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Commit | Line | Data |
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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 | |
43 | #define MAX_SKB_SIZE \ | |
44 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
45 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
46 | ||
47 | static void zap_completion_queue(void); | |
068c6e98 | 48 | static void arp_reply(struct sk_buff *skb); |
1da177e4 | 49 | |
c4028958 | 50 | static void queue_process(struct work_struct *work) |
1da177e4 | 51 | { |
4c1ac1b4 DH |
52 | struct netpoll_info *npinfo = |
53 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 54 | struct sk_buff *skb; |
3640543d | 55 | unsigned long flags; |
1da177e4 | 56 | |
6c43ff18 SH |
57 | while ((skb = skb_dequeue(&npinfo->txq))) { |
58 | struct net_device *dev = skb->dev; | |
1da177e4 | 59 | |
6c43ff18 SH |
60 | if (!netif_device_present(dev) || !netif_running(dev)) { |
61 | __kfree_skb(skb); | |
62 | continue; | |
63 | } | |
1da177e4 | 64 | |
3640543d IM |
65 | local_irq_save(flags); |
66 | netif_tx_lock(dev); | |
f25f4e44 | 67 | if ((netif_queue_stopped(dev) || |
668f895a | 68 | netif_subqueue_stopped(dev, skb)) || |
f25f4e44 | 69 | dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) { |
6c43ff18 | 70 | skb_queue_head(&npinfo->txq, skb); |
3640543d IM |
71 | netif_tx_unlock(dev); |
72 | local_irq_restore(flags); | |
1da177e4 | 73 | |
25442caf | 74 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
75 | return; |
76 | } | |
3640543d IM |
77 | netif_tx_unlock(dev); |
78 | local_irq_restore(flags); | |
1da177e4 | 79 | } |
1da177e4 LT |
80 | } |
81 | ||
b51655b9 AV |
82 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
83 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 84 | { |
d6f5493c | 85 | __wsum psum; |
fb286bb2 | 86 | |
60476372 | 87 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
88 | return 0; |
89 | ||
fb286bb2 HX |
90 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
91 | ||
84fa7933 | 92 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 93 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 94 | return 0; |
1da177e4 | 95 | |
fb286bb2 | 96 | skb->csum = psum; |
1da177e4 | 97 | |
fb286bb2 | 98 | return __skb_checksum_complete(skb); |
1da177e4 LT |
99 | } |
100 | ||
101 | /* | |
102 | * Check whether delayed processing was scheduled for our NIC. If so, | |
103 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
104 | * If this fails, either we've recursed in ->poll() or it's already | |
105 | * running on another CPU. | |
106 | * | |
107 | * Note: we don't mask interrupts with this lock because we're using | |
108 | * trylock here and interrupts are already disabled in the softirq | |
109 | * case. Further, we test the poll_owner to avoid recursion on UP | |
110 | * systems where the lock doesn't exist. | |
111 | * | |
112 | * In cases where there is bi-directional communications, reading only | |
113 | * one message at a time can lead to packets being dropped by the | |
114 | * network adapter, forcing superfluous retries and possibly timeouts. | |
115 | * Thus, we set our budget to greater than 1. | |
116 | */ | |
0a7606c1 DM |
117 | static int poll_one_napi(struct netpoll_info *npinfo, |
118 | struct napi_struct *napi, int budget) | |
119 | { | |
120 | int work; | |
121 | ||
122 | /* net_rx_action's ->poll() invocations and our's are | |
