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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 | ||
bff38771 | 12 | #include <linux/moduleparam.h> |
1da177e4 LT |
13 | #include <linux/netdevice.h> |
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/string.h> | |
14c85021 | 16 | #include <linux/if_arp.h> |
1da177e4 LT |
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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
1da177e4 LT |
26 | #include <net/tcp.h> |
27 | #include <net/udp.h> | |
28 | #include <asm/unaligned.h> | |
9cbc1cb8 | 29 | #include <trace/events/napi.h> |
1da177e4 LT |
30 | |
31 | /* | |
32 | * We maintain a small pool of fully-sized skbs, to make sure the | |
33 | * message gets out even in extreme OOM situations. | |
34 | */ | |
35 | ||
36 | #define MAX_UDP_CHUNK 1460 | |
37 | #define MAX_SKBS 32 | |
38 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) | |
39 | ||
a1bcfacd | 40 | static struct sk_buff_head skb_pool; |
1da177e4 LT |
41 | |
42 | static atomic_t trapped; | |
43 | ||
2bdfe0ba | 44 | #define USEC_PER_POLL 50 |
d9452e9f DM |
45 | #define NETPOLL_RX_ENABLED 1 |
46 | #define NETPOLL_RX_DROP 2 | |
1da177e4 LT |
47 | |
48 | #define MAX_SKB_SIZE \ | |
49 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
50 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
51 | ||
52 | static void zap_completion_queue(void); | |
068c6e98 | 53 | static void arp_reply(struct sk_buff *skb); |
1da177e4 | 54 | |
bff38771 AV |
55 | static unsigned int carrier_timeout = 4; |
56 | module_param(carrier_timeout, uint, 0644); | |
57 | ||
c4028958 | 58 | static void queue_process(struct work_struct *work) |
1da177e4 | 59 | { |
4c1ac1b4 DH |
60 | struct netpoll_info *npinfo = |
61 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 62 | struct sk_buff *skb; |
3640543d | 63 | unsigned long flags; |
1da177e4 | 64 | |
6c43ff18 SH |
65 | while ((skb = skb_dequeue(&npinfo->txq))) { |
66 | struct net_device *dev = skb->dev; | |
00829823 | 67 | const struct net_device_ops *ops = dev->netdev_ops; |
fd2ea0a7 | 68 | struct netdev_queue *txq; |
1da177e4 | 69 | |
6c43ff18 SH |
70 | if (!netif_device_present(dev) || !netif_running(dev)) { |
71 | __kfree_skb(skb); | |
72 | continue; | |
73 | } | |
1da177e4 | 74 | |
fd2ea0a7 DM |
75 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
76 | ||
3640543d | 77 | local_irq_save(flags); |
fd2ea0a7 DM |
78 | __netif_tx_lock(txq, smp_processor_id()); |
79 | if (netif_tx_queue_stopped(txq) || | |
c3f26a26 | 80 | netif_tx_queue_frozen(txq) || |
00829823 | 81 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
6c43ff18 | 82 | skb_queue_head(&npinfo->txq, skb); |
fd2ea0a7 | 83 | __netif_tx_unlock(txq); |
3640543d | 84 | local_irq_restore(flags); |
1da177e4 | 85 | |
25442caf | 86 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
87 | return; |
88 | } | |
fd2ea0a7 | 89 | __netif_tx_unlock(txq); |
3640543d | 90 | local_irq_restore(flags); |
1da177e4 | 91 | } |
1da177e4 LT |
92 | } |
93 | ||
b51655b9 AV |
94 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
95 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 96 | { |
d6f5493c | 97 | __wsum psum; |
fb286bb2 | 98 | |
60476372 | 99 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
100 | return 0; |
101 | ||
fb286bb2 HX |
102 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
103 | ||
84fa7933 | 104 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 105 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 106 | return 0; |
1da177e4 | 107 | |
fb286bb2 | 108 | skb->csum = psum; |
1da177e4 | 109 | |
fb286bb2 | 110 | return __skb_checksum_complete(skb); |
1da177e4 LT |
111 | } |
112 | ||
113 | /* | |
114 | * Check whether delayed processing was scheduled for our NIC. If so, | |
115 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
116 | * If this fails, either we've recursed in ->poll() or it's already | |
117 | * running on another CPU. | |
118 | * | |
