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 #include <net/tc_wrapper.h> 20 21 #include <linux/tc_act/tc_skbedit.h> 22 #include <net/tc_act/tc_skbedit.h> 23 24 static struct tc_action_ops act_skbedit_ops; 25 26 static u16 tcf_skbedit_hash(struct tcf_skbedit_params *params, 27 struct sk_buff *skb) 28 { 29 u16 queue_mapping = params->queue_mapping; 30 31 if (params->flags & SKBEDIT_F_TXQ_SKBHASH) { 32 u32 hash = skb_get_hash(skb); 33 34 queue_mapping += hash % params->mapping_mod; 35 } 36 37 return netdev_cap_txqueue(skb->dev, queue_mapping); 38 } 39 40 TC_INDIRECT_SCOPE int tcf_skbedit_act(struct sk_buff *skb, 41 const struct tc_action *a, 42 struct tcf_result *res) 43 { 44 struct tcf_skbedit *d = to_skbedit(a); 45 struct tcf_skbedit_params *params; 46 int action; 47 48 tcf_lastuse_update(&d->tcf_tm); 49 bstats_update(this_cpu_ptr(d->common.cpu_bstats), skb); 50 51 params = rcu_dereference_bh(d->params); 52 action = READ_ONCE(d->tcf_action); 53 54 if (params->flags & SKBEDIT_F_PRIORITY) 55 skb->priority = params->priority; 56 if (params->flags & SKBEDIT_F_INHERITDSFIELD) { 57 int wlen = skb_network_offset(skb); 58 59 switch (skb_protocol(skb, true)) { 60 case htons(ETH_P_IP): 61 wlen += sizeof(struct iphdr); 62 if (!pskb_may_pull(skb, wlen)) 63 goto err; 64 skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2; 65 break; 66 67 case htons(ETH_P_IPV6): 68 wlen += sizeof(struct ipv6hdr); 69 if (!pskb_may_pull(skb, wlen)) 70 goto err; 71 skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2; 72 break; 73 } 74 } 75 if (params->flags & SKBEDIT_F_QUEUE_MAPPING && 76 skb->dev->real_num_tx_queues > params->queue_mapping) { 77 #ifdef CONFIG_NET_EGRESS 78 netdev_xmit_skip_txqueue(true); 79 #endif 80 skb_set_queue_mapping(skb, tcf_skbedit_hash(params, skb)); 81 } 82 if (params->flags & SKBEDIT_F_MARK) { 83 skb->mark &= ~params->mask; 84 skb->mark |= params->mark & params->mask; 85 } 86 if (params->flags & SKBEDIT_F_PTYPE) 87 skb->pkt_type = params->ptype; 88 return action; 89 90 err: 91 qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats)); 92 return TC_ACT_SHOT; 93 } 94 95 static void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes, 96 u64 packets, u64 drops, 97 u64 lastuse, bool hw) 98 { 99 struct tcf_skbedit *d = to_skbedit(a); 100 struct tcf_t *tm = &d->tcf_tm; 101 102 tcf_action_update_stats(a, bytes, packets, drops, hw); 103 tm->lastuse = max_t(u64, tm->lastuse, lastuse); 104 } 105 106 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { 107 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, 108 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, 109 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, 110 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, 111 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) }, 112 [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) }, 113 [TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) }, 114 [TCA_SKBEDIT_QUEUE_MAPPING_MAX] = { .len = sizeof(u16) }, 115 }; 116 117 static int tcf_skbedit_init(struct net *net, struct nlattr *nla, 118 struct nlattr *est, struct tc_action **a, 119 struct tcf_proto *tp, u32 act_flags, 120 struct netlink_ext_ack *extack) 121 { 122 struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id); 123 bool bind = act_flags & TCA_ACT_FLAGS_BIND; 124 struct tcf_skbedit_params *params_new; 125 struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; 126 struct tcf_chain *goto_ch = NULL; 127 struct tc_skbedit *parm; 128 struct tcf_skbedit *d; 129 u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL; 130 u16 *queue_mapping = NULL, *ptype = NULL; 131 u16 mapping_mod = 1; 132 bool exists = false; 133 int ret = 0, err; 134 u32 index; 135 136 if (nla == NULL) 137 return -EINVAL; 138 139 err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla, 140 skbedit_policy, NULL); 141 if (err < 0) 142 return err; 143 144 if (tb[TCA_SKBEDIT_PARMS] == NULL) 145 return -EINVAL; 146 147 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { 148 flags |= SKBEDIT_F_PRIORITY; 149 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); 150 } 151 152 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { 153 if (is_tcf_skbedit_ingress(act_flags) && 154 !(act_flags & TCA_ACT_FLAGS_SKIP_SW)) { 155 NL_SET_ERR_MSG_MOD(extack, "\"queue_mapping\" option on receive side is hardware only, use skip_sw"); 156 return -EOPNOTSUPP; 157 } 158 flags |= SKBEDIT_F_QUEUE_MAPPING; 159 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); 160 } 161 162 if (tb[TCA_SKBEDIT_PTYPE] != NULL) { 163 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]); 164 if (!skb_pkt_type_ok(*ptype)) 165 return -EINVAL; 166 flags |= SKBEDIT_F_PTYPE; 167 } 168 169 if (tb[TCA_SKBEDIT_MARK] != NULL) { 170 flags |= SKBEDIT_F_MARK; 171 mark = nla_data(tb[TCA_SKBEDIT_MARK]); 172 } 173 174 if (tb[TCA_SKBEDIT_MASK] != NULL) { 175 flags |= SKBEDIT_F_MASK; 176 mask = nla_data(tb[TCA_SKBEDIT_MASK]); 177 } 178 179 if (tb[TCA_SKBEDIT_FLAGS] != NULL) { 180 u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]); 181 182 if (*pure_flags & SKBEDIT_F_TXQ_SKBHASH) { 183 u16 *queue_mapping_max; 184 185 if (!tb[TCA_SKBEDIT_QUEUE_MAPPING] || 186 !tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]) { 187 NL_SET_ERR_MSG_MOD(extack, "Missing required range of queue_mapping."); 188 return -EINVAL; 189 } 190 191 queue_mapping_max = 192 nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]); 193 if (*queue_mapping_max < *queue_mapping) { 194 NL_SET_ERR_MSG_MOD(extack, "The range of queue_mapping is invalid, max < min."); 195 return -EINVAL; 196 } 197 198 mapping_mod = *queue_mapping_max - *queue_mapping + 1; 199 flags |= SKBEDIT_F_TXQ_SKBHASH; 200 } 201 if (*pure_flags & SKBEDIT_F_INHERITDSFIELD) 202 flags |= SKBEDIT_F_INHERITDSFIELD; 203 } 204 205 parm = nla_data(tb[TCA_SKBEDIT_PARMS]); 206 index = parm->index; 207 err = tcf_idr_check_alloc(tn, &index, a, bind); 208 if (err < 0) 209 return err; 210 exists = err; 211 if (exists && bind) 212 return 0; 213 214 if (!flags) { 215 if (exists) 216 tcf_idr_release(*a, bind); 217 else 218 tcf_idr_cleanup(tn, index); 219 return -EINVAL; 220 } 221 222 if (!exists) { 223 ret = tcf_idr_create(tn, index, est, a, 224 &act_skbedit_ops, bind, true, act_flags); 225 if (ret) { 226 tcf_idr_cleanup(tn, index); 227 return ret; 228 } 229 230 d = to_skbedit(*a); 231 ret = ACT_P_CREATED; 232 } else { 233 d = to_skbedit(*a); 234 if (!(act_flags & TCA_ACT_FLAGS_REPLACE)) { 235 tcf_idr_release(*a, bind); 236 return -EEXIST; 237 } 238 } 239 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); 240 if (err < 0) 241 goto release_idr; 242 243 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); 244 if (unlikely(!params_new)) { 245 err = -ENOMEM; 246 goto put_chain; 247 } 248 249 params_new->flags = flags; 250 if (flags & SKBEDIT_F_PRIORITY) 251 params_new->priority = *priority; 252 if (flags & SKBEDIT_F_QUEUE_MAPPING) { 253 params_new->queue_mapping = *queue_mapping; 254 