123 | * synchronized by this test which is only made while | |
124 | * holding the napi->poll_lock. | |
125 | */ | |
126 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
127 | return budget; | |
128 | ||
0a7606c1 DM |
129 | atomic_inc(&trapped); |
130 | ||
131 | work = napi->poll(napi, budget); | |
132 | ||
133 | atomic_dec(&trapped); | |
0a7606c1 DM |
134 | |
135 | return budget - work; | |
136 | } | |
137 | ||
5106930b | 138 | static void poll_napi(struct net_device *dev) |
1da177e4 | 139 | { |
bea3348e | 140 | struct napi_struct *napi; |
1da177e4 LT |
141 | int budget = 16; |
142 | ||
5106930b | 143 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 144 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 145 | spin_trylock(&napi->poll_lock)) { |
5106930b | 146 | budget = poll_one_napi(dev->npinfo, napi, budget); |
bea3348e | 147 | spin_unlock(&napi->poll_lock); |
0a7606c1 DM |
148 | |
149 | if (!budget) | |
150 | break; | |
bea3348e | 151 | } |
1da177e4 LT |
152 | } |
153 | } | |
154 | ||
068c6e98 NH |
155 | static void service_arp_queue(struct netpoll_info *npi) |
156 | { | |
5106930b SH |
157 | if (npi) { |
158 | struct sk_buff *skb; | |
068c6e98 | 159 | |
5106930b SH |
160 | while ((skb = skb_dequeue(&npi->arp_tx))) |
161 | arp_reply(skb); | |
068c6e98 | 162 | } |
068c6e98 NH |
163 | } |
164 | ||
1da177e4 LT |
165 | void netpoll_poll(struct netpoll *np) |
166 | { | |
5106930b SH |
167 | struct net_device *dev = np->dev; |
168 | ||
169 | if (!dev || !netif_running(dev) || !dev->poll_controller) | |
1da177e4 LT |
170 | return; |
171 | ||
172 | /* Process pending work on NIC */ | |
5106930b SH |
173 | dev->poll_controller(dev); |
174 | ||
175 | poll_napi(dev); | |
1da177e4 | 176 | |
5106930b | 177 | service_arp_queue(dev->npinfo); |
068c6e98 | 178 | |
1da177e4 LT |
179 | zap_completion_queue(); |
180 | } | |
181 | ||
182 | static void refill_skbs(void) | |
183 | { | |
184 | struct sk_buff *skb; | |
185 | unsigned long flags; | |
186 | ||
a1bcfacd SH |
187 | spin_lock_irqsave(&skb_pool.lock, flags); |
188 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
189 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
190 | if (!skb) | |
191 | break; | |
192 | ||
a1bcfacd | 193 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 194 | } |
a1bcfacd | 195 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
196 | } |
197 | ||
198 | static void zap_completion_queue(void) | |
199 | { | |
200 | unsigned long flags; | |
201 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
202 | ||
203 | if (sd->completion_queue) { | |
204 | struct sk_buff *clist; | |
205 | ||
206 | local_irq_save(flags); | |
207 | clist = sd->completion_queue; | |
208 | sd->completion_queue = NULL; | |
209 | local_irq_restore(flags); | |
210 | ||
211 | while (clist != NULL) { | |
212 | struct sk_buff *skb = clist; | |
213 | clist = clist->next; | |
c68b9070 | 214 | if (skb->destructor) |
1da177e4 LT |
215 | dev_kfree_skb_any(skb); /* put this one back */ |
216 | else | |
217 | __kfree_skb(skb); | |
218 | } | |
219 | } | |
220 | ||
221 | put_cpu_var(softnet_data); | |
222 | } | |
223 | ||
a1bcfacd | 224 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 225 | { |
a1bcfacd SH |
226 | int count = 0; |
227 | struct sk_buff *skb; | |
1da177e4 LT |
228 | |
229 | zap_completion_queue(); | |
a1bcfacd | 230 | refill_skbs(); |
1da177e4 | 231 | repeat: |
1da177e4 LT |
232 | |
233 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
234 | if (!skb) |
