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> | |
9cbc1cb8 | 27 | #include <trace/events/napi.h> |
1da177e4 LT |
28 | |
29 | /* | |
30 | * We maintain a small pool of fully-sized skbs, to make sure the | |
31 | * message gets out even in extreme OOM situations. | |
32 | */ | |
33 | ||
34 | #define MAX_UDP_CHUNK 1460 | |
35 | #define MAX_SKBS 32 | |
36 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) | |
37 | ||
a1bcfacd | 38 | static struct sk_buff_head skb_pool; |
1da177e4 LT |
39 | |
40 | static atomic_t trapped; | |
41 | ||
2bdfe0ba | 42 | #define USEC_PER_POLL 50 |
d9452e9f DM |
43 | #define NETPOLL_RX_ENABLED 1 |
44 | #define NETPOLL_RX_DROP 2 | |
1da177e4 LT |
45 | |
46 | #define MAX_SKB_SIZE \ | |
47 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
48 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
49 | ||
50 | static void zap_completion_queue(void); | |
068c6e98 | 51 | static void arp_reply(struct sk_buff *skb); |
1da177e4 | 52 | |
c4028958 | 53 | static void queue_process(struct work_struct *work) |
1da177e4 | 54 | { |
4c1ac1b4 DH |
55 | struct netpoll_info *npinfo = |
56 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 57 | struct sk_buff *skb; |
3640543d | 58 | unsigned long flags; |
1da177e4 | 59 | |
6c43ff18 SH |
60 | while ((skb = skb_dequeue(&npinfo->txq))) { |
61 | struct net_device *dev = skb->dev; | |
00829823 | 62 | const struct net_device_ops *ops = dev->netdev_ops; |
fd2ea0a7 | 63 | struct netdev_queue *txq; |
1da177e4 | 64 | |
6c43ff18 SH |
65 | if (!netif_device_present(dev) || !netif_running(dev)) { |
66 | __kfree_skb(skb); | |
67 | continue; | |
68 | } | |
1da177e4 | 69 | |
fd2ea0a7 DM |
70 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
71 | ||
3640543d | 72 | local_irq_save(flags); |
fd2ea0a7 DM |
73 | __netif_tx_lock(txq, smp_processor_id()); |
74 | if (netif_tx_queue_stopped(txq) || | |
c3f26a26 | 75 | netif_tx_queue_frozen(txq) || |
00829823 | 76 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
6c43ff18 | 77 | skb_queue_head(&npinfo->txq, skb); |
fd2ea0a7 | 78 | __netif_tx_unlock(txq); |
3640543d | 79 | local_irq_restore(flags); |
1da177e4 | 80 | |
25442caf | 81 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
82 | return; |
83 | } | |
fd2ea0a7 | 84 | __netif_tx_unlock(txq); |
3640543d | 85 | local_irq_restore(flags); |
1da177e4 | 86 | } |
1da177e4 LT |
87 | } |
88 | ||
b51655b9 AV |
89 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
90 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 91 | { |
d6f5493c | 92 | __wsum psum; |
fb286bb2 | 93 | |
60476372 | 94 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
95 | return 0; |
96 | ||
fb286bb2 HX |
97 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
98 | ||
84fa7933 | 99 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 100 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 101 | return 0; |
1da177e4 | 102 | |
fb286bb2 | 103 | skb->csum = psum; |
1da177e4 | 104 | |
fb286bb2 | 105 | return __skb_checksum_complete(skb); |
1da177e4 LT |
106 | } |
107 | ||
108 | /* | |
109 | * Check whether delayed processing was scheduled for our NIC. If so, | |
110 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
111 | * If this fails, either we've recursed in ->poll() or it's already | |
112 | * running on another CPU. | |
113 | * | |
114 | * Note: we don't mask interrupts with this lock because we're using | |
115 | * trylock here and interrupts are already disabled in the softirq | |
116 | * case. Further, we test the poll_owner to avoid recursion on UP | |
117 | * systems where the lock doesn't exist. | |
118 | * | |
119 | * In cases where there is bi-directional communications, reading only | |
