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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 | 199 | } |
9e34a5b5 | 200 | EXPORT_SYMBOL(netpoll_poll_dev); |
1da177e4 | 201 | |
0e34e931 WC |
202 | void netpoll_poll(struct netpoll *np) |
203 | { | |
204 | netpoll_poll_dev(np->dev); | |
205 | } | |
9e34a5b5 | 206 | EXPORT_SYMBOL(netpoll_poll); |
0e34e931 | 207 | |
1da177e4 LT |
208 | static void refill_skbs(void) |
209 | { | |
210 | struct sk_buff *skb; | |
211 | unsigned long flags; | |
212 | ||
a1bcfacd SH |
213 | spin_lock_irqsave(&skb_pool.lock, flags); |
214 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
215 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
216 | if (!skb) | |
217 | break; | |
218 | ||
a1bcfacd | 219 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 220 | } |
a1bcfacd | 221 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
222 | } |
223 | ||
a1bcfacd | 224 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 225 | { |
a1bcfacd SH |
226 | int count = 0; |
227 | struct sk_buff *skb; | |
1da177e4 | 228 | |
a1bcfacd | 229 | refill_skbs(); |
1da177e4 | 230 | repeat: |
1da177e4 LT |
231 | |
232 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
233 | if (!skb) |
234 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
235 | |
236 | if (!skb) { | |
a1bcfacd SH |
237 | if (++count < 10) { |
238 | netpoll_poll(np); | |
239 | goto repeat; | |
1da177e4 | 240 | } |
a1bcfacd | 241 | return NULL; |
1da177e4 LT |
242 | } |
243 | ||
244 | atomic_set(&skb->users, 1); | |
245 | skb_reserve(skb, reserve); | |
246 | return skb; | |
247 | } | |
248 | ||
bea3348e SH |
249 | static int netpoll_owner_active(struct net_device *dev) |
250 | { | |
251 | struct napi_struct *napi; | |
252 | ||
253 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
254 | if (napi->poll_owner == smp_processor_id()) | |
255 | return 1; | |
256 | } | |
257 | return 0; | |
258 | } | |
259 | ||
0e34e931 | 260 | void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
1da177e4 | 261 | { |
2bdfe0ba SH |
262 | int status = NETDEV_TX_BUSY; |
263 | unsigned long tries; | |
4ec93edb | 264 | struct net_device *dev = np->dev; |
00829823 | 265 | const struct net_device_ops *ops = dev->netdev_ops; |
de85d99e | 266 | /* It is up to the caller to keep npinfo alive. */ |
4ec93edb | 267 | struct netpoll_info *npinfo = np->dev->npinfo; |
2bdfe0ba | 268 | |
4ec93edb YH |
269 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
270 | __kfree_skb(skb); | |
271 | return; | |
272 | } | |
2bdfe0ba SH |
273 | |
274 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 275 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 276 | struct netdev_queue *txq; |
a49f99ff AM |
277 | unsigned long flags; |
278 | ||
fd2ea0a7 DM |
279 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
280 | ||
a49f99ff | 281 | local_irq_save(flags); |
0db3dc73 SH |
282 | /* try until next clock tick */ |
283 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
284 | tries > 0; --tries) { | |
fd2ea0a7 | 285 | if (__netif_tx_trylock(txq)) { |
08baf561 | 286 | if (!netif_tx_queue_stopped(txq)) { |
0e34e931 | 287 | dev->priv_flags |= IFF_IN_NETPOLL; |
00829823 | 288 | status = ops->ndo_start_xmit(skb, dev); |
0e34e931 | 289 | dev->priv_flags &= ~IFF_IN_NETPOLL; |
08baf561 ED |
290 | if (status == NETDEV_TX_OK) |
291 | txq_trans_update(txq); | |
292 | } | |
fd2ea0a7 | 293 | __netif_tx_unlock(txq); |
e37b8d93 AM |
294 | |
295 | if (status == NETDEV_TX_OK) | |
296 | break; | |
297 | ||
e37b8d93 | 298 | } |
0db3dc73 SH |
299 | |
300 | /* tickle device maybe there is some cleanup */ | |
