Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
12 | #include <linux/netdevice.h> |
13 | #include <linux/etherdevice.h> | |
14 | #include <linux/string.h> | |
14c85021 | 15 | #include <linux/if_arp.h> |
1da177e4 LT |
16 | #include <linux/inetdevice.h> |
17 | #include <linux/inet.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/netpoll.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/rcupdate.h> | |
23 | #include <linux/workqueue.h> | |
24 | #include <net/tcp.h> | |
25 | #include <net/udp.h> | |
26 | #include <asm/unaligned.h> | |
27 | ||
28 | /* | |
29 | * We maintain a small pool of fully-sized skbs, to make sure the | |
30 | * message gets out even in extreme OOM situations. | |
31 | */ | |
32 | ||
33 | #define MAX_UDP_CHUNK 1460 | |
34 | #define MAX_SKBS 32 | |
35 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) | |
36 | ||
a1bcfacd | 37 | static struct sk_buff_head skb_pool; |
1da177e4 LT |
38 | |
39 | static atomic_t trapped; | |
40 | ||
2bdfe0ba | 41 | #define USEC_PER_POLL 50 |
1da177e4 LT |
42 | #define NETPOLL_RX_ENABLED 1 |
43 | #define NETPOLL_RX_DROP 2 | |
44 | ||
45 | #define MAX_SKB_SIZE \ | |
46 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
47 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
48 | ||
49 | static void zap_completion_queue(void); | |
068c6e98 | 50 | static void arp_reply(struct sk_buff *skb); |
1da177e4 | 51 | |
c4028958 | 52 | static void queue_process(struct work_struct *work) |
1da177e4 | 53 | { |
4c1ac1b4 DH |
54 | struct netpoll_info *npinfo = |
55 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 56 | struct sk_buff *skb; |
3640543d | 57 | unsigned long flags; |
1da177e4 | 58 | |
6c43ff18 SH |
59 | while ((skb = skb_dequeue(&npinfo->txq))) { |
60 | struct net_device *dev = skb->dev; | |
1da177e4 | 61 | |
6c43ff18 SH |
62 | if (!netif_device_present(dev) || !netif_running(dev)) { |
63 | __kfree_skb(skb); | |
64 | continue; | |
65 | } | |
1da177e4 | 66 | |
3640543d IM |
67 | local_irq_save(flags); |
68 | netif_tx_lock(dev); | |
f25f4e44 PWJ |
69 | if ((netif_queue_stopped(dev) || |
70 | netif_subqueue_stopped(dev, skb->queue_mapping)) || | |
71 | dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) { | |
6c43ff18 | 72 | skb_queue_head(&npinfo->txq, skb); |
3640543d IM |
73 | netif_tx_unlock(dev); |
74 | local_irq_restore(flags); | |
1da177e4 | 75 | |
25442caf | 76 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
77 | return; |
78 | } | |
3640543d IM |
79 | netif_tx_unlock(dev); |
80 | local_irq_restore(flags); | |
1da177e4 | 81 | } |
1da177e4 LT |
82 | } |
83 | ||
b51655b9 AV |
84 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
85 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 86 | { |
d6f5493c | 87 | __wsum psum; |
fb286bb2 | 88 | |
60476372 | 89 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
90 | return 0; |
91 | ||
fb286bb2 HX |
92 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
93 | ||
84fa7933 | 94 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 95 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 96 | return 0; |
1da177e4 | 97 | |
fb286bb2 | 98 | skb->csum = psum; |
1da177e4 | 99 | |
fb286bb2 | 100 | return __skb_checksum_complete(skb); |
1da177e4 LT |
101 | } |
102 | ||
103 | /* | |
104 | * Check whether delayed processing was scheduled for our NIC. If so, | |
105 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
106 | * If this fails, either we've recursed in ->poll() or it's already | |
