Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Common framework for low-level network console, dump, and debugger code |
| 3 | * |
| 4 | * Sep 8 2003 Matt Mackall <mpm@selenic.com> |
| 5 | * |
| 6 | * based on the netconsole code from: |
| 7 | * |
| 8 | * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> |
| 9 | * Copyright (C) 2002 Red Hat, Inc. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/smp_lock.h> |
| 13 | #include <linux/netdevice.h> |
| 14 | #include <linux/etherdevice.h> |
| 15 | #include <linux/string.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 16 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/inetdevice.h> |
| 18 | #include <linux/inet.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/netpoll.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/rcupdate.h> |
| 24 | #include <linux/workqueue.h> |
| 25 | #include <net/tcp.h> |
| 26 | #include <net/udp.h> |
| 27 | #include <asm/unaligned.h> |
| 28 | |
| 29 | /* |
| 30 | * We maintain a small pool of fully-sized skbs, to make sure the |
| 31 | * message gets out even in extreme OOM situations. |
| 32 | */ |
| 33 | |
| 34 | #define MAX_UDP_CHUNK 1460 |
| 35 | #define MAX_SKBS 32 |
| 36 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 37 | #define MAX_RETRIES 20000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | static DEFINE_SPINLOCK(skb_list_lock); |
| 40 | static int nr_skbs; |
| 41 | static struct sk_buff *skbs; |
| 42 | |
| 43 | static DEFINE_SPINLOCK(queue_lock); |
| 44 | static int queue_depth; |
| 45 | static struct sk_buff *queue_head, *queue_tail; |
| 46 | |
| 47 | static atomic_t trapped; |
| 48 | |
| 49 | #define NETPOLL_RX_ENABLED 1 |
| 50 | #define NETPOLL_RX_DROP 2 |
| 51 | |
| 52 | #define MAX_SKB_SIZE \ |
| 53 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ |
| 54 | sizeof(struct iphdr) + sizeof(struct ethhdr)) |
| 55 | |
| 56 | static void zap_completion_queue(void); |
| 57 | |
| 58 | static void queue_process(void *p) |
| 59 | { |
| 60 | unsigned long flags; |
| 61 | struct sk_buff *skb; |
| 62 | |
| 63 | while (queue_head) { |
| 64 | spin_lock_irqsave(&queue_lock, flags); |
| 65 | |
| 66 | skb = queue_head; |
| 67 | queue_head = skb->next; |
| 68 | if (skb == queue_tail) |
| 69 | queue_head = NULL; |
| 70 | |
| 71 | queue_depth--; |
| 72 | |
| 73 | spin_unlock_irqrestore(&queue_lock, flags); |
| 74 | |
| 75 | dev_queue_xmit(skb); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | static DECLARE_WORK(send_queue, queue_process, NULL); |
| 80 | |
| 81 | void netpoll_queue(struct sk_buff *skb) |
| 82 | { |
| 83 | unsigned long flags; |
| 84 | |
| 85 | if (queue_depth == MAX_QUEUE_DEPTH) { |
| 86 | __kfree_skb(skb); |
| 87 | return; |
| 88 | } |
| 89 | |
| 90 | spin_lock_irqsave(&queue_lock, flags); |
| 91 | if (!queue_head) |
| 92 | queue_head = skb; |
| 93 | else |
| 94 | queue_tail->next = skb; |
| 95 | queue_tail = skb; |
| 96 | queue_depth++; |
| 97 | spin_unlock_irqrestore(&queue_lock, flags); |
| 98 | |
| 99 | schedule_work(&send_queue); |
| 100 | } |
| 101 | |
| 102 | static int checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
| 103 | unsigned short ulen, u32 saddr, u32 daddr) |
| 104 | { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 105 | unsigned int psum; |
| 106 | |
| 107 | if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return 0; |
| 109 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 110 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 112 | if (skb->ip_summed == CHECKSUM_HW && |
| 113 | !(u16)csum_fold(csum_add(psum, skb->csum))) |
| 114 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 116 | skb->csum = psum; |
| 117 | |
| 118 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Check whether delayed processing was scheduled for our NIC. If so, |
| 123 | * we attempt to grab the poll lock and use ->poll() to pump the card. |
| 124 | * If this fails, either we've recursed in ->poll() or it's already |
