| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * net/sched/cls_flow.c Generic flow classifier |
| 4 | * |
| 5 | * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net> |
| 6 | */ |
| 7 | |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/list.h> |
| 11 | #include <linux/jhash.h> |
| 12 | #include <linux/random.h> |
| 13 | #include <linux/pkt_cls.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/in.h> |
| 16 | #include <linux/ip.h> |
| 17 | #include <linux/ipv6.h> |
| 18 | #include <linux/if_vlan.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <net/inet_sock.h> |
| 22 | |
| 23 | #include <net/pkt_cls.h> |
| 24 | #include <net/ip.h> |
| 25 | #include <net/route.h> |
| 26 | #include <net/flow_dissector.h> |
| 27 | #include <net/tc_wrapper.h> |
| 28 | |
| 29 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| 30 | #include <net/netfilter/nf_conntrack.h> |
| 31 | #endif |
| 32 | |
| 33 | struct flow_head { |
| 34 | struct list_head filters; |
| 35 | struct rcu_head rcu; |
| 36 | }; |
| 37 | |
| 38 | struct flow_filter { |
| 39 | struct list_head list; |
| 40 | struct tcf_exts exts; |
| 41 | struct tcf_ematch_tree ematches; |
| 42 | struct tcf_proto *tp; |
| 43 | struct timer_list perturb_timer; |
| 44 | u32 perturb_period; |
| 45 | u32 handle; |
| 46 | |
| 47 | u32 nkeys; |
| 48 | u32 keymask; |
| 49 | u32 mode; |
| 50 | u32 mask; |
| 51 | u32 xor; |
| 52 | u32 rshift; |
| 53 | u32 addend; |
| 54 | u32 divisor; |
| 55 | u32 baseclass; |
| 56 | u32 hashrnd; |
| 57 | struct rcu_work rwork; |
| 58 | }; |
| 59 | |
| 60 | static inline u32 addr_fold(void *addr) |
| 61 | { |
| 62 | unsigned long a = (unsigned long)addr; |
| 63 | |
| 64 | return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0); |
| 65 | } |
| 66 | |
| 67 | static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow) |
| 68 | { |
| 69 | __be32 src = flow_get_u32_src(flow); |
| 70 | |
| 71 | if (src) |
| 72 | return ntohl(src); |
| 73 | |
| 74 | return addr_fold(skb->sk); |
| 75 | } |
| 76 | |
| 77 | static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
| 78 | { |
| 79 | __be32 dst = flow_get_u32_dst(flow); |
| 80 | |
| 81 | if (dst) |
| 82 | return ntohl(dst); |
| 83 | |
| 84 | return addr_fold(skb_dst(skb)) ^ (__force u16)skb_protocol(skb, true); |
| 85 | } |
| 86 | |
| 87 | static u32 flow_get_proto(const struct sk_buff *skb, |
| 88 | const struct flow_keys *flow) |
| 89 | { |
| 90 | return flow->basic.ip_proto; |
| 91 | } |
| 92 | |
| 93 | static u32 flow_get_proto_src(const struct sk_buff *skb, |
| 94 | const struct flow_keys *flow) |
| 95 | { |
| 96 | if (flow->ports.ports) |
| 97 | return ntohs(flow->ports.src); |
| 98 | |
| 99 | return addr_fold(skb->sk); |
| 100 | } |
| 101 | |
| 102 | static u32 flow_get_proto_dst(const struct sk_buff *skb, |
| 103 | const struct flow_keys *flow) |
| 104 | { |
| 105 | if (flow->ports.ports) |
| 106 | return ntohs(flow->ports.dst); |
| 107 | |
| 108 | return addr_fold(skb_dst(skb)) ^ (__force u16)skb_protocol(skb, true); |
| 109 | } |
| 110 | |
| 111 | static u32 flow_get_iif(const struct sk_buff *skb) |
| 112 | { |
| 113 | return skb->skb_iif; |
| 114 | } |
| 115 | |
| 116 | static u32 flow_get_priority(const struct sk_buff *skb) |
| 117 | { |
| 118 | return skb->priority; |
| 119 | } |