301 | netpoll_poll(np); | |
302 | ||
303 | udelay(USEC_PER_POLL); | |
0db1d6fc | 304 | } |
79b1bee8 DD |
305 | |
306 | WARN_ONCE(!irqs_disabled(), | |
307 | "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n", | |
308 | dev->name, ops->ndo_start_xmit); | |
309 | ||
a49f99ff | 310 | local_irq_restore(flags); |
1da177e4 | 311 | } |
1da177e4 | 312 | |
2bdfe0ba | 313 | if (status != NETDEV_TX_OK) { |
5de4a473 | 314 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 315 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 316 | } |
1da177e4 | 317 | } |
9e34a5b5 | 318 | EXPORT_SYMBOL(netpoll_send_skb); |
1da177e4 LT |
319 | |
320 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
321 | { | |
322 | int total_len, eth_len, ip_len, udp_len; | |
323 | struct sk_buff *skb; | |
324 | struct udphdr *udph; | |
325 | struct iphdr *iph; | |
326 | struct ethhdr *eth; | |
327 | ||
328 | udp_len = len + sizeof(*udph); | |
329 | ip_len = eth_len = udp_len + sizeof(*iph); | |
330 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
331 | ||
332 | skb = find_skb(np, total_len, total_len - len); | |
333 | if (!skb) | |
334 | return; | |
335 | ||
27d7ff46 | 336 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
337 | skb->len += len; |
338 | ||
4bedb452 ACM |
339 | skb_push(skb, sizeof(*udph)); |
340 | skb_reset_transport_header(skb); | |
341 | udph = udp_hdr(skb); | |
1da177e4 LT |
342 | udph->source = htons(np->local_port); |
343 | udph->dest = htons(np->remote_port); | |
344 | udph->len = htons(udp_len); | |
345 | udph->check = 0; | |
e7557af5 HH |
346 | udph->check = csum_tcpudp_magic(np->local_ip, |
347 | np->remote_ip, | |
8e365eec | 348 | udp_len, IPPROTO_UDP, |
07f0757a | 349 | csum_partial(udph, udp_len, 0)); |
8e365eec | 350 | if (udph->check == 0) |
5e57dff2 | 351 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 352 | |
e2d1bca7 ACM |
353 | skb_push(skb, sizeof(*iph)); |
354 | skb_reset_network_header(skb); | |
eddc9ec5 | 355 | iph = ip_hdr(skb); |
1da177e4 LT |
356 | |
357 | /* iph->version = 4; iph->ihl = 5; */ | |
358 | put_unaligned(0x45, (unsigned char *)iph); | |
359 | iph->tos = 0; | |
360 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
361 | iph->id = 0; | |
362 | iph->frag_off = 0; | |
363 | iph->ttl = 64; | |
364 | iph->protocol = IPPROTO_UDP; | |
365 | iph->check = 0; | |
e7557af5 HH |
366 | put_unaligned(np->local_ip, &(iph->saddr)); |
367 | put_unaligned(np->remote_ip, &(iph->daddr)); | |
1da177e4 LT |
368 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
369 | ||
370 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 371 | skb_reset_mac_header(skb); |
206daaf7 | 372 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
373 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
374 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
375 | |
376 | skb->dev = np->dev; | |
377 | ||
378 | netpoll_send_skb(np, skb); | |
379 | } | |
9e34a5b5 | 380 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 LT |
381 | |
382 | static void arp_reply(struct sk_buff *skb) | |
383 | { | |
115c1d6e | 384 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
385 | struct arphdr *arp; |
386 | unsigned char *arp_ptr; | |
387 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 388 | __be32 sip, tip; |
47bbec02 | 389 | unsigned char *sha; |
1da177e4 | 390 | struct sk_buff *send_skb; |
508e14b4 DB |
391 | struct netpoll *np, *tmp; |
392 | unsigned long flags; | |
393 | int hits = 0; | |
394 | ||
395 | if (list_empty(&npinfo->rx_np)) | |
396 | return; | |
397 | ||
398 | /* Before checking the packet, we do some early | |
399 | inspection whether this is interesting at all */ | |
