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 |
d9452e9f DM |
42 | #define NETPOLL_RX_ENABLED 1 |
43 | #define NETPOLL_RX_DROP 2 | |
1da177e4 LT |
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 | 69 | if ((netif_queue_stopped(dev) || |
668f895a | 70 | netif_subqueue_stopped(dev, skb)) || |
f25f4e44 | 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 | */ | |
0a7606c1 DM |
119 | static int poll_one_napi(struct netpoll_info *npinfo, |
120 | struct napi_struct *napi, int budget) | |
121 | { | |
122 | int work; | |
123 | ||
124 | /* net_rx_action's ->poll() invocations and our's are | |
125 | * synchronized by this test which is only made while | |
126 | * holding the napi->poll_lock. | |
127 | */ | |
128 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
129 | return budget; | |
130 | ||
d9452e9f | 131 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
0a7606c1 DM |
132 | atomic_inc(&trapped); |
133 | ||
134 | work = napi->poll(napi, budget); | |
135 | ||
136 | atomic_dec(&trapped); | |
d9452e9f | 137 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
0a7606c1 DM |
138 | |
139 | return budget - work; | |
140 | } | |
141 | ||
5106930b | 142 | static void poll_napi(struct net_device *dev) |
1da177e4 | 143 | { |
bea3348e | 144 | struct napi_struct *napi; |
1da177e4 LT |
145 | int budget = 16; |
146 | ||
5106930b | 147 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 148 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 149 | spin_trylock(&napi->poll_lock)) { |
5106930b | 150 | budget = poll_one_napi(dev->npinfo, napi, budget); |
bea3348e | 151 | spin_unlock(&napi->poll_lock); |
0a7606c1 DM |
152 | |
153 | if (!budget) | |
154 | break; | |
bea3348e | 155 | } |
1da177e4 LT |
156 | } |
157 | } | |
158 | ||
068c6e98 NH |
159 | static void service_arp_queue(struct netpoll_info *npi) |
160 | { | |
5106930b SH |
161 | if (npi) { |
162 | struct sk_buff *skb; | |
068c6e98 | 163 | |
5106930b SH |
164 | while ((skb = skb_dequeue(&npi->arp_tx))) |
165 | arp_reply(skb); | |
068c6e98 | 166 | } |
068c6e98 NH |
167 | } |
168 | ||
1da177e4 LT |
169 | void netpoll_poll(struct netpoll *np) |
170 | { | |
5106930b SH |
171 | struct net_device *dev = np->dev; |
172 | ||
173 | if (!dev || !netif_running(dev) || !dev->poll_controller) | |
1da177e4 LT |
174 | return; |
175 | ||
176 | /* Process pending work on NIC */ | |
5106930b SH |
177 | dev->poll_controller(dev); |
178 | ||
179 | poll_napi(dev); | |
1da177e4 | 180 | |
5106930b | 181 | service_arp_queue(dev->npinfo); |
068c6e98 | 182 | |
1da177e4 LT |
183 | zap_completion_queue(); |
184 | } | |
185 | ||
186 | static void refill_skbs(void) | |
187 | { | |
188 | struct sk_buff *skb; | |
189 | unsigned long flags; | |
190 | ||
a1bcfacd SH |
191 | spin_lock_irqsave(&skb_pool.lock, flags); |
192 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
193 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
194 | if (!skb) | |
195 | break; | |
196 | ||
a1bcfacd | 197 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 198 | } |
a1bcfacd | 199 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
200 | } |
201 | ||
202 | static void zap_completion_queue(void) | |
203 | { | |
204 | unsigned long flags; | |
205 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
206 | ||
207 | if (sd->completion_queue) { | |
208 | struct sk_buff *clist; | |
209 | ||
210 | local_irq_save(flags); | |
211 | clist = sd->completion_queue; | |
212 | sd->completion_queue = NULL; | |
213 | local_irq_restore(flags); | |
214 | ||
215 | while (clist != NULL) { | |
216 | struct sk_buff *skb = clist; | |