| 125 | * running on another CPU. |
| 126 | * |
| 127 | * Note: we don't mask interrupts with this lock because we're using |
| 128 | * trylock here and interrupts are already disabled in the softirq |
| 129 | * case. Further, we test the poll_owner to avoid recursion on UP |
| 130 | * systems where the lock doesn't exist. |
| 131 | * |
| 132 | * In cases where there is bi-directional communications, reading only |
| 133 | * one message at a time can lead to packets being dropped by the |
| 134 | * network adapter, forcing superfluous retries and possibly timeouts. |
| 135 | * Thus, we set our budget to greater than 1. |
| 136 | */ |
| 137 | static void poll_napi(struct netpoll *np) |
| 138 | { |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 139 | struct netpoll_info *npinfo = np->dev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | int budget = 16; |
| 141 | |
| 142 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 143 | npinfo->poll_owner != smp_processor_id() && |
| 144 | spin_trylock(&npinfo->poll_lock)) { |
| 145 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | atomic_inc(&trapped); |
| 147 | |
| 148 | np->dev->poll(np->dev, &budget); |
| 149 | |
| 150 | atomic_dec(&trapped); |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 151 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
| 152 | spin_unlock(&npinfo->poll_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | } |
| 154 | } |
| 155 | |
| 156 | void netpoll_poll(struct netpoll *np) |
| 157 | { |
| 158 | if(!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) |
| 159 | return; |
| 160 | |
| 161 | /* Process pending work on NIC */ |
| 162 | np->dev->poll_controller(np->dev); |
| 163 | if (np->dev->poll) |
| 164 | poll_napi(np); |
| 165 | |
| 166 | zap_completion_queue(); |
| 167 | } |
| 168 | |
| 169 | static void refill_skbs(void) |
| 170 | { |
| 171 | struct sk_buff *skb; |
| 172 | unsigned long flags; |
| 173 | |
| 174 | spin_lock_irqsave(&skb_list_lock, flags); |
| 175 | while (nr_skbs < MAX_SKBS) { |
| 176 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
| 177 | if (!skb) |
| 178 | break; |
| 179 | |
| 180 | skb->next = skbs; |
| 181 | skbs = skb; |
| 182 | nr_skbs++; |
| 183 | } |
| 184 | spin_unlock_irqrestore(&skb_list_lock, flags); |
| 185 | } |
| 186 | |
| 187 | static void zap_completion_queue(void) |
| 188 | { |
| 189 | unsigned long flags; |
| 190 | struct softnet_data *sd = &get_cpu_var(softnet_data); |
| 191 | |
| 192 | if (sd->completion_queue) { |
| 193 | struct sk_buff *clist; |
| 194 | |
| 195 | local_irq_save(flags); |
| 196 | clist = sd->completion_queue; |
| 197 | sd->completion_queue = NULL; |
| 198 | local_irq_restore(flags); |
| 199 | |
| 200 | while (clist != NULL) { |
| 201 | struct sk_buff *skb = clist; |
| 202 | clist = clist->next; |
| 203 | if(skb->destructor) |
| 204 | dev_kfree_skb_any(skb); /* put this one back */ |
| 205 | else |
| 206 | __kfree_skb(skb); |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | put_cpu_var(softnet_data); |
| 211 | } |
| 212 | |
| 213 | static struct sk_buff * find_skb(struct netpoll *np, int len, int reserve) |
| 214 | { |
| 215 | int once = 1, count = 0; |
| 216 | unsigned long flags; |
| 217 | struct sk_buff *skb = NULL; |
| 218 | |
| 219 | zap_completion_queue(); |
| 220 | repeat: |
| 221 | if (nr_skbs < MAX_SKBS) |
| 222 | refill_skbs(); |
| 223 | |
| 224 | skb = alloc_skb(len, GFP_ATOMIC); |
| 225 | |
| 226 | if (!skb) { |
| 227 | spin_lock_irqsave(&skb_list_lock, flags); |
| 228 | skb = skbs; |
| 229 | if (skb) { |
| 230 | skbs = skb->next; |
| 231 | skb->next = NULL; |
| 232 | nr_skbs--; |
| 233 | } |
| 234 | spin_unlock_irqrestore(&skb_list_lock, flags); |
| 235 | } |
| 236 | |
| 237 | if(!skb) { |
| 238 | count++; |
| 239 | if (once && (count == 1000000)) { |
| 240 | printk("out of netpoll skbs!\n"); |
| 241 | once = 0; |
| 242 | } |
| 243 | netpoll_poll(np); |
| 244 | goto repeat; |
