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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 | ||
e6ec2693 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
bff38771 | 14 | #include <linux/moduleparam.h> |
4cd5773a | 15 | #include <linux/kernel.h> |
1da177e4 LT |
16 | #include <linux/netdevice.h> |
17 | #include <linux/etherdevice.h> | |
18 | #include <linux/string.h> | |
14c85021 | 19 | #include <linux/if_arp.h> |
1da177e4 LT |
20 | #include <linux/inetdevice.h> |
21 | #include <linux/inet.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/netpoll.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/rcupdate.h> | |
27 | #include <linux/workqueue.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
bc3b2d7f | 29 | #include <linux/export.h> |
689971b4 | 30 | #include <linux/if_vlan.h> |
1da177e4 LT |
31 | #include <net/tcp.h> |
32 | #include <net/udp.h> | |
b3d936f3 CW |
33 | #include <net/addrconf.h> |
34 | #include <net/ndisc.h> | |
35 | #include <net/ip6_checksum.h> | |
1da177e4 | 36 | #include <asm/unaligned.h> |
9cbc1cb8 | 37 | #include <trace/events/napi.h> |
1da177e4 LT |
38 | |
39 | /* | |
40 | * We maintain a small pool of fully-sized skbs, to make sure the | |
41 | * message gets out even in extreme OOM situations. | |
42 | */ | |
43 | ||
44 | #define MAX_UDP_CHUNK 1460 | |
45 | #define MAX_SKBS 32 | |
1da177e4 | 46 | |
a1bcfacd | 47 | static struct sk_buff_head skb_pool; |
1da177e4 | 48 | |
7f9421c2 | 49 | DEFINE_STATIC_SRCU(netpoll_srcu); |
ca99ca14 | 50 | |
2bdfe0ba | 51 | #define USEC_PER_POLL 50 |
1da177e4 | 52 | |
6f706245 JP |
53 | #define MAX_SKB_SIZE \ |
54 | (sizeof(struct ethhdr) + \ | |
55 | sizeof(struct iphdr) + \ | |
56 | sizeof(struct udphdr) + \ | |
57 | MAX_UDP_CHUNK) | |
1da177e4 | 58 | |
3578b0c8 | 59 | static void zap_completion_queue(void); |
1da177e4 | 60 | |
bff38771 AV |
61 | static unsigned int carrier_timeout = 4; |
62 | module_param(carrier_timeout, uint, 0644); | |
63 | ||
e6ec2693 JP |
64 | #define np_info(np, fmt, ...) \ |
65 | pr_info("%s: " fmt, np->name, ##__VA_ARGS__) | |
66 | #define np_err(np, fmt, ...) \ | |
67 | pr_err("%s: " fmt, np->name, ##__VA_ARGS__) | |
68 | #define np_notice(np, fmt, ...) \ | |
69 | pr_notice("%s: " fmt, np->name, ##__VA_ARGS__) | |
70 | ||
944e2948 EB |
71 | static int netpoll_start_xmit(struct sk_buff *skb, struct net_device *dev, |
72 | struct netdev_queue *txq) | |
73 | { | |
944e2948 EB |
74 | int status = NETDEV_TX_OK; |
75 | netdev_features_t features; | |
76 | ||
77 | features = netif_skb_features(skb); | |
78 | ||
df8a39de | 79 | if (skb_vlan_tag_present(skb) && |
944e2948 | 80 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { |
5968250c | 81 | skb = __vlan_hwaccel_push_inside(skb); |
944e2948 EB |
82 | if (unlikely(!skb)) { |
83 | /* This is actually a packet drop, but we | |
84 | * don't want the code that calls this | |
85 | * function to try and operate on a NULL skb. | |
86 | */ | |
87 | goto out; | |
88 | } | |
944e2948 EB |
89 | } |
90 | ||
fa2dbdc2 | 91 | status = netdev_start_xmit(skb, dev, txq, false); |
944e2948 EB |
92 | |
93 | out: | |
94 | return status; | |
95 | } | |
96 | ||
c4028958 | 97 | static void queue_process(struct work_struct *work) |
1da177e4 | 98 | { |
4c1ac1b4 DH |
99 | struct netpoll_info *npinfo = |
100 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 101 | struct sk_buff *skb; |
3640543d | 102 | unsigned long flags; |
1da177e4 | 103 | |
6c43ff18 SH |
104 | while ((skb = skb_dequeue(&npinfo->txq))) { |
105 | struct net_device *dev = skb->dev; | |
fd2ea0a7 | 106 | struct netdev_queue *txq; |
c70b17b7 | 107 | unsigned int q_index; |
1da177e4 | 108 | |
