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0e7623bd | 1 | // SPDX-License-Identifier: GPL-2.0 |
f266a683 | 2 | /* Copyright 2011-2014 Autronica Fire and Security AS |
f266a683 AB |
3 | * |
4 | * Author(s): | |
5 | * 2011-2014 Arvid Brodin, arvid.brodin@alten.se | |
6 | */ | |
7 | ||
8 | #include "hsr_forward.h" | |
9 | #include <linux/types.h> | |
10 | #include <linux/skbuff.h> | |
11 | #include <linux/etherdevice.h> | |
12 | #include <linux/if_vlan.h> | |
13 | #include "hsr_main.h" | |
14 | #include "hsr_framereg.h" | |
15 | ||
f266a683 AB |
16 | struct hsr_node; |
17 | ||
18 | struct hsr_frame_info { | |
19 | struct sk_buff *skb_std; | |
20 | struct sk_buff *skb_hsr; | |
21 | struct hsr_port *port_rcv; | |
22 | struct hsr_node *node_src; | |
23 | u16 sequence_nr; | |
24 | bool is_supervision; | |
25 | bool is_vlan; | |
26 | bool is_local_dest; | |
27 | bool is_local_exclusive; | |
28 | }; | |
29 | ||
f266a683 AB |
30 | /* The uses I can see for these HSR supervision frames are: |
31 | * 1) Use the frames that are sent after node initialization ("HSR_TLV.Type = | |
32 | * 22") to reset any sequence_nr counters belonging to that node. Useful if | |
33 | * the other node's counter has been reset for some reason. | |
34 | * -- | |
35 | * Or not - resetting the counter and bridging the frame would create a | |
36 | * loop, unfortunately. | |
37 | * | |
38 | * 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck | |
39 | * frame is received from a particular node, we know something is wrong. | |
40 | * We just register these (as with normal frames) and throw them away. | |
41 | * | |
42 | * 3) Allow different MAC addresses for the two slave interfaces, using the | |
43 | * MacAddressA field. | |
44 | */ | |
45 | static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb) | |
46 | { | |
b1b4aa91 MK |
47 | struct ethhdr *eth_hdr; |
48 | struct hsr_sup_tag *hsr_sup_tag; | |
49 | struct hsrv1_ethhdr_sp *hsr_V1_hdr; | |
f266a683 AB |
50 | |
51 | WARN_ON_ONCE(!skb_mac_header_was_set(skb)); | |
b1b4aa91 | 52 | eth_hdr = (struct ethhdr *)skb_mac_header(skb); |
f266a683 | 53 | |
ee1c2797 | 54 | /* Correct addr? */ |
b1b4aa91 | 55 | if (!ether_addr_equal(eth_hdr->h_dest, |
f266a683 AB |
56 | hsr->sup_multicast_addr)) |
57 | return false; | |
58 | ||
ee1c2797 | 59 | /* Correct ether type?. */ |
b1b4aa91 MK |
60 | if (!(eth_hdr->h_proto == htons(ETH_P_PRP) || |
61 | eth_hdr->h_proto == htons(ETH_P_HSR))) | |
f266a683 | 62 | return false; |
ee1c2797 PH |
63 | |
64 | /* Get the supervision header from correct location. */ | |
b1b4aa91 MK |
65 | if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */ |
66 | hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb); | |
67 | if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP)) | |
ee1c2797 PH |
68 | return false; |
69 | ||
b1b4aa91 | 70 | hsr_sup_tag = &hsr_V1_hdr->hsr_sup; |
ee1c2797 | 71 | } else { |
b1b4aa91 | 72 | hsr_sup_tag = |
5fa96778 | 73 | &((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup; |
ee1c2797 PH |
74 | } |
75 | ||
b1b4aa91 MK |
76 | if (hsr_sup_tag->HSR_TLV_type != HSR_TLV_ANNOUNCE && |
77 | hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK) | |
f266a683 | 78 | return false; |
b1b4aa91 MK |
79 | if (hsr_sup_tag->HSR_TLV_length != 12 && |
80 | hsr_sup_tag->HSR_TLV_length != sizeof(struct hsr_sup_payload)) | |
f266a683 AB |
81 | return false; |
82 | ||
83 | return true; | |
84 | } | |
85 | ||
f266a683 AB |
86 | static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in, |
87 | struct hsr_frame_info *frame) | |
88 | { | |
89 | struct sk_buff *skb; | |