| 120 | |
| 121 | static u32 flow_get_mark(const struct sk_buff *skb) |
| 122 | { |
| 123 | return skb->mark; |
| 124 | } |
| 125 | |
| 126 | static u32 flow_get_nfct(const struct sk_buff *skb) |
| 127 | { |
| 128 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| 129 | return addr_fold(skb_nfct(skb)); |
| 130 | #else |
| 131 | return 0; |
| 132 | #endif |
| 133 | } |
| 134 | |
| 135 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| 136 | #define CTTUPLE(skb, member) \ |
| 137 | ({ \ |
| 138 | enum ip_conntrack_info ctinfo; \ |
| 139 | const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \ |
| 140 | if (ct == NULL) \ |
| 141 | goto fallback; \ |
| 142 | ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \ |
| 143 | }) |
| 144 | #else |
| 145 | #define CTTUPLE(skb, member) \ |
| 146 | ({ \ |
| 147 | goto fallback; \ |
| 148 | 0; \ |
| 149 | }) |
| 150 | #endif |
| 151 | |
| 152 | static u32 flow_get_nfct_src(const struct sk_buff *skb, |
| 153 | const struct flow_keys *flow) |
| 154 | { |
| 155 | switch (skb_protocol(skb, true)) { |
| 156 | case htons(ETH_P_IP): |
| 157 | return ntohl(CTTUPLE(skb, src.u3.ip)); |
| 158 | case htons(ETH_P_IPV6): |
| 159 | return ntohl(CTTUPLE(skb, src.u3.ip6[3])); |
| 160 | } |
| 161 | fallback: |
| 162 | return flow_get_src(skb, flow); |
| 163 | } |
| 164 | |
| 165 | static u32 flow_get_nfct_dst(const struct sk_buff *skb, |
| 166 | const struct flow_keys *flow) |
| 167 | { |
| 168 | switch (skb_protocol(skb, true)) { |
| 169 | case htons(ETH_P_IP): |
| 170 | return ntohl(CTTUPLE(skb, dst.u3.ip)); |
| 171 | case htons(ETH_P_IPV6): |
| 172 | return ntohl(CTTUPLE(skb, dst.u3.ip6[3])); |
| 173 | } |
| 174 | fallback: |
| 175 | return flow_get_dst(skb, flow); |
| 176 | } |
| 177 | |
| 178 | static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, |
| 179 | const struct flow_keys *flow) |
| 180 | { |
| 181 | return ntohs(CTTUPLE(skb, src.u.all)); |
| 182 | fallback: |
| 183 | return flow_get_proto_src(skb, flow); |
| 184 | } |
| 185 | |
| 186 | static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, |
| 187 | const struct flow_keys *flow) |
| 188 | { |
| 189 | return ntohs(CTTUPLE(skb, dst.u.all)); |
| 190 | fallback: |
| 191 | return flow_get_proto_dst(skb, flow); |
| 192 | } |
| 193 | |
| 194 | static u32 flow_get_rtclassid(const struct sk_buff *skb) |
| 195 | { |
| 196 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 197 | if (skb_dst(skb)) |
| 198 | return skb_dst(skb)->tclassid; |
| 199 | #endif |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | static u32 flow_get_skuid(const struct sk_buff *skb) |
| 204 | { |
| 205 | struct sock *sk = skb_to_full_sk(skb); |
| 206 | |
| 207 | if (sk && sk->sk_socket && sk->sk_socket->file) { |
| 208 | kuid_t skuid = sk->sk_socket->file->f_cred->fsuid; |
| 209 | |
| 210 | return from_kuid(&init_user_ns, skuid); |
| 211 | } |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | static u32 flow_get_skgid(const struct sk_buff *skb) |
| 216 | { |
| 217 | struct sock *sk = skb_to_full_sk(skb); |
| 218 | |
| 219 | if (sk && sk->sk_socket && sk->sk_socket->file) { |
| 220 | kgid_t skgid = sk->sk_socket->file->f_cred->fsgid; |
| 221 | |
| 222 | return from_kgid(&init_user_ns, skgid); |
