { |
Johannes Berg | 44f3625 | 2020-10-08 12:45:17 +0200 | [diff] [blame] | 394 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
| 395 | "invalid attribute length"); |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 396 | return -EINVAL; |
| 397 | } |
David Ahern | 28033ae | 2017-11-07 21:59:40 -0800 | [diff] [blame] | 398 | } |
| 399 | |
Michal Kubecek | b424e43 | 2019-05-02 16:15:10 +0200 | [diff] [blame] | 400 | if (validate & NL_VALIDATE_NESTED) { |
| 401 | if ((pt->type == NLA_NESTED || pt->type == NLA_NESTED_ARRAY) && |
| 402 | !(nla->nla_type & NLA_F_NESTED)) { |
Johannes Berg | 44f3625 | 2020-10-08 12:45:17 +0200 | [diff] [blame] | 403 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
| 404 | "NLA_F_NESTED is missing"); |
Michal Kubecek | b424e43 | 2019-05-02 16:15:10 +0200 | [diff] [blame] | 405 | return -EINVAL; |
| 406 | } |
| 407 | if (pt->type != NLA_NESTED && pt->type != NLA_NESTED_ARRAY && |
| 408 | pt->type != NLA_UNSPEC && (nla->nla_type & NLA_F_NESTED)) { |
Johannes Berg | 44f3625 | 2020-10-08 12:45:17 +0200 | [diff] [blame] | 409 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
| 410 | "NLA_F_NESTED not expected"); |
Michal Kubecek | b424e43 | 2019-05-02 16:15:10 +0200 | [diff] [blame] | 411 | return -EINVAL; |
| 412 | } |
| 413 | } |
| 414 | |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 415 | switch (pt->type) { |
Johannes Berg | 568b742 | 2018-09-17 11:57:28 +0200 | [diff] [blame] | 416 | case NLA_REJECT: |
Johannes Berg | 47a1494 | 2020-04-30 22:13:05 +0200 | [diff] [blame] | 417 | if (extack && pt->reject_message) { |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 418 | NL_SET_BAD_ATTR(extack, nla); |
Johannes Berg | 47a1494 | 2020-04-30 22:13:05 +0200 | [diff] [blame] | 419 | extack->_msg = pt->reject_message; |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 420 | return -EINVAL; |
| 421 | } |
| 422 | err = -EINVAL; |
| 423 | goto out_err; |
Johannes Berg | 568b742 | 2018-09-17 11:57:28 +0200 | [diff] [blame] | 424 | |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 425 | case NLA_FLAG: |
| 426 | if (attrlen > 0) |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 427 | goto out_err; |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 428 | break; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 429 | |
Jamal Hadi Salim | 64c83d8 | 2017-07-30 13:24:49 -0400 | [diff] [blame] | 430 | case NLA_BITFIELD32: |
| 431 | if (attrlen != sizeof(struct nla_bitfield32)) |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 432 | goto out_err; |
Jamal Hadi Salim | 64c83d8 | 2017-07-30 13:24:49 -0400 | [diff] [blame] | 433 | |
Johannes Berg | 47a1494 | 2020-04-30 22:13:05 +0200 | [diff] [blame] | 434 | err = validate_nla_bitfield32(nla, pt->bitfield32_valid); |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 435 | if (err) |
| 436 | goto out_err; |
| 437 | break; |
Jamal Hadi Salim | 64c83d8 | 2017-07-30 13:24:49 -0400 | [diff] [blame] | 438 | |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 439 | case NLA_NUL_STRING: |
| 440 | if (pt->len) |
| 441 | minlen = min_t(int, attrlen, pt->len + 1); |
| 442 | else |
| 443 | minlen = attrlen; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 444 | |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 445 | if (!minlen || memchr(nla_data(nla), '\0', minlen) == NULL) { |
| 446 | err = -EINVAL; |
| 447 | goto out_err; |
| 448 | } |
Gustavo A. R. Silva | 36f9ff9 | 2020-11-19 07:11:44 -0600 | [diff] [blame] | 449 | fallthrough; |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 450 | |
| 451 | case NLA_STRING: |
| 452 | if (attrlen < 1) |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 453 | goto out_err; |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 454 | |
| 455 | if (pt->len) { |
| 456 | char *buf = nla_data(nla); |
| 457 | |
| 458 | if (buf[attrlen - 1] == '\0') |
| 459 | attrlen--; |
| 460 | |
| 461 | if (attrlen > pt->len) |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 462 | goto out_err; |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 463 | } |
| 464 | break; |
| 465 | |
Johannes Berg | d30045a | 2007-03-23 11:37:48 -0700 | [diff] [blame] | 466 | case NLA_BINARY: |
| 467 | if (pt->len && attrlen > pt->len) |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 468 | goto out_err; |
Johannes Berg | d30045a | 2007-03-23 11:37:48 -0700 | [diff] [blame] | 469 | break; |
| 470 | |
Patrick McHardy | ea5693c | 2008-11-28 03:05:19 -0800 | [diff] [blame] | 471 | case NLA_NESTED: |
| 472 | /* a nested attributes is allowed to be empty; if its not, |
| 473 | * it must have a size of at least NLA_HDRLEN. |
| 474 | */ |
| 475 | if (attrlen == 0) |
| 476 | break; |
Johannes Berg | 9a659a35 | 2018-09-26 11:15:33 +0200 | [diff] [blame] | 477 | if (attrlen < NLA_HDRLEN) |
| 478 | goto out_err; |