6c43ff18 | 109 | if (!netif_device_present(dev) || !netif_running(dev)) { |
080b3c19 | 110 | kfree_skb(skb); |
6c43ff18 SH |
111 | continue; |
112 | } | |
1da177e4 | 113 | |
3640543d | 114 | local_irq_save(flags); |
c70b17b7 TD |
115 | /* check if skb->queue_mapping is still valid */ |
116 | q_index = skb_get_queue_mapping(skb); | |
117 | if (unlikely(q_index >= dev->real_num_tx_queues)) { | |
118 | q_index = q_index % dev->real_num_tx_queues; | |
119 | skb_set_queue_mapping(skb, q_index); | |
120 | } | |
121 | txq = netdev_get_tx_queue(dev, q_index); | |
5efeac44 | 122 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
73466498 | 123 | if (netif_xmit_frozen_or_stopped(txq) || |
944e2948 | 124 | netpoll_start_xmit(skb, dev, txq) != NETDEV_TX_OK) { |
6c43ff18 | 125 | skb_queue_head(&npinfo->txq, skb); |
5efeac44 | 126 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 127 | local_irq_restore(flags); |
1da177e4 | 128 | |
25442caf | 129 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
130 | return; |
131 | } | |
5efeac44 | 132 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 133 | local_irq_restore(flags); |
1da177e4 | 134 | } |
1da177e4 LT |
135 | } |
136 | ||
822d54b9 | 137 | static void poll_one_napi(struct napi_struct *napi) |
0a7606c1 | 138 | { |
c24498c6 | 139 | int work; |
0a7606c1 | 140 | |
2d8bff12 NH |
141 | /* If we set this bit but see that it has already been set, |
142 | * that indicates that napi has been disabled and we need | |
143 | * to abort this operation | |
144 | */ | |
145 | if (test_and_set_bit(NAPI_STATE_NPSVC, &napi->state)) | |
822d54b9 | 146 | return; |
0a7606c1 | 147 | |
822d54b9 AD |
148 | /* We explicilty pass the polling call a budget of 0 to |
149 | * indicate that we are clearing the Tx path only. | |
150 | */ | |
151 | work = napi->poll(napi, 0); | |
152 | WARN_ONCE(work, "%pF exceeded budget in poll\n", napi->poll); | |
1db19db7 | 153 | trace_napi_poll(napi, work, 0); |
0a7606c1 | 154 | |
7b363e44 | 155 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
156 | } |
157 | ||
822d54b9 | 158 | static void poll_napi(struct net_device *dev) |
1da177e4 | 159 | { |
bea3348e | 160 | struct napi_struct *napi; |
89c4b442 | 161 | int cpu = smp_processor_id(); |
1da177e4 | 162 | |
f13d493d | 163 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
89c4b442 | 164 | if (cmpxchg(&napi->poll_owner, -1, cpu) == -1) { |
822d54b9 | 165 | poll_one_napi(napi); |
89c4b442 | 166 | smp_store_release(&napi->poll_owner, -1); |
bea3348e | 167 | } |
1da177e4 LT |
168 | } |
169 | } | |
170 | ||
ac3d9dd0 | 171 | void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 172 | { |
2899656b | 173 | struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo); |
ac3d9dd0 | 174 | const struct net_device_ops *ops; |
5106930b | 175 | |
ca99ca14 NH |
176 | /* Don't do any rx activity if the dev_lock mutex is held |
177 | * the dev_open/close paths use this to block netpoll activity | |
178 | * while changing device state | |
179 | */ | |
ac3d9dd0 | 180 | if (!ni || down_trylock(&ni->dev_lock)) |
ca99ca14 NH |
181 | return; |
182 | ||
959d5fde | 183 | if (!netif_running(dev)) { |
bd7c4b60 | 184 | up(&ni->dev_lock); |
5e392739 | 185 | return; |
959d5fde | 186 | } |
5e392739 PE |
187 | |
188 | ops = dev->netdev_ops; | |
ac3d9dd0 ED |
189 | if (ops->ndo_poll_controller) |
190 | ops->ndo_poll_controller(dev); | |
5106930b | 191 | |
822d54b9 | 192 | poll_napi(dev); |
1da177e4 | 193 | |
bd7c4b60 | 194 | up(&ni->dev_lock); |
ca99ca14 | 195 | |
3578b0c8 | 196 | zap_completion_queue(); |
1da177e4 | 197 | } |
ac3d9dd0 | 198 | EXPORT_SYMBOL(netpoll_poll_dev); |
1da177e4 | 199 | |
66b5552f | 200 | void netpoll_poll_disable(struct net_device *dev) |
