Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 9 | */ |
| 10 | |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/netlink.h> |
| 15 | #include <linux/netfilter.h> |
| 16 | #include <linux/netfilter/nf_tables.h> |
| 17 | #include <net/dst.h> |
| 18 | #include <net/sock.h> |
| 19 | #include <net/tcp_states.h> /* for TCP_TIME_WAIT */ |
| 20 | #include <net/netfilter/nf_tables.h> |
| 21 | |
| 22 | struct nft_meta { |
| 23 | enum nft_meta_keys key:8; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 24 | union { |
| 25 | enum nft_registers dreg:8; |
| 26 | enum nft_registers sreg:8; |
| 27 | }; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 28 | }; |
| 29 | |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 30 | static void nft_meta_get_eval(const struct nft_expr *expr, |
| 31 | struct nft_data data[NFT_REG_MAX + 1], |
| 32 | const struct nft_pktinfo *pkt) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 33 | { |
| 34 | const struct nft_meta *priv = nft_expr_priv(expr); |
| 35 | const struct sk_buff *skb = pkt->skb; |
| 36 | const struct net_device *in = pkt->in, *out = pkt->out; |
| 37 | struct nft_data *dest = &data[priv->dreg]; |
| 38 | |
| 39 | switch (priv->key) { |
| 40 | case NFT_META_LEN: |
| 41 | dest->data[0] = skb->len; |
| 42 | break; |
| 43 | case NFT_META_PROTOCOL: |
| 44 | *(__be16 *)dest->data = skb->protocol; |
| 45 | break; |
Patrick McHardy | 124edfa | 2014-01-03 12:16:17 +0000 | [diff] [blame] | 46 | case NFT_META_NFPROTO: |
| 47 | dest->data[0] = pkt->ops->pf; |
| 48 | break; |
Patrick McHardy | 4566bf2 | 2014-01-03 12:16:18 +0000 | [diff] [blame] | 49 | case NFT_META_L4PROTO: |
| 50 | dest->data[0] = pkt->tprot; |
| 51 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 52 | case NFT_META_PRIORITY: |
| 53 | dest->data[0] = skb->priority; |
| 54 | break; |
| 55 | case NFT_META_MARK: |
| 56 | dest->data[0] = skb->mark; |
| 57 | break; |
| 58 | case NFT_META_IIF: |
| 59 | if (in == NULL) |
| 60 | goto err; |
| 61 | dest->data[0] = in->ifindex; |
| 62 | break; |
| 63 | case NFT_META_OIF: |
| 64 | if (out == NULL) |
| 65 | goto err; |
| 66 | dest->data[0] = out->ifindex; |
| 67 | break; |
| 68 | case NFT_META_IIFNAME: |
| 69 | if (in == NULL) |
| 70 | goto err; |
| 71 | strncpy((char *)dest->data, in->name, sizeof(dest->data)); |
| 72 | break; |
| 73 | case NFT_META_OIFNAME: |
| 74 | if (out == NULL) |
| 75 | goto err; |
| 76 | strncpy((char *)dest->data, out->name, sizeof(dest->data)); |
| 77 | break; |
| 78 | case NFT_META_IIFTYPE: |
| 79 | if (in == NULL) |
| 80 | goto err; |
| 81 | *(u16 *)dest->data = in->type; |
| 82 | break; |
| 83 | case NFT_META_OIFTYPE: |
| 84 | if (out == NULL) |
| 85 | goto err; |
| 86 | *(u16 *)dest->data = out->type; |
| 87 | break; |
| 88 | case NFT_META_SKUID: |
| 89 | if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT) |
| 90 | goto err; |
| 91 | |
| 92 | read_lock_bh(&skb->sk->sk_callback_lock); |
| 93 | if (skb->sk->sk_socket == NULL || |
| 94 | skb->sk->sk_socket->file == NULL) { |
| 95 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 96 | goto err; |
| 97 | } |
| 98 | |
| 99 | dest->data[0] = |
| 100 | from_kuid_munged(&init_user_ns, |
| 101 | skb->sk->sk_socket->file->f_cred->fsuid); |
| 102 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 103 | break; |
| 104 | case NFT_META_SKGID: |
| 105 | if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT) |
| 106 | goto err; |
| 107 | |
| 108 | read_lock_bh(&skb->sk->sk_callback_lock); |
| 109 | if (skb->sk->sk_socket == NULL || |
| 110 | skb->sk->sk_socket->file == NULL) { |
| 111 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 112 | goto err; |
| 113 | } |
| 114 | dest->data[0] = |
| 115 | from_kgid_munged(&init_user_ns, |
| 116 | skb->sk->sk_socket->file->f_cred->fsgid); |
| 117 | read_unlock_bh(&skb->sk->sk_callback_lock); |
| 118 | break; |
Paul Bolle | 06efbd6 | 2014-02-12 10:53:01 +0100 | [diff] [blame] | 119 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 120 | case NFT_META_RTCLASSID: { |
| 121 | const struct dst_entry *dst = skb_dst(skb); |
| 122 | |
| 123 | if (dst == NULL) |
| 124 | goto err; |
| 125 | dest->data[0] = dst->tclassid; |
| 126 | break; |
| 127 | } |
| 128 | #endif |
| 129 | #ifdef CONFIG_NETWORK_SECMARK |
