Commit | Line | Data |
---|---|---|
c0c77d8f BT |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* XDP sockets | |
3 | * | |
4 | * AF_XDP sockets allows a channel between XDP programs and userspace | |
5 | * applications. | |
6 | * Copyright(c) 2018 Intel Corporation. | |
7 | * | |
c0c77d8f BT |
8 | * Author(s): Björn Töpel <bjorn.topel@intel.com> |
9 | * Magnus Karlsson <magnus.karlsson@intel.com> | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) "AF_XDP: %s: " fmt, __func__ | |
13 | ||
14 | #include <linux/if_xdp.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/sched/mm.h> | |
17 | #include <linux/sched/signal.h> | |
18 | #include <linux/sched/task.h> | |
19 | #include <linux/socket.h> | |
20 | #include <linux/file.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/net.h> | |
23 | #include <linux/netdevice.h> | |
ac98d8aa | 24 | #include <linux/rculist.h> |
a71506a4 | 25 | #include <net/xdp_sock_drv.h> |
b9b6b68e | 26 | #include <net/xdp.h> |
c0c77d8f | 27 | |
423f3832 | 28 | #include "xsk_queue.h" |
c0c77d8f | 29 | #include "xdp_umem.h" |
a36b38aa | 30 | #include "xsk.h" |
c0c77d8f | 31 | |
35fcde7f MK |
32 | #define TX_BATCH_SIZE 16 |
33 | ||
e312b9e7 BT |
34 | static DEFINE_PER_CPU(struct list_head, xskmap_flush_list); |
35 | ||
fbfc504a BT |
36 | bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) |
37 | { | |
173d3adb BT |
38 | return READ_ONCE(xs->rx) && READ_ONCE(xs->umem) && |
39 | READ_ONCE(xs->umem->fq); | |
fbfc504a BT |
40 | } |
41 | ||
77cd0d7b MK |
42 | void xsk_set_rx_need_wakeup(struct xdp_umem *umem) |
43 | { | |
44 | if (umem->need_wakeup & XDP_WAKEUP_RX) | |
45 | return; | |
46 | ||
47 | umem->fq->ring->flags |= XDP_RING_NEED_WAKEUP; | |
48 | umem->need_wakeup |= XDP_WAKEUP_RX; | |
49 | } | |
50 | EXPORT_SYMBOL(xsk_set_rx_need_wakeup); | |
51 | ||
52 | void xsk_set_tx_need_wakeup(struct xdp_umem *umem) | |
53 | { | |
54 | struct xdp_sock *xs; | |
55 | ||
56 | if (umem->need_wakeup & XDP_WAKEUP_TX) | |
57 | return; | |
58 | ||
59 | rcu_read_lock(); | |
e4e5aefc | 60 | list_for_each_entry_rcu(xs, &umem->xsk_tx_list, list) { |
77cd0d7b MK |
61 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; |
62 | } | |
63 | rcu_read_unlock(); | |
64 | ||
65 | umem->need_wakeup |= XDP_WAKEUP_TX; | |
66 | } | |
67 | EXPORT_SYMBOL(xsk_set_tx_need_wakeup); | |
68 | ||
69 | void xsk_clear_rx_need_wakeup(struct xdp_umem *umem) | |
70 | { | |
71 | if (!(umem->need_wakeup & XDP_WAKEUP_RX)) | |
72 | return; | |
73 | ||
74 | umem->fq->ring->flags &= ~XDP_RING_NEED_WAKEUP; | |
75 | umem->need_wakeup &= ~XDP_WAKEUP_RX; | |
76 | } | |
77 | EXPORT_SYMBOL(xsk_clear_rx_need_wakeup); | |
78 | ||
79 | void xsk_clear_tx_need_wakeup(struct xdp_umem *umem) | |
80 | { | |
81 | struct xdp_sock *xs; | |
82 | ||
83 | if (!(umem->need_wakeup & XDP_WAKEUP_TX)) | |
84 | return; | |
85 | ||
86 | rcu_read_lock(); | |
e4e5aefc | 87 | list_for_each_entry_rcu(xs, &umem->xsk_tx_list, list) { |
77cd0d7b MK |
88 | xs->tx->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
89 | } | |
90 | rcu_read_unlock(); | |
91 | ||
92 | umem->need_wakeup &= ~XDP_WAKEUP_TX; | |
93 | } | |
94 | EXPORT_SYMBOL(xsk_clear_tx_need_wakeup); | |
95 | ||
96 | bool xsk_umem_uses_need_wakeup(struct xdp_umem *umem) | |
97 | { | |
98 | return umem->flags & XDP_UMEM_USES_NEED_WAKEUP; | |
99 | } | |
100 | EXPORT_SYMBOL(xsk_umem_uses_need_wakeup); | |
101 | ||
26062b18 BT |
102 | void xp_release(struct xdp_buff_xsk *xskb) |
103 | { | |
104 | xskb->pool->free_heads[xskb->pool->free_heads_cnt++] = xskb; | |
105 | } | |
106 | ||
107 | static u64 xp_get_handle(struct xdp_buff_xsk *xskb) | |
108 | { | |
109 | u64 offset = xskb->xdp.data - xskb->xdp.data_hard_start; | |
110 | ||
111 | offset += xskb->pool->headroom; | |
112 | if (!xskb->pool->unaligned) | |
113 | return xskb->orig_addr + offset; | |
114 | return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT); | |
115 | } | |
116 | ||
2b43470a | 117 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c05cd364 | 118 | { |
2b43470a BT |
119 | struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); |
120 | u64 addr; | |
121 | int err; | |
c05cd364 | 122 | |
2b43470a BT |
123 | addr = xp_get_handle(xskb); |
124 | err = xskq_prod_reserve_desc(xs->rx, addr, len); | |
125 | if (err) { | |
126 | xs->rx_dropped++; | |
127 | return err; | |
c05cd364 KL |
128 | } |
129 | ||
2b43470a BT |
130 | xp_release(xskb); |
131 | return 0; | |
c05cd364 KL |
132 | } |
133 | ||
2b43470a | 134 | static void xsk_copy_xdp(struct xdp_buff *to, struct xdp_buff *from, u32 len) |
c497176c | 135 | { |
2b43470a | 136 | void *from_buf, *to_buf; |
18baed26 | 137 | u32 metalen; |
c497176c | 138 | |
2b43470a BT |
139 | if (unlikely(xdp_data_meta_unsupported(from))) { |
140 | from_buf = from->data; | |
141 | to_buf = to->data; | |
18baed26 BT |
