1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for the Interfaces handler. 7 * 8 * Version: @(#)dev.h 1.0.10 08/12/93 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <[email protected]> 12 * Corey Minyard <[email protected]> 13 * Donald J. Becker, <[email protected]> 14 * Alan Cox, <[email protected]> 15 * Bjorn Ekwall. <[email protected]> 16 * Pekka Riikonen <[email protected]> 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 * 23 * Moved to /usr/include/linux for NET3 24 */ 25 #ifndef _LINUX_NETDEVICE_H 26 #define _LINUX_NETDEVICE_H 27 28 #include <linux/if.h> 29 #include <linux/if_ether.h> 30 #include <linux/if_packet.h> 31 32 #ifdef __KERNEL__ 33 #include <linux/timer.h> 34 #include <asm/atomic.h> 35 #include <asm/cache.h> 36 #include <asm/byteorder.h> 37 38 #include <linux/device.h> 39 #include <linux/percpu.h> 40 #include <linux/dmaengine.h> 41 42 struct vlan_group; 43 struct ethtool_ops; 44 struct netpoll_info; 45 /* 802.11 specific */ 46 struct wireless_dev; 47 /* source back-compat hooks */ 48 #define SET_ETHTOOL_OPS(netdev,ops) \ 49 ( (netdev)->ethtool_ops = (ops) ) 50 51 #define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev 52 functions are available. */ 53 #define HAVE_FREE_NETDEV /* free_netdev() */ 54 #define HAVE_NETDEV_PRIV /* netdev_priv() */ 55 56 #define NET_XMIT_SUCCESS 0 57 #define NET_XMIT_DROP 1 /* skb dropped */ 58 #define NET_XMIT_CN 2 /* congestion notification */ 59 #define NET_XMIT_POLICED 3 /* skb is shot by police */ 60 #define NET_XMIT_BYPASS 4 /* packet does not leave via dequeue; 61 (TC use only - dev_queue_xmit 62 returns this as NET_XMIT_SUCCESS) */ 63 64 /* Backlog congestion levels */ 65 #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */ 66 #define NET_RX_DROP 1 /* packet dropped */ 67 #define NET_RX_CN_LOW 2 /* storm alert, just in case */ 68 #define NET_RX_CN_MOD 3 /* Storm on its way! */ 69 #define NET_RX_CN_HIGH 4 /* The storm is here */ 70 #define NET_RX_BAD 5 /* packet dropped due to kernel error */ 71 72 /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It 73 * indicates that the device will soon be dropping packets, or already drops 74 * some packets of the same priority; prompting us to send less aggressively. */ 75 #define net_xmit_eval(e) ((e) == NET_XMIT_CN? 0 : (e)) 76 #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0) 77 78 #endif 79 80 #define MAX_ADDR_LEN 32 /* Largest hardware address length */ 81 82 /* Driver transmit return codes */ 83 #define NETDEV_TX_OK 0 /* driver took care of packet */ 84 #define NETDEV_TX_BUSY 1 /* driver tx path was busy*/ 85 #define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */ 86 87 /* 88 * Compute the worst case header length according to the protocols 89 * used. 90 */ 91 92 #if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR) 93 #define LL_MAX_HEADER 32 94 #else 95 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 96 #define LL_MAX_HEADER 96 97 #else 98 #define LL_MAX_HEADER 48 99 #endif 100 #endif 101 102 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \ 103 !defined(CONFIG_NET_IPGRE) && !defined(CONFIG_NET_IPGRE_MODULE) && \ 104 !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \ 105 !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE) 106 #define MAX_HEADER LL_MAX_HEADER 107 #else 108 #define MAX_HEADER (LL_MAX_HEADER + 48) 109 #endif 110 111 struct net_device_subqueue 112 { 113 /* Give a control state for each queue. This struct may contain 114 * per-queue locks in the future. 115 */ 116 unsigned long state; 117 }; 118 119 /* 120 * Network device statistics. Akin to the 2.0 ether stats but 121 * with byte counters. 122 */ 123 124 struct net_device_stats 125 { 126 unsigned long rx_packets; /* total packets received */ 127 unsigned long tx_packets; /* total packets transmitted */ 128 unsigned long rx_bytes; /* total bytes received */ 129 unsigned long tx_bytes; /* total bytes transmitted */ 130 unsigned long rx_errors; /* bad packets received */ 131 unsigned long tx_errors; /* packet transmit problems */ 132 unsigned long rx_dropped; /* no space in linux buffers */ 133 unsigned long tx_dropped; /* no space available in linux */ 134 unsigned long multicast; /* multicast packets received */ 135 unsigned long collisions; 136 137 /* detailed rx_errors: */ 138 unsigned long rx_length_errors; 139 unsigned long rx_over_errors; /* receiver ring buff overflow */ 140 unsigned long rx_crc_errors; /* recved pkt with crc error */ 141 unsigned long rx_frame_errors; /* recv'd frame alignment error */ 142 unsigned long rx_fifo_errors; /* recv'r fifo overrun */ 143 unsigned long rx_missed_errors; /* receiver missed packet */ 144 145 /* detailed tx_errors */ 146 unsigned long tx_aborted_errors; 147 unsigned long tx_carrier_errors; 148 unsigned long tx_fifo_errors; 149 unsigned long tx_heartbeat_errors; 150 unsigned long tx_window_errors; 151 152 /* for cslip etc */ 153 unsigned long