12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 41da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 51da177e4SLinus Torvalds * interface as the means of communication with the user level. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Ethernet-type device handling. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Version: @(#)eth.c 1.0.7 05/25/93 101da177e4SLinus Torvalds * 1102c30a84SJesper Juhl * Authors: Ross Biro 121da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 131da177e4SLinus Torvalds * Mark Evans, <evansmp@uhura.aston.ac.uk> 141da177e4SLinus Torvalds * Florian La Roche, <rzsfl@rz.uni-sb.de> 151da177e4SLinus Torvalds * Alan Cox, <gw4pts@gw4pts.ampr.org> 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * Fixes: 181da177e4SLinus Torvalds * Mr Linux : Arp problems 191da177e4SLinus Torvalds * Alan Cox : Generic queue tidyup (very tiny here) 201da177e4SLinus Torvalds * Alan Cox : eth_header ntohs should be htons 211da177e4SLinus Torvalds * Alan Cox : eth_rebuild_header missing an htons and 221da177e4SLinus Torvalds * minor other things. 231da177e4SLinus Torvalds * Tegge : Arp bug fixes. 241da177e4SLinus Torvalds * Florian : Removed many unnecessary functions, code cleanup 251da177e4SLinus Torvalds * and changes for new arp and skbuff. 261da177e4SLinus Torvalds * Alan Cox : Redid header building to reflect new format. 271da177e4SLinus Torvalds * Alan Cox : ARP only when compiled with CONFIG_INET 281da177e4SLinus Torvalds * Greg Page : 802.2 and SNAP stuff. 291da177e4SLinus Torvalds * Alan Cox : MAC layer pointers/new format. 301da177e4SLinus Torvalds * Paul Gortmaker : eth_copy_and_sum shouldn't csum padding. 311da177e4SLinus Torvalds * Alan Cox : Protect against forwarding explosions with 321da177e4SLinus Torvalds * older network drivers and IFF_ALLMULTI. 331da177e4SLinus Torvalds * Christer Weinigel : Better rebuild header message. 341da177e4SLinus Torvalds * Andrew Morton : 26Feb01: kill ether_setup() - use netdev_boot_setup(). 351da177e4SLinus Torvalds */ 361da177e4SLinus Torvalds #include <linux/module.h> 371da177e4SLinus Torvalds #include <linux/types.h> 381da177e4SLinus Torvalds #include <linux/kernel.h> 391da177e4SLinus Torvalds #include <linux/string.h> 401da177e4SLinus Torvalds #include <linux/mm.h> 411da177e4SLinus Torvalds #include <linux/socket.h> 421da177e4SLinus Torvalds #include <linux/in.h> 431da177e4SLinus Torvalds #include <linux/inet.h> 441da177e4SLinus Torvalds #include <linux/ip.h> 451da177e4SLinus Torvalds #include <linux/netdevice.h> 460e839df9SBartosz Golaszewski #include <linux/nvmem-consumer.h> 471da177e4SLinus Torvalds #include <linux/etherdevice.h> 481da177e4SLinus Torvalds #include <linux/skbuff.h> 491da177e4SLinus Torvalds #include <linux/errno.h> 501da177e4SLinus Torvalds #include <linux/init.h> 5146f25dffSKris Katterjohn #include <linux/if_ether.h> 52c7f5d105SDavid S. Miller #include <linux/of_net.h> 53c7f5d105SDavid S. Miller #include <linux/pci.h> 54433baf07SJakub Kicinski #include <linux/property.h> 551da177e4SLinus Torvalds #include <net/dst.h> 561da177e4SLinus Torvalds #include <net/arp.h> 571da177e4SLinus Torvalds #include <net/sock.h> 581da177e4SLinus Torvalds #include <net/ipv6.h> 591da177e4SLinus Torvalds #include <net/ip.h> 60cf85d08fSLennert Buytenhek #include <net/dsa.h> 6110b89ee4SJiri Pirko #include <net/flow_dissector.h> 625588796eSAlexander Lobakin #include <net/gro.h> 63118a7b0eSAvinash Kumar #include <linux/uaccess.h> 64d0a81f67SJesper Dangaard Brouer #include <net/pkt_sched.h> 651da177e4SLinus Torvalds 66d3e01f71SStephen Hemminger /** 67d3e01f71SStephen Hemminger * eth_header - create the Ethernet header 68d3e01f71SStephen Hemminger * @skb: buffer to alter 69d3e01f71SStephen Hemminger * @dev: source device 70d3e01f71SStephen Hemminger * @type: Ethernet type field 71d3e01f71SStephen Hemminger * @daddr: destination address (NULL leave destination address) 72d3e01f71SStephen Hemminger * @saddr: source address (NULL use device source address) 73d3e01f71SStephen Hemminger * @len: packet length (<= skb->len) 741da177e4SLinus Torvalds * 75d3e01f71SStephen Hemminger * 76bf9ae538SOctavian Purdila * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length 77bf9ae538SOctavian Purdila * in here instead. 