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(dev: skb->dev, queue_index: 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(tm: &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, skip_vlan: true)) { |
60 | case htons(ETH_P_IP): |
61 | wlen += sizeof(struct iphdr); |
62 | if (!pskb_may_pull(skb, len: wlen)) |
63 | goto err; |
64 | skb->priority = ipv4_get_dsfield(iph: ip_hdr(skb)) >> 2; |
65 | break; |
66 | |
67 | case htons(ETH_P_IPV6): |
68 | wlen += sizeof(struct ipv6hdr); |
69 | if (!pskb_may_pull(skb, len: wlen)) |
70 | goto err; |
71 | skb->priority = ipv6_get_dsfield(ipv6h: 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(skip: true); |
79 | #endif |
80 | skb_set_queue_mapping(skb, queue_mapping: 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, id: 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 | policy: 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(nla: tb[TCA_SKBEDIT_PRIORITY]); |
150 | } |
151 | |
152 | if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { |
153 | if (is_tcf_skbedit_ingress(flags: 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(nla: tb[TCA_SKBEDIT_QUEUE_MAPPING]); |
160 | } |
161 | |
162 | if (tb[TCA_SKBEDIT_PTYPE] != NULL) { |
163 | ptype = nla_data(nla: tb[TCA_SKBEDIT_PTYPE]); |
164 | if (!skb_pkt_type_ok(ptype: *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(nla: tb[TCA_SKBEDIT_MARK]); |
172 | } |
173 | |
174 | if (tb[TCA_SKBEDIT_MASK] != NULL) { |
175 | flags |= SKBEDIT_F_MASK; |
176 | mask = nla_data(nla: tb[TCA_SKBEDIT_MASK]); |
177 | } |
178 | |
179 | if (tb[TCA_SKBEDIT_FLAGS] != NULL) { |
180 | u64 *pure_flags = nla_data(nla: 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(nla: 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(nla: tb[TCA_SKBEDIT_PARMS]); |
206 | index = parm->index; |
207 | err = tcf_idr_check_alloc(tn, index: &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: *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 | ops: &act_skbedit_ops, bind, cpustats: true, flags: 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: *a, bind); |
236 | return -EEXIST; |
237 | } |
238 | } |
239 | err = tcf_action_check_ctrlact(action: parm->action, tp, handle: &goto_ch, newchain: extack); |
240 | if (err < 0) |
241 | goto release_idr; |
242 | |
243 | params_new = kzalloc(size: 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(lock: &d->tcf_lock); |
266 | goto_ch = tcf_action_set_ctrlact(a: *a, action: parm->action, newchain: goto_ch); |
267 | params_new = rcu_replace_pointer(d->params, params_new, |
268 | lockdep_is_held(&d->tcf_lock)); |
269 | spin_unlock_bh(lock: &d->tcf_lock); |
270 | if (params_new) |
271 | kfree_rcu(params_new, rcu); |
272 | if (goto_ch) |
273 | tcf_chain_put_by_act(chain: goto_ch); |
274 | |
275 | return ret; |
276 | put_chain: |
277 | if (goto_ch) |
278 | tcf_chain_put_by_act(chain: goto_ch); |
279 | release_idr: |
280 | tcf_idr_release(a: *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(r: &d->tcf_refcnt) - ref, |
293 | .bindcnt = atomic_read(v: &d->tcf_bindcnt) - bind, |
294 | }; |
295 | u64 pure_flags = 0; |
296 | struct tcf_t t; |
297 | |
298 | spin_lock_bh(lock: &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, attrtype: TCA_SKBEDIT_PARMS, attrlen: sizeof(opt), data: &opt)) |
304 | goto nla_put_failure; |
305 | if ((params->flags & SKBEDIT_F_PRIORITY) && |
306 | nla_put_u32(skb, attrtype: TCA_SKBEDIT_PRIORITY, value: params->priority)) |
307 | goto nla_put_failure; |
