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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 | ||
068c6e98 | 52 | static void arp_reply(struct sk_buff *skb); |
1da177e4 | 53 | |
bff38771 AV |
54 | static unsigned int carrier_timeout = 4; |
55 | module_param(carrier_timeout, uint, 0644); | |
56 | ||
c4028958 | 57 | static void queue_process(struct work_struct *work) |
1da177e4 | 58 | { |
4c1ac1b4 DH |
59 | struct netpoll_info *npinfo = |
60 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 61 | struct sk_buff *skb; |
3640543d | 62 | unsigned long flags; |
1da177e4 | 63 | |
6c43ff18 SH |
64 | while ((skb = skb_dequeue(&npinfo->txq))) { |
65 | struct net_device *dev = skb->dev; | |
00829823 | 66 | const struct net_device_ops *ops = dev->netdev_ops; |
fd2ea0a7 | 67 | struct netdev_queue *txq; |
1da177e4 | 68 | |
6c43ff18 SH |
69 | if (!netif_device_present(dev) || !netif_running(dev)) { |
70 | __kfree_skb(skb); | |
71 | continue; | |
72 | } | |
1da177e4 | 73 | |
fd2ea0a7 DM |
74 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
75 | ||
3640543d | 76 | local_irq_save(flags); |
fd2ea0a7 DM |
77 | __netif_tx_lock(txq, smp_processor_id()); |
78 | if (netif_tx_queue_stopped(txq) || | |
c3f26a26 | 79 | netif_tx_queue_frozen(txq) || |
00829823 | 80 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
6c43ff18 | 81 | skb_queue_head(&npinfo->txq, skb); |
fd2ea0a7 | 82 | __netif_tx_unlock(txq); |
3640543d | 83 | local_irq_restore(flags); |
1da177e4 | 84 | |
25442caf | 85 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
86 | return; |
87 | } | |
fd2ea0a7 | 88 | __netif_tx_unlock(txq); |
3640543d | 89 | local_irq_restore(flags); |
1da177e4 | 90 | } |
1da177e4 LT |
91 | } |
92 | ||
b51655b9 AV |
93 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
94 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 95 | { |
d6f5493c | 96 | __wsum psum; |
fb286bb2 | 97 | |
60476372 | 98 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
99 | return 0; |
100 | ||
fb286bb2 HX |
101 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
102 | ||
84fa7933 | 103 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 104 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 105 | return 0; |
1da177e4 | 106 | |
fb286bb2 | 107 | skb->csum = psum; |
1da177e4 | 108 | |
fb286bb2 | 109 | return __skb_checksum_complete(skb); |
1da177e4 LT |
110 | } |
111 | ||
112 | /* | |
113 | * Check whether delayed processing was scheduled for our NIC. If so, | |
114 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
115 | * If this fails, either we've recursed in ->poll() or it's already | |
116 | * running on another CPU. | |
117 | * | |
118 | * Note: we don't mask interrupts with this lock because we're using | |
119 | * trylock here and interrupts are already disabled in the softirq | |
120 | * case. Further, we test the poll_owner to avoid recursion on UP | |
121 | * systems where the lock doesn't exist. | |
122 | * | |
123 | * In cases where there is bi-directional communications, reading only | |
124 | * one message at a time can lead to packets being dropped by the | |
125 | * network adapter, forcing superfluous retries and possibly timeouts. | |
126 | * Thus, we set our budget to greater than 1. | |
127 | */ | |
0a7606c1 DM |
128 | static int poll_one_napi(struct netpoll_info *npinfo, |
129 | struct napi_struct *napi, int budget) | |
130 | { | |
131 | int work; | |
132 | ||
133 | /* net_rx_action's ->poll() invocations and our's are | |
134 | * synchronized by this test which is only made while | |
135 | * holding the napi->poll_lock. | |
136 | */ | |
137 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
138 | return budget; | |
139 | ||
d9452e9f | 140 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