119 | * Note: we don't mask interrupts with this lock because we're using | |
120 | * trylock here and interrupts are already disabled in the softirq | |
121 | * case. Further, we test the poll_owner to avoid recursion on UP | |
122 | * systems where the lock doesn't exist. | |
123 | * | |
124 | * In cases where there is bi-directional communications, reading only | |
125 | * one message at a time can lead to packets being dropped by the | |
126 | * network adapter, forcing superfluous retries and possibly timeouts. | |
127 | * Thus, we set our budget to greater than 1. | |
128 | */ | |
0a7606c1 DM |
129 | static int poll_one_napi(struct netpoll_info *npinfo, |
130 | struct napi_struct *napi, int budget) | |
131 | { | |
132 | int work; | |
133 | ||
134 | /* net_rx_action's ->poll() invocations and our's are | |
135 | * synchronized by this test which is only made while | |
136 | * holding the napi->poll_lock. | |
137 | */ | |
138 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
139 | return budget; | |
140 | ||
d9452e9f | 141 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
0a7606c1 | 142 | atomic_inc(&trapped); |
7b363e44 | 143 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
144 | |
145 | work = napi->poll(napi, budget); | |
7d18f114 | 146 | trace_napi_poll(napi); |
0a7606c1 | 147 | |
7b363e44 | 148 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 | 149 | atomic_dec(&trapped); |
d9452e9f | 150 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
0a7606c1 DM |
151 | |
152 | return budget - work; | |
153 | } | |
154 | ||
5106930b | 155 | static void poll_napi(struct net_device *dev) |
1da177e4 | 156 | { |
bea3348e | 157 | struct napi_struct *napi; |
1da177e4 LT |
158 | int budget = 16; |
159 | ||
5106930b | 160 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 161 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 162 | spin_trylock(&napi->poll_lock)) { |
5106930b | 163 | budget = poll_one_napi(dev->npinfo, napi, budget); |
bea3348e | 164 | spin_unlock(&napi->poll_lock); |
0a7606c1 DM |
165 | |
166 | if (!budget) | |
167 | break; | |
bea3348e | 168 | } |
1da177e4 LT |
169 | } |
170 | } | |
171 | ||
068c6e98 NH |
172 | static void service_arp_queue(struct netpoll_info *npi) |
173 | { | |
5106930b SH |
174 | if (npi) { |
175 | struct sk_buff *skb; | |
068c6e98 | 176 | |
5106930b SH |
177 | while ((skb = skb_dequeue(&npi->arp_tx))) |
178 | arp_reply(skb); | |
068c6e98 | 179 | } |
068c6e98 NH |
180 | } |
181 | ||
1da177e4 LT |
182 | void netpoll_poll(struct netpoll *np) |
183 | { | |
5106930b | 184 | struct net_device *dev = np->dev; |
5e392739 | 185 | const struct net_device_ops *ops; |
5106930b | 186 | |
5e392739 PE |
187 | if (!dev || !netif_running(dev)) |
188 | return; | |
189 | ||
190 | ops = dev->netdev_ops; | |
191 | if (!ops->ndo_poll_controller) | |
1da177e4 LT |
192 | return; |
193 | ||
194 | /* Process pending work on NIC */ | |
d314774c | 195 | ops->ndo_poll_controller(dev); |
5106930b SH |
196 | |
197 | poll_napi(dev); | |
1da177e4 | 198 | |
5106930b | 199 | service_arp_queue(dev->npinfo); |
068c6e98 | 200 | |
1da177e4 LT |
201 | zap_completion_queue(); |
202 | } | |
203 | ||
204 | static void refill_skbs(void) | |
205 | { | |
206 | struct sk_buff *skb; | |
207 | unsigned long flags; | |
208 | ||
a1bcfacd SH |
209 | spin_lock_irqsave(&skb_pool.lock, flags); |
210 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
211 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
212 | if (!skb) | |
213 | break; | |
214 | ||
a1bcfacd | 215 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 216 | } |
a1bcfacd | 217 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
218 | } |
219 | ||
220 | static void zap_completion_queue(void) | |
221 | { | |
222 | unsigned long flags; | |
223 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
224 | ||
225 | if (sd->completion_queue) { | |
226 | struct sk_buff *clist; | |
227 | ||
228 | local_irq_save(flags); | |
229 | clist = sd->completion_queue; | |