120 | * one message at a time can lead to packets being dropped by the | |
121 | * network adapter, forcing superfluous retries and possibly timeouts. | |
122 | * Thus, we set our budget to greater than 1. | |
123 | */ | |
0a7606c1 DM |
124 | static int poll_one_napi(struct netpoll_info *npinfo, |
125 | struct napi_struct *napi, int budget) | |
126 | { | |
127 | int work; | |
128 | ||
129 | /* net_rx_action's ->poll() invocations and our's are | |
130 | * synchronized by this test which is only made while | |
131 | * holding the napi->poll_lock. | |
132 | */ | |
133 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
134 | return budget; | |
135 | ||
d9452e9f | 136 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
0a7606c1 | 137 | atomic_inc(&trapped); |
7b363e44 | 138 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
139 | |
140 | work = napi->poll(napi, budget); | |
7d18f114 | 141 | trace_napi_poll(napi); |
0a7606c1 | 142 | |
7b363e44 | 143 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 | 144 | atomic_dec(&trapped); |
d9452e9f | 145 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
0a7606c1 DM |
146 | |
147 | return budget - work; | |
148 | } | |
149 | ||
5106930b | 150 | static void poll_napi(struct net_device *dev) |
1da177e4 | 151 | { |
bea3348e | 152 | struct napi_struct *napi; |
1da177e4 LT |
153 | int budget = 16; |
154 | ||
5106930b | 155 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 156 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 157 | spin_trylock(&napi->poll_lock)) { |
5106930b | 158 | budget = poll_one_napi(dev->npinfo, napi, budget); |
bea3348e | 159 | spin_unlock(&napi->poll_lock); |
0a7606c1 DM |
160 | |
161 | if (!budget) | |
162 | break; | |
bea3348e | 163 | } |
1da177e4 LT |
164 | } |
165 | } | |
166 | ||
068c6e98 NH |
167 | static void service_arp_queue(struct netpoll_info *npi) |
168 | { | |
5106930b SH |
169 | if (npi) { |
170 | struct sk_buff *skb; | |
068c6e98 | 171 | |
5106930b SH |
172 | while ((skb = skb_dequeue(&npi->arp_tx))) |
173 | arp_reply(skb); | |
068c6e98 | 174 | } |
068c6e98 NH |
175 | } |
176 | ||
1da177e4 LT |
177 | void netpoll_poll(struct netpoll *np) |
178 | { | |
5106930b | 179 | struct net_device *dev = np->dev; |
5e392739 | 180 | const struct net_device_ops *ops; |
5106930b | 181 | |
5e392739 PE |
182 | if (!dev || !netif_running(dev)) |
183 | return; | |
184 | ||
185 | ops = dev->netdev_ops; | |
186 | if (!ops->ndo_poll_controller) | |
1da177e4 LT |
187 | return; |
188 | ||
189 | /* Process pending work on NIC */ | |
d314774c | 190 | ops->ndo_poll_controller(dev); |
5106930b SH |
191 | |
192 | poll_napi(dev); | |
1da177e4 | 193 | |
5106930b | 194 | service_arp_queue(dev->npinfo); |
068c6e98 | 195 | |
1da177e4 LT |
196 | zap_completion_queue(); |
197 | } | |
198 | ||
199 | static void refill_skbs(void) | |
200 | { | |
201 | struct sk_buff *skb; | |
202 | unsigned long flags; | |
203 | ||
a1bcfacd SH |
204 | spin_lock_irqsave(&skb_pool.lock, flags); |
205 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
206 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
207 | if (!skb) | |
208 | break; | |
209 | ||
a1bcfacd | 210 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 211 | } |
a1bcfacd | 212 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
213 | } |
214 | ||
215 | static void zap_completion_queue(void) | |
216 | { | |
217 | unsigned long flags; | |
218 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
219 | ||
220 | if (sd->completion_queue) { | |
221 | struct sk_buff *clist; | |
222 | ||
223 | local_irq_save(flags); | |
224 | clist = sd->completion_queue; | |