142 | metalen = 0; |
143 | } else { | |
2b43470a BT |
144 | from_buf = from->data_meta; |
145 | metalen = from->data - from->data_meta; | |
146 | to_buf = to->data - metalen; | |
18baed26 BT |
147 | } |
148 | ||
2b43470a | 149 | memcpy(to_buf, from_buf, len + metalen); |
c497176c BT |
150 | } |
151 | ||
2b43470a BT |
152 | static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len, |
153 | bool explicit_free) | |
c497176c | 154 | { |
2b43470a BT |
155 | struct xdp_buff *xsk_xdp; |
156 | int err; | |
c497176c | 157 | |
2b43470a BT |
158 | if (len > xsk_umem_get_rx_frame_size(xs->umem)) { |
159 | xs->rx_dropped++; | |
160 | return -ENOSPC; | |
161 | } | |
162 | ||
163 | xsk_xdp = xsk_buff_alloc(xs->umem); | |
164 | if (!xsk_xdp) { | |
173d3adb | 165 | xs->rx_dropped++; |
2b43470a BT |
166 | return -ENOSPC; |
167 | } | |
c497176c | 168 | |
2b43470a BT |
169 | xsk_copy_xdp(xsk_xdp, xdp, len); |
170 | err = __xsk_rcv_zc(xs, xsk_xdp, len); | |
171 | if (err) { | |
172 | xsk_buff_free(xsk_xdp); | |
173 | return err; | |
174 | } | |
175 | if (explicit_free) | |
176 | xdp_return_buff(xdp); | |
177 | return 0; | |
c497176c BT |
178 | } |
179 | ||
42fddcc7 BT |
180 | static bool xsk_is_bound(struct xdp_sock *xs) |
181 | { | |
182 | if (READ_ONCE(xs->state) == XSK_BOUND) { | |
183 | /* Matches smp_wmb() in bind(). */ | |
184 | smp_rmb(); | |
185 | return true; | |
186 | } | |
187 | return false; | |
188 | } | |
189 | ||
2b43470a BT |
190 | static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, |
191 | bool explicit_free) | |
173d3adb BT |
192 | { |
193 | u32 len; | |
194 | ||
42fddcc7 BT |
195 | if (!xsk_is_bound(xs)) |
196 | return -EINVAL; | |
197 | ||
173d3adb BT |
198 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
199 | return -EINVAL; | |
200 | ||
201 | len = xdp->data_end - xdp->data; | |
202 | ||
0807892e | 203 | return xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL ? |
2b43470a BT |
204 | __xsk_rcv_zc(xs, xdp, len) : |
205 | __xsk_rcv(xs, xdp, len, explicit_free); | |
173d3adb BT |
206 | } |
207 | ||
d817991c | 208 | static void xsk_flush(struct xdp_sock *xs) |
c497176c | 209 | { |
59e35e55 | 210 | xskq_prod_submit(xs->rx); |
30744a68 | 211 | __xskq_cons_release(xs->umem->fq); |
43a825af | 212 | sock_def_readable(&xs->sk); |
c497176c BT |
213 | } |
214 | ||
215 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
216 | { | |
217 | int err; | |
218 | ||
bf0bdd13 | 219 | spin_lock_bh(&xs->rx_lock); |
2b43470a BT |
220 | err = xsk_rcv(xs, xdp, false); |
221 | xsk_flush(xs); | |
bf0bdd13 | 222 | spin_unlock_bh(&xs->rx_lock); |
c497176c BT |
223 | return err; |
224 | } | |
225 | ||
e312b9e7 | 226 | int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) |
d817991c | 227 | { |
e312b9e7 | 228 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
229 | int err; |
230 | ||
2b43470a | 231 | err = xsk_rcv(xs, xdp, true); |
d817991c BT |
232 | if (err) |
233 | return err; | |
234 | ||
235 | if (!xs->flush_node.prev) | |
236 | list_add(&xs->flush_node, flush_list); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
e312b9e7 | 241 | void __xsk_map_flush(void) |
d817991c | 242 | { |
e312b9e7 | 243 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
244 | struct xdp_sock *xs, *tmp; |
245 | ||
246 | list_for_each_entry_safe(xs, tmp, flush_list, flush_node) { | |
247 | xsk_flush(xs); | |
248 | __list_del_clearprev(&xs->flush_node); | |
249 | } | |
250 | } | |
251 | ||
ac98d8aa MK |
252 | void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) |
253 | { | |
59e35e55 | 254 | xskq_prod_submit_n(umem->cq, nb_entries); |
ac98d8aa MK |
255 | } |
256 | EXPORT_SYMBOL(xsk_umem_complete_tx); | |
257 | ||
258 | void xsk_umem_consume_tx_done(struct xdp_umem *umem) | |
259 | { | |
260 | struct xdp_sock *xs; | |
261 | ||
262 | rcu_read_lock(); | |
e4e5aefc | 263 | list_for_each_entry_rcu(xs, &umem->xsk_tx_list, list) { |
30744a68 | 264 | __xskq_cons_release(xs->tx); |
ac98d8aa MK |
265 | xs->sk.sk_write_space(&xs->sk); |
266 | } | |
267 | rcu_read_unlock(); | |
268 | } | |
269 | EXPORT_SYMBOL(xsk_umem_consume_tx_done); | |
270 | ||
4bce4e5c | 271 | bool xsk_umem_consume_tx(struct xdp_umem *umem, struct xdp_desc *desc) |
ac98d8aa | 272 | { |
ac98d8aa MK |
273 | struct xdp_sock *xs; |
274 | ||
275 | rcu_read_lock(); | |
e4e5aefc | 276 | list_for_each_entry_rcu(xs, &umem->xsk_tx_list, list) { |
c5ed924b | 277 | if (!xskq_cons_peek_desc(xs->tx, desc, umem)) |
ac98d8aa MK |
278 | continue; |
279 | ||
0a05861f | 280 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
281 | * Reserve space in the completion queue and only proceed |
282 | * if there is space in it. This avoids having to implement | |
283 | * any buffering in the Tx path. | |
284 | */ | |
59e35e55 | 285 | if (xskq_prod_reserve_addr(umem->cq, desc->addr)) |
