1 #ifndef _NET_FLOW_OFFLOAD_H
2 #define _NET_FLOW_OFFLOAD_H
3
4 #include <linux/kernel.h>
5 #include <linux/list.h>
6 #include <linux/netlink.h>
7 #include <net/flow_dissector.h>
8
9 struct flow_match {
10 struct flow_dissector *dissector;
11 void *mask;
12 void *key;
13 };
14
15 struct flow_match_meta {
16 struct flow_dissector_key_meta *key, *mask;
17 };
18
19 struct flow_match_basic {
20 struct flow_dissector_key_basic *key, *mask;
21 };
22
23 struct flow_match_control {
24 struct flow_dissector_key_control *key, *mask;
25 };
26
27 struct flow_match_eth_addrs {
28 struct flow_dissector_key_eth_addrs *key, *mask;
29 };
30
31 struct flow_match_vlan {
32 struct flow_dissector_key_vlan *key, *mask;
33 };
34
35 struct flow_match_ipv4_addrs {
36 struct flow_dissector_key_ipv4_addrs *key, *mask;
37 };
38
39 struct flow_match_ipv6_addrs {
40 struct flow_dissector_key_ipv6_addrs *key, *mask;
41 };
42
43 struct flow_match_ip {
44 struct flow_dissector_key_ip *key, *mask;
45 };
46
47 struct flow_match_ports {
48 struct flow_dissector_key_ports *key, *mask;
49 };
50
51 struct flow_match_icmp {
52 struct flow_dissector_key_icmp *key, *mask;
53 };
54
55 struct flow_match_tcp {
56 struct flow_dissector_key_tcp *key, *mask;
57 };
58
59 struct flow_match_mpls {
60 struct flow_dissector_key_mpls *key, *mask;
61 };
62
63 struct flow_match_enc_keyid {
64 struct flow_dissector_key_keyid *key, *mask;
65 };
66
67 struct flow_match_enc_opts {
68 struct flow_dissector_key_enc_opts *key, *mask;
69 };
70
71 struct flow_match_ct {
72 struct flow_dissector_key_ct *key, *mask;
73 };
74
75 struct flow_rule;
76
77 void flow_rule_match_meta(const struct flow_rule *rule,
78 struct flow_match_meta *out);
79 void flow_rule_match_basic(const struct flow_rule *rule,
80 struct flow_match_basic *out);
81 void flow_rule_match_control(const struct flow_rule *rule,
82 struct flow_match_control *out);
83 void flow_rule_match_eth_addrs(const struct flow_rule *rule,
84 struct flow_match_eth_addrs *out);
85 void flow_rule_match_vlan(const struct flow_rule *rule,
86 struct flow_match_vlan *out);
87 void flow_rule_match_cvlan(const struct flow_rule *rule,
88 struct flow_match_vlan *out);
89 void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
90 struct flow_match_ipv4_addrs *out);
91 void flow_rule_match_ipv6_addrs(const struct flow_rule *rule,
92 struct flow_match_ipv6_addrs *out);
93 void flow_rule_match_ip(const struct flow_rule *rule,
94 struct flow_match_ip *out);
95 void flow_rule_match_ports(const struct flow_rule *rule,
96 struct flow_match_ports *out);
97 void flow_rule_match_tcp(const struct flow_rule *rule,
98 struct flow_match_tcp *out);
99 void flow_rule_match_icmp(const struct flow_rule *rule,
100 struct flow_match_icmp *out);
101 void flow_rule_match_mpls(const struct flow_rule *rule,
102 struct flow_match_mpls *out);
103 void flow_rule_match_enc_control(const struct flow_rule *rule,
104 struct flow_match_control *out);
105 void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule,
106 struct flow_match_ipv4_addrs *out);
107 void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule,
108 struct flow_match_ipv6_addrs *out);
109 void flow_rule_match_enc_ip(const struct flow_rule *rule,