781da177e4SLinus Torvalds */ 793b04dddeSStephen Hemminger int eth_header(struct sk_buff *skb, struct net_device *dev, 803b04dddeSStephen Hemminger unsigned short type, 8195c96174SEric Dumazet const void *daddr, const void *saddr, unsigned int len) 821da177e4SLinus Torvalds { 83d58ff351SJohannes Berg struct ethhdr *eth = skb_push(skb, ETH_HLEN); 841da177e4SLinus Torvalds 85bf9ae538SOctavian Purdila if (type != ETH_P_802_3 && type != ETH_P_802_2) 861da177e4SLinus Torvalds eth->h_proto = htons(type); 871da177e4SLinus Torvalds else 881da177e4SLinus Torvalds eth->h_proto = htons(len); 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* 911da177e4SLinus Torvalds * Set the source hardware address. 921da177e4SLinus Torvalds */ 931da177e4SLinus Torvalds 94ff593c59SDenis Vlasenko if (!saddr) 95ff593c59SDenis Vlasenko saddr = dev->dev_addr; 9623f1f4efSStephen Hemminger memcpy(eth->h_source, saddr, ETH_ALEN); 971da177e4SLinus Torvalds 982e4ca75bSStephen Hemminger if (daddr) { 9923f1f4efSStephen Hemminger memcpy(eth->h_dest, daddr, ETH_ALEN); 100f8d0e3f1SJamal Hadi Salim return ETH_HLEN; 101f8d0e3f1SJamal Hadi Salim } 102f8d0e3f1SJamal Hadi Salim 1031da177e4SLinus Torvalds /* 1041da177e4SLinus Torvalds * Anyway, the loopback-device should never use this function... 1051da177e4SLinus Torvalds */ 1061da177e4SLinus Torvalds 1072e4ca75bSStephen Hemminger if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { 108afc130ddSJoe Perches eth_zero_addr(eth->h_dest); 1091da177e4SLinus Torvalds return ETH_HLEN; 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds return -ETH_HLEN; 1131da177e4SLinus Torvalds } 1143b04dddeSStephen Hemminger EXPORT_SYMBOL(eth_header); 1151da177e4SLinus Torvalds 116d3e01f71SStephen Hemminger /** 117ecea4991SMasanari Iida * eth_get_headlen - determine the length of header for an ethernet frame 118c43f1255SStanislav Fomichev * @dev: pointer to network device 11956193d1bSAlexander Duyck * @data: pointer to start of frame 12056193d1bSAlexander Duyck * @len: total length of frame 12156193d1bSAlexander Duyck * 12256193d1bSAlexander Duyck * Make a best effort attempt to pull the length for all of the headers for 12356193d1bSAlexander Duyck * a given frame in a linear buffer. 12456193d1bSAlexander Duyck */ 12559753ce8SAlexander Lobakin u32 eth_get_headlen(const struct net_device *dev, const void *data, u32 len) 12656193d1bSAlexander Duyck { 127d975ddd6SAlexander Duyck const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG; 12856193d1bSAlexander Duyck const struct ethhdr *eth = (const struct ethhdr *)data; 12972a338bcSPaolo Abeni struct flow_keys_basic keys; 13056193d1bSAlexander Duyck 13156193d1bSAlexander Duyck /* this should never happen, but better safe than sorry */ 1328a4683a5SJesper Dangaard Brouer if (unlikely(len < sizeof(*eth))) 13356193d1bSAlexander Duyck return len; 13456193d1bSAlexander Duyck 13556193d1bSAlexander Duyck /* parse any remaining L2/L3 headers, check for L4 */ 136c43f1255SStanislav Fomichev if (!skb_flow_dissect_flow_keys_basic(dev_net(dev), NULL, &keys, data, 1373cbf4ffbSStanislav Fomichev eth->h_proto, sizeof(*eth), 1383cbf4ffbSStanislav Fomichev len, flags)) 139c3f83241STom Herbert return max_t(u32, keys.control.thoff, sizeof(*eth)); 14056193d1bSAlexander Duyck 14156193d1bSAlexander Duyck /* parse for any L4 headers */ 14256193d1bSAlexander Duyck return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len); 14356193d1bSAlexander Duyck } 14456193d1bSAlexander Duyck EXPORT_SYMBOL(eth_get_headlen); 14556193d1bSAlexander Duyck 14656193d1bSAlexander Duyck /** 147d3e01f71SStephen Hemminger * eth_type_trans - determine the packet's protocol ID. 148d3e01f71SStephen Hemminger * @skb: received socket data 149d3e01f71SStephen Hemminger * @dev: receiving network device 150d3e01f71SStephen Hemminger * 151d3e01f71SStephen Hemminger * The rule here is that we 1521da177e4SLinus Torvalds * assume 802.3 if the type field is short enough to be a length. 1531da177e4SLinus Torvalds * This is normal practice and works for any 'now in use' protocol. 