| 223 | } |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | static u32 flow_get_vlan_tag(const struct sk_buff *skb) |
| 228 | { |
| 229 | u16 tag; |
| 230 | |
| 231 | if (vlan_get_tag(skb, &tag) < 0) |
| 232 | return 0; |
| 233 | return tag & VLAN_VID_MASK; |
| 234 | } |
| 235 | |
| 236 | static u32 flow_get_rxhash(struct sk_buff *skb) |
| 237 | { |
| 238 | return skb_get_hash(skb); |
| 239 | } |
| 240 | |
| 241 | static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow) |
| 242 | { |
| 243 | switch (key) { |
| 244 | case FLOW_KEY_SRC: |
| 245 | return flow_get_src(skb, flow); |
| 246 | case FLOW_KEY_DST: |
| 247 | return flow_get_dst(skb, flow); |
| 248 | case FLOW_KEY_PROTO: |
| 249 | return flow_get_proto(skb, flow); |
| 250 | case FLOW_KEY_PROTO_SRC: |
| 251 | return flow_get_proto_src(skb, flow); |
| 252 | case FLOW_KEY_PROTO_DST: |
| 253 | return flow_get_proto_dst(skb, flow); |
| 254 | case FLOW_KEY_IIF: |
| 255 | return flow_get_iif(skb); |
| 256 | case FLOW_KEY_PRIORITY: |
| 257 | return flow_get_priority(skb); |
| 258 | case FLOW_KEY_MARK: |
| 259 | return flow_get_mark(skb); |
| 260 | case FLOW_KEY_NFCT: |
| 261 | return flow_get_nfct(skb); |
| 262 | case FLOW_KEY_NFCT_SRC: |
| 263 | return flow_get_nfct_src(skb, flow); |
| 264 | case FLOW_KEY_NFCT_DST: |
| 265 | return flow_get_nfct_dst(skb, flow); |
| 266 | case FLOW_KEY_NFCT_PROTO_SRC: |
| 267 | return flow_get_nfct_proto_src(skb, flow); |
| 268 | case FLOW_KEY_NFCT_PROTO_DST: |
| 269 | return flow_get_nfct_proto_dst(skb, flow); |
| 270 | case FLOW_KEY_RTCLASSID: |
| 271 | return flow_get_rtclassid(skb); |
| 272 | case FLOW_KEY_SKUID: |
| 273 | return flow_get_skuid(skb); |
| 274 | case FLOW_KEY_SKGID: |
| 275 | return flow_get_skgid(skb); |
| 276 | case FLOW_KEY_VLAN_TAG: |
| 277 | return flow_get_vlan_tag(skb); |
| 278 | case FLOW_KEY_RXHASH: |
| 279 | return flow_get_rxhash(skb); |
| 280 | default: |
| 281 | WARN_ON(1); |
| 282 | return 0; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | #define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \ |
| 287 | (1 << FLOW_KEY_DST) | \ |
| 288 | (1 << FLOW_KEY_PROTO) | \ |
| 289 | (1 << FLOW_KEY_PROTO_SRC) | \ |
| 290 | (1 << FLOW_KEY_PROTO_DST) | \ |
| 291 | (1 << FLOW_KEY_NFCT_SRC) | \ |
| 292 | (1 << FLOW_KEY_NFCT_DST) | \ |
| 293 | (1 << FLOW_KEY_NFCT_PROTO_SRC) | \ |
| 294 | (1 << FLOW_KEY_NFCT_PROTO_DST)) |
| 295 | |
| 296 | TC_INDIRECT_SCOPE int flow_classify(struct sk_buff *skb, |
| 297 | const struct tcf_proto *tp, |
| 298 | struct tcf_result *res) |
| 299 | { |
| 300 | struct flow_head *head = rcu_dereference_bh(tp->root); |
| 301 | struct flow_filter *f; |
| 302 | u32 keymask; |
| 303 | u32 classid; |
| 304 | unsigned int n, key; |
| 305 | int r; |
| 306 | |
| 307 | list_for_each_entry_rcu(f, &head->filters, list) { |
| 308 | u32 keys[FLOW_KEY_MAX + 1]; |
| 309 | struct flow_keys flow_keys; |
| 310 | |
| 311 | if (!tcf_em_tree_match(skb, &f->ematches, NULL)) |
| 312 | continue; |
| 313 | |
| 314 | keymask = f->keymask; |
| 315 | if (keymask & FLOW_KEYS_NEEDED) |
| 316 | skb_flow_dissect_flow_keys(skb, &flow_keys, 0); |
| 317 | |
| 318 | for (n = 0; n < f->nkeys; n++) { |
| 319 | key = ffs(keymask) - 1; |
| 320 | keymask &= ~(1 << key); |
| 321 | keys[n] = flow_key_get(skb, key, &flow_keys); |
| 322 | } |
| 323 | |
| 324 | if (f->mode == FLOW_MODE_HASH) |