235 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
236 | |
237 | if (!skb) { | |
a1bcfacd SH |
238 | if (++count < 10) { |
239 | netpoll_poll(np); | |
240 | goto repeat; | |
1da177e4 | 241 | } |
a1bcfacd | 242 | return NULL; |
1da177e4 LT |
243 | } |
244 | ||
245 | atomic_set(&skb->users, 1); | |
246 | skb_reserve(skb, reserve); | |
247 | return skb; | |
248 | } | |
249 | ||
bea3348e SH |
250 | static int netpoll_owner_active(struct net_device *dev) |
251 | { | |
252 | struct napi_struct *napi; | |
253 | ||
254 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
255 | if (napi->poll_owner == smp_processor_id()) | |
256 | return 1; | |
257 | } | |
258 | return 0; | |
259 | } | |
260 | ||
1da177e4 LT |
261 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
262 | { | |
2bdfe0ba SH |
263 | int status = NETDEV_TX_BUSY; |
264 | unsigned long tries; | |
4ec93edb YH |
265 | struct net_device *dev = np->dev; |
266 | struct netpoll_info *npinfo = np->dev->npinfo; | |
2bdfe0ba | 267 | |
4ec93edb YH |
268 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
269 | __kfree_skb(skb); | |
270 | return; | |
271 | } | |
2bdfe0ba SH |
272 | |
273 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 274 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
a49f99ff AM |
275 | unsigned long flags; |
276 | ||
277 | local_irq_save(flags); | |
0db3dc73 SH |
278 | /* try until next clock tick */ |
279 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
280 | tries > 0; --tries) { | |
281 | if (netif_tx_trylock(dev)) { | |
f25f4e44 | 282 | if (!netif_queue_stopped(dev) && |
668f895a | 283 | !netif_subqueue_stopped(dev, skb)) |
e37b8d93 | 284 | status = dev->hard_start_xmit(skb, dev); |
0db3dc73 | 285 | netif_tx_unlock(dev); |
e37b8d93 AM |
286 | |
287 | if (status == NETDEV_TX_OK) | |
288 | break; | |
289 | ||
e37b8d93 | 290 | } |
0db3dc73 SH |
291 | |
292 | /* tickle device maybe there is some cleanup */ | |
293 | netpoll_poll(np); | |
294 | ||
295 | udelay(USEC_PER_POLL); | |
0db1d6fc | 296 | } |
a49f99ff | 297 | local_irq_restore(flags); |
1da177e4 | 298 | } |
1da177e4 | 299 | |
2bdfe0ba | 300 | if (status != NETDEV_TX_OK) { |
5de4a473 | 301 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 302 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 303 | } |
1da177e4 LT |
304 | } |
305 | ||
306 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
307 | { | |
308 | int total_len, eth_len, ip_len, udp_len; | |
309 | struct sk_buff *skb; | |
310 | struct udphdr *udph; | |
311 | struct iphdr *iph; | |
312 | struct ethhdr *eth; | |
313 | ||
314 | udp_len = len + sizeof(*udph); | |
315 | ip_len = eth_len = udp_len + sizeof(*iph); | |
316 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
317 | ||
318 | skb = find_skb(np, total_len, total_len - len); | |
319 | if (!skb) | |
320 | return; | |
321 | ||
27d7ff46 | 322 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
323 | skb->len += len; |
324 | ||
4bedb452 ACM |
325 | skb_push(skb, sizeof(*udph)); |
326 | skb_reset_transport_header(skb); | |
327 | udph = udp_hdr(skb); | |
1da177e4 LT |
328 | udph->source = htons(np->local_port); |
329 | udph->dest = htons(np->remote_port); | |
330 | udph->len = htons(udp_len); | |
331 | udph->check = 0; | |
8e365eec CL |
332 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
333 | htonl(np->remote_ip), | |
334 | udp_len, IPPROTO_UDP, | |
335 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