rx_compressed; 154 unsigned long tx_compressed; 155 }; 156 157 158 /* Media selection options. */ 159 enum { 160 IF_PORT_UNKNOWN = 0, 161 IF_PORT_10BASE2, 162 IF_PORT_10BASET, 163 IF_PORT_AUI, 164 IF_PORT_100BASET, 165 IF_PORT_100BASETX, 166 IF_PORT_100BASEFX 167 }; 168 169 #ifdef __KERNEL__ 170 171 #include <linux/cache.h> 172 #include <linux/skbuff.h> 173 174 struct neighbour; 175 struct neigh_parms; 176 struct sk_buff; 177 178 struct netif_rx_stats 179 { 180 unsigned total; 181 unsigned dropped; 182 unsigned time_squeeze; 183 unsigned cpu_collision; 184 }; 185 186 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat); 187 188 struct dev_addr_list 189 { 190 struct dev_addr_list *next; 191 u8 da_addr[MAX_ADDR_LEN]; 192 u8 da_addrlen; 193 u8 da_synced; 194 int da_users; 195 int da_gusers; 196 }; 197 198 /* 199 * We tag multicasts with these structures. 200 */ 201 202 #define dev_mc_list dev_addr_list 203 #define dmi_addr da_addr 204 #define dmi_addrlen da_addrlen 205 #define dmi_users da_users 206 #define dmi_gusers da_gusers 207 208 struct hh_cache 209 { 210 struct hh_cache *hh_next; /* Next entry */ 211 atomic_t hh_refcnt; /* number of users */ 212 /* 213 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate 214 * cache line on SMP. 215 * They are mostly read, but hh_refcnt may be changed quite frequently, 216 * incurring cache line ping pongs. 217 */ 218 __be16 hh_type ____cacheline_aligned_in_smp; 219 /* protocol identifier, f.e ETH_P_IP 220 * NOTE: For VLANs, this will be the 221 * encapuslated type. --BLG 222 */ 223 u16 hh_len; /* length of header */ 224 int (*hh_output)(struct sk_buff *skb); 225 seqlock_t hh_lock; 226 227 /* cached hardware header; allow for machine alignment needs. */ 228 #define HH_DATA_MOD 16 229 #define HH_DATA_OFF(__len) \ 230 (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1)) 231 #define HH_DATA_ALIGN(__len) \ 232 (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1)) 233 unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)]; 234 }; 235 236 /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much. 237 * Alternative is: 238 * dev->hard_header_len ? (dev->hard_header_len + 239 * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0 240 * 241 * We could use other alignment values, but we must maintain the 242 * relationship HH alignment <= LL alignment. 243 */ 244 #define LL_RESERVED_SPACE(dev) \ 245 (((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 246 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \ 247 ((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD) 248 249 /* These flag bits are private to the generic network queueing 250 * layer, they may not be explicitly referenced by any other 251 * code. 252 */ 253 254 enum netdev_state_t 255 { 256 __LINK_STATE_XOFF=0, 257 __LINK_STATE_START, 258 __LINK_STATE_PRESENT, 259 __LINK_STATE_SCHED, 260 __LINK_STATE_NOCARRIER, 261 __LINK_STATE_RX_SCHED, 262 __LINK_STATE_LINKWATCH_PENDING, 263 __LINK_STATE_DORMANT, 264 __LINK_STATE_QDISC_RUNNING, 265 /* Set by the netpoll NAPI code */ 266 __LINK_STATE_POLL_LIST_FROZEN, 267 }; 268 269 270 /* 271 * This structure holds at boot time configured netdevice settings. They 272 * are then used in the device probing. 273 */ 274 struct netdev_boot_setup { 275 char name[IFNAMSIZ]; 276 struct ifmap map; 277 }; 278 #define NETDEV_BOOT_SETUP_MAX 8 279 280 extern int __init netdev_boot_setup(char *str); 281 282 /* 283 * The DEVICE structure. 284 * Actually, this whole structure is a big mistake. It mixes I/O 285 * data with strictly "high-level" data, and it has to know about 286 * almost every data structure used in the INET module. 287 * 288 * FIXME: cleanup struct net_device such that network protocol info 289 * moves out. 290 */ 291 292 struct net_device 293 { 294 295 /* 296 * This is the first field of the "visible" part of this structure 297 * (i.e. as seen by users in the "Space.c" file). It is the name 298 * the interface. 299 */ 300 char name[IFNAMSIZ]; 301 /* device name hash chain */ 302 struct hlist_node name_hlist; 303 304 /* 305 * I/O specific fields 306 * FIXME: Merge these and struct ifmap into one 307 */ 308 unsigned long mem_end; /* shared mem end */ 309 unsigned long mem_start; /* shared mem start */ 310 unsigned long base_addr; /* device I/O address */ 311 unsigned int irq; /* device IRQ number */ 312 313 /* 314 * Some hardware also needs these fields, but they are not 315 * part of the usual set specified in Space.c. 316 */ 317 318 unsigned char if_port; /* Selectable AUI, TP,..