ca99ca14 NH |
201 | { |
202 | struct netpoll_info *ni; | |
203 | int idx; | |
204 | might_sleep(); | |
205 | idx = srcu_read_lock(&netpoll_srcu); | |
206 | ni = srcu_dereference(dev->npinfo, &netpoll_srcu); | |
207 | if (ni) | |
bd7c4b60 | 208 | down(&ni->dev_lock); |
ca99ca14 | 209 | srcu_read_unlock(&netpoll_srcu, idx); |
ca99ca14 | 210 | } |
66b5552f | 211 | EXPORT_SYMBOL(netpoll_poll_disable); |
ca99ca14 | 212 | |
66b5552f | 213 | void netpoll_poll_enable(struct net_device *dev) |
ca99ca14 NH |
214 | { |
215 | struct netpoll_info *ni; | |
216 | rcu_read_lock(); | |
217 | ni = rcu_dereference(dev->npinfo); | |
218 | if (ni) | |
bd7c4b60 | 219 | up(&ni->dev_lock); |
ca99ca14 NH |
220 | rcu_read_unlock(); |
221 | } | |
66b5552f | 222 | EXPORT_SYMBOL(netpoll_poll_enable); |
ca99ca14 | 223 | |
1da177e4 LT |
224 | static void refill_skbs(void) |
225 | { | |
226 | struct sk_buff *skb; | |
227 | unsigned long flags; | |
228 | ||
a1bcfacd SH |
229 | spin_lock_irqsave(&skb_pool.lock, flags); |
230 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
231 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
232 | if (!skb) | |
233 | break; | |
234 | ||
a1bcfacd | 235 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 236 | } |
a1bcfacd | 237 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
238 | } |
239 | ||
3578b0c8 DM |
240 | static void zap_completion_queue(void) |
241 | { | |
242 | unsigned long flags; | |
243 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
244 | ||
245 | if (sd->completion_queue) { | |
246 | struct sk_buff *clist; | |
247 | ||
248 | local_irq_save(flags); | |
249 | clist = sd->completion_queue; | |
250 | sd->completion_queue = NULL; | |
251 | local_irq_restore(flags); | |
252 | ||
253 | while (clist != NULL) { | |
254 | struct sk_buff *skb = clist; | |
255 | clist = clist->next; | |
b1586f09 | 256 | if (!skb_irq_freeable(skb)) { |
230cd127 | 257 | refcount_set(&skb->users, 1); |
3578b0c8 DM |
258 | dev_kfree_skb_any(skb); /* put this one back */ |
259 | } else { | |
260 | __kfree_skb(skb); | |
261 | } | |
262 | } | |
263 | } | |
264 | ||
265 | put_cpu_var(softnet_data); | |
266 | } | |
267 | ||
a1bcfacd | 268 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 269 | { |
a1bcfacd SH |
270 | int count = 0; |
271 | struct sk_buff *skb; | |
1da177e4 | 272 | |
3578b0c8 | 273 | zap_completion_queue(); |
a1bcfacd | 274 | refill_skbs(); |
1da177e4 | 275 | repeat: |
1da177e4 LT |
276 | |
277 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
278 | if (!skb) |
279 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
280 | |
281 | if (!skb) { | |
a1bcfacd | 282 | if (++count < 10) { |
2a49e001 | 283 | netpoll_poll_dev(np->dev); |
a1bcfacd | 284 | goto repeat; |
1da177e4 | 285 | } |
a1bcfacd | 286 | return NULL; |
1da177e4 LT |
287 | } |
288 | ||
63354797 | 289 | refcount_set(&skb->users, 1); |
1da177e4 LT |
290 | skb_reserve(skb, reserve); |
291 | return skb; | |
292 | } | |
293 | ||
bea3348e SH |
294 | static int netpoll_owner_active(struct net_device *dev) |
295 | { | |
296 | struct napi_struct *napi; | |
297 | ||
298 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
299 | if (napi->poll_owner == smp_processor_id()) | |
300 | return 1; | |
301 | } | |
302 | return 0; | |
303 | } | |
304 | ||
2899656b | 305 | /* call with IRQ disabled */ |
c2355e1a NH |
306 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
307 | struct net_device *dev) | |
1da177e4 | 308 | { |
2bdfe0ba SH |
309 | int status = NETDEV_TX_BUSY; |
310 | unsigned long tries; | |
de85d99e | 311 | /* It is up to the caller to keep npinfo alive. */ |
2899656b | 312 | struct netpoll_info *npinfo; |
2bdfe0ba | 313 | |