225 | sd->completion_queue = NULL; | |
226 | local_irq_restore(flags); | |
227 | ||
228 | while (clist != NULL) { | |
229 | struct sk_buff *skb = clist; | |
230 | clist = clist->next; | |
8a455b08 JP |
231 | if (skb->destructor) { |
232 | atomic_inc(&skb->users); | |
1da177e4 | 233 | dev_kfree_skb_any(skb); /* put this one back */ |
8a455b08 | 234 | } else { |
1da177e4 | 235 | __kfree_skb(skb); |
8a455b08 | 236 | } |
1da177e4 LT |
237 | } |
238 | } | |
239 | ||
240 | put_cpu_var(softnet_data); | |
241 | } | |
242 | ||
a1bcfacd | 243 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 244 | { |
a1bcfacd SH |
245 | int count = 0; |
246 | struct sk_buff *skb; | |
1da177e4 LT |
247 | |
248 | zap_completion_queue(); | |
a1bcfacd | 249 | refill_skbs(); |
1da177e4 | 250 | repeat: |
1da177e4 LT |
251 | |
252 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
253 | if (!skb) |
254 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
255 | |
256 | if (!skb) { | |
a1bcfacd SH |
257 | if (++count < 10) { |
258 | netpoll_poll(np); | |
259 | goto repeat; | |
1da177e4 | 260 | } |
a1bcfacd | 261 | return NULL; |
1da177e4 LT |
262 | } |
263 | ||
264 | atomic_set(&skb->users, 1); | |
265 | skb_reserve(skb, reserve); | |
266 | return skb; | |
267 | } | |
268 | ||
bea3348e SH |
269 | static int netpoll_owner_active(struct net_device *dev) |
270 | { | |
271 | struct napi_struct *napi; | |
272 | ||
273 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
274 | if (napi->poll_owner == smp_processor_id()) | |
275 | return 1; | |
276 | } | |
277 | return 0; | |
278 | } | |
279 | ||
1da177e4 LT |
280 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
281 | { | |
2bdfe0ba SH |
282 | int status = NETDEV_TX_BUSY; |
283 | unsigned long tries; | |
4ec93edb | 284 | struct net_device *dev = np->dev; |
00829823 | 285 | const struct net_device_ops *ops = dev->netdev_ops; |
4ec93edb | 286 | struct netpoll_info *npinfo = np->dev->npinfo; |
2bdfe0ba | 287 | |
4ec93edb YH |
288 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
289 | __kfree_skb(skb); | |
290 | return; | |
291 | } | |
2bdfe0ba SH |
292 | |
293 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 294 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 295 | struct netdev_queue *txq; |
a49f99ff AM |
296 | unsigned long flags; |
297 | ||
fd2ea0a7 DM |
298 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
299 | ||
a49f99ff | 300 | local_irq_save(flags); |
0db3dc73 SH |
301 | /* try until next clock tick */ |
302 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
303 | tries > 0; --tries) { | |
fd2ea0a7 | 304 | if (__netif_tx_trylock(txq)) { |
08baf561 | 305 | if (!netif_tx_queue_stopped(txq)) { |
00829823 | 306 | status = ops->ndo_start_xmit(skb, dev); |
08baf561 ED |
307 | if (status == NETDEV_TX_OK) |
308 | txq_trans_update(txq); | |
309 | } | |
fd2ea0a7 | 310 | __netif_tx_unlock(txq); |
e37b8d93 AM |
311 | |
312 | if (status == NETDEV_TX_OK) | |
313 | break; | |
314 | ||
e37b8d93 | 315 | } |
0db3dc73 SH |
316 | |
317 | /* tickle device maybe there is some cleanup */ | |
318 | netpoll_poll(np); | |
319 | ||
320 | udelay(USEC_PER_POLL); | |
0db1d6fc | 321 | } |
a49f99ff | 322 | local_irq_restore(flags); |
1da177e4 | 323 | } |
1da177e4 | 324 | |
2bdfe0ba | 325 | if (status != NETDEV_TX_OK) { |
5de4a473 | 326 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 327 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 328 | } |
1da177e4 LT |
329 | } |
330 | ||
331 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
332 | { | |
333 | int total_len, eth_len, ip_len, udp_len; | |
334 | struct sk_buff *skb; | |
335 | struct udphdr *udph; | |
