Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Common framework for low-level network console, dump, and debugger code | |
4 | * | |
5 | * Sep 8 2003 Matt Mackall <mpm@selenic.com> | |
6 | * | |
7 | * based on the netconsole code from: | |
8 | * | |
9 | * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> | |
10 | * Copyright (C) 2002 Red Hat, Inc. | |
11 | */ | |
12 | ||
e6ec2693 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
bff38771 | 15 | #include <linux/moduleparam.h> |
4cd5773a | 16 | #include <linux/kernel.h> |
1da177e4 LT |
17 | #include <linux/netdevice.h> |
18 | #include <linux/etherdevice.h> | |
19 | #include <linux/string.h> | |
14c85021 | 20 | #include <linux/if_arp.h> |
1da177e4 LT |
21 | #include <linux/inetdevice.h> |
22 | #include <linux/inet.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/netpoll.h> | |
25 | #include <linux/sched.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/rcupdate.h> | |
28 | #include <linux/workqueue.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
bc3b2d7f | 30 | #include <linux/export.h> |
689971b4 | 31 | #include <linux/if_vlan.h> |
1da177e4 LT |
32 | #include <net/tcp.h> |
33 | #include <net/udp.h> | |
b3d936f3 CW |
34 | #include <net/addrconf.h> |
35 | #include <net/ndisc.h> | |
36 | #include <net/ip6_checksum.h> | |
1da177e4 | 37 | #include <asm/unaligned.h> |
9cbc1cb8 | 38 | #include <trace/events/napi.h> |
b0f6c9ac | 39 | #include <linux/kconfig.h> |
1da177e4 LT |
40 | |
41 | /* | |
42 | * We maintain a small pool of fully-sized skbs, to make sure the | |
43 | * message gets out even in extreme OOM situations. | |
44 | */ | |
45 | ||
46 | #define MAX_UDP_CHUNK 1460 | |
47 | #define MAX_SKBS 32 | |
1da177e4 | 48 | |
a1bcfacd | 49 | static struct sk_buff_head skb_pool; |
1da177e4 | 50 | |
7f9421c2 | 51 | DEFINE_STATIC_SRCU(netpoll_srcu); |
ca99ca14 | 52 | |
2bdfe0ba | 53 | #define USEC_PER_POLL 50 |
1da177e4 | 54 | |
6f706245 JP |
55 | #define MAX_SKB_SIZE \ |
56 | (sizeof(struct ethhdr) + \ | |
57 | sizeof(struct iphdr) + \ | |
58 | sizeof(struct udphdr) + \ | |
59 | MAX_UDP_CHUNK) | |
1da177e4 | 60 | |
3578b0c8 | 61 | static void zap_completion_queue(void); |
1da177e4 | 62 | |
bff38771 AV |
63 | static unsigned int carrier_timeout = 4; |
64 | module_param(carrier_timeout, uint, 0644); | |
65 | ||
e6ec2693 JP |
66 | #define np_info(np, fmt, ...) \ |
67 | pr_info("%s: " fmt, np->name, ##__VA_ARGS__) | |
68 | #define np_err(np, fmt, ...) \ | |
69 | pr_err("%s: " fmt, np->name, ##__VA_ARGS__) | |
70 | #define np_notice(np, fmt, ...) \ | |
71 | pr_notice("%s: " fmt, np->name, ##__VA_ARGS__) | |
72 | ||
a54776f2 YW |
73 | static netdev_tx_t netpoll_start_xmit(struct sk_buff *skb, |
74 | struct net_device *dev, | |
75 | struct netdev_queue *txq) | |
944e2948 | 76 | { |
a54776f2 | 77 | netdev_tx_t status = NETDEV_TX_OK; |
944e2948 EB |
78 | netdev_features_t features; |
79 | ||
80 | features = netif_skb_features(skb); | |
81 | ||
df8a39de | 82 | if (skb_vlan_tag_present(skb) && |
944e2948 | 83 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { |
5968250c | 84 | skb = __vlan_hwaccel_push_inside(skb); |
944e2948 EB |
85 | if (unlikely(!skb)) { |
86 | /* This is actually a packet drop, but we | |
87 | * don't want the code that calls this | |
88 | * function to try and operate on a NULL skb. | |
89 | */ | |
90 | goto out; | |
91 | } | |
944e2948 EB |
92 | } |
93 | ||
fa2dbdc2 | 94 | status = netdev_start_xmit(skb, dev, txq, false); |
944e2948 EB |
95 | |
96 | out: | |
97 | return status; | |
98 | } | |
99 | ||
c4028958 | 100 | static void queue_process(struct work_struct *work) |
1da177e4 | 101 | { |
4c1ac1b4 DH |
102 | struct netpoll_info *npinfo = |
103 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 104 | struct sk_buff *skb; |
3640543d | 105 | unsigned long flags; |
1da177e4 | 106 | |
6c43ff18 SH |
107 | while ((skb = skb_dequeue(&npinfo->txq))) { |