af073393 | 314 | lockdep_assert_irqs_disabled(); |
2899656b AW |
315 | |
316 | npinfo = rcu_dereference_bh(np->dev->npinfo); | |
4ec93edb | 317 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
080b3c19 | 318 | dev_kfree_skb_irq(skb); |
4ec93edb YH |
319 | return; |
320 | } | |
2bdfe0ba SH |
321 | |
322 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 323 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 324 | struct netdev_queue *txq; |
a49f99ff | 325 | |
f663dd9a | 326 | txq = netdev_pick_tx(dev, skb, NULL); |
fd2ea0a7 | 327 | |
0db3dc73 SH |
328 | /* try until next clock tick */ |
329 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
330 | tries > 0; --tries) { | |
5efeac44 | 331 | if (HARD_TX_TRYLOCK(dev, txq)) { |
944e2948 EB |
332 | if (!netif_xmit_stopped(txq)) |
333 | status = netpoll_start_xmit(skb, dev, txq); | |
334 | ||
5efeac44 | 335 | HARD_TX_UNLOCK(dev, txq); |
e37b8d93 AM |
336 | |
337 | if (status == NETDEV_TX_OK) | |
338 | break; | |
339 | ||
e37b8d93 | 340 | } |
0db3dc73 SH |
341 | |
342 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 343 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
344 | |
345 | udelay(USEC_PER_POLL); | |
0db1d6fc | 346 | } |
79b1bee8 DD |
347 | |
348 | WARN_ONCE(!irqs_disabled(), | |
2899656b | 349 | "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n", |
944e2948 | 350 | dev->name, dev->netdev_ops->ndo_start_xmit); |
79b1bee8 | 351 | |
1da177e4 | 352 | } |
1da177e4 | 353 | |
2bdfe0ba | 354 | if (status != NETDEV_TX_OK) { |
5de4a473 | 355 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 356 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 357 | } |
1da177e4 | 358 | } |
c2355e1a | 359 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
1da177e4 LT |
360 | |
361 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
362 | { | |
954fba02 | 363 | int total_len, ip_len, udp_len; |
1da177e4 LT |
364 | struct sk_buff *skb; |
365 | struct udphdr *udph; | |
366 | struct iphdr *iph; | |
367 | struct ethhdr *eth; | |
ee130409 | 368 | static atomic_t ip_ident; |
b3d936f3 | 369 | struct ipv6hdr *ip6h; |
1da177e4 | 370 | |
c9fd56b3 NA |
371 | WARN_ON_ONCE(!irqs_disabled()); |
372 | ||
1da177e4 | 373 | udp_len = len + sizeof(*udph); |
b3d936f3 CW |
374 | if (np->ipv6) |
375 | ip_len = udp_len + sizeof(*ip6h); | |
376 | else | |
b7394d24 CW |
377 | ip_len = udp_len + sizeof(*iph); |
378 | ||
954fba02 | 379 | total_len = ip_len + LL_RESERVED_SPACE(np->dev); |
1da177e4 | 380 | |
954fba02 ED |
381 | skb = find_skb(np, total_len + np->dev->needed_tailroom, |
382 | total_len - len); | |
1da177e4 LT |
383 | if (!skb) |
384 | return; | |
385 | ||
27d7ff46 | 386 | skb_copy_to_linear_data(skb, msg, len); |
954fba02 | 387 | skb_put(skb, len); |
1da177e4 | 388 | |
4bedb452 ACM |
389 | skb_push(skb, sizeof(*udph)); |
390 | skb_reset_transport_header(skb); | |
391 | udph = udp_hdr(skb); | |
1da177e4 LT |
392 | udph->source = htons(np->local_port); |
393 | udph->dest = htons(np->remote_port); | |
394 | udph->len = htons(udp_len); | |
b7394d24 | 395 | |
b3d936f3 CW |
396 | if (np->ipv6) { |
397 | udph->check = 0; | |
398 | udph->check = csum_ipv6_magic(&np->local_ip.in6, | |
399 | &np->remote_ip.in6, | |
400 | udp_len, IPPROTO_UDP, | |
401 | csum_partial(udph, udp_len, 0)); | |
402 | if (udph->check == 0) | |
403 | udph->check = CSUM_MANGLED_0; | |
404 | ||
405 | skb_push(skb, sizeof(*ip6h)); | |
406 | skb_reset_network_header(skb); | |
407 | ip6h = ipv6_hdr(skb); | |
408 | ||
409 | /* ip6h->version = 6; ip6h->priority = 0; */ | |
410 | put_unaligned(0x60, (unsigned char *)ip6h); | |
411 | ip6h->flow_lbl[0] = 0; | |
412 | ip6h->flow_lbl[1] = 0; | |
413 | ip6h->flow_lbl[2] = 0; | |