1541da177e4SLinus Torvalds */ 155ab611487SAlexey Dobriyan __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) 1561da177e4SLinus Torvalds { 1570864c158SEric Dumazet unsigned short _service_access_point; 1580864c158SEric Dumazet const unsigned short *sap; 1590864c158SEric Dumazet const struct ethhdr *eth; 1601da177e4SLinus Torvalds 1614c13eb66SArnaldo Carvalho de Melo skb->dev = dev; 162459a98edSArnaldo Carvalho de Melo skb_reset_mac_header(skb); 163610986e7SAlexander Duyck 164*3998d184SDaniel Borkmann eth = eth_skb_pull_mac(skb); 1656e159fd6SRahul Rameshbabu eth_skb_pkt_type(skb, dev); 1661da177e4SLinus Torvalds 167cf85d08fSLennert Buytenhek /* 168cf85d08fSLennert Buytenhek * Some variants of DSA tagging don't have an ethertype field 169cf85d08fSLennert Buytenhek * at all, so we check here whether one of those tagging 170cf85d08fSLennert Buytenhek * variants has been configured on the receiving interface, 171cf85d08fSLennert Buytenhek * and if so, set skb->protocol without looking at the packet. 172cf85d08fSLennert Buytenhek */ 173edac6f63SVladimir Oltean if (unlikely(netdev_uses_dsa(dev))) 1743e8a72d1SFlorian Fainelli return htons(ETH_P_XDSA); 175cf85d08fSLennert Buytenhek 1762c7a88c2SAlexander Duyck if (likely(eth_proto_is_802_3(eth->h_proto))) 1771da177e4SLinus Torvalds return eth->h_proto; 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds /* 1801da177e4SLinus Torvalds * This is a magic hack to spot IPX packets. Older Novell breaks 1811da177e4SLinus Torvalds * the protocol design and runs IPX over 802.3 without an 802.2 LLC 1821da177e4SLinus Torvalds * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This 1831da177e4SLinus Torvalds * won't work for fault tolerant netware but does for the rest. 1841da177e4SLinus Torvalds */ 1850864c158SEric Dumazet sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point); 1860864c158SEric Dumazet if (sap && *sap == 0xFFFF) 1871da177e4SLinus Torvalds return htons(ETH_P_802_3); 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* 1901da177e4SLinus Torvalds * Real 802.2 LLC 1911da177e4SLinus Torvalds */ 1921da177e4SLinus Torvalds return htons(ETH_P_802_2); 1931da177e4SLinus Torvalds } 1942e4ca75bSStephen Hemminger EXPORT_SYMBOL(eth_type_trans); 1951da177e4SLinus Torvalds 196d3e01f71SStephen Hemminger /** 197d3e01f71SStephen Hemminger * eth_header_parse - extract hardware address from packet 198d3e01f71SStephen Hemminger * @skb: packet to extract header from 199d3e01f71SStephen Hemminger * @haddr: destination buffer 200d3e01f71SStephen Hemminger */ 2013b04dddeSStephen Hemminger int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr) 2021da177e4SLinus Torvalds { 203b95cce35SStephen Hemminger const struct ethhdr *eth = eth_hdr(skb); 2041da177e4SLinus Torvalds memcpy(haddr, eth->h_source, ETH_ALEN); 2051da177e4SLinus Torvalds return ETH_ALEN; 2061da177e4SLinus Torvalds } 2073b04dddeSStephen Hemminger EXPORT_SYMBOL(eth_header_parse); 2081da177e4SLinus Torvalds 209d3e01f71SStephen Hemminger /** 210d3e01f71SStephen Hemminger * eth_header_cache - fill cache entry from neighbour 211d3e01f71SStephen Hemminger * @neigh: source neighbour 212d3e01f71SStephen Hemminger * @hh: destination cache entry 21348daec03SRandy Dunlap * @type: Ethernet type field 2142c53040fSBen Hutchings * 215d3e01f71SStephen Hemminger * Create an Ethernet header template from the neighbour. 216d3e01f71SStephen Hemminger */ 217e69dd336SDavid S. Miller int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type) 2181da177e4SLinus Torvalds { 2191da177e4SLinus Torvalds struct ethhdr *eth; 2203b04dddeSStephen Hemminger const struct net_device *dev = neigh->dev; 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds eth = (struct ethhdr *) 2231da177e4SLinus Torvalds (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); 2241da177e4SLinus Torvalds 225f576e24fSYOSHIFUJI Hideaki if (type == htons(ETH_P_802_3)) 2261da177e4SLinus Torvalds return -1; 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds eth->h_proto = type; 22923f1f4efSStephen Hemminger memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); 23023f1f4efSStephen Hemminger memcpy(eth->h_dest, neigh->ha, ETH_ALEN); 231c305c6aeSEric Dumazet 232c305c6aeSEric Dumazet /* Pairs with READ_ONCE() in neigh_resolve_output(), 233c305c6aeSEric Dumazet * neigh_hh_output() and neigh_update_hhs(). 