308 | if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) && |
309 | nla_put_u16(skb, attrtype: TCA_SKBEDIT_QUEUE_MAPPING, value: params->queue_mapping)) |
310 | goto nla_put_failure; |
311 | if ((params->flags & SKBEDIT_F_MARK) && |
312 | nla_put_u32(skb, attrtype: TCA_SKBEDIT_MARK, value: params->mark)) |
313 | goto nla_put_failure; |
314 | if ((params->flags & SKBEDIT_F_PTYPE) && |
315 | nla_put_u16(skb, attrtype: TCA_SKBEDIT_PTYPE, value: params->ptype)) |
316 | goto nla_put_failure; |
317 | if ((params->flags & SKBEDIT_F_MASK) && |
318 | nla_put_u32(skb, attrtype: TCA_SKBEDIT_MASK, value: 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, attrtype: TCA_SKBEDIT_QUEUE_MAPPING_MAX, |
324 | value: 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, attrtype: TCA_SKBEDIT_FLAGS, attrlen: sizeof(pure_flags), data: &pure_flags)) |
331 | goto nla_put_failure; |
332 | |
333 | tcf_tm_dump(dtm: &t, stm: &d->tcf_tm); |
334 | if (nla_put_64bit(skb, attrtype: TCA_SKBEDIT_TM, attrlen: sizeof(t), data: &t, padattr: TCA_SKBEDIT_PAD)) |
335 | goto nla_put_failure; |
336 | spin_unlock_bh(lock: &d->tcf_lock); |
337 | |
338 | return skb->len; |
339 | |
340 | nla_put_failure: |
341 | spin_unlock_bh(lock: &d->tcf_lock); |
342 | nlmsg_trim(skb, mark: 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(payload: sizeof(struct tc_skbedit)) |
359 | + nla_total_size(payload: sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */ |
360 | + nla_total_size(payload: sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */ |
361 | + nla_total_size(payload: sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING_MAX */ |
362 | + nla_total_size(payload: sizeof(u32)) /* TCA_SKBEDIT_MARK */ |
363 | + nla_total_size(payload: sizeof(u16)) /* TCA_SKBEDIT_PTYPE */ |
364 | + nla_total_size(payload: sizeof(u32)) /* TCA_SKBEDIT_MASK */ |
365 | + nla_total_size_64bit(payload: 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(a: act)) { |
376 | entry->id = FLOW_ACTION_MARK; |
377 | entry->mark = tcf_skbedit_mark(a: act); |
378 | } else if (is_tcf_skbedit_ptype(a: act)) { |
379 | entry->id = FLOW_ACTION_PTYPE; |
380 | entry->ptype = tcf_skbedit_ptype(a: act); |
381 | } else if (is_tcf_skbedit_priority(a: act)) { |
382 | entry->id = FLOW_ACTION_PRIORITY; |
383 | entry->priority = tcf_skbedit_priority(a: act); |
384 | } else if (is_tcf_skbedit_tx_queue_mapping(a: 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(a: act)) { |
388 | entry->id = FLOW_ACTION_RX_QUEUE_MAPPING; |
389 | entry->rx_queue = tcf_skbedit_rx_queue_mapping(a: act); |
390 | } else if (is_tcf_skbedit_inheritdsfield(a: 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(a: act)) |
402 | fl_action->id = FLOW_ACTION_MARK; |
403 | else if (is_tcf_skbedit_ptype(a: act)) |
404 | fl_action->id = FLOW_ACTION_PTYPE; |
405 | else if (is_tcf_skbedit_priority(a: act)) |
406 | fl_action->id = FLOW_ACTION_PRIORITY; |
407 | else if (is_tcf_skbedit_rx_queue_mapping(a: 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, id: act_skbedit_ops.net_id); |
433 | |
434 | return tc_action_net_init(net, tn, ops: &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, id: 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(a: &act_skbedit_ops, ops: &skbedit_net_ops); |
456 | } |
457 | |
458 | static void __exit skbedit_cleanup_module(void) |
459 | { |
460 | tcf_unregister_action(a: &act_skbedit_ops, ops: &skbedit_net_ops); |
461 | } |
462 | |
463 | module_init(skbedit_init_module); |
464 | module_exit(skbedit_cleanup_module); |
465 | |