110 struct flow_match_ip *out);
111 void flow_rule_match_enc_ports(const struct flow_rule *rule,
112 struct flow_match_ports *out);
113 void flow_rule_match_enc_keyid(const struct flow_rule *rule,
114 struct flow_match_enc_keyid *out);
115 void flow_rule_match_enc_opts(const struct flow_rule *rule,
116 struct flow_match_enc_opts *out);
117 void flow_rule_match_ct(const struct flow_rule *rule,
118 struct flow_match_ct *out);
119
120 enum flow_action_id {
121 FLOW_ACTION_ACCEPT = 0,
122 FLOW_ACTION_DROP,
123 FLOW_ACTION_TRAP,
124 FLOW_ACTION_GOTO,
125 FLOW_ACTION_REDIRECT,
126 FLOW_ACTION_MIRRED,
127 FLOW_ACTION_REDIRECT_INGRESS,
128 FLOW_ACTION_MIRRED_INGRESS,
129 FLOW_ACTION_VLAN_PUSH,
130 FLOW_ACTION_VLAN_POP,
131 FLOW_ACTION_VLAN_MANGLE,
132 FLOW_ACTION_TUNNEL_ENCAP,
133 FLOW_ACTION_TUNNEL_DECAP,
134 FLOW_ACTION_MANGLE,
135 FLOW_ACTION_ADD,
136 FLOW_ACTION_CSUM,
137 FLOW_ACTION_MARK,
138 FLOW_ACTION_PTYPE,
139 FLOW_ACTION_PRIORITY,
140 FLOW_ACTION_WAKE,
141 FLOW_ACTION_QUEUE,
142 FLOW_ACTION_SAMPLE,
143 FLOW_ACTION_POLICE,
144 FLOW_ACTION_CT,
145 FLOW_ACTION_CT_METADATA,
146 FLOW_ACTION_MPLS_PUSH,
147 FLOW_ACTION_MPLS_POP,
148 FLOW_ACTION_MPLS_MANGLE,
149 FLOW_ACTION_GATE,
150 FLOW_ACTION_PPPOE_PUSH,
151 NUM_FLOW_ACTIONS,
152 };
153
154 /* This is mirroring enum pedit_header_type definition for easy mapping between
155 * tc pedit action. Legacy TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK is mapped to
156 * FLOW_ACT_MANGLE_UNSPEC, which is supported by no driver.
157 */
158 enum flow_action_mangle_base {
159 FLOW_ACT_MANGLE_UNSPEC = 0,
160 FLOW_ACT_MANGLE_HDR_TYPE_ETH,
161 FLOW_ACT_MANGLE_HDR_TYPE_IP4,
162 FLOW_ACT_MANGLE_HDR_TYPE_IP6,
163 FLOW_ACT_MANGLE_HDR_TYPE_TCP,
164 FLOW_ACT_MANGLE_HDR_TYPE_UDP,
165 };
166
167 enum flow_action_hw_stats_bit {
168 FLOW_ACTION_HW_STATS_IMMEDIATE_BIT,
169 FLOW_ACTION_HW_STATS_DELAYED_BIT,
170 FLOW_ACTION_HW_STATS_DISABLED_BIT,
171
172 FLOW_ACTION_HW_STATS_NUM_BITS
173 };
174
175 enum flow_action_hw_stats {
176 FLOW_ACTION_HW_STATS_IMMEDIATE =
177 BIT(FLOW_ACTION_HW_STATS_IMMEDIATE_BIT),
178 FLOW_ACTION_HW_STATS_DELAYED = BIT(FLOW_ACTION_HW_STATS_DELAYED_BIT),
179 FLOW_ACTION_HW_STATS_ANY = FLOW_ACTION_HW_STATS_IMMEDIATE |
180 FLOW_ACTION_HW_STATS_DELAYED,
181 FLOW_ACTION_HW_STATS_DISABLED =
182 BIT(FLOW_ACTION_HW_STATS_DISABLED_BIT),
183 FLOW_ACTION_HW_STATS_DONT_CARE = BIT(FLOW_ACTION_HW_STATS_NUM_BITS) - 1,
184 };
185
186 typedef void (*action_destr)(void *priv);
187
188 struct flow_action_cookie {
189 u32 cookie_len;
190 u8 cookie[];
191 };
192
193 struct flow_action_cookie *flow_action_cookie_create(void *data,
194 unsigned int len,
195 gfp_t gfp);
196 void flow_action_cookie_destroy(struct flow_action_cookie *cookie);
197
198 struct flow_action_entry {
199 enum flow_action_id id;
200 enum flow_action_hw_stats hw_stats;
201 action_destr destructor;
202 void *destructor_priv;
203 union {
204 u32 chain_index; /* FLOW_ACTION_GOTO */
205 struct net_device *dev; /* FLOW_ACTION_REDIRECT */
206 struct { /* FLOW_ACTION_VLAN */
207 u16 vid;
208 __be16 proto;
209 u8 prio;
210 } vlan;
211 struct { /* FLOW_ACTION_MANGLE */
212 /* FLOW_ACTION_ADD */
213 enum flow_action_mangle_base htype;
214 u32 offset;