108 | struct net_device *dev = skb->dev; | |
fd2ea0a7 | 109 | struct netdev_queue *txq; |
c70b17b7 | 110 | unsigned int q_index; |
1da177e4 | 111 | |
6c43ff18 | 112 | if (!netif_device_present(dev) || !netif_running(dev)) { |
080b3c19 | 113 | kfree_skb(skb); |
6c43ff18 SH |
114 | continue; |
115 | } | |
1da177e4 | 116 | |
3640543d | 117 | local_irq_save(flags); |
c70b17b7 TD |
118 | /* check if skb->queue_mapping is still valid */ |
119 | q_index = skb_get_queue_mapping(skb); | |
120 | if (unlikely(q_index >= dev->real_num_tx_queues)) { | |
121 | q_index = q_index % dev->real_num_tx_queues; | |
122 | skb_set_queue_mapping(skb, q_index); | |
123 | } | |
124 | txq = netdev_get_tx_queue(dev, q_index); | |
5efeac44 | 125 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
73466498 | 126 | if (netif_xmit_frozen_or_stopped(txq) || |
2c1644cf | 127 | !dev_xmit_complete(netpoll_start_xmit(skb, dev, txq))) { |
6c43ff18 | 128 | skb_queue_head(&npinfo->txq, skb); |
5efeac44 | 129 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 130 | local_irq_restore(flags); |
1da177e4 | 131 | |
25442caf | 132 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
133 | return; |
134 | } | |
5efeac44 | 135 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 136 | local_irq_restore(flags); |
1da177e4 | 137 | } |
1da177e4 LT |
138 | } |
139 | ||
275b471e JK |
140 | static int netif_local_xmit_active(struct net_device *dev) |
141 | { | |
142 | int i; | |
143 | ||
144 | for (i = 0; i < dev->num_tx_queues; i++) { | |
145 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
146 | ||
147 | if (READ_ONCE(txq->xmit_lock_owner) == smp_processor_id()) | |
148 | return 1; | |
149 | } | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
822d54b9 | 154 | static void poll_one_napi(struct napi_struct *napi) |
0a7606c1 | 155 | { |
c24498c6 | 156 | int work; |
0a7606c1 | 157 | |
2d8bff12 NH |
158 | /* If we set this bit but see that it has already been set, |
159 | * that indicates that napi has been disabled and we need | |
160 | * to abort this operation | |
161 | */ | |
162 | if (test_and_set_bit(NAPI_STATE_NPSVC, &napi->state)) | |
822d54b9 | 163 | return; |
0a7606c1 | 164 | |
822d54b9 AD |
165 | /* We explicilty pass the polling call a budget of 0 to |
166 | * indicate that we are clearing the Tx path only. | |
167 | */ | |
168 | work = napi->poll(napi, 0); | |
d75f773c | 169 | WARN_ONCE(work, "%pS exceeded budget in poll\n", napi->poll); |
1db19db7 | 170 | trace_napi_poll(napi, work, 0); |
0a7606c1 | 171 | |
7b363e44 | 172 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
173 | } |
174 | ||
822d54b9 | 175 | static void poll_napi(struct net_device *dev) |
1da177e4 | 176 | { |
bea3348e | 177 | struct napi_struct *napi; |
89c4b442 | 178 | int cpu = smp_processor_id(); |
1da177e4 | 179 | |
96e97bc0 | 180 | list_for_each_entry_rcu(napi, &dev->napi_list, dev_list) { |
89c4b442 | 181 | if (cmpxchg(&napi->poll_owner, -1, cpu) == -1) { |
822d54b9 | 182 | poll_one_napi(napi); |
89c4b442 | 183 | smp_store_release(&napi->poll_owner, -1); |
bea3348e | 184 | } |
1da177e4 LT |
185 | } |
186 | } | |
187 | ||
ac3d9dd0 | 188 | void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 189 | { |
2899656b | 190 | struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo); |
ac3d9dd0 | 191 | const struct net_device_ops *ops; |
5106930b | 192 | |
ca99ca14 NH |
193 | /* Don't do any rx activity if the dev_lock mutex is held |
194 | * the dev_open/close paths use this to block netpoll activity | |
195 | * while changing device state | |
196 | */ | |
ac3d9dd0 | 197 | if (!ni || down_trylock(&ni->dev_lock)) |
ca99ca14 NH |
198 | return; |
199 | ||
275b471e JK |
200 | /* Some drivers will take the same locks in poll and xmit, |
201 | * we can't poll if local CPU is already in xmit. | |
202 | */ | |
203 | if (!netif_running(dev) || netif_local_xmit_active(dev)) { | |