336 | struct iphdr *iph; | |
337 | struct ethhdr *eth; | |
338 | ||
339 | udp_len = len + sizeof(*udph); | |
340 | ip_len = eth_len = udp_len + sizeof(*iph); | |
341 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
342 | ||
343 | skb = find_skb(np, total_len, total_len - len); | |
344 | if (!skb) | |
345 | return; | |
346 | ||
27d7ff46 | 347 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
348 | skb->len += len; |
349 | ||
4bedb452 ACM |
350 | skb_push(skb, sizeof(*udph)); |
351 | skb_reset_transport_header(skb); | |
352 | udph = udp_hdr(skb); | |
1da177e4 LT |
353 | udph->source = htons(np->local_port); |
354 | udph->dest = htons(np->remote_port); | |
355 | udph->len = htons(udp_len); | |
356 | udph->check = 0; | |
e7557af5 HH |
357 | udph->check = csum_tcpudp_magic(np->local_ip, |
358 | np->remote_ip, | |
8e365eec | 359 | udp_len, IPPROTO_UDP, |
07f0757a | 360 | csum_partial(udph, udp_len, 0)); |
8e365eec | 361 | if (udph->check == 0) |
5e57dff2 | 362 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 363 | |
e2d1bca7 ACM |
364 | skb_push(skb, sizeof(*iph)); |
365 | skb_reset_network_header(skb); | |
eddc9ec5 | 366 | iph = ip_hdr(skb); |
1da177e4 LT |
367 | |
368 | /* iph->version = 4; iph->ihl = 5; */ | |
369 | put_unaligned(0x45, (unsigned char *)iph); | |
370 | iph->tos = 0; | |
371 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
372 | iph->id = 0; | |
373 | iph->frag_off = 0; | |
374 | iph->ttl = 64; | |
375 | iph->protocol = IPPROTO_UDP; | |
376 | iph->check = 0; | |
e7557af5 HH |
377 | put_unaligned(np->local_ip, &(iph->saddr)); |
378 | put_unaligned(np->remote_ip, &(iph->daddr)); | |
1da177e4 LT |
379 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
380 | ||
381 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 382 | skb_reset_mac_header(skb); |
206daaf7 | 383 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
384 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
385 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
386 | |
387 | skb->dev = np->dev; | |
388 | ||
389 | netpoll_send_skb(np, skb); | |
390 | } | |
391 | ||
392 | static void arp_reply(struct sk_buff *skb) | |
393 | { | |
115c1d6e | 394 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
395 | struct arphdr *arp; |
396 | unsigned char *arp_ptr; | |
397 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 398 | __be32 sip, tip; |
47bbec02 | 399 | unsigned char *sha; |
1da177e4 | 400 | struct sk_buff *send_skb; |
115c1d6e | 401 | struct netpoll *np = NULL; |
1da177e4 | 402 | |
fbeec2e1 JM |
403 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
404 | np = npinfo->rx_np; | |
115c1d6e JM |
405 | if (!np) |
406 | return; | |
1da177e4 LT |
407 | |
408 | /* No arp on this interface */ | |
409 | if (skb->dev->flags & IFF_NOARP) | |
410 | return; | |
411 | ||
988b7050 | 412 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
413 | return; |
414 | ||
c1d2bbe1 | 415 | skb_reset_network_header(skb); |
badff6d0 | 416 | skb_reset_transport_header(skb); |
d0a92be0 | 417 | arp = arp_hdr(skb); |
1da177e4 LT |
418 | |
419 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
420 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
421 | arp->ar_pro != htons(ETH_P_IP) || | |
422 | arp->ar_op != htons(ARPOP_REQUEST)) | |
423 | return; | |
424 | ||
47bbec02 NH |
425 | arp_ptr = (unsigned char *)(arp+1); |
426 | /* save the location of the src hw addr */ | |
427 | sha = arp_ptr; | |
428 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 429 | memcpy(&sip, arp_ptr, 4); |
47bbec02 NH |
430 | arp_ptr += 4; |
431 | /* if we actually cared about dst hw addr, it would get copied here */ | |