234c305c6aeSEric Dumazet */ 235c305c6aeSEric Dumazet smp_store_release(&hh->hh_len, ETH_HLEN); 236c305c6aeSEric Dumazet 2371da177e4SLinus Torvalds return 0; 2381da177e4SLinus Torvalds } 2393b04dddeSStephen Hemminger EXPORT_SYMBOL(eth_header_cache); 2401da177e4SLinus Torvalds 241d3e01f71SStephen Hemminger /** 242d3e01f71SStephen Hemminger * eth_header_cache_update - update cache entry 243d3e01f71SStephen Hemminger * @hh: destination cache entry 244d3e01f71SStephen Hemminger * @dev: network device 245d3e01f71SStephen Hemminger * @haddr: new hardware address 246d3e01f71SStephen Hemminger * 2471da177e4SLinus Torvalds * Called by Address Resolution module to notify changes in address. 2481da177e4SLinus Torvalds */ 2493b04dddeSStephen Hemminger void eth_header_cache_update(struct hh_cache *hh, 2503b04dddeSStephen Hemminger const struct net_device *dev, 2513b04dddeSStephen Hemminger const unsigned char *haddr) 2521da177e4SLinus Torvalds { 2531da177e4SLinus Torvalds memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), 25423f1f4efSStephen Hemminger haddr, ETH_ALEN); 2551da177e4SLinus Torvalds } 2563b04dddeSStephen Hemminger EXPORT_SYMBOL(eth_header_cache_update); 2571da177e4SLinus Torvalds 258d3e01f71SStephen Hemminger /** 259c1639be9SMauro Carvalho Chehab * eth_header_parse_protocol - extract protocol from L2 header 260ace53b2eSMaxim Mikityanskiy * @skb: packet to extract protocol from 261ace53b2eSMaxim Mikityanskiy */ 262ace53b2eSMaxim Mikityanskiy __be16 eth_header_parse_protocol(const struct sk_buff *skb) 263ace53b2eSMaxim Mikityanskiy { 264ace53b2eSMaxim Mikityanskiy const struct ethhdr *eth = eth_hdr(skb); 265ace53b2eSMaxim Mikityanskiy 266ace53b2eSMaxim Mikityanskiy return eth->h_proto; 267ace53b2eSMaxim Mikityanskiy } 268ace53b2eSMaxim Mikityanskiy EXPORT_SYMBOL(eth_header_parse_protocol); 269ace53b2eSMaxim Mikityanskiy 270ace53b2eSMaxim Mikityanskiy /** 271fa0879e3SStefan Hajnoczi * eth_prepare_mac_addr_change - prepare for mac change 272fa0879e3SStefan Hajnoczi * @dev: network device 273fa0879e3SStefan Hajnoczi * @p: socket address 274fa0879e3SStefan Hajnoczi */ 275fa0879e3SStefan Hajnoczi int eth_prepare_mac_addr_change(struct net_device *dev, void *p) 276fa0879e3SStefan Hajnoczi { 277fa0879e3SStefan Hajnoczi struct sockaddr *addr = p; 278fa0879e3SStefan Hajnoczi 279fa0879e3SStefan Hajnoczi if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) 280fa0879e3SStefan Hajnoczi return -EBUSY; 281fa0879e3SStefan Hajnoczi if (!is_valid_ether_addr(addr->sa_data)) 282fa0879e3SStefan Hajnoczi return -EADDRNOTAVAIL; 283fa0879e3SStefan Hajnoczi return 0; 284fa0879e3SStefan Hajnoczi } 285fa0879e3SStefan Hajnoczi EXPORT_SYMBOL(eth_prepare_mac_addr_change); 286fa0879e3SStefan Hajnoczi 287fa0879e3SStefan Hajnoczi /** 288fa0879e3SStefan Hajnoczi * eth_commit_mac_addr_change - commit mac change 289fa0879e3SStefan Hajnoczi * @dev: network device 290fa0879e3SStefan Hajnoczi * @p: socket address 291fa0879e3SStefan Hajnoczi */ 292fa0879e3SStefan Hajnoczi void eth_commit_mac_addr_change(struct net_device *dev, void *p) 293fa0879e3SStefan Hajnoczi { 294fa0879e3SStefan Hajnoczi struct sockaddr *addr = p; 295fa0879e3SStefan Hajnoczi 296a96d317fSJakub Kicinski eth_hw_addr_set(dev, addr->sa_data); 297fa0879e3SStefan Hajnoczi } 298fa0879e3SStefan Hajnoczi EXPORT_SYMBOL(eth_commit_mac_addr_change); 299fa0879e3SStefan Hajnoczi 300fa0879e3SStefan Hajnoczi /** 301d3e01f71SStephen Hemminger * eth_mac_addr - set new Ethernet hardware address 302d3e01f71SStephen Hemminger * @dev: network device 303d3e01f71SStephen Hemminger * @p: socket address 3042c53040fSBen Hutchings * 305d3e01f71SStephen Hemminger * Change hardware address of device. 306d3e01f71SStephen Hemminger * 307d3e01f71SStephen Hemminger * This doesn't change hardware matching, so needs to be overridden 308d3e01f71SStephen Hemminger * for most real devices. 