bd7c4b60 | 204 | up(&ni->dev_lock); |
5e392739 | 205 | return; |
959d5fde | 206 | } |
5e392739 PE |
207 | |
208 | ops = dev->netdev_ops; | |
ac3d9dd0 ED |
209 | if (ops->ndo_poll_controller) |
210 | ops->ndo_poll_controller(dev); | |
5106930b | 211 | |
822d54b9 | 212 | poll_napi(dev); |
1da177e4 | 213 | |
bd7c4b60 | 214 | up(&ni->dev_lock); |
ca99ca14 | 215 | |
3578b0c8 | 216 | zap_completion_queue(); |
1da177e4 | 217 | } |
ac3d9dd0 | 218 | EXPORT_SYMBOL(netpoll_poll_dev); |
1da177e4 | 219 | |
66b5552f | 220 | void netpoll_poll_disable(struct net_device *dev) |
ca99ca14 NH |
221 | { |
222 | struct netpoll_info *ni; | |
223 | int idx; | |
224 | might_sleep(); | |
225 | idx = srcu_read_lock(&netpoll_srcu); | |
226 | ni = srcu_dereference(dev->npinfo, &netpoll_srcu); | |
227 | if (ni) | |
bd7c4b60 | 228 | down(&ni->dev_lock); |
ca99ca14 | 229 | srcu_read_unlock(&netpoll_srcu, idx); |
ca99ca14 | 230 | } |
66b5552f | 231 | EXPORT_SYMBOL(netpoll_poll_disable); |
ca99ca14 | 232 | |
66b5552f | 233 | void netpoll_poll_enable(struct net_device *dev) |
ca99ca14 NH |
234 | { |
235 | struct netpoll_info *ni; | |
236 | rcu_read_lock(); | |
237 | ni = rcu_dereference(dev->npinfo); | |
238 | if (ni) | |
bd7c4b60 | 239 | up(&ni->dev_lock); |
ca99ca14 NH |
240 | rcu_read_unlock(); |
241 | } | |
66b5552f | 242 | EXPORT_SYMBOL(netpoll_poll_enable); |
ca99ca14 | 243 | |
1da177e4 LT |
244 | static void refill_skbs(void) |
245 | { | |
246 | struct sk_buff *skb; | |
247 | unsigned long flags; | |
248 | ||
a1bcfacd SH |
249 | spin_lock_irqsave(&skb_pool.lock, flags); |
250 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
251 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
252 | if (!skb) | |
253 | break; | |
254 | ||
a1bcfacd | 255 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 256 | } |
a1bcfacd | 257 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
258 | } |
259 | ||
3578b0c8 DM |
260 | static void zap_completion_queue(void) |
261 | { | |
262 | unsigned long flags; | |
263 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
264 | ||
265 | if (sd->completion_queue) { | |
266 | struct sk_buff *clist; | |
267 | ||
268 | local_irq_save(flags); | |
269 | clist = sd->completion_queue; | |
270 | sd->completion_queue = NULL; | |
271 | local_irq_restore(flags); | |
272 | ||
273 | while (clist != NULL) { | |
274 | struct sk_buff *skb = clist; | |
275 | clist = clist->next; | |
b1586f09 | 276 | if (!skb_irq_freeable(skb)) { |
230cd127 | 277 | refcount_set(&skb->users, 1); |
3578b0c8 DM |
278 | dev_kfree_skb_any(skb); /* put this one back */ |
279 | } else { | |
280 | __kfree_skb(skb); | |
281 | } | |
282 | } | |
283 | } | |
284 | ||
285 | put_cpu_var(softnet_data); | |
286 | } | |
287 | ||
a1bcfacd | 288 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 289 | { |
a1bcfacd SH |
290 | int count = 0; |
291 | struct sk_buff *skb; | |
1da177e4 | 292 | |
3578b0c8 | 293 | zap_completion_queue(); |
a1bcfacd | 294 | refill_skbs(); |
1da177e4 | 295 | repeat: |
1da177e4 LT |
296 | |
297 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
298 | if (!skb) |
299 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
300 | |
301 | if (!skb) { | |
a1bcfacd | 302 | if (++count < 10) { |
2a49e001 | 303 | netpoll_poll_dev(np->dev); |
a1bcfacd | 304 | goto repeat; |
1da177e4 | 305 | } |
a1bcfacd | 306 | return NULL; |
1da177e4 LT |
307 | } |
308 | ||
63354797 | 309 | refcount_set(&skb->users, 1); |
1da177e4 LT |
310 | skb_reserve(skb, reserve); |
311 | return skb; | |
312 | } | |
313 | ||
bea3348e SH |
314 | static int netpoll_owner_active(struct net_device *dev) |
315 | { | |
316 | struct napi_struct *napi; | |
317 | ||
5251ef82 | 318 | list_for_each_entry_rcu(napi, &dev->napi_list, dev_list) { |
bea3348e SH |
319 | if (napi->poll_owner == smp_processor_id()) |
320 | return 1; | |
321 | } | |
322 | return 0; | |
323 | } | |
324 | ||