Johannes Berg | 47a1494 | 2020-04-30 22:13:05 +0200 | [diff] [blame] | 479 | if (pt->nested_policy) { |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 480 | err = __nla_validate_parse(nla_data(nla), nla_len(nla), |
| 481 | pt->len, pt->nested_policy, |
| 482 | validate, extack, NULL, |
| 483 | depth + 1); |
Johannes Berg | 9a659a35 | 2018-09-26 11:15:33 +0200 | [diff] [blame] | 484 | if (err < 0) { |
| 485 | /* |
| 486 | * return directly to preserve the inner |
| 487 | * error message/attribute pointer |
| 488 | */ |
| 489 | return err; |
| 490 | } |
| 491 | } |
| 492 | break; |
Johannes Berg | 1501d13 | 2018-09-26 11:15:34 +0200 | [diff] [blame] | 493 | case NLA_NESTED_ARRAY: |
| 494 | /* a nested array attribute is allowed to be empty; if its not, |
| 495 | * it must have a size of at least NLA_HDRLEN. |
| 496 | */ |
| 497 | if (attrlen == 0) |
| 498 | break; |
| 499 | if (attrlen < NLA_HDRLEN) |
| 500 | goto out_err; |
Johannes Berg | 47a1494 | 2020-04-30 22:13:05 +0200 | [diff] [blame] | 501 | if (pt->nested_policy) { |
Johannes Berg | 1501d13 | 2018-09-26 11:15:34 +0200 | [diff] [blame] | 502 | int err; |
| 503 | |
| 504 | err = nla_validate_array(nla_data(nla), nla_len(nla), |
Johannes Berg | 47a1494 | 2020-04-30 22:13:05 +0200 | [diff] [blame] | 505 | pt->len, pt->nested_policy, |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 506 | extack, validate, depth); |
Johannes Berg | 1501d13 | 2018-09-26 11:15:34 +0200 | [diff] [blame] | 507 | if (err < 0) { |
| 508 | /* |
| 509 | * return directly to preserve the inner |
| 510 | * error message/attribute pointer |
| 511 | */ |
| 512 | return err; |
| 513 | } |
| 514 | } |
| 515 | break; |
Johannes Berg | 6f455f5 | 2019-04-26 14:07:27 +0200 | [diff] [blame] | 516 | |
| 517 | case NLA_UNSPEC: |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 518 | if (validate & NL_VALIDATE_UNSPEC) { |
| 519 | NL_SET_ERR_MSG_ATTR(extack, nla, |
| 520 | "Unsupported attribute"); |
| 521 | return -EINVAL; |
| 522 | } |
Johannes Berg | 6f455f5 | 2019-04-26 14:07:27 +0200 | [diff] [blame] | 523 | if (attrlen < pt->len) |
| 524 | goto out_err; |
| 525 | break; |
| 526 | |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 527 | default: |
| 528 | if (pt->len) |
| 529 | minlen = pt->len; |
Johannes Berg | 6f455f5 | 2019-04-26 14:07:27 +0200 | [diff] [blame] | 530 | else |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 531 | minlen = nla_attr_minlen[pt->type]; |
| 532 | |
| 533 | if (attrlen < minlen) |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 534 | goto out_err; |
Thomas Graf | a5531a5 | 2006-08-26 20:11:47 -0700 | [diff] [blame] | 535 | } |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 536 | |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 537 | /* further validation */ |
| 538 | switch (pt->validation_type) { |
| 539 | case NLA_VALIDATE_NONE: |
| 540 | /* nothing to do */ |
| 541 | break; |
Johannes Berg | d06a09b | 2020-04-30 22:13:08 +0200 | [diff] [blame] | 542 | case NLA_VALIDATE_RANGE_PTR: |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 543 | case NLA_VALIDATE_RANGE: |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 544 | case NLA_VALIDATE_RANGE_WARN_TOO_LONG: |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 545 | case NLA_VALIDATE_MIN: |
| 546 | case NLA_VALIDATE_MAX: |
Johannes Berg | 8aa26c5 | 2020-08-18 10:17:33 +0200 | [diff] [blame] | 547 | err = nla_validate_int_range(pt, nla, extack, validate); |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 548 | if (err) |
| 549 | return err; |
| 550 | break; |
Jakub Kicinski | bdbb4e2 | 2020-10-05 15:07:38 -0700 | [diff] [blame] | 551 | case NLA_VALIDATE_MASK: |
| 552 | err = nla_validate_mask(pt, nla, extack); |
| 553 | if (err) |
| 554 | return err; |
| 555 | break; |
Johannes Berg | 33188bd | 2018-09-27 11:28:36 +0200 | [diff] [blame] | 556 | case NLA_VALIDATE_FUNCTION: |
| 557 | if (pt->validate) { |
| 558 | err = pt->validate(nla, extack); |
| 559 | if (err) |
| 560 | return err; |
| 561 | } |
| 562 | break; |
Johannes Berg | 3e48be0 | 2018-09-27 11:28:35 +0200 | [diff] [blame] | 563 | } |
| 564 | |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 565 | return 0; |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 566 | out_err: |
Johannes Berg | 44f3625 | 2020-10-08 12:45:17 +0200 | [diff] [blame] | 567 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
| 568 | "Attribute failed policy validation"); |
Johannes Berg | c29f184 | 2018-09-26 11:15:32 +0200 | [diff] [blame] | 569 | return err; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 570 | } |
| 571 | |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 572 | static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype, |
| 573 | const struct nla_policy *policy, |
| 574 | unsigned int validate, |