107 | * running on another CPU. | |
108 | * | |
109 | * Note: we don't mask interrupts with this lock because we're using | |
110 | * trylock here and interrupts are already disabled in the softirq | |
111 | * case. Further, we test the poll_owner to avoid recursion on UP | |
112 | * systems where the lock doesn't exist. | |
113 | * | |
114 | * In cases where there is bi-directional communications, reading only | |
115 | * one message at a time can lead to packets being dropped by the | |
116 | * network adapter, forcing superfluous retries and possibly timeouts. | |
117 | * Thus, we set our budget to greater than 1. | |
118 | */ | |
119 | static void poll_napi(struct netpoll *np) | |
120 | { | |
115c1d6e | 121 | struct netpoll_info *npinfo = np->dev->npinfo; |
1da177e4 LT |
122 | int budget = 16; |
123 | ||
124 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
115c1d6e JM |
125 | npinfo->poll_owner != smp_processor_id() && |
126 | spin_trylock(&npinfo->poll_lock)) { | |
127 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
1da177e4 LT |
128 | atomic_inc(&trapped); |
129 | ||
130 | np->dev->poll(np->dev, &budget); | |
131 | ||
132 | atomic_dec(&trapped); | |
115c1d6e JM |
133 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
134 | spin_unlock(&npinfo->poll_lock); | |
1da177e4 LT |
135 | } |
136 | } | |
137 | ||
068c6e98 NH |
138 | static void service_arp_queue(struct netpoll_info *npi) |
139 | { | |
140 | struct sk_buff *skb; | |
141 | ||
142 | if (unlikely(!npi)) | |
143 | return; | |
144 | ||
145 | skb = skb_dequeue(&npi->arp_tx); | |
146 | ||
147 | while (skb != NULL) { | |
148 | arp_reply(skb); | |
149 | skb = skb_dequeue(&npi->arp_tx); | |
150 | } | |
068c6e98 NH |
151 | } |
152 | ||
1da177e4 LT |
153 | void netpoll_poll(struct netpoll *np) |
154 | { | |
c68b9070 | 155 | if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) |
1da177e4 LT |
156 | return; |
157 | ||
158 | /* Process pending work on NIC */ | |
159 | np->dev->poll_controller(np->dev); | |
160 | if (np->dev->poll) | |
161 | poll_napi(np); | |
162 | ||
068c6e98 NH |
163 | service_arp_queue(np->dev->npinfo); |
164 | ||
1da177e4 LT |
165 | zap_completion_queue(); |
166 | } | |
167 | ||
168 | static void refill_skbs(void) | |
169 | { | |
170 | struct sk_buff *skb; | |
171 | unsigned long flags; | |
172 | ||
a1bcfacd SH |
173 | spin_lock_irqsave(&skb_pool.lock, flags); |
174 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
175 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
176 | if (!skb) | |
177 | break; | |
178 | ||
a1bcfacd | 179 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 180 | } |
a1bcfacd | 181 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
182 | } |
183 | ||
184 | static void zap_completion_queue(void) | |
185 | { | |
186 | unsigned long flags; | |
187 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
188 | ||
189 | if (sd->completion_queue) { | |
190 | struct sk_buff *clist; | |
191 | ||
192 | local_irq_save(flags); | |
193 | clist = sd->completion_queue; | |
194 | sd->completion_queue = NULL; | |
195 | local_irq_restore(flags); | |
196 | ||
197 | while (clist != NULL) { | |
198 | struct sk_buff *skb = clist; | |
199 | clist = clist->next; | |
c68b9070 | 200 | if (skb->destructor) |
1da177e4 LT |
201 | dev_kfree_skb_any(skb); /* put this one back */ |
202 | else | |
203 | __kfree_skb(skb); | |
204 | } | |
205 | } | |
206 | ||
207 | put_cpu_var(softnet_data); | |
208 | } | |
209 | ||