ac98d8aa MK |
286 | goto out; |
287 | ||
c5ed924b | 288 | xskq_cons_release(xs->tx); |
ac98d8aa MK |
289 | rcu_read_unlock(); |
290 | return true; | |
291 | } | |
292 | ||
293 | out: | |
294 | rcu_read_unlock(); | |
295 | return false; | |
296 | } | |
297 | EXPORT_SYMBOL(xsk_umem_consume_tx); | |
298 | ||
06870682 | 299 | static int xsk_wakeup(struct xdp_sock *xs, u8 flags) |
ac98d8aa | 300 | { |
ac98d8aa | 301 | struct net_device *dev = xs->dev; |
06870682 MM |
302 | int err; |
303 | ||
304 | rcu_read_lock(); | |
305 | err = dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags); | |
306 | rcu_read_unlock(); | |
ac98d8aa | 307 | |
06870682 MM |
308 | return err; |
309 | } | |
310 | ||
311 | static int xsk_zc_xmit(struct xdp_sock *xs) | |
312 | { | |
313 | return xsk_wakeup(xs, XDP_WAKEUP_TX); | |
ac98d8aa MK |
314 | } |
315 | ||
35fcde7f MK |
316 | static void xsk_destruct_skb(struct sk_buff *skb) |
317 | { | |
bbff2f32 | 318 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f | 319 | struct xdp_sock *xs = xdp_sk(skb->sk); |
a9744f7c | 320 | unsigned long flags; |
35fcde7f | 321 | |
a9744f7c | 322 | spin_lock_irqsave(&xs->tx_completion_lock, flags); |
59e35e55 | 323 | xskq_prod_submit_addr(xs->umem->cq, addr); |
a9744f7c | 324 | spin_unlock_irqrestore(&xs->tx_completion_lock, flags); |
35fcde7f MK |
325 | |
326 | sock_wfree(skb); | |
327 | } | |
328 | ||
df551058 | 329 | static int xsk_generic_xmit(struct sock *sk) |
35fcde7f | 330 | { |
35fcde7f | 331 | struct xdp_sock *xs = xdp_sk(sk); |
df551058 | 332 | u32 max_batch = TX_BATCH_SIZE; |
35fcde7f MK |
333 | bool sent_frame = false; |
334 | struct xdp_desc desc; | |
335 | struct sk_buff *skb; | |
336 | int err = 0; | |
337 | ||
35fcde7f MK |
338 | mutex_lock(&xs->mutex); |
339 | ||
67571640 IM |
340 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
341 | goto out; | |
342 | ||
c5ed924b | 343 | while (xskq_cons_peek_desc(xs->tx, &desc, xs->umem)) { |
35fcde7f | 344 | char *buffer; |
bbff2f32 BT |
345 | u64 addr; |
346 | u32 len; | |
35fcde7f MK |
347 | |
348 | if (max_batch-- == 0) { | |
349 | err = -EAGAIN; | |
350 | goto out; | |
351 | } | |
352 | ||
09210c4b | 353 | len = desc.len; |
ac98d8aa | 354 | skb = sock_alloc_send_skb(sk, len, 1, &err); |
aa2cad06 | 355 | if (unlikely(!skb)) |
35fcde7f | 356 | goto out; |
35fcde7f MK |
357 | |
358 | skb_put(skb, len); | |
bbff2f32 | 359 | addr = desc.addr; |
2b43470a | 360 | buffer = xsk_buff_raw_get_data(xs->umem, addr); |
35fcde7f | 361 | err = skb_store_bits(skb, 0, buffer, len); |
0a05861f | 362 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
363 | * Reserve space in the completion queue and only proceed |
364 | * if there is space in it. This avoids having to implement | |
365 | * any buffering in the Tx path. | |
366 | */ | |
59e35e55 | 367 | if (unlikely(err) || xskq_prod_reserve(xs->umem->cq)) { |
35fcde7f MK |
368 | kfree_skb(skb); |
369 | goto out; | |
370 | } | |
371 | ||
372 | skb->dev = xs->dev; | |
373 | skb->priority = sk->sk_priority; | |
374 | skb->mark = sk->sk_mark; | |
c05cd364 | 375 | skb_shinfo(skb)->destructor_arg = (void *)(long)desc.addr; |
35fcde7f MK |
376 | skb->destructor = xsk_destruct_skb; |
377 | ||
378 | err = dev_direct_xmit(skb, xs->queue_id); | |
c5ed924b | 379 | xskq_cons_release(xs->tx); |
35fcde7f MK |
380 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
381 | if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) { | |
fe588685 MK |
382 | /* SKB completed but not sent */ |
383 | err = -EBUSY; | |
35fcde7f MK |
384 | goto out; |
385 | } | |
386 | ||
387 | sent_frame = true; | |
35fcde7f MK |
388 | } |
389 | ||
390 | out: | |
391 | if (sent_frame) | |
392 | sk->sk_write_space(sk); | |
393 | ||
394 | mutex_unlock(&xs->mutex); | |
395 | return err; | |
396 | } | |
397 | ||
df551058 MK |
398 | static int __xsk_sendmsg(struct sock *sk) |
399 | { | |
400 | struct xdp_sock *xs = xdp_sk(sk); | |
401 | ||
402 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
403 | return -ENETDOWN; | |
404 | if (unlikely(!xs->tx)) | |
405 | return -ENOBUFS; | |
406 | ||
407 | return xs->zc ? xsk_zc_xmit(xs) : xsk_generic_xmit(sk); | |
408 | } | |
409 | ||
35fcde7f MK |
410 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
411 | { | |
ac98d8aa | 412 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
413 | struct sock *sk = sock->sk; |
414 | struct xdp_sock *xs = xdp_sk(sk); | |
415 | ||
42fddcc7 | 416 | if (unlikely(!xsk_is_bound(xs))) |
35fcde7f | 417 | return -ENXIO; |
df551058 | 418 | if (unlikely(need_wait)) |
ac98d8aa | 419 | return -EOPNOTSUPP; |
35fcde7f | 420 | |
df551058 | 421 | return __xsk_sendmsg(sk); |
35fcde7f MK |
422 | } |
423 | ||
5d946c5a | 424 | static __poll_t xsk_poll(struct file *file, struct socket *sock, |
a11e1d43 | 425 | struct poll_table_struct *wait) |