*/ 319 unsigned char dma; /* DMA channel */ 320 321 unsigned long state; 322 323 struct list_head dev_list; 324 325 /* The device initialization function. Called only once. */ 326 int (*init)(struct net_device *dev); 327 328 /* ------- Fields preinitialized in Space.c finish here ------- */ 329 330 /* Net device features */ 331 unsigned long features; 332 #define NETIF_F_SG 1 /* Scatter/gather IO. */ 333 #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */ 334 #define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */ 335 #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */ 336 #define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */ 337 #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */ 338 #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */ 339 #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */ 340 #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */ 341 #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */ 342 #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */ 343 #define NETIF_F_GSO 2048 /* Enable software GSO. */ 344 #define NETIF_F_LLTX 4096 /* LockLess TX */ 345 #define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */ 346 347 /* Segmentation offload features */ 348 #define NETIF_F_GSO_SHIFT 16 349 #define NETIF_F_GSO_MASK 0xffff0000 350 #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT) 351 #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT) 352 #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT) 353 #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT) 354 #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT) 355 356 /* List of features with software fallbacks. */ 357 #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6) 358 359 360 #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) 361 #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM) 362 #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM) 363 #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM) 364 365 struct net_device *next_sched; 366 367 /* Interface index. Unique device identifier */ 368 int ifindex; 369 int iflink; 370 371 372 struct net_device_stats* (*get_stats)(struct net_device *dev); 373 struct net_device_stats stats; 374 375 #ifdef CONFIG_WIRELESS_EXT 376 /* List of functions to handle Wireless Extensions (instead of ioctl). 377 * See <net/iw_handler.h> for details. Jean II */ 378 const struct iw_handler_def * wireless_handlers; 379 /* Instance data managed by the core of Wireless Extensions. */ 380 struct iw_public_data * wireless_data; 381 #endif 382 const struct ethtool_ops *ethtool_ops; 383 384 /* 385 * This marks the end of the "visible" part of the structure. All 386 * fields hereafter are internal to the system, and may change at 387 * will (read: may be cleaned up at will). 388 */ 389 390 391 unsigned int flags; /* interface flags (a la BSD) */ 392 unsigned short gflags; 393 unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */ 394 unsigned short padded; /* How much padding added by alloc_netdev() */ 395 396 unsigned char operstate; /* RFC2863 operstate */ 397 unsigned char link_mode; /* mapping policy to operstate */ 398 399 unsigned mtu; /* interface MTU value */ 400 unsigned short type; /* interface hardware type */ 401 unsigned short hard_header_len; /* hardware hdr length */ 402 403 struct net_device *master; /* Pointer to master device of a group, 404 * which this device is member of. 405 */ 406 407 /* Interface address info. */ 408 unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */ 409 unsigned char addr_len; /* hardware address length */ 410 unsigned short dev_id; /* for shared network cards */ 411 412 struct dev_addr_list *uc_list; /* Secondary unicast mac addresses */ 413 int uc_count; /* Number of installed ucasts */ 414 int uc_promisc; 415 struct dev_addr_list *mc_list; /* Multicast mac addresses */ 416 int mc_count; /* Number of installed mcasts */ 417 int promiscuity; 418 int allmulti; 419 420 421 /* Protocol specific pointers */ 422 423 void *atalk_ptr; /* AppleTalk link */ 424 void *ip_ptr; /* IPv4 specific data */ 425 void *dn_ptr; /* DECnet specific data */ 426 void *ip6_ptr; /* IPv6 specific data */ 427 void *ec_ptr; /* Econet specific data */ 428 void *ax25_ptr; /* AX.25 specific data */ 429 struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data, 430 assign before registering */ 431 432 /* 433 * Cache line mostly used on receive path (including eth_type_trans()) 434 */ 435 struct list_head poll_list ____cacheline_aligned_in_smp; 436 /* Link to poll list */ 437 438 int (*poll) (struct net_device *dev, int *quota); 439 int quota; 440 int weight; 441 unsigned long last_rx; /* Time of last Rx */ 442 /* Interface address info used in eth_type_trans() */ 443 unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast 444 because most packets are unicast) */ 445 446 unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */ 447 448 /* 449 * Cache line mostly used on queue transmit path (qdisc) 450 */ 451 /* device queue lock */ 452 spinlock_t queue_lock ____cacheline_aligned_in_smp; 453 struct Qdisc *qdisc; 454 struct Qdisc *qdisc_sleeping; 455 struct list_head qdisc_list; 456 unsigned long tx_queue_len; /* Max frames per queue allowed */ 457 458 /* Partially transmitted GSO packet. */ 459 struct sk_buff *gso_skb; 460 461 /* ingress path synchronizer */ 462 spinlock_t ingress_lock; 463 struct Qdisc *qdisc_ingress; 464 465 /* 466 * One part is mostly used on xmit path (device) 467 */ 468 /* hard_start_xmit synchronizer */ 469 spinlock_t _xmit_lock ____cacheline_aligned_in_smp; 470 /* cpu id of processor entered to hard_start_xmit or -1, 471 if nobody entered there. 