2899656b | 325 | /* call with IRQ disabled */ |
1ddabdfa | 326 | static netdev_tx_t __netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
1da177e4 | 327 | { |
a54776f2 | 328 | netdev_tx_t status = NETDEV_TX_BUSY; |
307f660d | 329 | struct net_device *dev; |
2bdfe0ba | 330 | unsigned long tries; |
de85d99e | 331 | /* It is up to the caller to keep npinfo alive. */ |
2899656b | 332 | struct netpoll_info *npinfo; |
2bdfe0ba | 333 | |
af073393 | 334 | lockdep_assert_irqs_disabled(); |
2899656b | 335 | |
307f660d ED |
336 | dev = np->dev; |
337 | npinfo = rcu_dereference_bh(dev->npinfo); | |
338 | ||
4ec93edb | 339 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
080b3c19 | 340 | dev_kfree_skb_irq(skb); |
1ddabdfa | 341 | return NET_XMIT_DROP; |
4ec93edb | 342 | } |
2bdfe0ba SH |
343 | |
344 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 345 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 346 | struct netdev_queue *txq; |
a49f99ff | 347 | |
4bd97d51 | 348 | txq = netdev_core_pick_tx(dev, skb, NULL); |
fd2ea0a7 | 349 | |
0db3dc73 SH |
350 | /* try until next clock tick */ |
351 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
352 | tries > 0; --tries) { | |
5efeac44 | 353 | if (HARD_TX_TRYLOCK(dev, txq)) { |
944e2948 EB |
354 | if (!netif_xmit_stopped(txq)) |
355 | status = netpoll_start_xmit(skb, dev, txq); | |
356 | ||
5efeac44 | 357 | HARD_TX_UNLOCK(dev, txq); |
e37b8d93 | 358 | |
2c1644cf | 359 | if (dev_xmit_complete(status)) |
e37b8d93 AM |
360 | break; |
361 | ||
e37b8d93 | 362 | } |
0db3dc73 SH |
363 | |
364 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 365 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
366 | |
367 | udelay(USEC_PER_POLL); | |
0db1d6fc | 368 | } |
79b1bee8 DD |
369 | |
370 | WARN_ONCE(!irqs_disabled(), | |
d75f773c | 371 | "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pS)\n", |
944e2948 | 372 | dev->name, dev->netdev_ops->ndo_start_xmit); |
79b1bee8 | 373 | |
1da177e4 | 374 | } |
1da177e4 | 375 | |
2c1644cf | 376 | if (!dev_xmit_complete(status)) { |
5de4a473 | 377 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 378 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 379 | } |
1ddabdfa | 380 | return NETDEV_TX_OK; |
1da177e4 | 381 | } |
fb1eee47 | 382 | |
1ddabdfa | 383 | netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
fb1eee47 ED |
384 | { |
385 | unsigned long flags; | |
1ddabdfa | 386 | netdev_tx_t ret; |
fb1eee47 | 387 | |
f78ed220 ED |
388 | if (unlikely(!np)) { |
389 | dev_kfree_skb_irq(skb); | |
390 | ret = NET_XMIT_DROP; | |
391 | } else { | |
392 | local_irq_save(flags); | |
393 | ret = __netpoll_send_skb(np, skb); | |
394 | local_irq_restore(flags); | |
395 | } | |
1ddabdfa | 396 | return ret; |
fb1eee47 ED |
397 | } |
398 | EXPORT_SYMBOL(netpoll_send_skb); | |
1da177e4 LT |
399 | |
400 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
401 | { | |
954fba02 | 402 | int total_len, ip_len, udp_len; |
1da177e4 LT |
403 | struct sk_buff *skb; |
404 | struct udphdr *udph; | |
405 | struct iphdr *iph; | |
406 | struct ethhdr *eth; | |
ee130409 | 407 | static atomic_t ip_ident; |
b3d936f3 | 408 | struct ipv6hdr *ip6h; |
1da177e4 | 409 | |
b0f6c9ac WLC |
410 | if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
411 | WARN_ON_ONCE(!irqs_disabled()); | |
c9fd56b3 | 412 | |
1da177e4 | 413 | udp_len = len + sizeof(*udph); |
b3d936f3 CW |
414 | if (np->ipv6) |
415 | ip_len = udp_len + sizeof(*ip6h); | |
416 | else | |
b7394d24 CW |
417 | ip_len = udp_len + sizeof(*iph); |
418 | ||
954fba02 | 419 | total_len = ip_len + LL_RESERVED_SPACE(np->dev); |
1da177e4 | 420 | |
954fba02 ED |
421 | skb = find_skb(np, total_len + np->dev->needed_tailroom, |
422 | total_len - len); | |
1da177e4 LT |
423 | if (!skb) |
424 | return; | |
425 | ||
27d7ff46 | 426 | skb_copy_to_linear_data(skb, msg, len); |
954fba02 | 427 | skb_put(skb, len); |
1da177e4 | 428 | |
4bedb452 ACM |