| 245 | } |
| 246 | |
| 247 | atomic_set(&skb->users, 1); |
| 248 | skb_reserve(skb, reserve); |
| 249 | return skb; |
| 250 | } |
| 251 | |
| 252 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
| 253 | { |
| 254 | int status; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 255 | struct netpoll_info *npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 257 | if (!np || !np->dev || !netif_running(np->dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | __kfree_skb(skb); |
| 259 | return; |
| 260 | } |
| 261 | |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 262 | npinfo = np->dev->npinfo; |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 263 | |
| 264 | /* avoid recursion */ |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 265 | if (npinfo->poll_owner == smp_processor_id() || |
| 266 | np->dev->xmit_lock_owner == smp_processor_id()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | if (np->drop) |
| 268 | np->drop(skb); |
| 269 | else |
| 270 | __kfree_skb(skb); |
| 271 | return; |
| 272 | } |
| 273 | |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 274 | do { |
| 275 | npinfo->tries--; |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 276 | netif_tx_lock(np->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 278 | /* |
| 279 | * network drivers do not expect to be called if the queue is |
| 280 | * stopped. |
| 281 | */ |
| 282 | if (netif_queue_stopped(np->dev)) { |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 283 | netif_tx_unlock(np->dev); |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 284 | netpoll_poll(np); |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 285 | udelay(50); |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 286 | continue; |
| 287 | } |
| 288 | |
| 289 | status = np->dev->hard_start_xmit(skb, np->dev); |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 290 | netif_tx_unlock(np->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 292 | /* success */ |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 293 | if(!status) { |
| 294 | npinfo->tries = MAX_RETRIES; /* reset */ |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 295 | return; |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 296 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 298 | /* transmit busy */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | netpoll_poll(np); |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 300 | udelay(50); |
| 301 | } while (npinfo->tries > 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) |
| 305 | { |
| 306 | int total_len, eth_len, ip_len, udp_len; |
| 307 | struct sk_buff *skb; |
| 308 | struct udphdr *udph; |
| 309 | struct iphdr *iph; |
| 310 | struct ethhdr *eth; |
| 311 | |
| 312 | udp_len = len + sizeof(*udph); |
| 313 | ip_len = eth_len = udp_len + sizeof(*iph); |
| 314 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; |
| 315 | |
| 316 | skb = find_skb(np, total_len, total_len - len); |
| 317 | if (!skb) |
| 318 | return; |
| 319 | |
| 320 | memcpy(skb->data, msg, len); |
| 321 | skb->len += len; |
| 322 | |
| 323 | udph = (struct udphdr *) skb_push(skb, sizeof(*udph)); |
| 324 | udph->source = htons(np->local_port); |
| 325 | udph->dest = htons(np->remote_port); |
| 326 | udph->len = htons(udp_len); |
| 327 | udph->check = 0; |
| 328 | |
| 329 | iph = (struct iphdr *)skb_push(skb, sizeof(*iph)); |
| 330 | |
| 331 | /* iph->version = 4; iph->ihl = 5; */ |
| 332 | put_unaligned(0x45, (unsigned char *)iph); |
| 333 | iph->tos = 0; |
| 334 | put_unaligned(htons(ip_len), &(iph->tot_len)); |
| 335 | iph->id = 0; |
| 336 | iph->frag_off = 0; |
| 337 | iph->ttl = 64; |
| 338 | iph->protocol = IPPROTO_UDP; |
| 339 | iph->check = 0; |
| 340 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); |
| 341 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); |
| 342 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
| 343 | |