472 */ 473 int xmit_lock_owner; 474 void *priv; /* pointer to private data */ 475 int (*hard_start_xmit) (struct sk_buff *skb, 476 struct net_device *dev); 477 /* These may be needed for future network-power-down code. */ 478 unsigned long trans_start; /* Time (in jiffies) of last Tx */ 479 480 int watchdog_timeo; /* used by dev_watchdog() */ 481 struct timer_list watchdog_timer; 482 483 /* 484 * refcnt is a very hot point, so align it on SMP 485 */ 486 /* Number of references to this device */ 487 atomic_t refcnt ____cacheline_aligned_in_smp; 488 489 /* delayed register/unregister */ 490 struct list_head todo_list; 491 /* device index hash chain */ 492 struct hlist_node index_hlist; 493 494 struct net_device *link_watch_next; 495 496 /* register/unregister state machine */ 497 enum { NETREG_UNINITIALIZED=0, 498 NETREG_REGISTERED, /* completed register_netdevice */ 499 NETREG_UNREGISTERING, /* called unregister_netdevice */ 500 NETREG_UNREGISTERED, /* completed unregister todo */ 501 NETREG_RELEASED, /* called free_netdev */ 502 } reg_state; 503 504 /* Called after device is detached from network. */ 505 void (*uninit)(struct net_device *dev); 506 /* Called after last user reference disappears. */ 507 void (*destructor)(struct net_device *dev); 508 509 /* Pointers to interface service routines. */ 510 int (*open)(struct net_device *dev); 511 int (*stop)(struct net_device *dev); 512 #define HAVE_NETDEV_POLL 513 int (*hard_header) (struct sk_buff *skb, 514 struct net_device *dev, 515 unsigned short type, 516 void *daddr, 517 void *saddr, 518 unsigned len); 519 int (*rebuild_header)(struct sk_buff *skb); 520 #define HAVE_CHANGE_RX_FLAGS 521 void (*change_rx_flags)(struct net_device *dev, 522 int flags); 523 #define HAVE_SET_RX_MODE 524 void (*set_rx_mode)(struct net_device *dev); 525 #define HAVE_MULTICAST 526 void (*set_multicast_list)(struct net_device *dev); 527 #define HAVE_SET_MAC_ADDR 528 int (*set_mac_address)(struct net_device *dev, 529 void *addr); 530 #define HAVE_PRIVATE_IOCTL 531 int (*do_ioctl)(struct net_device *dev, 532 struct ifreq *ifr, int cmd); 533 #define HAVE_SET_CONFIG 534 int (*set_config)(struct net_device *dev, 535 struct ifmap *map); 536 #define HAVE_HEADER_CACHE 537 int (*hard_header_cache)(struct neighbour *neigh, 538 struct hh_cache *hh); 539 void (*header_cache_update)(struct hh_cache *hh, 540 struct net_device *dev, 541 unsigned char * haddr); 542 #define HAVE_CHANGE_MTU 543 int (*change_mtu)(struct net_device *dev, int new_mtu); 544 545 #define HAVE_TX_TIMEOUT 546 void (*tx_timeout) (struct net_device *dev); 547 548 void (*vlan_rx_register)(struct net_device *dev, 549 struct vlan_group *grp); 550 void (*vlan_rx_add_vid)(struct net_device *dev, 551 unsigned short vid); 552 void (*vlan_rx_kill_vid)(struct net_device *dev, 553 unsigned short vid); 554 555 int (*hard_header_parse)(struct sk_buff *skb, 556 unsigned char *haddr); 557 int (*neigh_setup)(struct net_device *dev, struct neigh_parms *); 558 #ifdef CONFIG_NETPOLL 559 struct netpoll_info *npinfo; 560 #endif 561 #ifdef CONFIG_NET_POLL_CONTROLLER 562 void (*poll_controller)(struct net_device *dev); 563 #endif 564 565 /* bridge stuff */ 566 struct net_bridge_port *br_port; 567 /* macvlan */ 568 struct macvlan_port *macvlan_port; 569 570 /* class/net/name entry */ 571 struct device dev; 572 /* space for optional statistics and wireless sysfs groups */ 573 struct attribute_group *sysfs_groups[3]; 574 575 /* rtnetlink link ops */ 576 const struct rtnl_link_ops *rtnl_link_ops; 577 578 /* The TX queue control structures */ 579 unsigned int egress_subqueue_count; 580 struct net_device_subqueue egress_subqueue[0]; 581 }; 582 #define to_net_dev(d) container_of(d, struct net_device, dev) 583 584 #define NETDEV_ALIGN 32 585 #define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1) 586 587 static inline void *netdev_priv(const struct net_device *dev) 588 { 589 return dev->priv; 590 } 591 592 #define SET_MODULE_OWNER(dev) do { } while (0) 593 /* Set the sysfs physical device reference for the network logical device 594 * if set prior to registration will cause a symlink during initialization. 