1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright 2011-2014 Autronica Fire and Security AS
3 *
4 * Author(s):
5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
6 *
7 * Frame router for HSR and PRP.
8 */
9
10 #include "hsr_forward.h"
11 #include <linux/types.h>
12 #include <linux/skbuff.h>
13 #include <linux/etherdevice.h>
14 #include <linux/if_vlan.h>
15 #include "hsr_main.h"
16 #include "hsr_framereg.h"
17
18 struct hsr_node;
19
20 /* The uses I can see for these HSR supervision frames are:
21 * 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
22 * 22") to reset any sequence_nr counters belonging to that node. Useful if
23 * the other node's counter has been reset for some reason.
24 * --
25 * Or not - resetting the counter and bridging the frame would create a
26 * loop, unfortunately.
27 *
28 * 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
29 * frame is received from a particular node, we know something is wrong.
30 * We just register these (as with normal frames) and throw them away.
31 *
32 * 3) Allow different MAC addresses for the two slave interfaces, using the
33 * MacAddressA field.
34 */
is_supervision_frame(struct hsr_priv * hsr,struct sk_buff * skb)35 static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
36 {
37 struct ethhdr *eth_hdr;
38 struct hsr_sup_tag *hsr_sup_tag;
39 struct hsrv1_ethhdr_sp *hsr_V1_hdr;
40 struct hsr_sup_tlv *hsr_sup_tlv;
41 u16 total_length = 0;
42
43 WARN_ON_ONCE(!skb_mac_header_was_set(skb));
44 eth_hdr = (struct ethhdr *)skb_mac_header(skb);
45
46 /* Correct addr? */
47 if (!ether_addr_equal(eth_hdr->h_dest,
48 hsr->sup_multicast_addr))
49 return false;
50
51 /* Correct ether type?. */
52 if (!(eth_hdr->h_proto == htons(ETH_P_PRP) ||
53 eth_hdr->h_proto == htons(ETH_P_HSR)))
54 return false;
55
56 /* Get the supervision header from correct location. */
57 if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
58 total_length = sizeof(struct hsrv1_ethhdr_sp);
59 if (!pskb_may_pull(skb, total_length))
60 return false;
61
62 hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb);
63 if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP))
64 return false;
65
66 hsr_sup_tag = &hsr_V1_hdr->hsr_sup;
67 } else {
68 total_length = sizeof(struct hsrv0_ethhdr_sp);
69 if (!pskb_may_pull(skb, total_length))
70 return false;
71
72 hsr_sup_tag =
73 &((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup;
74 }
75
76 if (hsr_sup_tag->tlv.HSR_TLV_type != HSR_TLV_ANNOUNCE &&
77 hsr_sup_tag->tlv.HSR_TLV_type != HSR_TLV_LIFE_CHECK &&
78 hsr_sup_tag->tlv.HSR_TLV_type != PRP_TLV_LIFE_CHECK_DD &&
79 hsr_sup_tag->tlv.HSR_TLV_type != PRP_TLV_LIFE_CHECK_DA)
80 return false;
81 if (hsr_sup_tag->tlv.HSR_TLV_length != 12 &&
82 hsr_sup_tag->tlv.HSR_TLV_length != sizeof(struct hsr_sup_payload))
83 return false;
84
85 /* Get next tlv */
86 total_length += hsr_sup_tag->tlv.HSR_TLV_length;
87 if (!pskb_may_pull(skb, total_length))
88 return false;
89 skb_pull(skb, total_length);
90 hsr_sup_tlv = (struct hsr_sup_tlv *)skb->data;
91 skb_push(skb, total_length);
92
93 /* if this is a redbox supervision frame we need to verify
94 * that more data is available
95 */
96 if (hsr_sup_tlv->HSR_TLV_type == PRP_TLV_REDBOX_MAC) {
97 /* tlv length must be a length of a mac address */