| 575 | struct netlink_ext_ack *extack, |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 576 | struct nlattr **tb, unsigned int depth) |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 577 | { |
Jan Engelhardt | 3654654 | 2010-11-16 09:52:32 -0800 | [diff] [blame] | 578 | const struct nlattr *nla; |
Johannes Berg | fceb643 | 2017-04-12 14:34:07 +0200 | [diff] [blame] | 579 | int rem; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 580 | |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 581 | if (depth >= MAX_POLICY_RECURSION_DEPTH) { |
| 582 | NL_SET_ERR_MSG(extack, |
| 583 | "allowed policy recursion depth exceeded"); |
| 584 | return -EINVAL; |
| 585 | } |
| 586 | |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 587 | if (tb) |
| 588 | memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); |
Johannes Berg | fceb643 | 2017-04-12 14:34:07 +0200 | [diff] [blame] | 589 | |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 590 | nla_for_each_attr(nla, head, len, rem) { |
| 591 | u16 type = nla_type(nla); |
| 592 | |
| 593 | if (type == 0 || type > maxtype) { |
| 594 | if (validate & NL_VALIDATE_MAXTYPE) { |
Michal Kubecek | d54a16b | 2019-05-02 16:15:10 +0200 | [diff] [blame] | 595 | NL_SET_ERR_MSG_ATTR(extack, nla, |
| 596 | "Unknown attribute type"); |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 597 | return -EINVAL; |
| 598 | } |
| 599 | continue; |
| 600 | } |
Eric Dumazet | f0950402 | 2023-01-19 11:01:50 +0000 | [diff] [blame] | 601 | type = array_index_nospec(type, maxtype + 1); |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 602 | if (policy) { |
| 603 | int err = validate_nla(nla, maxtype, policy, |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 604 | validate, extack, depth); |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 605 | |
| 606 | if (err < 0) |
| 607 | return err; |
| 608 | } |
| 609 | |
| 610 | if (tb) |
| 611 | tb[type] = (struct nlattr *)nla; |
| 612 | } |
| 613 | |
| 614 | if (unlikely(rem > 0)) { |
| 615 | pr_warn_ratelimited("netlink: %d bytes leftover after parsing attributes in process `%s'.\n", |
| 616 | rem, current->comm); |
| 617 | NL_SET_ERR_MSG(extack, "bytes leftover after parsing attributes"); |
| 618 | if (validate & NL_VALIDATE_TRAILING) |
| 619 | return -EINVAL; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 620 | } |
| 621 | |
Johannes Berg | fceb643 | 2017-04-12 14:34:07 +0200 | [diff] [blame] | 622 | return 0; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 623 | } |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 624 | |
| 625 | /** |
| 626 | * __nla_validate - Validate a stream of attributes |
| 627 | * @head: head of attribute stream |
| 628 | * @len: length of attribute stream |
| 629 | * @maxtype: maximum attribute type to be expected |
| 630 | * @policy: validation policy |
| 631 | * @validate: validation strictness |
| 632 | * @extack: extended ACK report struct |
| 633 | * |
| 634 | * Validates all attributes in the specified attribute stream against the |
| 635 | * specified policy. Validation depends on the validate flags passed, see |
| 636 | * &enum netlink_validation for more details on that. |
Zhen Lei | 9dbbc3b | 2021-07-07 18:07:31 -0700 | [diff] [blame] | 637 | * See documentation of struct nla_policy for more details. |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 638 | * |
| 639 | * Returns 0 on success or a negative error code. |
| 640 | */ |
| 641 | int __nla_validate(const struct nlattr *head, int len, int maxtype, |
| 642 | const struct nla_policy *policy, unsigned int validate, |
| 643 | struct netlink_ext_ack *extack) |
| 644 | { |
| 645 | return __nla_validate_parse(head, len, maxtype, policy, validate, |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 646 | extack, NULL, 0); |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 647 | } |
| 648 | EXPORT_SYMBOL(__nla_validate); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 649 | |
| 650 | /** |
Zhen Lei | 9dbbc3b | 2021-07-07 18:07:31 -0700 | [diff] [blame] | 651 | * nla_policy_len - Determine the max. length of a policy |
Yang Li | 8e18be7 | 2022-11-07 14:26:23 +0800 | [diff] [blame] | 652 | * @p: policy to use |
Holger Eitzenberger | e487eb99 | 2009-03-25 18:26:30 +0100 | [diff] [blame] | 653 | * @n: number of policies |
| 654 | * |
| 655 | * Determines the max. length of the policy. It is currently used |
| 656 | * to allocated Netlink buffers roughly the size of the actual |
| 657 | * message. |
| 658 | * |
| 659 | * Returns 0 on success or a negative error code. |
| 660 | */ |
| 661 | int |
| 662 | nla_policy_len(const struct nla_policy *p, int n) |
| 663 | { |
| 664 | int i, len = 0; |
| 665 | |
Lars Ellenberg | e3fa3af | 2011-02-28 12:38:25 -0800 | [diff] [blame] | 666 | for (i = 0; i < n; i++, p++) { |
Holger Eitzenberger | e487eb99 | 2009-03-25 18:26:30 +0100 | [diff] [blame] | 667 | if (p->len) |