a1bcfacd | 210 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 211 | { |
a1bcfacd SH |
212 | int count = 0; |
213 | struct sk_buff *skb; | |
1da177e4 LT |
214 | |
215 | zap_completion_queue(); | |
a1bcfacd | 216 | refill_skbs(); |
1da177e4 | 217 | repeat: |
1da177e4 LT |
218 | |
219 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
220 | if (!skb) |
221 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
222 | |
223 | if (!skb) { | |
a1bcfacd SH |
224 | if (++count < 10) { |
225 | netpoll_poll(np); | |
226 | goto repeat; | |
1da177e4 | 227 | } |
a1bcfacd | 228 | return NULL; |
1da177e4 LT |
229 | } |
230 | ||
231 | atomic_set(&skb->users, 1); | |
232 | skb_reserve(skb, reserve); | |
233 | return skb; | |
234 | } | |
235 | ||
236 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
237 | { | |
2bdfe0ba SH |
238 | int status = NETDEV_TX_BUSY; |
239 | unsigned long tries; | |
4ec93edb YH |
240 | struct net_device *dev = np->dev; |
241 | struct netpoll_info *npinfo = np->dev->npinfo; | |
2bdfe0ba | 242 | |
4ec93edb YH |
243 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
244 | __kfree_skb(skb); | |
245 | return; | |
246 | } | |
2bdfe0ba SH |
247 | |
248 | /* don't get messages out of order, and no recursion */ | |
c68b9070 | 249 | if (skb_queue_len(&npinfo->txq) == 0 && |
e37b8d93 | 250 | npinfo->poll_owner != smp_processor_id()) { |
a49f99ff AM |
251 | unsigned long flags; |
252 | ||
253 | local_irq_save(flags); | |
0db3dc73 SH |
254 | /* try until next clock tick */ |
255 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
256 | tries > 0; --tries) { | |
257 | if (netif_tx_trylock(dev)) { | |
f25f4e44 PWJ |
258 | if (!netif_queue_stopped(dev) && |
259 | !netif_subqueue_stopped(dev, skb->queue_mapping)) | |
e37b8d93 | 260 | status = dev->hard_start_xmit(skb, dev); |
0db3dc73 | 261 | netif_tx_unlock(dev); |
e37b8d93 AM |
262 | |
263 | if (status == NETDEV_TX_OK) | |
264 | break; | |
265 | ||
e37b8d93 | 266 | } |
0db3dc73 SH |
267 | |
268 | /* tickle device maybe there is some cleanup */ | |
269 | netpoll_poll(np); | |
270 | ||
271 | udelay(USEC_PER_POLL); | |
0db1d6fc | 272 | } |
a49f99ff | 273 | local_irq_restore(flags); |
1da177e4 | 274 | } |
1da177e4 | 275 | |
2bdfe0ba | 276 | if (status != NETDEV_TX_OK) { |
5de4a473 | 277 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 278 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 279 | } |
1da177e4 LT |
280 | } |
281 | ||
282 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
283 | { | |
284 | int total_len, eth_len, ip_len, udp_len; | |
285 | struct sk_buff *skb; | |
286 | struct udphdr *udph; | |
287 | struct iphdr *iph; | |
288 | struct ethhdr *eth; | |
289 | ||
290 | udp_len = len + sizeof(*udph); | |
291 | ip_len = eth_len = udp_len + sizeof(*iph); | |
292 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
293 | ||
294 | skb = find_skb(np, total_len, total_len - len); | |
295 | if (!skb) | |
296 | return; | |
297 | ||
27d7ff46 | 298 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
299 | skb->len += len; |
300 | ||
4bedb452 ACM |
301 | skb_push(skb, sizeof(*udph)); |
302 | skb_reset_transport_header(skb); | |
303 | udph = udp_hdr(skb); | |
1da177e4 LT |
304 | udph->source = htons(np->local_port); |
305 | udph->dest = htons(np->remote_port); | |
306 | udph->len = htons(udp_len); | |
307 | udph->check = 0; | |
8e365eec CL |
308 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
309 | htonl(np->remote_ip), | |
