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 */ 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 } 119 120 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 } 148 149 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 } 177 178 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 } 195 196 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 if (!frame->skb_std) 209 return NULL; 210 } else { 211 /* Unexpected */ 212 WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n", 213 __FILE__, __LINE__, port->dev->name); 214 return NULL; 215 } 216 } 217 218 return skb_clone(frame->skb_std, GFP_ATOMIC); 219 } 220 221 static void prp_set_lan_id(struct prp_rct *trailer, 222 struct hsr_port *port) 223 { 224 int lane_id; 225 226 if (port->type == HSR_PT_SLAVE_A) 227 lane_id = 0; 228 else 229 lane_id = 1; 230 231 /* Add net_id in the upper 3 bits of lane_id */ 232 lane_id |= port->hsr->net_id; 233 set_prp_lan_id(trailer, lane_id); 234 } 235 236 /* Tailroom for PRP rct should have been created before calling this */ 237 static struct sk_buff *prp_fill_rct(struct sk_buff *skb, 238 struct hsr_frame_info *frame, 239 struct hsr_port *port) 240 { 241 struct prp_rct *trailer; 242 int min_size = ETH_ZLEN; 243 int lsdu_size; 244 245 if (!skb) 246 return skb; 247 248 if (frame->is_vlan) 249 min_size = VLAN_ETH_ZLEN; 250 251 if (skb_put_padto(skb, min_size)) 252 return NULL; 253 254 trailer = (struct prp_rct *)skb_put(skb, HSR_HLEN); 255 lsdu_size = skb->len - 14; 256 if (frame->is_vlan) 257 lsdu_size -= 4; 258 prp_set_lan_id(trailer, port); 259 set_prp_LSDU_size(trailer, lsdu_size); 260 trailer->sequence_nr = htons(frame->sequence_nr); 261 trailer->PRP_suffix = htons(ETH_P_PRP); 262 skb->protocol = eth_hdr(skb)->h_proto; 263 264 return skb; 265 } 266 267 static void hsr_set_path_id(struct hsr_frame_info *frame, 268 struct hsr_ethhdr *hsr_ethhdr, 269 struct hsr_port *port) 270 { 271 int path_id; 272 273 if (port->hsr->prot_version) { 274 if (port->type == HSR_PT_SLAVE_A) 275 path_id = 0; 276 else 277 path_id = 1; 278 } else { 279 if (frame->is_supervision) 280 path_id = 0xf; 281 else 282 path_id = 1; 283 } 284 285 set_hsr_tag_path(&hsr_ethhdr->hsr_tag, path_id); 286 } 287 288 static struct sk_buff *hsr_fill_tag(struct sk_buff *skb, 289 struct hsr_frame_info *frame, 290 struct hsr_port *port, u8 proto_version) 291 { 292 struct hsr_ethhdr *hsr_ethhdr; 293 unsigned char *pc; 294 int lsdu_size; 295 296 /* pad to minimum packet size which is 60 + 6 (HSR tag) */ 297 if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN)) 298 return NULL; 299 300 lsdu_size = skb->len - 14; 301 if (frame->is_vlan) 302 lsdu_size -= 4; 303 304 pc = skb_mac_header(skb); 305 if (frame->is_vlan) 306 /* This 4-byte shift (size of a vlan tag) does not 307 * mean that the ethhdr starts there. But rather it 308 * provides the proper environment for accessing 309 * the fields, such as hsr_tag etc., just like 310 * when the vlan tag is not there. This is because 311 * the hsr tag is after the vlan tag. 312 */ 313 hsr_ethhdr = (struct hsr_ethhdr *)(pc + VLAN_HLEN); 314 else 315 hsr_ethhdr = (struct hsr_ethhdr *)pc; 316 317 hsr_set_path_id(frame, hsr_ethhdr, port); 318 set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size); 319 hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr); 320 hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto; 321 hsr_ethhdr->ethhdr.h_proto = htons(proto_version ? 