| 130 | case NFT_META_SECMARK: |
| 131 | dest->data[0] = skb->secmark; |
| 132 | break; |
| 133 | #endif |
| 134 | default: |
| 135 | WARN_ON(1); |
| 136 | goto err; |
| 137 | } |
| 138 | return; |
| 139 | |
| 140 | err: |
| 141 | data[NFT_REG_VERDICT].verdict = NFT_BREAK; |
| 142 | } |
| 143 | |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 144 | static void nft_meta_set_eval(const struct nft_expr *expr, |
| 145 | struct nft_data data[NFT_REG_MAX + 1], |
| 146 | const struct nft_pktinfo *pkt) |
| 147 | { |
| 148 | const struct nft_meta *meta = nft_expr_priv(expr); |
| 149 | struct sk_buff *skb = pkt->skb; |
| 150 | u32 value = data[meta->sreg].data[0]; |
| 151 | |
| 152 | switch (meta->key) { |
| 153 | case NFT_META_MARK: |
| 154 | skb->mark = value; |
| 155 | break; |
| 156 | case NFT_META_PRIORITY: |
| 157 | skb->priority = value; |
| 158 | break; |
| 159 | case NFT_META_NFTRACE: |
| 160 | skb->nf_trace = 1; |
| 161 | break; |
| 162 | default: |
| 163 | WARN_ON(1); |
| 164 | } |
| 165 | } |
| 166 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 167 | static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { |
| 168 | [NFTA_META_DREG] = { .type = NLA_U32 }, |
| 169 | [NFTA_META_KEY] = { .type = NLA_U32 }, |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 170 | [NFTA_META_SREG] = { .type = NLA_U32 }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 171 | }; |
| 172 | |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 173 | static int nft_meta_init_validate_set(uint32_t key) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 174 | { |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 175 | switch (key) { |
| 176 | case NFT_META_MARK: |
| 177 | case NFT_META_PRIORITY: |
| 178 | case NFT_META_NFTRACE: |
| 179 | return 0; |
| 180 | default: |
| 181 | return -EOPNOTSUPP; |
| 182 | } |
| 183 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 184 | |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 185 | static int nft_meta_init_validate_get(uint32_t key) |
| 186 | { |
| 187 | switch (key) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 188 | case NFT_META_LEN: |
| 189 | case NFT_META_PROTOCOL: |
Patrick McHardy | 124edfa | 2014-01-03 12:16:17 +0000 | [diff] [blame] | 190 | case NFT_META_NFPROTO: |
Patrick McHardy | 4566bf2 | 2014-01-03 12:16:18 +0000 | [diff] [blame] | 191 | case NFT_META_L4PROTO: |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 192 | case NFT_META_PRIORITY: |
| 193 | case NFT_META_MARK: |
| 194 | case NFT_META_IIF: |
| 195 | case NFT_META_OIF: |
| 196 | case NFT_META_IIFNAME: |
| 197 | case NFT_META_OIFNAME: |
| 198 | case NFT_META_IIFTYPE: |
| 199 | case NFT_META_OIFTYPE: |
| 200 | case NFT_META_SKUID: |
| 201 | case NFT_META_SKGID: |
Paul Bolle | 06efbd6 | 2014-02-12 10:53:01 +0100 | [diff] [blame] | 202 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 203 | case NFT_META_RTCLASSID: |
| 204 | #endif |
| 205 | #ifdef CONFIG_NETWORK_SECMARK |
| 206 | case NFT_META_SECMARK: |
| 207 | #endif |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 208 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 209 | default: |
| 210 | return -EOPNOTSUPP; |
| 211 | } |
| 212 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 213 | } |
| 214 | |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 215 | static int nft_meta_init(const struct nft_ctx *ctx, const struct nft_expr *expr, |
| 216 | const struct nlattr * const tb[]) |
| 217 | { |
| 218 | struct nft_meta *priv = nft_expr_priv(expr); |
| 219 | int err; |
| 220 | |
| 221 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); |
| 222 | |
| 223 | if (tb[NFTA_META_DREG]) { |
| 224 | err = nft_meta_init_validate_get(priv->key); |
| 225 | if (err < 0) |
| 226 | return err; |
| 227 | |
| 228 | priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG])); |
| 229 | err = nft_validate_output_register(priv->dreg); |
| 230 | if (err < 0) |
| 231 | return err; |
| 232 | |
| 233 | return nft_validate_data_load(ctx, priv->dreg, NULL, |
| 234 | NFT_DATA_VALUE); |
| 235 | } |
| 236 | |
| 237 | err = nft_meta_init_validate_set(priv->key); |
| 238 | if (err < 0) |
| 239 | return err; |
| 240 | |
| 241 | priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG])); |