230 | sd->completion_queue = NULL; | |
231 | local_irq_restore(flags); | |
232 | ||
233 | while (clist != NULL) { | |
234 | struct sk_buff *skb = clist; | |
235 | clist = clist->next; | |
8a455b08 JP |
236 | if (skb->destructor) { |
237 | atomic_inc(&skb->users); | |
1da177e4 | 238 | dev_kfree_skb_any(skb); /* put this one back */ |
8a455b08 | 239 | } else { |
1da177e4 | 240 | __kfree_skb(skb); |
8a455b08 | 241 | } |
1da177e4 LT |
242 | } |
243 | } | |
244 | ||
245 | put_cpu_var(softnet_data); | |
246 | } | |
247 | ||
a1bcfacd | 248 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 249 | { |
a1bcfacd SH |
250 | int count = 0; |
251 | struct sk_buff *skb; | |
1da177e4 LT |
252 | |
253 | zap_completion_queue(); | |
a1bcfacd | 254 | refill_skbs(); |
1da177e4 | 255 | repeat: |
1da177e4 LT |
256 | |
257 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
258 | if (!skb) |
259 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
260 | |
261 | if (!skb) { | |
a1bcfacd SH |
262 | if (++count < 10) { |
263 | netpoll_poll(np); | |
264 | goto repeat; | |
1da177e4 | 265 | } |
a1bcfacd | 266 | return NULL; |
1da177e4 LT |
267 | } |
268 | ||
269 | atomic_set(&skb->users, 1); | |
270 | skb_reserve(skb, reserve); | |
271 | return skb; | |
272 | } | |
273 | ||
bea3348e SH |
274 | static int netpoll_owner_active(struct net_device *dev) |
275 | { | |
276 | struct napi_struct *napi; | |
277 | ||
278 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
279 | if (napi->poll_owner == smp_processor_id()) | |
280 | return 1; | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
1da177e4 LT |
285 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
286 | { | |
2bdfe0ba SH |
287 | int status = NETDEV_TX_BUSY; |
288 | unsigned long tries; | |
4ec93edb | 289 | struct net_device *dev = np->dev; |
00829823 | 290 | const struct net_device_ops *ops = dev->netdev_ops; |
4ec93edb | 291 | struct netpoll_info *npinfo = np->dev->npinfo; |
2bdfe0ba | 292 | |
4ec93edb YH |
293 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
294 | __kfree_skb(skb); | |
295 | return; | |
296 | } | |
2bdfe0ba SH |
297 | |
298 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 299 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 300 | struct netdev_queue *txq; |
a49f99ff AM |
301 | unsigned long flags; |
302 | ||
fd2ea0a7 DM |
303 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
304 | ||
a49f99ff | 305 | local_irq_save(flags); |
0db3dc73 SH |
306 | /* try until next clock tick */ |
307 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
308 | tries > 0; --tries) { | |
fd2ea0a7 | 309 | if (__netif_tx_trylock(txq)) { |
08baf561 | 310 | if (!netif_tx_queue_stopped(txq)) { |
00829823 | 311 | status = ops->ndo_start_xmit(skb, dev); |
08baf561 ED |
312 | if (status == NETDEV_TX_OK) |
313 | txq_trans_update(txq); | |
314 | } | |
fd2ea0a7 | 315 | __netif_tx_unlock(txq); |
e37b8d93 AM |
316 | |
317 | if (status == NETDEV_TX_OK) | |
318 | break; | |
319 | ||
e37b8d93 | 320 | } |
0db3dc73 SH |
321 | |
322 | /* tickle device maybe there is some cleanup */ | |
323 | netpoll_poll(np); | |
324 | ||
325 | udelay(USEC_PER_POLL); | |
0db1d6fc | 326 | } |
79b1bee8 DD |
327 | |
328 | WARN_ONCE(!irqs_disabled(), | |
329 | "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n", | |
330 | dev->name, ops->ndo_start_xmit); | |
331 | ||
a49f99ff | 332 | local_irq_restore(flags); |
1da177e4 | 333 | } |
1da177e4 | 334 | |
2bdfe0ba | 335 | if (status != NETDEV_TX_OK) { |
5de4a473 | 336 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 337 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 338 | } |
1da177e4 LT |
339 | } |
340 | ||
341 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
342 | { | |
343 | int total_len, eth_len, ip_len, udp_len; | |
344 | struct sk_buff *skb; | |
345 | struct udphdr *udph; | |
346 | struct iphdr *iph; | |
347 | struct ethhdr *eth; | |
348 | ||
349 | udp_len = len + sizeof(*udph); | |
350 | ip_len = eth_len = udp_len + sizeof(*iph); | |