322 ETH_P_HSR : ETH_P_PRP); 323 skb->protocol = hsr_ethhdr->ethhdr.h_proto; 324 325 return skb; 326 } 327 328 /* If the original frame was an HSR tagged frame, just clone it to be sent 329 * unchanged. Otherwise, create a private frame especially tagged for 'port'. 330 */ 331 struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame, 332 struct hsr_port *port) 333 { 334 unsigned char *dst, *src; 335 struct sk_buff *skb; 336 int movelen; 337 338 if (frame->skb_hsr) { 339 struct hsr_ethhdr *hsr_ethhdr = 340 (struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr); 341 342 /* set the lane id properly */ 343 hsr_set_path_id(frame, hsr_ethhdr, port); 344 return skb_clone(frame->skb_hsr, GFP_ATOMIC); 345 } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) { 346 return skb_clone(frame->skb_std, GFP_ATOMIC); 347 } 348 349 /* Create the new skb with enough headroom to fit the HSR tag */ 350 skb = __pskb_copy(frame->skb_std, 351 skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC); 352 if (!skb) 353 return NULL; 354 skb_reset_mac_header(skb); 355 356 if (skb->ip_summed == CHECKSUM_PARTIAL) 357 skb->csum_start += HSR_HLEN; 358 359 movelen = ETH_HLEN; 360 if (frame->is_vlan) 361 movelen += VLAN_HLEN; 362 363 src = skb_mac_header(skb); 364 dst = skb_push(skb, HSR_HLEN); 365 memmove(dst, src, movelen); 366 skb_reset_mac_header(skb); 367 368 /* skb_put_padto free skb on error and hsr_fill_tag returns NULL in 369 * that case 370 */ 371 return hsr_fill_tag(skb, frame, port, port->hsr->prot_version); 372 } 373 374 struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame, 375 struct hsr_port *port) 376 { 377 struct sk_buff *skb; 378 379 if (frame->skb_prp) { 380 struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp); 381 382 if (trailer) { 383 prp_set_lan_id(trailer, port); 384 } else { 385 WARN_ONCE(!trailer, "errored PRP skb"); 386 return NULL; 387 } 388 return skb_clone(frame->skb_prp, GFP_ATOMIC); 389 } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) { 390 return skb_clone(frame->skb_std, GFP_ATOMIC); 391 } 392 393 skb = skb_copy_expand(frame->skb_std, skb_headroom(frame->skb_std), 394 skb_tailroom(frame->skb_std) + HSR_HLEN, 395 GFP_ATOMIC); 396 return prp_fill_rct(skb, frame, port); 397 } 398 399 static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev, 400 struct hsr_node *node_src) 401 { 402 bool was_multicast_frame; 403 int res, recv_len; 404 405 was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST); 406 hsr_addr_subst_source(node_src, skb); 407 skb_pull(skb, ETH_HLEN); 408 recv_len = skb->len; 409 res = netif_rx(skb); 410 if (res == NET_RX_DROP) { 411 dev->stats.rx_dropped++; 412 } else { 413 dev->stats.rx_packets++; 414 dev->stats.rx_bytes += recv_len; 415 if (was_multicast_frame) 416 dev->stats.multicast++; 417 } 418 } 419 420 static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port, 421 struct hsr_frame_info *frame) 422 { 423 if (frame->port_rcv->type == HSR_PT_MASTER) { 424 hsr_addr_subst_dest(frame->node_src, skb, port); 425 426 /* Address substitution (IEC62439-3 pp 26, 50): replace mac 427 * address of outgoing frame with that of the outgoing slave's. 428 */ 429 ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr); 