| 668 | len += nla_total_size(p->len); |
David Ahern | 28033ae | 2017-11-07 21:59:40 -0800 | [diff] [blame] | 669 | else if (nla_attr_len[p->type]) |
| 670 | len += nla_total_size(nla_attr_len[p->type]); |
Holger Eitzenberger | e487eb99 | 2009-03-25 18:26:30 +0100 | [diff] [blame] | 671 | else if (nla_attr_minlen[p->type]) |
| 672 | len += nla_total_size(nla_attr_minlen[p->type]); |
| 673 | } |
| 674 | |
| 675 | return len; |
| 676 | } |
Fabian Frederick | 6d6a138 | 2014-06-04 16:11:57 -0700 | [diff] [blame] | 677 | EXPORT_SYMBOL(nla_policy_len); |
Holger Eitzenberger | e487eb99 | 2009-03-25 18:26:30 +0100 | [diff] [blame] | 678 | |
| 679 | /** |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 680 | * __nla_parse - Parse a stream of attributes into a tb buffer |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 681 | * @tb: destination array with maxtype+1 elements |
| 682 | * @maxtype: maximum attribute type to be expected |
| 683 | * @head: head of attribute stream |
| 684 | * @len: length of attribute stream |
Julius Volz | 10b595a | 2008-06-27 20:02:14 -0700 | [diff] [blame] | 685 | * @policy: validation policy |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 686 | * @validate: validation strictness |
| 687 | * @extack: extended ACK pointer |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 688 | * |
| 689 | * Parses a stream of attributes and stores a pointer to each attribute in |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 690 | * the tb array accessible via the attribute type. |
| 691 | * Validation is controlled by the @validate parameter. |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 692 | * |
| 693 | * Returns 0 on success or a negative error code. |
| 694 | */ |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 695 | int __nla_parse(struct nlattr **tb, int maxtype, |
| 696 | const struct nlattr *head, int len, |
| 697 | const struct nla_policy *policy, unsigned int validate, |
| 698 | struct netlink_ext_ack *extack) |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 699 | { |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 700 | return __nla_validate_parse(head, len, maxtype, policy, validate, |
Johannes Berg | 7690aa1 | 2020-04-30 22:13:06 +0200 | [diff] [blame] | 701 | extack, tb, 0); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 702 | } |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 703 | EXPORT_SYMBOL(__nla_parse); |
David Ahern | a5f6cba | 2018-10-07 20:16:25 -0700 | [diff] [blame] | 704 | |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 705 | /** |
| 706 | * nla_find - Find a specific attribute in a stream of attributes |
| 707 | * @head: head of attribute stream |
| 708 | * @len: length of attribute stream |
| 709 | * @attrtype: type of attribute to look for |
| 710 | * |
| 711 | * Returns the first attribute in the stream matching the specified type. |
| 712 | */ |
Jan Engelhardt | 3654654 | 2010-11-16 09:52:32 -0800 | [diff] [blame] | 713 | struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype) |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 714 | { |
Jan Engelhardt | 3654654 | 2010-11-16 09:52:32 -0800 | [diff] [blame] | 715 | const struct nlattr *nla; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 716 | int rem; |
| 717 | |
| 718 | nla_for_each_attr(nla, head, len, rem) |
Thomas Graf | 8f4c1f9 | 2007-09-12 14:44:36 +0200 | [diff] [blame] | 719 | if (nla_type(nla) == attrtype) |
Jan Engelhardt | 3654654 | 2010-11-16 09:52:32 -0800 | [diff] [blame] | 720 | return (struct nlattr *)nla; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 721 | |
| 722 | return NULL; |
| 723 | } |
Fabian Frederick | 6d6a138 | 2014-06-04 16:11:57 -0700 | [diff] [blame] | 724 | EXPORT_SYMBOL(nla_find); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 725 | |
| 726 | /** |
Francis Laniel | 872f690 | 2020-11-15 18:08:06 +0100 | [diff] [blame] | 727 | * nla_strscpy - Copy string attribute payload into a sized buffer |
Francis Laniel | 9ca7187 | 2020-11-15 18:08:05 +0100 | [diff] [blame] | 728 | * @dst: Where to copy the string to. |
| 729 | * @nla: Attribute to copy the string from. |
| 730 | * @dstsize: Size of destination buffer. |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 731 | * |
| 732 | * Copies at most dstsize - 1 bytes into the destination buffer. |
Francis Laniel | 9ca7187 | 2020-11-15 18:08:05 +0100 | [diff] [blame] | 733 | * Unlike strlcpy the destination buffer is always padded out. |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 734 | * |
Francis Laniel | 9ca7187 | 2020-11-15 18:08:05 +0100 | [diff] [blame] | 735 | * Return: |
| 736 | * * srclen - Returns @nla length (not including the trailing %NUL). |
| 737 | * * -E2BIG - If @dstsize is 0 or greater than U16_MAX or @nla length greater |
| 738 | * than @dstsize. |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 739 | */ |