90 | int copylen; | |
91 | unsigned char *dst, *src; | |
92 | ||
93 | skb_pull(skb_in, HSR_HLEN); | |
94 | skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC); | |
95 | skb_push(skb_in, HSR_HLEN); | |
05ca6e64 | 96 | if (!skb) |
f266a683 AB |
97 | return NULL; |
98 | ||
99 | skb_reset_mac_header(skb); | |
100 | ||
101 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
102 | skb->csum_start -= HSR_HLEN; | |
103 | ||
d131fcc6 | 104 | copylen = 2 * ETH_ALEN; |
f266a683 AB |
105 | if (frame->is_vlan) |
106 | copylen += VLAN_HLEN; | |
107 | src = skb_mac_header(skb_in); | |
108 | dst = skb_mac_header(skb); | |
109 | memcpy(dst, src, copylen); | |
110 | ||
111 | skb->protocol = eth_hdr(skb)->h_proto; | |
112 | return skb; | |
113 | } | |
114 | ||
115 | static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame, | |
116 | struct hsr_port *port) | |
117 | { | |
118 | if (!frame->skb_std) | |
119 | frame->skb_std = create_stripped_skb(frame->skb_hsr, frame); | |
120 | return skb_clone(frame->skb_std, GFP_ATOMIC); | |
121 | } | |
122 | ||
f266a683 | 123 | static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame, |
b1b4aa91 | 124 | struct hsr_port *port, u8 proto_version) |
f266a683 AB |
125 | { |
126 | struct hsr_ethhdr *hsr_ethhdr; | |
127 | int lane_id; | |
128 | int lsdu_size; | |
129 | ||
130 | if (port->type == HSR_PT_SLAVE_A) | |
131 | lane_id = 0; | |
132 | else | |
133 | lane_id = 1; | |
134 | ||
135 | lsdu_size = skb->len - 14; | |
136 | if (frame->is_vlan) | |
137 | lsdu_size -= 4; | |
138 | ||
5fa96778 | 139 | hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb); |
f266a683 AB |
140 | |
141 | set_hsr_tag_path(&hsr_ethhdr->hsr_tag, lane_id); | |
142 | set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size); | |
143 | hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr); | |
144 | hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto; | |
b1b4aa91 | 145 | hsr_ethhdr->ethhdr.h_proto = htons(proto_version ? |
ee1c2797 | 146 | ETH_P_HSR : ETH_P_PRP); |
f266a683 AB |
147 | } |
148 | ||
149 | static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o, | |
150 | struct hsr_frame_info *frame, | |
151 | struct hsr_port *port) | |
152 | { | |
153 | int movelen; | |
154 | unsigned char *dst, *src; | |
155 | struct sk_buff *skb; | |
156 | ||
157 | /* Create the new skb with enough headroom to fit the HSR tag */ | |
158 | skb = __pskb_copy(skb_o, skb_headroom(skb_o) + HSR_HLEN, GFP_ATOMIC); | |
05ca6e64 | 159 | if (!skb) |
f266a683 AB |
160 | return NULL; |
161 | skb_reset_mac_header(skb); | |
162 | ||
163 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
164 | skb->csum_start += HSR_HLEN; | |
165 | ||
166 | movelen = ETH_HLEN; | |
167 | if (frame->is_vlan) | |
168 | movelen += VLAN_HLEN; | |
169 | ||
170 | src = skb_mac_header(skb); | |
171 | dst = skb_push(skb, HSR_HLEN); | |
172 | memmove(dst, src, movelen); | |
173 | skb_reset_mac_header(skb); | |
174 | ||
b1b4aa91 | 175 | hsr_fill_tag(skb, frame, port, port->hsr->prot_version); |
f266a683 AB |
176 | |
177 | return skb; | |
178 | } | |
179 | ||
180 | /* If the original frame was an HSR tagged frame, just clone it to be sent | |
181 | * unchanged. Otherwise, create a private frame especially tagged for 'port'. | |
182 | */ | |
183 | static struct sk_buff *frame_get_tagged_skb(struct hsr_frame_info *frame, | |
184 | struct hsr_port *port) | |
185 | { | |
186 | if (frame->skb_hsr) | |
187 | return skb_clone(frame->skb_hsr, GFP_ATOMIC); | |
188 | ||
5670342c | 189 | if (port->type != HSR_PT_SLAVE_A && port->type != HSR_PT_SLAVE_B) { |
f266a683 AB |