c497176c | 426 | { |
5d946c5a | 427 | __poll_t mask = datagram_poll(file, sock, wait); |
df551058 MK |
428 | struct sock *sk = sock->sk; |
429 | struct xdp_sock *xs = xdp_sk(sk); | |
42fddcc7 BT |
430 | struct xdp_umem *umem; |
431 | ||
432 | if (unlikely(!xsk_is_bound(xs))) | |
433 | return mask; | |
434 | ||
42fddcc7 | 435 | umem = xs->umem; |
77cd0d7b | 436 | |
df551058 | 437 | if (umem->need_wakeup) { |
06870682 MM |
438 | if (xs->zc) |
439 | xsk_wakeup(xs, umem->need_wakeup); | |
df551058 MK |
440 | else |
441 | /* Poll needs to drive Tx also in copy mode */ | |
442 | __xsk_sendmsg(sk); | |
443 | } | |
c497176c | 444 | |
59e35e55 | 445 | if (xs->rx && !xskq_prod_is_empty(xs->rx)) |
5d946c5a | 446 | mask |= EPOLLIN | EPOLLRDNORM; |
c5ed924b | 447 | if (xs->tx && !xskq_cons_is_full(xs->tx)) |
5d946c5a | 448 | mask |= EPOLLOUT | EPOLLWRNORM; |
c497176c BT |
449 | |
450 | return mask; | |
451 | } | |
452 | ||
b9b6b68e BT |
453 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
454 | bool umem_queue) | |
423f3832 MK |
455 | { |
456 | struct xsk_queue *q; | |
457 | ||
458 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
459 | return -EINVAL; | |
460 | ||
b9b6b68e | 461 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
462 | if (!q) |
463 | return -ENOMEM; | |
464 | ||
37b07693 BT |
465 | /* Make sure queue is ready before it can be seen by others */ |
466 | smp_wmb(); | |
94a99763 | 467 | WRITE_ONCE(*queue, q); |
423f3832 MK |
468 | return 0; |
469 | } | |
470 | ||
455302d1 IM |
471 | static void xsk_unbind_dev(struct xdp_sock *xs) |
472 | { | |
473 | struct net_device *dev = xs->dev; | |
474 | ||
42fddcc7 | 475 | if (xs->state != XSK_BOUND) |
455302d1 | 476 | return; |
42fddcc7 | 477 | WRITE_ONCE(xs->state, XSK_UNBOUND); |
455302d1 IM |
478 | |
479 | /* Wait for driver to stop using the xdp socket. */ | |
480 | xdp_del_sk_umem(xs->umem, xs); | |
481 | xs->dev = NULL; | |
482 | synchronize_net(); | |
483 | dev_put(dev); | |
484 | } | |
485 | ||
0402acd6 BT |
486 | static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
487 | struct xdp_sock ***map_entry) | |
488 | { | |
489 | struct xsk_map *map = NULL; | |
490 | struct xsk_map_node *node; | |
491 | ||
492 | *map_entry = NULL; | |
493 | ||
494 | spin_lock_bh(&xs->map_list_lock); | |
495 | node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, | |
496 | node); | |
497 | if (node) { | |
498 | WARN_ON(xsk_map_inc(node->map)); | |
499 | map = node->map; | |
500 | *map_entry = node->map_entry; | |
501 | } | |
502 | spin_unlock_bh(&xs->map_list_lock); | |
503 | return map; | |
504 | } | |
505 | ||
506 | static void xsk_delete_from_maps(struct xdp_sock *xs) | |
507 | { | |
508 | /* This function removes the current XDP socket from all the | |
509 | * maps it resides in. We need to take extra care here, due to | |
510 | * the two locks involved. Each map has a lock synchronizing | |
511 | * updates to the entries, and each socket has a lock that | |
512 | * synchronizes access to the list of maps (map_list). For | |
513 | * deadlock avoidance the locks need to be taken in the order | |
514 | * "map lock"->"socket map list lock". We start off by | |
515 | * accessing the socket map list, and take a reference to the | |
516 | * map to guarantee existence between the | |
517 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete() | |
518 | * calls. Then we ask the map to remove the socket, which | |
519 | * tries to remove the socket from the map. Note that there | |
520 | * might be updates to the map between | |
521 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). | |
522 | */ | |
523 | struct xdp_sock **map_entry = NULL; | |
524 | struct xsk_map *map; | |
525 | ||
526 | while ((map = xsk_get_map_list_entry(xs, &map_entry))) { | |
527 | xsk_map_try_sock_delete(map, xs, map_entry); | |
528 | xsk_map_put(map); | |
529 | } | |
530 | } | |
531 | ||
c0c77d8f BT |
532 | static int xsk_release(struct socket *sock) |
533 | { | |
534 | struct sock *sk = sock->sk; | |
965a9909 | 535 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
536 | struct net *net; |
537 | ||
538 | if (!sk) | |
539 | return 0; | |
540 | ||
541 | net = sock_net(sk); | |
542 | ||
1d0dc069 BT |
543 | mutex_lock(&net->xdp.lock); |
544 | sk_del_node_init_rcu(sk); | |
545 | mutex_unlock(&net->xdp.lock); | |
546 | ||
c0c77d8f BT |
547 | local_bh_disable(); |
548 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
549 | local_bh_enable(); | |
550 | ||
0402acd6 | 551 | xsk_delete_from_maps(xs); |
42fddcc7 | 552 | mutex_lock(&xs->mutex); |
455302d1 | 553 | xsk_unbind_dev(xs); |
42fddcc7 | 554 | mutex_unlock(&xs->mutex); |
965a9909 | 555 | |
541d7fdd BT |
556 | xskq_destroy(xs->rx); |
557 | xskq_destroy(xs->tx); | |
558 | ||
c0c77d8f BT |
559 | sock_orphan(sk); |
560 | sock->sk = NULL; | |
561 | ||