217 | clist = clist->next; | |
8a455b08 JP |
218 | if (skb->destructor) { |
219 | atomic_inc(&skb->users); | |
1da177e4 | 220 | dev_kfree_skb_any(skb); /* put this one back */ |
8a455b08 | 221 | } else { |
1da177e4 | 222 | __kfree_skb(skb); |
8a455b08 | 223 | } |
1da177e4 LT |
224 | } |
225 | } | |
226 | ||
227 | put_cpu_var(softnet_data); | |
228 | } | |
229 | ||
a1bcfacd | 230 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 231 | { |
a1bcfacd SH |
232 | int count = 0; |
233 | struct sk_buff *skb; | |
1da177e4 LT |
234 | |
235 | zap_completion_queue(); | |
a1bcfacd | 236 | refill_skbs(); |
1da177e4 | 237 | repeat: |
1da177e4 LT |
238 | |
239 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
240 | if (!skb) |
241 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
242 | |
243 | if (!skb) { | |
a1bcfacd SH |
244 | if (++count < 10) { |
245 | netpoll_poll(np); | |
246 | goto repeat; | |
1da177e4 | 247 | } |
a1bcfacd | 248 | return NULL; |
1da177e4 LT |
249 | } |
250 | ||
251 | atomic_set(&skb->users, 1); | |
252 | skb_reserve(skb, reserve); | |
253 | return skb; | |
254 | } | |
255 | ||
bea3348e SH |
256 | static int netpoll_owner_active(struct net_device *dev) |
257 | { | |
258 | struct napi_struct *napi; | |
259 | ||
260 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
261 | if (napi->poll_owner == smp_processor_id()) | |
262 | return 1; | |
263 | } | |
264 | return 0; | |
265 | } | |
266 | ||
1da177e4 LT |
267 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
268 | { | |
2bdfe0ba SH |
269 | int status = NETDEV_TX_BUSY; |
270 | unsigned long tries; | |
4ec93edb YH |
271 | struct net_device *dev = np->dev; |
272 | struct netpoll_info *npinfo = np->dev->npinfo; | |
2bdfe0ba | 273 | |
4ec93edb YH |
274 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
275 | __kfree_skb(skb); | |
276 | return; | |
277 | } | |
2bdfe0ba SH |
278 | |
279 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 280 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
a49f99ff AM |
281 | unsigned long flags; |
282 | ||
283 | local_irq_save(flags); | |
0db3dc73 SH |
284 | /* try until next clock tick */ |
285 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
286 | tries > 0; --tries) { | |
287 | if (netif_tx_trylock(dev)) { | |
f25f4e44 | 288 | if (!netif_queue_stopped(dev) && |
668f895a | 289 | !netif_subqueue_stopped(dev, skb)) |
e37b8d93 | 290 | status = dev->hard_start_xmit(skb, dev); |
0db3dc73 | 291 | netif_tx_unlock(dev); |
e37b8d93 AM |
292 | |
293 | if (status == NETDEV_TX_OK) | |
294 | break; | |
295 | ||
e37b8d93 | 296 | } |
0db3dc73 SH |
297 | |
298 | /* tickle device maybe there is some cleanup */ | |
299 | netpoll_poll(np); | |
300 | ||
301 | udelay(USEC_PER_POLL); | |
0db1d6fc | 302 | } |
a49f99ff | 303 | local_irq_restore(flags); |
1da177e4 | 304 | } |
1da177e4 | 305 | |
2bdfe0ba | 306 | if (status != NETDEV_TX_OK) { |
5de4a473 | 307 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 308 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 309 | } |
1da177e4 LT |
310 | } |
311 | ||
312 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
313 | { | |
314 | int total_len, eth_len, ip_len, udp_len; | |
315 | struct sk_buff *skb; | |
316 | struct udphdr *udph; | |
317 | struct iphdr *iph; | |
318 | struct ethhdr *eth; | |
319 | ||
320 | udp_len = len + sizeof(*udph); | |
321 | ip_len = eth_len = udp_len + sizeof(*iph); | |
322 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
323 | ||
324 | skb = find_skb(np, total_len, total_len - len); | |
325 | if (!skb) | |
326 | return; | |
327 | ||