351 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
352 | ||
353 | skb = find_skb(np, total_len, total_len - len); | |
354 | if (!skb) | |
355 | return; | |
356 | ||
27d7ff46 | 357 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
358 | skb->len += len; |
359 | ||
4bedb452 ACM |
360 | skb_push(skb, sizeof(*udph)); |
361 | skb_reset_transport_header(skb); | |
362 | udph = udp_hdr(skb); | |
1da177e4 LT |
363 | udph->source = htons(np->local_port); |
364 | udph->dest = htons(np->remote_port); | |
365 | udph->len = htons(udp_len); | |
366 | udph->check = 0; | |
e7557af5 HH |
367 | udph->check = csum_tcpudp_magic(np->local_ip, |
368 | np->remote_ip, | |
8e365eec | 369 | udp_len, IPPROTO_UDP, |
07f0757a | 370 | csum_partial(udph, udp_len, 0)); |
8e365eec | 371 | if (udph->check == 0) |
5e57dff2 | 372 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 373 | |
e2d1bca7 ACM |
374 | skb_push(skb, sizeof(*iph)); |
375 | skb_reset_network_header(skb); | |
eddc9ec5 | 376 | iph = ip_hdr(skb); |
1da177e4 LT |
377 | |
378 | /* iph->version = 4; iph->ihl = 5; */ | |
379 | put_unaligned(0x45, (unsigned char *)iph); | |
380 | iph->tos = 0; | |
381 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
382 | iph->id = 0; | |
383 | iph->frag_off = 0; | |
384 | iph->ttl = 64; | |
385 | iph->protocol = IPPROTO_UDP; | |
386 | iph->check = 0; | |
e7557af5 HH |
387 | put_unaligned(np->local_ip, &(iph->saddr)); |
388 | put_unaligned(np->remote_ip, &(iph->daddr)); | |
1da177e4 LT |
389 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
390 | ||
391 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 392 | skb_reset_mac_header(skb); |
206daaf7 | 393 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
394 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
395 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
396 | |
397 | skb->dev = np->dev; | |
398 | ||
399 | netpoll_send_skb(np, skb); | |
400 | } | |
401 | ||
402 | static void arp_reply(struct sk_buff *skb) | |
403 | { | |
115c1d6e | 404 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
405 | struct arphdr *arp; |
406 | unsigned char *arp_ptr; | |
407 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 408 | __be32 sip, tip; |
47bbec02 | 409 | unsigned char *sha; |
1da177e4 | 410 | struct sk_buff *send_skb; |
508e14b4 DB |
411 | struct netpoll *np, *tmp; |
412 | unsigned long flags; | |
413 | int hits = 0; | |
414 | ||
415 | if (list_empty(&npinfo->rx_np)) | |
416 | return; | |
417 | ||
418 | /* Before checking the packet, we do some early | |
419 | inspection whether this is interesting at all */ | |
420 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
421 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
422 | if (np->dev == skb->dev) | |
423 | hits++; | |
424 | } | |
425 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 | 426 | |
508e14b4 DB |
427 | /* No netpoll struct is using this dev */ |
428 | if (!hits) | |
115c1d6e | 429 | return; |
1da177e4 LT |
430 | |
431 | /* No arp on this interface */ | |
432 | if (skb->dev->flags & IFF_NOARP) | |
433 | return; | |
434 | ||
988b7050 | 435 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
436 | return; |
437 | ||
c1d2bbe1 | 438 | skb_reset_network_header(skb); |
badff6d0 | 439 | skb_reset_transport_header(skb); |
d0a92be0 | 440 | arp = arp_hdr(skb); |
1da177e4 LT |
441 | |
442 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
443 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
444 | arp->ar_pro != htons(ETH_P_IP) || | |
445 | arp->ar_op != htons(ARPOP_REQUEST)) | |
446 | return; | |
447 | ||
47bbec02 NH |
448 | arp_ptr = (unsigned char *)(arp+1); |
449 | /* save the location of the src hw addr */ | |
450 | sha = arp_ptr; | |
451 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 452 | memcpy(&sip, arp_ptr, 4); |
47bbec02 | 453 | arp_ptr += 4; |
508e14b4 DB |
454 | /* If we actually cared about dst hw addr, |
455 | it would get copied here */ | |
47bbec02 | 456 | arp_ptr += skb->dev->addr_len; |