310 | udp_len, IPPROTO_UDP, | |
311 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
312 | if (udph->check == 0) | |
5e57dff2 | 313 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 314 | |
e2d1bca7 ACM |
315 | skb_push(skb, sizeof(*iph)); |
316 | skb_reset_network_header(skb); | |
eddc9ec5 | 317 | iph = ip_hdr(skb); |
1da177e4 LT |
318 | |
319 | /* iph->version = 4; iph->ihl = 5; */ | |
320 | put_unaligned(0x45, (unsigned char *)iph); | |
321 | iph->tos = 0; | |
322 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
323 | iph->id = 0; | |
324 | iph->frag_off = 0; | |
325 | iph->ttl = 64; | |
326 | iph->protocol = IPPROTO_UDP; | |
327 | iph->check = 0; | |
328 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
329 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
330 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
331 | ||
332 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 333 | skb_reset_mac_header(skb); |
206daaf7 | 334 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
1da177e4 LT |
335 | memcpy(eth->h_source, np->local_mac, 6); |
336 | memcpy(eth->h_dest, np->remote_mac, 6); | |
337 | ||
338 | skb->dev = np->dev; | |
339 | ||
340 | netpoll_send_skb(np, skb); | |
341 | } | |
342 | ||
343 | static void arp_reply(struct sk_buff *skb) | |
344 | { | |
115c1d6e | 345 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
346 | struct arphdr *arp; |
347 | unsigned char *arp_ptr; | |
348 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 349 | __be32 sip, tip; |
47bbec02 | 350 | unsigned char *sha; |
1da177e4 | 351 | struct sk_buff *send_skb; |
115c1d6e | 352 | struct netpoll *np = NULL; |
1da177e4 | 353 | |
fbeec2e1 JM |
354 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
355 | np = npinfo->rx_np; | |
115c1d6e JM |
356 | if (!np) |
357 | return; | |
1da177e4 LT |
358 | |
359 | /* No arp on this interface */ | |
360 | if (skb->dev->flags & IFF_NOARP) | |
361 | return; | |
362 | ||
363 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
364 | (2 * skb->dev->addr_len) + | |
365 | (2 * sizeof(u32))))) | |
366 | return; | |
367 | ||
c1d2bbe1 | 368 | skb_reset_network_header(skb); |
badff6d0 | 369 | skb_reset_transport_header(skb); |
d0a92be0 | 370 | arp = arp_hdr(skb); |
1da177e4 LT |
371 | |
372 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
373 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
374 | arp->ar_pro != htons(ETH_P_IP) || | |
375 | arp->ar_op != htons(ARPOP_REQUEST)) | |
376 | return; | |
377 | ||
47bbec02 NH |
378 | arp_ptr = (unsigned char *)(arp+1); |
379 | /* save the location of the src hw addr */ | |
380 | sha = arp_ptr; | |
381 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 382 | memcpy(&sip, arp_ptr, 4); |
47bbec02 NH |
383 | arp_ptr += 4; |
384 | /* if we actually cared about dst hw addr, it would get copied here */ | |
385 | arp_ptr += skb->dev->addr_len; | |
1da177e4 LT |
386 | memcpy(&tip, arp_ptr, 4); |
387 | ||
388 | /* Should we ignore arp? */ | |
389 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
390 | return; | |
391 | ||
392 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
393 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
394 | LL_RESERVED_SPACE(np->dev)); | |
395 | ||
396 | if (!send_skb) | |
397 | return; | |
398 | ||
c1d2bbe1 | 399 | skb_reset_network_header(send_skb); |
1da177e4 LT |
400 | arp = (struct arphdr *) skb_put(send_skb, size); |
401 | send_skb->dev = skb->dev; | |
402 | send_skb->protocol = htons(ETH_P_ARP); | |