336 | if (udph->check == 0) | |
5e57dff2 | 337 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 338 | |
e2d1bca7 ACM |
339 | skb_push(skb, sizeof(*iph)); |
340 | skb_reset_network_header(skb); | |
eddc9ec5 | 341 | iph = ip_hdr(skb); |
1da177e4 LT |
342 | |
343 | /* iph->version = 4; iph->ihl = 5; */ | |
344 | put_unaligned(0x45, (unsigned char *)iph); | |
345 | iph->tos = 0; | |
346 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
347 | iph->id = 0; | |
348 | iph->frag_off = 0; | |
349 | iph->ttl = 64; | |
350 | iph->protocol = IPPROTO_UDP; | |
351 | iph->check = 0; | |
352 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
353 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
354 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
355 | ||
356 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 357 | skb_reset_mac_header(skb); |
206daaf7 | 358 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
359 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
360 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
361 | |
362 | skb->dev = np->dev; | |
363 | ||
364 | netpoll_send_skb(np, skb); | |
365 | } | |
366 | ||
367 | static void arp_reply(struct sk_buff *skb) | |
368 | { | |
115c1d6e | 369 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
370 | struct arphdr *arp; |
371 | unsigned char *arp_ptr; | |
372 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 373 | __be32 sip, tip; |
47bbec02 | 374 | unsigned char *sha; |
1da177e4 | 375 | struct sk_buff *send_skb; |
115c1d6e | 376 | struct netpoll *np = NULL; |
1da177e4 | 377 | |
fbeec2e1 JM |
378 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
379 | np = npinfo->rx_np; | |
115c1d6e JM |
380 | if (!np) |
381 | return; | |
1da177e4 LT |
382 | |
383 | /* No arp on this interface */ | |
384 | if (skb->dev->flags & IFF_NOARP) | |
385 | return; | |
386 | ||
387 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
388 | (2 * skb->dev->addr_len) + | |
389 | (2 * sizeof(u32))))) | |
390 | return; | |
391 | ||
c1d2bbe1 | 392 | skb_reset_network_header(skb); |
badff6d0 | 393 | skb_reset_transport_header(skb); |
d0a92be0 | 394 | arp = arp_hdr(skb); |
1da177e4 LT |
395 | |
396 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
397 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
398 | arp->ar_pro != htons(ETH_P_IP) || | |
399 | arp->ar_op != htons(ARPOP_REQUEST)) | |
400 | return; | |
401 | ||
47bbec02 NH |
402 | arp_ptr = (unsigned char *)(arp+1); |
403 | /* save the location of the src hw addr */ | |
404 | sha = arp_ptr; | |
405 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 406 | memcpy(&sip, arp_ptr, 4); |
47bbec02 NH |
407 | arp_ptr += 4; |
408 | /* if we actually cared about dst hw addr, it would get copied here */ | |
409 | arp_ptr += skb->dev->addr_len; | |
1da177e4 LT |
410 | memcpy(&tip, arp_ptr, 4); |
411 | ||
412 | /* Should we ignore arp? */ | |
413 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
414 | return; | |
415 | ||
416 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
417 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
418 | LL_RESERVED_SPACE(np->dev)); | |
419 | ||
420 | if (!send_skb) | |
421 | return; | |
422 | ||
c1d2bbe1 | 423 | skb_reset_network_header(send_skb); |
1da177e4 LT |
424 | arp = (struct arphdr *) skb_put(send_skb, size); |
425 | send_skb->dev = skb->dev; | |
426 | send_skb->protocol = htons(ETH_P_ARP); | |
427 | ||