400 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
401 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
402 | if (np->dev == skb->dev) | |
403 | hits++; | |
404 | } | |
405 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 | 406 | |
508e14b4 DB |
407 | /* No netpoll struct is using this dev */ |
408 | if (!hits) | |
115c1d6e | 409 | return; |
1da177e4 LT |
410 | |
411 | /* No arp on this interface */ | |
412 | if (skb->dev->flags & IFF_NOARP) | |
413 | return; | |
414 | ||
988b7050 | 415 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
416 | return; |
417 | ||
c1d2bbe1 | 418 | skb_reset_network_header(skb); |
badff6d0 | 419 | skb_reset_transport_header(skb); |
d0a92be0 | 420 | arp = arp_hdr(skb); |
1da177e4 LT |
421 | |
422 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
423 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
424 | arp->ar_pro != htons(ETH_P_IP) || | |
425 | arp->ar_op != htons(ARPOP_REQUEST)) | |
426 | return; | |
427 | ||
47bbec02 NH |
428 | arp_ptr = (unsigned char *)(arp+1); |
429 | /* save the location of the src hw addr */ | |
430 | sha = arp_ptr; | |
431 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 432 | memcpy(&sip, arp_ptr, 4); |
47bbec02 | 433 | arp_ptr += 4; |
508e14b4 DB |
434 | /* If we actually cared about dst hw addr, |
435 | it would get copied here */ | |
47bbec02 | 436 | arp_ptr += skb->dev->addr_len; |
1da177e4 LT |
437 | memcpy(&tip, arp_ptr, 4); |
438 | ||
439 | /* Should we ignore arp? */ | |
508e14b4 | 440 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
1da177e4 LT |
441 | return; |
442 | ||
988b7050 | 443 | size = arp_hdr_len(skb->dev); |
1da177e4 | 444 | |
508e14b4 DB |
445 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
446 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
447 | if (tip != np->local_ip) | |
448 | continue; | |
1da177e4 | 449 | |
508e14b4 DB |
450 | send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev), |
451 | LL_RESERVED_SPACE(np->dev)); | |
452 | if (!send_skb) | |
453 | continue; | |
1da177e4 | 454 | |
508e14b4 DB |
455 | skb_reset_network_header(send_skb); |
456 | arp = (struct arphdr *) skb_put(send_skb, size); | |
457 | send_skb->dev = skb->dev; | |
458 | send_skb->protocol = htons(ETH_P_ARP); | |
1da177e4 | 459 | |
508e14b4 DB |
460 | /* Fill the device header for the ARP frame */ |
461 | if (dev_hard_header(send_skb, skb->dev, ptype, | |
462 | sha, np->dev->dev_addr, | |
463 | send_skb->len) < 0) { | |
464 | kfree_skb(send_skb); | |
465 | continue; | |
466 | } | |
1da177e4 | 467 | |
508e14b4 DB |
468 | /* |
469 | * Fill out the arp protocol part. | |
470 | * | |
471 | * we only support ethernet device type, | |
472 | * which (according to RFC 1390) should | |
473 | * always equal 1 (Ethernet). | |
474 | */ | |
1da177e4 | 475 | |
508e14b4 DB |
476 | arp->ar_hrd = htons(np->dev->type); |
477 | arp->ar_pro = htons(ETH_P_IP); | |
478 | arp->ar_hln = np->dev->addr_len; | |
479 | arp->ar_pln = 4; | |
480 | arp->ar_op = htons(type); | |
481 | ||
482 | arp_ptr = (unsigned char *)(arp + 1); | |
483 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
484 | arp_ptr += np->dev->addr_len; | |
485 | memcpy(arp_ptr, &tip, 4); | |
486 | arp_ptr += 4; | |
487 | memcpy(arp_ptr, sha, np->dev->addr_len); | |
488 | arp_ptr += np->dev->addr_len; | |
489 | memcpy(arp_ptr, &sip, 4); | |
490 | ||
491 | netpoll_send_skb(np, send_skb); | |
492 | ||
493 | /* If there are several rx_hooks for the same address, | |
494 | we're fine by sending a single reply */ | |
495 | break; | |
496 | } | |
497 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 LT |