27d7ff46 | 328 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
329 | skb->len += len; |
330 | ||
4bedb452 ACM |
331 | skb_push(skb, sizeof(*udph)); |
332 | skb_reset_transport_header(skb); | |
333 | udph = udp_hdr(skb); | |
1da177e4 LT |
334 | udph->source = htons(np->local_port); |
335 | udph->dest = htons(np->remote_port); | |
336 | udph->len = htons(udp_len); | |
337 | udph->check = 0; | |
8e365eec CL |
338 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
339 | htonl(np->remote_ip), | |
340 | udp_len, IPPROTO_UDP, | |
341 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
342 | if (udph->check == 0) | |
5e57dff2 | 343 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 344 | |
e2d1bca7 ACM |
345 | skb_push(skb, sizeof(*iph)); |
346 | skb_reset_network_header(skb); | |
eddc9ec5 | 347 | iph = ip_hdr(skb); |
1da177e4 LT |
348 | |
349 | /* iph->version = 4; iph->ihl = 5; */ | |
350 | put_unaligned(0x45, (unsigned char *)iph); | |
351 | iph->tos = 0; | |
352 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
353 | iph->id = 0; | |
354 | iph->frag_off = 0; | |
355 | iph->ttl = 64; | |
356 | iph->protocol = IPPROTO_UDP; | |
357 | iph->check = 0; | |
358 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
359 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
360 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
361 | ||
362 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 363 | skb_reset_mac_header(skb); |
206daaf7 | 364 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
365 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
366 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
367 | |
368 | skb->dev = np->dev; | |
369 | ||
370 | netpoll_send_skb(np, skb); | |
371 | } | |
372 | ||
373 | static void arp_reply(struct sk_buff *skb) | |
374 | { | |
115c1d6e | 375 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
376 | struct arphdr *arp; |
377 | unsigned char *arp_ptr; | |
378 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 379 | __be32 sip, tip; |
47bbec02 | 380 | unsigned char *sha; |
1da177e4 | 381 | struct sk_buff *send_skb; |
115c1d6e | 382 | struct netpoll *np = NULL; |
1da177e4 | 383 | |
fbeec2e1 JM |
384 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
385 | np = npinfo->rx_np; | |
115c1d6e JM |
386 | if (!np) |
387 | return; | |
1da177e4 LT |
388 | |
389 | /* No arp on this interface */ | |
390 | if (skb->dev->flags & IFF_NOARP) | |
391 | return; | |
392 | ||
393 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
394 | (2 * skb->dev->addr_len) + | |
395 | (2 * sizeof(u32))))) | |
396 | return; | |
397 | ||
c1d2bbe1 | 398 | skb_reset_network_header(skb); |
badff6d0 | 399 | skb_reset_transport_header(skb); |
d0a92be0 | 400 | arp = arp_hdr(skb); |
1da177e4 LT |
401 | |
402 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
403 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
404 | arp->ar_pro != htons(ETH_P_IP) || | |
405 | arp->ar_op != htons(ARPOP_REQUEST)) | |
406 | return; | |
407 | ||
47bbec02 NH |
408 | arp_ptr = (unsigned char *)(arp+1); |
409 | /* save the location of the src hw addr */ | |
410 | sha = arp_ptr; | |
411 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 412 | memcpy(&sip, arp_ptr, 4); |
47bbec02 NH |
413 | arp_ptr += 4; |
414 | /* if we actually cared about dst hw addr, it would get copied here */ | |
415 | arp_ptr += skb->dev->addr_len; | |
1da177e4 LT |
416 | memcpy(&tip, arp_ptr, 4); |
417 | ||
418 | /* Should we ignore arp? */ | |
21cf2253 JP |
419 | if (tip != htonl(np->local_ip) || |
420 | ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) | |