Francis Laniel | 872f690 | 2020-11-15 18:08:06 +0100 | [diff] [blame] | 740 | ssize_t nla_strscpy(char *dst, const struct nlattr *nla, size_t dstsize) |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 741 | { |
| 742 | size_t srclen = nla_len(nla); |
| 743 | char *src = nla_data(nla); |
Francis Laniel | 9ca7187 | 2020-11-15 18:08:05 +0100 | [diff] [blame] | 744 | ssize_t ret; |
| 745 | size_t len; |
| 746 | |
| 747 | if (dstsize == 0 || WARN_ON_ONCE(dstsize > U16_MAX)) |
| 748 | return -E2BIG; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 749 | |
| 750 | if (srclen > 0 && src[srclen - 1] == '\0') |
| 751 | srclen--; |
| 752 | |
Francis Laniel | 9ca7187 | 2020-11-15 18:08:05 +0100 | [diff] [blame] | 753 | if (srclen >= dstsize) { |
| 754 | len = dstsize - 1; |
| 755 | ret = -E2BIG; |
| 756 | } else { |
| 757 | len = srclen; |
| 758 | ret = len; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 759 | } |
| 760 | |
Francis Laniel | 9ca7187 | 2020-11-15 18:08:05 +0100 | [diff] [blame] | 761 | memcpy(dst, src, len); |
| 762 | /* Zero pad end of dst. */ |
| 763 | memset(dst + len, 0, dstsize - len); |
| 764 | |
| 765 | return ret; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 766 | } |
Francis Laniel | 872f690 | 2020-11-15 18:08:06 +0100 | [diff] [blame] | 767 | EXPORT_SYMBOL(nla_strscpy); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 768 | |
| 769 | /** |
Phil Sutter | 2cf0c8b | 2017-07-27 16:56:40 +0200 | [diff] [blame] | 770 | * nla_strdup - Copy string attribute payload into a newly allocated buffer |
| 771 | * @nla: attribute to copy the string from |
| 772 | * @flags: the type of memory to allocate (see kmalloc). |
| 773 | * |
| 774 | * Returns a pointer to the allocated buffer or NULL on error. |
| 775 | */ |
| 776 | char *nla_strdup(const struct nlattr *nla, gfp_t flags) |
| 777 | { |
| 778 | size_t srclen = nla_len(nla); |
| 779 | char *src = nla_data(nla), *dst; |
| 780 | |
| 781 | if (srclen > 0 && src[srclen - 1] == '\0') |
| 782 | srclen--; |
| 783 | |
| 784 | dst = kmalloc(srclen + 1, flags); |
| 785 | if (dst != NULL) { |
| 786 | memcpy(dst, src, srclen); |
| 787 | dst[srclen] = '\0'; |
| 788 | } |
| 789 | return dst; |
| 790 | } |
| 791 | EXPORT_SYMBOL(nla_strdup); |
| 792 | |
| 793 | /** |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 794 | * nla_memcpy - Copy a netlink attribute into another memory area |
| 795 | * @dest: where to copy to memcpy |
| 796 | * @src: netlink attribute to copy from |
| 797 | * @count: size of the destination area |
| 798 | * |
| 799 | * Note: The number of bytes copied is limited by the length of |
| 800 | * attribute's payload. memcpy |
| 801 | * |
| 802 | * Returns the number of bytes copied. |
| 803 | */ |
Patrick McHardy | b057efd | 2008-10-28 11:59:11 -0700 | [diff] [blame] | 804 | int nla_memcpy(void *dest, const struct nlattr *src, int count) |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 805 | { |
| 806 | int minlen = min_t(int, count, nla_len(src)); |
| 807 | |
| 808 | memcpy(dest, nla_data(src), minlen); |
Jiri Benc | 5899f04 | 2015-03-29 16:05:28 +0200 | [diff] [blame] | 809 | if (count > minlen) |
| 810 | memset(dest + minlen, 0, count - minlen); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 811 | |
| 812 | return minlen; |
| 813 | } |
Fabian Frederick | 6d6a138 | 2014-06-04 16:11:57 -0700 | [diff] [blame] | 814 | EXPORT_SYMBOL(nla_memcpy); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 815 | |
| 816 | /** |
| 817 | * nla_memcmp - Compare an attribute with sized memory area |
| 818 | * @nla: netlink attribute |
| 819 | * @data: memory area |
| 820 | * @size: size of memory area |
| 821 | */ |
| 822 | int nla_memcmp(const struct nlattr *nla, const void *data, |
| 823 | size_t size) |
| 824 | { |
| 825 | int d = nla_len(nla) - size; |
| 826 | |
| 827 | if (d == 0) |
| 828 | d = memcmp(nla_data(nla), data, size); |
| 829 | |
| 830 | return d; |
| 831 | } |
Fabian Frederick | 6d6a138 | 2014-06-04 16:11:57 -0700 | [diff] [blame] | 832 | EXPORT_SYMBOL(nla_memcmp); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 833 | |
| 834 | /** |
| 835 | * nla_strcmp - Compare a string attribute against a string |
| 836 | * @nla: netlink string attribute |
| 837 | * @str: another string |
| 838 | */ |
| 839 | int nla_strcmp(const struct nlattr *nla, const char *str) |
| 840 | { |
Pablo Neira | 8b7b932 | 2014-04-01 19:38:44 +0200 | [diff] [blame] | 841 | int len = strlen(str); |
| 842 | char *buf = nla_data(nla); |
| 843 | int attrlen = nla_len(nla); |
| 844 | int d; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 845 | |
Maciej Żenczykowski | 2c16db6 | 2021-05-05 09:58:31 -0700 | [diff] [blame] | 846 | while (attrlen > 0 && buf[attrlen - 1] == '\0') |
Pablo Neira | 8b7b932 | 2014-04-01 19:38:44 +0200 | [diff] [blame] | 847 | attrlen--; |