498 | } |
499 | ||
500 | int __netpoll_rx(struct sk_buff *skb) | |
501 | { | |
502 | int proto, len, ulen; | |
508e14b4 | 503 | int hits = 0; |
1da177e4 LT |
504 | struct iphdr *iph; |
505 | struct udphdr *uh; | |
508e14b4 DB |
506 | struct netpoll_info *npinfo = skb->dev->npinfo; |
507 | struct netpoll *np, *tmp; | |
068c6e98 | 508 | |
508e14b4 | 509 | if (list_empty(&npinfo->rx_np)) |
1da177e4 | 510 | goto out; |
508e14b4 | 511 | |
1da177e4 LT |
512 | if (skb->dev->type != ARPHRD_ETHER) |
513 | goto out; | |
514 | ||
d9452e9f | 515 | /* check if netpoll clients need ARP */ |
724800d6 | 516 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 517 | atomic_read(&trapped)) { |
508e14b4 | 518 | skb_queue_tail(&npinfo->arp_tx, skb); |
1da177e4 LT |
519 | return 1; |
520 | } | |
521 | ||
522 | proto = ntohs(eth_hdr(skb)->h_proto); | |
523 | if (proto != ETH_P_IP) | |
524 | goto out; | |
525 | if (skb->pkt_type == PACKET_OTHERHOST) | |
526 | goto out; | |
527 | if (skb_shared(skb)) | |
528 | goto out; | |
529 | ||
530 | iph = (struct iphdr *)skb->data; | |
531 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
532 | goto out; | |
533 | if (iph->ihl < 5 || iph->version != 4) | |
534 | goto out; | |
535 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
536 | goto out; | |
537 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
538 | goto out; | |
539 | ||
540 | len = ntohs(iph->tot_len); | |
541 | if (skb->len < len || len < iph->ihl*4) | |
542 | goto out; | |
543 | ||
5e7d7fa5 AL |
544 | /* |
545 | * Our transport medium may have padded the buffer out. | |
546 | * Now We trim to the true length of the frame. | |
547 | */ | |
548 | if (pskb_trim_rcsum(skb, len)) | |
549 | goto out; | |
550 | ||
1da177e4 LT |
551 | if (iph->protocol != IPPROTO_UDP) |
552 | goto out; | |
553 | ||
554 | len -= iph->ihl*4; | |
555 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
556 | ulen = ntohs(uh->len); | |
557 | ||
558 | if (ulen != len) | |
559 | goto out; | |
fb286bb2 | 560 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 | 561 | goto out; |
1da177e4 | 562 | |
508e14b4 DB |
563 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
564 | if (np->local_ip && np->local_ip != iph->daddr) | |
565 | continue; | |
566 | if (np->remote_ip && np->remote_ip != iph->saddr) | |
567 | continue; | |
568 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
569 | continue; | |
570 | ||
571 | np->rx_hook(np, ntohs(uh->source), | |
572 | (char *)(uh+1), | |
573 | ulen - sizeof(struct udphdr)); | |
574 | hits++; | |
575 | } | |
576 | ||
577 | if (!hits) | |
578 | goto out; | |
1da177e4 LT |
579 | |
580 | kfree_skb(skb); | |
581 | return 1; | |
582 | ||
583 | out: | |
584 | if (atomic_read(&trapped)) { | |
585 | kfree_skb(skb); | |
586 | return 1; | |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
0bcc1816 SS |
592 | void netpoll_print_options(struct netpoll *np) |
593 | { | |
594 | printk(KERN_INFO "%s: local port %d\n", | |
595 | np->name, np->local_port); | |
e7557af5 HH |
596 | printk(KERN_INFO "%s: local IP %pI4\n", |
597 | np->name, &np->local_ip); | |
5fc05f87 | 598 | printk(KERN_INFO "%s: interface '%s'\n", |
0bcc1816 SS |
599 | np->name, np->dev_name); |
600 | printk(KERN_INFO "%s: remote port %d\n", | |
601 | np->name, np->remote_port); | |
e7557af5 HH |
602 | printk(KERN_INFO "%s: remote IP %pI4\n", |
603 | np->name, &np->remote_ip); | |
e174961c JB |
604 | printk(KERN_INFO "%s: remote ethernet address %pM\n", |
605 | np->name, np->remote_mac); | |
0bcc1816 | 606 | } |
9e34a5b5 | 607 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 608 | |
