1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2008, Intel Corporation. 4 * 5 * Author: Alexander Duyck <alexander.h.duyck@intel.com> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/skbuff.h> 12 #include <linux/rtnetlink.h> 13 #include <net/netlink.h> 14 #include <net/pkt_sched.h> 15 #include <net/ip.h> 16 #include <net/ipv6.h> 17 #include <net/dsfield.h> 18 #include <net/pkt_cls.h> 19 20 #include <linux/tc_act/tc_skbedit.h> 21 #include <net/tc_act/tc_skbedit.h> 22 23 static struct tc_action_ops act_skbedit_ops; 24 25 static u16 tcf_skbedit_hash(struct tcf_skbedit_params *params, 26 struct sk_buff *skb) 27 { 28 u16 queue_mapping = params->queue_mapping; 29 30 if (params->flags & SKBEDIT_F_TXQ_SKBHASH) { 31 u32 hash = skb_get_hash(skb); 32 33 queue_mapping += hash % params->mapping_mod; 34 } 35 36 return netdev_cap_txqueue(skb->dev, queue_mapping); 37 } 38 39 static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a, 40 struct tcf_result *res) 41 { 42 struct tcf_skbedit *d = to_skbedit(a); 43 struct tcf_skbedit_params *params; 44 int action; 45 46 tcf_lastuse_update(&d->tcf_tm); 47 bstats_update(this_cpu_ptr(d->common.cpu_bstats), skb); 48 49 params = rcu_dereference_bh(d->params); 50 action = READ_ONCE(d->tcf_action); 51 52 if (params->flags & SKBEDIT_F_PRIORITY) 53 skb->priority = params->priority; 54 if (params->flags & SKBEDIT_F_INHERITDSFIELD) { 55 int wlen = skb_network_offset(skb); 56 57 switch (skb_protocol(skb, true)) { 58 case htons(ETH_P_IP): 59 wlen += sizeof(struct iphdr); 60 if (!pskb_may_pull(skb, wlen)) 61 goto err; 62 skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2; 63 break; 64 65 case htons(ETH_P_IPV6): 66 wlen += sizeof(struct ipv6hdr); 67 if (!pskb_may_pull(skb, wlen)) 68 goto err; 69 skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2; 70 break; 71 } 72 } 73 if (params->flags & SKBEDIT_F_QUEUE_MAPPING && 74 skb->dev->real_num_tx_queues > params->queue_mapping) { 75 #ifdef CONFIG_NET_EGRESS 76 netdev_xmit_skip_txqueue(true); 77 #endif 78 skb_set_queue_mapping(skb, tcf_skbedit_hash(params, skb)); 79 } 80 if (params->flags & SKBEDIT_F_MARK) { 81 skb->mark &= ~params->mask; 82 skb->mark |= params->mark & params->mask; 83 } 84 if (params->flags & SKBEDIT_F_PTYPE) 85 skb->pkt_type = params->ptype; 86 return action; 87 88 err: 89 qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats)); 90 return TC_ACT_SHOT; 91 } 92 93 static void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes, 94 u64 packets, u64 drops, 95 u64 lastuse, bool hw) 96 { 97 struct tcf_skbedit *d = to_skbedit(a); 98 struct tcf_t *tm = &d->tcf_tm; 99 100 tcf_action_update_stats(a, bytes, packets, drops, hw); 101 tm->lastuse = max_t(u64, tm->lastuse, lastuse); 102 } 103 104 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { 105 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, 106 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, 107 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, 108 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, 109 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) }, 110 [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) }, 111 [TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) }, 112 [TCA_SKBEDIT_QUEUE_MAPPING_MAX] = { .len = sizeof(u16) }, 113 }; 114 115 static int tcf_skbedit_init(struct net *net, struct nlattr *nla, 116 struct nlattr *est, struct tc_action **a, 117 struct tcf_proto *tp, u32 act_flags, 118 struct netlink_ext_ack *extack) 119 { 120 struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id); 121 bool bind = act_flags & TCA_ACT_FLAGS_BIND; 122 struct tcf_skbedit_params *params_new; 123 struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; 124 struct tcf_chain *goto_ch = NULL; 125 struct tc_skbedit *parm; 126 struct tcf_skbedit *d; 127 u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL; 128 u16 *queue_mapping = NULL, *ptype = NULL; 129 u16 mapping_mod = 1; 130 bool exists = false; 131 int ret = 0, err; 132 u32 index; 133 134 if (nla == NULL) 135 return -EINVAL; 136 137 err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla, 138 skbedit_policy, NULL); 139 if (err < 0) 140 return err; 141 142 if (tb[TCA_SKBEDIT_PARMS] == NULL) 143 return -EINVAL; 144 145 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { 146 flags |= SKBEDIT_F_PRIORITY; 147 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); 148 } 149 150 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { 151 flags |= SKBEDIT_F_QUEUE_MAPPING; 152 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); 153 } 154 155 if (tb[TCA_SKBEDIT_PTYPE] != NULL) { 156 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]); 157 if (!skb_pkt_type_ok(*ptype)) 158 return -EINVAL; 159 flags |= SKBEDIT_F_PTYPE; 160 } 161 162 if (tb[TCA_SKBEDIT_MARK] != NULL) { 163 flags |= SKBEDIT_F_MARK; 164 mark = nla_data(tb[TCA_SKBEDIT_MARK]); 165 } 166 167 if (tb[TCA_SKBEDIT_MASK] != NULL) { 168 flags |= SKBEDIT_F_MASK; 169 mask = nla_data(tb[TCA_SKBEDIT_MASK]); 170 } 171 172 if (tb[TCA_SKBEDIT_FLAGS] != NULL) { 173 u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]); 174 175 if (*pure_flags & SKBEDIT_F_TXQ_SKBHASH) { 176 u16 *queue_mapping_max; 177 178 if (!tb[TCA_SKBEDIT_QUEUE_MAPPING] || 179 !tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]) { 180 NL_SET_ERR_MSG_MOD(extack, "Missing required range of queue_mapping."); 181 return -EINVAL; 182 } 183 184 queue_mapping_max = 185 nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]); 186 if (*queue_mapping_max < *queue_mapping) { 187 NL_SET_ERR_MSG_MOD(extack, "The range of queue_mapping is invalid, max < min."); 188 return -EINVAL; 189 } 190 191 mapping_mod = *queue_mapping_max - *queue_mapping + 1; 192 flags |= SKBEDIT_F_TXQ_SKBHASH; 193 } 194 if (*pure_flags & SKBEDIT_F_INHERITDSFIELD) 195 flags |= SKBEDIT_F_INHERITDSFIELD; 196 } 197 198 parm = nla_data(tb[TCA_SKBEDIT_PARMS]); 199 index = parm->index; 200 err = tcf_idr_check_alloc(tn, &index, a, bind); 201 if (err < 0) 202 return err; 203 exists = err; 204 if (exists && bind) 205 return 0; 206 207 if (!flags) { 208 if (exists) 209 tcf_idr_release(*a, bind); 210 else 211 tcf_idr_cleanup(tn, index); 212 return -EINVAL; 213 } 214 215 if (!exists) { 216 ret = tcf_idr_create(tn, index, est, a, 217 &act_skbedit_ops, bind, true, act_flags); 218 if (ret) { 219 tcf_idr_cleanup(tn, index); 220 return ret; 221 } 222 223 d = to_skbedit(*a); 224 ret = ACT_P_CREATED; 225 } else { 226 d = to_skbedit(*a); 227 if (!