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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/net/ethernet/eth.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * INET		An implementation of the TCP/IP protocol suite for the LINUX
34  *		operating system.  INET is implemented using the  BSD Socket
....@@ -31,11 +32,6 @@
3132  *				  older network drivers and IFF_ALLMULTI.
3233  *	Christer Weinigel	: Better rebuild header message.
3334  *             Andrew Morton    : 26Feb01: kill ether_setup() - use netdev_boot_setup().
34
- *
35
- *		This program is free software; you can redistribute it and/or
36
- *		modify it under the terms of the GNU General Public License
37
- *		as published by the Free Software Foundation; either version
38
- *		2 of the License, or (at your option) any later version.
3935  */
4036 #include <linux/module.h>
4137 #include <linux/types.h>
....@@ -47,6 +43,7 @@
4743 #include <linux/inet.h>
4844 #include <linux/ip.h>
4945 #include <linux/netdevice.h>
46
+#include <linux/nvmem-consumer.h>
5047 #include <linux/etherdevice.h>
5148 #include <linux/skbuff.h>
5249 #include <linux/errno.h>
....@@ -118,13 +115,14 @@
118115 
119116 /**
120117  * eth_get_headlen - determine the length of header for an ethernet frame
118
+ * @dev: pointer to network device
121119  * @data: pointer to start of frame
122120  * @len: total length of frame
123121  *
124122  * Make a best effort attempt to pull the length for all of the headers for
125123  * a given frame in a linear buffer.
126124  */
127
-u32 eth_get_headlen(void *data, unsigned int len)
125
+u32 eth_get_headlen(const struct net_device *dev, void *data, unsigned int len)
128126 {
129127 	const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG;
130128 	const struct ethhdr *eth = (const struct ethhdr *)data;
....@@ -135,8 +133,9 @@
135133 		return len;
136134 
137135 	/* parse any remaining L2/L3 headers, check for L4 */
138
-	if (!skb_flow_dissect_flow_keys_basic(NULL, &keys, data, eth->h_proto,
139
-					      sizeof(*eth), len, flags))
136
+	if (!skb_flow_dissect_flow_keys_basic(dev_net(dev), NULL, &keys, data,
137
+					      eth->h_proto, sizeof(*eth),
138
+					      len, flags))
140139 		return max_t(u32, keys.control.thoff, sizeof(*eth));
141140 
142141 	/* parse for any L4 headers */
....@@ -165,23 +164,29 @@
165164 	eth = (struct ethhdr *)skb->data;
166165 	skb_pull_inline(skb, ETH_HLEN);
167166 
168
-	if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
169
-		if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
170
-			skb->pkt_type = PACKET_BROADCAST;
171
-		else
172
-			skb->pkt_type = PACKET_MULTICAST;
167
+	if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
168
+					      dev->dev_addr))) {
169
+		if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
170
+			if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
171
+				skb->pkt_type = PACKET_BROADCAST;
172
+			else
173
+				skb->pkt_type = PACKET_MULTICAST;
174
+		} else {
175
+			skb->pkt_type = PACKET_OTHERHOST;
176
+		}
173177 	}
174
-	else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
175
-						   dev->dev_addr)))
176
-		skb->pkt_type = PACKET_OTHERHOST;
177178 
178179 	/*
179180 	 * Some variants of DSA tagging don't have an ethertype field
180181 	 * at all, so we check here whether one of those tagging
181182 	 * variants has been configured on the receiving interface,
182183 	 * and if so, set skb->protocol without looking at the packet.
184
+	 * The DSA tagging protocol may be able to decode some but not all
185
+	 * traffic (for example only for management). In that case give it the
186
+	 * option to filter the packets from which it can decode source port
187
+	 * information.
183188 	 */
184
-	if (unlikely(netdev_uses_dsa(dev)))
189
+	if (unlikely(netdev_uses_dsa(dev)) && dsa_can_decode(skb, dev))
185190 		return htons(ETH_P_XDSA);
186191 
187192 	if (likely(eth_proto_is_802_3(eth->h_proto)))
....@@ -267,6 +272,18 @@
267272 EXPORT_SYMBOL(eth_header_cache_update);
268273 
269274 /**
275
+ * eth_header_parser_protocol - extract protocol from L2 header
276
+ * @skb: packet to extract protocol from
277
+ */
278
+__be16 eth_header_parse_protocol(const struct sk_buff *skb)
279
+{
280
+	const struct ethhdr *eth = eth_hdr(skb);
281
+
282
+	return eth->h_proto;
283
+}
284
+EXPORT_SYMBOL(eth_header_parse_protocol);
285
+
286
+/**
270287  * eth_prepare_mac_addr_change - prepare for mac change
271288  * @dev: network device
272289  * @p: socket address
....@@ -318,22 +335,6 @@
318335 }
319336 EXPORT_SYMBOL(eth_mac_addr);
320337 
321
-/**
322
- * eth_change_mtu - set new MTU size
323
- * @dev: network device
324
- * @new_mtu: new Maximum Transfer Unit
325
- *
326
- * Allow changing MTU size. Needs to be overridden for devices
327
- * supporting jumbo frames.