| 325 | classid = jhash2(keys, f->nkeys, f->hashrnd); |
| 326 | else { |
| 327 | classid = keys[0]; |
| 328 | classid = (classid & f->mask) ^ f->xor; |
| 329 | classid = (classid >> f->rshift) + f->addend; |
| 330 | } |
| 331 | |
| 332 | if (f->divisor) |
| 333 | classid %= f->divisor; |
| 334 | |
| 335 | res->class = 0; |
| 336 | res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid); |
| 337 | |
| 338 | r = tcf_exts_exec(skb, &f->exts, res); |
| 339 | if (r < 0) |
| 340 | continue; |
| 341 | return r; |
| 342 | } |
| 343 | return -1; |
| 344 | } |
| 345 | |
| 346 | static void flow_perturbation(struct timer_list *t) |
| 347 | { |
| 348 | struct flow_filter *f = from_timer(f, t, perturb_timer); |
| 349 | |
| 350 | get_random_bytes(&f->hashrnd, 4); |
| 351 | if (f->perturb_period) |
| 352 | mod_timer(&f->perturb_timer, jiffies + f->perturb_period); |
| 353 | } |
| 354 | |
| 355 | static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = { |
| 356 | [TCA_FLOW_KEYS] = { .type = NLA_U32 }, |
| 357 | [TCA_FLOW_MODE] = { .type = NLA_U32 }, |
| 358 | [TCA_FLOW_BASECLASS] = { .type = NLA_U32 }, |
| 359 | [TCA_FLOW_RSHIFT] = { .type = NLA_U32 }, |
| 360 | [TCA_FLOW_ADDEND] = { .type = NLA_U32 }, |
| 361 | [TCA_FLOW_MASK] = { .type = NLA_U32 }, |
| 362 | [TCA_FLOW_XOR] = { .type = NLA_U32 }, |
| 363 | [TCA_FLOW_DIVISOR] = { .type = NLA_U32 }, |
| 364 | [TCA_FLOW_ACT] = { .type = NLA_NESTED }, |
| 365 | [TCA_FLOW_POLICE] = { .type = NLA_NESTED }, |
| 366 | [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED }, |
| 367 | [TCA_FLOW_PERTURB] = { .type = NLA_U32 }, |
| 368 | }; |
| 369 | |
| 370 | static void __flow_destroy_filter(struct flow_filter *f) |
| 371 | { |
| 372 | timer_shutdown_sync(&f->perturb_timer); |
| 373 | tcf_exts_destroy(&f->exts); |
| 374 | tcf_em_tree_destroy(&f->ematches); |
| 375 | tcf_exts_put_net(&f->exts); |
| 376 | kfree(f); |
| 377 | } |
| 378 | |
| 379 | static void flow_destroy_filter_work(struct work_struct *work) |
| 380 | { |
| 381 | struct flow_filter *f = container_of(to_rcu_work(work), |
| 382 | struct flow_filter, |
| 383 | rwork); |
| 384 | rtnl_lock(); |
| 385 | __flow_destroy_filter(f); |
| 386 | rtnl_unlock(); |
| 387 | } |
| 388 | |
| 389 | static int flow_change(struct net *net, struct sk_buff *in_skb, |
| 390 | struct tcf_proto *tp, unsigned long base, |
| 391 | u32 handle, struct nlattr **tca, |
| 392 | void **arg, u32 flags, |
| 393 | struct netlink_ext_ack *extack) |
| 394 | { |
| 395 | struct flow_head *head = rtnl_dereference(tp->root); |
| 396 | struct flow_filter *fold, *fnew; |
| 397 | struct nlattr *opt = tca[TCA_OPTIONS]; |
| 398 | struct nlattr *tb[TCA_FLOW_MAX + 1]; |
| 399 | unsigned int nkeys = 0; |
| 400 | unsigned int perturb_period = 0; |
| 401 | u32 baseclass = 0; |
| 402 | u32 keymask = 0; |
| 403 | u32 mode; |
| 404 | int err; |
| 405 | |
| 406 | if (opt == NULL) |
| 407 | return -EINVAL; |
| 408 | |
| 409 | err = nla_parse_nested_deprecated(tb, TCA_FLOW_MAX, opt, flow_policy, |
| 410 | NULL); |
| 411 | if (err < 0) |
| 412 | return err; |
| 413 | |
| 414 | if (tb[TCA_FLOW_BASECLASS]) { |
| 415 | baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]); |
| 416 | if (TC_H_MIN(baseclass) == 0) |
| 417 | return -EINVAL; |
| 418 | } |
| 419 | |