429 | skb_push(skb, sizeof(*udph)); |
430 | skb_reset_transport_header(skb); | |
431 | udph = udp_hdr(skb); | |
1da177e4 LT |
432 | udph->source = htons(np->local_port); |
433 | udph->dest = htons(np->remote_port); | |
434 | udph->len = htons(udp_len); | |
b7394d24 | 435 | |
b3d936f3 CW |
436 | if (np->ipv6) { |
437 | udph->check = 0; | |
438 | udph->check = csum_ipv6_magic(&np->local_ip.in6, | |
439 | &np->remote_ip.in6, | |
440 | udp_len, IPPROTO_UDP, | |
441 | csum_partial(udph, udp_len, 0)); | |
442 | if (udph->check == 0) | |
443 | udph->check = CSUM_MANGLED_0; | |
444 | ||
445 | skb_push(skb, sizeof(*ip6h)); | |
446 | skb_reset_network_header(skb); | |
447 | ip6h = ipv6_hdr(skb); | |
448 | ||
449 | /* ip6h->version = 6; ip6h->priority = 0; */ | |
e3e22076 | 450 | *(unsigned char *)ip6h = 0x60; |
b3d936f3 CW |
451 | ip6h->flow_lbl[0] = 0; |
452 | ip6h->flow_lbl[1] = 0; | |
453 | ip6h->flow_lbl[2] = 0; | |
454 | ||
455 | ip6h->payload_len = htons(sizeof(struct udphdr) + len); | |
456 | ip6h->nexthdr = IPPROTO_UDP; | |
457 | ip6h->hop_limit = 32; | |
458 | ip6h->saddr = np->local_ip.in6; | |
459 | ip6h->daddr = np->remote_ip.in6; | |
460 | ||
d58ff351 | 461 | eth = skb_push(skb, ETH_HLEN); |
b3d936f3 CW |
462 | skb_reset_mac_header(skb); |
463 | skb->protocol = eth->h_proto = htons(ETH_P_IPV6); | |
464 | } else { | |
b7394d24 CW |
465 | udph->check = 0; |
466 | udph->check = csum_tcpudp_magic(np->local_ip.ip, | |
467 | np->remote_ip.ip, | |
468 | udp_len, IPPROTO_UDP, | |
469 | csum_partial(udph, udp_len, 0)); | |
470 | if (udph->check == 0) | |
471 | udph->check = CSUM_MANGLED_0; | |
472 | ||
473 | skb_push(skb, sizeof(*iph)); | |
474 | skb_reset_network_header(skb); | |
475 | iph = ip_hdr(skb); | |
476 | ||
477 | /* iph->version = 4; iph->ihl = 5; */ | |
e3e22076 | 478 | *(unsigned char *)iph = 0x45; |
b7394d24 CW |
479 | iph->tos = 0; |
480 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
481 | iph->id = htons(atomic_inc_return(&ip_ident)); | |
482 | iph->frag_off = 0; | |
483 | iph->ttl = 64; | |
484 | iph->protocol = IPPROTO_UDP; | |
485 | iph->check = 0; | |
486 | put_unaligned(np->local_ip.ip, &(iph->saddr)); | |
487 | put_unaligned(np->remote_ip.ip, &(iph->daddr)); | |
488 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
489 | ||
d58ff351 | 490 | eth = skb_push(skb, ETH_HLEN); |
b7394d24 CW |
491 | skb_reset_mac_header(skb); |
492 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
493 | } | |
494 | ||
c62326ab JP |
495 | ether_addr_copy(eth->h_source, np->dev->dev_addr); |
496 | ether_addr_copy(eth->h_dest, np->remote_mac); | |
1da177e4 LT |
497 | |
498 | skb->dev = np->dev; | |
499 | ||
500 | netpoll_send_skb(np, skb); | |
501 | } | |
9e34a5b5 | 502 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 | 503 | |
0bcc1816 SS |
504 | void netpoll_print_options(struct netpoll *np) |
505 | { | |
e6ec2693 | 506 | np_info(np, "local port %d\n", np->local_port); |
b3d936f3 CW |
507 | if (np->ipv6) |
508 | np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6); | |
509 | else | |
b7394d24 | 510 | np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip); |
e6ec2693 JP |
511 | np_info(np, "interface '%s'\n", np->dev_name); |
512 | np_info(np, "remote port %d\n", np->remote_port); | |
b3d936f3 CW |
513 | if (np->ipv6) |
514 | np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6); | |
515 | else | |
b7394d24 | 516 | np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip); |
e6ec2693 | 517 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); |
0bcc1816 | 518 | } |
9e34a5b5 | 519 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 520 | |
b7394d24 CW |
521 | static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr) |
522 | { | |
523 | const char *end; | |
524 | ||
525 | if (!strchr(str, ':') && | |
526 | in4_pton(str, -1, (void *)addr, -1, &end) > 0) { | |
527 | if (!*end) | |
528 | return 0; | |