98 if (hsr_sup_tlv->HSR_TLV_length != sizeof(struct hsr_sup_payload))
99 return false;
100
101 /* make sure another tlv follows */
102 total_length += sizeof(struct hsr_sup_tlv) + hsr_sup_tlv->HSR_TLV_length;
103 if (!pskb_may_pull(skb, total_length))
104 return false;
105
106 /* get next tlv */
107 skb_pull(skb, total_length);
108 hsr_sup_tlv = (struct hsr_sup_tlv *)skb->data;
109 skb_push(skb, total_length);
110 }
111
112 /* end of tlvs must follow at the end */
113 if (hsr_sup_tlv->HSR_TLV_type == HSR_TLV_EOT &&
114 hsr_sup_tlv->HSR_TLV_length != 0)
115 return false;
116
117 return true;
118 }
119
is_proxy_supervision_frame(struct hsr_priv * hsr,struct sk_buff * skb)120 static bool is_proxy_supervision_frame(struct hsr_priv *hsr,
121 struct sk_buff *skb)
122 {
123 struct hsr_sup_payload *payload;
124 struct ethhdr *eth_hdr;
125 u16 total_length = 0;
126
127 eth_hdr = (struct ethhdr *)skb_mac_header(skb);
128
129 /* Get the HSR protocol revision. */
130 if (eth_hdr->h_proto == htons(ETH_P_HSR))
131 total_length = sizeof(struct hsrv1_ethhdr_sp);
132 else
133 total_length = sizeof(struct hsrv0_ethhdr_sp);
134
135 if (!pskb_may_pull(skb, total_length + sizeof(struct hsr_sup_payload)))
136 return false;
137
138 skb_pull(skb, total_length);
139 payload = (struct hsr_sup_payload *)skb->data;
140 skb_push(skb, total_length);
141
142 /* For RedBox (HSR-SAN) check if we have received the supervision
143 * frame with MAC addresses from own ProxyNodeTable.
144 */
145 return hsr_is_node_in_db(&hsr->proxy_node_db,
146 payload->macaddress_A);
147 }
148
create_stripped_skb_hsr(struct sk_buff * skb_in,struct hsr_frame_info * frame)149 static struct sk_buff *create_stripped_skb_hsr(struct sk_buff *skb_in,
150 struct hsr_frame_info *frame)
151 {
152 struct sk_buff *skb;
153 int copylen;
154 unsigned char *dst, *src;
155
156 skb_pull(skb_in, HSR_HLEN);
157 skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC);
158 skb_push(skb_in, HSR_HLEN);
159 if (!skb)
160 return NULL;
161
162 skb_reset_mac_header(skb);
163
164 if (skb->ip_summed == CHECKSUM_PARTIAL)
165 skb->csum_start -= HSR_HLEN;
166
167 copylen = 2 * ETH_ALEN;
168 if (frame->is_vlan)
169 copylen += VLAN_HLEN;
170 src = skb_mac_header(skb_in);
171 dst = skb_mac_header(skb);
172 memcpy(dst, src, copylen);
173
174 skb->protocol = eth_hdr(skb)->h_proto;
175 return skb;
176 }
177
hsr_get_untagged_frame(struct hsr_frame_info * frame,struct hsr_port * port)178 struct sk_buff *hsr_get_untagged_frame(struct hsr_frame_info *frame,
179 struct hsr_port *port)
180 {
181 if (!frame->skb_std) {
182 if (frame->skb_hsr)
183 frame->skb_std =
184 create_stripped_skb_hsr(frame->skb_hsr, frame);
185 else
186 netdev_warn_once(port->dev,
187 "Unexpected frame received in hsr_get_untagged_frame()\n");
188
189 if (!frame->skb_std)
190 return NULL;
191 }
192
193 return skb_clone(frame->skb_std, GFP_ATOMIC);
194 }
195
prp_get_untagged_frame(struct hsr_frame_info * frame,struct hsr_port * port)196 struct sk_buff *prp_get_untagged_frame(struct hsr_frame_info *frame,
197 struct hsr_port *port)
198 {
199 if (!frame->skb_std) {
200 if (frame->skb_prp) {
201 /* trim the skb by len - HSR_HLEN to exclude RCT */
202 skb_trim(frame->skb_prp,
203 frame->skb_prp->len - HSR_HLEN);