| 848 | |
| 849 | d = attrlen - len; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 850 | if (d == 0) |
| 851 | d = memcmp(nla_data(nla), str, len); |
| 852 | |
| 853 | return d; |
| 854 | } |
Fabian Frederick | 6d6a138 | 2014-06-04 16:11:57 -0700 | [diff] [blame] | 855 | EXPORT_SYMBOL(nla_strcmp); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 856 | |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 857 | #ifdef CONFIG_NET |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 858 | /** |
| 859 | * __nla_reserve - reserve room for attribute on the skb |
| 860 | * @skb: socket buffer to reserve room on |
| 861 | * @attrtype: attribute type |
| 862 | * @attrlen: length of attribute payload |
| 863 | * |
| 864 | * Adds a netlink attribute header to a socket buffer and reserves |
| 865 | * room for the payload but does not copy it. |
| 866 | * |
| 867 | * The caller is responsible to ensure that the skb provides enough |
| 868 | * tailroom for the attribute header and payload. |
| 869 | */ |
| 870 | struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) |
| 871 | { |
| 872 | struct nlattr *nla; |
| 873 | |
Johannes Berg | 4df864c | 2017-06-16 14:29:21 +0200 | [diff] [blame] | 874 | nla = skb_put(skb, nla_total_size(attrlen)); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 875 | nla->nla_type = attrtype; |
| 876 | nla->nla_len = nla_attr_size(attrlen); |
| 877 | |
| 878 | memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen)); |
| 879 | |
| 880 | return nla; |
| 881 | } |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 882 | EXPORT_SYMBOL(__nla_reserve); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 883 | |
| 884 | /** |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 885 | * __nla_reserve_64bit - reserve room for attribute on the skb and align it |
| 886 | * @skb: socket buffer to reserve room on |
| 887 | * @attrtype: attribute type |
| 888 | * @attrlen: length of attribute payload |
Nicolas Dichtel | 11a9957 | 2016-04-22 17:31:16 +0200 | [diff] [blame] | 889 | * @padattr: attribute type for the padding |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 890 | * |
| 891 | * Adds a netlink attribute header to a socket buffer and reserves |
| 892 | * room for the payload but does not copy it. It also ensure that this |
Nicolas Dichtel | 11a9957 | 2016-04-22 17:31:16 +0200 | [diff] [blame] | 893 | * attribute will have a 64-bit aligned nla_data() area. |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 894 | * |
| 895 | * The caller is responsible to ensure that the skb provides enough |
| 896 | * tailroom for the attribute header and payload. |
| 897 | */ |
| 898 | struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, |
| 899 | int attrlen, int padattr) |
| 900 | { |
Miaohe Lin | 4718a47 | 2020-08-24 23:25:17 -0400 | [diff] [blame] | 901 | nla_align_64bit(skb, padattr); |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 902 | |
| 903 | return __nla_reserve(skb, attrtype, attrlen); |
| 904 | } |
| 905 | EXPORT_SYMBOL(__nla_reserve_64bit); |
| 906 | |
| 907 | /** |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 908 | * __nla_reserve_nohdr - reserve room for attribute without header |
| 909 | * @skb: socket buffer to reserve room on |
| 910 | * @attrlen: length of attribute payload |
| 911 | * |
| 912 | * Reserves room for attribute payload without a header. |
| 913 | * |
| 914 | * The caller is responsible to ensure that the skb provides enough |
| 915 | * tailroom for the payload. |
| 916 | */ |
| 917 | void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen) |
| 918 | { |
yuan linyu | b952f4d | 2017-06-18 22:52:04 +0800 | [diff] [blame] | 919 | return skb_put_zero(skb, NLA_ALIGN(attrlen)); |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 920 | } |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 921 | EXPORT_SYMBOL(__nla_reserve_nohdr); |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 922 | |
| 923 | /** |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 924 | * nla_reserve - reserve room for attribute on the skb |
| 925 | * @skb: socket buffer to reserve room on |
| 926 | * @attrtype: attribute type |
| 927 | * @attrlen: length of attribute payload |
| 928 | * |
| 929 | * Adds a netlink attribute header to a socket buffer and reserves |
| 930 | * room for the payload but does not copy it. |
| 931 | * |
| 932 | * Returns NULL if the tailroom of the skb is insufficient to store |
| 933 | * the attribute header and payload. |
| 934 | */ |
| 935 | struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) |
| 936 | { |
| 937 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) |
| 938 | return NULL; |
| 939 | |
| 940 | return __nla_reserve(skb, attrtype, attrlen); |
| 941 | } |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 942 | EXPORT_SYMBOL(nla_reserve); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 943 | |
