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 int lsdu_size;
284
285 /* pad to minimum packet size which is 60 + 6 (HSR tag) */
286 if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
287 return NULL;
288
289 lsdu_size = skb->len - 14;
290 if (frame->is_vlan)
291 lsdu_size -= 4;
292
293 hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
294
295 hsr_set_path_id(hsr_ethhdr, port);
296 set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
297 hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
298 hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
299 hsr_ethhdr->ethhdr.h_proto = htons(proto_version ?
300 ETH_P_HSR : ETH_P_PRP);
301 skb->protocol = hsr_ethhdr->ethhdr.h_proto;
302
303 return skb;
304 }
305
306 /* If the original frame was an HSR tagged frame, just clone it to be sent
307 * unchanged. Otherwise, create a private frame especially tagged for 'port'.
308 */
hsr_create_tagged_frame(struct hsr_frame_info * frame,struct hsr_port * port)309 struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame,
310 struct hsr_port *port)
311 {
312 unsigned char *dst, *src;
313 struct sk_buff *skb;
314 int movelen;
315
316 if (frame->skb_hsr) {
317 struct hsr_ethhdr *hsr_ethhdr =
318 (struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr);
319
320 /* set the lane id properly */
321 hsr_set_path_id(hsr_ethhdr, port);
322 return skb_clone(frame->skb_hsr, GFP_ATOMIC);
323 } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) {
324 return skb_clone(frame->skb_std, GFP_ATOMIC);
325 }
326
327 /* Create the new skb with enough headroom to fit the HSR tag */
328 skb = __pskb_copy(frame->skb_std,
329 skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC);
330 if (!skb)
331 return NULL;
332 skb_reset_mac_header(skb);
333
334 if (skb->ip_summed == CHECKSUM_PARTIAL)
335 skb->csum_start += HSR_HLEN;
336
337 movelen = ETH_HLEN;
338 if (frame->is_vlan)
339 movelen += VLAN_HLEN;
340
341 src = skb_mac_header(skb);
342 dst = skb_push(skb, HSR_HLEN);
343 memmove(dst, src, movelen);
344 skb_reset_mac_header(skb);
345
346 /* skb_put_padto free skb on error and hsr_fill_tag returns NULL in
347 * that case
348 */
349 return hsr_fill_tag(skb, frame, port, port->hsr->prot_version);
350 }
351
prp_create_tagged_frame(struct hsr_frame_info * frame,struct hsr_port * port)352 struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame,
353 struct hsr_port *port)
354 {
355 struct sk_buff *skb;
356
357 if (frame->skb_prp) {
358 struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp);
359
360 if (trailer) {
361 prp_set_lan_id(trailer, port);
362 } else {
363 WARN_ONCE(!trailer, "errored PRP skb");
364 return NULL;
365 }
366 return skb_clone(frame->skb_prp, GFP_ATOMIC);
367 } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) {
368 return skb_clone(frame->skb_std, GFP_ATOMIC);
369 }
370
371 skb = skb_copy_expand(frame->skb_std, 0,
372 skb_tailroom(frame->skb_std) + HSR_HLEN,
373 GFP_ATOMIC);
374 return prp_fill_rct(skb, frame, port);
375 }
376
hsr_deliver_master(struct sk_buff * skb,struct net_device * dev,struct hsr_node * node_src)377 static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev,
378 struct hsr_node *node_src)
379 {
380 bool was_multicast_frame;
381 int res, recv_len;
382
383 was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST);
384 hsr_addr_subst_source(node_src, skb);
385 skb_pull(skb, ETH_HLEN);
386 recv_len = skb->len;
387 res = netif_rx(skb);
388 if (res == NET_RX_DROP) {
389 dev->stats.rx_dropped++;
390 } else {
391 dev->stats.rx_packets++;
392 dev->stats.rx_bytes += recv_len;
393 if (was_multicast_frame)
394 dev->stats.multicast++;
395 }
396 }
397
hsr_xmit(struct sk_buff * skb,struct hsr_port * port,struct hsr_frame_info * frame)398 static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port,
399 struct hsr_frame_info *frame)
400 {
401 if (frame->port_rcv->type == HSR_PT_MASTER) {
402 hsr_addr_subst_dest(frame->node_src, skb, port);
403
404 /* Address substitution (IEC62439-3 pp 26, 50): replace mac
405 * address of outgoing frame with that of the outgoing slave's.