1da177e4 LT |
457 | memcpy(&tip, arp_ptr, 4); |
458 | ||
459 | /* Should we ignore arp? */ | |
508e14b4 | 460 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
1da177e4 LT |
461 | return; |
462 | ||
988b7050 | 463 | size = arp_hdr_len(skb->dev); |
1da177e4 | 464 | |
508e14b4 DB |
465 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
466 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
467 | if (tip != np->local_ip) | |
468 | continue; | |
1da177e4 | 469 | |
508e14b4 DB |
470 | send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev), |
471 | LL_RESERVED_SPACE(np->dev)); | |
472 | if (!send_skb) | |
473 | continue; | |
1da177e4 | 474 | |
508e14b4 DB |
475 | skb_reset_network_header(send_skb); |
476 | arp = (struct arphdr *) skb_put(send_skb, size); | |
477 | send_skb->dev = skb->dev; | |
478 | send_skb->protocol = htons(ETH_P_ARP); | |
1da177e4 | 479 | |
508e14b4 DB |
480 | /* Fill the device header for the ARP frame */ |
481 | if (dev_hard_header(send_skb, skb->dev, ptype, | |
482 | sha, np->dev->dev_addr, | |
483 | send_skb->len) < 0) { | |
484 | kfree_skb(send_skb); | |
485 | continue; | |
486 | } | |
1da177e4 | 487 | |
508e14b4 DB |
488 | /* |
489 | * Fill out the arp protocol part. | |
490 | * | |
491 | * we only support ethernet device type, | |
492 | * which (according to RFC 1390) should | |
493 | * always equal 1 (Ethernet). | |
494 | */ | |
1da177e4 | 495 | |
508e14b4 DB |
496 | arp->ar_hrd = htons(np->dev->type); |
497 | arp->ar_pro = htons(ETH_P_IP); | |
498 | arp->ar_hln = np->dev->addr_len; | |
499 | arp->ar_pln = 4; | |
500 | arp->ar_op = htons(type); | |
501 | ||
502 | arp_ptr = (unsigned char *)(arp + 1); | |
503 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
504 | arp_ptr += np->dev->addr_len; | |
505 | memcpy(arp_ptr, &tip, 4); | |
506 | arp_ptr += 4; | |
507 | memcpy(arp_ptr, sha, np->dev->addr_len); | |
508 | arp_ptr += np->dev->addr_len; | |
509 | memcpy(arp_ptr, &sip, 4); | |
510 | ||
511 | netpoll_send_skb(np, send_skb); | |
512 | ||
513 | /* If there are several rx_hooks for the same address, | |
514 | we're fine by sending a single reply */ | |
515 | break; | |
516 | } | |
517 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 LT |
518 | } |
519 | ||
520 | int __netpoll_rx(struct sk_buff *skb) | |
521 | { | |
522 | int proto, len, ulen; | |
508e14b4 | 523 | int hits = 0; |
1da177e4 LT |
524 | struct iphdr *iph; |
525 | struct udphdr *uh; | |
508e14b4 DB |
526 | struct netpoll_info *npinfo = skb->dev->npinfo; |
527 | struct netpoll *np, *tmp; | |
068c6e98 | 528 | |
508e14b4 | 529 | if (list_empty(&npinfo->rx_np)) |
1da177e4 | 530 | goto out; |
508e14b4 | 531 | |
1da177e4 LT |
532 | if (skb->dev->type != ARPHRD_ETHER) |
533 | goto out; | |
534 | ||
d9452e9f | 535 | /* check if netpoll clients need ARP */ |
724800d6 | 536 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 537 | atomic_read(&trapped)) { |
508e14b4 | 538 | skb_queue_tail(&npinfo->arp_tx, skb); |
1da177e4 LT |
539 | return 1; |
540 | } | |
541 | ||
542 | proto = ntohs(eth_hdr(skb)->h_proto); | |
543 | if (proto != ETH_P_IP) | |
544 | goto out; | |
545 | if (skb->pkt_type == PACKET_OTHERHOST) | |
546 | goto out; | |
547 | if (skb_shared(skb)) | |
548 | goto out; | |
549 | ||
550 | iph = (struct iphdr *)skb->data; | |
551 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
552 | goto out; | |
553 | if (iph->ihl < 5 || iph->version != 4) | |
554 | goto out; | |
555 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
556 | goto out; | |
557 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
558 | goto out; | |
559 | ||
560 | len = ntohs(iph->tot_len); | |
561 | if (skb->len < len || len < iph->ihl*4) | |
562 | goto out; | |
563 | ||
5e7d7fa5 AL |
564 | /* |
565 | * Our transport medium may have padded the buffer out. | |
566 | * Now We trim to the true length of the frame. | |
567 | */ | |
568 | if (pskb_trim_rcsum(skb, len)) | |
569 | goto out; | |
570 | ||
1da177e4 LT |