529 | } | |
530 | if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) { | |
531 | #if IS_ENABLED(CONFIG_IPV6) | |
532 | if (!*end) | |
533 | return 1; | |
534 | #else | |
535 | return -1; | |
536 | #endif | |
537 | } | |
538 | return -1; | |
539 | } | |
540 | ||
1da177e4 LT |
541 | int netpoll_parse_options(struct netpoll *np, char *opt) |
542 | { | |
543 | char *cur=opt, *delim; | |
b7394d24 | 544 | int ipv6; |
00fe11b3 | 545 | bool ipversion_set = false; |
1da177e4 | 546 | |
c68b9070 | 547 | if (*cur != '@') { |
1da177e4 LT |
548 | if ((delim = strchr(cur, '@')) == NULL) |
549 | goto parse_failed; | |
c68b9070 | 550 | *delim = 0; |
4b5511eb AP |
551 | if (kstrtou16(cur, 10, &np->local_port)) |
552 | goto parse_failed; | |
c68b9070 | 553 | cur = delim; |
1da177e4 LT |
554 | } |
555 | cur++; | |
1da177e4 | 556 | |
c68b9070 | 557 | if (*cur != '/') { |
00fe11b3 | 558 | ipversion_set = true; |
1da177e4 LT |
559 | if ((delim = strchr(cur, '/')) == NULL) |
560 | goto parse_failed; | |
c68b9070 | 561 | *delim = 0; |
b7394d24 CW |
562 | ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip); |
563 | if (ipv6 < 0) | |
564 | goto parse_failed; | |
565 | else | |
566 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 567 | cur = delim; |
1da177e4 LT |
568 | } |
569 | cur++; | |
570 | ||
c68b9070 | 571 | if (*cur != ',') { |
1da177e4 LT |
572 | /* parse out dev name */ |
573 | if ((delim = strchr(cur, ',')) == NULL) | |
574 | goto parse_failed; | |
c68b9070 | 575 | *delim = 0; |
70986397 | 576 | strscpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 577 | cur = delim; |
1da177e4 LT |
578 | } |
579 | cur++; | |
580 | ||
c68b9070 | 581 | if (*cur != '@') { |
1da177e4 LT |
582 | /* dst port */ |
583 | if ((delim = strchr(cur, '@')) == NULL) | |
584 | goto parse_failed; | |
c68b9070 | 585 | *delim = 0; |
5fc05f87 | 586 | if (*cur == ' ' || *cur == '\t') |
e6ec2693 | 587 | np_info(np, "warning: whitespace is not allowed\n"); |
4b5511eb AP |
588 | if (kstrtou16(cur, 10, &np->remote_port)) |
589 | goto parse_failed; | |
c68b9070 | 590 | cur = delim; |
1da177e4 LT |
591 | } |
592 | cur++; | |
1da177e4 LT |
593 | |
594 | /* dst ip */ | |
595 | if ((delim = strchr(cur, '/')) == NULL) | |
596 | goto parse_failed; | |
c68b9070 | 597 | *delim = 0; |
b7394d24 CW |
598 | ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip); |
599 | if (ipv6 < 0) | |
600 | goto parse_failed; | |
00fe11b3 | 601 | else if (ipversion_set && np->ipv6 != (bool)ipv6) |
b7394d24 CW |
602 | goto parse_failed; |
603 | else | |
604 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 605 | cur = delim + 1; |
1da177e4 | 606 | |
c68b9070 | 607 | if (*cur != 0) { |
1da177e4 | 608 | /* MAC address */ |
4940fc88 | 609 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 610 | goto parse_failed; |
1da177e4 LT |
611 | } |
612 | ||
0bcc1816 | 613 | netpoll_print_options(np); |
1da177e4 LT |
614 | |
615 | return 0; | |
616 | ||
617 | parse_failed: | |
e6ec2693 | 618 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
1da177e4 LT |
619 | return -1; |
620 | } | |
9e34a5b5 | 621 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 622 | |
a8779ec1 | 623 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev) |
1da177e4 | 624 | { |
115c1d6e | 625 | struct netpoll_info *npinfo; |
4247e161 | 626 | const struct net_device_ops *ops; |
b41848b6 | 627 | int err; |
1da177e4 | 628 | |
727ceaa4 | 629 | np->dev = ndev; |
70986397 | 630 | strscpy(np->dev_name, ndev->name, IFNAMSIZ); |
30fdd8a0 | 631 | |
ac3d9dd0 | 632 | if (ndev->priv_flags & IFF_DISABLE_NETPOLL) { |
e6ec2693 JP |
633 | np_err(np, "%s doesn't support polling, aborting\n", |
634 | np->dev_name); | |
8fdd95ec HX |
635 | err = -ENOTSUPP; |
636 | goto out; | |
637 | } | |
638 | ||
639 | if (!ndev->npinfo) { | |
a8779ec1 | 640 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
8fdd95ec HX |
641 | if (!npinfo) { |