215 u32 mask;
216 u32 val;
217 } mangle;
218 struct ip_tunnel_info *tunnel; /* FLOW_ACTION_TUNNEL_ENCAP */
219 u32 csum_flags; /* FLOW_ACTION_CSUM */
220 u32 mark; /* FLOW_ACTION_MARK */
221 u16 ptype; /* FLOW_ACTION_PTYPE */
222 u32 priority; /* FLOW_ACTION_PRIORITY */
223 struct { /* FLOW_ACTION_QUEUE */
224 u32 ctx;
225 u32 index;
226 u8 vf;
227 } queue;
228 struct { /* FLOW_ACTION_SAMPLE */
229 struct psample_group *psample_group;
230 u32 rate;
231 u32 trunc_size;
232 bool truncate;
233 } sample;
234 struct { /* FLOW_ACTION_POLICE */
235 u32 index;
236 u32 burst;
237 u64 rate_bytes_ps;
238 u64 burst_pkt;
239 u64 rate_pkt_ps;
240 u32 mtu;
241 } police;
242 struct { /* FLOW_ACTION_CT */
243 int action;
244 u16 zone;
245 struct nf_flowtable *flow_table;
246 } ct;
247 struct {
248 unsigned long cookie;
249 u32 mark;
250 u32 labels[4];
251 bool orig_dir;
252 } ct_metadata;
253 struct { /* FLOW_ACTION_MPLS_PUSH */
254 u32 label;
255 __be16 proto;
256 u8 tc;
257 u8 bos;
258 u8 ttl;
259 } mpls_push;
260 struct { /* FLOW_ACTION_MPLS_POP */
261 __be16 proto;
262 } mpls_pop;
263 struct { /* FLOW_ACTION_MPLS_MANGLE */
264 u32 label;
265 u8 tc;
266 u8 bos;
267 u8 ttl;
268 } mpls_mangle;
269 struct {
270 u32 index;
271 s32 prio;
272 u64 basetime;
273 u64 cycletime;
274 u64 cycletimeext;
275 u32 num_entries;
276 struct action_gate_entry *entries;
277 } gate;
278 struct { /* FLOW_ACTION_PPPOE_PUSH */
279 u16 sid;
280 } pppoe;
281 };
282 struct flow_action_cookie *cookie; /* user defined action cookie */
283 };
284
285 struct flow_action {
286 unsigned int num_entries;
287 struct flow_action_entry entries[];
288 };
289
flow_action_has_entries(const struct flow_action * action)290 static inline bool flow_action_has_entries(const struct flow_action *action)
291 {
292 return action->num_entries;
293 }
294
295 /**
296 * flow_offload_has_one_action() - check if exactly one action is present
297 * @action: tc filter flow offload action
298 *
299 * Returns true if exactly one action is present.
300 */
flow_offload_has_one_action(const struct flow_action * action)301 static inline bool flow_offload_has_one_action(const struct flow_action *action)
302 {
303 return action->num_entries == 1;
304 }
305
306 #define flow_action_for_each(__i, __act, __actions) \
307 for (__i = 0, __act = &(__actions)->entries[0]; \
308 __i < (__actions)->num_entries; \
309 __act = &(__actions)->entries[++__i])
310
311 static inline bool
flow_action_mixed_hw_stats_check(const struct flow_action * action,struct netlink_ext_ack * extack)312 flow_action_mixed_hw_stats_check(const struct flow_action *action,
313 struct netlink_ext_ack *extack)
314 {
315 const struct flow_action_entry *action_entry;
316 u8 last_hw_stats;
317 int i;
318
319 if (flow_offload_has_one_action(action))
320 return true;
321
322 flow_action_for_each(i, action_entry, action) {
323 if (i && action_entry->hw_stats != last_hw_stats) {
324 NL_SET_ERR_MSG_MOD(extack, "Mixing HW stats types for actions is not supported");
325 return false;
326 }
327 last_hw_stats = action_entry->hw_stats;
328 }
329 return true;
330 }
331
332 static inline const struct flow_action_entry *