1da177e4 LT |
609 | int netpoll_parse_options(struct netpoll *np, char *opt) |
610 | { | |
611 | char *cur=opt, *delim; | |
612 | ||
c68b9070 | 613 | if (*cur != '@') { |
1da177e4 LT |
614 | if ((delim = strchr(cur, '@')) == NULL) |
615 | goto parse_failed; | |
c68b9070 DM |
616 | *delim = 0; |
617 | np->local_port = simple_strtol(cur, NULL, 10); | |
618 | cur = delim; | |
1da177e4 LT |
619 | } |
620 | cur++; | |
1da177e4 | 621 | |
c68b9070 | 622 | if (*cur != '/') { |
1da177e4 LT |
623 | if ((delim = strchr(cur, '/')) == NULL) |
624 | goto parse_failed; | |
c68b9070 | 625 | *delim = 0; |
e7557af5 | 626 | np->local_ip = in_aton(cur); |
c68b9070 | 627 | cur = delim; |
1da177e4 LT |
628 | } |
629 | cur++; | |
630 | ||
c68b9070 | 631 | if (*cur != ',') { |
1da177e4 LT |
632 | /* parse out dev name */ |
633 | if ((delim = strchr(cur, ',')) == NULL) | |
634 | goto parse_failed; | |
c68b9070 | 635 | *delim = 0; |
1da177e4 | 636 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 637 | cur = delim; |
1da177e4 LT |
638 | } |
639 | cur++; | |
640 | ||
c68b9070 | 641 | if (*cur != '@') { |
1da177e4 LT |
642 | /* dst port */ |
643 | if ((delim = strchr(cur, '@')) == NULL) | |
644 | goto parse_failed; | |
c68b9070 | 645 | *delim = 0; |
5fc05f87 AW |
646 | if (*cur == ' ' || *cur == '\t') |
647 | printk(KERN_INFO "%s: warning: whitespace" | |
648 | "is not allowed\n", np->name); | |
c68b9070 DM |
649 | np->remote_port = simple_strtol(cur, NULL, 10); |
650 | cur = delim; | |
1da177e4 LT |
651 | } |
652 | cur++; | |
1da177e4 LT |
653 | |
654 | /* dst ip */ | |
655 | if ((delim = strchr(cur, '/')) == NULL) | |
656 | goto parse_failed; | |
c68b9070 | 657 | *delim = 0; |
e7557af5 | 658 | np->remote_ip = in_aton(cur); |
c68b9070 | 659 | cur = delim + 1; |
1da177e4 | 660 | |
c68b9070 | 661 | if (*cur != 0) { |
1da177e4 LT |
662 | /* MAC address */ |
663 | if ((delim = strchr(cur, ':')) == NULL) | |
664 | goto parse_failed; | |
c68b9070 DM |
665 | *delim = 0; |
666 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
667 | cur = delim + 1; | |
1da177e4 LT |
668 | if ((delim = strchr(cur, ':')) == NULL) |
669 | goto parse_failed; | |
c68b9070 DM |
670 | *delim = 0; |
671 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
672 | cur = delim + 1; | |
1da177e4 LT |
673 | if ((delim = strchr(cur, ':')) == NULL) |
674 | goto parse_failed; | |
c68b9070 DM |
675 | *delim = 0; |
676 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
677 | cur = delim + 1; | |
1da177e4 LT |
678 | if ((delim = strchr(cur, ':')) == NULL) |
679 | goto parse_failed; | |
c68b9070 DM |
680 | *delim = 0; |
681 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
682 | cur = delim + 1; | |
1da177e4 LT |
683 | if ((delim = strchr(cur, ':')) == NULL) |
684 | goto parse_failed; | |
c68b9070 DM |
685 | *delim = 0; |
686 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
687 | cur = delim + 1; | |
688 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
689 | } |
690 | ||
0bcc1816 | 691 | netpoll_print_options(np); |
1da177e4 LT |
692 | |
693 | return 0; | |
694 | ||
695 | parse_failed: | |
5fc05f87 | 696 | printk(KERN_INFO "%s: couldn't parse config at '%s'!\n", |
1da177e4 LT |
697 | np->name, cur); |
698 | return -1; | |
699 | } | |
9e34a5b5 | 700 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 701 | |
8fdd95ec | 702 | int __netpoll_setup(struct netpoll *np) |
1da177e4 | 703 | { |
8fdd95ec | 704 | struct net_device *ndev = np->dev; |
115c1d6e | 705 | struct netpoll_info *npinfo; |
4247e161 | 706 | const struct net_device_ops *ops; |
fbeec2e1 | 707 | unsigned long flags; |
b41848b6 | 708 | int err; |