309d3e01f71SStephen Hemminger */ 310ccad637bSStephen Hemminger int eth_mac_addr(struct net_device *dev, void *p) 3111da177e4SLinus Torvalds { 312fa0879e3SStefan Hajnoczi int ret; 31371bffe55SPatrick McHardy 314fa0879e3SStefan Hajnoczi ret = eth_prepare_mac_addr_change(dev, p); 315fa0879e3SStefan Hajnoczi if (ret < 0) 316fa0879e3SStefan Hajnoczi return ret; 317fa0879e3SStefan Hajnoczi eth_commit_mac_addr_change(dev, p); 3181da177e4SLinus Torvalds return 0; 3191da177e4SLinus Torvalds } 320ccad637bSStephen Hemminger EXPORT_SYMBOL(eth_mac_addr); 3211da177e4SLinus Torvalds 322ccad637bSStephen Hemminger int eth_validate_addr(struct net_device *dev) 323bada339bSJeff Garzik { 324bada339bSJeff Garzik if (!is_valid_ether_addr(dev->dev_addr)) 3252ed9926eSPatrick McHardy return -EADDRNOTAVAIL; 326bada339bSJeff Garzik 327bada339bSJeff Garzik return 0; 328bada339bSJeff Garzik } 329ccad637bSStephen Hemminger EXPORT_SYMBOL(eth_validate_addr); 330bada339bSJeff Garzik 3313b04dddeSStephen Hemminger const struct header_ops eth_header_ops ____cacheline_aligned = { 3323b04dddeSStephen Hemminger .create = eth_header, 3333b04dddeSStephen Hemminger .parse = eth_header_parse, 3343b04dddeSStephen Hemminger .cache = eth_header_cache, 3353b04dddeSStephen Hemminger .cache_update = eth_header_cache_update, 336ace53b2eSMaxim Mikityanskiy .parse_protocol = eth_header_parse_protocol, 3373b04dddeSStephen Hemminger }; 3383b04dddeSStephen Hemminger 339d3e01f71SStephen Hemminger /** 340d3e01f71SStephen Hemminger * ether_setup - setup Ethernet network device 341d3e01f71SStephen Hemminger * @dev: network device 3422c53040fSBen Hutchings * 343d3e01f71SStephen Hemminger * Fill in the fields of the device structure with Ethernet-generic values. 3441da177e4SLinus Torvalds */ 3451da177e4SLinus Torvalds void ether_setup(struct net_device *dev) 3461da177e4SLinus Torvalds { 3473b04dddeSStephen Hemminger dev->header_ops = ð_header_ops; 3481da177e4SLinus Torvalds dev->type = ARPHRD_ETHER; 3491da177e4SLinus Torvalds dev->hard_header_len = ETH_HLEN; 350217e6fa2SWillem de Bruijn dev->min_header_len = ETH_HLEN; 35146f25dffSKris Katterjohn dev->mtu = ETH_DATA_LEN; 352a52ad514SJarod Wilson dev->min_mtu = ETH_MIN_MTU; 353a52ad514SJarod Wilson dev->max_mtu = ETH_DATA_LEN; 3541da177e4SLinus Torvalds dev->addr_len = ETH_ALEN; 355d0a81f67SJesper Dangaard Brouer dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; 3561da177e4SLinus Torvalds dev->flags = IFF_BROADCAST|IFF_MULTICAST; 35731dda0aeSnhorman dev->priv_flags |= IFF_TX_SKB_SHARING; 3581da177e4SLinus Torvalds 359afc130ddSJoe Perches eth_broadcast_addr(dev->broadcast); 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds } 3621da177e4SLinus Torvalds EXPORT_SYMBOL(ether_setup); 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds /** 36536909ea4STom Herbert * alloc_etherdev_mqs - Allocates and sets up an Ethernet device 3661da177e4SLinus Torvalds * @sizeof_priv: Size of additional driver-private structure to be allocated 367d3e01f71SStephen Hemminger * for this Ethernet device 36836909ea4STom Herbert * @txqs: The number of TX queues this device has. 3693806b4f3SRandy Dunlap * @rxqs: The number of RX queues this device has. 3701da177e4SLinus Torvalds * 371d3e01f71SStephen Hemminger * Fill in the fields of the device structure with Ethernet-generic 3721da177e4SLinus Torvalds * values. Basically does everything except registering the device. 3731da177e4SLinus Torvalds * 3741da177e4SLinus Torvalds * Constructs a new net device, complete with a private data area of 375d3e01f71SStephen Hemminger * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for 3761da177e4SLinus Torvalds * this private data area. 3771da177e4SLinus Torvalds */ 3781da177e4SLinus Torvalds 37936909ea4STom Herbert struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, 38036909ea4STom Herbert unsigned int rxqs) 3811da177e4SLinus Torvalds { 382e9f656b7SIan Wienand return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_ENUM, 383c835a677STom Gundersen ether_setup, txqs, rxqs); 3841da177e4SLinus Torvalds } 38536909ea4STom Herbert EXPORT_SYMBOL(alloc_etherdev_mqs); 3860795af57SJoe Perches 3877ffc49a6SMichael Chan ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len) 3887ffc49a6SMichael Chan { 38916dc16d9Sye xingchen return sysfs_emit(buf, "%*phC\n", len, addr); 3907ffc49a6SMichael Chan } 3917ffc49a6SMichael Chan EXPORT_SYMBOL(sysfs_format_mac); 3929b174d88SJesse Gross 