432 | arp_ptr += skb->dev->addr_len; | |
1da177e4 LT |
433 | memcpy(&tip, arp_ptr, 4); |
434 | ||
435 | /* Should we ignore arp? */ | |
e7557af5 | 436 | if (tip != np->local_ip || |
21cf2253 | 437 | ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
1da177e4 LT |
438 | return; |
439 | ||
988b7050 | 440 | size = arp_hdr_len(skb->dev); |
f5184d26 | 441 | send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev), |
1da177e4 LT |
442 | LL_RESERVED_SPACE(np->dev)); |
443 | ||
444 | if (!send_skb) | |
445 | return; | |
446 | ||
c1d2bbe1 | 447 | skb_reset_network_header(send_skb); |
1da177e4 LT |
448 | arp = (struct arphdr *) skb_put(send_skb, size); |
449 | send_skb->dev = skb->dev; | |
450 | send_skb->protocol = htons(ETH_P_ARP); | |
451 | ||
452 | /* Fill the device header for the ARP frame */ | |
0c4e8581 | 453 | if (dev_hard_header(send_skb, skb->dev, ptype, |
09538641 | 454 | sha, np->dev->dev_addr, |
0c4e8581 | 455 | send_skb->len) < 0) { |
1da177e4 LT |
456 | kfree_skb(send_skb); |
457 | return; | |
458 | } | |
459 | ||
460 | /* | |
461 | * Fill out the arp protocol part. | |
462 | * | |
463 | * we only support ethernet device type, | |
464 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
465 | */ | |
466 | ||
467 | arp->ar_hrd = htons(np->dev->type); | |
468 | arp->ar_pro = htons(ETH_P_IP); | |
469 | arp->ar_hln = np->dev->addr_len; | |
470 | arp->ar_pln = 4; | |
471 | arp->ar_op = htons(type); | |
472 | ||
473 | arp_ptr=(unsigned char *)(arp + 1); | |
474 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
475 | arp_ptr += np->dev->addr_len; | |
476 | memcpy(arp_ptr, &tip, 4); | |
477 | arp_ptr += 4; | |
47bbec02 | 478 | memcpy(arp_ptr, sha, np->dev->addr_len); |
1da177e4 LT |
479 | arp_ptr += np->dev->addr_len; |
480 | memcpy(arp_ptr, &sip, 4); | |
481 | ||
482 | netpoll_send_skb(np, send_skb); | |
483 | } | |
484 | ||
485 | int __netpoll_rx(struct sk_buff *skb) | |
486 | { | |
487 | int proto, len, ulen; | |
488 | struct iphdr *iph; | |
489 | struct udphdr *uh; | |
068c6e98 NH |
490 | struct netpoll_info *npi = skb->dev->npinfo; |
491 | struct netpoll *np = npi->rx_np; | |
492 | ||
fbeec2e1 | 493 | if (!np) |
1da177e4 LT |
494 | goto out; |
495 | if (skb->dev->type != ARPHRD_ETHER) | |
496 | goto out; | |
497 | ||
d9452e9f | 498 | /* check if netpoll clients need ARP */ |
724800d6 | 499 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 500 | atomic_read(&trapped)) { |
068c6e98 | 501 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
502 | return 1; |
503 | } | |
504 | ||
505 | proto = ntohs(eth_hdr(skb)->h_proto); | |
506 | if (proto != ETH_P_IP) | |
507 | goto out; | |
508 | if (skb->pkt_type == PACKET_OTHERHOST) | |
509 | goto out; | |
510 | if (skb_shared(skb)) | |
511 | goto out; | |
512 | ||
513 | iph = (struct iphdr *)skb->data; | |
514 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
515 | goto out; | |
516 | if (iph->ihl < 5 || iph->version != 4) | |
517 | goto out; | |
518 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
519 | goto out; | |
520 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
521 | goto out; | |
522 | ||
523 | len = ntohs(iph->tot_len); | |
524 | if (skb->len < len || len < iph->ihl*4) | |
525 | goto out; | |
526 | ||
5e7d7fa5 AL |
527 | /* |
528 | * Our transport medium may have padded the buffer out. | |
529 | * Now We trim to the true length of the frame. | |
530 | */ | |
531 | if (pskb_trim_rcsum(skb, len)) | |
532 | goto out; | |
533 | ||
1da177e4 LT |
534 | if (iph->protocol != IPPROTO_UDP) |
535 | goto out; | |
536 | ||
537 | len -= iph->ihl*4; | |
538 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
539 | ulen = ntohs(uh->len); | |