406 */
407 ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr);
408 }
409
410 /* When HSR node is used as RedBox - the frame received from HSR ring
411 * requires source MAC address (SA) replacement to one which can be
412 * recognized by SAN devices (otherwise, frames are dropped by switch)
413 */
414 if (port->type == HSR_PT_INTERLINK)
415 ether_addr_copy(eth_hdr(skb)->h_source,
416 port->hsr->macaddress_redbox);
417
418 return dev_queue_xmit(skb);
419 }
420
prp_drop_frame(struct hsr_frame_info * frame,struct hsr_port * port)421 bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)
422 {
423 return ((frame->port_rcv->type == HSR_PT_SLAVE_A &&
424 port->type == HSR_PT_SLAVE_B) ||
425 (frame->port_rcv->type == HSR_PT_SLAVE_B &&
426 port->type == HSR_PT_SLAVE_A));
427 }
428
hsr_drop_frame(struct hsr_frame_info * frame,struct hsr_port * port)429 bool hsr_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)
430 {
431 struct sk_buff *skb;
432
433 if (port->dev->features & NETIF_F_HW_HSR_FWD)
434 return prp_drop_frame(frame, port);
435
436 /* RedBox specific frames dropping policies
437 *
438 * Do not send HSR supervisory frames to SAN devices
439 */
440 if (frame->is_supervision && port->type == HSR_PT_INTERLINK)
441 return true;
442
443 /* Do not forward to other HSR port (A or B) unicast frames which
444 * are addressed to interlink port (and are in the ProxyNodeTable).
445 */
446 skb = frame->skb_hsr;
447 if (skb && prp_drop_frame(frame, port) &&
448 is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
449 hsr_is_node_in_db(&port->hsr->proxy_node_db,
450 eth_hdr(skb)->h_dest)) {
451 return true;
452 }
453
454 /* Do not forward to port C (Interlink) frames from nodes A and B
455 * if DA is in NodeTable.
456 */
457 if ((frame->port_rcv->type == HSR_PT_SLAVE_A ||
458 frame->port_rcv->type == HSR_PT_SLAVE_B) &&
459 port->type == HSR_PT_INTERLINK) {
460 skb = frame->skb_hsr;
461 if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
462 hsr_is_node_in_db(&port->hsr->node_db,
463 eth_hdr(skb)->h_dest)) {
464 return true;
465 }
466 }
467
468 /* Do not forward to port A and B unicast frames received on the
469 * interlink port if it is addressed to one of nodes registered in
470 * the ProxyNodeTable.
471 */
472 if ((port->type == HSR_PT_SLAVE_A || port->type == HSR_PT_SLAVE_B) &&
473 frame->port_rcv->type == HSR_PT_INTERLINK) {
474 skb = frame->skb_std;
475 if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
476 hsr_is_node_in_db(&port->hsr->proxy_node_db,
477 eth_hdr(skb)->h_dest)) {
478 return true;
479 }
480 }
481
482 return false;
483 }
484
485 /* Forward the frame through all devices except:
486 * - Back through the receiving device
487 * - If it's a HSR frame: through a device where it has passed before
488 * - if it's a PRP frame: through another PRP slave device (no bridge)
489 * - To the local HSR master only if the frame is directly addressed to it, or
490 * a non-supervision multicast or broadcast frame.
491 *
492 * HSR slave devices should insert a HSR tag into the frame, or forward the
493 * frame unchanged if it's already tagged. Interlink devices should strip HSR
494 * tags if they're of the non-HSR type (but only after duplicate discard). The
495 * master device always strips HSR tags.
496 */
hsr_forward_do(struct hsr_frame_info * frame)497 static void hsr_forward_do(struct hsr_frame_info *frame)
498 {
499 struct hsr_port *port;
500 struct sk_buff *skb;
501 bool sent = false;
502
503 hsr_for_each_port(frame->port_rcv->hsr, port) {
504 struct hsr_priv *hsr = port->hsr;
505 /* Don't send frame back the way it came */
506 if (port == frame->port_rcv)
507 continue;
508
509 /* Don't deliver locally unless we should */
510 if (port->type == HSR_PT_MASTER && !frame->is_local_dest)
511 continue;
512
513 /* Deliver frames directly addressed to us to master only */
514 if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)
515 continue;
516
517 /* If hardware duplicate generation is enabled, only send out
518 * one port.