1da177e4 LT |
421 | return; |
422 | ||
423 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
424 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
425 | LL_RESERVED_SPACE(np->dev)); | |
426 | ||
427 | if (!send_skb) | |
428 | return; | |
429 | ||
c1d2bbe1 | 430 | skb_reset_network_header(send_skb); |
1da177e4 LT |
431 | arp = (struct arphdr *) skb_put(send_skb, size); |
432 | send_skb->dev = skb->dev; | |
433 | send_skb->protocol = htons(ETH_P_ARP); | |
434 | ||
435 | /* Fill the device header for the ARP frame */ | |
0c4e8581 | 436 | if (dev_hard_header(send_skb, skb->dev, ptype, |
09538641 | 437 | sha, np->dev->dev_addr, |
0c4e8581 | 438 | send_skb->len) < 0) { |
1da177e4 LT |
439 | kfree_skb(send_skb); |
440 | return; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Fill out the arp protocol part. | |
445 | * | |
446 | * we only support ethernet device type, | |
447 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
448 | */ | |
449 | ||
450 | arp->ar_hrd = htons(np->dev->type); | |
451 | arp->ar_pro = htons(ETH_P_IP); | |
452 | arp->ar_hln = np->dev->addr_len; | |
453 | arp->ar_pln = 4; | |
454 | arp->ar_op = htons(type); | |
455 | ||
456 | arp_ptr=(unsigned char *)(arp + 1); | |
457 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
458 | arp_ptr += np->dev->addr_len; | |
459 | memcpy(arp_ptr, &tip, 4); | |
460 | arp_ptr += 4; | |
47bbec02 | 461 | memcpy(arp_ptr, sha, np->dev->addr_len); |
1da177e4 LT |
462 | arp_ptr += np->dev->addr_len; |
463 | memcpy(arp_ptr, &sip, 4); | |
464 | ||
465 | netpoll_send_skb(np, send_skb); | |
466 | } | |
467 | ||
468 | int __netpoll_rx(struct sk_buff *skb) | |
469 | { | |
470 | int proto, len, ulen; | |
471 | struct iphdr *iph; | |
472 | struct udphdr *uh; | |
068c6e98 NH |
473 | struct netpoll_info *npi = skb->dev->npinfo; |
474 | struct netpoll *np = npi->rx_np; | |
475 | ||
fbeec2e1 | 476 | if (!np) |
1da177e4 LT |
477 | goto out; |
478 | if (skb->dev->type != ARPHRD_ETHER) | |
479 | goto out; | |
480 | ||
d9452e9f | 481 | /* check if netpoll clients need ARP */ |
724800d6 | 482 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 483 | atomic_read(&trapped)) { |
068c6e98 | 484 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
485 | return 1; |
486 | } | |
487 | ||
488 | proto = ntohs(eth_hdr(skb)->h_proto); | |
489 | if (proto != ETH_P_IP) | |
490 | goto out; | |
491 | if (skb->pkt_type == PACKET_OTHERHOST) | |
492 | goto out; | |
493 | if (skb_shared(skb)) | |
494 | goto out; | |
495 | ||
496 | iph = (struct iphdr *)skb->data; | |
497 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
498 | goto out; | |
499 | if (iph->ihl < 5 || iph->version != 4) | |
500 | goto out; | |
501 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
502 | goto out; | |
503 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
504 | goto out; | |
505 | ||
506 | len = ntohs(iph->tot_len); | |
507 | if (skb->len < len || len < iph->ihl*4) | |
508 | goto out; | |
509 | ||
5e7d7fa5 AL |
510 | /* |
511 | * Our transport medium may have padded the buffer out. | |
512 | * Now We trim to the true length of the frame. | |
513 | */ | |
514 | if (pskb_trim_rcsum(skb, len)) | |
515 | goto out; | |
516 | ||
1da177e4 LT |
517 | if (iph->protocol != IPPROTO_UDP) |
518 | goto out; | |
519 | ||
520 | len -= iph->ihl*4; | |
521 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
522 | ulen = ntohs(uh->len); | |
523 | ||
524 | if (ulen != len) | |
525 | goto out; | |
fb286bb2 | 526 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
527 | goto out; |