540 | ||
541 | if (ulen != len) | |
542 | goto out; | |
fb286bb2 | 543 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 | 544 | goto out; |
e7557af5 | 545 | if (np->local_ip && np->local_ip != iph->daddr) |
1da177e4 | 546 | goto out; |
e7557af5 | 547 | if (np->remote_ip && np->remote_ip != iph->saddr) |
1da177e4 LT |
548 | goto out; |
549 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
550 | goto out; | |
551 | ||
552 | np->rx_hook(np, ntohs(uh->source), | |
553 | (char *)(uh+1), | |
554 | ulen - sizeof(struct udphdr)); | |
555 | ||
556 | kfree_skb(skb); | |
557 | return 1; | |
558 | ||
559 | out: | |
560 | if (atomic_read(&trapped)) { | |
561 | kfree_skb(skb); | |
562 | return 1; | |
563 | } | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
0bcc1816 SS |
568 | void netpoll_print_options(struct netpoll *np) |
569 | { | |
570 | printk(KERN_INFO "%s: local port %d\n", | |
571 | np->name, np->local_port); | |
e7557af5 HH |
572 | printk(KERN_INFO "%s: local IP %pI4\n", |
573 | np->name, &np->local_ip); | |
0bcc1816 SS |
574 | printk(KERN_INFO "%s: interface %s\n", |
575 | np->name, np->dev_name); | |
576 | printk(KERN_INFO "%s: remote port %d\n", | |
577 | np->name, np->remote_port); | |
e7557af5 HH |
578 | printk(KERN_INFO "%s: remote IP %pI4\n", |
579 | np->name, &np->remote_ip); | |
e174961c JB |
580 | printk(KERN_INFO "%s: remote ethernet address %pM\n", |
581 | np->name, np->remote_mac); | |
0bcc1816 SS |
582 | } |
583 | ||
1da177e4 LT |
584 | int netpoll_parse_options(struct netpoll *np, char *opt) |
585 | { | |
586 | char *cur=opt, *delim; | |
587 | ||
c68b9070 | 588 | if (*cur != '@') { |
1da177e4 LT |
589 | if ((delim = strchr(cur, '@')) == NULL) |
590 | goto parse_failed; | |
c68b9070 DM |
591 | *delim = 0; |
592 | np->local_port = simple_strtol(cur, NULL, 10); | |
593 | cur = delim; | |
1da177e4 LT |
594 | } |
595 | cur++; | |
1da177e4 | 596 | |
c68b9070 | 597 | if (*cur != '/') { |
1da177e4 LT |
598 | if ((delim = strchr(cur, '/')) == NULL) |
599 | goto parse_failed; | |
c68b9070 | 600 | *delim = 0; |
e7557af5 | 601 | np->local_ip = in_aton(cur); |
c68b9070 | 602 | cur = delim; |
1da177e4 LT |
603 | } |
604 | cur++; | |
605 | ||
c68b9070 | 606 | if (*cur != ',') { |
1da177e4 LT |
607 | /* parse out dev name */ |
608 | if ((delim = strchr(cur, ',')) == NULL) | |
609 | goto parse_failed; | |
c68b9070 | 610 | *delim = 0; |
1da177e4 | 611 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 612 | cur = delim; |
1da177e4 LT |
613 | } |
614 | cur++; | |
615 | ||
c68b9070 | 616 | if (*cur != '@') { |
1da177e4 LT |
617 | /* dst port */ |
618 | if ((delim = strchr(cur, '@')) == NULL) | |
619 | goto parse_failed; | |
c68b9070 DM |
620 | *delim = 0; |
621 | np->remote_port = simple_strtol(cur, NULL, 10); | |
622 | cur = delim; | |
1da177e4 LT |
623 | } |
624 | cur++; | |
1da177e4 LT |
625 | |
626 | /* dst ip */ | |
627 | if ((delim = strchr(cur, '/')) == NULL) | |
628 | goto parse_failed; | |
c68b9070 | 629 | *delim = 0; |
e7557af5 | 630 | np->remote_ip = in_aton(cur); |
c68b9070 | 631 | cur = delim + 1; |
1da177e4 | 632 | |
c68b9070 | 633 | if (*cur != 0) { |
1da177e4 LT |
634 | /* MAC address */ |
635 | if ((delim = strchr(cur, ':')) == NULL) | |
636 | goto parse_failed; | |
c68b9070 DM |
637 | *delim = 0; |
638 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
639 | cur = delim + 1; | |
1da177e4 LT |
640 | if ((delim = strchr(cur, ':')) == NULL) |
641 | goto parse_failed; | |
c68b9070 DM |
642 | *delim = 0; |
643 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
644 | cur = delim + 1; | |
1da177e4 LT |
645 | if ((delim = strchr(cur, ':')) == NULL) |
646 | goto parse_failed; | |