| 420 | if (tb[TCA_FLOW_KEYS]) { |
| 421 | keymask = nla_get_u32(tb[TCA_FLOW_KEYS]); |
| 422 | |
| 423 | nkeys = hweight32(keymask); |
| 424 | if (nkeys == 0) |
| 425 | return -EINVAL; |
| 426 | |
| 427 | if (fls(keymask) - 1 > FLOW_KEY_MAX) |
| 428 | return -EOPNOTSUPP; |
| 429 | |
| 430 | if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) && |
| 431 | sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns) |
| 432 | return -EOPNOTSUPP; |
| 433 | } |
| 434 | |
| 435 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
| 436 | if (!fnew) |
| 437 | return -ENOBUFS; |
| 438 | |
| 439 | err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &fnew->ematches); |
| 440 | if (err < 0) |
| 441 | goto err1; |
| 442 | |
| 443 | err = tcf_exts_init(&fnew->exts, net, TCA_FLOW_ACT, TCA_FLOW_POLICE); |
| 444 | if (err < 0) |
| 445 | goto err2; |
| 446 | |
| 447 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, flags, |
| 448 | extack); |
| 449 | if (err < 0) |
| 450 | goto err2; |
| 451 | |
| 452 | fold = *arg; |
| 453 | if (fold) { |
| 454 | err = -EINVAL; |
| 455 | if (fold->handle != handle && handle) |
| 456 | goto err2; |
| 457 | |
| 458 | /* Copy fold into fnew */ |
| 459 | fnew->tp = fold->tp; |
| 460 | fnew->handle = fold->handle; |
| 461 | fnew->nkeys = fold->nkeys; |
| 462 | fnew->keymask = fold->keymask; |
| 463 | fnew->mode = fold->mode; |
| 464 | fnew->mask = fold->mask; |
| 465 | fnew->xor = fold->xor; |
| 466 | fnew->rshift = fold->rshift; |
| 467 | fnew->addend = fold->addend; |
| 468 | fnew->divisor = fold->divisor; |
| 469 | fnew->baseclass = fold->baseclass; |
| 470 | fnew->hashrnd = fold->hashrnd; |
| 471 | |
| 472 | mode = fold->mode; |
| 473 | if (tb[TCA_FLOW_MODE]) |
| 474 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); |
| 475 | if (mode != FLOW_MODE_HASH && nkeys > 1) |
| 476 | goto err2; |
| 477 | |
| 478 | if (mode == FLOW_MODE_HASH) |
| 479 | perturb_period = fold->perturb_period; |
| 480 | if (tb[TCA_FLOW_PERTURB]) { |
| 481 | if (mode != FLOW_MODE_HASH) |
| 482 | goto err2; |
| 483 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; |
| 484 | } |
| 485 | } else { |
| 486 | err = -EINVAL; |
| 487 | if (!handle) |
| 488 | goto err2; |
| 489 | if (!tb[TCA_FLOW_KEYS]) |
| 490 | goto err2; |
| 491 | |
| 492 | mode = FLOW_MODE_MAP; |
| 493 | if (tb[TCA_FLOW_MODE]) |
| 494 | mode = nla_get_u32(tb[TCA_FLOW_MODE]); |
| 495 | if (mode != FLOW_MODE_HASH && nkeys > 1) |
| 496 | goto err2; |
| 497 | |
| 498 | if (tb[TCA_FLOW_PERTURB]) { |
| 499 | if (mode != FLOW_MODE_HASH) |
| 500 | goto err2; |
| 501 | perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; |
| 502 | } |
| 503 | |
| 504 | if (TC_H_MAJ(baseclass) == 0) { |
| 505 | struct Qdisc *q = tcf_block_q(tp->chain->block); |
| 506 | |
| 507 | baseclass = TC_H_MAKE(q->handle, baseclass); |
| 508 | } |
| 509 | if (TC_H_MIN(baseclass) == 0) |
| 510 | baseclass = TC_H_MAKE(baseclass, 1); |
| 511 | |
| 512 | fnew->handle = handle; |
| 513 | fnew->mask = ~0U; |
| 514 | fnew->tp = tp; |
| 515 | get_random_bytes(&fnew->hashrnd, 4); |
| 516 | } |
| 517 | |
| 518 | timer_setup(&fnew->perturb_timer, flow_perturbation, TIMER_DEFERRABLE); |
| 519 | |
| 520 | tcf_block_netif_keep_dst(tp->chain->block); |
| 521 | |
| 522 | if (tb[TCA_FLOW_KEYS]) { |