571 | if (iph->protocol != IPPROTO_UDP) |
572 | goto out; | |
573 | ||
574 | len -= iph->ihl*4; | |
575 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
576 | ulen = ntohs(uh->len); | |
577 | ||
578 | if (ulen != len) | |
579 | goto out; | |
fb286bb2 | 580 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 | 581 | goto out; |
1da177e4 | 582 | |
508e14b4 DB |
583 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
584 | if (np->local_ip && np->local_ip != iph->daddr) | |
585 | continue; | |
586 | if (np->remote_ip && np->remote_ip != iph->saddr) | |
587 | continue; | |
588 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
589 | continue; | |
590 | ||
591 | np->rx_hook(np, ntohs(uh->source), | |
592 | (char *)(uh+1), | |
593 | ulen - sizeof(struct udphdr)); | |
594 | hits++; | |
595 | } | |
596 | ||
597 | if (!hits) | |
598 | goto out; | |
1da177e4 LT |
599 | |
600 | kfree_skb(skb); | |
601 | return 1; | |
602 | ||
603 | out: | |
604 | if (atomic_read(&trapped)) { | |
605 | kfree_skb(skb); | |
606 | return 1; | |
607 | } | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
0bcc1816 SS |
612 | void netpoll_print_options(struct netpoll *np) |
613 | { | |
614 | printk(KERN_INFO "%s: local port %d\n", | |
615 | np->name, np->local_port); | |
e7557af5 HH |
616 | printk(KERN_INFO "%s: local IP %pI4\n", |
617 | np->name, &np->local_ip); | |
5fc05f87 | 618 | printk(KERN_INFO "%s: interface '%s'\n", |
0bcc1816 SS |
619 | np->name, np->dev_name); |
620 | printk(KERN_INFO "%s: remote port %d\n", | |
621 | np->name, np->remote_port); | |
e7557af5 HH |
622 | printk(KERN_INFO "%s: remote IP %pI4\n", |
623 | np->name, &np->remote_ip); | |
e174961c JB |
624 | printk(KERN_INFO "%s: remote ethernet address %pM\n", |
625 | np->name, np->remote_mac); | |
0bcc1816 SS |
626 | } |
627 | ||
1da177e4 LT |
628 | int netpoll_parse_options(struct netpoll *np, char *opt) |
629 | { | |
630 | char *cur=opt, *delim; | |
631 | ||
c68b9070 | 632 | if (*cur != '@') { |
1da177e4 LT |
633 | if ((delim = strchr(cur, '@')) == NULL) |
634 | goto parse_failed; | |
c68b9070 DM |
635 | *delim = 0; |
636 | np->local_port = simple_strtol(cur, NULL, 10); | |
637 | cur = delim; | |
1da177e4 LT |
638 | } |
639 | cur++; | |
1da177e4 | 640 | |
c68b9070 | 641 | if (*cur != '/') { |
1da177e4 LT |
642 | if ((delim = strchr(cur, '/')) == NULL) |
643 | goto parse_failed; | |
c68b9070 | 644 | *delim = 0; |
e7557af5 | 645 | np->local_ip = in_aton(cur); |
c68b9070 | 646 | cur = delim; |
1da177e4 LT |
647 | } |
648 | cur++; | |
649 | ||
c68b9070 | 650 | if (*cur != ',') { |
1da177e4 LT |
651 | /* parse out dev name */ |
652 | if ((delim = strchr(cur, ',')) == NULL) | |
653 | goto parse_failed; | |
c68b9070 | 654 | *delim = 0; |
1da177e4 | 655 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 656 | cur = delim; |
1da177e4 LT |
657 | } |
658 | cur++; | |
659 | ||
c68b9070 | 660 | if (*cur != '@') { |
1da177e4 LT |
661 | /* dst port */ |
662 | if ((delim = strchr(cur, '@')) == NULL) | |
663 | goto parse_failed; | |
c68b9070 | 664 | *delim = 0; |
5fc05f87 AW |
665 | if (*cur == ' ' || *cur == '\t') |
666 | printk(KERN_INFO "%s: warning: whitespace" | |
667 | "is not allowed\n", np->name); | |
c68b9070 DM |
668 | np->remote_port = simple_strtol(cur, NULL, 10); |
669 | cur = delim; | |
1da177e4 LT |
670 | } |
671 | cur++; | |
1da177e4 LT |
672 | |
673 | /* dst ip */ | |
674 | if ((delim = strchr(cur, '/')) == NULL) | |
675 | goto parse_failed; | |
c68b9070 | 676 | *delim = 0; |
e7557af5 | 677 | np->remote_ip = in_aton(cur); |
c68b9070 | 678 | cur = delim + 1; |
1da177e4 | 679 | |
c68b9070 | 680 | if (*cur != 0) { |
1da177e4 LT |
681 | /* MAC address */ |
682 | if ((delim = strchr(cur, ':')) == NULL) | |
683 | goto parse_failed; | |
c68b9070 DM |
684 | *delim = 0; |
685 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
686 | cur = delim + 1; | |
1da177e4 LT |
687 | if ((delim = strchr(cur, ':')) == NULL) |
688 | goto parse_failed; | |
c68b9070 DM |