c68b9070 DM |
647 | *delim = 0; |
648 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
649 | cur = delim + 1; | |
1da177e4 LT |
650 | if ((delim = strchr(cur, ':')) == NULL) |
651 | goto parse_failed; | |
c68b9070 DM |
652 | *delim = 0; |
653 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
654 | cur = delim + 1; | |
1da177e4 LT |
655 | if ((delim = strchr(cur, ':')) == NULL) |
656 | goto parse_failed; | |
c68b9070 DM |
657 | *delim = 0; |
658 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
659 | cur = delim + 1; | |
660 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
661 | } |
662 | ||
0bcc1816 | 663 | netpoll_print_options(np); |
1da177e4 LT |
664 | |
665 | return 0; | |
666 | ||
667 | parse_failed: | |
668 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
669 | np->name, cur); | |
670 | return -1; | |
671 | } | |
672 | ||
673 | int netpoll_setup(struct netpoll *np) | |
674 | { | |
675 | struct net_device *ndev = NULL; | |
676 | struct in_device *in_dev; | |
115c1d6e | 677 | struct netpoll_info *npinfo; |
fbeec2e1 | 678 | unsigned long flags; |
b41848b6 | 679 | int err; |
1da177e4 LT |
680 | |
681 | if (np->dev_name) | |
881d966b | 682 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 LT |
683 | if (!ndev) { |
684 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
685 | np->name, np->dev_name); | |
b41848b6 | 686 | return -ENODEV; |
1da177e4 LT |
687 | } |
688 | ||
689 | np->dev = ndev; | |
115c1d6e JM |
690 | if (!ndev->npinfo) { |
691 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
692 | if (!npinfo) { |
693 | err = -ENOMEM; | |
115c1d6e | 694 | goto release; |
b41848b6 | 695 | } |
115c1d6e | 696 | |
d9452e9f | 697 | npinfo->rx_flags = 0; |
fbeec2e1 | 698 | npinfo->rx_np = NULL; |
2bdfe0ba | 699 | |
a9f6a0dd | 700 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 701 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 702 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 703 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 704 | |
93ec2c72 SH |
705 | atomic_set(&npinfo->refcnt, 1); |
706 | } else { | |
115c1d6e | 707 | npinfo = ndev->npinfo; |
93ec2c72 SH |
708 | atomic_inc(&npinfo->refcnt); |
709 | } | |
1da177e4 | 710 | |
d314774c | 711 | if (!ndev->netdev_ops->ndo_poll_controller) { |
1da177e4 LT |
712 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", |
713 | np->name, np->dev_name); | |
b41848b6 | 714 | err = -ENOTSUPP; |
1da177e4 LT |
715 | goto release; |
716 | } | |
717 | ||
718 | if (!netif_running(ndev)) { | |
719 | unsigned long atmost, atleast; | |
720 | ||
721 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
722 | np->name, np->dev_name); | |
723 | ||
6756ae4b | 724 | rtnl_lock(); |
b41848b6 SH |
725 | err = dev_open(ndev); |
726 | rtnl_unlock(); | |
727 | ||
728 | if (err) { | |
1da177e4 | 729 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 730 | np->name, ndev->name); |
1da177e4 LT |
731 | goto release; |
732 | } | |
1da177e4 LT |
733 | |
734 | atleast = jiffies + HZ/10; | |
4ec93edb | 735 | atmost = jiffies + 4*HZ; |
1da177e4 LT |
736 | while (!netif_carrier_ok(ndev)) { |
737 | if (time_after(jiffies, atmost)) { | |
738 | printk(KERN_NOTICE | |
739 | "%s: timeout waiting for carrier\n", | |
740 | np->name); | |
741 | break; | |
742 | } | |
743 | cond_resched(); | |
744 | } | |
745 | ||
746 | /* If carrier appears to come up instantly, we don't | |
747 | * trust it and pause so that we don't pump all our | |
748 | * queued console messages into the bitbucket. | |
749 | */ | |
750 | ||
751 | if (time_before(jiffies, atleast)) { | |
752 | printk(KERN_NOTICE "%s: carrier detect appears" | |