0a7606c1 | 141 | atomic_inc(&trapped); |
7b363e44 | 142 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
143 | |
144 | work = napi->poll(napi, budget); | |
7d18f114 | 145 | trace_napi_poll(napi); |
0a7606c1 | 146 | |
7b363e44 | 147 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 | 148 | atomic_dec(&trapped); |
d9452e9f | 149 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
0a7606c1 DM |
150 | |
151 | return budget - work; | |
152 | } | |
153 | ||
5106930b | 154 | static void poll_napi(struct net_device *dev) |
1da177e4 | 155 | { |
bea3348e | 156 | struct napi_struct *napi; |
1da177e4 LT |
157 | int budget = 16; |
158 | ||
5106930b | 159 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 160 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 161 | spin_trylock(&napi->poll_lock)) { |
5106930b | 162 | budget = poll_one_napi(dev->npinfo, napi, budget); |
bea3348e | 163 | spin_unlock(&napi->poll_lock); |
0a7606c1 DM |
164 | |
165 | if (!budget) | |
166 | break; | |
bea3348e | 167 | } |
1da177e4 LT |
168 | } |
169 | } | |
170 | ||
068c6e98 NH |
171 | static void service_arp_queue(struct netpoll_info *npi) |
172 | { | |
5106930b SH |
173 | if (npi) { |
174 | struct sk_buff *skb; | |
068c6e98 | 175 | |
5106930b SH |
176 | while ((skb = skb_dequeue(&npi->arp_tx))) |
177 | arp_reply(skb); | |
068c6e98 | 178 | } |
068c6e98 NH |
179 | } |
180 | ||
0e34e931 | 181 | void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 182 | { |
5e392739 | 183 | const struct net_device_ops *ops; |
5106930b | 184 | |
5e392739 PE |
185 | if (!dev || !netif_running(dev)) |
186 | return; | |
187 | ||
188 | ops = dev->netdev_ops; | |
189 | if (!ops->ndo_poll_controller) | |
1da177e4 LT |
190 | return; |
191 | ||
192 | /* Process pending work on NIC */ | |
d314774c | 193 | ops->ndo_poll_controller(dev); |
5106930b SH |
194 | |
195 | poll_napi(dev); | |
1da177e4 | 196 | |
5106930b | 197 | service_arp_queue(dev->npinfo); |
068c6e98 | 198 | |
1da177e4 LT |
199 | } |
200 | ||
0e34e931 WC |
201 | void netpoll_poll(struct netpoll *np) |
202 | { | |
203 | netpoll_poll_dev(np->dev); | |
204 | } | |
205 | ||
1da177e4 LT |
206 | static void refill_skbs(void) |
207 | { | |
208 | struct sk_buff *skb; | |
209 | unsigned long flags; | |
210 | ||
a1bcfacd SH |
211 | spin_lock_irqsave(&skb_pool.lock, flags); |
212 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
213 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
214 | if (!skb) | |
215 | break; | |
216 | ||
a1bcfacd | 217 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 218 | } |
a1bcfacd | 219 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
220 | } |
221 | ||
a1bcfacd | 222 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 223 | { |
a1bcfacd SH |
224 | int count = 0; |
225 | struct sk_buff *skb; | |
1da177e4 | 226 | |
a1bcfacd | 227 | refill_skbs(); |
1da177e4 | 228 | repeat: |
1da177e4 LT |
229 | |
230 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
231 | if (!skb) |
232 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
233 | |
234 | if (!skb) { | |
a1bcfacd SH |
235 | if (++count < 10) { |
236 | netpoll_poll(np); | |
237 | goto repeat; | |
1da177e4 | 238 | } |
a1bcfacd | 239 | return NULL; |
1da177e4 LT |
240 | } |
241 | ||
242 | atomic_set(&skb->users, 1); | |
243 | skb_reserve(skb, reserve); | |
244 | return skb; | |
245 | } | |
246 | ||
bea3348e SH |
247 | static int netpoll_owner_active(struct net_device *dev) |
248 | { | |
249 | struct napi_struct *napi; | |
250 | ||
251 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
252 | if (napi->poll_owner == smp_processor_id()) | |
253 | return 1; | |
254 | } | |
255 | return 0; | |
256 | } | |
257 | ||
0e34e931 | 258 | void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
1da177e4 | 259 | { |
2bdfe0ba SH |