528 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
529 | goto out; | |
530 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
531 | goto out; | |
532 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
533 | goto out; | |
534 | ||
535 | np->rx_hook(np, ntohs(uh->source), | |
536 | (char *)(uh+1), | |
537 | ulen - sizeof(struct udphdr)); | |
538 | ||
539 | kfree_skb(skb); | |
540 | return 1; | |
541 | ||
542 | out: | |
543 | if (atomic_read(&trapped)) { | |
544 | kfree_skb(skb); | |
545 | return 1; | |
546 | } | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
0bcc1816 SS |
551 | void netpoll_print_options(struct netpoll *np) |
552 | { | |
0795af57 | 553 | DECLARE_MAC_BUF(mac); |
0bcc1816 SS |
554 | printk(KERN_INFO "%s: local port %d\n", |
555 | np->name, np->local_port); | |
556 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
557 | np->name, HIPQUAD(np->local_ip)); | |
558 | printk(KERN_INFO "%s: interface %s\n", | |
559 | np->name, np->dev_name); | |
560 | printk(KERN_INFO "%s: remote port %d\n", | |
561 | np->name, np->remote_port); | |
562 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
563 | np->name, HIPQUAD(np->remote_ip)); | |
0795af57 JP |
564 | printk(KERN_INFO "%s: remote ethernet address %s\n", |
565 | np->name, print_mac(mac, np->remote_mac)); | |
0bcc1816 SS |
566 | } |
567 | ||
1da177e4 LT |
568 | int netpoll_parse_options(struct netpoll *np, char *opt) |
569 | { | |
570 | char *cur=opt, *delim; | |
571 | ||
c68b9070 | 572 | if (*cur != '@') { |
1da177e4 LT |
573 | if ((delim = strchr(cur, '@')) == NULL) |
574 | goto parse_failed; | |
c68b9070 DM |
575 | *delim = 0; |
576 | np->local_port = simple_strtol(cur, NULL, 10); | |
577 | cur = delim; | |
1da177e4 LT |
578 | } |
579 | cur++; | |
1da177e4 | 580 | |
c68b9070 | 581 | if (*cur != '/') { |
1da177e4 LT |
582 | if ((delim = strchr(cur, '/')) == NULL) |
583 | goto parse_failed; | |
c68b9070 DM |
584 | *delim = 0; |
585 | np->local_ip = ntohl(in_aton(cur)); | |
586 | cur = delim; | |
1da177e4 LT |
587 | } |
588 | cur++; | |
589 | ||
c68b9070 | 590 | if (*cur != ',') { |
1da177e4 LT |
591 | /* parse out dev name */ |
592 | if ((delim = strchr(cur, ',')) == NULL) | |
593 | goto parse_failed; | |
c68b9070 | 594 | *delim = 0; |
1da177e4 | 595 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 596 | cur = delim; |
1da177e4 LT |
597 | } |
598 | cur++; | |
599 | ||
c68b9070 | 600 | if (*cur != '@') { |
1da177e4 LT |
601 | /* dst port */ |
602 | if ((delim = strchr(cur, '@')) == NULL) | |
603 | goto parse_failed; | |
c68b9070 DM |
604 | *delim = 0; |
605 | np->remote_port = simple_strtol(cur, NULL, 10); | |
606 | cur = delim; | |
1da177e4 LT |
607 | } |
608 | cur++; | |
1da177e4 LT |
609 | |
610 | /* dst ip */ | |
611 | if ((delim = strchr(cur, '/')) == NULL) | |
612 | goto parse_failed; | |
c68b9070 DM |
613 | *delim = 0; |
614 | np->remote_ip = ntohl(in_aton(cur)); | |
615 | cur = delim + 1; | |
1da177e4 | 616 | |
c68b9070 | 617 | if (*cur != 0) { |
1da177e4 LT |
618 | /* MAC address */ |
619 | if ((delim = strchr(cur, ':')) == NULL) | |
620 | goto parse_failed; | |
c68b9070 DM |
621 | *delim = 0; |
622 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
623 | cur = delim + 1; | |
1da177e4 LT |
624 | if ((delim = strchr(cur, ':')) == NULL) |
625 | goto parse_failed; | |
c68b9070 DM |
626 | *delim = 0; |
627 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
628 | cur = delim + 1; | |
1da177e4 LT |
629 | if ((delim = strchr(cur, ':')) == NULL) |
630 | goto parse_failed; | |
c68b9070 DM |
631 | *delim = 0; |
632 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