595 */ 596 #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev)) 597 598 struct packet_type { 599 __be16 type; /* This is really htons(ether_type). */ 600 struct net_device *dev; /* NULL is wildcarded here */ 601 int (*func) (struct sk_buff *, 602 struct net_device *, 603 struct packet_type *, 604 struct net_device *); 605 struct sk_buff *(*gso_segment)(struct sk_buff *skb, 606 int features); 607 int (*gso_send_check)(struct sk_buff *skb); 608 void *af_packet_priv; 609 struct list_head list; 610 }; 611 612 #include <linux/interrupt.h> 613 #include <linux/notifier.h> 614 615 extern struct net_device loopback_dev; /* The loopback */ 616 extern struct list_head dev_base_head; /* All devices */ 617 extern rwlock_t dev_base_lock; /* Device list lock */ 618 619 #define for_each_netdev(d) \ 620 list_for_each_entry(d, &dev_base_head, dev_list) 621 #define for_each_netdev_safe(d, n) \ 622 list_for_each_entry_safe(d, n, &dev_base_head, dev_list) 623 #define for_each_netdev_continue(d) \ 624 list_for_each_entry_continue(d, &dev_base_head, dev_list) 625 #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list) 626 627 static inline struct net_device *next_net_device(struct net_device *dev) 628 { 629 struct list_head *lh; 630 631 lh = dev->dev_list.next; 632 return lh == &dev_base_head ? NULL : net_device_entry(lh); 633 } 634 635 static inline struct net_device *first_net_device(void) 636 { 637 return list_empty(&dev_base_head) ? NULL : 638 net_device_entry(dev_base_head.next); 639 } 640 641 extern int netdev_boot_setup_check(struct net_device *dev); 642 extern unsigned long netdev_boot_base(const char *prefix, int unit); 643 extern struct net_device *dev_getbyhwaddr(unsigned short type, char *hwaddr); 644 extern struct net_device *dev_getfirstbyhwtype(unsigned short type); 645 extern struct net_device *__dev_getfirstbyhwtype(unsigned short type); 646 extern void dev_add_pack(struct packet_type *pt); 647 extern void dev_remove_pack(struct packet_type *pt); 648 extern void __dev_remove_pack(struct packet_type *pt); 649 650 extern struct net_device *dev_get_by_flags(unsigned short flags, 651 unsigned short mask); 652 extern struct net_device *dev_get_by_name(const char *name); 653 extern struct net_device *__dev_get_by_name(const char *name); 654 extern int dev_alloc_name(struct net_device *dev, const char *name); 655 extern int dev_open(struct net_device *dev); 656 extern int dev_close(struct net_device *dev); 657 extern int dev_queue_xmit(struct sk_buff *skb); 658 extern int register_netdevice(struct net_device *dev); 659 extern void unregister_netdevice(struct net_device *dev); 660 extern void free_netdev(struct net_device *dev); 661 extern void synchronize_net(void); 662 extern int register_netdevice_notifier(struct notifier_block *nb); 663 extern int unregister_netdevice_notifier(struct notifier_block *nb); 664 extern int call_netdevice_notifiers(unsigned long val, void *v); 665 extern struct net_device *dev_get_by_index(int ifindex); 666 extern struct net_device *__dev_get_by_index(int ifindex); 667 extern int dev_restart(struct net_device *dev); 668 #ifdef CONFIG_NETPOLL_TRAP 669 extern int netpoll_trap(void); 670 #endif 671 672 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len); 673 extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf); 674 static inline int unregister_gifconf(unsigned int family) 675 { 676 return register_gifconf(family, NULL); 677 } 678 679 /* 680 * Incoming packets are placed on per-cpu queues so that 681 * no locking is needed. 682 */ 683 684 struct softnet_data 685 { 686 struct net_device *output_queue; 687 struct sk_buff_head input_pkt_queue; 688 struct list_head poll_list; 689 struct sk_buff *completion_queue; 690 691 struct net_device backlog_dev; /* Sorry. 8) */ 692 #ifdef CONFIG_NET_DMA 693 struct dma_chan *net_dma; 694 #endif 695 }; 696 697 DECLARE_PER_CPU(struct softnet_data,softnet_data); 698 699 #define HAVE_NETIF_QUEUE 700 701 extern void __netif_schedule(struct net_device *dev); 702 703 static inline void netif_schedule(struct net_device *dev) 704 { 705 if (!test_bit(__LINK_STATE_XOFF, &dev->state)) 706 __netif_schedule(dev); 707 } 708 709 static inline void netif_start_queue(struct net_device *dev) 710 { 711 clear_bit(__LINK_STATE_XOFF, &dev->state); 712 } 713 714 static inline void netif_wake_queue(struct net_device *dev) 715 { 716 #ifdef CONFIG_NETPOLL_TRAP 717 if (netpoll_trap()) { 718 clear_bit(__LINK_STATE_XOFF, &dev->state); 719 return; 720 } 721 #endif 722 if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state)) 723 __netif_schedule(dev); 724 } 725 726 static inline void netif_stop_queue(struct net_device *dev) 727 { 728 set_bit(__LINK_STATE_XOFF, &dev->state); 729 } 730 731 static inline int netif_queue_stopped(const struct net_device *dev) 732 { 733 return test_bit(__LINK_STATE_XOFF, &dev->state); 734 } 735 736 static inline int netif_running(const struct net_device *dev) 737 { 738 return test_bit(__LINK_STATE_START, &dev->state); 739 } 740 741 /* 742 * Routines to manage the subqueues on a device. We only need start 743 * stop, and a check if it's stopped. All other device management is 744 * done at the overall netdevice level. 745 * Also test the device if we're multiqueue. 