414 | ||
415 | ip6h->payload_len = htons(sizeof(struct udphdr) + len); | |
416 | ip6h->nexthdr = IPPROTO_UDP; | |
417 | ip6h->hop_limit = 32; | |
418 | ip6h->saddr = np->local_ip.in6; | |
419 | ip6h->daddr = np->remote_ip.in6; | |
420 | ||
d58ff351 | 421 | eth = skb_push(skb, ETH_HLEN); |
b3d936f3 CW |
422 | skb_reset_mac_header(skb); |
423 | skb->protocol = eth->h_proto = htons(ETH_P_IPV6); | |
424 | } else { | |
b7394d24 CW |
425 | udph->check = 0; |
426 | udph->check = csum_tcpudp_magic(np->local_ip.ip, | |
427 | np->remote_ip.ip, | |
428 | udp_len, IPPROTO_UDP, | |
429 | csum_partial(udph, udp_len, 0)); | |
430 | if (udph->check == 0) | |
431 | udph->check = CSUM_MANGLED_0; | |
432 | ||
433 | skb_push(skb, sizeof(*iph)); | |
434 | skb_reset_network_header(skb); | |
435 | iph = ip_hdr(skb); | |
436 | ||
437 | /* iph->version = 4; iph->ihl = 5; */ | |
438 | put_unaligned(0x45, (unsigned char *)iph); | |
439 | iph->tos = 0; | |
440 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
441 | iph->id = htons(atomic_inc_return(&ip_ident)); | |
442 | iph->frag_off = 0; | |
443 | iph->ttl = 64; | |
444 | iph->protocol = IPPROTO_UDP; | |
445 | iph->check = 0; | |
446 | put_unaligned(np->local_ip.ip, &(iph->saddr)); | |
447 | put_unaligned(np->remote_ip.ip, &(iph->daddr)); | |
448 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
449 | ||
d58ff351 | 450 | eth = skb_push(skb, ETH_HLEN); |
b7394d24 CW |
451 | skb_reset_mac_header(skb); |
452 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
453 | } | |
454 | ||
c62326ab JP |
455 | ether_addr_copy(eth->h_source, np->dev->dev_addr); |
456 | ether_addr_copy(eth->h_dest, np->remote_mac); | |
1da177e4 LT |
457 | |
458 | skb->dev = np->dev; | |
459 | ||
460 | netpoll_send_skb(np, skb); | |
461 | } | |
9e34a5b5 | 462 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 | 463 | |
0bcc1816 SS |
464 | void netpoll_print_options(struct netpoll *np) |
465 | { | |
e6ec2693 | 466 | np_info(np, "local port %d\n", np->local_port); |
b3d936f3 CW |
467 | if (np->ipv6) |
468 | np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6); | |
469 | else | |
b7394d24 | 470 | np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip); |
e6ec2693 JP |
471 | np_info(np, "interface '%s'\n", np->dev_name); |
472 | np_info(np, "remote port %d\n", np->remote_port); | |
b3d936f3 CW |
473 | if (np->ipv6) |
474 | np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6); | |
475 | else | |
b7394d24 | 476 | np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip); |
e6ec2693 | 477 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); |
0bcc1816 | 478 | } |
9e34a5b5 | 479 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 480 | |
b7394d24 CW |
481 | static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr) |
482 | { | |
483 | const char *end; | |
484 | ||
485 | if (!strchr(str, ':') && | |
486 | in4_pton(str, -1, (void *)addr, -1, &end) > 0) { | |
487 | if (!*end) | |
488 | return 0; | |
489 | } | |
490 | if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) { | |
491 | #if IS_ENABLED(CONFIG_IPV6) | |
492 | if (!*end) | |
493 | return 1; | |
494 | #else | |
495 | return -1; | |
496 | #endif | |
497 | } | |
498 | return -1; | |
499 | } | |
500 | ||
1da177e4 LT |
501 | int netpoll_parse_options(struct netpoll *np, char *opt) |
502 | { | |
503 | char *cur=opt, *delim; | |
b7394d24 | 504 | int ipv6; |
00fe11b3 | 505 | bool ipversion_set = false; |
1da177e4 | 506 | |
c68b9070 | 507 | if (*cur != '@') { |
1da177e4 LT |
508 | if ((delim = strchr(cur, '@')) == NULL) |
509 | goto parse_failed; | |
c68b9070 | 510 | *delim = 0; |
4b5511eb AP |
511 | if (kstrtou16(cur, 10, &np->local_port)) |