| 344 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); |
| 345 | |
| 346 | eth->h_proto = htons(ETH_P_IP); |
| 347 | memcpy(eth->h_source, np->local_mac, 6); |
| 348 | memcpy(eth->h_dest, np->remote_mac, 6); |
| 349 | |
| 350 | skb->dev = np->dev; |
| 351 | |
| 352 | netpoll_send_skb(np, skb); |
| 353 | } |
| 354 | |
| 355 | static void arp_reply(struct sk_buff *skb) |
| 356 | { |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 357 | struct netpoll_info *npinfo = skb->dev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | struct arphdr *arp; |
| 359 | unsigned char *arp_ptr; |
| 360 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; |
| 361 | u32 sip, tip; |
| 362 | struct sk_buff *send_skb; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 363 | struct netpoll *np = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 365 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
| 366 | np = npinfo->rx_np; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 367 | if (!np) |
| 368 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
| 370 | /* No arp on this interface */ |
| 371 | if (skb->dev->flags & IFF_NOARP) |
| 372 | return; |
| 373 | |
| 374 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + |
| 375 | (2 * skb->dev->addr_len) + |
| 376 | (2 * sizeof(u32))))) |
| 377 | return; |
| 378 | |
| 379 | skb->h.raw = skb->nh.raw = skb->data; |
| 380 | arp = skb->nh.arph; |
| 381 | |
| 382 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && |
| 383 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || |
| 384 | arp->ar_pro != htons(ETH_P_IP) || |
| 385 | arp->ar_op != htons(ARPOP_REQUEST)) |
| 386 | return; |
| 387 | |
| 388 | arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len; |
| 389 | memcpy(&sip, arp_ptr, 4); |
| 390 | arp_ptr += 4 + skb->dev->addr_len; |
| 391 | memcpy(&tip, arp_ptr, 4); |
| 392 | |
| 393 | /* Should we ignore arp? */ |
| 394 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) |
| 395 | return; |
| 396 | |
| 397 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); |
| 398 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), |
| 399 | LL_RESERVED_SPACE(np->dev)); |
| 400 | |
| 401 | if (!send_skb) |
| 402 | return; |
| 403 | |
| 404 | send_skb->nh.raw = send_skb->data; |
| 405 | arp = (struct arphdr *) skb_put(send_skb, size); |
| 406 | send_skb->dev = skb->dev; |
| 407 | send_skb->protocol = htons(ETH_P_ARP); |
| 408 | |
| 409 | /* Fill the device header for the ARP frame */ |
| 410 | |
| 411 | if (np->dev->hard_header && |
| 412 | np->dev->hard_header(send_skb, skb->dev, ptype, |
| 413 | np->remote_mac, np->local_mac, |
| 414 | send_skb->len) < 0) { |
| 415 | kfree_skb(send_skb); |
| 416 | return; |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * Fill out the arp protocol part. |
| 421 | * |
| 422 | * we only support ethernet device type, |
| 423 | * which (according to RFC 1390) should always equal 1 (Ethernet). |
| 424 | */ |
| 425 | |
| 426 | arp->ar_hrd = htons(np->dev->type); |
| 427 | arp->ar_pro = htons(ETH_P_IP); |
| 428 | arp->ar_hln = np->dev->addr_len; |
| 429 | arp->ar_pln = 4; |
| 430 | arp->ar_op = htons(type); |
| 431 | |
| 432 | arp_ptr=(unsigned char *)(arp + 1); |
| 433 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); |
| 434 | arp_ptr += np->dev->addr_len; |
| 435 | memcpy(arp_ptr, &tip, 4); |
| 436 | arp_ptr += 4; |
| 437 | memcpy(arp_ptr, np->remote_mac, np->dev->addr_len); |
| 438 | arp_ptr += np->dev->addr_len; |
| 439 | memcpy(arp_ptr, &sip, 4); |
| 440 | |
| 441 | netpoll_send_skb(np, send_skb); |
| 442 | } |
| 443 | |
| 444 | int __netpoll_rx(struct sk_buff *skb) |
| 445 | { |
| 446 | int proto, len, ulen; |
| 447 | struct iphdr *iph; |
| 448 | struct udphdr *uh; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 449 | struct netpoll *np = skb->dev->npinfo->rx_np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 451 | if (!np) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | goto out; |