428 | /* Fill the device header for the ARP frame */ | |
0c4e8581 | 429 | if (dev_hard_header(send_skb, skb->dev, ptype, |
09538641 | 430 | sha, np->dev->dev_addr, |
0c4e8581 | 431 | send_skb->len) < 0) { |
1da177e4 LT |
432 | kfree_skb(send_skb); |
433 | return; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Fill out the arp protocol part. | |
438 | * | |
439 | * we only support ethernet device type, | |
440 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
441 | */ | |
442 | ||
443 | arp->ar_hrd = htons(np->dev->type); | |
444 | arp->ar_pro = htons(ETH_P_IP); | |
445 | arp->ar_hln = np->dev->addr_len; | |
446 | arp->ar_pln = 4; | |
447 | arp->ar_op = htons(type); | |
448 | ||
449 | arp_ptr=(unsigned char *)(arp + 1); | |
450 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
451 | arp_ptr += np->dev->addr_len; | |
452 | memcpy(arp_ptr, &tip, 4); | |
453 | arp_ptr += 4; | |
47bbec02 | 454 | memcpy(arp_ptr, sha, np->dev->addr_len); |
1da177e4 LT |
455 | arp_ptr += np->dev->addr_len; |
456 | memcpy(arp_ptr, &sip, 4); | |
457 | ||
458 | netpoll_send_skb(np, send_skb); | |
459 | } | |
460 | ||
461 | int __netpoll_rx(struct sk_buff *skb) | |
462 | { | |
463 | int proto, len, ulen; | |
464 | struct iphdr *iph; | |
465 | struct udphdr *uh; | |
068c6e98 NH |
466 | struct netpoll_info *npi = skb->dev->npinfo; |
467 | struct netpoll *np = npi->rx_np; | |
468 | ||
fbeec2e1 | 469 | if (!np) |
1da177e4 LT |
470 | goto out; |
471 | if (skb->dev->type != ARPHRD_ETHER) | |
472 | goto out; | |
473 | ||
33f807ba | 474 | /* if receive ARP during middle of NAPI poll, then queue */ |
724800d6 | 475 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 476 | atomic_read(&trapped)) { |
068c6e98 | 477 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
478 | return 1; |
479 | } | |
480 | ||
481 | proto = ntohs(eth_hdr(skb)->h_proto); | |
482 | if (proto != ETH_P_IP) | |
483 | goto out; | |
484 | if (skb->pkt_type == PACKET_OTHERHOST) | |
485 | goto out; | |
486 | if (skb_shared(skb)) | |
487 | goto out; | |
488 | ||
489 | iph = (struct iphdr *)skb->data; | |
490 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
491 | goto out; | |
492 | if (iph->ihl < 5 || iph->version != 4) | |
493 | goto out; | |
494 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
495 | goto out; | |
496 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
497 | goto out; | |
498 | ||
499 | len = ntohs(iph->tot_len); | |
500 | if (skb->len < len || len < iph->ihl*4) | |
501 | goto out; | |
502 | ||
5e7d7fa5 AL |
503 | /* |
504 | * Our transport medium may have padded the buffer out. | |
505 | * Now We trim to the true length of the frame. | |
506 | */ | |
507 | if (pskb_trim_rcsum(skb, len)) | |
508 | goto out; | |
509 | ||
1da177e4 LT |
510 | if (iph->protocol != IPPROTO_UDP) |
511 | goto out; | |
512 | ||
513 | len -= iph->ihl*4; | |
514 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
515 | ulen = ntohs(uh->len); | |
516 | ||
517 | if (ulen != len) | |
518 | goto out; | |
fb286bb2 | 519 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
520 | goto out; |
521 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
522 | goto out; | |
523 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
524 | goto out; | |
525 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
526 | goto out; | |
527 | ||
528 | np->rx_hook(np, ntohs(uh->source), | |
529 | (char *)(uh+1), | |
530 | ulen - sizeof(struct udphdr)); | |
531 | ||
532 | kfree_skb(skb); | |