512 | goto parse_failed; | |
c68b9070 | 513 | cur = delim; |
1da177e4 LT |
514 | } |
515 | cur++; | |
1da177e4 | 516 | |
c68b9070 | 517 | if (*cur != '/') { |
00fe11b3 | 518 | ipversion_set = true; |
1da177e4 LT |
519 | if ((delim = strchr(cur, '/')) == NULL) |
520 | goto parse_failed; | |
c68b9070 | 521 | *delim = 0; |
b7394d24 CW |
522 | ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip); |
523 | if (ipv6 < 0) | |
524 | goto parse_failed; | |
525 | else | |
526 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 527 | cur = delim; |
1da177e4 LT |
528 | } |
529 | cur++; | |
530 | ||
c68b9070 | 531 | if (*cur != ',') { |
1da177e4 LT |
532 | /* parse out dev name */ |
533 | if ((delim = strchr(cur, ',')) == NULL) | |
534 | goto parse_failed; | |
c68b9070 | 535 | *delim = 0; |
1da177e4 | 536 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 537 | cur = delim; |
1da177e4 LT |
538 | } |
539 | cur++; | |
540 | ||
c68b9070 | 541 | if (*cur != '@') { |
1da177e4 LT |
542 | /* dst port */ |
543 | if ((delim = strchr(cur, '@')) == NULL) | |
544 | goto parse_failed; | |
c68b9070 | 545 | *delim = 0; |
5fc05f87 | 546 | if (*cur == ' ' || *cur == '\t') |
e6ec2693 | 547 | np_info(np, "warning: whitespace is not allowed\n"); |
4b5511eb AP |
548 | if (kstrtou16(cur, 10, &np->remote_port)) |
549 | goto parse_failed; | |
c68b9070 | 550 | cur = delim; |
1da177e4 LT |
551 | } |
552 | cur++; | |
1da177e4 LT |
553 | |
554 | /* dst ip */ | |
555 | if ((delim = strchr(cur, '/')) == NULL) | |
556 | goto parse_failed; | |
c68b9070 | 557 | *delim = 0; |
b7394d24 CW |
558 | ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip); |
559 | if (ipv6 < 0) | |
560 | goto parse_failed; | |
00fe11b3 | 561 | else if (ipversion_set && np->ipv6 != (bool)ipv6) |
b7394d24 CW |
562 | goto parse_failed; |
563 | else | |
564 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 565 | cur = delim + 1; |
1da177e4 | 566 | |
c68b9070 | 567 | if (*cur != 0) { |
1da177e4 | 568 | /* MAC address */ |
4940fc88 | 569 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 570 | goto parse_failed; |
1da177e4 LT |
571 | } |
572 | ||
0bcc1816 | 573 | netpoll_print_options(np); |
1da177e4 LT |
574 | |
575 | return 0; | |
576 | ||
577 | parse_failed: | |
e6ec2693 | 578 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
1da177e4 LT |
579 | return -1; |
580 | } | |
9e34a5b5 | 581 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 582 | |
a8779ec1 | 583 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev) |
1da177e4 | 584 | { |
115c1d6e | 585 | struct netpoll_info *npinfo; |
4247e161 | 586 | const struct net_device_ops *ops; |
b41848b6 | 587 | int err; |
1da177e4 | 588 | |
727ceaa4 | 589 | np->dev = ndev; |
30fdd8a0 JP |
590 | strlcpy(np->dev_name, ndev->name, IFNAMSIZ); |
591 | ||
ac3d9dd0 | 592 | if (ndev->priv_flags & IFF_DISABLE_NETPOLL) { |
e6ec2693 JP |
593 | np_err(np, "%s doesn't support polling, aborting\n", |
594 | np->dev_name); | |
8fdd95ec HX |
595 | err = -ENOTSUPP; |
596 | goto out; | |
597 | } | |
598 | ||
599 | if (!ndev->npinfo) { | |
a8779ec1 | 600 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
8fdd95ec HX |
601 | if (!npinfo) { |
602 | err = -ENOMEM; | |
603 | goto out; | |
604 | } | |
605 | ||
bd7c4b60 | 606 | sema_init(&npinfo->dev_lock, 1); |
8fdd95ec HX |
607 | skb_queue_head_init(&npinfo->txq); |
608 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
609 | ||
433cea4d | 610 | refcount_set(&npinfo->refcnt, 1); |
8fdd95ec HX |
611 | |
612 | ops = np->dev->netdev_ops; | |
613 | if (ops->ndo_netpoll_setup) { | |
a8779ec1 | 614 | err = ops->ndo_netpoll_setup(ndev, npinfo); |
8fdd95ec HX |
615 | if (err) |
616 | goto free_npinfo; | |