562 | sk_refcnt_debug_release(sk); | |
563 | sock_put(sk); | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
965a9909 MK |
568 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
569 | { | |
570 | struct socket *sock; | |
571 | int err; | |
572 | ||
573 | sock = sockfd_lookup(fd, &err); | |
574 | if (!sock) | |
575 | return ERR_PTR(-ENOTSOCK); | |
576 | ||
577 | if (sock->sk->sk_family != PF_XDP) { | |
578 | sockfd_put(sock); | |
579 | return ERR_PTR(-ENOPROTOOPT); | |
580 | } | |
581 | ||
582 | return sock; | |
583 | } | |
584 | ||
585 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
586 | { | |
587 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
588 | struct sock *sk = sock->sk; | |
965a9909 | 589 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 590 | struct net_device *dev; |
173d3adb | 591 | u32 flags, qid; |
965a9909 MK |
592 | int err = 0; |
593 | ||
594 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
595 | return -EINVAL; | |
596 | if (sxdp->sxdp_family != AF_XDP) | |
597 | return -EINVAL; | |
598 | ||
f54ba391 | 599 | flags = sxdp->sxdp_flags; |
77cd0d7b MK |
600 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
601 | XDP_USE_NEED_WAKEUP)) | |
f54ba391 BT |
602 | return -EINVAL; |
603 | ||
5464c3a0 | 604 | rtnl_lock(); |
965a9909 | 605 | mutex_lock(&xs->mutex); |
455302d1 | 606 | if (xs->state != XSK_READY) { |
959b71db BT |
607 | err = -EBUSY; |
608 | goto out_release; | |
609 | } | |
610 | ||
965a9909 MK |
611 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
612 | if (!dev) { | |
613 | err = -ENODEV; | |
614 | goto out_release; | |
615 | } | |
616 | ||
f6145903 | 617 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
618 | err = -EINVAL; |
619 | goto out_unlock; | |
620 | } | |
621 | ||
173d3adb | 622 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
623 | |
624 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
625 | struct xdp_sock *umem_xs; |
626 | struct socket *sock; | |
627 | ||
77cd0d7b MK |
628 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
629 | (flags & XDP_USE_NEED_WAKEUP)) { | |
173d3adb BT |
630 | /* Cannot specify flags for shared sockets. */ |
631 | err = -EINVAL; | |
632 | goto out_unlock; | |
633 | } | |
634 | ||
965a9909 MK |
635 | if (xs->umem) { |
636 | /* We have already our own. */ | |
637 | err = -EINVAL; | |
638 | goto out_unlock; | |
639 | } | |
640 | ||
641 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
642 | if (IS_ERR(sock)) { | |
643 | err = PTR_ERR(sock); | |
644 | goto out_unlock; | |
645 | } | |
646 | ||
647 | umem_xs = xdp_sk(sock->sk); | |
42fddcc7 | 648 | if (!xsk_is_bound(umem_xs)) { |
965a9909 MK |
649 | err = -EBADF; |
650 | sockfd_put(sock); | |
651 | goto out_unlock; | |
42fddcc7 BT |
652 | } |
653 | if (umem_xs->dev != dev || umem_xs->queue_id != qid) { | |
965a9909 MK |
654 | err = -EINVAL; |
655 | sockfd_put(sock); | |
656 | goto out_unlock; | |
657 | } | |
658 | ||
659 | xdp_get_umem(umem_xs->umem); | |
9764f4b3 | 660 | WRITE_ONCE(xs->umem, umem_xs->umem); |
965a9909 MK |
661 | sockfd_put(sock); |
662 | } else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) { | |
663 | err = -EINVAL; | |
664 | goto out_unlock; | |
c497176c BT |
665 | } else { |
666 | /* This xsk has its own umem. */ | |
173d3adb BT |
667 | err = xdp_umem_assign_dev(xs->umem, dev, qid, flags); |
668 | if (err) | |
669 | goto out_unlock; | |
965a9909 MK |
670 | } |
671 | ||
965a9909 | 672 | xs->dev = dev; |
ac98d8aa MK |
673 | xs->zc = xs->umem->zc; |
674 | xs->queue_id = qid; | |
ac98d8aa | 675 | xdp_add_sk_umem(xs->umem, xs); |
965a9909 MK |
676 | |
677 | out_unlock: | |
42fddcc7 | 678 | if (err) { |
965a9909 | 679 | dev_put(dev); |
42fddcc7 BT |
680 | } else { |
681 | /* Matches smp_rmb() in bind() for shared umem | |
682 | * sockets, and xsk_is_bound(). | |
683 | */ | |
684 | smp_wmb(); | |
685 | WRITE_ONCE(xs->state, XSK_BOUND); | |
686 | } | |
965a9909 MK |
687 | out_release: |
688 | mutex_unlock(&xs->mutex); | |
5464c3a0 | 689 | rtnl_unlock(); |
965a9909 MK |
690 | return err; |
691 | } | |
692 | ||
c05cd364 KL |
693 | struct xdp_umem_reg_v1 { |
694 | __u64 addr; /* Start of packet data area */ | |
695 | __u64 len; /* Length of packet data area */ | |
696 | __u32 chunk_size; | |
697 | __u32 headroom; | |
698 | }; | |
699 | ||
c0c77d8f BT |
700 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
701 | char __user *optval, unsigned int optlen) | |
702 | { | |
703 | struct sock *sk = sock->sk; | |
704 | struct xdp_sock *xs = xdp_sk(sk); | |
705 | int err; | |
706 | ||
707 | if (level != SOL_XDP) | |
708 | return -ENOPROTOOPT; | |
709 | ||
710 | switch (optname) { | |
b9b6b68e | 711 | case XDP_RX_RING: |
f6145903 | 712 | case XDP_TX_RING: |
b9b6b68e BT |
713 | { |
714 | struct xsk_queue **q; | |
715 | int entries; | |
716 | ||