260 | int status = NETDEV_TX_BUSY; |
261 | unsigned long tries; | |
4ec93edb | 262 | struct net_device *dev = np->dev; |
00829823 | 263 | const struct net_device_ops *ops = dev->netdev_ops; |
4ec93edb | 264 | struct netpoll_info *npinfo = np->dev->npinfo; |
2bdfe0ba | 265 | |
4ec93edb YH |
266 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
267 | __kfree_skb(skb); | |
268 | return; | |
269 | } | |
2bdfe0ba SH |
270 | |
271 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 272 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 273 | struct netdev_queue *txq; |
a49f99ff AM |
274 | unsigned long flags; |
275 | ||
fd2ea0a7 DM |
276 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
277 | ||
a49f99ff | 278 | local_irq_save(flags); |
0db3dc73 SH |
279 | /* try until next clock tick */ |
280 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
281 | tries > 0; --tries) { | |
fd2ea0a7 | 282 | if (__netif_tx_trylock(txq)) { |
08baf561 | 283 | if (!netif_tx_queue_stopped(txq)) { |
0e34e931 | 284 | dev->priv_flags |= IFF_IN_NETPOLL; |
00829823 | 285 | status = ops->ndo_start_xmit(skb, dev); |
0e34e931 | 286 | dev->priv_flags &= ~IFF_IN_NETPOLL; |
08baf561 ED |
287 | if (status == NETDEV_TX_OK) |
288 | txq_trans_update(txq); | |
289 | } | |
fd2ea0a7 | 290 | __netif_tx_unlock(txq); |
e37b8d93 AM |
291 | |
292 | if (status == NETDEV_TX_OK) | |
293 | break; | |
294 | ||
e37b8d93 | 295 | } |
0db3dc73 SH |
296 | |
297 | /* tickle device maybe there is some cleanup */ | |
298 | netpoll_poll(np); | |
299 | ||
300 | udelay(USEC_PER_POLL); | |
0db1d6fc | 301 | } |
79b1bee8 DD |
302 | |
303 | WARN_ONCE(!irqs_disabled(), | |
304 | "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n", | |
305 | dev->name, ops->ndo_start_xmit); | |
306 | ||
a49f99ff | 307 | local_irq_restore(flags); |
1da177e4 | 308 | } |
1da177e4 | 309 | |
2bdfe0ba | 310 | if (status != NETDEV_TX_OK) { |
5de4a473 | 311 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 312 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 313 | } |
1da177e4 LT |
314 | } |
315 | ||
316 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
317 | { | |
318 | int total_len, eth_len, ip_len, udp_len; | |
319 | struct sk_buff *skb; | |
320 | struct udphdr *udph; | |
321 | struct iphdr *iph; | |
322 | struct ethhdr *eth; | |
323 | ||
324 | udp_len = len + sizeof(*udph); | |
325 | ip_len = eth_len = udp_len + sizeof(*iph); | |
326 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
327 | ||
328 | skb = find_skb(np, total_len, total_len - len); | |
329 | if (!skb) | |
330 | return; | |
331 | ||
27d7ff46 | 332 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
333 | skb->len += len; |
334 | ||
4bedb452 ACM |
335 | skb_push(skb, sizeof(*udph)); |
336 | skb_reset_transport_header(skb); | |
337 | udph = udp_hdr(skb); | |
1da177e4 LT |
338 | udph->source = htons(np->local_port); |
339 | udph->dest = htons(np->remote_port); | |
340 | udph->len = htons(udp_len); | |
341 | udph->check = 0; | |
e7557af5 HH |
342 | udph->check = csum_tcpudp_magic(np->local_ip, |
343 | np->remote_ip, | |
8e365eec | 344 | udp_len, IPPROTO_UDP, |
07f0757a | 345 | csum_partial(udph, udp_len, 0)); |
8e365eec | 346 | if (udph->check == 0) |
5e57dff2 | 347 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 348 | |
e2d1bca7 ACM |
349 | skb_push(skb, sizeof(*iph)); |
350 | skb_reset_network_header(skb); | |
eddc9ec5 | 351 | iph = ip_hdr(skb); |
1da177e4 LT |
352 | |
353 | /* iph->version = 4; iph->ihl = 5; */ | |
354 | put_unaligned(0x45, (unsigned char *)iph); | |
355 | iph->tos = 0; | |
356 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
357 | iph->id = 0; | |
358 | iph->frag_off = 0; | |
359 | iph->ttl = 64; | |
360 | iph->protocol = IPPROTO_UDP; | |
361 | iph->check = 0; | |
e7557af5 HH |