| 523 | fnew->keymask = keymask; |
| 524 | fnew->nkeys = nkeys; |
| 525 | } |
| 526 | |
| 527 | fnew->mode = mode; |
| 528 | |
| 529 | if (tb[TCA_FLOW_MASK]) |
| 530 | fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]); |
| 531 | if (tb[TCA_FLOW_XOR]) |
| 532 | fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]); |
| 533 | if (tb[TCA_FLOW_RSHIFT]) |
| 534 | fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]); |
| 535 | if (tb[TCA_FLOW_ADDEND]) |
| 536 | fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]); |
| 537 | |
| 538 | if (tb[TCA_FLOW_DIVISOR]) |
| 539 | fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]); |
| 540 | if (baseclass) |
| 541 | fnew->baseclass = baseclass; |
| 542 | |
| 543 | fnew->perturb_period = perturb_period; |
| 544 | if (perturb_period) |
| 545 | mod_timer(&fnew->perturb_timer, jiffies + perturb_period); |
| 546 | |
| 547 | if (!*arg) |
| 548 | list_add_tail_rcu(&fnew->list, &head->filters); |
| 549 | else |
| 550 | list_replace_rcu(&fold->list, &fnew->list); |
| 551 | |
| 552 | *arg = fnew; |
| 553 | |
| 554 | if (fold) { |
| 555 | tcf_exts_get_net(&fold->exts); |
| 556 | tcf_queue_work(&fold->rwork, flow_destroy_filter_work); |
| 557 | } |
| 558 | return 0; |
| 559 | |
| 560 | err2: |
| 561 | tcf_exts_destroy(&fnew->exts); |
| 562 | tcf_em_tree_destroy(&fnew->ematches); |
| 563 | err1: |
| 564 | kfree(fnew); |
| 565 | return err; |
| 566 | } |
| 567 | |
| 568 | static int flow_delete(struct tcf_proto *tp, void *arg, bool *last, |
| 569 | bool rtnl_held, struct netlink_ext_ack *extack) |
| 570 | { |
| 571 | struct flow_head *head = rtnl_dereference(tp->root); |
| 572 | struct flow_filter *f = arg; |
| 573 | |
| 574 | list_del_rcu(&f->list); |
| 575 | tcf_exts_get_net(&f->exts); |
| 576 | tcf_queue_work(&f->rwork, flow_destroy_filter_work); |
| 577 | *last = list_empty(&head->filters); |
| 578 | return 0; |
| 579 | } |
| 580 | |
| 581 | static int flow_init(struct tcf_proto *tp) |
| 582 | { |
| 583 | struct flow_head *head; |
| 584 | |
| 585 | head = kzalloc(sizeof(*head), GFP_KERNEL); |
| 586 | if (head == NULL) |
| 587 | return -ENOBUFS; |
| 588 | INIT_LIST_HEAD(&head->filters); |
| 589 | rcu_assign_pointer(tp->root, head); |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | static void flow_destroy(struct tcf_proto *tp, bool rtnl_held, |
| 594 | struct netlink_ext_ack *extack) |
| 595 | { |
| 596 | struct flow_head *head = rtnl_dereference(tp->root); |
| 597 | struct flow_filter *f, *next; |
| 598 | |
| 599 | list_for_each_entry_safe(f, next, &head->filters, list) { |
| 600 | list_del_rcu(&f->list); |
| 601 | if (tcf_exts_get_net(&f->exts)) |
| 602 | tcf_queue_work(&f->rwork, flow_destroy_filter_work); |
| 603 | else |
| 604 | __flow_destroy_filter(f); |
| 605 | } |
| 606 | kfree_rcu(head, rcu); |
| 607 | } |
| 608 | |
| 609 | static void *flow_get(struct tcf_proto *tp, u32 handle) |
| 610 | { |
| 611 | struct flow_head *head = rtnl_dereference(tp->root); |
| 612 | struct flow_filter *f; |
| 613 | |
| 614 | list_for_each_entry(f, &head->filters, list) |
| 615 | if (f->handle == handle) |
| 616 | return f; |
| 617 | return NULL; |
| 618 | } |
| 619 | |
| 620 | static int flow_dump(struct net *net, struct tcf_proto *tp, void *fh, |
| 621 | struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) |