617 | } | |
618 | } else { | |
0790bbb6 | 619 | npinfo = rtnl_dereference(ndev->npinfo); |
433cea4d | 620 | refcount_inc(&npinfo->refcnt); |
8fdd95ec HX |
621 | } |
622 | ||
623 | npinfo->netpoll = np; | |
624 | ||
8fdd95ec | 625 | /* last thing to do is link it to the net device structure */ |
cf778b00 | 626 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
627 | |
628 | return 0; | |
629 | ||
630 | free_npinfo: | |
631 | kfree(npinfo); | |
632 | out: | |
633 | return err; | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
636 | ||
637 | int netpoll_setup(struct netpoll *np) | |
638 | { | |
639 | struct net_device *ndev = NULL; | |
640 | struct in_device *in_dev; | |
641 | int err; | |
642 | ||
f92d3180 | 643 | rtnl_lock(); |
0c3a8f8b | 644 | if (np->dev_name[0]) { |
556e6256 CW |
645 | struct net *net = current->nsproxy->net_ns; |
646 | ndev = __dev_get_by_name(net, np->dev_name); | |
647 | } | |
1da177e4 | 648 | if (!ndev) { |
e6ec2693 | 649 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
f92d3180 CW |
650 | err = -ENODEV; |
651 | goto unlock; | |
1da177e4 | 652 | } |
5bd30d39 | 653 | dev_hold(ndev); |
1da177e4 | 654 | |
49bd8fb0 | 655 | if (netdev_master_upper_dev_get(ndev)) { |
e6ec2693 | 656 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
83fe32de DC |
657 | err = -EBUSY; |
658 | goto put; | |
0c1ad04a WC |
659 | } |
660 | ||
1da177e4 LT |
661 | if (!netif_running(ndev)) { |
662 | unsigned long atmost, atleast; | |
663 | ||
e6ec2693 | 664 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
1da177e4 | 665 | |
00f54e68 | 666 | err = dev_open(ndev, NULL); |
b41848b6 SH |
667 | |
668 | if (err) { | |
e6ec2693 | 669 | np_err(np, "failed to open %s\n", ndev->name); |
dbaa1541 | 670 | goto put; |
1da177e4 | 671 | } |
1da177e4 | 672 | |
f92d3180 | 673 | rtnl_unlock(); |
1da177e4 | 674 | atleast = jiffies + HZ/10; |
bff38771 | 675 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
676 | while (!netif_carrier_ok(ndev)) { |
677 | if (time_after(jiffies, atmost)) { | |
e6ec2693 | 678 | np_notice(np, "timeout waiting for carrier\n"); |
1da177e4 LT |
679 | break; |
680 | } | |
1b614fb9 | 681 | msleep(1); |
1da177e4 LT |
682 | } |
683 | ||
684 | /* If carrier appears to come up instantly, we don't | |
685 | * trust it and pause so that we don't pump all our | |
686 | * queued console messages into the bitbucket. | |
687 | */ | |
688 | ||
689 | if (time_before(jiffies, atleast)) { | |
e6ec2693 | 690 | np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n"); |
1da177e4 LT |
691 | msleep(4000); |
692 | } | |
f92d3180 | 693 | rtnl_lock(); |
1da177e4 LT |
694 | } |
695 | ||
b7394d24 CW |
696 | if (!np->local_ip.ip) { |
697 | if (!np->ipv6) { | |
f92d3180 | 698 | in_dev = __in_dev_get_rtnl(ndev); |
b7394d24 CW |
699 | |
700 | if (!in_dev || !in_dev->ifa_list) { | |
b7394d24 CW |
701 | np_err(np, "no IP address for %s, aborting\n", |
702 | np->dev_name); | |
703 | err = -EDESTADDRREQ; | |
704 | goto put; | |
705 | } | |
706 | ||
707 | np->local_ip.ip = in_dev->ifa_list->ifa_local; | |
b7394d24 | 708 | np_info(np, "local IP %pI4\n", &np->local_ip.ip); |
b3d936f3 CW |
709 | } else { |
710 | #if IS_ENABLED(CONFIG_IPV6) | |
711 | struct inet6_dev *idev; | |
712 | ||
713 | err = -EDESTADDRREQ; | |
b3d936f3 CW |
714 | idev = __in6_dev_get(ndev); |
715 | if (idev) { | |
716 | struct inet6_ifaddr *ifp; | |
717 | ||
718 | read_lock_bh(&idev->lock); | |
719 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
d016b4a3 MK |
720 | if (!!(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) != |
721 | !!(ipv6_addr_type(&np->remote_ip.in6) & IPV6_ADDR_LINKLOCAL)) | |
b3d936f3 CW |
722 | continue; |
723 | np->local_ip.in6 = ifp->addr; | |