717 | if (optlen < sizeof(entries)) | |
718 | return -EINVAL; | |
719 | if (copy_from_user(&entries, optval, sizeof(entries))) | |
720 | return -EFAULT; | |
721 | ||
722 | mutex_lock(&xs->mutex); | |
455302d1 IM |
723 | if (xs->state != XSK_READY) { |
724 | mutex_unlock(&xs->mutex); | |
725 | return -EBUSY; | |
726 | } | |
f6145903 | 727 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e | 728 | err = xsk_init_queue(entries, q, false); |
77cd0d7b MK |
729 | if (!err && optname == XDP_TX_RING) |
730 | /* Tx needs to be explicitly woken up the first time */ | |
731 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
b9b6b68e BT |
732 | mutex_unlock(&xs->mutex); |
733 | return err; | |
734 | } | |
c0c77d8f BT |
735 | case XDP_UMEM_REG: |
736 | { | |
c05cd364 KL |
737 | size_t mr_size = sizeof(struct xdp_umem_reg); |
738 | struct xdp_umem_reg mr = {}; | |
c0c77d8f BT |
739 | struct xdp_umem *umem; |
740 | ||
c05cd364 KL |
741 | if (optlen < sizeof(struct xdp_umem_reg_v1)) |
742 | return -EINVAL; | |
743 | else if (optlen < sizeof(mr)) | |
744 | mr_size = sizeof(struct xdp_umem_reg_v1); | |
745 | ||
746 | if (copy_from_user(&mr, optval, mr_size)) | |
c0c77d8f BT |
747 | return -EFAULT; |
748 | ||
749 | mutex_lock(&xs->mutex); | |
455302d1 | 750 | if (xs->state != XSK_READY || xs->umem) { |
a49049ea BT |
751 | mutex_unlock(&xs->mutex); |
752 | return -EBUSY; | |
753 | } | |
c0c77d8f | 754 | |
a49049ea BT |
755 | umem = xdp_umem_create(&mr); |
756 | if (IS_ERR(umem)) { | |
c0c77d8f | 757 | mutex_unlock(&xs->mutex); |
a49049ea | 758 | return PTR_ERR(umem); |
c0c77d8f BT |
759 | } |
760 | ||
761 | /* Make sure umem is ready before it can be seen by others */ | |
762 | smp_wmb(); | |
9764f4b3 | 763 | WRITE_ONCE(xs->umem, umem); |
c0c77d8f BT |
764 | mutex_unlock(&xs->mutex); |
765 | return 0; | |
766 | } | |
423f3832 | 767 | case XDP_UMEM_FILL_RING: |
fe230832 | 768 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
769 | { |
770 | struct xsk_queue **q; | |
771 | int entries; | |
772 | ||
423f3832 MK |
773 | if (copy_from_user(&entries, optval, sizeof(entries))) |
774 | return -EFAULT; | |
775 | ||
776 | mutex_lock(&xs->mutex); | |
455302d1 IM |
777 | if (xs->state != XSK_READY) { |
778 | mutex_unlock(&xs->mutex); | |
779 | return -EBUSY; | |
780 | } | |
a49049ea BT |
781 | if (!xs->umem) { |
782 | mutex_unlock(&xs->mutex); | |
783 | return -EINVAL; | |
784 | } | |
785 | ||
fe230832 MK |
786 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq : |
787 | &xs->umem->cq; | |
b9b6b68e | 788 | err = xsk_init_queue(entries, q, true); |
2b43470a BT |
789 | if (optname == XDP_UMEM_FILL_RING) |
790 | xp_set_fq(xs->umem->pool, *q); | |
423f3832 MK |
791 | mutex_unlock(&xs->mutex); |
792 | return err; | |
793 | } | |
c0c77d8f BT |
794 | default: |
795 | break; | |
796 | } | |
797 | ||
798 | return -ENOPROTOOPT; | |
799 | } | |
800 | ||
77cd0d7b MK |
801 | static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
802 | { | |
803 | ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
804 | ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
805 | ring->desc = offsetof(struct xdp_rxtx_ring, desc); | |
806 | } | |
807 | ||
808 | static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) | |
809 | { | |
810 | ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
811 | ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
812 | ring->desc = offsetof(struct xdp_umem_ring, desc); | |
813 | } | |
814 | ||
af75d9e0 MK |
815 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
816 | char __user *optval, int __user *optlen) | |
817 | { | |
818 | struct sock *sk = sock->sk; | |
819 | struct xdp_sock *xs = xdp_sk(sk); | |
820 | int len; | |
821 | ||
822 | if (level != SOL_XDP) | |
823 | return -ENOPROTOOPT; | |
824 | ||
825 | if (get_user(len, optlen)) | |
826 | return -EFAULT; | |
827 | if (len < 0) | |
828 | return -EINVAL; | |
829 | ||
830 | switch (optname) { | |
831 | case XDP_STATISTICS: | |
832 | { | |
833 | struct xdp_statistics stats; | |
834 | ||
835 | if (len < sizeof(stats)) | |
836 | return -EINVAL; | |
837 | ||
838 | mutex_lock(&xs->mutex); | |
839 | stats.rx_dropped = xs->rx_dropped; | |
840 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); | |
841 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
842 | mutex_unlock(&xs->mutex); | |
843 | ||
844 | if (copy_to_user(optval, &stats, sizeof(stats))) | |
845 | return -EFAULT; | |
846 | if (put_user(sizeof(stats), optlen)) | |
847 | return -EFAULT; | |
848 | ||
849 | return 0; | |
850 | } | |
b3a9e0be BT |
851 | case XDP_MMAP_OFFSETS: |
852 | { | |
853 | struct xdp_mmap_offsets off; | |
77cd0d7b MK |
854 | struct xdp_mmap_offsets_v1 off_v1; |
855 | bool flags_supported = true; | |
856 | void *to_copy; | |
b3a9e0be | 857 | |
77cd0d7b | 858 | if (len < sizeof(off_v1)) |
b3a9e0be | 859 | return -EINVAL; |