393d4546c25SDavid Miller struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb) 3949b174d88SJesse Gross { 3959b174d88SJesse Gross const struct packet_offload *ptype; 396d4546c25SDavid Miller unsigned int hlen, off_eth; 397d4546c25SDavid Miller struct sk_buff *pp = NULL; 398d4546c25SDavid Miller struct ethhdr *eh, *eh2; 399d4546c25SDavid Miller struct sk_buff *p; 4009b174d88SJesse Gross __be16 type; 4019b174d88SJesse Gross int flush = 1; 4029b174d88SJesse Gross 4039b174d88SJesse Gross off_eth = skb_gro_offset(skb); 4049b174d88SJesse Gross hlen = off_eth + sizeof(*eh); 40535ffb665SRichard Gobert eh = skb_gro_header(skb, hlen, off_eth); 4069b174d88SJesse Gross if (unlikely(!eh)) 4079b174d88SJesse Gross goto out; 4089b174d88SJesse Gross 4099b174d88SJesse Gross flush = 0; 4109b174d88SJesse Gross 411d4546c25SDavid Miller list_for_each_entry(p, head, list) { 4129b174d88SJesse Gross if (!NAPI_GRO_CB(p)->same_flow) 4139b174d88SJesse Gross continue; 4149b174d88SJesse Gross 4159b174d88SJesse Gross eh2 = (struct ethhdr *)(p->data + off_eth); 4169b174d88SJesse Gross if (compare_ether_header(eh, eh2)) { 4179b174d88SJesse Gross NAPI_GRO_CB(p)->same_flow = 0; 4189b174d88SJesse Gross continue; 4199b174d88SJesse Gross } 4209b174d88SJesse Gross } 4219b174d88SJesse Gross 4229b174d88SJesse Gross type = eh->h_proto; 4239b174d88SJesse Gross 4249b174d88SJesse Gross ptype = gro_find_receive_by_type(type); 4259b174d88SJesse Gross if (ptype == NULL) { 4269b174d88SJesse Gross flush = 1; 427fc1ca334SEric Dumazet goto out; 4289b174d88SJesse Gross } 4299b174d88SJesse Gross 4309b174d88SJesse Gross skb_gro_pull(skb, sizeof(*eh)); 4319b174d88SJesse Gross skb_gro_postpull_rcsum(skb, eh, sizeof(*eh)); 4325588796eSAlexander Lobakin 4335588796eSAlexander Lobakin pp = indirect_call_gro_receive_inet(ptype->callbacks.gro_receive, 4345588796eSAlexander Lobakin ipv6_gro_receive, inet_gro_receive, 4355588796eSAlexander Lobakin head, skb); 4369b174d88SJesse Gross 4379b174d88SJesse Gross out: 4385f114163SSteffen Klassert skb_gro_flush_final(skb, pp, flush); 4399b174d88SJesse Gross 4409b174d88SJesse Gross return pp; 4419b174d88SJesse Gross } 4429b174d88SJesse Gross EXPORT_SYMBOL(eth_gro_receive); 4439b174d88SJesse Gross 4449b174d88SJesse Gross int eth_gro_complete(struct sk_buff *skb, int nhoff) 4459b174d88SJesse Gross { 4469b174d88SJesse Gross struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff); 4479b174d88SJesse Gross __be16 type = eh->h_proto; 4489b174d88SJesse Gross struct packet_offload *ptype; 4499b174d88SJesse Gross int err = -ENOSYS; 4509b174d88SJesse Gross 4519b174d88SJesse Gross if (skb->encapsulation) 4529b174d88SJesse Gross skb_set_inner_mac_header(skb, nhoff); 4539b174d88SJesse Gross 4549b174d88SJesse Gross ptype = gro_find_complete_by_type(type); 4559b174d88SJesse Gross if (ptype != NULL) 4565588796eSAlexander Lobakin err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete, 4575588796eSAlexander Lobakin ipv6_gro_complete, inet_gro_complete, 4585588796eSAlexander Lobakin skb, nhoff + sizeof(*eh)); 4599b174d88SJesse Gross 4609b174d88SJesse Gross return err; 4619b174d88SJesse Gross } 4629b174d88SJesse Gross EXPORT_SYMBOL(eth_gro_complete); 4639b174d88SJesse Gross 4649b174d88SJesse Gross static struct packet_offload eth_packet_offload __read_mostly = { 4659b174d88SJesse Gross .type = cpu_to_be16(ETH_P_TEB), 466bdef7de4SDavid S. Miller .priority = 10, 4679b174d88SJesse Gross .callbacks = { 4689b174d88SJesse Gross .gro_receive = eth_gro_receive, 4699b174d88SJesse Gross .gro_complete = eth_gro_complete, 4709b174d88SJesse Gross }, 4719b174d88SJesse Gross }; 4729b174d88SJesse Gross 4739b174d88SJesse Gross static int __init eth_offload_init(void) 4749b174d88SJesse Gross { 4759b174d88SJesse Gross dev_add_offload(ð_packet_offload); 4769b174d88SJesse Gross 4779b174d88SJesse Gross return 0; 4789b174d88SJesse Gross } 4799b174d88SJesse Gross 4809b174d88SJesse Gross fs_initcall(eth_offload_init); 481c7f5d105SDavid S. Miller 482c7f5d105SDavid S. Miller unsigned char * __weak arch_get_platform_mac_address(void) 483c7f5d105SDavid S. Miller { 484c7f5d105SDavid S. Miller return NULL; 485c7f5d105SDavid S. Miller } 486c7f5d105SDavid S. Miller 487c7f5d105SDavid