746 */ 747 static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index) 748 { 749 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 750 clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 751 #endif 752 } 753 754 static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index) 755 { 756 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 757 #ifdef CONFIG_NETPOLL_TRAP 758 if (netpoll_trap()) 759 return; 760 #endif 761 set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state); 762 #endif 763 } 764 765 static inline int netif_subqueue_stopped(const struct net_device *dev, 766 u16 queue_index) 767 { 768 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 769 return test_bit(__LINK_STATE_XOFF, 770 &dev->egress_subqueue[queue_index].state); 771 #else 772 return 0; 773 #endif 774 } 775 776 static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index) 777 { 778 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 779 #ifdef CONFIG_NETPOLL_TRAP 780 if (netpoll_trap()) 781 return; 782 #endif 783 if (test_and_clear_bit(__LINK_STATE_XOFF, 784 &dev->egress_subqueue[queue_index].state)) 785 __netif_schedule(dev); 786 #endif 787 } 788 789 static inline int netif_is_multiqueue(const struct net_device *dev) 790 { 791 #ifdef CONFIG_NETDEVICES_MULTIQUEUE 792 return (!!(NETIF_F_MULTI_QUEUE & dev->features)); 793 #else 794 return 0; 795 #endif 796 } 797 798 /* Use this variant when it is known for sure that it 799 * is executing from interrupt context. 800 */ 801 static inline void dev_kfree_skb_irq(struct sk_buff *skb) 802 { 803 if (atomic_dec_and_test(&skb->users)) { 804 struct softnet_data *sd; 805 unsigned long flags; 806 807 local_irq_save(flags); 808 sd = &__get_cpu_var(softnet_data); 809 skb->next = sd->completion_queue; 810 sd->completion_queue = skb; 811 raise_softirq_irqoff(NET_TX_SOFTIRQ); 812 local_irq_restore(flags); 813 } 814 } 815 816 /* Use this variant in places where it could be invoked 817 * either from interrupt or non-interrupt context. 818 */ 819 extern void dev_kfree_skb_any(struct sk_buff *skb); 820 821 #define HAVE_NETIF_RX 1 822 extern int netif_rx(struct sk_buff *skb); 823 extern int netif_rx_ni(struct sk_buff *skb); 824 #define HAVE_NETIF_RECEIVE_SKB 1 825 extern int netif_receive_skb(struct sk_buff *skb); 826 extern int dev_valid_name(const char *name); 827 extern int dev_ioctl(unsigned int cmd, void __user *); 828 extern int dev_ethtool(struct ifreq *); 829 extern unsigned dev_get_flags(const struct net_device *); 830 extern int dev_change_flags(struct net_device *, unsigned); 831 extern int dev_change_name(struct net_device *, char *); 832 extern int dev_set_mtu(struct net_device *, int); 833 extern int dev_set_mac_address(struct net_device *, 834 struct sockaddr *); 835 extern int dev_hard_start_xmit(struct sk_buff *skb, 836 struct net_device *dev); 837 838 extern void dev_init(void); 839 840 extern int netdev_budget; 841 842 /* Called by rtnetlink.c:rtnl_unlock() */ 843 extern void netdev_run_todo(void); 844 845 static inline void dev_put(struct net_device *dev) 846 { 847 atomic_dec(&dev->refcnt); 848 } 849 850 static inline void dev_hold(struct net_device *dev) 851 { 852 atomic_inc(&dev->refcnt); 853 } 854 855 /* Carrier loss detection, dial on demand. The functions netif_carrier_on 856 * and _off may be called from IRQ context, but it is caller 857 * who is responsible for serialization of these calls. 858 * 859 * The name carrier is inappropriate, these functions should really be 860 * called netif_lowerlayer_*() because they represent the state of any 861 * kind of lower layer not just hardware media. 862 */ 863 864 extern void linkwatch_fire_event(struct net_device *dev); 865 866 static inline int netif_carrier_ok(const struct net_device *dev) 867 { 868 return !test_bit(__LINK_STATE_NOCARRIER, &dev->state); 869 } 870 871 extern void __netdev_watchdog_up(struct net_device *dev); 872 873 extern void netif_carrier_on(struct net_device *dev); 874 875 extern void netif_carrier_off(struct net_device *dev); 876 877 static inline void netif_dormant_on(struct net_device *dev) 878 { 879 if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state)) 880 linkwatch_fire_event(dev); 881 } 882 883 static inline void netif_dormant_off(struct net_device *dev) 884 { 885 if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state)) 886 linkwatch_fire_event(dev); 887 } 888 889 static inline int netif_dormant(const struct net_device *dev) 890 { 891 return test_bit(__LINK_STATE_DORMANT, &dev->state); 892 } 893 894 895 static inline int netif_oper_up(const struct net_device *dev) { 896 return (dev->operstate == IF_OPER_UP || 897 dev->operstate == IF_OPER_UNKNOWN /* backward compat */); 898 } 899 900 /* Hot-plugging. */ 901 static inline int netif_device_present(struct net_device *dev) 902 { 903 return test_bit(__LINK_STATE_PRESENT, &dev->state); 904 } 905 906 extern void netif_device_detach(struct net_device *dev); 907 908 extern void netif_device_attach(struct net_device *dev); 909 910 /* 