1da177e4 | 709 | |
8fdd95ec HX |
710 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || |
711 | !ndev->netdev_ops->ndo_poll_controller) { | |
712 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
713 | np->name, np->dev_name); | |
714 | err = -ENOTSUPP; | |
715 | goto out; | |
716 | } | |
717 | ||
718 | if (!ndev->npinfo) { | |
719 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
720 | if (!npinfo) { | |
721 | err = -ENOMEM; | |
722 | goto out; | |
723 | } | |
724 | ||
725 | npinfo->rx_flags = 0; | |
726 | INIT_LIST_HEAD(&npinfo->rx_np); | |
727 | ||
728 | spin_lock_init(&npinfo->rx_lock); | |
729 | skb_queue_head_init(&npinfo->arp_tx); | |
730 | skb_queue_head_init(&npinfo->txq); | |
731 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
732 | ||
733 | atomic_set(&npinfo->refcnt, 1); | |
734 | ||
735 | ops = np->dev->netdev_ops; | |
736 | if (ops->ndo_netpoll_setup) { | |
737 | err = ops->ndo_netpoll_setup(ndev, npinfo); | |
738 | if (err) | |
739 | goto free_npinfo; | |
740 | } | |
741 | } else { | |
742 | npinfo = ndev->npinfo; | |
743 | atomic_inc(&npinfo->refcnt); | |
744 | } | |
745 | ||
746 | npinfo->netpoll = np; | |
747 | ||
748 | if (np->rx_hook) { | |
749 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
750 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
751 | list_add_tail(&np->rx, &npinfo->rx_np); | |
752 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
753 | } | |
754 | ||
755 | /* last thing to do is link it to the net device structure */ | |
756 | rcu_assign_pointer(ndev->npinfo, npinfo); | |
8fdd95ec HX |
757 | |
758 | return 0; | |
759 | ||
760 | free_npinfo: | |
761 | kfree(npinfo); | |
762 | out: | |
763 | return err; | |
764 | } | |
765 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
766 | ||
767 | int netpoll_setup(struct netpoll *np) | |
768 | { | |
769 | struct net_device *ndev = NULL; | |
770 | struct in_device *in_dev; | |
771 | int err; | |
772 | ||
1da177e4 | 773 | if (np->dev_name) |
881d966b | 774 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 LT |
775 | if (!ndev) { |
776 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
777 | np->name, np->dev_name); | |
b41848b6 | 778 | return -ENODEV; |
1da177e4 LT |
779 | } |
780 | ||
1da177e4 LT |
781 | if (!netif_running(ndev)) { |
782 | unsigned long atmost, atleast; | |
783 | ||
784 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
785 | np->name, np->dev_name); | |
786 | ||
6756ae4b | 787 | rtnl_lock(); |
b41848b6 SH |
788 | err = dev_open(ndev); |
789 | rtnl_unlock(); | |
790 | ||
791 | if (err) { | |
1da177e4 | 792 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 793 | np->name, ndev->name); |
dbaa1541 | 794 | goto put; |
1da177e4 | 795 | } |
1da177e4 LT |
796 | |
797 | atleast = jiffies + HZ/10; | |
bff38771 | 798 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
799 | while (!netif_carrier_ok(ndev)) { |
800 | if (time_after(jiffies, atmost)) { | |
801 | printk(KERN_NOTICE | |
802 | "%s: timeout waiting for carrier\n", | |
803 | np->name); | |
804 | break; | |
805 | } | |
1b614fb9 | 806 | msleep(1); |
1da177e4 LT |
807 | } |
808 | ||
809 | /* If carrier appears to come up instantly, we don't | |
810 | * trust it and pause so that we don't pump all our | |
811 | * queued console messages into the bitbucket. | |
812 | */ | |
813 | ||
814 | if (time_before(jiffies, atleast)) { | |
815 | printk(KERN_NOTICE "%s: carrier detect appears" | |
816 | " untrustworthy, waiting 4 seconds\n", | |
817 | np->name); | |
818 | msleep(4000); | |
819 | } | |
820 | } | |
821 | ||
1da177e4 LT |
822 | if (!np->local_ip) { |