362 | put_unaligned(np->local_ip, &(iph->saddr)); |
363 | put_unaligned(np->remote_ip, &(iph->daddr)); | |
1da177e4 LT |
364 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
365 | ||
366 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 367 | skb_reset_mac_header(skb); |
206daaf7 | 368 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
369 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
370 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
371 | |
372 | skb->dev = np->dev; | |
373 | ||
374 | netpoll_send_skb(np, skb); | |
375 | } | |
376 | ||
377 | static void arp_reply(struct sk_buff *skb) | |
378 | { | |
115c1d6e | 379 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
380 | struct arphdr *arp; |
381 | unsigned char *arp_ptr; | |
382 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 383 | __be32 sip, tip; |
47bbec02 | 384 | unsigned char *sha; |
1da177e4 | 385 | struct sk_buff *send_skb; |
508e14b4 DB |
386 | struct netpoll *np, *tmp; |
387 | unsigned long flags; | |
388 | int hits = 0; | |
389 | ||
390 | if (list_empty(&npinfo->rx_np)) | |
391 | return; | |
392 | ||
393 | /* Before checking the packet, we do some early | |
394 | inspection whether this is interesting at all */ | |
395 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
396 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
397 | if (np->dev == skb->dev) | |
398 | hits++; | |
399 | } | |
400 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 | 401 | |
508e14b4 DB |
402 | /* No netpoll struct is using this dev */ |
403 | if (!hits) | |
115c1d6e | 404 | return; |
1da177e4 LT |
405 | |
406 | /* No arp on this interface */ | |
407 | if (skb->dev->flags & IFF_NOARP) | |
408 | return; | |
409 | ||
988b7050 | 410 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
411 | return; |
412 | ||
c1d2bbe1 | 413 | skb_reset_network_header(skb); |
badff6d0 | 414 | skb_reset_transport_header(skb); |
d0a92be0 | 415 | arp = arp_hdr(skb); |
1da177e4 LT |
416 | |
417 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
418 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
419 | arp->ar_pro != htons(ETH_P_IP) || | |
420 | arp->ar_op != htons(ARPOP_REQUEST)) | |
421 | return; | |
422 | ||
47bbec02 NH |
423 | arp_ptr = (unsigned char *)(arp+1); |
424 | /* save the location of the src hw addr */ | |
425 | sha = arp_ptr; | |
426 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 427 | memcpy(&sip, arp_ptr, 4); |
47bbec02 | 428 | arp_ptr += 4; |
508e14b4 DB |
429 | /* If we actually cared about dst hw addr, |
430 | it would get copied here */ | |
47bbec02 | 431 | arp_ptr += skb->dev->addr_len; |
1da177e4 LT |
432 | memcpy(&tip, arp_ptr, 4); |
433 | ||
434 | /* Should we ignore arp? */ | |
508e14b4 | 435 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
1da177e4 LT |
436 | return; |
437 | ||
988b7050 | 438 | size = arp_hdr_len(skb->dev); |
1da177e4 | 439 | |
508e14b4 DB |
440 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
441 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
442 | if (tip != np->local_ip) | |
443 | continue; | |
1da177e4 | 444 | |
508e14b4 DB |
445 | send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev), |
446 | LL_RESERVED_SPACE(np->dev)); | |
447 | if (!send_skb) | |
448 | continue; | |
1da177e4 | 449 | |
508e14b4 DB |
450 | skb_reset_network_header(send_skb); |
451 | arp = (struct arphdr *) skb_put(send_skb, size); | |
452 | send_skb->dev = skb->dev; | |
453 | send_skb->protocol = htons(ETH_P_ARP); | |
1da177e4 | 454 | |
508e14b4 DB |
455 | /* Fill the device header for the ARP frame */ |
456 | if (dev_hard_header(send_skb, skb->dev, ptype, | |
457 | sha, np->dev->dev_addr, | |
458 | send_skb->len) < 0) { | |
459 | kfree_skb(send_skb); | |
460 | continue; | |
461 | } | |
1da177e4 | 462 | |
508e14b4 DB |