flow_action_first_entry_get(const struct flow_action * action)333 flow_action_first_entry_get(const struct flow_action *action)
334 {
335 WARN_ON(!flow_action_has_entries(action));
336 return &action->entries[0];
337 }
338
339 static inline bool
__flow_action_hw_stats_check(const struct flow_action * action,struct netlink_ext_ack * extack,bool check_allow_bit,enum flow_action_hw_stats_bit allow_bit)340 __flow_action_hw_stats_check(const struct flow_action *action,
341 struct netlink_ext_ack *extack,
342 bool check_allow_bit,
343 enum flow_action_hw_stats_bit allow_bit)
344 {
345 const struct flow_action_entry *action_entry;
346
347 if (!flow_action_has_entries(action))
348 return true;
349 if (!flow_action_mixed_hw_stats_check(action, extack))
350 return false;
351
352 action_entry = flow_action_first_entry_get(action);
353
354 /* Zero is not a legal value for hw_stats, catch anyone passing it */
355 WARN_ON_ONCE(!action_entry->hw_stats);
356
357 if (!check_allow_bit &&
358 ~action_entry->hw_stats & FLOW_ACTION_HW_STATS_ANY) {
359 NL_SET_ERR_MSG_MOD(extack, "Driver supports only default HW stats type \"any\"");
360 return false;
361 } else if (check_allow_bit &&
362 !(action_entry->hw_stats & BIT(allow_bit))) {
363 NL_SET_ERR_MSG_MOD(extack, "Driver does not support selected HW stats type");
364 return false;
365 }
366 return true;
367 }
368
369 static inline bool
flow_action_hw_stats_check(const struct flow_action * action,struct netlink_ext_ack * extack,enum flow_action_hw_stats_bit allow_bit)370 flow_action_hw_stats_check(const struct flow_action *action,
371 struct netlink_ext_ack *extack,
372 enum flow_action_hw_stats_bit allow_bit)
373 {
374 return __flow_action_hw_stats_check(action, extack, true, allow_bit);
375 }
376
377 static inline bool
flow_action_basic_hw_stats_check(const struct flow_action * action,struct netlink_ext_ack * extack)378 flow_action_basic_hw_stats_check(const struct flow_action *action,
379 struct netlink_ext_ack *extack)
380 {
381 return __flow_action_hw_stats_check(action, extack, false, 0);
382 }
383
384 struct flow_rule {
385 struct flow_match match;
386 struct flow_action action;
387 };
388
389 struct flow_rule *flow_rule_alloc(unsigned int num_actions);
390
flow_rule_match_key(const struct flow_rule * rule,enum flow_dissector_key_id key)391 static inline bool flow_rule_match_key(const struct flow_rule *rule,
392 enum flow_dissector_key_id key)
393 {
394 return dissector_uses_key(rule->match.dissector, key);
395 }
396
397 struct flow_stats {
398 u64 pkts;
399 u64 bytes;
400 u64 drops;
401 u64 lastused;
402 enum flow_action_hw_stats used_hw_stats;
403 bool used_hw_stats_valid;
404 };
405
flow_stats_update(struct flow_stats * flow_stats,u64 bytes,u64 pkts,u64 drops,u64 lastused,enum flow_action_hw_stats used_hw_stats)406 static inline void flow_stats_update(struct flow_stats *flow_stats,
407 u64 bytes, u64 pkts,
408 u64 drops, u64 lastused,
409 enum flow_action_hw_stats used_hw_stats)
410 {
411 flow_stats->pkts += pkts;
412 flow_stats->bytes += bytes;
413 flow_stats->drops += drops;
414 flow_stats->lastused = max_t(u64, flow_stats->lastused, lastused);
415
416 /* The driver should pass value with a maximum of one bit set.
417 * Passing FLOW_ACTION_HW_STATS_ANY is invalid.