| 453 | if (skb->dev->type != ARPHRD_ETHER) |
| 454 | goto out; |
| 455 | |
| 456 | /* check if netpoll clients need ARP */ |
| 457 | if (skb->protocol == __constant_htons(ETH_P_ARP) && |
| 458 | atomic_read(&trapped)) { |
| 459 | arp_reply(skb); |
| 460 | return 1; |
| 461 | } |
| 462 | |
| 463 | proto = ntohs(eth_hdr(skb)->h_proto); |
| 464 | if (proto != ETH_P_IP) |
| 465 | goto out; |
| 466 | if (skb->pkt_type == PACKET_OTHERHOST) |
| 467 | goto out; |
| 468 | if (skb_shared(skb)) |
| 469 | goto out; |
| 470 | |
| 471 | iph = (struct iphdr *)skb->data; |
| 472 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| 473 | goto out; |
| 474 | if (iph->ihl < 5 || iph->version != 4) |
| 475 | goto out; |
| 476 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 477 | goto out; |
| 478 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) |
| 479 | goto out; |
| 480 | |
| 481 | len = ntohs(iph->tot_len); |
| 482 | if (skb->len < len || len < iph->ihl*4) |
| 483 | goto out; |
| 484 | |
| 485 | if (iph->protocol != IPPROTO_UDP) |
| 486 | goto out; |
| 487 | |
| 488 | len -= iph->ihl*4; |
| 489 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); |
| 490 | ulen = ntohs(uh->len); |
| 491 | |
| 492 | if (ulen != len) |
| 493 | goto out; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 494 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | goto out; |
| 496 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) |
| 497 | goto out; |
| 498 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) |
| 499 | goto out; |
| 500 | if (np->local_port && np->local_port != ntohs(uh->dest)) |
| 501 | goto out; |
| 502 | |
| 503 | np->rx_hook(np, ntohs(uh->source), |
| 504 | (char *)(uh+1), |
| 505 | ulen - sizeof(struct udphdr)); |
| 506 | |
| 507 | kfree_skb(skb); |
| 508 | return 1; |
| 509 | |
| 510 | out: |
| 511 | if (atomic_read(&trapped)) { |
| 512 | kfree_skb(skb); |
| 513 | return 1; |
| 514 | } |
| 515 | |
| 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | int netpoll_parse_options(struct netpoll *np, char *opt) |
| 520 | { |
| 521 | char *cur=opt, *delim; |
| 522 | |
| 523 | if(*cur != '@') { |
| 524 | if ((delim = strchr(cur, '@')) == NULL) |
| 525 | goto parse_failed; |
| 526 | *delim=0; |
| 527 | np->local_port=simple_strtol(cur, NULL, 10); |
| 528 | cur=delim; |
| 529 | } |
| 530 | cur++; |
| 531 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); |
| 532 | |
| 533 | if(*cur != '/') { |
| 534 | if ((delim = strchr(cur, '/')) == NULL) |
| 535 | goto parse_failed; |
| 536 | *delim=0; |
| 537 | np->local_ip=ntohl(in_aton(cur)); |
| 538 | cur=delim; |
| 539 | |
| 540 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", |
| 541 | np->name, HIPQUAD(np->local_ip)); |
| 542 | } |
| 543 | cur++; |
| 544 | |
| 545 | if ( *cur != ',') { |
| 546 | /* parse out dev name */ |
| 547 | if ((delim = strchr(cur, ',')) == NULL) |
| 548 | goto parse_failed; |
| 549 | *delim=0; |
| 550 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
| 551 | cur=delim; |
| 552 | } |
| 553 | cur++; |
| 554 | |
| 555 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); |
| 556 | |
| 557 | if ( *cur != '@' ) { |
| 558 | /* dst port */ |
| 559 | if ((delim = strchr(cur, '@')) == NULL) |
| 560 | goto parse_failed; |
| 561 | *delim=0; |
| 562 | np->remote_port=simple_strtol(cur, NULL, 10); |
| 563 | cur=delim; |
| 564 | } |
| 565 | cur++; |
| 566 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); |
| 567 | |
| 568 | /* dst ip */ |
| 569 | if ((delim = strchr(cur, '/')) == NULL) |
| 570 | goto parse_failed; |
| 571 | *delim=0; |
| 572 | np->remote_ip=ntohl(in_aton(cur)); |
| 573 | cur=delim+1; |
| 574 | |
| 575 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", |
| 576 | np->name, HIPQUAD(np->remote_ip)); |
| 577 | |
| 578 | if( *cur != 0 ) |
| 579 | { |
| 580 | /* MAC address */ |
| 581 | if ((delim = strchr(cur, ':')) == NULL) |
| 582 | goto parse_failed; |