823 | rcu_read_lock(); | |
e5ed6399 | 824 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
825 | |
826 | if (!in_dev || !in_dev->ifa_list) { | |
827 | rcu_read_unlock(); | |
828 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
829 | np->name, np->dev_name); | |
b41848b6 | 830 | err = -EDESTADDRREQ; |
dbaa1541 | 831 | goto put; |
1da177e4 LT |
832 | } |
833 | ||
e7557af5 | 834 | np->local_ip = in_dev->ifa_list->ifa_local; |
1da177e4 | 835 | rcu_read_unlock(); |
e7557af5 | 836 | printk(KERN_INFO "%s: local IP %pI4\n", np->name, &np->local_ip); |
1da177e4 LT |
837 | } |
838 | ||
dbaa1541 HX |
839 | np->dev = ndev; |
840 | ||
841 | /* fill up the skb queue */ | |
842 | refill_skbs(); | |
843 | ||
844 | rtnl_lock(); | |
8fdd95ec | 845 | err = __netpoll_setup(np); |
dbaa1541 | 846 | rtnl_unlock(); |
53fb95d3 | 847 | |
8fdd95ec HX |
848 | if (err) |
849 | goto put; | |
850 | ||
1da177e4 LT |
851 | return 0; |
852 | ||
21edbb22 | 853 | put: |
1da177e4 | 854 | dev_put(ndev); |
b41848b6 | 855 | return err; |
1da177e4 | 856 | } |
9e34a5b5 | 857 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 858 | |
c68b9070 DM |
859 | static int __init netpoll_init(void) |
860 | { | |
a1bcfacd SH |
861 | skb_queue_head_init(&skb_pool); |
862 | return 0; | |
863 | } | |
864 | core_initcall(netpoll_init); | |
865 | ||
8fdd95ec | 866 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 867 | { |
fbeec2e1 JM |
868 | struct netpoll_info *npinfo; |
869 | unsigned long flags; | |
870 | ||
8fdd95ec HX |
871 | npinfo = np->dev->npinfo; |
872 | if (!npinfo) | |
dbaa1541 | 873 | return; |
93ec2c72 | 874 | |
8fdd95ec HX |
875 | if (!list_empty(&npinfo->rx_np)) { |
876 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
877 | list_del(&np->rx); | |
878 | if (list_empty(&npinfo->rx_np)) | |
879 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
880 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
881 | } | |
de85d99e | 882 | |
8fdd95ec HX |
883 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
884 | const struct net_device_ops *ops; | |
de85d99e | 885 | |
8fdd95ec HX |
886 | ops = np->dev->netdev_ops; |
887 | if (ops->ndo_netpoll_cleanup) | |
888 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 889 | |
8fdd95ec | 890 | rcu_assign_pointer(np->dev->npinfo, NULL); |
de85d99e | 891 | |
dbaa1541 HX |
892 | /* avoid racing with NAPI reading npinfo */ |
893 | synchronize_rcu_bh(); | |
93ec2c72 | 894 | |
dbaa1541 HX |
895 | skb_queue_purge(&npinfo->arp_tx); |
896 | skb_queue_purge(&npinfo->txq); | |
897 | cancel_rearming_delayed_work(&npinfo->tx_work); | |
93ec2c72 | 898 | |
dbaa1541 HX |
899 | /* clean after last, unfinished work */ |
900 | __skb_queue_purge(&npinfo->txq); | |
901 | kfree(npinfo); | |
115c1d6e | 902 | } |
8fdd95ec HX |
903 | } |
904 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
fbeec2e1 | 905 | |
8fdd95ec HX |
906 | void netpoll_cleanup(struct netpoll *np) |
907 | { | |
908 | if (!np->dev) | |
909 | return; | |
dbaa1541 | 910 | |
8fdd95ec HX |
911 | rtnl_lock(); |
912 | __netpoll_cleanup(np); | |
913 | rtnl_unlock(); | |
914 | ||
915 | dev_put(np->dev); | |
1da177e4 LT |
916 | np->dev = NULL; |
917 | } | |
9e34a5b5 | 918 | EXPORT_SYMBOL(netpoll_cleanup); |
1da177e4 LT |
919 | |
920 | int netpoll_trap(void) | |
921 | { | |
922 | return atomic_read(&trapped); | |
923 | } | |
9e34a5b5 | 924 | EXPORT_SYMBOL(netpoll_trap); |
1da177e4 LT |
925 | |
926 | void netpoll_set_trap(int trap) | |
927 | { | |
928 | if (trap) | |
929 | atomic_inc(&trapped); | |
930 | else | |
931 | atomic_dec(&trapped); | |
932 | } | |
1da177e4 | 933 | EXPORT_SYMBOL(netpoll_set_trap); |