77cd0d7b MK |
860 | else if (len < sizeof(off)) |
861 | flags_supported = false; | |
862 | ||
863 | if (flags_supported) { | |
864 | /* xdp_ring_offset is identical to xdp_ring_offset_v1 | |
865 | * except for the flags field added to the end. | |
866 | */ | |
867 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
868 | &off.rx); | |
869 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
870 | &off.tx); | |
871 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
872 | &off.fr); | |
873 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
874 | &off.cr); | |
875 | off.rx.flags = offsetof(struct xdp_rxtx_ring, | |
876 | ptrs.flags); | |
877 | off.tx.flags = offsetof(struct xdp_rxtx_ring, | |
878 | ptrs.flags); | |
879 | off.fr.flags = offsetof(struct xdp_umem_ring, | |
880 | ptrs.flags); | |
881 | off.cr.flags = offsetof(struct xdp_umem_ring, | |
882 | ptrs.flags); | |
883 | ||
884 | len = sizeof(off); | |
885 | to_copy = &off; | |
886 | } else { | |
887 | xsk_enter_rxtx_offsets(&off_v1.rx); | |
888 | xsk_enter_rxtx_offsets(&off_v1.tx); | |
889 | xsk_enter_umem_offsets(&off_v1.fr); | |
890 | xsk_enter_umem_offsets(&off_v1.cr); | |
891 | ||
892 | len = sizeof(off_v1); | |
893 | to_copy = &off_v1; | |
894 | } | |
b3a9e0be | 895 | |
77cd0d7b | 896 | if (copy_to_user(optval, to_copy, len)) |
b3a9e0be BT |
897 | return -EFAULT; |
898 | if (put_user(len, optlen)) | |
899 | return -EFAULT; | |
900 | ||
901 | return 0; | |
902 | } | |
2640d3c8 MM |
903 | case XDP_OPTIONS: |
904 | { | |
905 | struct xdp_options opts = {}; | |
906 | ||
907 | if (len < sizeof(opts)) | |
908 | return -EINVAL; | |
909 | ||
910 | mutex_lock(&xs->mutex); | |
911 | if (xs->zc) | |
912 | opts.flags |= XDP_OPTIONS_ZEROCOPY; | |
913 | mutex_unlock(&xs->mutex); | |
914 | ||
915 | len = sizeof(opts); | |
916 | if (copy_to_user(optval, &opts, len)) | |
917 | return -EFAULT; | |
918 | if (put_user(len, optlen)) | |
919 | return -EFAULT; | |
920 | ||
921 | return 0; | |
922 | } | |
af75d9e0 MK |
923 | default: |
924 | break; | |
925 | } | |
926 | ||
927 | return -EOPNOTSUPP; | |
928 | } | |
929 | ||
423f3832 MK |
930 | static int xsk_mmap(struct file *file, struct socket *sock, |
931 | struct vm_area_struct *vma) | |
932 | { | |
a5a16e43 | 933 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
934 | unsigned long size = vma->vm_end - vma->vm_start; |
935 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
936 | struct xsk_queue *q = NULL; | |
37b07693 | 937 | struct xdp_umem *umem; |
423f3832 MK |
938 | unsigned long pfn; |
939 | struct page *qpg; | |
940 | ||
42fddcc7 | 941 | if (READ_ONCE(xs->state) != XSK_READY) |
455302d1 IM |
942 | return -EBUSY; |
943 | ||
b9b6b68e | 944 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 945 | q = READ_ONCE(xs->rx); |
f6145903 | 946 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 947 | q = READ_ONCE(xs->tx); |
b9b6b68e | 948 | } else { |
37b07693 BT |
949 | umem = READ_ONCE(xs->umem); |
950 | if (!umem) | |
b9b6b68e | 951 | return -EINVAL; |
423f3832 | 952 | |
e6762c8b MK |
953 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
954 | smp_rmb(); | |
b9b6b68e | 955 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
37b07693 | 956 | q = READ_ONCE(umem->fq); |
fe230832 | 957 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
37b07693 | 958 | q = READ_ONCE(umem->cq); |
b9b6b68e | 959 | } |
423f3832 MK |
960 | |
961 | if (!q) | |
962 | return -EINVAL; | |
963 | ||
e6762c8b MK |
964 | /* Matches the smp_wmb() in xsk_init_queue */ |
965 | smp_rmb(); | |
423f3832 | 966 | qpg = virt_to_head_page(q->ring); |
a50b854e | 967 | if (size > page_size(qpg)) |
423f3832 MK |
968 | return -EINVAL; |
969 | ||
970 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
971 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
972 | size, vma->vm_page_prot); | |
973 | } | |
974 | ||
455302d1 IM |
975 | static int xsk_notifier(struct notifier_block *this, |
976 | unsigned long msg, void *ptr) | |
977 | { | |
978 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
979 | struct net *net = dev_net(dev); | |
980 | struct sock *sk; | |
981 | ||
982 | switch (msg) { | |
983 | case NETDEV_UNREGISTER: | |
984 | mutex_lock(&net->xdp.lock); | |
985 | sk_for_each(sk, &net->xdp.list) { | |
986 | struct xdp_sock *xs = xdp_sk(sk); | |
987 | ||
988 | mutex_lock(&xs->mutex); | |
989 | if (xs->dev == dev) { | |
990 | sk->sk_err = ENETDOWN; | |
991 | if (!sock_flag(sk, SOCK_DEAD)) | |
992 | sk->sk_error_report(sk); | |
993 | ||
994 | xsk_unbind_dev(xs); | |
995 | ||
996 | /* Clear device references in umem. */ | |
997 | xdp_umem_clear_dev(xs->umem); | |
998 | } | |
999 | mutex_unlock(&xs->mutex); | |
1000 | } | |
1001 | mutex_unlock(&net->xdp.lock); | |
1002 | break; | |
1003 | } | |
1004 | return NOTIFY_DONE; | |
1005 | } | |