190 | WARN_ONCE(1, "HSR: Bug: trying to create a tagged frame for a non-ring port"); |
191 | return NULL; | |
192 | } | |
193 | ||
194 | return create_tagged_skb(frame->skb_std, frame, port); | |
195 | } | |
196 | ||
f266a683 AB |
197 | static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev, |
198 | struct hsr_node *node_src) | |
199 | { | |
200 | bool was_multicast_frame; | |
201 | int res; | |
202 | ||
203 | was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST); | |
204 | hsr_addr_subst_source(node_src, skb); | |
205 | skb_pull(skb, ETH_HLEN); | |
206 | res = netif_rx(skb); | |
207 | if (res == NET_RX_DROP) { | |
208 | dev->stats.rx_dropped++; | |
209 | } else { | |
210 | dev->stats.rx_packets++; | |
211 | dev->stats.rx_bytes += skb->len; | |
212 | if (was_multicast_frame) | |
213 | dev->stats.multicast++; | |
214 | } | |
215 | } | |
216 | ||
217 | static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port, | |
218 | struct hsr_frame_info *frame) | |
219 | { | |
220 | if (frame->port_rcv->type == HSR_PT_MASTER) { | |
221 | hsr_addr_subst_dest(frame->node_src, skb, port); | |
222 | ||
223 | /* Address substitution (IEC62439-3 pp 26, 50): replace mac | |
224 | * address of outgoing frame with that of the outgoing slave's. | |
225 | */ | |
226 | ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr); | |
227 | } | |
228 | return dev_queue_xmit(skb); | |
229 | } | |
230 | ||
f266a683 AB |
231 | /* Forward the frame through all devices except: |
232 | * - Back through the receiving device | |
233 | * - If it's a HSR frame: through a device where it has passed before | |
234 | * - To the local HSR master only if the frame is directly addressed to it, or | |
235 | * a non-supervision multicast or broadcast frame. | |
236 | * | |
237 | * HSR slave devices should insert a HSR tag into the frame, or forward the | |
238 | * frame unchanged if it's already tagged. Interlink devices should strip HSR | |
239 | * tags if they're of the non-HSR type (but only after duplicate discard). The | |
240 | * master device always strips HSR tags. | |
241 | */ | |
242 | static void hsr_forward_do(struct hsr_frame_info *frame) | |
243 | { | |
244 | struct hsr_port *port; | |
245 | struct sk_buff *skb; | |
246 | ||
247 | hsr_for_each_port(frame->port_rcv->hsr, port) { | |
248 | /* Don't send frame back the way it came */ | |
249 | if (port == frame->port_rcv) | |
250 | continue; | |
251 | ||
252 | /* Don't deliver locally unless we should */ | |
5670342c | 253 | if (port->type == HSR_PT_MASTER && !frame->is_local_dest) |
f266a683 AB |
254 | continue; |
255 | ||
256 | /* Deliver frames directly addressed to us to master only */ | |
5670342c | 257 | if (port->type != HSR_PT_MASTER && frame->is_local_exclusive) |
f266a683 AB |
258 | continue; |
259 | ||
260 | /* Don't send frame over port where it has been sent before */ | |
261 | if (hsr_register_frame_out(port, frame->node_src, | |
262 | frame->sequence_nr)) | |
263 | continue; | |
264 | ||
5670342c | 265 | if (frame->is_supervision && port->type == HSR_PT_MASTER) { |
f266a683 AB |
266 | hsr_handle_sup_frame(frame->skb_hsr, |
267 | frame->node_src, | |
268 | frame->port_rcv); | |
269 | continue; | |
270 | } | |
271 | ||
272 | if (port->type != HSR_PT_MASTER) | |
273 | skb = frame_get_tagged_skb(frame, port); | |
274 | else | |
275 | skb = frame_get_stripped_skb(frame, port); | |
05ca6e64 | 276 | if (!skb) { |
f266a683 AB |
277 | /* FIXME: Record the dropped frame? */ |
278 | continue; | |
279 | } | |
280 | ||
281 | skb->dev = port->dev; | |
282 | if (port->type == HSR_PT_MASTER) | |
283 | hsr_deliver_master(skb, port->dev, frame->node_src); | |