633 | cur = delim + 1; | |
1da177e4 LT |
634 | if ((delim = strchr(cur, ':')) == NULL) |
635 | goto parse_failed; | |
c68b9070 DM |
636 | *delim = 0; |
637 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
638 | cur = delim + 1; | |
1da177e4 LT |
639 | if ((delim = strchr(cur, ':')) == NULL) |
640 | goto parse_failed; | |
c68b9070 DM |
641 | *delim = 0; |
642 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
643 | cur = delim + 1; | |
644 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
645 | } |
646 | ||
0bcc1816 | 647 | netpoll_print_options(np); |
1da177e4 LT |
648 | |
649 | return 0; | |
650 | ||
651 | parse_failed: | |
652 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
653 | np->name, cur); | |
654 | return -1; | |
655 | } | |
656 | ||
657 | int netpoll_setup(struct netpoll *np) | |
658 | { | |
659 | struct net_device *ndev = NULL; | |
660 | struct in_device *in_dev; | |
115c1d6e | 661 | struct netpoll_info *npinfo; |
fbeec2e1 | 662 | unsigned long flags; |
b41848b6 | 663 | int err; |
1da177e4 LT |
664 | |
665 | if (np->dev_name) | |
881d966b | 666 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 LT |
667 | if (!ndev) { |
668 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
669 | np->name, np->dev_name); | |
b41848b6 | 670 | return -ENODEV; |
1da177e4 LT |
671 | } |
672 | ||
673 | np->dev = ndev; | |
115c1d6e JM |
674 | if (!ndev->npinfo) { |
675 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
676 | if (!npinfo) { |
677 | err = -ENOMEM; | |
115c1d6e | 678 | goto release; |
b41848b6 | 679 | } |
115c1d6e | 680 | |
d9452e9f | 681 | npinfo->rx_flags = 0; |
fbeec2e1 | 682 | npinfo->rx_np = NULL; |
2bdfe0ba | 683 | |
a9f6a0dd | 684 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 685 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 686 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 687 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 688 | |
93ec2c72 SH |
689 | atomic_set(&npinfo->refcnt, 1); |
690 | } else { | |
115c1d6e | 691 | npinfo = ndev->npinfo; |
93ec2c72 SH |
692 | atomic_inc(&npinfo->refcnt); |
693 | } | |
1da177e4 LT |
694 | |
695 | if (!ndev->poll_controller) { | |
696 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
697 | np->name, np->dev_name); | |
b41848b6 | 698 | err = -ENOTSUPP; |
1da177e4 LT |
699 | goto release; |
700 | } | |
701 | ||
702 | if (!netif_running(ndev)) { | |
703 | unsigned long atmost, atleast; | |
704 | ||
705 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
706 | np->name, np->dev_name); | |
707 | ||
6756ae4b | 708 | rtnl_lock(); |
b41848b6 SH |
709 | err = dev_open(ndev); |
710 | rtnl_unlock(); | |
711 | ||
712 | if (err) { | |
1da177e4 | 713 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 714 | np->name, ndev->name); |
1da177e4 LT |
715 | goto release; |
716 | } | |
1da177e4 LT |
717 | |
718 | atleast = jiffies + HZ/10; | |
4ec93edb | 719 | atmost = jiffies + 4*HZ; |
1da177e4 LT |
720 | while (!netif_carrier_ok(ndev)) { |
721 | if (time_after(jiffies, atmost)) { | |
722 | printk(KERN_NOTICE | |
723 | "%s: timeout waiting for carrier\n", | |
724 | np->name); | |
725 | break; | |
726 | } | |
727 | cond_resched(); | |
728 | } | |
729 | ||
730 | /* If carrier appears to come up instantly, we don't | |
731 | * trust it and pause so that we don't pump all our | |
732 | * queued console messages into the bitbucket. | |
733 | */ | |
734 | ||
735 | if (time_before(jiffies, atleast)) { | |
736 | printk(KERN_NOTICE "%s: carrier detect appears" | |
737 | " untrustworthy, waiting 4 seconds\n", | |
738 | np->name); | |