533 | return 1; | |
534 | ||
535 | out: | |
33f807ba SH |
536 | /* If packet received while already in poll then just |
537 | * silently drop. | |
538 | */ | |
1da177e4 LT |
539 | if (atomic_read(&trapped)) { |
540 | kfree_skb(skb); | |
541 | return 1; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
0bcc1816 SS |
547 | void netpoll_print_options(struct netpoll *np) |
548 | { | |
0795af57 | 549 | DECLARE_MAC_BUF(mac); |
0bcc1816 SS |
550 | printk(KERN_INFO "%s: local port %d\n", |
551 | np->name, np->local_port); | |
552 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
553 | np->name, HIPQUAD(np->local_ip)); | |
554 | printk(KERN_INFO "%s: interface %s\n", | |
555 | np->name, np->dev_name); | |
556 | printk(KERN_INFO "%s: remote port %d\n", | |
557 | np->name, np->remote_port); | |
558 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
559 | np->name, HIPQUAD(np->remote_ip)); | |
0795af57 JP |
560 | printk(KERN_INFO "%s: remote ethernet address %s\n", |
561 | np->name, print_mac(mac, np->remote_mac)); | |
0bcc1816 SS |
562 | } |
563 | ||
1da177e4 LT |
564 | int netpoll_parse_options(struct netpoll *np, char *opt) |
565 | { | |
566 | char *cur=opt, *delim; | |
567 | ||
c68b9070 | 568 | if (*cur != '@') { |
1da177e4 LT |
569 | if ((delim = strchr(cur, '@')) == NULL) |
570 | goto parse_failed; | |
c68b9070 DM |
571 | *delim = 0; |
572 | np->local_port = simple_strtol(cur, NULL, 10); | |
573 | cur = delim; | |
1da177e4 LT |
574 | } |
575 | cur++; | |
1da177e4 | 576 | |
c68b9070 | 577 | if (*cur != '/') { |
1da177e4 LT |
578 | if ((delim = strchr(cur, '/')) == NULL) |
579 | goto parse_failed; | |
c68b9070 DM |
580 | *delim = 0; |
581 | np->local_ip = ntohl(in_aton(cur)); | |
582 | cur = delim; | |
1da177e4 LT |
583 | } |
584 | cur++; | |
585 | ||
c68b9070 | 586 | if (*cur != ',') { |
1da177e4 LT |
587 | /* parse out dev name */ |
588 | if ((delim = strchr(cur, ',')) == NULL) | |
589 | goto parse_failed; | |
c68b9070 | 590 | *delim = 0; |
1da177e4 | 591 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 592 | cur = delim; |
1da177e4 LT |
593 | } |
594 | cur++; | |
595 | ||
c68b9070 | 596 | if (*cur != '@') { |
1da177e4 LT |
597 | /* dst port */ |
598 | if ((delim = strchr(cur, '@')) == NULL) | |
599 | goto parse_failed; | |
c68b9070 DM |
600 | *delim = 0; |
601 | np->remote_port = simple_strtol(cur, NULL, 10); | |
602 | cur = delim; | |
1da177e4 LT |
603 | } |
604 | cur++; | |
1da177e4 LT |
605 | |
606 | /* dst ip */ | |
607 | if ((delim = strchr(cur, '/')) == NULL) | |
608 | goto parse_failed; | |
c68b9070 DM |
609 | *delim = 0; |
610 | np->remote_ip = ntohl(in_aton(cur)); | |
611 | cur = delim + 1; | |
1da177e4 | 612 | |
c68b9070 | 613 | if (*cur != 0) { |
1da177e4 LT |
614 | /* MAC address */ |
615 | if ((delim = strchr(cur, ':')) == NULL) | |
616 | goto parse_failed; | |
c68b9070 DM |
617 | *delim = 0; |
618 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
619 | cur = delim + 1; | |
1da177e4 LT |
620 | if ((delim = strchr(cur, ':')) == NULL) |
621 | goto parse_failed; | |
c68b9070 DM |
622 | *delim = 0; |
623 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
624 | cur = delim + 1; | |
1da177e4 LT |
625 | if ((delim = strchr(cur, ':')) == NULL) |
626 | goto parse_failed; | |
c68b9070 DM |
627 | *delim = 0; |
628 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
629 | cur = delim + 1; | |
1da177e4 LT |
630 | if ((delim = strchr(cur, ':')) == NULL) |