403 | ||
404 | /* Fill the device header for the ARP frame */ | |
405 | ||
406 | if (np->dev->hard_header && | |
407 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
47bbec02 | 408 | sha, np->local_mac, |
c68b9070 | 409 | send_skb->len) < 0) { |
1da177e4 LT |
410 | kfree_skb(send_skb); |
411 | return; | |
412 | } | |
413 | ||
414 | /* | |
415 | * Fill out the arp protocol part. | |
416 | * | |
417 | * we only support ethernet device type, | |
418 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
419 | */ | |
420 | ||
421 | arp->ar_hrd = htons(np->dev->type); | |
422 | arp->ar_pro = htons(ETH_P_IP); | |
423 | arp->ar_hln = np->dev->addr_len; | |
424 | arp->ar_pln = 4; | |
425 | arp->ar_op = htons(type); | |
426 | ||
427 | arp_ptr=(unsigned char *)(arp + 1); | |
428 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
429 | arp_ptr += np->dev->addr_len; | |
430 | memcpy(arp_ptr, &tip, 4); | |
431 | arp_ptr += 4; | |
47bbec02 | 432 | memcpy(arp_ptr, sha, np->dev->addr_len); |
1da177e4 LT |
433 | arp_ptr += np->dev->addr_len; |
434 | memcpy(arp_ptr, &sip, 4); | |
435 | ||
436 | netpoll_send_skb(np, send_skb); | |
437 | } | |
438 | ||
439 | int __netpoll_rx(struct sk_buff *skb) | |
440 | { | |
441 | int proto, len, ulen; | |
442 | struct iphdr *iph; | |
443 | struct udphdr *uh; | |
068c6e98 NH |
444 | struct netpoll_info *npi = skb->dev->npinfo; |
445 | struct netpoll *np = npi->rx_np; | |
446 | ||
fbeec2e1 | 447 | if (!np) |
1da177e4 LT |
448 | goto out; |
449 | if (skb->dev->type != ARPHRD_ETHER) | |
450 | goto out; | |
451 | ||
452 | /* check if netpoll clients need ARP */ | |
724800d6 | 453 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 454 | atomic_read(&trapped)) { |
068c6e98 | 455 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
456 | return 1; |
457 | } | |
458 | ||
459 | proto = ntohs(eth_hdr(skb)->h_proto); | |
460 | if (proto != ETH_P_IP) | |
461 | goto out; | |
462 | if (skb->pkt_type == PACKET_OTHERHOST) | |
463 | goto out; | |
464 | if (skb_shared(skb)) | |
465 | goto out; | |
466 | ||
467 | iph = (struct iphdr *)skb->data; | |
468 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
469 | goto out; | |
470 | if (iph->ihl < 5 || iph->version != 4) | |
471 | goto out; | |
472 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
473 | goto out; | |
474 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
475 | goto out; | |
476 | ||
477 | len = ntohs(iph->tot_len); | |
478 | if (skb->len < len || len < iph->ihl*4) | |
479 | goto out; | |
480 | ||
5e7d7fa5 AL |
481 | /* |
482 | * Our transport medium may have padded the buffer out. | |
483 | * Now We trim to the true length of the frame. | |
484 | */ | |
485 | if (pskb_trim_rcsum(skb, len)) | |
486 | goto out; | |
487 | ||
1da177e4 LT |
488 | if (iph->protocol != IPPROTO_UDP) |
489 | goto out; | |
490 | ||
491 | len -= iph->ihl*4; | |
492 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
493 | ulen = ntohs(uh->len); | |
494 | ||
495 | if (ulen != len) | |
496 | goto out; | |
fb286bb2 | 497 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
498 | goto out; |
499 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
500 | goto out; | |
501 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
502 | goto out; | |
503 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
504 | goto out; | |
505 | ||
506 | np->rx_hook(np, ntohs(uh->source), | |
507 | (char *)(uh+1), | |
508 | ulen - sizeof(struct udphdr)); | |
509 | ||