(act_flags & TCA_ACT_FLAGS_REPLACE)) { 228 tcf_idr_release(*a, bind); 229 return -EEXIST; 230 } 231 } 232 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); 233 if (err < 0) 234 goto release_idr; 235 236 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); 237 if (unlikely(!params_new)) { 238 err = -ENOMEM; 239 goto put_chain; 240 } 241 242 params_new->flags = flags; 243 if (flags & SKBEDIT_F_PRIORITY) 244 params_new->priority = *priority; 245 if (flags & SKBEDIT_F_QUEUE_MAPPING) { 246 params_new->queue_mapping = *queue_mapping; 247 params_new->mapping_mod = mapping_mod; 248 } 249 if (flags & SKBEDIT_F_MARK) 250 params_new->mark = *mark; 251 if (flags & SKBEDIT_F_PTYPE) 252 params_new->ptype = *ptype; 253 /* default behaviour is to use all the bits */ 254 params_new->mask = 0xffffffff; 255 if (flags & SKBEDIT_F_MASK) 256 params_new->mask = *mask; 257 258 spin_lock_bh(&d->tcf_lock); 259 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); 260 params_new = rcu_replace_pointer(d->params, params_new, 261 lockdep_is_held(&d->tcf_lock)); 262 spin_unlock_bh(&d->tcf_lock); 263 if (params_new) 264 kfree_rcu(params_new, rcu); 265 if (goto_ch) 266 tcf_chain_put_by_act(goto_ch); 267 268 return ret; 269 put_chain: 270 if (goto_ch) 271 tcf_chain_put_by_act(goto_ch); 272 release_idr: 273 tcf_idr_release(*a, bind); 274 return err; 275 } 276 277 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, 278 int bind, int ref) 279 { 280 unsigned char *b = skb_tail_pointer(skb); 281 struct tcf_skbedit *d = to_skbedit(a); 282 struct tcf_skbedit_params *params; 283 struct tc_skbedit opt = { 284 .index = d->tcf_index, 285 .refcnt = refcount_read(&d->tcf_refcnt) - ref, 286 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind, 287 }; 288 u64 pure_flags = 0; 289 struct tcf_t t; 290 291 spin_lock_bh(&d->tcf_lock); 292 params = rcu_dereference_protected(d->params, 293 lockdep_is_held(&d->tcf_lock)); 294 opt.action = d->tcf_action; 295 296 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) 297 goto nla_put_failure; 298 if ((params->flags & SKBEDIT_F_PRIORITY) && 299 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority)) 300 goto nla_put_failure; 301 if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) && 302 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping)) 303 goto nla_put_failure; 304 if ((params->flags & SKBEDIT_F_MARK) && 305 nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark)) 306 goto nla_put_failure; 307 if ((params->flags & SKBEDIT_F_PTYPE) && 308 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype)) 309 goto nla_put_failure; 310 if ((params->flags & SKBEDIT_F_MASK) && 311 nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask)) 312 goto nla_put_failure; 313 if (params->flags & SKBEDIT_F_INHERITDSFIELD) 314 pure_flags |= SKBEDIT_F_INHERITDSFIELD; 315 if (params->flags & SKBEDIT_F_TXQ_SKBHASH) { 316 if (nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING_MAX, 317 params->queue_mapping + params->mapping_mod - 1)) 318 goto nla_put_failure; 319 320 pure_flags |= SKBEDIT_F_TXQ_SKBHASH; 321 } 322 if (pure_flags != 0 && 323 nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags)) 324 goto nla_put_failure; 325 326 tcf_tm_dump(&t, &d->tcf_tm); 327 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD)) 328 goto nla_put_failure; 329 spin_unlock_bh(&d->tcf_lock); 330 331 return skb->len; 332 333 nla_put_failure: 334 spin_unlock_bh(&d->tcf_lock); 335 nlmsg_trim(skb, b); 336 return -1; 337 } 338 339 static void tcf_skbedit_cleanup(struct tc_action *a) 340 { 341 struct tcf_skbedit *d = to_skbedit(a); 342 struct tcf_skbedit_params *params; 343 344 params = rcu_dereference_protected(d->params, 1); 345 if (params) 346 kfree_rcu(params, rcu); 347 } 348 349 static size_t tcf_skbedit_get_fill_size(const struct tc_action *act) 