204 frame->skb_std =
205 __pskb_copy(frame->skb_prp,
206 skb_headroom(frame->skb_prp),
207 GFP_ATOMIC);
208 } else {
209 /* Unexpected */
210 WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n",
211 __FILE__, __LINE__, port->dev->name);
212 return NULL;
213 }
214 }
215
216 return skb_clone(frame->skb_std, GFP_ATOMIC);
217 }
218
prp_set_lan_id(struct prp_rct * trailer,struct hsr_port * port)219 static void prp_set_lan_id(struct prp_rct *trailer,
220 struct hsr_port *port)
221 {
222 int lane_id;
223
224 if (port->type == HSR_PT_SLAVE_A)
225 lane_id = 0;
226 else
227 lane_id = 1;
228
229 /* Add net_id in the upper 3 bits of lane_id */
230 lane_id |= port->hsr->net_id;
231 set_prp_lan_id(trailer, lane_id);
232 }
233
234 /* Tailroom for PRP rct should have been created before calling this */
prp_fill_rct(struct sk_buff * skb,struct hsr_frame_info * frame,struct hsr_port * port)235 static struct sk_buff *prp_fill_rct(struct sk_buff *skb,
236 struct hsr_frame_info *frame,
237 struct hsr_port *port)
238 {
239 struct prp_rct *trailer;
240 int min_size = ETH_ZLEN;
241 int lsdu_size;
242
243 if (!skb)
244 return skb;
245
246 if (frame->is_vlan)
247 min_size = VLAN_ETH_ZLEN;
248
249 if (skb_put_padto(skb, min_size))
250 return NULL;
251
252 trailer = (struct prp_rct *)skb_put(skb, HSR_HLEN);
253 lsdu_size = skb->len - 14;
254 if (frame->is_vlan)
255 lsdu_size -= 4;
256 prp_set_lan_id(trailer, port);
257 set_prp_LSDU_size(trailer, lsdu_size);
258 trailer->sequence_nr = htons(frame->sequence_nr);
259 trailer->PRP_suffix = htons(ETH_P_PRP);
260 skb->protocol = eth_hdr(skb)->h_proto;
261
262 return skb;
263 }
264
hsr_set_path_id(struct hsr_ethhdr * hsr_ethhdr,struct hsr_port * port)265 static void hsr_set_path_id(struct hsr_ethhdr *hsr_ethhdr,
266 struct hsr_port *port)
267 {
268 int path_id;
269
270 if (port->type == HSR_PT_SLAVE_A)
271 path_id = 0;
272 else
273 path_id = 1;
274
275 set_hsr_tag_path(&hsr_ethhdr->hsr_tag, path_id);
276 }
277
hsr_fill_tag(struct sk_buff * skb,struct hsr_frame_info * frame,struct hsr_port * port,u8 proto_version)278 static struct sk_buff *hsr_fill_tag(struct sk_buff *skb,
279 struct hsr_frame_info *frame,
280 struct hsr_port *port, u8 proto_version)
281 {
282 struct hsr_ethhdr *hsr_ethhdr;
283 unsigned char *pc;
284 int lsdu_size;
285
286 /* pad to minimum packet size which is 60 + 6 (HSR tag) */
287 if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
288 return NULL;
289
290 lsdu_size = skb->len - 14;
291 if (frame->is_vlan)
292 lsdu_size -= 4;
293
294 pc = skb_mac_header(skb);
295 if (frame->is_vlan)
296 /* This 4-byte shift (size of a vlan tag) does not
297 * mean that the ethhdr starts there. But rather it
298 * provides the proper environment for accessing
299 * the fields, such as hsr_tag etc., just like
300 * when the vlan tag is not there. This is because
301 * the hsr tag is after the vlan tag.
302 */
303 hsr_ethhdr = (struct hsr_ethhdr *)(pc + VLAN_HLEN);
304 else
305 hsr_ethhdr = (struct hsr_ethhdr *)pc;
306
307 hsr_set_path_id(hsr_ethhdr, port);
308 set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
309 hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
310 hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
311 hsr_ethhdr->ethhdr.h_proto = htons(proto_version ?