911 * Network interface message level settings 912 */ 913 #define HAVE_NETIF_MSG 1 914 915 enum { 916 NETIF_MSG_DRV = 0x0001, 917 NETIF_MSG_PROBE = 0x0002, 918 NETIF_MSG_LINK = 0x0004, 919 NETIF_MSG_TIMER = 0x0008, 920 NETIF_MSG_IFDOWN = 0x0010, 921 NETIF_MSG_IFUP = 0x0020, 922 NETIF_MSG_RX_ERR = 0x0040, 923 NETIF_MSG_TX_ERR = 0x0080, 924 NETIF_MSG_TX_QUEUED = 0x0100, 925 NETIF_MSG_INTR = 0x0200, 926 NETIF_MSG_TX_DONE = 0x0400, 927 NETIF_MSG_RX_STATUS = 0x0800, 928 NETIF_MSG_PKTDATA = 0x1000, 929 NETIF_MSG_HW = 0x2000, 930 NETIF_MSG_WOL = 0x4000, 931 }; 932 933 #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV) 934 #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE) 935 #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK) 936 #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER) 937 #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN) 938 #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP) 939 #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR) 940 #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR) 941 #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED) 942 #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR) 943 #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE) 944 #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS) 945 #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA) 946 #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW) 947 #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL) 948 949 static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) 950 { 951 /* use default */ 952 if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) 953 return default_msg_enable_bits; 954 if (debug_value == 0) /* no output */ 955 return 0; 956 /* set low N bits */ 957 return (1 << debug_value) - 1; 958 } 959 960 /* Test if receive needs to be scheduled */ 961 static inline int __netif_rx_schedule_prep(struct net_device *dev) 962 { 963 return !test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state); 964 } 965 966 /* Test if receive needs to be scheduled but only if up */ 967 static inline int netif_rx_schedule_prep(struct net_device *dev) 968 { 969 return netif_running(dev) && __netif_rx_schedule_prep(dev); 970 } 971 972 /* Add interface to tail of rx poll list. This assumes that _prep has 973 * already been called and returned 1. 974 */ 975 976 extern void __netif_rx_schedule(struct net_device *dev); 977 978 /* Try to reschedule poll. Called by irq handler. */ 979 980 static inline void netif_rx_schedule(struct net_device *dev) 981 { 982 if (netif_rx_schedule_prep(dev)) 983 __netif_rx_schedule(dev); 984 } 985 986 /* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). 987 * Do not inline this? 988 */ 989 static inline int netif_rx_reschedule(struct net_device *dev, int undo) 990 { 991 if (netif_rx_schedule_prep(dev)) { 992 unsigned long flags; 993 994 dev->quota += undo; 995 996 local_irq_save(flags); 997 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); 998 __raise_softirq_irqoff(NET_RX_SOFTIRQ); 999 local_irq_restore(flags); 1000 return 1; 1001 } 1002 return 0; 1003 } 1004 1005 /* same as netif_rx_complete, except that local_irq_save(flags) 1006 * has already been issued 1007 */ 1008 static inline void __netif_rx_complete(struct net_device *dev) 1009 { 1010 BUG_ON(!test_bit(__LINK_STATE_RX_SCHED, &dev->state)); 1011 list_del(&dev->poll_list); 1012 smp_mb__before_clear_bit(); 1013 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 1014 } 1015 1016 /* Remove interface from poll list: it must be in the poll list 1017 * on current cpu. This primitive is called by dev->poll(), when 1018 * it completes the work. The device cannot be out of poll list at this 1019 * moment, it is BUG(). 1020 */ 1021 static inline void netif_rx_complete(struct net_device *dev) 1022 { 1023 unsigned long flags; 1024 1025 #ifdef CONFIG_NETPOLL 1026 /* Prevent race with netpoll - yes, this is a kludge. 1027 * But at least it doesn't penalize the non-netpoll 1028 * code path. */ 1029 if (test_bit(__LINK_STATE_POLL_LIST_FROZEN, &dev->state)) 1030 return; 1031 #endif 1032 1033 local_irq_save(flags); 1034 __netif_rx_complete(dev); 1035 local_irq_restore(flags); 1036 } 1037 1038 static inline void netif_poll_disable(struct net_device *dev) 1039 { 1040 while (test_and_set_bit(__LINK_STATE_RX_SCHED, &dev->state)) 1041 /* No hurry. */ 1042 schedule_timeout_interruptible(1); 1043 } 1044 1045 static inline void netif_poll_enable(struct net_device *dev) 1046 { 1047 smp_mb__before_clear_bit(); 1048 clear_bit(__LINK_STATE_RX_SCHED, &dev->state); 1049 } 1050 1051 static inline void netif_tx_lock(struct net_device *dev) 1052 { 1053 spin_lock(&dev->_xmit_lock); 1054 dev->xmit_lock_owner = smp_processor_id(); 1055 } 1056 1057 static inline void netif_tx_lock_bh(struct net_device *dev) 1058 { 1059 spin_lock_bh(&dev->_xmit_lock); 1060 dev->xmit_lock_owner = smp_processor_id(); 1061 } 1062 