689 | *delim = 0; |
690 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
691 | cur = delim + 1; | |
1da177e4 LT |
692 | if ((delim = strchr(cur, ':')) == NULL) |
693 | goto parse_failed; | |
c68b9070 DM |
694 | *delim = 0; |
695 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
696 | cur = delim + 1; | |
1da177e4 LT |
697 | if ((delim = strchr(cur, ':')) == NULL) |
698 | goto parse_failed; | |
c68b9070 DM |
699 | *delim = 0; |
700 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
701 | cur = delim + 1; | |
1da177e4 LT |
702 | if ((delim = strchr(cur, ':')) == NULL) |
703 | goto parse_failed; | |
c68b9070 DM |
704 | *delim = 0; |
705 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
706 | cur = delim + 1; | |
707 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
708 | } |
709 | ||
0bcc1816 | 710 | netpoll_print_options(np); |
1da177e4 LT |
711 | |
712 | return 0; | |
713 | ||
714 | parse_failed: | |
5fc05f87 | 715 | printk(KERN_INFO "%s: couldn't parse config at '%s'!\n", |
1da177e4 LT |
716 | np->name, cur); |
717 | return -1; | |
718 | } | |
719 | ||
720 | int netpoll_setup(struct netpoll *np) | |
721 | { | |
722 | struct net_device *ndev = NULL; | |
723 | struct in_device *in_dev; | |
115c1d6e | 724 | struct netpoll_info *npinfo; |
508e14b4 | 725 | struct netpoll *npe, *tmp; |
fbeec2e1 | 726 | unsigned long flags; |
b41848b6 | 727 | int err; |
1da177e4 LT |
728 | |
729 | if (np->dev_name) | |
881d966b | 730 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 LT |
731 | if (!ndev) { |
732 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
733 | np->name, np->dev_name); | |
b41848b6 | 734 | return -ENODEV; |
1da177e4 LT |
735 | } |
736 | ||
737 | np->dev = ndev; | |
115c1d6e JM |
738 | if (!ndev->npinfo) { |
739 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
740 | if (!npinfo) { |
741 | err = -ENOMEM; | |
21edbb22 | 742 | goto put; |
b41848b6 | 743 | } |
115c1d6e | 744 | |
d9452e9f | 745 | npinfo->rx_flags = 0; |
508e14b4 | 746 | INIT_LIST_HEAD(&npinfo->rx_np); |
2bdfe0ba | 747 | |
a9f6a0dd | 748 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 749 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 750 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 751 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 752 | |
93ec2c72 SH |
753 | atomic_set(&npinfo->refcnt, 1); |
754 | } else { | |
115c1d6e | 755 | npinfo = ndev->npinfo; |
93ec2c72 SH |
756 | atomic_inc(&npinfo->refcnt); |
757 | } | |
1da177e4 | 758 | |
d314774c | 759 | if (!ndev->netdev_ops->ndo_poll_controller) { |
1da177e4 LT |
760 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", |
761 | np->name, np->dev_name); | |
b41848b6 | 762 | err = -ENOTSUPP; |
1da177e4 LT |
763 | goto release; |
764 | } | |
765 | ||
766 | if (!netif_running(ndev)) { | |
767 | unsigned long atmost, atleast; | |
768 | ||
769 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
770 | np->name, np->dev_name); | |
771 | ||
6756ae4b | 772 | rtnl_lock(); |
b41848b6 SH |
773 | err = dev_open(ndev); |
774 | rtnl_unlock(); | |
775 | ||
776 | if (err) { | |
1da177e4 | 777 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 778 | np->name, ndev->name); |
1da177e4 LT |
779 | goto release; |
780 | } | |
1da177e4 LT |
781 | |
782 | atleast = jiffies + HZ/10; | |
bff38771 | 783 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
784 | while (!netif_carrier_ok(ndev)) { |
785 | if (time_after(jiffies, atmost)) { | |
786 | printk(KERN_NOTICE | |
787 | "%s: timeout waiting for carrier\n", | |
788 | np->name); | |
789 | break; | |
790 | } | |
1b614fb9 | 791 | msleep(1); |
1da177e4 LT |
792 | } |
793 | ||
794 | /* If carrier appears to come up instantly, we don't | |
795 | * trust it and pause so that we don't pump all our | |
796 | * queued console messages into the bitbucket. | |
797 | */ | |
798 | ||
799 | if (time_before(jiffies, atleast)) { | |
800 | printk(KERN_NOTICE "%s: carrier detect appears" | |
801 | " untrustworthy, waiting 4 seconds\n", | |