519 */
520 if ((port->dev->features & NETIF_F_HW_HSR_DUP) && sent)
521 continue;
522
523 /* Don't send frame over port where it has been sent before.
524 * Also for SAN, this shouldn't be done.
525 */
526 if (!frame->is_from_san &&
527 hsr_register_frame_out(port, frame->node_src,
528 frame->sequence_nr))
529 continue;
530
531 if (frame->is_supervision && port->type == HSR_PT_MASTER &&
532 !frame->is_proxy_supervision) {
533 hsr_handle_sup_frame(frame);
534 continue;
535 }
536
537 /* Check if frame is to be dropped. Eg. for PRP no forward
538 * between ports, or sending HSR supervision to RedBox.
539 */
540 if (hsr->proto_ops->drop_frame &&
541 hsr->proto_ops->drop_frame(frame, port))
542 continue;
543
544 if (port->type == HSR_PT_SLAVE_A ||
545 port->type == HSR_PT_SLAVE_B)
546 skb = hsr->proto_ops->create_tagged_frame(frame, port);
547 else
548 skb = hsr->proto_ops->get_untagged_frame(frame, port);
549
550 if (!skb) {
551 frame->port_rcv->dev->stats.rx_dropped++;
552 continue;
553 }
554
555 skb->dev = port->dev;
556 if (port->type == HSR_PT_MASTER) {
557 hsr_deliver_master(skb, port->dev, frame->node_src);
558 } else {
559 if (!hsr_xmit(skb, port, frame))
560 if (port->type == HSR_PT_SLAVE_A ||
561 port->type == HSR_PT_SLAVE_B)
562 sent = true;
563 }
564 }
565 }
566
check_local_dest(struct hsr_priv * hsr,struct sk_buff * skb,struct hsr_frame_info * frame)567 static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb,
568 struct hsr_frame_info *frame)
569 {
570 if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) {
571 frame->is_local_exclusive = true;
572 skb->pkt_type = PACKET_HOST;
573 } else {
574 frame->is_local_exclusive = false;
575 }
576
577 if (skb->pkt_type == PACKET_HOST ||
578 skb->pkt_type == PACKET_MULTICAST ||
579 skb->pkt_type == PACKET_BROADCAST) {
580 frame->is_local_dest = true;
581 } else {
582 frame->is_local_dest = false;
583 }
584 }
585
handle_std_frame(struct sk_buff * skb,struct hsr_frame_info * frame)586 static void handle_std_frame(struct sk_buff *skb,
587 struct hsr_frame_info *frame)
588 {
589 struct hsr_port *port = frame->port_rcv;
590 struct hsr_priv *hsr = port->hsr;
591
592 frame->skb_hsr = NULL;
593 frame->skb_prp = NULL;
594 frame->skb_std = skb;
595
596 if (port->type != HSR_PT_MASTER)
597 frame->is_from_san = true;
598
599 if (port->type == HSR_PT_MASTER ||
600 port->type == HSR_PT_INTERLINK) {
601 /* Sequence nr for the master/interlink node */
602 lockdep_assert_held(&hsr->seqnr_lock);
603 frame->sequence_nr = hsr->sequence_nr;
604 hsr->sequence_nr++;
605 }
606 }
607
hsr_fill_frame_info(__be16 proto,struct sk_buff * skb,struct hsr_frame_info * frame)608 int hsr_fill_frame_info(__be16 proto, struct sk_buff *skb,
609 struct hsr_frame_info *frame)
610 {
611 struct hsr_port *port = frame->port_rcv;
612 struct hsr_priv *hsr = port->hsr;
613
614 /* HSRv0 supervisory frames double as a tag so treat them as tagged. */
615 if ((!hsr->prot_version && proto == htons(ETH_P_PRP)) ||
616 proto == htons(ETH_P_HSR)) {
617 /* Check if skb contains hsr_ethhdr */
618 if (skb->mac_len < sizeof(struct hsr_ethhdr))
619 return -EINVAL;
620
621 /* HSR tagged frame :- Data or Supervision */
622 frame->skb_std = NULL;
623 frame->skb_prp = NULL;
624 frame->skb_hsr = skb;
625 frame->sequence_nr = hsr_get_skb_sequence_nr(skb);