| 583 | *delim=0; |
| 584 | np->remote_mac[0]=simple_strtol(cur, NULL, 16); |
| 585 | cur=delim+1; |
| 586 | if ((delim = strchr(cur, ':')) == NULL) |
| 587 | goto parse_failed; |
| 588 | *delim=0; |
| 589 | np->remote_mac[1]=simple_strtol(cur, NULL, 16); |
| 590 | cur=delim+1; |
| 591 | if ((delim = strchr(cur, ':')) == NULL) |
| 592 | goto parse_failed; |
| 593 | *delim=0; |
| 594 | np->remote_mac[2]=simple_strtol(cur, NULL, 16); |
| 595 | cur=delim+1; |
| 596 | if ((delim = strchr(cur, ':')) == NULL) |
| 597 | goto parse_failed; |
| 598 | *delim=0; |
| 599 | np->remote_mac[3]=simple_strtol(cur, NULL, 16); |
| 600 | cur=delim+1; |
| 601 | if ((delim = strchr(cur, ':')) == NULL) |
| 602 | goto parse_failed; |
| 603 | *delim=0; |
| 604 | np->remote_mac[4]=simple_strtol(cur, NULL, 16); |
| 605 | cur=delim+1; |
| 606 | np->remote_mac[5]=simple_strtol(cur, NULL, 16); |
| 607 | } |
| 608 | |
| 609 | printk(KERN_INFO "%s: remote ethernet address " |
| 610 | "%02x:%02x:%02x:%02x:%02x:%02x\n", |
| 611 | np->name, |
| 612 | np->remote_mac[0], |
| 613 | np->remote_mac[1], |
| 614 | np->remote_mac[2], |
| 615 | np->remote_mac[3], |
| 616 | np->remote_mac[4], |
| 617 | np->remote_mac[5]); |
| 618 | |
| 619 | return 0; |
| 620 | |
| 621 | parse_failed: |
| 622 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", |
| 623 | np->name, cur); |
| 624 | return -1; |
| 625 | } |
| 626 | |
| 627 | int netpoll_setup(struct netpoll *np) |
| 628 | { |
| 629 | struct net_device *ndev = NULL; |
| 630 | struct in_device *in_dev; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 631 | struct netpoll_info *npinfo; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 632 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
| 634 | if (np->dev_name) |
| 635 | ndev = dev_get_by_name(np->dev_name); |
| 636 | if (!ndev) { |
| 637 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", |
| 638 | np->name, np->dev_name); |
| 639 | return -1; |
| 640 | } |
| 641 | |
| 642 | np->dev = ndev; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 643 | if (!ndev->npinfo) { |
| 644 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
| 645 | if (!npinfo) |
| 646 | goto release; |
| 647 | |
Jeff Moyer | 1151312 | 2005-08-11 19:23:04 -0700 | [diff] [blame] | 648 | npinfo->rx_flags = 0; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 649 | npinfo->rx_np = NULL; |
Ingo Molnar | a9f6a0d | 2005-09-09 13:10:41 -0700 | [diff] [blame] | 650 | spin_lock_init(&npinfo->poll_lock); |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 651 | npinfo->poll_owner = -1; |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 652 | npinfo->tries = MAX_RETRIES; |
Ingo Molnar | a9f6a0d | 2005-09-09 13:10:41 -0700 | [diff] [blame] | 653 | spin_lock_init(&npinfo->rx_lock); |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 654 | } else |
| 655 | npinfo = ndev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | if (!ndev->poll_controller) { |
| 658 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", |
| 659 | np->name, np->dev_name); |
| 660 | goto release; |
| 661 | } |
| 662 | |
| 663 | if (!netif_running(ndev)) { |
| 664 | unsigned long atmost, atleast; |
| 665 | |
| 666 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", |
| 667 | np->name, np->dev_name); |
| 668 | |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 669 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) { |
| 671 | printk(KERN_ERR "%s: failed to open %s\n", |
| 672 | np->name, np->dev_name); |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 673 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | goto release; |
| 675 | } |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 676 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | atleast = jiffies + HZ/10; |
| 679 | atmost = jiffies + 4*HZ; |
| 680 | while (!netif_carrier_ok(ndev)) { |
| 681 | if (time_after(jiffies, atmost)) { |
| 682 | printk(KERN_NOTICE |