631 | goto parse_failed; | |
c68b9070 DM |
632 | *delim = 0; |
633 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
634 | cur = delim + 1; | |
1da177e4 LT |
635 | if ((delim = strchr(cur, ':')) == NULL) |
636 | goto parse_failed; | |
c68b9070 DM |
637 | *delim = 0; |
638 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
639 | cur = delim + 1; | |
640 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
641 | } |
642 | ||
0bcc1816 | 643 | netpoll_print_options(np); |
1da177e4 LT |
644 | |
645 | return 0; | |
646 | ||
647 | parse_failed: | |
648 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
649 | np->name, cur); | |
650 | return -1; | |
651 | } | |
652 | ||
653 | int netpoll_setup(struct netpoll *np) | |
654 | { | |
655 | struct net_device *ndev = NULL; | |
656 | struct in_device *in_dev; | |
115c1d6e | 657 | struct netpoll_info *npinfo; |
fbeec2e1 | 658 | unsigned long flags; |
b41848b6 | 659 | int err; |
1da177e4 LT |
660 | |
661 | if (np->dev_name) | |
881d966b | 662 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 LT |
663 | if (!ndev) { |
664 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
665 | np->name, np->dev_name); | |
b41848b6 | 666 | return -ENODEV; |
1da177e4 LT |
667 | } |
668 | ||
669 | np->dev = ndev; | |
115c1d6e JM |
670 | if (!ndev->npinfo) { |
671 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
672 | if (!npinfo) { |
673 | err = -ENOMEM; | |
115c1d6e | 674 | goto release; |
b41848b6 | 675 | } |
115c1d6e | 676 | |
fbeec2e1 | 677 | npinfo->rx_np = NULL; |
2bdfe0ba | 678 | |
a9f6a0dd | 679 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 680 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 681 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 682 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 683 | |
93ec2c72 SH |
684 | atomic_set(&npinfo->refcnt, 1); |
685 | } else { | |
115c1d6e | 686 | npinfo = ndev->npinfo; |
93ec2c72 SH |
687 | atomic_inc(&npinfo->refcnt); |
688 | } | |
1da177e4 LT |
689 | |
690 | if (!ndev->poll_controller) { | |
691 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
692 | np->name, np->dev_name); | |
b41848b6 | 693 | err = -ENOTSUPP; |
1da177e4 LT |
694 | goto release; |
695 | } | |
696 | ||
697 | if (!netif_running(ndev)) { | |
698 | unsigned long atmost, atleast; | |
699 | ||
700 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
701 | np->name, np->dev_name); | |
702 | ||
6756ae4b | 703 | rtnl_lock(); |
b41848b6 SH |
704 | err = dev_open(ndev); |
705 | rtnl_unlock(); | |
706 | ||
707 | if (err) { | |
1da177e4 | 708 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 709 | np->name, ndev->name); |
1da177e4 LT |
710 | goto release; |
711 | } | |
1da177e4 LT |
712 | |
713 | atleast = jiffies + HZ/10; | |
4ec93edb | 714 | atmost = jiffies + 4*HZ; |
1da177e4 LT |
715 | while (!netif_carrier_ok(ndev)) { |
716 | if (time_after(jiffies, atmost)) { | |
717 | printk(KERN_NOTICE | |
718 | "%s: timeout waiting for carrier\n", | |
719 | np->name); | |
720 | break; | |
721 | } | |
722 | cond_resched(); | |
723 | } | |
724 | ||
725 | /* If carrier appears to come up instantly, we don't | |
726 | * trust it and pause so that we don't pump all our | |
727 | * queued console messages into the bitbucket. | |
728 | */ | |
729 | ||
730 | if (time_before(jiffies, atleast)) { | |
731 | printk(KERN_NOTICE "%s: carrier detect appears" | |
732 | " untrustworthy, waiting 4 seconds\n", | |
733 | np->name); | |