739 | msleep(4000); | |
740 | } | |
741 | } | |
742 | ||
1da177e4 LT |
743 | if (!np->local_ip) { |
744 | rcu_read_lock(); | |
e5ed6399 | 745 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
746 | |
747 | if (!in_dev || !in_dev->ifa_list) { | |
748 | rcu_read_unlock(); | |
749 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
750 | np->name, np->dev_name); | |
b41848b6 | 751 | err = -EDESTADDRREQ; |
1da177e4 LT |
752 | goto release; |
753 | } | |
754 | ||
755 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
756 | rcu_read_unlock(); | |
757 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
758 | np->name, HIPQUAD(np->local_ip)); | |
759 | } | |
760 | ||
fbeec2e1 JM |
761 | if (np->rx_hook) { |
762 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
d9452e9f | 763 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
fbeec2e1 JM |
764 | npinfo->rx_np = np; |
765 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
766 | } | |
26520765 IM |
767 | |
768 | /* fill up the skb queue */ | |
769 | refill_skbs(); | |
770 | ||
fbeec2e1 | 771 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 772 | ndev->npinfo = npinfo; |
1da177e4 | 773 | |
53fb95d3 MM |
774 | /* avoid racing with NAPI reading npinfo */ |
775 | synchronize_rcu(); | |
776 | ||
1da177e4 LT |
777 | return 0; |
778 | ||
779 | release: | |
115c1d6e JM |
780 | if (!ndev->npinfo) |
781 | kfree(npinfo); | |
1da177e4 LT |
782 | np->dev = NULL; |
783 | dev_put(ndev); | |
b41848b6 | 784 | return err; |
1da177e4 LT |
785 | } |
786 | ||
c68b9070 DM |
787 | static int __init netpoll_init(void) |
788 | { | |
a1bcfacd SH |
789 | skb_queue_head_init(&skb_pool); |
790 | return 0; | |
791 | } | |
792 | core_initcall(netpoll_init); | |
793 | ||
1da177e4 LT |
794 | void netpoll_cleanup(struct netpoll *np) |
795 | { | |
fbeec2e1 JM |
796 | struct netpoll_info *npinfo; |
797 | unsigned long flags; | |
798 | ||
115c1d6e | 799 | if (np->dev) { |
fbeec2e1 | 800 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
801 | if (npinfo) { |
802 | if (npinfo->rx_np == np) { | |
803 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
804 | npinfo->rx_np = NULL; | |
d9452e9f | 805 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; |
93ec2c72 SH |
806 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
807 | } | |
808 | ||
93ec2c72 SH |
809 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
810 | skb_queue_purge(&npinfo->arp_tx); | |
4ec93edb | 811 | skb_queue_purge(&npinfo->txq); |
25442caf | 812 | cancel_rearming_delayed_work(&npinfo->tx_work); |
93ec2c72 | 813 | |
17200811 | 814 | /* clean after last, unfinished work */ |
0adc9add | 815 | __skb_queue_purge(&npinfo->txq); |
93ec2c72 | 816 | kfree(npinfo); |
1498b3f1 | 817 | np->dev->npinfo = NULL; |
93ec2c72 | 818 | } |
fbeec2e1 | 819 | } |
93ec2c72 | 820 | |
115c1d6e JM |
821 | dev_put(np->dev); |
822 | } | |
fbeec2e1 | 823 | |
1da177e4 LT |
824 | np->dev = NULL; |
825 | } | |
826 | ||
827 | int netpoll_trap(void) | |
828 | { | |
829 | return atomic_read(&trapped); | |
830 | } | |
831 | ||
832 | void netpoll_set_trap(int trap) | |
833 | { | |
834 | if (trap) | |
835 | atomic_inc(&trapped); | |
836 | else | |
837 | atomic_dec(&trapped); | |
838 | } | |
839 | ||
840 | EXPORT_SYMBOL(netpoll_set_trap); | |
841 | EXPORT_SYMBOL(netpoll_trap); | |
0bcc1816 | 842 | EXPORT_SYMBOL(netpoll_print_options); |
1da177e4 LT |
843 | EXPORT_SYMBOL(netpoll_parse_options); |
844 | EXPORT_SYMBOL(netpoll_setup); | |
845 | EXPORT_SYMBOL(netpoll_cleanup); | |
846 | EXPORT_SYMBOL(netpoll_send_udp); | |
847 | EXPORT_SYMBOL(netpoll_poll); |