510 | kfree_skb(skb); | |
511 | return 1; | |
512 | ||
513 | out: | |
514 | if (atomic_read(&trapped)) { | |
515 | kfree_skb(skb); | |
516 | return 1; | |
517 | } | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
523 | { | |
524 | char *cur=opt, *delim; | |
525 | ||
c68b9070 | 526 | if (*cur != '@') { |
1da177e4 LT |
527 | if ((delim = strchr(cur, '@')) == NULL) |
528 | goto parse_failed; | |
c68b9070 DM |
529 | *delim = 0; |
530 | np->local_port = simple_strtol(cur, NULL, 10); | |
531 | cur = delim; | |
1da177e4 LT |
532 | } |
533 | cur++; | |
534 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
535 | ||
c68b9070 | 536 | if (*cur != '/') { |
1da177e4 LT |
537 | if ((delim = strchr(cur, '/')) == NULL) |
538 | goto parse_failed; | |
c68b9070 DM |
539 | *delim = 0; |
540 | np->local_ip = ntohl(in_aton(cur)); | |
541 | cur = delim; | |
1da177e4 LT |
542 | |
543 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
544 | np->name, HIPQUAD(np->local_ip)); | |
545 | } | |
546 | cur++; | |
547 | ||
c68b9070 | 548 | if (*cur != ',') { |
1da177e4 LT |
549 | /* parse out dev name */ |
550 | if ((delim = strchr(cur, ',')) == NULL) | |
551 | goto parse_failed; | |
c68b9070 | 552 | *delim = 0; |
1da177e4 | 553 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 554 | cur = delim; |
1da177e4 LT |
555 | } |
556 | cur++; | |
557 | ||
558 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
559 | ||
c68b9070 | 560 | if (*cur != '@') { |
1da177e4 LT |
561 | /* dst port */ |
562 | if ((delim = strchr(cur, '@')) == NULL) | |
563 | goto parse_failed; | |
c68b9070 DM |
564 | *delim = 0; |
565 | np->remote_port = simple_strtol(cur, NULL, 10); | |
566 | cur = delim; | |
1da177e4 LT |
567 | } |
568 | cur++; | |
569 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
570 | ||
571 | /* dst ip */ | |
572 | if ((delim = strchr(cur, '/')) == NULL) | |
573 | goto parse_failed; | |
c68b9070 DM |
574 | *delim = 0; |
575 | np->remote_ip = ntohl(in_aton(cur)); | |
576 | cur = delim + 1; | |
1da177e4 LT |
577 | |
578 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
c68b9070 | 579 | np->name, HIPQUAD(np->remote_ip)); |
1da177e4 | 580 | |
c68b9070 | 581 | if (*cur != 0) { |
1da177e4 LT |
582 | /* MAC address */ |
583 | if ((delim = strchr(cur, ':')) == NULL) | |
584 | goto parse_failed; | |
c68b9070 DM |
585 | *delim = 0; |
586 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
587 | cur = delim + 1; | |
1da177e4 LT |
588 | if ((delim = strchr(cur, ':')) == NULL) |
589 | goto parse_failed; | |
c68b9070 DM |
590 | *delim = 0; |
591 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
592 | cur = delim + 1; | |
1da177e4 LT |
593 | if ((delim = strchr(cur, ':')) == NULL) |
594 | goto parse_failed; | |
c68b9070 DM |
595 | *delim = 0; |
596 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
597 | cur = delim + 1; | |
1da177e4 LT |
598 | if ((delim = strchr(cur, ':')) == NULL) |
599 | goto parse_failed; | |
c68b9070 DM |
600 | *delim = 0; |
601 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
602 | cur = delim + 1; | |
1da177e4 LT |
603 | if ((delim = strchr(cur, ':')) == NULL) |
604 | goto parse_failed; | |
c68b9070 DM |
605 | *delim = 0; |
606 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
607 | cur = delim + 1; | |
608 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
609 | } |
610 | ||
611 | printk(KERN_INFO "%s: remote ethernet address " | |
612 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