463 | /* |
464 | * Fill out the arp protocol part. | |
465 | * | |
466 | * we only support ethernet device type, | |
467 | * which (according to RFC 1390) should | |
468 | * always equal 1 (Ethernet). | |
469 | */ | |
1da177e4 | 470 | |
508e14b4 DB |
471 | arp->ar_hrd = htons(np->dev->type); |
472 | arp->ar_pro = htons(ETH_P_IP); | |
473 | arp->ar_hln = np->dev->addr_len; | |
474 | arp->ar_pln = 4; | |
475 | arp->ar_op = htons(type); | |
476 | ||
477 | arp_ptr = (unsigned char *)(arp + 1); | |
478 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
479 | arp_ptr += np->dev->addr_len; | |
480 | memcpy(arp_ptr, &tip, 4); | |
481 | arp_ptr += 4; | |
482 | memcpy(arp_ptr, sha, np->dev->addr_len); | |
483 | arp_ptr += np->dev->addr_len; | |
484 | memcpy(arp_ptr, &sip, 4); | |
485 | ||
486 | netpoll_send_skb(np, send_skb); | |
487 | ||
488 | /* If there are several rx_hooks for the same address, | |
489 | we're fine by sending a single reply */ | |
490 | break; | |
491 | } | |
492 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 LT |
493 | } |
494 | ||
495 | int __netpoll_rx(struct sk_buff *skb) | |
496 | { | |
497 | int proto, len, ulen; | |
508e14b4 | 498 | int hits = 0; |
1da177e4 LT |
499 | struct iphdr *iph; |
500 | struct udphdr *uh; | |
508e14b4 DB |
501 | struct netpoll_info *npinfo = skb->dev->npinfo; |
502 | struct netpoll *np, *tmp; | |
068c6e98 | 503 | |
508e14b4 | 504 | if (list_empty(&npinfo->rx_np)) |
1da177e4 | 505 | goto out; |
508e14b4 | 506 | |
1da177e4 LT |
507 | if (skb->dev->type != ARPHRD_ETHER) |
508 | goto out; | |
509 | ||
d9452e9f | 510 | /* check if netpoll clients need ARP */ |
724800d6 | 511 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 512 | atomic_read(&trapped)) { |
508e14b4 | 513 | skb_queue_tail(&npinfo->arp_tx, skb); |
1da177e4 LT |
514 | return 1; |
515 | } | |
516 | ||
517 | proto = ntohs(eth_hdr(skb)->h_proto); | |
518 | if (proto != ETH_P_IP) | |
519 | goto out; | |
520 | if (skb->pkt_type == PACKET_OTHERHOST) | |
521 | goto out; | |
522 | if (skb_shared(skb)) | |
523 | goto out; | |
524 | ||
525 | iph = (struct iphdr *)skb->data; | |
526 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
527 | goto out; | |
528 | if (iph->ihl < 5 || iph->version != 4) | |
529 | goto out; | |
530 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
531 | goto out; | |
532 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
533 | goto out; | |
534 | ||
535 | len = ntohs(iph->tot_len); | |
536 | if (skb->len < len || len < iph->ihl*4) | |
537 | goto out; | |
538 | ||
5e7d7fa5 AL |
539 | /* |
540 | * Our transport medium may have padded the buffer out. | |
541 | * Now We trim to the true length of the frame. | |
542 | */ | |
543 | if (pskb_trim_rcsum(skb, len)) | |
544 | goto out; | |
545 | ||
1da177e4 LT |
546 | if (iph->protocol != IPPROTO_UDP) |
547 | goto out; | |
548 | ||
549 | len -= iph->ihl*4; | |
550 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
551 | ulen = ntohs(uh->len); | |
552 | ||
553 | if (ulen != len) | |
554 | goto out; | |
fb286bb2 | 555 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 | 556 | goto out; |
1da177e4 | 557 | |
508e14b4 DB |
558 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
559 | if (np->local_ip && np->local_ip != iph->daddr) | |
560 | continue; | |
561 | if (np->remote_ip && np->remote_ip != iph->saddr) | |
562 | continue; | |
563 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
564 | continue; | |
565 | ||
566 | np->rx_hook(np, ntohs(uh->source), | |
567 | (char *)(uh+1), | |
568 | ulen - sizeof(struct udphdr)); | |
569 | hits++; | |
570 | } | |
571 | ||
572 | if (!hits) | |
573 | goto out; | |
1da177e4 LT |
574 | |
575 | kfree_skb(skb); | |
576 | return 1; | |
577 | ||
578 | out: | |
579 | if (atomic_read(&trapped)) { | |