802 | np->name); | |
803 | msleep(4000); | |
804 | } | |
805 | } | |
806 | ||
1da177e4 LT |
807 | if (!np->local_ip) { |
808 | rcu_read_lock(); | |
e5ed6399 | 809 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
810 | |
811 | if (!in_dev || !in_dev->ifa_list) { | |
812 | rcu_read_unlock(); | |
813 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
814 | np->name, np->dev_name); | |
b41848b6 | 815 | err = -EDESTADDRREQ; |
1da177e4 LT |
816 | goto release; |
817 | } | |
818 | ||
e7557af5 | 819 | np->local_ip = in_dev->ifa_list->ifa_local; |
1da177e4 | 820 | rcu_read_unlock(); |
e7557af5 | 821 | printk(KERN_INFO "%s: local IP %pI4\n", np->name, &np->local_ip); |
1da177e4 LT |
822 | } |
823 | ||
fbeec2e1 JM |
824 | if (np->rx_hook) { |
825 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
d9452e9f | 826 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
508e14b4 | 827 | list_add_tail(&np->rx, &npinfo->rx_np); |
fbeec2e1 JM |
828 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
829 | } | |
26520765 IM |
830 | |
831 | /* fill up the skb queue */ | |
832 | refill_skbs(); | |
833 | ||
fbeec2e1 | 834 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 835 | ndev->npinfo = npinfo; |
1da177e4 | 836 | |
53fb95d3 MM |
837 | /* avoid racing with NAPI reading npinfo */ |
838 | synchronize_rcu(); | |
839 | ||
1da177e4 LT |
840 | return 0; |
841 | ||
842 | release: | |
508e14b4 DB |
843 | if (!ndev->npinfo) { |
844 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
845 | list_for_each_entry_safe(npe, tmp, &npinfo->rx_np, rx) { | |
846 | npe->dev = NULL; | |
847 | } | |
848 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
849 | ||
115c1d6e | 850 | kfree(npinfo); |
508e14b4 | 851 | } |
21edbb22 | 852 | put: |
1da177e4 | 853 | dev_put(ndev); |
b41848b6 | 854 | return err; |
1da177e4 LT |
855 | } |
856 | ||
c68b9070 DM |
857 | static int __init netpoll_init(void) |
858 | { | |
a1bcfacd SH |
859 | skb_queue_head_init(&skb_pool); |
860 | return 0; | |
861 | } | |
862 | core_initcall(netpoll_init); | |
863 | ||
1da177e4 LT |
864 | void netpoll_cleanup(struct netpoll *np) |
865 | { | |
fbeec2e1 JM |
866 | struct netpoll_info *npinfo; |
867 | unsigned long flags; | |
868 | ||
115c1d6e | 869 | if (np->dev) { |
fbeec2e1 | 870 | npinfo = np->dev->npinfo; |
93ec2c72 | 871 | if (npinfo) { |
508e14b4 | 872 | if (!list_empty(&npinfo->rx_np)) { |
93ec2c72 | 873 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
508e14b4 DB |
874 | list_del(&np->rx); |
875 | if (list_empty(&npinfo->rx_np)) | |
876 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
93ec2c72 SH |
877 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
878 | } | |
879 | ||
93ec2c72 SH |
880 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
881 | skb_queue_purge(&npinfo->arp_tx); | |
4ec93edb | 882 | skb_queue_purge(&npinfo->txq); |
25442caf | 883 | cancel_rearming_delayed_work(&npinfo->tx_work); |
93ec2c72 | 884 | |
17200811 | 885 | /* clean after last, unfinished work */ |
0adc9add | 886 | __skb_queue_purge(&npinfo->txq); |
93ec2c72 | 887 | kfree(npinfo); |
1498b3f1 | 888 | np->dev->npinfo = NULL; |
93ec2c72 | 889 | } |
fbeec2e1 | 890 | } |
93ec2c72 | 891 | |
115c1d6e JM |
892 | dev_put(np->dev); |
893 | } | |
fbeec2e1 | 894 | |
1da177e4 LT |
895 | np->dev = NULL; |
896 | } | |
897 | ||
898 | int netpoll_trap(void) | |
899 | { | |
900 | return atomic_read(&trapped); | |
901 | } | |
902 | ||
903 | void netpoll_set_trap(int trap) | |
904 | { | |
905 | if (trap) | |
906 | atomic_inc(&trapped); | |
907 | else | |
908 | atomic_dec(&trapped); | |
909 | } | |
910 | ||
911 | EXPORT_SYMBOL(netpoll_set_trap); | |
912 | EXPORT_SYMBOL(netpoll_trap); | |
0bcc1816 | 913 | EXPORT_SYMBOL(netpoll_print_options); |
1da177e4 LT |
914 | EXPORT_SYMBOL(netpoll_parse_options); |
915 | EXPORT_SYMBOL(netpoll_setup); | |
916 | EXPORT_SYMBOL(netpoll_cleanup); | |
917 | EXPORT_SYMBOL(netpoll_send_udp); | |
918 | EXPORT_SYMBOL(netpoll_poll); |