642 | err = -ENOMEM; | |
643 | goto out; | |
644 | } | |
645 | ||
bd7c4b60 | 646 | sema_init(&npinfo->dev_lock, 1); |
8fdd95ec HX |
647 | skb_queue_head_init(&npinfo->txq); |
648 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
649 | ||
433cea4d | 650 | refcount_set(&npinfo->refcnt, 1); |
8fdd95ec HX |
651 | |
652 | ops = np->dev->netdev_ops; | |
653 | if (ops->ndo_netpoll_setup) { | |
a8779ec1 | 654 | err = ops->ndo_netpoll_setup(ndev, npinfo); |
8fdd95ec HX |
655 | if (err) |
656 | goto free_npinfo; | |
657 | } | |
658 | } else { | |
0790bbb6 | 659 | npinfo = rtnl_dereference(ndev->npinfo); |
433cea4d | 660 | refcount_inc(&npinfo->refcnt); |
8fdd95ec HX |
661 | } |
662 | ||
663 | npinfo->netpoll = np; | |
664 | ||
8fdd95ec | 665 | /* last thing to do is link it to the net device structure */ |
cf778b00 | 666 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
667 | |
668 | return 0; | |
669 | ||
670 | free_npinfo: | |
671 | kfree(npinfo); | |
672 | out: | |
673 | return err; | |
674 | } | |
675 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
676 | ||
677 | int netpoll_setup(struct netpoll *np) | |
678 | { | |
ea92000d | 679 | struct net_device *ndev = NULL; |
8fdd95ec HX |
680 | struct in_device *in_dev; |
681 | int err; | |
682 | ||
f92d3180 | 683 | rtnl_lock(); |
ea92000d VO |
684 | if (np->dev_name[0]) { |
685 | struct net *net = current->nsproxy->net_ns; | |
556e6256 | 686 | ndev = __dev_get_by_name(net, np->dev_name); |
ea92000d | 687 | } |
1da177e4 | 688 | if (!ndev) { |
e6ec2693 | 689 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
f92d3180 CW |
690 | err = -ENODEV; |
691 | goto unlock; | |
1da177e4 | 692 | } |
5bd30d39 | 693 | dev_hold(ndev); |
1da177e4 | 694 | |
49bd8fb0 | 695 | if (netdev_master_upper_dev_get(ndev)) { |
e6ec2693 | 696 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
83fe32de DC |
697 | err = -EBUSY; |
698 | goto put; | |
0c1ad04a WC |
699 | } |
700 | ||
1da177e4 | 701 | if (!netif_running(ndev)) { |
d8afe2f8 | 702 | unsigned long atmost; |
1da177e4 | 703 | |
e6ec2693 | 704 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
1da177e4 | 705 | |
00f54e68 | 706 | err = dev_open(ndev, NULL); |
b41848b6 SH |
707 | |
708 | if (err) { | |
e6ec2693 | 709 | np_err(np, "failed to open %s\n", ndev->name); |
dbaa1541 | 710 | goto put; |
1da177e4 | 711 | } |
1da177e4 | 712 | |
f92d3180 | 713 | rtnl_unlock(); |
bff38771 | 714 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
715 | while (!netif_carrier_ok(ndev)) { |
716 | if (time_after(jiffies, atmost)) { | |
e6ec2693 | 717 | np_notice(np, "timeout waiting for carrier\n"); |
1da177e4 LT |
718 | break; |
719 | } | |
1b614fb9 | 720 | msleep(1); |
1da177e4 LT |
721 | } |
722 | ||
f92d3180 | 723 | rtnl_lock(); |
1da177e4 LT |
724 | } |
725 | ||
b7394d24 CW |
726 | if (!np->local_ip.ip) { |
727 | if (!np->ipv6) { | |
2638eb8b FW |
728 | const struct in_ifaddr *ifa; |
729 | ||
f92d3180 | 730 | in_dev = __in_dev_get_rtnl(ndev); |
2638eb8b FW |
731 | if (!in_dev) |
732 | goto put_noaddr; | |
b7394d24 | 733 | |
2638eb8b FW |
734 | ifa = rtnl_dereference(in_dev->ifa_list); |
735 | if (!ifa) { | |
736 | put_noaddr: | |
b7394d24 CW |
737 | np_err(np, "no IP address for %s, aborting\n", |
738 | np->dev_name); | |
739 | err = -EDESTADDRREQ; | |
740 | goto put; | |
741 | } | |
742 | ||
2638eb8b | 743 | np->local_ip.ip = ifa->ifa_local; |
b7394d24 | 744 | np_info(np, "local IP %pI4\n", &np->local_ip.ip); |
b3d936f3 CW |
745 | } else { |
746 | #if IS_ENABLED(CONFIG_IPV6) | |
747 | struct inet6_dev *idev; | |
748 | ||
749 | err = -EDESTADDRREQ; | |
b3d936f3 CW |
750 | idev = __in6_dev_get(ndev); |
751 | if (idev) { | |
752 | struct inet6_ifaddr *ifp; | |
753 | ||
754 | read_lock_bh(&idev->lock); | |
755 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
d016b4a3 MK |
756 | if (!!(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) != |