734 | msleep(4000); | |
735 | } | |
736 | } | |
737 | ||
1da177e4 LT |
738 | if (!np->local_ip) { |
739 | rcu_read_lock(); | |
e5ed6399 | 740 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
741 | |
742 | if (!in_dev || !in_dev->ifa_list) { | |
743 | rcu_read_unlock(); | |
744 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
745 | np->name, np->dev_name); | |
b41848b6 | 746 | err = -EDESTADDRREQ; |
1da177e4 LT |
747 | goto release; |
748 | } | |
749 | ||
750 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
751 | rcu_read_unlock(); | |
752 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
753 | np->name, HIPQUAD(np->local_ip)); | |
754 | } | |
755 | ||
fbeec2e1 JM |
756 | if (np->rx_hook) { |
757 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
fbeec2e1 JM |
758 | npinfo->rx_np = np; |
759 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
760 | } | |
26520765 IM |
761 | |
762 | /* fill up the skb queue */ | |
763 | refill_skbs(); | |
764 | ||
fbeec2e1 | 765 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 766 | ndev->npinfo = npinfo; |
1da177e4 | 767 | |
53fb95d3 MM |
768 | /* avoid racing with NAPI reading npinfo */ |
769 | synchronize_rcu(); | |
770 | ||
1da177e4 LT |
771 | return 0; |
772 | ||
773 | release: | |
115c1d6e JM |
774 | if (!ndev->npinfo) |
775 | kfree(npinfo); | |
1da177e4 LT |
776 | np->dev = NULL; |
777 | dev_put(ndev); | |
b41848b6 | 778 | return err; |
1da177e4 LT |
779 | } |
780 | ||
c68b9070 DM |
781 | static int __init netpoll_init(void) |
782 | { | |
a1bcfacd SH |
783 | skb_queue_head_init(&skb_pool); |
784 | return 0; | |
785 | } | |
786 | core_initcall(netpoll_init); | |
787 | ||
1da177e4 LT |
788 | void netpoll_cleanup(struct netpoll *np) |
789 | { | |
fbeec2e1 JM |
790 | struct netpoll_info *npinfo; |
791 | unsigned long flags; | |
792 | ||
115c1d6e | 793 | if (np->dev) { |
fbeec2e1 | 794 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
795 | if (npinfo) { |
796 | if (npinfo->rx_np == np) { | |
797 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
798 | npinfo->rx_np = NULL; | |
93ec2c72 SH |
799 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
800 | } | |
801 | ||
93ec2c72 SH |
802 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
803 | skb_queue_purge(&npinfo->arp_tx); | |
4ec93edb | 804 | skb_queue_purge(&npinfo->txq); |
25442caf | 805 | cancel_rearming_delayed_work(&npinfo->tx_work); |
93ec2c72 | 806 | |
17200811 | 807 | /* clean after last, unfinished work */ |
0adc9add | 808 | __skb_queue_purge(&npinfo->txq); |
93ec2c72 | 809 | kfree(npinfo); |
1498b3f1 | 810 | np->dev->npinfo = NULL; |
93ec2c72 | 811 | } |
fbeec2e1 | 812 | } |
93ec2c72 | 813 | |
115c1d6e JM |
814 | dev_put(np->dev); |
815 | } | |
fbeec2e1 | 816 | |
1da177e4 LT |
817 | np->dev = NULL; |
818 | } | |
819 | ||
820 | int netpoll_trap(void) | |
821 | { | |
822 | return atomic_read(&trapped); | |
823 | } | |
824 | ||
825 | void netpoll_set_trap(int trap) | |
826 | { | |
827 | if (trap) | |
828 | atomic_inc(&trapped); | |
829 | else | |
830 | atomic_dec(&trapped); | |
831 | } | |
832 | ||
833 | EXPORT_SYMBOL(netpoll_set_trap); | |
834 | EXPORT_SYMBOL(netpoll_trap); | |
0bcc1816 | 835 | EXPORT_SYMBOL(netpoll_print_options); |
1da177e4 LT |
836 | EXPORT_SYMBOL(netpoll_parse_options); |
837 | EXPORT_SYMBOL(netpoll_setup); | |
838 | EXPORT_SYMBOL(netpoll_cleanup); | |
839 | EXPORT_SYMBOL(netpoll_send_udp); | |
840 | EXPORT_SYMBOL(netpoll_poll); |