724 | err = 0; | |
725 | break; | |
726 | } | |
727 | read_unlock_bh(&idev->lock); | |
728 | } | |
b3d936f3 CW |
729 | if (err) { |
730 | np_err(np, "no IPv6 address for %s, aborting\n", | |
731 | np->dev_name); | |
732 | goto put; | |
733 | } else | |
734 | np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6); | |
735 | #else | |
736 | np_err(np, "IPv6 is not supported %s, aborting\n", | |
737 | np->dev_name); | |
e39363a9 | 738 | err = -EINVAL; |
b3d936f3 CW |
739 | goto put; |
740 | #endif | |
1da177e4 | 741 | } |
1da177e4 LT |
742 | } |
743 | ||
dbaa1541 HX |
744 | /* fill up the skb queue */ |
745 | refill_skbs(); | |
746 | ||
a8779ec1 | 747 | err = __netpoll_setup(np, ndev); |
8fdd95ec HX |
748 | if (err) |
749 | goto put; | |
750 | ||
f92d3180 | 751 | rtnl_unlock(); |
1da177e4 LT |
752 | return 0; |
753 | ||
21edbb22 | 754 | put: |
1da177e4 | 755 | dev_put(ndev); |
f92d3180 CW |
756 | unlock: |
757 | rtnl_unlock(); | |
b41848b6 | 758 | return err; |
1da177e4 | 759 | } |
9e34a5b5 | 760 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 761 | |
c68b9070 DM |
762 | static int __init netpoll_init(void) |
763 | { | |
a1bcfacd SH |
764 | skb_queue_head_init(&skb_pool); |
765 | return 0; | |
766 | } | |
767 | core_initcall(netpoll_init); | |
768 | ||
38e6bc18 AW |
769 | static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) |
770 | { | |
771 | struct netpoll_info *npinfo = | |
772 | container_of(rcu_head, struct netpoll_info, rcu); | |
773 | ||
38e6bc18 AW |
774 | skb_queue_purge(&npinfo->txq); |
775 | ||
776 | /* we can't call cancel_delayed_work_sync here, as we are in softirq */ | |
777 | cancel_delayed_work(&npinfo->tx_work); | |
778 | ||
779 | /* clean after last, unfinished work */ | |
780 | __skb_queue_purge(&npinfo->txq); | |
781 | /* now cancel it again */ | |
782 | cancel_delayed_work(&npinfo->tx_work); | |
783 | kfree(npinfo); | |
784 | } | |
785 | ||
8fdd95ec | 786 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 787 | { |
fbeec2e1 | 788 | struct netpoll_info *npinfo; |
fbeec2e1 | 789 | |
0790bbb6 | 790 | npinfo = rtnl_dereference(np->dev->npinfo); |
8fdd95ec | 791 | if (!npinfo) |
dbaa1541 | 792 | return; |
93ec2c72 | 793 | |
ca99ca14 NH |
794 | synchronize_srcu(&netpoll_srcu); |
795 | ||
433cea4d | 796 | if (refcount_dec_and_test(&npinfo->refcnt)) { |
8fdd95ec | 797 | const struct net_device_ops *ops; |
de85d99e | 798 | |
8fdd95ec HX |
799 | ops = np->dev->netdev_ops; |
800 | if (ops->ndo_netpoll_cleanup) | |
801 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 802 | |
fcb144b5 | 803 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
5da54c18 | 804 | call_rcu(&npinfo->rcu, rcu_cleanup_netpoll_info); |
efa95b01 | 805 | } else |
806 | RCU_INIT_POINTER(np->dev->npinfo, NULL); | |
38e6bc18 AW |
807 | } |
808 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
de85d99e | 809 | |
c9fbd71f | 810 | void __netpoll_free(struct netpoll *np) |
38e6bc18 | 811 | { |
c9fbd71f | 812 | ASSERT_RTNL(); |
93ec2c72 | 813 | |
c9fbd71f | 814 | /* Wait for transmitting packets to finish before freeing. */ |
5da54c18 | 815 | synchronize_rcu(); |
38e6bc18 AW |
816 | __netpoll_cleanup(np); |
817 | kfree(np); | |
818 | } | |
c9fbd71f | 819 | EXPORT_SYMBOL_GPL(__netpoll_free); |
fbeec2e1 | 820 | |
8fdd95ec HX |
821 | void netpoll_cleanup(struct netpoll *np) |
822 | { | |
8fdd95ec | 823 | rtnl_lock(); |
d0fe8c88 NA |
824 | if (!np->dev) |
825 | goto out; | |
8fdd95ec | 826 | __netpoll_cleanup(np); |
8fdd95ec | 827 | dev_put(np->dev); |
1da177e4 | 828 | np->dev = NULL; |
d0fe8c88 NA |
829 | out: |
830 | rtnl_unlock(); | |
1da177e4 | 831 | } |
9e34a5b5 | 832 | EXPORT_SYMBOL(netpoll_cleanup); |