418 */
419 WARN_ON(used_hw_stats == FLOW_ACTION_HW_STATS_ANY);
420 flow_stats->used_hw_stats |= used_hw_stats;
421 flow_stats->used_hw_stats_valid = true;
422 }
423
424 enum flow_block_command {
425 FLOW_BLOCK_BIND,
426 FLOW_BLOCK_UNBIND,
427 };
428
429 enum flow_block_binder_type {
430 FLOW_BLOCK_BINDER_TYPE_UNSPEC,
431 FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
432 FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS,
433 FLOW_BLOCK_BINDER_TYPE_RED_EARLY_DROP,
434 FLOW_BLOCK_BINDER_TYPE_RED_MARK,
435 };
436
437 struct flow_block {
438 struct list_head cb_list;
439 };
440
441 struct netlink_ext_ack;
442
443 struct flow_block_offload {
444 enum flow_block_command command;
445 enum flow_block_binder_type binder_type;
446 bool block_shared;
447 bool unlocked_driver_cb;
448 struct net *net;
449 struct flow_block *block;
450 struct list_head cb_list;
451 struct list_head *driver_block_list;
452 struct netlink_ext_ack *extack;
453 struct Qdisc *sch;
454 struct list_head *cb_list_head;
455 };
456
457 enum tc_setup_type;
458 typedef int flow_setup_cb_t(enum tc_setup_type type, void *type_data,
459 void *cb_priv);
460
461 struct flow_block_cb;
462
463 struct flow_block_indr {
464 struct list_head list;
465 struct net_device *dev;
466 struct Qdisc *sch;
467 enum flow_block_binder_type binder_type;
468 void *data;
469 void *cb_priv;
470 void (*cleanup)(struct flow_block_cb *block_cb);
471 };
472
473 struct flow_block_cb {
474 struct list_head driver_list;
475 struct list_head list;
476 flow_setup_cb_t *cb;
477 void *cb_ident;
478 void *cb_priv;
479 void (*release)(void *cb_priv);
480 struct flow_block_indr indr;
481 unsigned int refcnt;
482 };
483
484 struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
485 void *cb_ident, void *cb_priv,
486 void (*release)(void *cb_priv));
487 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
488 void *cb_ident, void *cb_priv,
489 void (*release)(void *cb_priv),
490 struct flow_block_offload *bo,
491 struct net_device *dev,
492 struct Qdisc *sch, void *data,
493 void *indr_cb_priv,
494 void (*cleanup)(struct flow_block_cb *block_cb));
495 void flow_block_cb_free(struct flow_block_cb *block_cb);
496
497 struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
498 flow_setup_cb_t *cb, void *cb_ident);
499
500 void *flow_block_cb_priv(struct flow_block_cb *block_cb);
501 void flow_block_cb_incref(struct flow_block_cb *block_cb);
502 unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb);
503
flow_block_cb_add(struct flow_block_cb * block_cb,struct flow_block_offload * offload)504 static inline void flow_block_cb_add(struct flow_block_cb *block_cb,
505 struct flow_block_offload *offload)
506 {
507 list_add_tail(&block_cb->list, &offload->cb_list);
508 }
509
flow_block_cb_remove(struct flow_block_cb * block_cb,struct flow_block_offload * offload)510 static inline void flow_block_cb_remove(struct flow_block_cb *block_cb,
511 struct flow_block_offload *offload)
512 {
513 list_move(&block_cb->list, &offload->cb_list);
514 }
515
flow_indr_block_cb_remove(struct flow_block_cb * block_cb,struct flow_block_offload * offload)516 static inline void flow_indr_block_cb_remove(struct flow_block_cb *block_cb,
517 struct flow_block_offload *offload)
518 {
519 list_del(&block_cb->indr.list);
520 list_move(&block_cb->list, &offload->cb_list);
521 }
522
523 bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
524 struct list_head *driver_block_list);
525
526 int flow_block_cb_setup_simple(struct flow_block_offload *f,
527 struct list_head *driver_list,
528 flow_setup_cb_t *cb,
529 void *cb_ident, void *cb_priv, bool ingress_only);
530
531 enum flow_cls_command {
532 FLOW_CLS_REPLACE,
533 FLOW_CLS_DESTROY,
534 FLOW_CLS_STATS,
535 FLOW_CLS_TMPLT_CREATE,
536 FLOW_CLS_TMPLT_DESTROY,
537 };
538
539 struct flow_cls_common_offload {
540 u32 chain_index;
541 __be16 protocol;
542 u32 prio;
543 struct netlink_ext_ack *extack;
544 };
545
546 struct flow_cls_offload {
547 struct flow_cls_common_offload common;
548 enum flow_cls_command command;
549 unsigned long cookie;
550 struct flow_rule *rule;
551 struct flow_stats stats;
552 u32 classid;
553 };
554
555 static inline struct flow_rule *
flow_cls_offload_flow_rule(struct flow_cls_offload * flow_cmd)556 flow_cls_offload_flow_rule(struct flow_cls_offload *flow_cmd)
557 {
558 return flow_cmd->rule;
559 }
560
flow_block_init(struct flow_block * flow_block)561 static inline void flow_block_init(struct flow_block *flow_block)
562 {
563 INIT_LIST_HEAD(&flow_block->cb_list);
564 }
565
566 typedef int flow_indr_block_bind_cb_t(struct net_device *dev, struct Qdisc *sch, void *cb_priv,
567 enum tc_setup_type type, void *type_data,
568 void *data,
569 void (*cleanup)(struct flow_block_cb *block_cb));
570
571 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv);
572 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
573 void (*release)(void *cb_priv));
574 int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
575 enum tc_setup_type type, void *data,
576 struct flow_block_offload *bo,
577 void (*cleanup)(struct flow_block_cb *block_cb));
578 bool flow_indr_dev_exists(void);
579
580 #endif /* _NET_FLOW_OFFLOAD_H */
581