312 ETH_P_HSR : ETH_P_PRP);
313 skb->protocol = hsr_ethhdr->ethhdr.h_proto;
314
315 return skb;
316 }
317
318 /* If the original frame was an HSR tagged frame, just clone it to be sent
319 * unchanged. Otherwise, create a private frame especially tagged for 'port'.
320 */
hsr_create_tagged_frame(struct hsr_frame_info * frame,struct hsr_port * port)321 struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame,
322 struct hsr_port *port)
323 {
324 unsigned char *dst, *src;
325 struct sk_buff *skb;
326 int movelen;
327
328 if (frame->skb_hsr) {
329 struct hsr_ethhdr *hsr_ethhdr =
330 (struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr);
331
332 /* set the lane id properly */
333 hsr_set_path_id(hsr_ethhdr, port);
334 return skb_clone(frame->skb_hsr, GFP_ATOMIC);
335 } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) {
336 return skb_clone(frame->skb_std, GFP_ATOMIC);
337 }
338
339 /* Create the new skb with enough headroom to fit the HSR tag */
340 skb = __pskb_copy(frame->skb_std,
341 skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC);
342 if (!skb)
343 return NULL;
344 skb_reset_mac_header(skb);
345
346 if (skb->ip_summed == CHECKSUM_PARTIAL)
347 skb->csum_start += HSR_HLEN;
348
349 movelen = ETH_HLEN;
350 if (frame->is_vlan)
351 movelen += VLAN_HLEN;
352
353 src = skb_mac_header(skb);
354 dst = skb_push(skb, HSR_HLEN);
355 memmove(dst, src, movelen);
356 skb_reset_mac_header(skb);
357
358 /* skb_put_padto free skb on error and hsr_fill_tag returns NULL in
359 * that case
360 */
361 return hsr_fill_tag(skb, frame, port, port->hsr->prot_version);
362 }
363
prp_create_tagged_frame(struct hsr_frame_info * frame,struct hsr_port * port)364 struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame,
365 struct hsr_port *port)
366 {
367 struct sk_buff *skb;
368
369 if (frame->skb_prp) {
370 struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp);
371
372 if (trailer) {
373 prp_set_lan_id(trailer, port);
374 } else {
375 WARN_ONCE(!trailer, "errored PRP skb");
376 return NULL;
377 }
378 return skb_clone(frame->skb_prp, GFP_ATOMIC);
379 } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) {
380 return skb_clone(frame->skb_std, GFP_ATOMIC);
381 }
382
383 skb = skb_copy_expand(frame->skb_std, skb_headroom(frame->skb_std),
384 skb_tailroom(frame->skb_std) + HSR_HLEN,
385 GFP_ATOMIC);
386 return prp_fill_rct(skb, frame, port);
387 }
388
hsr_deliver_master(struct sk_buff * skb,struct net_device * dev,struct hsr_node * node_src)389 static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev,
390 struct hsr_node *node_src)
391 {
392 bool was_multicast_frame;
393 int res, recv_len;
394
395 was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST);
396 hsr_addr_subst_source(node_src, skb);
397 skb_pull(skb, ETH_HLEN);
398 recv_len = skb->len;
399 res = netif_rx(skb);
400 if (res == NET_RX_DROP) {
401 dev->stats.rx_dropped++;
402 } else {
403 dev->stats.rx_packets++;
404 dev->stats.rx_bytes += recv_len;
405 if (was_multicast_frame)
406 dev->stats.multicast++;
407 }
408 }
409
hsr_xmit(struct sk_buff * skb,struct hsr_port * port,struct hsr_frame_info * frame)410 static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port,
411 struct hsr_frame_info *frame)
412 {
413 if (frame->port_rcv->type == HSR_PT_MASTER) {
414 hsr_addr_subst_dest(frame->node_src, skb, port);
415
416 /* Address substitution (IEC62439-3 pp 26, 50): replace mac
417 * address of outgoing frame with that of the outgoing slave's.