430 } 431 432 /* When HSR node is used as RedBox - the frame received from HSR ring 433 * requires source MAC address (SA) replacement to one which can be 434 * recognized by SAN devices (otherwise, frames are dropped by switch) 435 */ 436 if (port->type == HSR_PT_INTERLINK) 437 ether_addr_copy(eth_hdr(skb)->h_source, 438 port->hsr->macaddress_redbox); 439 440 return dev_queue_xmit(skb); 441 } 442 443 bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port) 444 { 445 return ((frame->port_rcv->type == HSR_PT_SLAVE_A && 446 port->type == HSR_PT_SLAVE_B) || 447 (frame->port_rcv->type == HSR_PT_SLAVE_B && 448 port->type == HSR_PT_SLAVE_A)); 449 } 450 451 bool hsr_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port) 452 { 453 struct sk_buff *skb; 454 455 if (port->dev->features & NETIF_F_HW_HSR_FWD) 456 return prp_drop_frame(frame, port); 457 458 /* RedBox specific frames dropping policies 459 * 460 * Do not send HSR supervisory frames to SAN devices 461 */ 462 if (frame->is_supervision && port->type == HSR_PT_INTERLINK) 463 return true; 464 465 /* Do not forward to other HSR port (A or B) unicast frames which 466 * are addressed to interlink port (and are in the ProxyNodeTable). 467 */ 468 skb = frame->skb_hsr; 469 if (skb && prp_drop_frame(frame, port) && 470 is_unicast_ether_addr(eth_hdr(skb)->h_dest) && 471 hsr_is_node_in_db(&port->hsr->proxy_node_db, 472 eth_hdr(skb)->h_dest)) { 473 return true; 474 } 475 476 /* Do not forward to port C (Interlink) frames from nodes A and B 477 * if DA is in NodeTable. 478 */ 479 if ((frame->port_rcv->type == HSR_PT_SLAVE_A || 480 frame->port_rcv->type == HSR_PT_SLAVE_B) && 481 port->type == HSR_PT_INTERLINK) { 482 skb = frame->skb_hsr; 483 if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) && 484 hsr_is_node_in_db(&port->hsr->node_db, 485 eth_hdr(skb)->h_dest)) { 486 return true; 487 } 488 } 489 490 /* Do not forward to port A and B unicast frames received on the 491 * interlink port if it is addressed to one of nodes registered in 492 * the ProxyNodeTable. 493 */ 494 if ((port->type == HSR_PT_SLAVE_A || port->type == HSR_PT_SLAVE_B) && 495 frame->port_rcv->type == HSR_PT_INTERLINK) { 496 skb = frame->skb_std; 497 if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) && 498 hsr_is_node_in_db(&port->hsr->proxy_node_db, 499 eth_hdr(skb)->h_dest)) { 500 return true; 501 } 502 } 503 504 return false; 505 } 506 507 /* Forward the frame through all devices except: 508 * - Back through the receiving device 509 * - If it's a HSR frame: through a device where it has passed before 510 * - if it's a PRP frame: through another PRP slave device (no bridge) 511 * - To the local HSR master only if the frame is directly addressed to it, or 512 * a non-supervision multicast or broadcast frame. 513 * 514 * HSR slave devices should insert a HSR tag into the frame, or forward the 515 * frame unchanged if it's already tagged. Interlink devices should strip HSR 516 * tags if they're of the non-HSR type (but only after duplicate discard). The 517 * master device always strips HSR tags. 518 */ 519 static void hsr_forward_do(struct hsr_frame_info *frame) 520 { 521 struct hsr_port *port; 522 struct sk_buff *skb; 523 bool sent = false; 524 525 hsr_for_each_port(frame->port_rcv->hsr, port) { 526 struct hsr_priv *hsr = port->hsr; 527 /* Don't send frame back the way it came */ 528 if (port == frame->port_rcv) 529 continue; 530 531 /* Don't deliver locally unless we should */ 532 if (port->type == HSR_PT_MASTER && !frame->is_local_dest) 533 continue; 534 535 /* Deliver frames directly addressed to us to master only */ 536 if (port->type != HSR_PT_MASTER && frame->is_local_exclusive) 537 continue; 538 539 /* If hardware duplicate generation is enabled, only send out 540 * one port. 541 */ 542 if ((port->dev->features & NETIF_F_HW_HSR_DUP) && sent) 543 continue; 544 545 /* Don't send frame over port where it has been sent before. 546 * Also for SAN, this shouldn't be done. 547 */ 548 if (!frame->is_from_san && 549 hsr->proto_ops->register_frame_out && 550 hsr->proto_ops->register_frame_out(port, frame)) 551 continue; 552 553 if (frame->is_supervision && port->type == HSR_PT_MASTER && 554 !frame->is_proxy_supervision) { 555 hsr_handle_sup_frame(frame); 556 continue; 557 } 558 559 /* Check if frame is to be dropped. Eg. for PRP no forward 560 * between ports, or sending HSR supervision to RedBox. 561 */ 562 if (hsr->proto_ops->drop_frame && 563 hsr->proto_ops->drop_frame(frame, port)) 564 continue; 565 566 if (port->type == HSR_PT_SLAVE_A || 567 port->type == HSR_PT_SLAVE_B) 568 skb = hsr->proto_ops->create_tagged_frame(frame, port); 569 else 570 skb = hsr->proto_ops->get_untagged_frame(frame, port); 571 572 if (!skb) { 573 frame->port_rcv->dev->stats.rx_dropped++; 574 continue; 575 } 576 577 skb->dev = port->dev; 578 if (port->type == HSR_PT_MASTER) { 579 hsr_deliver_master(skb, port->dev, frame->node_src); 580 } else { 581 if (!hsr_xmit(skb, port, frame)) 582 if (port->type == HSR_PT_SLAVE_A || 583 port->type == HSR_PT_SLAVE_B) 584 sent = true; 585 } 586 } 587 } 588 589 static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb, 590 struct hsr_frame_info *frame) 591 { 592 if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) { 593 frame->is_local_exclusive = true; 594 skb->pkt_type = PACKET_HOST; 595 } else { 596 frame->is_local_exclusive = false; 597 } 598 599 if (skb->pkt_type == PACKET_HOST || 600 skb->pkt_type == PACKET_MULTICAST || 601 skb->pkt_type == PACKET_BROADCAST) { 602 frame->is_local_dest = true; 603 } else { 604 frame->is_local_dest = false; 605 } 606 } 607 608 static void handle_std_frame(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 frame->skb_hsr = NULL; 615 frame->skb_prp = NULL; 616 frame->skb_std = skb; 617 618 if (port->type != HSR_PT_MASTER) 619 frame->is_from_san = true; 620 621 if (port->type == HSR_PT_MASTER || 622 port->type == HSR_PT_INTERLINK) { 623 /* Sequence nr for the master/interlink node */ 624 lockdep_assert_held(&hsr->seqnr_lock); 625 frame->sequence_nr = hsr->sequence_nr; 626 hsr->sequence_nr++; 627 } 628 } 629 630 int hsr_fill_frame_info(__be16 proto, struct sk_buff *skb, 631 struct hsr_frame_info *frame) 632 { 633 struct hsr_port *port = frame->port_rcv; 634 struct hsr_priv *hsr = port->hsr; 635 636 /* HSRv0 supervisory frames double as a tag so treat them as tagged. */ 637 if ((!hsr->prot_version && proto == htons(ETH_P_PRP)) || 638 proto == htons(ETH_P_HSR)) { 639 /* Check if skb contains hsr_ethhdr */ 640 if (skb->mac_len < sizeof(struct hsr_ethhdr)) 641 return -EINVAL; 642 643 /* HSR tagged frame :- Data or Supervision */ 644 frame->skb_std = NULL; 645 frame->skb_prp = NULL; 646 frame->skb_hsr = skb; 647 frame->sequence_nr = hsr_get_skb_sequence_nr(skb); 648 return 0; 649 } 650 651 /* Standard frame or PRP from master port */ 652 handle_std_frame(skb, frame); 653 654 return 0; 655 } 656 657 int prp_fill_frame_info(__be16 proto, struct sk_buff *skb, 658 struct hsr_frame_info *frame) 659 { 660 /* Supervision frame */ 661 struct prp_rct *rct = skb_get_PRP_rct(skb); 662 663 if (rct && 664 prp_check_lsdu_size(skb, rct, frame->is_supervision)) { 665 frame->skb_hsr = NULL; 666 frame->skb_std = NULL; 667 frame->skb_prp = skb; 668 frame->sequence_nr = prp_get_skb_sequence_nr(rct); 669 return 0; 670 } 671 handle_std_frame(skb, frame); 672 673 return 0; 674 } 675 676 static int fill_frame_info(struct hsr_frame_info *frame, 677 struct sk_buff *skb, struct hsr_port *port) 678 { 679 struct hsr_priv *hsr = port->hsr; 680 struct hsr_vlan_ethhdr *vlan_hdr; 681 struct list_head *n_db; 682 struct ethhdr *ethhdr; 683 __be16 proto; 684 int ret; 685 686 /* Check if skb contains ethhdr */ 687 if (skb->mac_len < sizeof(struct ethhdr)) 688 return -EINVAL; 689 690 memset(frame, 0, sizeof(*frame)); 691 frame->is_supervision = is_supervision_frame(port->hsr, skb); 692 if (frame->is_supervision && hsr->redbox) 693 frame->is_proxy_supervision = 694 is_proxy_supervision_frame(port->hsr, skb); 695 696 n_db = &hsr->node_db; 697 if (port->type == HSR_PT_INTERLINK) 698 n_db = &hsr->proxy_node_db; 699 700 frame->node_src = hsr_get_node(port, n_db, skb, 701 frame->is_supervision, port->type); 702 if (!frame->node_src) 703 return -1; /* Unknown node and !is_supervision, or no mem */ 704 705 ethhdr = (struct ethhdr *)skb_mac_header(skb); 706 frame->is_vlan = false; 707 proto = ethhdr->h_proto; 708 709 if (proto == htons(ETH_P_8021Q)) 710 frame->is_vlan = true; 711 712 if (frame->is_vlan) { 713 /* Note: skb->mac_len might be wrong here. */ 714 if (!pskb_may_pull(skb, 715 skb_mac_offset(skb) + 716 offsetofend(struct hsr_vlan_ethhdr, vlanhdr))) 717 return -EINVAL; 718 vlan_hdr = (struct hsr_vlan_ethhdr *)skb_mac_header(skb); 719 proto = vlan_hdr->vlanhdr.h_vlan_encapsulated_proto; 720 } 721 722 frame->is_from_san = false; 723 frame->port_rcv = port; 724 ret = hsr->proto_ops->fill_frame_info(proto, skb, frame); 725 if (ret) 726 return ret; 727 728 check_local_dest(port->hsr, skb, frame); 729 730 return 0; 731 } 732 733 /* Must be called holding rcu read lock (because of the port parameter) */ 734 void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port) 735 { 736 struct hsr_frame_info frame; 737 738 rcu_read_lock(); 739 if (fill_frame_info(&frame, skb, port) < 0) 740 goto out_drop; 741 742 hsr_register_frame_in(frame.node_src, port, frame.sequence_nr); 743 hsr_forward_do(&frame); 744 rcu_read_unlock(); 745 /* Gets called for ingress frames as well as egress from master port. 746 * So check and increment stats for master port only here. 747 */ 748 if (port->type == HSR_PT_MASTER || port->type == HSR_PT_INTERLINK) { 749 port->dev->stats.tx_packets++; 750 port->dev->stats.tx_bytes += skb->len; 751 } 752 753 kfree_skb(frame.skb_hsr); 754 kfree_skb(frame.skb_prp); 755 kfree_skb(frame.skb_std); 756 return; 757 758 out_drop: 759 rcu_read_unlock(); 760 port->dev->stats.tx_dropped++; 761 kfree_skb(skb); 762 } 763