params_new->mapping_mod = mapping_mod; 255 } 256 if (flags & SKBEDIT_F_MARK) 257 params_new->mark = *mark; 258 if (flags & SKBEDIT_F_PTYPE) 259 params_new->ptype = *ptype; 260 /* default behaviour is to use all the bits */ 261 params_new->mask = 0xffffffff; 262 if (flags & SKBEDIT_F_MASK) 263 params_new->mask = *mask; 264 265 spin_lock_bh(&d->tcf_lock); 266 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); 267 params_new = rcu_replace_pointer(d->params, params_new, 268 lockdep_is_held(&d->tcf_lock)); 269 spin_unlock_bh(&d->tcf_lock); 270 if (params_new) 271 kfree_rcu(params_new, rcu); 272 if (goto_ch) 273 tcf_chain_put_by_act(goto_ch); 274 275 return ret; 276 put_chain: 277 if (goto_ch) 278 tcf_chain_put_by_act(goto_ch); 279 release_idr: 280 tcf_idr_release(*a, bind); 281 return err; 282 } 283 284 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, 285 int bind, int ref) 286 { 287 unsigned char *b = skb_tail_pointer(skb); 288 struct tcf_skbedit *d = to_skbedit(a); 289 struct tcf_skbedit_params *params; 290 struct tc_skbedit opt = { 291 .index = d->tcf_index, 292 .refcnt = refcount_read(&d->tcf_refcnt) - ref, 293 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind, 294 }; 295 u64 pure_flags = 0; 296 struct tcf_t t; 297 298 spin_lock_bh(&d->tcf_lock); 299 params = rcu_dereference_protected(d->params, 300 lockdep_is_held(&d->tcf_lock)); 301 opt.action = d->tcf_action; 302 303 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) 304 goto nla_put_failure; 305 if ((params->flags & SKBEDIT_F_PRIORITY) && 306 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority)) 307 goto nla_put_failure; 308 if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) && 309 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping)) 310 goto nla_put_failure; 311 if ((params->flags & SKBEDIT_F_MARK) && 312 nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark)) 313 goto nla_put_failure; 314 if ((params->flags & SKBEDIT_F_PTYPE) && 315 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype)) 316 goto nla_put_failure; 317 if ((params->flags & SKBEDIT_F_MASK) && 318 nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask)) 319 goto nla_put_failure; 320 if (params->flags & SKBEDIT_F_INHERITDSFIELD) 321 pure_flags |= SKBEDIT_F_INHERITDSFIELD; 322 if (params->flags & SKBEDIT_F_TXQ_SKBHASH) { 323 if (nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING_MAX, 324 params->queue_mapping + params->mapping_mod - 1)) 325 goto nla_put_failure; 326 327 pure_flags |= SKBEDIT_F_TXQ_SKBHASH; 328 } 329 if (pure_flags != 0 && 330 nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags)) 331 goto nla_put_failure; 332 333 tcf_tm_dump(&t, &d->tcf_tm); 334 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD)) 335 goto nla_put_failure; 336 spin_unlock_bh(&d->tcf_lock); 337 338 return skb->len; 339 340 nla_put_failure: 341 spin_unlock_bh(&d->tcf_lock); 342 nlmsg_trim(skb, b); 343 return -1; 344 } 345 346 static void tcf_skbedit_cleanup(struct tc_action *a) 347 { 348 struct tcf_skbedit *d = to_skbedit(a); 349 struct tcf_skbedit_params *params; 350 351 params = rcu_dereference_protected(d->params, 1); 352 if (params) 353 kfree_rcu(params, rcu); 354 } 355 356 static size_t tcf_skbedit_get_fill_size(const struct tc_action *act) 357 { 358 return nla_total_size(sizeof(struct tc_skbedit)) 359 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */ 360 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */ 361 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING_MAX */ 362 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */ 363 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */ 364 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */ 365 + nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */ 366 } 367 368 static int tcf_skbedit_offload_act_setup(struct tc_action *act, void *entry_data, 369 u32 *index_inc, bool bind, 370 struct netlink_ext_ack *extack) 371 { 372 if (bind) { 373 struct flow_action_entry *entry = entry_data; 374 375 if (is_tcf_skbedit_mark(act)) { 376 entry->id = FLOW_ACTION_MARK; 377 entry->mark = tcf_skbedit_mark(act); 378 } else if (is_tcf_skbedit_ptype(act)) { 379 entry->id = FLOW_ACTION_PTYPE; 380 entry->ptype = tcf_skbedit_ptype(act); 381 } else if (is_tcf_skbedit_priority(act)) { 382 entry->id = FLOW_ACTION_PRIORITY; 383 entry->priority = tcf_skbedit_priority(act); 384 } else if (is_tcf_skbedit_tx_queue_mapping(act)) { 385 NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"queue_mapping\" option is used on transmit side"); 386 return -EOPNOTSUPP; 387 } else if (is_tcf_skbedit_rx_queue_mapping(act)) { 388 entry->id = FLOW_ACTION_RX_QUEUE_MAPPING; 389 entry->rx_queue = tcf_skbedit_rx_queue_mapping(act); 390 } else if (is_tcf_skbedit_inheritdsfield(act)) { 391 NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"inheritdsfield\" option is used"); 392 return -EOPNOTSUPP; 393 } else { 394 NL_SET_ERR_MSG_MOD(extack, "Unsupported skbedit option offload"); 395 return -EOPNOTSUPP; 396 } 397 *index_inc = 1; 398 } else { 399 struct flow_offload_action *fl_action = entry_data; 400 401 if (is_tcf_skbedit_mark(act)) 402 fl_action->id = FLOW_ACTION_MARK; 403 else if (is_tcf_skbedit_ptype(act)) 404 fl_action->id = FLOW_ACTION_PTYPE; 405 else if (is_tcf_skbedit_priority(act)) 406 fl_action->id = FLOW_ACTION_PRIORITY; 407 else if (is_tcf_skbedit_rx_queue_mapping(act)) 408 fl_action->id = FLOW_ACTION_RX_QUEUE_MAPPING; 409 else 410 return -EOPNOTSUPP; 411 } 412 413 return 0; 414 } 415 416 static struct tc_action_ops act_skbedit_ops = { 417 .kind = "skbedit", 418 .id = TCA_ID_SKBEDIT, 419 .owner = THIS_MODULE, 420 .act = tcf_skbedit_act, 421 .stats_update = tcf_skbedit_stats_update, 422 .dump = tcf_skbedit_dump, 423 .init = tcf_skbedit_init, 424 .cleanup = tcf_skbedit_cleanup, 425 .get_fill_size = tcf_skbedit_get_fill_size, 426 .offload_act_setup = tcf_skbedit_offload_act_setup, 427 .size = sizeof(struct tcf_skbedit), 428 }; 429 430 static __net_init int skbedit_init_net(struct net *net) 431 { 432 struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id); 433 434 return tc_action_net_init(net, tn, &act_skbedit_ops); 435 } 436 437 static void __net_exit skbedit_exit_net(struct list_head *net_list) 438 { 439 tc_action_net_exit(net_list, act_skbedit_ops.net_id); 440 } 441 442 static struct pernet_operations skbedit_net_ops = { 443 .init = skbedit_init_net, 444 .exit_batch = skbedit_exit_net, 445 .id = &act_skbedit_ops.net_id, 446 .size = sizeof(struct tc_action_net), 447 }; 448 449 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); 450 MODULE_DESCRIPTION("SKB Editing"); 451 MODULE_LICENSE("GPL"); 452 453 static int __init skbedit_init_module(void) 454 { 455 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops); 456 } 457 458 static void __exit skbedit_cleanup_module(void) 459 { 460 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops); 461 } 462 463 module_init(skbedit_init_module); 464 module_exit(skbedit_cleanup_module); 465