| 683 | "%s: timeout waiting for carrier\n", |
| 684 | np->name); |
| 685 | break; |
| 686 | } |
| 687 | cond_resched(); |
| 688 | } |
| 689 | |
| 690 | /* If carrier appears to come up instantly, we don't |
| 691 | * trust it and pause so that we don't pump all our |
| 692 | * queued console messages into the bitbucket. |
| 693 | */ |
| 694 | |
| 695 | if (time_before(jiffies, atleast)) { |
| 696 | printk(KERN_NOTICE "%s: carrier detect appears" |
| 697 | " untrustworthy, waiting 4 seconds\n", |
| 698 | np->name); |
| 699 | msleep(4000); |
| 700 | } |
| 701 | } |
| 702 | |
Kris Katterjohn | 3860288 | 2006-01-17 15:15:38 -0800 | [diff] [blame] | 703 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | memcpy(np->local_mac, ndev->dev_addr, 6); |
| 705 | |
| 706 | if (!np->local_ip) { |
| 707 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 708 | in_dev = __in_dev_get_rcu(ndev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
| 710 | if (!in_dev || !in_dev->ifa_list) { |
| 711 | rcu_read_unlock(); |
| 712 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", |
| 713 | np->name, np->dev_name); |
| 714 | goto release; |
| 715 | } |
| 716 | |
| 717 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); |
| 718 | rcu_read_unlock(); |
| 719 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", |
| 720 | np->name, HIPQUAD(np->local_ip)); |
| 721 | } |
| 722 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 723 | if (np->rx_hook) { |
| 724 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
| 725 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
| 726 | npinfo->rx_np = np; |
| 727 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 728 | } |
Ingo Molnar | 2652076 | 2005-08-11 19:26:42 -0700 | [diff] [blame] | 729 | |
| 730 | /* fill up the skb queue */ |
| 731 | refill_skbs(); |
| 732 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 733 | /* last thing to do is link it to the net device structure */ |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 734 | ndev->npinfo = npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 736 | /* avoid racing with NAPI reading npinfo */ |
| 737 | synchronize_rcu(); |
| 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | return 0; |
| 740 | |
| 741 | release: |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 742 | if (!ndev->npinfo) |
| 743 | kfree(npinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | np->dev = NULL; |
| 745 | dev_put(ndev); |
| 746 | return -1; |
| 747 | } |
| 748 | |
| 749 | void netpoll_cleanup(struct netpoll *np) |
| 750 | { |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 751 | struct netpoll_info *npinfo; |
| 752 | unsigned long flags; |
| 753 | |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 754 | if (np->dev) { |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 755 | npinfo = np->dev->npinfo; |
| 756 | if (npinfo && npinfo->rx_np == np) { |
| 757 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
| 758 | npinfo->rx_np = NULL; |
| 759 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; |
| 760 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 761 | } |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 762 | dev_put(np->dev); |
| 763 | } |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | np->dev = NULL; |
| 766 | } |
| 767 | |
| 768 | int netpoll_trap(void) |
| 769 | { |
| 770 | return atomic_read(&trapped); |
| 771 | } |
| 772 | |
| 773 | void netpoll_set_trap(int trap) |
| 774 | { |
| 775 | if (trap) |
| 776 | atomic_inc(&trapped); |
| 777 | else |
| 778 | atomic_dec(&trapped); |
| 779 | } |
| 780 | |
| 781 | EXPORT_SYMBOL(netpoll_set_trap); |
| 782 | EXPORT_SYMBOL(netpoll_trap); |
| 783 | EXPORT_SYMBOL(netpoll_parse_options); |
| 784 | EXPORT_SYMBOL(netpoll_setup); |
| 785 | EXPORT_SYMBOL(netpoll_cleanup); |
| 786 | EXPORT_SYMBOL(netpoll_send_udp); |
| 787 | EXPORT_SYMBOL(netpoll_poll); |
| 788 | EXPORT_SYMBOL(netpoll_queue); |