580 | kfree_skb(skb); | |
581 | return 1; | |
582 | } | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
0bcc1816 SS |
587 | void netpoll_print_options(struct netpoll *np) |
588 | { | |
589 | printk(KERN_INFO "%s: local port %d\n", | |
590 | np->name, np->local_port); | |
e7557af5 HH |
591 | printk(KERN_INFO "%s: local IP %pI4\n", |
592 | np->name, &np->local_ip); | |
5fc05f87 | 593 | printk(KERN_INFO "%s: interface '%s'\n", |
0bcc1816 SS |
594 | np->name, np->dev_name); |
595 | printk(KERN_INFO "%s: remote port %d\n", | |
596 | np->name, np->remote_port); | |
e7557af5 HH |
597 | printk(KERN_INFO "%s: remote IP %pI4\n", |
598 | np->name, &np->remote_ip); | |
e174961c JB |
599 | printk(KERN_INFO "%s: remote ethernet address %pM\n", |
600 | np->name, np->remote_mac); | |
0bcc1816 SS |
601 | } |
602 | ||
1da177e4 LT |
603 | int netpoll_parse_options(struct netpoll *np, char *opt) |
604 | { | |
605 | char *cur=opt, *delim; | |
606 | ||
c68b9070 | 607 | if (*cur != '@') { |
1da177e4 LT |
608 | if ((delim = strchr(cur, '@')) == NULL) |
609 | goto parse_failed; | |
c68b9070 DM |
610 | *delim = 0; |
611 | np->local_port = simple_strtol(cur, NULL, 10); | |
612 | cur = delim; | |
1da177e4 LT |
613 | } |
614 | cur++; | |
1da177e4 | 615 | |
c68b9070 | 616 | if (*cur != '/') { |
1da177e4 LT |
617 | if ((delim = strchr(cur, '/')) == NULL) |
618 | goto parse_failed; | |
c68b9070 | 619 | *delim = 0; |
e7557af5 | 620 | np->local_ip = in_aton(cur); |
c68b9070 | 621 | cur = delim; |
1da177e4 LT |
622 | } |
623 | cur++; | |
624 | ||
c68b9070 | 625 | if (*cur != ',') { |
1da177e4 LT |
626 | /* parse out dev name */ |
627 | if ((delim = strchr(cur, ',')) == NULL) | |
628 | goto parse_failed; | |
c68b9070 | 629 | *delim = 0; |
1da177e4 | 630 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 631 | cur = delim; |
1da177e4 LT |
632 | } |
633 | cur++; | |
634 | ||
c68b9070 | 635 | if (*cur != '@') { |
1da177e4 LT |
636 | /* dst port */ |
637 | if ((delim = strchr(cur, '@')) == NULL) | |
638 | goto parse_failed; | |
c68b9070 | 639 | *delim = 0; |
5fc05f87 AW |
640 | if (*cur == ' ' || *cur == '\t') |
641 | printk(KERN_INFO "%s: warning: whitespace" | |
642 | "is not allowed\n", np->name); | |
c68b9070 DM |
643 | np->remote_port = simple_strtol(cur, NULL, 10); |
644 | cur = delim; | |
1da177e4 LT |
645 | } |
646 | cur++; | |
1da177e4 LT |
647 | |
648 | /* dst ip */ | |
649 | if ((delim = strchr(cur, '/')) == NULL) | |
650 | goto parse_failed; | |
c68b9070 | 651 | *delim = 0; |
e7557af5 | 652 | np->remote_ip = in_aton(cur); |
c68b9070 | 653 | cur = delim + 1; |
1da177e4 | 654 | |
c68b9070 | 655 | if (*cur != 0) { |
1da177e4 LT |
656 | /* MAC address */ |
657 | if ((delim = strchr(cur, ':')) == NULL) | |
658 | goto parse_failed; | |
c68b9070 DM |
659 | *delim = 0; |
660 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
661 | cur = delim + 1; | |
1da177e4 LT |
662 | if ((delim = strchr(cur, ':')) == NULL) |
663 | goto parse_failed; | |
c68b9070 DM |
664 | *delim = 0; |
665 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
666 | cur = delim + 1; | |
1da177e4 LT |
667 | if ((delim = strchr(cur, ':')) == NULL) |
668 | goto parse_failed; | |
c68b9070 DM |
669 | *delim = 0; |
670 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
671 | cur = delim + 1; | |
1da177e4 LT |
672 | if ((delim = strchr(cur, ':')) == NULL) |
673 | goto parse_failed; | |
c68b9070 DM |
674 | *delim = 0; |
675 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
676 | cur = delim + 1; | |
1da177e4 LT |
677 | if ((delim = strchr(cur, ':')) == NULL) |
678 | goto parse_failed; | |
c68b9070 DM |
679 | *delim = 0; |
680 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
681 | cur = delim + 1; | |
682 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
683 | } |