613 | np->name, | |
614 | np->remote_mac[0], | |
615 | np->remote_mac[1], | |
616 | np->remote_mac[2], | |
617 | np->remote_mac[3], | |
618 | np->remote_mac[4], | |
619 | np->remote_mac[5]); | |
620 | ||
621 | return 0; | |
622 | ||
623 | parse_failed: | |
624 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
625 | np->name, cur); | |
626 | return -1; | |
627 | } | |
628 | ||
629 | int netpoll_setup(struct netpoll *np) | |
630 | { | |
631 | struct net_device *ndev = NULL; | |
632 | struct in_device *in_dev; | |
115c1d6e | 633 | struct netpoll_info *npinfo; |
fbeec2e1 | 634 | unsigned long flags; |
b41848b6 | 635 | int err; |
1da177e4 LT |
636 | |
637 | if (np->dev_name) | |
638 | ndev = dev_get_by_name(np->dev_name); | |
639 | if (!ndev) { | |
640 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
641 | np->name, np->dev_name); | |
b41848b6 | 642 | return -ENODEV; |
1da177e4 LT |
643 | } |
644 | ||
645 | np->dev = ndev; | |
115c1d6e JM |
646 | if (!ndev->npinfo) { |
647 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
648 | if (!npinfo) { |
649 | err = -ENOMEM; | |
115c1d6e | 650 | goto release; |
b41848b6 | 651 | } |
115c1d6e | 652 | |
11513128 | 653 | npinfo->rx_flags = 0; |
fbeec2e1 | 654 | npinfo->rx_np = NULL; |
a9f6a0dd | 655 | spin_lock_init(&npinfo->poll_lock); |
115c1d6e | 656 | npinfo->poll_owner = -1; |
2bdfe0ba | 657 | |
a9f6a0dd | 658 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 659 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 660 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 661 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 662 | |
93ec2c72 SH |
663 | atomic_set(&npinfo->refcnt, 1); |
664 | } else { | |
115c1d6e | 665 | npinfo = ndev->npinfo; |
93ec2c72 SH |
666 | atomic_inc(&npinfo->refcnt); |
667 | } | |
1da177e4 LT |
668 | |
669 | if (!ndev->poll_controller) { | |
670 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
671 | np->name, np->dev_name); | |
b41848b6 | 672 | err = -ENOTSUPP; |
1da177e4 LT |
673 | goto release; |
674 | } | |
675 | ||
676 | if (!netif_running(ndev)) { | |
677 | unsigned long atmost, atleast; | |
678 | ||
679 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
680 | np->name, np->dev_name); | |
681 | ||
6756ae4b | 682 | rtnl_lock(); |
b41848b6 SH |
683 | err = dev_open(ndev); |
684 | rtnl_unlock(); | |
685 | ||
686 | if (err) { | |
1da177e4 | 687 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 688 | np->name, ndev->name); |
1da177e4 LT |
689 | goto release; |
690 | } | |
1da177e4 LT |
691 | |
692 | atleast = jiffies + HZ/10; | |
4ec93edb | 693 | atmost = jiffies + 4*HZ; |
1da177e4 LT |
694 | while (!netif_carrier_ok(ndev)) { |
695 | if (time_after(jiffies, atmost)) { | |
696 | printk(KERN_NOTICE | |
697 | "%s: timeout waiting for carrier\n", | |
698 | np->name); | |
699 | break; | |
700 | } | |
701 | cond_resched(); | |
702 | } | |
703 | ||
704 | /* If carrier appears to come up instantly, we don't | |
705 | * trust it and pause so that we don't pump all our | |
706 | * queued console messages into the bitbucket. | |
707 | */ | |
708 | ||
709 | if (time_before(jiffies, atleast)) { | |
710 | printk(KERN_NOTICE "%s: carrier detect appears" | |
711 | " untrustworthy, waiting 4 seconds\n", | |
712 | np->name); | |
713 | msleep(4000); | |
714 | } | |
715 | } | |
716 | ||
3860288e | 717 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
1da177e4 LT |
718 | memcpy(np->local_mac, ndev->dev_addr, 6); |
719 | ||