757 | !!(ipv6_addr_type(&np->remote_ip.in6) & IPV6_ADDR_LINKLOCAL)) | |
b3d936f3 CW |
758 | continue; |
759 | np->local_ip.in6 = ifp->addr; | |
760 | err = 0; | |
761 | break; | |
762 | } | |
763 | read_unlock_bh(&idev->lock); | |
764 | } | |
b3d936f3 CW |
765 | if (err) { |
766 | np_err(np, "no IPv6 address for %s, aborting\n", | |
767 | np->dev_name); | |
768 | goto put; | |
769 | } else | |
770 | np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6); | |
771 | #else | |
772 | np_err(np, "IPv6 is not supported %s, aborting\n", | |
773 | np->dev_name); | |
e39363a9 | 774 | err = -EINVAL; |
b3d936f3 CW |
775 | goto put; |
776 | #endif | |
1da177e4 | 777 | } |
1da177e4 LT |
778 | } |
779 | ||
dbaa1541 HX |
780 | /* fill up the skb queue */ |
781 | refill_skbs(); | |
782 | ||
a8779ec1 | 783 | err = __netpoll_setup(np, ndev); |
8fdd95ec HX |
784 | if (err) |
785 | goto put; | |
5fa5ae60 | 786 | netdev_tracker_alloc(ndev, &np->dev_tracker, GFP_KERNEL); |
f92d3180 | 787 | rtnl_unlock(); |
1da177e4 LT |
788 | return 0; |
789 | ||
21edbb22 | 790 | put: |
1da177e4 | 791 | dev_put(ndev); |
f92d3180 CW |
792 | unlock: |
793 | rtnl_unlock(); | |
b41848b6 | 794 | return err; |
1da177e4 | 795 | } |
9e34a5b5 | 796 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 797 | |
c68b9070 DM |
798 | static int __init netpoll_init(void) |
799 | { | |
a1bcfacd SH |
800 | skb_queue_head_init(&skb_pool); |
801 | return 0; | |
802 | } | |
803 | core_initcall(netpoll_init); | |
804 | ||
38e6bc18 AW |
805 | static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) |
806 | { | |
807 | struct netpoll_info *npinfo = | |
808 | container_of(rcu_head, struct netpoll_info, rcu); | |
809 | ||
38e6bc18 AW |
810 | skb_queue_purge(&npinfo->txq); |
811 | ||
812 | /* we can't call cancel_delayed_work_sync here, as we are in softirq */ | |
813 | cancel_delayed_work(&npinfo->tx_work); | |
814 | ||
815 | /* clean after last, unfinished work */ | |
816 | __skb_queue_purge(&npinfo->txq); | |
817 | /* now cancel it again */ | |
818 | cancel_delayed_work(&npinfo->tx_work); | |
819 | kfree(npinfo); | |
820 | } | |
821 | ||
8fdd95ec | 822 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 823 | { |
fbeec2e1 | 824 | struct netpoll_info *npinfo; |
fbeec2e1 | 825 | |
0790bbb6 | 826 | npinfo = rtnl_dereference(np->dev->npinfo); |
8fdd95ec | 827 | if (!npinfo) |
dbaa1541 | 828 | return; |
93ec2c72 | 829 | |
ca99ca14 NH |
830 | synchronize_srcu(&netpoll_srcu); |
831 | ||
433cea4d | 832 | if (refcount_dec_and_test(&npinfo->refcnt)) { |
8fdd95ec | 833 | const struct net_device_ops *ops; |
de85d99e | 834 | |
8fdd95ec HX |
835 | ops = np->dev->netdev_ops; |
836 | if (ops->ndo_netpoll_cleanup) | |
837 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 838 | |
fcb144b5 | 839 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
5da54c18 | 840 | call_rcu(&npinfo->rcu, rcu_cleanup_netpoll_info); |
efa95b01 | 841 | } else |
842 | RCU_INIT_POINTER(np->dev->npinfo, NULL); | |
38e6bc18 AW |
843 | } |
844 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
de85d99e | 845 | |
c9fbd71f | 846 | void __netpoll_free(struct netpoll *np) |
38e6bc18 | 847 | { |
c9fbd71f | 848 | ASSERT_RTNL(); |
93ec2c72 | 849 | |
c9fbd71f | 850 | /* Wait for transmitting packets to finish before freeing. */ |
5da54c18 | 851 | synchronize_rcu(); |
38e6bc18 AW |
852 | __netpoll_cleanup(np); |
853 | kfree(np); | |
854 | } | |
c9fbd71f | 855 | EXPORT_SYMBOL_GPL(__netpoll_free); |
fbeec2e1 | 856 | |
8fdd95ec HX |
857 | void netpoll_cleanup(struct netpoll *np) |
858 | { | |
8fdd95ec | 859 | rtnl_lock(); |
d0fe8c88 NA |
860 | if (!np->dev) |
861 | goto out; | |
8fdd95ec | 862 | __netpoll_cleanup(np); |
d62607c3 | 863 | netdev_put(np->dev, &np->dev_tracker); |
1da177e4 | 864 | np->dev = NULL; |
d0fe8c88 NA |
865 | out: |
866 | rtnl_unlock(); | |
1da177e4 | 867 | } |
9e34a5b5 | 868 | EXPORT_SYMBOL(netpoll_cleanup); |