S. Miller int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr) 488c7f5d105SDavid S. Miller { 48983216e39SMichael Walle unsigned char *addr; 49083216e39SMichael Walle int ret; 491c7f5d105SDavid S. Miller 49283216e39SMichael Walle ret = of_get_mac_address(dev->of_node, mac_addr); 49383216e39SMichael Walle if (!ret) 49483216e39SMichael Walle return 0; 49583216e39SMichael Walle 496c7f5d105SDavid S. Miller addr = arch_get_platform_mac_address(); 497c7f5d105SDavid S. Miller if (!addr) 498c7f5d105SDavid S. Miller return -ENODEV; 499c7f5d105SDavid S. Miller 500c7f5d105SDavid S. Miller ether_addr_copy(mac_addr, addr); 501db4bad07SHeiner Kallweit 502c7f5d105SDavid S. Miller return 0; 503c7f5d105SDavid S. Miller } 504c7f5d105SDavid S. Miller EXPORT_SYMBOL(eth_platform_get_mac_address); 5050e839df9SBartosz Golaszewski 5060e839df9SBartosz Golaszewski /** 507ba882580SJakub Kicinski * platform_get_ethdev_address - Set netdev's MAC address from a given device 508ba882580SJakub Kicinski * @dev: Pointer to the device 509ba882580SJakub Kicinski * @netdev: Pointer to netdev to write the address to 510ba882580SJakub Kicinski * 511ba882580SJakub Kicinski * Wrapper around eth_platform_get_mac_address() which writes the address 512ba882580SJakub Kicinski * directly to netdev->dev_addr. 513ba882580SJakub Kicinski */ 514ba882580SJakub Kicinski int platform_get_ethdev_address(struct device *dev, struct net_device *netdev) 515ba882580SJakub Kicinski { 516ba882580SJakub Kicinski u8 addr[ETH_ALEN] __aligned(2); 517ba882580SJakub Kicinski int ret; 518ba882580SJakub Kicinski 519ba882580SJakub Kicinski ret = eth_platform_get_mac_address(dev, addr); 520ba882580SJakub Kicinski if (!ret) 521ba882580SJakub Kicinski eth_hw_addr_set(netdev, addr); 522ba882580SJakub Kicinski return ret; 523ba882580SJakub Kicinski } 524ba882580SJakub Kicinski EXPORT_SYMBOL(platform_get_ethdev_address); 525ba882580SJakub Kicinski 526ba882580SJakub Kicinski /** 527c1639be9SMauro Carvalho Chehab * nvmem_get_mac_address - Obtain the MAC address from an nvmem cell named 528c1639be9SMauro Carvalho Chehab * 'mac-address' associated with given device. 5290e839df9SBartosz Golaszewski * 5300e839df9SBartosz Golaszewski * @dev: Device with which the mac-address cell is associated. 5310e839df9SBartosz Golaszewski * @addrbuf: Buffer to which the MAC address will be copied on success. 5320e839df9SBartosz Golaszewski * 5330e839df9SBartosz Golaszewski * Returns 0 on success or a negative error number on failure. 5340e839df9SBartosz Golaszewski */ 5350e839df9SBartosz Golaszewski int nvmem_get_mac_address(struct device *dev, void *addrbuf) 5360e839df9SBartosz Golaszewski { 5370e839df9SBartosz Golaszewski struct nvmem_cell *cell; 5380e839df9SBartosz Golaszewski const void *mac; 5390e839df9SBartosz Golaszewski size_t len; 5400e839df9SBartosz Golaszewski 5410e839df9SBartosz Golaszewski cell = nvmem_cell_get(dev, "mac-address"); 5420e839df9SBartosz Golaszewski if (IS_ERR(cell)) 5430e839df9SBartosz Golaszewski return PTR_ERR(cell); 5440e839df9SBartosz Golaszewski 5450e839df9SBartosz Golaszewski mac = nvmem_cell_read(cell, &len); 5460e839df9SBartosz Golaszewski nvmem_cell_put(cell); 5470e839df9SBartosz Golaszewski 5480e839df9SBartosz Golaszewski if (IS_ERR(mac)) 5490e839df9SBartosz Golaszewski return PTR_ERR(mac); 5500e839df9SBartosz Golaszewski 5510e839df9SBartosz Golaszewski if (len != ETH_ALEN || !is_valid_ether_addr(mac)) { 5520e839df9SBartosz Golaszewski kfree(mac); 5530e839df9SBartosz Golaszewski return -EINVAL; 5540e839df9SBartosz Golaszewski } 5550e839df9SBartosz Golaszewski 5560e839df9SBartosz Golaszewski ether_addr_copy(addrbuf, mac); 5570e839df9SBartosz Golaszewski kfree(mac); 5580e839df9SBartosz Golaszewski 5590e839df9SBartosz Golaszewski return 0; 5600e839df9SBartosz Golaszewski } 561433baf07SJakub Kicinski 5628017c4d8SJakub Kicinski static int fwnode_get_mac_addr(struct fwnode_handle *fwnode, 5630a14501eSJakub Kicinski const char *name, char *addr) 564433baf07SJakub Kicinski { 5658017c4d8SJakub Kicinski int ret; 566433baf07SJakub Kicinski 5670a14501eSJakub Kicinski ret = fwnode_property_read_u8_array(fwnode, name, addr, ETH_ALEN); 5688017c4d8SJakub Kicinski if (ret) 