Pablo Neira Ayuso | b38895c | 2014-01-09 20:03:55 +0100 | [diff] [blame] | 242 | err = nft_validate_input_register(priv->sreg); |
| 243 | if (err < 0) |
| 244 | return err; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 245 | |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static int nft_meta_get_dump(struct sk_buff *skb, |
| 250 | const struct nft_expr *expr) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 251 | { |
| 252 | const struct nft_meta *priv = nft_expr_priv(expr); |
| 253 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 254 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
| 255 | goto nla_put_failure; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 256 | if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg))) |
| 257 | goto nla_put_failure; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 258 | return 0; |
| 259 | |
| 260 | nla_put_failure: |
| 261 | return -1; |
| 262 | } |
| 263 | |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 264 | static int nft_meta_set_dump(struct sk_buff *skb, |
| 265 | const struct nft_expr *expr) |
| 266 | { |
| 267 | const struct nft_meta *priv = nft_expr_priv(expr); |
| 268 | |
| 269 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
| 270 | goto nla_put_failure; |
| 271 | if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg))) |
| 272 | goto nla_put_failure; |
| 273 | |
| 274 | return 0; |
| 275 | |
| 276 | nla_put_failure: |
| 277 | return -1; |
| 278 | } |
| 279 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 280 | static struct nft_expr_type nft_meta_type; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 281 | static const struct nft_expr_ops nft_meta_get_ops = { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 282 | .type = &nft_meta_type, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 283 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 284 | .eval = nft_meta_get_eval, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 285 | .init = nft_meta_init, |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 286 | .dump = nft_meta_get_dump, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 287 | }; |
| 288 | |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 289 | static const struct nft_expr_ops nft_meta_set_ops = { |
| 290 | .type = &nft_meta_type, |
| 291 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
| 292 | .eval = nft_meta_set_eval, |
| 293 | .init = nft_meta_init, |
| 294 | .dump = nft_meta_set_dump, |
| 295 | }; |
| 296 | |
| 297 | static const struct nft_expr_ops * |
| 298 | nft_meta_select_ops(const struct nft_ctx *ctx, |
| 299 | const struct nlattr * const tb[]) |
| 300 | { |
| 301 | if (tb[NFTA_META_KEY] == NULL) |
| 302 | return ERR_PTR(-EINVAL); |
| 303 | |
| 304 | if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) |
| 305 | return ERR_PTR(-EINVAL); |
| 306 | |
| 307 | if (tb[NFTA_META_DREG]) |
| 308 | return &nft_meta_get_ops; |
| 309 | |
| 310 | if (tb[NFTA_META_SREG]) |
| 311 | return &nft_meta_set_ops; |
| 312 | |
| 313 | return ERR_PTR(-EINVAL); |
| 314 | } |
| 315 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 316 | static struct nft_expr_type nft_meta_type __read_mostly = { |
| 317 | .name = "meta", |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 318 | .select_ops = &nft_meta_select_ops, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 319 | .policy = nft_meta_policy, |
| 320 | .maxattr = NFTA_META_MAX, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 321 | .owner = THIS_MODULE, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 322 | }; |
| 323 | |
| 324 | static int __init nft_meta_module_init(void) |
| 325 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 326 | return nft_register_expr(&nft_meta_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | static void __exit nft_meta_module_exit(void) |
| 330 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 331 | nft_unregister_expr(&nft_meta_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | module_init(nft_meta_module_init); |
| 335 | module_exit(nft_meta_module_exit); |
| 336 | |
| 337 | MODULE_LICENSE("GPL"); |
| 338 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 339 | MODULE_ALIAS_NFT_EXPR("meta"); |