753 | " untrustworthy, waiting 4 seconds\n", | |
754 | np->name); | |
755 | msleep(4000); | |
756 | } | |
757 | } | |
758 | ||
1da177e4 LT |
759 | if (!np->local_ip) { |
760 | rcu_read_lock(); | |
e5ed6399 | 761 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
762 | |
763 | if (!in_dev || !in_dev->ifa_list) { | |
764 | rcu_read_unlock(); | |
765 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
766 | np->name, np->dev_name); | |
b41848b6 | 767 | err = -EDESTADDRREQ; |
1da177e4 LT |
768 | goto release; |
769 | } | |
770 | ||
e7557af5 | 771 | np->local_ip = in_dev->ifa_list->ifa_local; |
1da177e4 | 772 | rcu_read_unlock(); |
e7557af5 | 773 | printk(KERN_INFO "%s: local IP %pI4\n", np->name, &np->local_ip); |
1da177e4 LT |
774 | } |
775 | ||
fbeec2e1 JM |
776 | if (np->rx_hook) { |
777 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
d9452e9f | 778 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
fbeec2e1 JM |
779 | npinfo->rx_np = np; |
780 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
781 | } | |
26520765 IM |
782 | |
783 | /* fill up the skb queue */ | |
784 | refill_skbs(); | |
785 | ||
fbeec2e1 | 786 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 787 | ndev->npinfo = npinfo; |
1da177e4 | 788 | |
53fb95d3 MM |
789 | /* avoid racing with NAPI reading npinfo */ |
790 | synchronize_rcu(); | |
791 | ||
1da177e4 LT |
792 | return 0; |
793 | ||
794 | release: | |
115c1d6e JM |
795 | if (!ndev->npinfo) |
796 | kfree(npinfo); | |
1da177e4 LT |
797 | np->dev = NULL; |
798 | dev_put(ndev); | |
b41848b6 | 799 | return err; |
1da177e4 LT |
800 | } |
801 | ||
c68b9070 DM |
802 | static int __init netpoll_init(void) |
803 | { | |
a1bcfacd SH |
804 | skb_queue_head_init(&skb_pool); |
805 | return 0; | |
806 | } | |
807 | core_initcall(netpoll_init); | |
808 | ||
1da177e4 LT |
809 | void netpoll_cleanup(struct netpoll *np) |
810 | { | |
fbeec2e1 JM |
811 | struct netpoll_info *npinfo; |
812 | unsigned long flags; | |
813 | ||
115c1d6e | 814 | if (np->dev) { |
fbeec2e1 | 815 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
816 | if (npinfo) { |
817 | if (npinfo->rx_np == np) { | |
818 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
819 | npinfo->rx_np = NULL; | |
d9452e9f | 820 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; |
93ec2c72 SH |
821 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
822 | } | |
823 | ||
93ec2c72 SH |
824 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
825 | skb_queue_purge(&npinfo->arp_tx); | |
4ec93edb | 826 | skb_queue_purge(&npinfo->txq); |
25442caf | 827 | cancel_rearming_delayed_work(&npinfo->tx_work); |
93ec2c72 | 828 | |
17200811 | 829 | /* clean after last, unfinished work */ |
0adc9add | 830 | __skb_queue_purge(&npinfo->txq); |
93ec2c72 | 831 | kfree(npinfo); |
1498b3f1 | 832 | np->dev->npinfo = NULL; |
93ec2c72 | 833 | } |
fbeec2e1 | 834 | } |
93ec2c72 | 835 | |
115c1d6e JM |
836 | dev_put(np->dev); |
837 | } | |
fbeec2e1 | 838 | |
1da177e4 LT |
839 | np->dev = NULL; |
840 | } | |
841 | ||
842 | int netpoll_trap(void) | |
843 | { | |
844 | return atomic_read(&trapped); | |
845 | } | |
846 | ||
847 | void netpoll_set_trap(int trap) | |
848 | { | |
849 | if (trap) | |
850 | atomic_inc(&trapped); | |
851 | else | |
852 | atomic_dec(&trapped); | |
853 | } | |
854 | ||
855 | EXPORT_SYMBOL(netpoll_set_trap); | |
856 | EXPORT_SYMBOL(netpoll_trap); | |
0bcc1816 | 857 | EXPORT_SYMBOL(netpoll_print_options); |
1da177e4 LT |
858 | EXPORT_SYMBOL(netpoll_parse_options); |
859 | EXPORT_SYMBOL(netpoll_setup); | |
860 | EXPORT_SYMBOL(netpoll_cleanup); | |
861 | EXPORT_SYMBOL(netpoll_send_udp); | |
862 | EXPORT_SYMBOL(netpoll_poll); |