626 return 0;
627 }
628
629 /* Standard frame or PRP from master port */
630 handle_std_frame(skb, frame);
631
632 return 0;
633 }
634
prp_fill_frame_info(__be16 proto,struct sk_buff * skb,struct hsr_frame_info * frame)635 int prp_fill_frame_info(__be16 proto, struct sk_buff *skb,
636 struct hsr_frame_info *frame)
637 {
638 /* Supervision frame */
639 struct prp_rct *rct = skb_get_PRP_rct(skb);
640
641 if (rct &&
642 prp_check_lsdu_size(skb, rct, frame->is_supervision)) {
643 frame->skb_hsr = NULL;
644 frame->skb_std = NULL;
645 frame->skb_prp = skb;
646 frame->sequence_nr = prp_get_skb_sequence_nr(rct);
647 return 0;
648 }
649 handle_std_frame(skb, frame);
650
651 return 0;
652 }
653
fill_frame_info(struct hsr_frame_info * frame,struct sk_buff * skb,struct hsr_port * port)654 static int fill_frame_info(struct hsr_frame_info *frame,
655 struct sk_buff *skb, struct hsr_port *port)
656 {
657 struct hsr_priv *hsr = port->hsr;
658 struct hsr_vlan_ethhdr *vlan_hdr;
659 struct list_head *n_db;
660 struct ethhdr *ethhdr;
661 __be16 proto;
662 int ret;
663
664 /* Check if skb contains ethhdr */
665 if (skb->mac_len < sizeof(struct ethhdr))
666 return -EINVAL;
667
668 memset(frame, 0, sizeof(*frame));
669 frame->is_supervision = is_supervision_frame(port->hsr, skb);
670 if (frame->is_supervision && hsr->redbox)
671 frame->is_proxy_supervision =
672 is_proxy_supervision_frame(port->hsr, skb);
673
674 n_db = &hsr->node_db;
675 if (port->type == HSR_PT_INTERLINK)
676 n_db = &hsr->proxy_node_db;
677
678 frame->node_src = hsr_get_node(port, n_db, skb,
679 frame->is_supervision, port->type);
680 if (!frame->node_src)
681 return -1; /* Unknown node and !is_supervision, or no mem */
682
683 ethhdr = (struct ethhdr *)skb_mac_header(skb);
684 frame->is_vlan = false;
685 proto = ethhdr->h_proto;
686
687 if (proto == htons(ETH_P_8021Q))
688 frame->is_vlan = true;
689
690 if (frame->is_vlan) {
691 vlan_hdr = (struct hsr_vlan_ethhdr *)ethhdr;
692 proto = vlan_hdr->vlanhdr.h_vlan_encapsulated_proto;
693 /* FIXME: */
694 netdev_warn_once(skb->dev, "VLAN not yet supported");
695 return -EINVAL;
696 }
697
698 frame->is_from_san = false;
699 frame->port_rcv = port;
700 ret = hsr->proto_ops->fill_frame_info(proto, skb, frame);
701 if (ret)
702 return ret;
703
704 check_local_dest(port->hsr, skb, frame);
705
706 return 0;
707 }
708
709 /* Must be called holding rcu read lock (because of the port parameter) */
hsr_forward_skb(struct sk_buff * skb,struct hsr_port * port)710 void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port)
711 {
712 struct hsr_frame_info frame;
713
714 rcu_read_lock();
715 if (fill_frame_info(&frame, skb, port) < 0)
716 goto out_drop;
717
718 hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);
719 hsr_forward_do(&frame);
720 rcu_read_unlock();
721 /* Gets called for ingress frames as well as egress from master port.
722 * So check and increment stats for master port only here.
723 */
724 if (port->type == HSR_PT_MASTER || port->type == HSR_PT_INTERLINK) {
725 port->dev->stats.tx_packets++;
726 port->dev->stats.tx_bytes += skb->len;
727 }
728
729 kfree_skb(frame.skb_hsr);
730 kfree_skb(frame.skb_prp);
731 kfree_skb(frame.skb_std);
732 return;
733
734 out_drop:
735 rcu_read_unlock();
736 port->dev->stats.tx_dropped++;
737 kfree_skb(skb);
738 }
739