284 | else | |
285 | hsr_xmit(skb, port, frame); | |
286 | } | |
287 | } | |
288 | ||
f266a683 AB |
289 | static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb, |
290 | struct hsr_frame_info *frame) | |
291 | { | |
f266a683 AB |
292 | if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) { |
293 | frame->is_local_exclusive = true; | |
294 | skb->pkt_type = PACKET_HOST; | |
295 | } else { | |
296 | frame->is_local_exclusive = false; | |
297 | } | |
298 | ||
5670342c MK |
299 | if (skb->pkt_type == PACKET_HOST || |
300 | skb->pkt_type == PACKET_MULTICAST || | |
301 | skb->pkt_type == PACKET_BROADCAST) { | |
f266a683 AB |
302 | frame->is_local_dest = true; |
303 | } else { | |
304 | frame->is_local_dest = false; | |
305 | } | |
306 | } | |
307 | ||
f266a683 AB |
308 | static int hsr_fill_frame_info(struct hsr_frame_info *frame, |
309 | struct sk_buff *skb, struct hsr_port *port) | |
310 | { | |
311 | struct ethhdr *ethhdr; | |
312 | unsigned long irqflags; | |
313 | ||
314 | frame->is_supervision = is_supervision_frame(port->hsr, skb); | |
675c8da0 | 315 | frame->node_src = hsr_get_node(port, skb, frame->is_supervision); |
05ca6e64 | 316 | if (!frame->node_src) |
f266a683 AB |
317 | return -1; /* Unknown node and !is_supervision, or no mem */ |
318 | ||
5fa96778 | 319 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
f266a683 AB |
320 | frame->is_vlan = false; |
321 | if (ethhdr->h_proto == htons(ETH_P_8021Q)) { | |
322 | frame->is_vlan = true; | |
323 | /* FIXME: */ | |
324 | WARN_ONCE(1, "HSR: VLAN not yet supported"); | |
325 | } | |
05947783 MK |
326 | if (ethhdr->h_proto == htons(ETH_P_PRP) || |
327 | ethhdr->h_proto == htons(ETH_P_HSR)) { | |
f266a683 AB |
328 | frame->skb_std = NULL; |
329 | frame->skb_hsr = skb; | |
330 | frame->sequence_nr = hsr_get_skb_sequence_nr(skb); | |
331 | } else { | |
332 | frame->skb_std = skb; | |
333 | frame->skb_hsr = NULL; | |
334 | /* Sequence nr for the master node */ | |
335 | spin_lock_irqsave(&port->hsr->seqnr_lock, irqflags); | |
336 | frame->sequence_nr = port->hsr->sequence_nr; | |
337 | port->hsr->sequence_nr++; | |
338 | spin_unlock_irqrestore(&port->hsr->seqnr_lock, irqflags); | |
339 | } | |
340 | ||
341 | frame->port_rcv = port; | |
342 | check_local_dest(port->hsr, skb, frame); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | /* Must be called holding rcu read lock (because of the port parameter) */ | |
348 | void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port) | |
349 | { | |
350 | struct hsr_frame_info frame; | |
351 | ||
352 | if (skb_mac_header(skb) != skb->data) { | |
353 | WARN_ONCE(1, "%s:%d: Malformed frame (port_src %s)\n", | |
354 | __FILE__, __LINE__, port->dev->name); | |
355 | goto out_drop; | |
356 | } | |
357 | ||
358 | if (hsr_fill_frame_info(&frame, skb, port) < 0) | |
359 | goto out_drop; | |
360 | hsr_register_frame_in(frame.node_src, port, frame.sequence_nr); | |
361 | hsr_forward_do(&frame); | |
ee2c46f3 MK |
362 | /* Gets called for ingress frames as well as egress from master port. |
363 | * So check and increment stats for master port only here. | |
364 | */ | |
365 | if (port->type == HSR_PT_MASTER) { | |
366 | port->dev->stats.tx_packets++; | |
367 | port->dev->stats.tx_bytes += skb->len; | |
368 | } | |
f266a683 | 369 | |
05ca6e64 | 370 | if (frame.skb_hsr) |
f266a683 | 371 | kfree_skb(frame.skb_hsr); |
05ca6e64 | 372 | if (frame.skb_std) |
f266a683 AB |
373 | kfree_skb(frame.skb_std); |
374 | return; | |
375 | ||
376 | out_drop: | |
377 | port->dev->stats.tx_dropped++; | |
378 | kfree_skb(skb); | |
379 | } |