1006 | ||
c0c77d8f BT |
1007 | static struct proto xsk_proto = { |
1008 | .name = "XDP", | |
1009 | .owner = THIS_MODULE, | |
1010 | .obj_size = sizeof(struct xdp_sock), | |
1011 | }; | |
1012 | ||
1013 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
1014 | .family = PF_XDP, |
1015 | .owner = THIS_MODULE, | |
1016 | .release = xsk_release, | |
1017 | .bind = xsk_bind, | |
1018 | .connect = sock_no_connect, | |
1019 | .socketpair = sock_no_socketpair, | |
1020 | .accept = sock_no_accept, | |
1021 | .getname = sock_no_getname, | |
a11e1d43 | 1022 | .poll = xsk_poll, |
c2f4374b BT |
1023 | .ioctl = sock_no_ioctl, |
1024 | .listen = sock_no_listen, | |
1025 | .shutdown = sock_no_shutdown, | |
1026 | .setsockopt = xsk_setsockopt, | |
1027 | .getsockopt = xsk_getsockopt, | |
1028 | .sendmsg = xsk_sendmsg, | |
1029 | .recvmsg = sock_no_recvmsg, | |
1030 | .mmap = xsk_mmap, | |
1031 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
1032 | }; |
1033 | ||
11fe9262 BT |
1034 | static void xsk_destruct(struct sock *sk) |
1035 | { | |
1036 | struct xdp_sock *xs = xdp_sk(sk); | |
1037 | ||
1038 | if (!sock_flag(sk, SOCK_DEAD)) | |
1039 | return; | |
1040 | ||
1041 | xdp_put_umem(xs->umem); | |
1042 | ||
1043 | sk_refcnt_debug_dec(sk); | |
1044 | } | |
1045 | ||
c0c77d8f BT |
1046 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
1047 | int kern) | |
1048 | { | |
1049 | struct sock *sk; | |
1050 | struct xdp_sock *xs; | |
1051 | ||
1052 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
1053 | return -EPERM; | |
1054 | if (sock->type != SOCK_RAW) | |
1055 | return -ESOCKTNOSUPPORT; | |
1056 | ||
1057 | if (protocol) | |
1058 | return -EPROTONOSUPPORT; | |
1059 | ||
1060 | sock->state = SS_UNCONNECTED; | |
1061 | ||
1062 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
1063 | if (!sk) | |
1064 | return -ENOBUFS; | |
1065 | ||
1066 | sock->ops = &xsk_proto_ops; | |
1067 | ||
1068 | sock_init_data(sock, sk); | |
1069 | ||
1070 | sk->sk_family = PF_XDP; | |
1071 | ||
11fe9262 BT |
1072 | sk->sk_destruct = xsk_destruct; |
1073 | sk_refcnt_debug_inc(sk); | |
1074 | ||
cee27167 BT |
1075 | sock_set_flag(sk, SOCK_RCU_FREE); |
1076 | ||
c0c77d8f | 1077 | xs = xdp_sk(sk); |
455302d1 | 1078 | xs->state = XSK_READY; |
c0c77d8f | 1079 | mutex_init(&xs->mutex); |
bf0bdd13 | 1080 | spin_lock_init(&xs->rx_lock); |
a9744f7c | 1081 | spin_lock_init(&xs->tx_completion_lock); |
c0c77d8f | 1082 | |
0402acd6 BT |
1083 | INIT_LIST_HEAD(&xs->map_list); |
1084 | spin_lock_init(&xs->map_list_lock); | |
1085 | ||
1d0dc069 BT |
1086 | mutex_lock(&net->xdp.lock); |
1087 | sk_add_node_rcu(sk, &net->xdp.list); | |
1088 | mutex_unlock(&net->xdp.lock); | |
1089 | ||
c0c77d8f BT |
1090 | local_bh_disable(); |
1091 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
1092 | local_bh_enable(); | |
1093 | ||
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | static const struct net_proto_family xsk_family_ops = { | |
1098 | .family = PF_XDP, | |
1099 | .create = xsk_create, | |
1100 | .owner = THIS_MODULE, | |
1101 | }; | |
1102 | ||
455302d1 IM |
1103 | static struct notifier_block xsk_netdev_notifier = { |
1104 | .notifier_call = xsk_notifier, | |
1105 | }; | |
1106 | ||
1d0dc069 BT |
1107 | static int __net_init xsk_net_init(struct net *net) |
1108 | { | |
1109 | mutex_init(&net->xdp.lock); | |
1110 | INIT_HLIST_HEAD(&net->xdp.list); | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | static void __net_exit xsk_net_exit(struct net *net) | |
1115 | { | |
1116 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
1117 | } | |
1118 | ||
1119 | static struct pernet_operations xsk_net_ops = { | |
1120 | .init = xsk_net_init, | |
1121 | .exit = xsk_net_exit, | |
1122 | }; | |
1123 | ||
c0c77d8f BT |
1124 | static int __init xsk_init(void) |
1125 | { | |
e312b9e7 | 1126 | int err, cpu; |
c0c77d8f BT |
1127 | |
1128 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
1129 | if (err) | |
1130 | goto out; | |
1131 | ||
1132 | err = sock_register(&xsk_family_ops); | |
1133 | if (err) | |
1134 | goto out_proto; | |
1135 | ||
1d0dc069 BT |
1136 | err = register_pernet_subsys(&xsk_net_ops); |
1137 | if (err) | |
1138 | goto out_sk; | |
455302d1 IM |
1139 | |
1140 | err = register_netdevice_notifier(&xsk_netdev_notifier); | |
1141 | if (err) | |
1142 | goto out_pernet; | |
1143 | ||
e312b9e7 BT |
1144 | for_each_possible_cpu(cpu) |
1145 | INIT_LIST_HEAD(&per_cpu(xskmap_flush_list, cpu)); | |
c0c77d8f BT |
1146 | return 0; |
1147 | ||
455302d1 IM |
1148 | out_pernet: |
1149 | unregister_pernet_subsys(&xsk_net_ops); | |
1d0dc069 BT |
1150 | out_sk: |
1151 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
1152 | out_proto: |
1153 | proto_unregister(&xsk_proto); | |
1154 | out: | |
1155 | return err; | |
1156 | } | |
1157 | ||
1158 | fs_initcall(xsk_init); |