328
- */
329
-int eth_change_mtu(struct net_device *dev, int new_mtu)
330
-{
331
-	netdev_warn(dev, "%s is deprecated\n", __func__);
332
-	dev->mtu = new_mtu;
333
-	return 0;
334
-}
335
-EXPORT_SYMBOL(eth_change_mtu);
336
-
337338 int eth_validate_addr(struct net_device *dev)
338339 {
339340 	if (!is_valid_ether_addr(dev->dev_addr))
....@@ -348,6 +349,7 @@
348349 	.parse		= eth_header_parse,
349350 	.cache		= eth_header_cache,
350351 	.cache_update	= eth_header_cache_update,
352
+	.parse_protocol	= eth_header_parse_protocol,
351353 };
352354 
353355 /**
....@@ -397,34 +399,6 @@
397399 				ether_setup, txqs, rxqs);
398400 }
399401 EXPORT_SYMBOL(alloc_etherdev_mqs);
400
-
401
-static void devm_free_netdev(struct device *dev, void *res)
402
-{
403
-	free_netdev(*(struct net_device **)res);
404
-}
405
-
406
-struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
407
-					   unsigned int txqs, unsigned int rxqs)
408
-{
409
-	struct net_device **dr;
410
-	struct net_device *netdev;
411
-
412
-	dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL);
413
-	if (!dr)
414
-		return NULL;
415
-
416
-	netdev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs);
417
-	if (!netdev) {
418
-		devres_free(dr);
419
-		return NULL;
420
-	}
421
-
422
-	*dr = netdev;
423
-	devres_add(dev, dr);
424
-
425
-	return netdev;
426
-}
427
-EXPORT_SYMBOL(devm_alloc_etherdev_mqs);
428402 
429403 ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
430404 {
....@@ -532,24 +506,55 @@
532506 
533507 int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
534508 {
535
-	const unsigned char *addr;
536
-	struct device_node *dp;
509
+	const unsigned char *addr = NULL;
537510 
538
-	if (dev_is_pci(dev))
539
-		dp = pci_device_to_OF_node(to_pci_dev(dev));
540
-	else
541
-		dp = dev->of_node;
542
-
543
-	addr = NULL;
544
-	if (dp)
545
-		addr = of_get_mac_address(dp);
546
-	if (!addr)
511
+	if (dev->of_node)
512
+		addr = of_get_mac_address(dev->of_node);
513
+	if (IS_ERR_OR_NULL(addr))
547514 		addr = arch_get_platform_mac_address();
548515 
549516 	if (!addr)
550517 		return -ENODEV;
551518 
552519 	ether_addr_copy(mac_addr, addr);
520
+
553521 	return 0;
554522 }
555523 EXPORT_SYMBOL(eth_platform_get_mac_address);
524
+
525
+/**
526
+ * Obtain the MAC address from an nvmem cell named 'mac-address' associated
527
+ * with given device.
528
+ *
529
+ * @dev:	Device with which the mac-address cell is associated.
530
+ * @addrbuf:	Buffer to which the MAC address will be copied on success.
531
+ *
532
+ * Returns 0 on success or a negative error number on failure.
533
+ */
534
+int nvmem_get_mac_address(struct device *dev, void *addrbuf)
535
+{
536
+	struct nvmem_cell *cell;
537
+	const void *mac;
538
+	size_t len;
539
+
540
+	cell = nvmem_cell_get(dev, "mac-address");
541
+	if (IS_ERR(cell))
542
+		return PTR_ERR(cell);
543
+
544
+	mac = nvmem_cell_read(cell, &len);
545
+	nvmem_cell_put(cell);
546
+
547
+	if (IS_ERR(mac))
548
+		return PTR_ERR(mac);
549
+
550
+	if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
551
+		kfree(mac);
552
+		return -EINVAL;
553
+	}
554
+
555
+	ether_addr_copy(addrbuf, mac);
556
+	kfree(mac);
557
+
558
+	return 0;
559
+}
560
+EXPORT_SYMBOL(nvmem_get_mac_address);