418 */
419 ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr);
420 }
421
422 /* When HSR node is used as RedBox - the frame received from HSR ring
423 * requires source MAC address (SA) replacement to one which can be
424 * recognized by SAN devices (otherwise, frames are dropped by switch)
425 */
426 if (port->type == HSR_PT_INTERLINK)
427 ether_addr_copy(eth_hdr(skb)->h_source,
428 port->hsr->macaddress_redbox);
429
430 return dev_queue_xmit(skb);
431 }
432
prp_drop_frame(struct hsr_frame_info * frame,struct hsr_port * port)433 bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)
434 {
435 return ((frame->port_rcv->type == HSR_PT_SLAVE_A &&
436 port->type == HSR_PT_SLAVE_B) ||
437 (frame->port_rcv->type == HSR_PT_SLAVE_B &&
438 port->type == HSR_PT_SLAVE_A));
439 }
440
hsr_drop_frame(struct hsr_frame_info * frame,struct hsr_port * port)441 bool hsr_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)
442 {
443 struct sk_buff *skb;
444
445 if (port->dev->features & NETIF_F_HW_HSR_FWD)
446 return prp_drop_frame(frame, port);
447
448 /* RedBox specific frames dropping policies
449 *
450 * Do not send HSR supervisory frames to SAN devices
451 */
452 if (frame->is_supervision && port->type == HSR_PT_INTERLINK)
453 return true;
454
455 /* Do not forward to other HSR port (A or B) unicast frames which
456 * are addressed to interlink port (and are in the ProxyNodeTable).
457 */
458 skb = frame->skb_hsr;
459 if (skb && prp_drop_frame(frame, port) &&
460 is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
461 hsr_is_node_in_db(&port->hsr->proxy_node_db,
462 eth_hdr(skb)->h_dest)) {
463 return true;
464 }
465
466 /* Do not forward to port C (Interlink) frames from nodes A and B
467 * if DA is in NodeTable.
468 */
469 if ((frame->port_rcv->type == HSR_PT_SLAVE_A ||
470 frame->port_rcv->type == HSR_PT_SLAVE_B) &&
471 port->type == HSR_PT_INTERLINK) {
472 skb = frame->skb_hsr;
473 if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
474 hsr_is_node_in_db(&port->hsr->node_db,
475 eth_hdr(skb)->h_dest)) {
476 return true;
477 }
478 }
479
480 /* Do not forward to port A and B unicast frames received on the
481 * interlink port if it is addressed to one of nodes registered in
482 * the ProxyNodeTable.
483 */
484 if ((port->type == HSR_PT_SLAVE_A || port->type == HSR_PT_SLAVE_B) &&
485 frame->port_rcv->type == HSR_PT_INTERLINK) {
486 skb = frame->skb_std;
487 if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
488 hsr_is_node_in_db(&port->hsr->proxy_node_db,
489 eth_hdr(skb)->h_dest)) {
490 return true;
491 }
492 }
493
494 return false;
495 }
496
497 /* Forward the frame through all devices except:
498 * - Back through the receiving device
499 * - If it's a HSR frame: through a device where it has passed before
500 * - if it's a PRP frame: through another PRP slave device (no bridge)
501 * - To the local HSR master only if the frame is directly addressed to it, or
502 * a non-supervision multicast or broadcast frame.
503 *
504 * HSR slave devices should insert a HSR tag into the frame, or forward the
505 * frame unchanged if it's already tagged. Interlink devices should strip HSR
506 * tags if they're of the non-HSR type (but only after duplicate discard). The
507 * master device always strips HSR tags.
508 */
hsr_forward_do(struct hsr_frame_info * frame)509 static void hsr_forward_do(struct hsr_frame_info *frame)
510 {
511 struct hsr_port *port;
512 struct sk_buff *skb;
513 bool sent = false;
514
515 hsr_for_each_port(frame->port_rcv->hsr, port) {
516 struct hsr_priv *hsr = port->hsr;
517 /* Don't send frame back the way it came */
518 if (port == frame->port_rcv)
519 continue;
520
521 /* Don't deliver locally unless we should */
522 if (port->type == HSR_PT_MASTER && !frame->is_local_dest)
523 continue;
524
525 /* Deliver frames directly addressed to us to master only */
526 if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)
527 continue;
528
529 /* If hardware duplicate generation is enabled, only send out
530 * one port.
531 */
532 if ((port->dev->features & NETIF_F_HW_HSR_DUP) && sent)
533 continue;
534
535 /* Don't send frame over port where it has been sent before.