| 944 | /** |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 945 | * nla_reserve_64bit - reserve room for attribute on the skb and align it |
| 946 | * @skb: socket buffer to reserve room on |
| 947 | * @attrtype: attribute type |
| 948 | * @attrlen: length of attribute payload |
Nicolas Dichtel | 11a9957 | 2016-04-22 17:31:16 +0200 | [diff] [blame] | 949 | * @padattr: attribute type for the padding |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 950 | * |
| 951 | * Adds a netlink attribute header to a socket buffer and reserves |
| 952 | * room for the payload but does not copy it. It also ensure that this |
Nicolas Dichtel | 11a9957 | 2016-04-22 17:31:16 +0200 | [diff] [blame] | 953 | * attribute will have a 64-bit aligned nla_data() area. |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 954 | * |
| 955 | * Returns NULL if the tailroom of the skb is insufficient to store |
| 956 | * the attribute header and payload. |
| 957 | */ |
| 958 | struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, int attrlen, |
| 959 | int padattr) |
| 960 | { |
| 961 | size_t len; |
| 962 | |
| 963 | if (nla_need_padding_for_64bit(skb)) |
| 964 | len = nla_total_size_64bit(attrlen); |
| 965 | else |
| 966 | len = nla_total_size(attrlen); |
| 967 | if (unlikely(skb_tailroom(skb) < len)) |
| 968 | return NULL; |
| 969 | |
| 970 | return __nla_reserve_64bit(skb, attrtype, attrlen, padattr); |
| 971 | } |
| 972 | EXPORT_SYMBOL(nla_reserve_64bit); |
| 973 | |
| 974 | /** |
Julius Volz | 10b595a | 2008-06-27 20:02:14 -0700 | [diff] [blame] | 975 | * nla_reserve_nohdr - reserve room for attribute without header |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 976 | * @skb: socket buffer to reserve room on |
Julius Volz | 10b595a | 2008-06-27 20:02:14 -0700 | [diff] [blame] | 977 | * @attrlen: length of attribute payload |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 978 | * |
| 979 | * Reserves room for attribute payload without a header. |
| 980 | * |
| 981 | * Returns NULL if the tailroom of the skb is insufficient to store |
| 982 | * the attribute payload. |
| 983 | */ |
| 984 | void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen) |
| 985 | { |
| 986 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) |
| 987 | return NULL; |
| 988 | |
| 989 | return __nla_reserve_nohdr(skb, attrlen); |
| 990 | } |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 991 | EXPORT_SYMBOL(nla_reserve_nohdr); |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 992 | |
| 993 | /** |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 994 | * __nla_put - Add a netlink attribute to a socket buffer |
| 995 | * @skb: socket buffer to add attribute to |
| 996 | * @attrtype: attribute type |
| 997 | * @attrlen: length of attribute payload |
| 998 | * @data: head of attribute payload |
| 999 | * |
| 1000 | * The caller is responsible to ensure that the skb provides enough |
| 1001 | * tailroom for the attribute header and payload. |
| 1002 | */ |
| 1003 | void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, |
| 1004 | const void *data) |
| 1005 | { |
| 1006 | struct nlattr *nla; |
| 1007 | |
| 1008 | nla = __nla_reserve(skb, attrtype, attrlen); |
| 1009 | memcpy(nla_data(nla), data, attrlen); |
| 1010 | } |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 1011 | EXPORT_SYMBOL(__nla_put); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 1012 | |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 1013 | /** |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 1014 | * __nla_put_64bit - Add a netlink attribute to a socket buffer and align it |
| 1015 | * @skb: socket buffer to add attribute to |
| 1016 | * @attrtype: attribute type |
| 1017 | * @attrlen: length of attribute payload |
| 1018 | * @data: head of attribute payload |
Nicolas Dichtel | 11a9957 | 2016-04-22 17:31:16 +0200 | [diff] [blame] | 1019 | * @padattr: attribute type for the padding |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 1020 | * |
| 1021 | * The caller is responsible to ensure that the skb provides enough |
| 1022 | * tailroom for the attribute header and payload. |
| 1023 | */ |
| 1024 | void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, |
| 1025 | const void *data, int padattr) |
| 1026 | { |
| 1027 | struct nlattr *nla; |
| 1028 | |
| 1029 | nla = __nla_reserve_64bit(skb, attrtype, attrlen, padattr); |
| 1030 | memcpy(nla_data(nla), data, attrlen); |
| 1031 | } |
| 1032 | EXPORT_SYMBOL(__nla_put_64bit); |
| 1033 | |
| 1034 | /** |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 1035 | * __nla_put_nohdr - Add a netlink attribute without header |
| 1036 | * @skb: socket buffer to add attribute to |
| 1037 | * @attrlen: length of attribute payload |
| 1038 | * @data: head of attribute payload |