350 { 351 return nla_total_size(sizeof(struct tc_skbedit)) 352 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */ 353 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */ 354 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING_MAX */ 355 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */ 356 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */ 357 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */ 358 + nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */ 359 } 360 361 static int tcf_skbedit_offload_act_setup(struct tc_action *act, void *entry_data, 362 u32 *index_inc, bool bind, 363 struct netlink_ext_ack *extack) 364 { 365 if (bind) { 366 struct flow_action_entry *entry = entry_data; 367 368 if (is_tcf_skbedit_mark(act)) { 369 entry->id = FLOW_ACTION_MARK; 370 entry->mark = tcf_skbedit_mark(act); 371 } else if (is_tcf_skbedit_ptype(act)) { 372 entry->id = FLOW_ACTION_PTYPE; 373 entry->ptype = tcf_skbedit_ptype(act); 374 } else if (is_tcf_skbedit_priority(act)) { 375 entry->id = FLOW_ACTION_PRIORITY; 376 entry->priority = tcf_skbedit_priority(act); 377 } else if (is_tcf_skbedit_queue_mapping(act)) { 378 NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"queue_mapping\" option is used"); 379 return -EOPNOTSUPP; 380 } else if (is_tcf_skbedit_inheritdsfield(act)) { 381 NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"inheritdsfield\" option is used"); 382 return -EOPNOTSUPP; 383 } else { 384 NL_SET_ERR_MSG_MOD(extack, "Unsupported skbedit option offload"); 385 return -EOPNOTSUPP; 386 } 387 *index_inc = 1; 388 } else { 389 struct flow_offload_action *fl_action = entry_data; 390 391 if (is_tcf_skbedit_mark(act)) 392 fl_action->id = FLOW_ACTION_MARK; 393 else if (is_tcf_skbedit_ptype(act)) 394 fl_action->id = FLOW_ACTION_PTYPE; 395 else if (is_tcf_skbedit_priority(act)) 396 fl_action->id = FLOW_ACTION_PRIORITY; 397 else 398 return -EOPNOTSUPP; 399 } 400 401 return 0; 402 } 403 404 static struct tc_action_ops act_skbedit_ops = { 405 .kind = "skbedit", 406 .id = TCA_ID_SKBEDIT, 407 .owner = THIS_MODULE, 408 .act = tcf_skbedit_act, 409 .stats_update = tcf_skbedit_stats_update, 410 .dump = tcf_skbedit_dump, 411 .init = tcf_skbedit_init, 412 .cleanup = tcf_skbedit_cleanup, 413 .get_fill_size = tcf_skbedit_get_fill_size, 414 .offload_act_setup = tcf_skbedit_offload_act_setup, 415 .size = sizeof(struct tcf_skbedit), 416 }; 417 418 static __net_init int skbedit_init_net(struct net *net) 419 { 420 struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id); 421 422 return tc_action_net_init(net, tn, &act_skbedit_ops); 423 } 424 425 static void __net_exit skbedit_exit_net(struct list_head *net_list) 426 { 427 tc_action_net_exit(net_list, act_skbedit_ops.net_id); 428 } 429 430 static struct pernet_operations skbedit_net_ops = { 431 .init = skbedit_init_net, 432 .exit_batch = skbedit_exit_net, 433 .id = &act_skbedit_ops.net_id, 434 .size = sizeof(struct tc_action_net), 435 }; 436 437 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); 438 MODULE_DESCRIPTION("SKB Editing"); 439 MODULE_LICENSE("GPL"); 440 441 static int __init skbedit_init_module(void) 442 { 443 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops); 444 } 445 446 static void __exit skbedit_cleanup_module(void) 447 { 448 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops); 449 } 450 451 module_init(skbedit_init_module); 452 module_exit(skbedit_cleanup_module); 453