536 * Also for SAN, this shouldn't be done.
537 */
538 if (!frame->is_from_san &&
539 hsr_register_frame_out(port, frame->node_src,
540 frame->sequence_nr))
541 continue;
542
543 if (frame->is_supervision && port->type == HSR_PT_MASTER &&
544 !frame->is_proxy_supervision) {
545 hsr_handle_sup_frame(frame);
546 continue;
547 }
548
549 /* Check if frame is to be dropped. Eg. for PRP no forward
550 * between ports, or sending HSR supervision to RedBox.
551 */
552 if (hsr->proto_ops->drop_frame &&
553 hsr->proto_ops->drop_frame(frame, port))
554 continue;
555
556 if (port->type == HSR_PT_SLAVE_A ||
557 port->type == HSR_PT_SLAVE_B)
558 skb = hsr->proto_ops->create_tagged_frame(frame, port);
559 else
560 skb = hsr->proto_ops->get_untagged_frame(frame, port);
561
562 if (!skb) {
563 frame->port_rcv->dev->stats.rx_dropped++;
564 continue;
565 }
566
567 skb->dev = port->dev;
568 if (port->type == HSR_PT_MASTER) {
569 hsr_deliver_master(skb, port->dev, frame->node_src);
570 } else {
571 if (!hsr_xmit(skb, port, frame))
572 if (port->type == HSR_PT_SLAVE_A ||
573 port->type == HSR_PT_SLAVE_B)
574 sent = true;
575 }
576 }
577 }
578
check_local_dest(struct hsr_priv * hsr,struct sk_buff * skb,struct hsr_frame_info * frame)579 static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb,
580 struct hsr_frame_info *frame)
581 {
582 if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) {
583 frame->is_local_exclusive = true;
584 skb->pkt_type = PACKET_HOST;
585 } else {
586 frame->is_local_exclusive = false;
587 }
588
589 if (skb->pkt_type == PACKET_HOST ||
590 skb->pkt_type == PACKET_MULTICAST ||
591 skb->pkt_type == PACKET_BROADCAST) {
592 frame->is_local_dest = true;
593 } else {
594 frame->is_local_dest = false;
595 }
596 }
597
handle_std_frame(struct sk_buff * skb,struct hsr_frame_info * frame)598 static void handle_std_frame(struct sk_buff *skb,
599 struct hsr_frame_info *frame)
600 {
601 struct hsr_port *port = frame->port_rcv;
602 struct hsr_priv *hsr = port->hsr;
603
604 frame->skb_hsr = NULL;
605 frame->skb_prp = NULL;
606 frame->skb_std = skb;
607
608 if (port->type != HSR_PT_MASTER)
609 frame->is_from_san = true;
610
611 if (port->type == HSR_PT_MASTER ||
612 port->type == HSR_PT_INTERLINK) {
613 /* Sequence nr for the master/interlink node */
614 lockdep_assert_held(&hsr->seqnr_lock);
615 frame->sequence_nr = hsr->sequence_nr;
616 hsr->sequence_nr++;
617 }
618 }
619
hsr_fill_frame_info(__be16 proto,struct sk_buff * skb,struct hsr_frame_info * frame)620 int hsr_fill_frame_info(__be16 proto, struct sk_buff *skb,
621 struct hsr_frame_info *frame)
622 {
623 struct hsr_port *port = frame->port_rcv;
624 struct hsr_priv *hsr = port->hsr;
625
626 /* HSRv0 supervisory frames double as a tag so treat them as tagged. */
627 if ((!hsr->prot_version && proto == htons(ETH_P_PRP)) ||
628 proto == htons(ETH_P_HSR)) {
629 /* Check if skb contains hsr_ethhdr */
630 if (skb->mac_len < sizeof(struct hsr_ethhdr))
631 return -EINVAL;
632
633 /* HSR tagged frame :- Data or Supervision */
634 frame->skb_std = NULL;
635 frame->skb_prp = NULL;
636 frame->skb_hsr = skb;
637 frame->sequence_nr = hsr_get_skb_sequence_nr(skb);
638 return 0;
639 }
640
641 /* Standard frame or PRP from master port */
