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