| 622 | { |
| 623 | struct flow_filter *f = fh; |
| 624 | struct nlattr *nest; |
| 625 | |
| 626 | if (f == NULL) |
| 627 | return skb->len; |
| 628 | |
| 629 | t->tcm_handle = f->handle; |
| 630 | |
| 631 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
| 632 | if (nest == NULL) |
| 633 | goto nla_put_failure; |
| 634 | |
| 635 | if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) || |
| 636 | nla_put_u32(skb, TCA_FLOW_MODE, f->mode)) |
| 637 | goto nla_put_failure; |
| 638 | |
| 639 | if (f->mask != ~0 || f->xor != 0) { |
| 640 | if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) || |
| 641 | nla_put_u32(skb, TCA_FLOW_XOR, f->xor)) |
| 642 | goto nla_put_failure; |
| 643 | } |
| 644 | if (f->rshift && |
| 645 | nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift)) |
| 646 | goto nla_put_failure; |
| 647 | if (f->addend && |
| 648 | nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend)) |
| 649 | goto nla_put_failure; |
| 650 | |
| 651 | if (f->divisor && |
| 652 | nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor)) |
| 653 | goto nla_put_failure; |
| 654 | if (f->baseclass && |
| 655 | nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass)) |
| 656 | goto nla_put_failure; |
| 657 | |
| 658 | if (f->perturb_period && |
| 659 | nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ)) |
| 660 | goto nla_put_failure; |
| 661 | |
| 662 | if (tcf_exts_dump(skb, &f->exts) < 0) |
| 663 | goto nla_put_failure; |
| 664 | #ifdef CONFIG_NET_EMATCH |
| 665 | if (f->ematches.hdr.nmatches && |
| 666 | tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0) |
| 667 | goto nla_put_failure; |
| 668 | #endif |
| 669 | nla_nest_end(skb, nest); |
| 670 | |
| 671 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
| 672 | goto nla_put_failure; |
| 673 | |
| 674 | return skb->len; |
| 675 | |
| 676 | nla_put_failure: |
| 677 | nla_nest_cancel(skb, nest); |
| 678 | return -1; |
| 679 | } |
| 680 | |
| 681 | static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
| 682 | bool rtnl_held) |
| 683 | { |
| 684 | struct flow_head *head = rtnl_dereference(tp->root); |
| 685 | struct flow_filter *f; |
| 686 | |
| 687 | list_for_each_entry(f, &head->filters, list) { |
| 688 | if (!tc_cls_stats_dump(tp, arg, f)) |
| 689 | break; |
| 690 | } |
| 691 | } |
| 692 | |
| 693 | static struct tcf_proto_ops cls_flow_ops __read_mostly = { |
| 694 | .kind = "flow", |
| 695 | .classify = flow_classify, |
| 696 | .init = flow_init, |
| 697 | .destroy = flow_destroy, |
| 698 | .change = flow_change, |
| 699 | .delete = flow_delete, |
| 700 | .get = flow_get, |
| 701 | .dump = flow_dump, |
| 702 | .walk = flow_walk, |
| 703 | .owner = THIS_MODULE, |
| 704 | }; |
| 705 | MODULE_ALIAS_NET_CLS("flow"); |
| 706 | |
| 707 | static int __init cls_flow_init(void) |
| 708 | { |
| 709 | return register_tcf_proto_ops(&cls_flow_ops); |
| 710 | } |
| 711 | |
| 712 | static void __exit cls_flow_exit(void) |
| 713 | { |
| 714 | unregister_tcf_proto_ops(&cls_flow_ops); |
| 715 | } |
| 716 | |
| 717 | module_init(cls_flow_init); |
| 718 | module_exit(cls_flow_exit); |
| 719 | |
| 720 | MODULE_LICENSE("GPL"); |
| 721 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 722 | MODULE_DESCRIPTION("TC flow classifier"); |