5698017c4d8SJakub Kicinski return ret; 5708017c4d8SJakub Kicinski 5718017c4d8SJakub Kicinski if (!is_valid_ether_addr(addr)) 5728017c4d8SJakub Kicinski return -EINVAL; 5738017c4d8SJakub Kicinski return 0; 574433baf07SJakub Kicinski } 575433baf07SJakub Kicinski 576433baf07SJakub Kicinski /** 577433baf07SJakub Kicinski * fwnode_get_mac_address - Get the MAC from the firmware node 578433baf07SJakub Kicinski * @fwnode: Pointer to the firmware node 579433baf07SJakub Kicinski * @addr: Address of buffer to store the MAC in 580433baf07SJakub Kicinski * 581433baf07SJakub Kicinski * Search the firmware node for the best MAC address to use. 'mac-address' is 582433baf07SJakub Kicinski * checked first, because that is supposed to contain to "most recent" MAC 583433baf07SJakub Kicinski * address. If that isn't set, then 'local-mac-address' is checked next, 584433baf07SJakub Kicinski * because that is the default address. If that isn't set, then the obsolete 585433baf07SJakub Kicinski * 'address' is checked, just in case we're using an old device tree. 586433baf07SJakub Kicinski * 587433baf07SJakub Kicinski * Note that the 'address' property is supposed to contain a virtual address of 588433baf07SJakub Kicinski * the register set, but some DTS files have redefined that property to be the 589433baf07SJakub Kicinski * MAC address. 590433baf07SJakub Kicinski * 591433baf07SJakub Kicinski * All-zero MAC addresses are rejected, because those could be properties that 592433baf07SJakub Kicinski * exist in the firmware tables, but were not updated by the firmware. For 593433baf07SJakub Kicinski * example, the DTS could define 'mac-address' and 'local-mac-address', with 594433baf07SJakub Kicinski * zero MAC addresses. Some older U-Boots only initialized 'local-mac-address'. 595433baf07SJakub Kicinski * In this case, the real MAC is in 'local-mac-address', and 'mac-address' 596433baf07SJakub Kicinski * exists but is all zeros. 597433baf07SJakub Kicinski */ 5980a14501eSJakub Kicinski int fwnode_get_mac_address(struct fwnode_handle *fwnode, char *addr) 599433baf07SJakub Kicinski { 6000a14501eSJakub Kicinski if (!fwnode_get_mac_addr(fwnode, "mac-address", addr) || 6010a14501eSJakub Kicinski !fwnode_get_mac_addr(fwnode, "local-mac-address", addr) || 6020a14501eSJakub Kicinski !fwnode_get_mac_addr(fwnode, "address", addr)) 6038017c4d8SJakub Kicinski return 0; 604433baf07SJakub Kicinski 6058017c4d8SJakub Kicinski return -ENOENT; 606433baf07SJakub Kicinski } 607433baf07SJakub Kicinski EXPORT_SYMBOL(fwnode_get_mac_address); 608433baf07SJakub Kicinski 609433baf07SJakub Kicinski /** 610433baf07SJakub Kicinski * device_get_mac_address - Get the MAC for a given device 611433baf07SJakub Kicinski * @dev: Pointer to the device 612433baf07SJakub Kicinski * @addr: Address of buffer to store the MAC in 613433baf07SJakub Kicinski */ 6140a14501eSJakub Kicinski int device_get_mac_address(struct device *dev, char *addr) 615433baf07SJakub Kicinski { 6160a14501eSJakub Kicinski return fwnode_get_mac_address(dev_fwnode(dev), addr); 617433baf07SJakub Kicinski } 618433baf07SJakub Kicinski EXPORT_SYMBOL(device_get_mac_address); 619d9eb4490SJakub Kicinski 620d9eb4490SJakub Kicinski /** 621d9eb4490SJakub Kicinski * device_get_ethdev_address - Set netdev's MAC address from a given device 622d9eb4490SJakub Kicinski * @dev: Pointer to the device 623d9eb4490SJakub Kicinski * @netdev: Pointer to netdev to write the address to 624d9eb4490SJakub Kicinski * 625d9eb4490SJakub Kicinski * Wrapper around device_get_mac_address() which writes the address 626d9eb4490SJakub Kicinski * directly to netdev->dev_addr. 627d9eb4490SJakub Kicinski */ 628d9eb4490SJakub Kicinski int device_get_ethdev_address(struct device *dev, struct net_device *netdev) 629d9eb4490SJakub Kicinski { 630d9eb4490SJakub Kicinski u8 addr[ETH_ALEN]; 631d9eb4490SJakub Kicinski int ret; 632d9eb4490SJakub Kicinski 633d9eb4490SJakub Kicinski ret = device_get_mac_address(dev, addr); 634d9eb4490SJakub Kicinski if (!ret) 635d9eb4490SJakub Kicinski eth_hw_addr_set(netdev, addr); 636d9eb4490SJakub Kicinski return ret; 637d9eb4490SJakub Kicinski } 638d9eb4490SJakub Kicinski EXPORT_SYMBOL(device_get_ethdev_address); 639