| 1039 | * |
| 1040 | * The caller is responsible to ensure that the skb provides enough |
| 1041 | * tailroom for the attribute payload. |
| 1042 | */ |
| 1043 | void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) |
| 1044 | { |
| 1045 | void *start; |
| 1046 | |
| 1047 | start = __nla_reserve_nohdr(skb, attrlen); |
| 1048 | memcpy(start, data, attrlen); |
| 1049 | } |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 1050 | EXPORT_SYMBOL(__nla_put_nohdr); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 1051 | |
| 1052 | /** |
| 1053 | * nla_put - Add a netlink attribute to a socket buffer |
| 1054 | * @skb: socket buffer to add attribute to |
| 1055 | * @attrtype: attribute type |
| 1056 | * @attrlen: length of attribute payload |
| 1057 | * @data: head of attribute payload |
| 1058 | * |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 1059 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 1060 | * the attribute header and payload. |
| 1061 | */ |
| 1062 | int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data) |
| 1063 | { |
| 1064 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 1065 | return -EMSGSIZE; |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 1066 | |
| 1067 | __nla_put(skb, attrtype, attrlen, data); |
| 1068 | return 0; |
| 1069 | } |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 1070 | EXPORT_SYMBOL(nla_put); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 1071 | |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 1072 | /** |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 1073 | * nla_put_64bit - Add a netlink attribute to a socket buffer and align it |
| 1074 | * @skb: socket buffer to add attribute to |
| 1075 | * @attrtype: attribute type |
| 1076 | * @attrlen: length of attribute payload |
| 1077 | * @data: head of attribute payload |
Nicolas Dichtel | 11a9957 | 2016-04-22 17:31:16 +0200 | [diff] [blame] | 1078 | * @padattr: attribute type for the padding |
Nicolas Dichtel | 089bf1a | 2016-04-21 18:58:24 +0200 | [diff] [blame] | 1079 | * |
| 1080 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
| 1081 | * the attribute header and payload. |
| 1082 | */ |
| 1083 | int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, |
| 1084 | const void *data, int padattr) |
| 1085 | { |
| 1086 | size_t len; |
| 1087 | |
| 1088 | if (nla_need_padding_for_64bit(skb)) |
| 1089 | len = nla_total_size_64bit(attrlen); |
| 1090 | else |
| 1091 | len = nla_total_size(attrlen); |
| 1092 | if (unlikely(skb_tailroom(skb) < len)) |
| 1093 | return -EMSGSIZE; |
| 1094 | |
| 1095 | __nla_put_64bit(skb, attrtype, attrlen, data, padattr); |
| 1096 | return 0; |
| 1097 | } |
| 1098 | EXPORT_SYMBOL(nla_put_64bit); |
| 1099 | |
| 1100 | /** |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 1101 | * nla_put_nohdr - Add a netlink attribute without header |
| 1102 | * @skb: socket buffer to add attribute to |
| 1103 | * @attrlen: length of attribute payload |
| 1104 | * @data: head of attribute payload |
| 1105 | * |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 1106 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 1107 | * the attribute payload. |
| 1108 | */ |
| 1109 | int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) |
| 1110 | { |
| 1111 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 1112 | return -EMSGSIZE; |
Thomas Graf | fe4944e | 2006-08-04 23:03:05 -0700 | [diff] [blame] | 1113 | |
| 1114 | __nla_put_nohdr(skb, attrlen, data); |
| 1115 | return 0; |
| 1116 | } |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 1117 | EXPORT_SYMBOL(nla_put_nohdr); |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 1118 | |
Patrick McHardy | 01480e1 | 2008-01-22 22:10:59 -0800 | [diff] [blame] | 1119 | /** |
| 1120 | * nla_append - Add a netlink attribute without header or padding |
| 1121 | * @skb: socket buffer to add attribute to |
| 1122 | * @attrlen: length of attribute payload |
| 1123 | * @data: head of attribute payload |
| 1124 | * |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 1125 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
Patrick McHardy | 01480e1 | 2008-01-22 22:10:59 -0800 | [diff] [blame] | 1126 | * the attribute payload. |
| 1127 | */ |
| 1128 | int nla_append(struct sk_buff *skb, int attrlen, const void *data) |
| 1129 | { |
| 1130 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 1131 | return -EMSGSIZE; |
Patrick McHardy | 01480e1 | 2008-01-22 22:10:59 -0800 | [diff] [blame] | 1132 | |
Johannes Berg | 59ae1d1 | 2017-06-16 14:29:20 +0200 | [diff] [blame] | 1133 | skb_put_data(skb, data, attrlen); |
Patrick McHardy | 01480e1 | 2008-01-22 22:10:59 -0800 | [diff] [blame] | 1134 | return 0; |
| 1135 | } |
Herbert Xu | 9080021 | 2009-03-11 23:18:32 +0800 | [diff] [blame] | 1136 | EXPORT_SYMBOL(nla_append); |
| 1137 | #endif |