720 | if (!np->local_ip) { | |
721 | rcu_read_lock(); | |
e5ed6399 | 722 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
723 | |
724 | if (!in_dev || !in_dev->ifa_list) { | |
725 | rcu_read_unlock(); | |
726 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
727 | np->name, np->dev_name); | |
b41848b6 | 728 | err = -EDESTADDRREQ; |
1da177e4 LT |
729 | goto release; |
730 | } | |
731 | ||
732 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
733 | rcu_read_unlock(); | |
734 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
735 | np->name, HIPQUAD(np->local_ip)); | |
736 | } | |
737 | ||
fbeec2e1 JM |
738 | if (np->rx_hook) { |
739 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
740 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
741 | npinfo->rx_np = np; | |
742 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
743 | } | |
26520765 IM |
744 | |
745 | /* fill up the skb queue */ | |
746 | refill_skbs(); | |
747 | ||
fbeec2e1 | 748 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 749 | ndev->npinfo = npinfo; |
1da177e4 | 750 | |
53fb95d3 MM |
751 | /* avoid racing with NAPI reading npinfo */ |
752 | synchronize_rcu(); | |
753 | ||
1da177e4 LT |
754 | return 0; |
755 | ||
756 | release: | |
115c1d6e JM |
757 | if (!ndev->npinfo) |
758 | kfree(npinfo); | |
1da177e4 LT |
759 | np->dev = NULL; |
760 | dev_put(ndev); | |
b41848b6 | 761 | return err; |
1da177e4 LT |
762 | } |
763 | ||
c68b9070 DM |
764 | static int __init netpoll_init(void) |
765 | { | |
a1bcfacd SH |
766 | skb_queue_head_init(&skb_pool); |
767 | return 0; | |
768 | } | |
769 | core_initcall(netpoll_init); | |
770 | ||
1da177e4 LT |
771 | void netpoll_cleanup(struct netpoll *np) |
772 | { | |
fbeec2e1 JM |
773 | struct netpoll_info *npinfo; |
774 | unsigned long flags; | |
775 | ||
115c1d6e | 776 | if (np->dev) { |
fbeec2e1 | 777 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
778 | if (npinfo) { |
779 | if (npinfo->rx_np == np) { | |
780 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
781 | npinfo->rx_np = NULL; | |
782 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
783 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
784 | } | |
785 | ||
786 | np->dev->npinfo = NULL; | |
787 | if (atomic_dec_and_test(&npinfo->refcnt)) { | |
788 | skb_queue_purge(&npinfo->arp_tx); | |
4ec93edb | 789 | skb_queue_purge(&npinfo->txq); |
25442caf | 790 | cancel_rearming_delayed_work(&npinfo->tx_work); |
93ec2c72 | 791 | |
17200811 JP |
792 | /* clean after last, unfinished work */ |
793 | if (!skb_queue_empty(&npinfo->txq)) { | |
794 | struct sk_buff *skb; | |
795 | skb = __skb_dequeue(&npinfo->txq); | |
796 | kfree_skb(skb); | |
797 | } | |
93ec2c72 SH |
798 | kfree(npinfo); |
799 | } | |
fbeec2e1 | 800 | } |
93ec2c72 | 801 | |
115c1d6e JM |
802 | dev_put(np->dev); |
803 | } | |
fbeec2e1 | 804 | |
1da177e4 LT |
805 | np->dev = NULL; |
806 | } | |
807 | ||
808 | int netpoll_trap(void) | |
809 | { | |
810 | return atomic_read(&trapped); | |
811 | } | |
812 | ||
813 | void netpoll_set_trap(int trap) | |
814 | { | |
815 | if (trap) | |
816 | atomic_inc(&trapped); | |
817 | else | |
818 | atomic_dec(&trapped); | |
819 | } | |
820 | ||
821 | EXPORT_SYMBOL(netpoll_set_trap); | |
822 | EXPORT_SYMBOL(netpoll_trap); | |
823 | EXPORT_SYMBOL(netpoll_parse_options); | |
824 | EXPORT_SYMBOL(netpoll_setup); | |
825 | EXPORT_SYMBOL(netpoll_cleanup); | |
826 | EXPORT_SYMBOL(netpoll_send_udp); | |
827 | EXPORT_SYMBOL(netpoll_poll); |