1063 static inline int netif_tx_trylock(struct net_device *dev) 1064 { 1065 int ok = spin_trylock(&dev->_xmit_lock); 1066 if (likely(ok)) 1067 dev->xmit_lock_owner = smp_processor_id(); 1068 return ok; 1069 } 1070 1071 static inline void netif_tx_unlock(struct net_device *dev) 1072 { 1073 dev->xmit_lock_owner = -1; 1074 spin_unlock(&dev->_xmit_lock); 1075 } 1076 1077 static inline void netif_tx_unlock_bh(struct net_device *dev) 1078 { 1079 dev->xmit_lock_owner = -1; 1080 spin_unlock_bh(&dev->_xmit_lock); 1081 } 1082 1083 static inline void netif_tx_disable(struct net_device *dev) 1084 { 1085 netif_tx_lock_bh(dev); 1086 netif_stop_queue(dev); 1087 netif_tx_unlock_bh(dev); 1088 } 1089 1090 /* These functions live elsewhere (drivers/net/net_init.c, but related) */ 1091 1092 extern void ether_setup(struct net_device *dev); 1093 1094 /* Support for loadable net-drivers */ 1095 extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, 1096 void (*setup)(struct net_device *), 1097 unsigned int queue_count); 1098 #define alloc_netdev(sizeof_priv, name, setup) \ 1099 alloc_netdev_mq(sizeof_priv, name, setup, 1) 1100 extern int register_netdev(struct net_device *dev); 1101 extern void unregister_netdev(struct net_device *dev); 1102 /* Functions used for secondary unicast and multicast support */ 1103 extern void dev_set_rx_mode(struct net_device *dev); 1104 extern void __dev_set_rx_mode(struct net_device *dev); 1105 extern int dev_unicast_delete(struct net_device *dev, void *addr, int alen); 1106 extern int dev_unicast_add(struct net_device *dev, void *addr, int alen); 1107 extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all); 1108 extern int dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly); 1109 extern int dev_mc_sync(struct net_device *to, struct net_device *from); 1110 extern void dev_mc_unsync(struct net_device *to, struct net_device *from); 1111 extern void dev_mc_discard(struct net_device *dev); 1112 extern int __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all); 1113 extern int __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly); 1114 extern void __dev_addr_discard(struct dev_addr_list **list); 1115 extern void dev_set_promiscuity(struct net_device *dev, int inc); 1116 extern void dev_set_allmulti(struct net_device *dev, int inc); 1117 extern void netdev_state_change(struct net_device *dev); 1118 extern void netdev_features_change(struct net_device *dev); 1119 /* Load a device via the kmod */ 1120 extern void dev_load(const char *name); 1121 extern void dev_mcast_init(void); 1122 extern int netdev_max_backlog; 1123 extern int weight_p; 1124 extern int netdev_set_master(struct net_device *dev, struct net_device *master); 1125 extern int skb_checksum_help(struct sk_buff *skb); 1126 extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features); 1127 #ifdef CONFIG_BUG 1128 extern void netdev_rx_csum_fault(struct net_device *dev); 1129 #else 1130 static inline void netdev_rx_csum_fault(struct net_device *dev) 1131 { 1132 } 1133 #endif 1134 /* rx skb timestamps */ 1135 extern void net_enable_timestamp(void); 1136 extern void net_disable_timestamp(void); 1137 1138 #ifdef CONFIG_PROC_FS 1139 extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); 1140 extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); 1141 extern void dev_seq_stop(struct seq_file *seq, void *v); 1142 #endif 1143 1144 extern void linkwatch_run_queue(void); 1145 1146 static inline int net_gso_ok(int features, int gso_type) 1147 { 1148 int feature = gso_type << NETIF_F_GSO_SHIFT; 1149 return (features & feature) == feature; 1150 } 1151 1152 static inline int skb_gso_ok(struct sk_buff *skb, int features) 1153 { 1154 return net_gso_ok(features, skb_shinfo(skb)->gso_type); 1155 } 1156 1157 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb) 1158 { 1159 return skb_is_gso(skb) && 1160 (!skb_gso_ok(skb, dev->features) || 1161 unlikely(skb->ip_summed != CHECKSUM_PARTIAL)); 1162 } 1163 1164 /* On bonding slaves other than the currently active slave, suppress 1165 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and 1166 * ARP on active-backup slaves with arp_validate enabled. 1167 */ 1168 static inline int skb_bond_should_drop(struct sk_buff *skb) 1169 { 1170 struct net_device *dev = skb->dev; 1171 struct net_device *master = dev->master; 1172 1173 if (master && 1174 (dev->priv_flags & IFF_SLAVE_INACTIVE)) { 1175 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && 1176 skb->protocol == __constant_htons(ETH_P_ARP)) 1177 return 0; 1178 1179 if (master->priv_flags & IFF_MASTER_ALB) { 1180 if (skb->pkt_type != PACKET_BROADCAST && 1181 skb->pkt_type != PACKET_MULTICAST) 1182 return 0; 1183 } 1184 if (master->priv_flags & IFF_MASTER_8023AD && 1185 skb->protocol == __constant_htons(ETH_P_SLOW)) 1186 return 0; 1187 1188 return 1; 1189 } 1190 return 0; 1191 } 1192 1193 #endif /* __KERNEL__ */ 1194 1195 #endif /* _LINUX_DEV_H */ 1196