684 | ||
0bcc1816 | 685 | netpoll_print_options(np); |
1da177e4 LT |
686 | |
687 | return 0; | |
688 | ||
689 | parse_failed: | |
5fc05f87 | 690 | printk(KERN_INFO "%s: couldn't parse config at '%s'!\n", |
1da177e4 LT |
691 | np->name, cur); |
692 | return -1; | |
693 | } | |
694 | ||
695 | int netpoll_setup(struct netpoll *np) | |
696 | { | |
697 | struct net_device *ndev = NULL; | |
698 | struct in_device *in_dev; | |
115c1d6e | 699 | struct netpoll_info *npinfo; |
508e14b4 | 700 | struct netpoll *npe, *tmp; |
fbeec2e1 | 701 | unsigned long flags; |
b41848b6 | 702 | int err; |
1da177e4 LT |
703 | |
704 | if (np->dev_name) | |
881d966b | 705 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 LT |
706 | if (!ndev) { |
707 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
708 | np->name, np->dev_name); | |
b41848b6 | 709 | return -ENODEV; |
1da177e4 LT |
710 | } |
711 | ||
712 | np->dev = ndev; | |
115c1d6e JM |
713 | if (!ndev->npinfo) { |
714 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
715 | if (!npinfo) { |
716 | err = -ENOMEM; | |
21edbb22 | 717 | goto put; |
b41848b6 | 718 | } |
115c1d6e | 719 | |
d9452e9f | 720 | npinfo->rx_flags = 0; |
508e14b4 | 721 | INIT_LIST_HEAD(&npinfo->rx_np); |
2bdfe0ba | 722 | |
a9f6a0dd | 723 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 724 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 725 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 726 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 727 | |
93ec2c72 SH |
728 | atomic_set(&npinfo->refcnt, 1); |
729 | } else { | |
115c1d6e | 730 | npinfo = ndev->npinfo; |
93ec2c72 SH |
731 | atomic_inc(&npinfo->refcnt); |
732 | } | |
1da177e4 | 733 | |
0e34e931 WC |
734 | npinfo->netpoll = np; |
735 | ||
736 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || | |
737 | !ndev->netdev_ops->ndo_poll_controller) { | |
1da177e4 LT |
738 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", |
739 | np->name, np->dev_name); | |
b41848b6 | 740 | err = -ENOTSUPP; |
1da177e4 LT |
741 | goto release; |
742 | } | |
743 | ||
744 | if (!netif_running(ndev)) { | |
745 | unsigned long atmost, atleast; | |
746 | ||
747 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
748 | np->name, np->dev_name); | |
749 | ||
6756ae4b | 750 | rtnl_lock(); |
b41848b6 SH |
751 | err = dev_open(ndev); |
752 | rtnl_unlock(); | |
753 | ||
754 | if (err) { | |
1da177e4 | 755 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 756 | np->name, ndev->name); |
1da177e4 LT |
757 | goto release; |
758 | } | |
1da177e4 LT |
759 | |
760 | atleast = jiffies + HZ/10; | |
bff38771 | 761 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
762 | while (!netif_carrier_ok(ndev)) { |
763 | if (time_after(jiffies, atmost)) { | |
764 | printk(KERN_NOTICE | |
765 | "%s: timeout waiting for carrier\n", | |
766 | np->name); | |
767 | break; | |
768 | } | |
1b614fb9 | 769 | msleep(1); |
1da177e4 LT |
770 | } |
771 | ||
772 | /* If carrier appears to come up instantly, we don't | |
773 | * trust it and pause so that we don't pump all our | |
774 | * queued console messages into the bitbucket. | |
775 | */ | |
776 | ||
777 | if (time_before(jiffies, atleast)) { | |
778 | printk(KERN_NOTICE "%s: carrier detect appears" | |
779 | " untrustworthy, waiting 4 seconds\n", | |
780 | np->name); | |
781 | msleep(4000); | |
782 | } | |
783 | } | |
784 | ||
1da177e4 LT |
785 | if (!np->local_ip) { |
786 | rcu_read_lock(); | |
e5ed6399 | 787 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
788 | |
789 | if (!in_dev || !in_dev->ifa_list) { | |
790 | rcu_read_unlock(); | |
791 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
792 | np->name, np->dev_name); | |
b41848b6 | 793 | err = -EDESTADDRREQ; |
1da177e4 LT |
794 | goto release; |
795 | } | |
796 | ||