642 handle_std_frame(skb, frame);
643
644 return 0;
645 }
646
prp_fill_frame_info(__be16 proto,struct sk_buff * skb,struct hsr_frame_info * frame)647 int prp_fill_frame_info(__be16 proto, struct sk_buff *skb,
648 struct hsr_frame_info *frame)
649 {
650 /* Supervision frame */
651 struct prp_rct *rct = skb_get_PRP_rct(skb);
652
653 if (rct &&
654 prp_check_lsdu_size(skb, rct, frame->is_supervision)) {
655 frame->skb_hsr = NULL;
656 frame->skb_std = NULL;
657 frame->skb_prp = skb;
658 frame->sequence_nr = prp_get_skb_sequence_nr(rct);
659 return 0;
660 }
661 handle_std_frame(skb, frame);
662
663 return 0;
664 }
665
fill_frame_info(struct hsr_frame_info * frame,struct sk_buff * skb,struct hsr_port * port)666 static int fill_frame_info(struct hsr_frame_info *frame,
667 struct sk_buff *skb, struct hsr_port *port)
668 {
669 struct hsr_priv *hsr = port->hsr;
670 struct hsr_vlan_ethhdr *vlan_hdr;
671 struct list_head *n_db;
672 struct ethhdr *ethhdr;
673 __be16 proto;
674 int ret;
675
676 /* Check if skb contains ethhdr */
677 if (skb->mac_len < sizeof(struct ethhdr))
678 return -EINVAL;
679
680 memset(frame, 0, sizeof(*frame));
681 frame->is_supervision = is_supervision_frame(port->hsr, skb);
682 if (frame->is_supervision && hsr->redbox)
683 frame->is_proxy_supervision =
684 is_proxy_supervision_frame(port->hsr, skb);
685
686 n_db = &hsr->node_db;
687 if (port->type == HSR_PT_INTERLINK)
688 n_db = &hsr->proxy_node_db;
689
690 frame->node_src = hsr_get_node(port, n_db, skb,
691 frame->is_supervision, port->type);
692 if (!frame->node_src)
693 return -1; /* Unknown node and !is_supervision, or no mem */
694
695 ethhdr = (struct ethhdr *)skb_mac_header(skb);
696 frame->is_vlan = false;
697 proto = ethhdr->h_proto;
698
699 if (proto == htons(ETH_P_8021Q))
700 frame->is_vlan = true;
701
702 if (frame->is_vlan) {
703 if (skb->mac_len < offsetofend(struct hsr_vlan_ethhdr, vlanhdr))
704 return -EINVAL;
705 vlan_hdr = (struct hsr_vlan_ethhdr *)ethhdr;
706 proto = vlan_hdr->vlanhdr.h_vlan_encapsulated_proto;
707 }
708
709 frame->is_from_san = false;
710 frame->port_rcv = port;
711 ret = hsr->proto_ops->fill_frame_info(proto, skb, frame);
712 if (ret)
713 return ret;
714
715 check_local_dest(port->hsr, skb, frame);
716
717 return 0;
718 }
719
720 /* Must be called holding rcu read lock (because of the port parameter) */
hsr_forward_skb(struct sk_buff * skb,struct hsr_port * port)721 void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port)
722 {
723 struct hsr_frame_info frame;
724
725 rcu_read_lock();
726 if (fill_frame_info(&frame, skb, port) < 0)
727 goto out_drop;
728
729 hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);
730 hsr_forward_do(&frame);
731 rcu_read_unlock();
732 /* Gets called for ingress frames as well as egress from master port.
733 * So check and increment stats for master port only here.
734 */
735 if (port->type == HSR_PT_MASTER || port->type == HSR_PT_INTERLINK) {
736 port->dev->stats.tx_packets++;
737 port->dev->stats.tx_bytes += skb->len;
738 }
739
740 kfree_skb(frame.skb_hsr);
741 kfree_skb(frame.skb_prp);
742 kfree_skb(frame.skb_std);
743 return;
744
745 out_drop:
746 rcu_read_unlock();
747 port->dev->stats.tx_dropped++;
748 kfree_skb(skb);
749 }
750