e7557af5 | 797 | np->local_ip = in_dev->ifa_list->ifa_local; |
1da177e4 | 798 | rcu_read_unlock(); |
e7557af5 | 799 | printk(KERN_INFO "%s: local IP %pI4\n", np->name, &np->local_ip); |
1da177e4 LT |
800 | } |
801 | ||
fbeec2e1 JM |
802 | if (np->rx_hook) { |
803 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
d9452e9f | 804 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
508e14b4 | 805 | list_add_tail(&np->rx, &npinfo->rx_np); |
fbeec2e1 JM |
806 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
807 | } | |
26520765 IM |
808 | |
809 | /* fill up the skb queue */ | |
810 | refill_skbs(); | |
811 | ||
fbeec2e1 | 812 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 813 | ndev->npinfo = npinfo; |
1da177e4 | 814 | |
53fb95d3 MM |
815 | /* avoid racing with NAPI reading npinfo */ |
816 | synchronize_rcu(); | |
817 | ||
1da177e4 LT |
818 | return 0; |
819 | ||
820 | release: | |
508e14b4 DB |
821 | if (!ndev->npinfo) { |
822 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
823 | list_for_each_entry_safe(npe, tmp, &npinfo->rx_np, rx) { | |
824 | npe->dev = NULL; | |
825 | } | |
826 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
827 | ||
115c1d6e | 828 | kfree(npinfo); |
508e14b4 | 829 | } |
21edbb22 | 830 | put: |
1da177e4 | 831 | dev_put(ndev); |
b41848b6 | 832 | return err; |
1da177e4 LT |
833 | } |
834 | ||
c68b9070 DM |
835 | static int __init netpoll_init(void) |
836 | { | |
a1bcfacd SH |
837 | skb_queue_head_init(&skb_pool); |
838 | return 0; | |
839 | } | |
840 | core_initcall(netpoll_init); | |
841 | ||
1da177e4 LT |
842 | void netpoll_cleanup(struct netpoll *np) |
843 | { | |
fbeec2e1 JM |
844 | struct netpoll_info *npinfo; |
845 | unsigned long flags; | |
846 | ||
115c1d6e | 847 | if (np->dev) { |
fbeec2e1 | 848 | npinfo = np->dev->npinfo; |
93ec2c72 | 849 | if (npinfo) { |
508e14b4 | 850 | if (!list_empty(&npinfo->rx_np)) { |
93ec2c72 | 851 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
508e14b4 DB |
852 | list_del(&np->rx); |
853 | if (list_empty(&npinfo->rx_np)) | |
854 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
93ec2c72 SH |
855 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
856 | } | |
857 | ||
93ec2c72 | 858 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
0e34e931 | 859 | const struct net_device_ops *ops; |
93ec2c72 | 860 | skb_queue_purge(&npinfo->arp_tx); |
4ec93edb | 861 | skb_queue_purge(&npinfo->txq); |
25442caf | 862 | cancel_rearming_delayed_work(&npinfo->tx_work); |
93ec2c72 | 863 | |
17200811 | 864 | /* clean after last, unfinished work */ |
0adc9add | 865 | __skb_queue_purge(&npinfo->txq); |
93ec2c72 | 866 | kfree(npinfo); |
0e34e931 WC |
867 | ops = np->dev->netdev_ops; |
868 | if (ops->ndo_netpoll_cleanup) | |
869 | ops->ndo_netpoll_cleanup(np->dev); | |
c04ec806 | 870 | np->dev->npinfo = NULL; |
93ec2c72 | 871 | } |
fbeec2e1 | 872 | } |
93ec2c72 | 873 | |
115c1d6e JM |
874 | dev_put(np->dev); |
875 | } | |
fbeec2e1 | 876 | |
1da177e4 LT |
877 | np->dev = NULL; |
878 | } | |
879 | ||
880 | int netpoll_trap(void) | |
881 | { | |
882 | return atomic_read(&trapped); | |
883 | } | |
884 | ||
885 | void netpoll_set_trap(int trap) | |
886 | { | |
887 | if (trap) | |
888 | atomic_inc(&trapped); | |
889 | else | |
890 | atomic_dec(&trapped); | |
891 | } | |
892 | ||
0e34e931 | 893 | EXPORT_SYMBOL(netpoll_send_skb); |
1da177e4 LT |
894 | EXPORT_SYMBOL(netpoll_set_trap); |
895 | EXPORT_SYMBOL(netpoll_trap); | |
0bcc1816 | 896 | EXPORT_SYMBOL(netpoll_print_options); |
1da177e4 LT |
897 | EXPORT_SYMBOL(netpoll_parse_options); |
898 | EXPORT_SYMBOL(netpoll_setup); | |
899 | EXPORT_SYMBOL(netpoll_cleanup); | |
900 | EXPORT_SYMBOL(netpoll_send_udp); | |
0e34e931 | 901 | EXPORT_SYMBOL(netpoll_poll_dev); |
1da177e4 | 902 | EXPORT_SYMBOL(netpoll_poll); |