Commit | Line | Data |
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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
bd238fb4 | 2 | /* |
bd238fb4 LI |
3 | * Fd transport layer. Includes deprecated socket layer. |
4 | * | |
5 | * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> | |
6 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> | |
8a0dc95f | 7 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 | 8 | * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
bd238fb4 LI |
9 | */ |
10 | ||
5d385153 JP |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
bd238fb4 LI |
13 | #include <linux/in.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/net.h> | |
16 | #include <linux/ipv6.h> | |
8a0dc95f | 17 | #include <linux/kthread.h> |
bd238fb4 LI |
18 | #include <linux/errno.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/un.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/inet.h> | |
bd238fb4 | 23 | #include <linux/file.h> |
a80d923e | 24 | #include <linux/parser.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
c4fac910 | 26 | #include <linux/seq_file.h> |
bd238fb4 | 27 | #include <net/9p/9p.h> |
8b81ef58 | 28 | #include <net/9p/client.h> |
bd238fb4 LI |
29 | #include <net/9p/transport.h> |
30 | ||
6b18662e AV |
31 | #include <linux/syscalls.h> /* killme */ |
32 | ||
bd238fb4 | 33 | #define P9_PORT 564 |
22bb3b79 | 34 | #define MAX_SOCK_BUF (1024*1024) |
8a0dc95f | 35 | #define MAXPOLLWADDR 2 |
a80d923e | 36 | |
c4fac910 DH |
37 | static struct p9_trans_module p9_tcp_trans; |
38 | static struct p9_trans_module p9_fd_trans; | |
39 | ||
ee443996 EVH |
40 | /** |
41 | * struct p9_fd_opts - per-transport options | |
42 | * @rfd: file descriptor for reading (trans=fd) | |
43 | * @wfd: file descriptor for writing (trans=fd) | |
44 | * @port: port to connect to (trans=tcp) | |
760b3d61 | 45 | * @privport: port is privileged |
ee443996 EVH |
46 | */ |
47 | ||
a80d923e EVH |
48 | struct p9_fd_opts { |
49 | int rfd; | |
50 | int wfd; | |
51 | u16 port; | |
c4fac910 | 52 | bool privport; |
a80d923e | 53 | }; |
bd238fb4 | 54 | |
a80d923e EVH |
55 | /* |
56 | * Option Parsing (code inspired by NFS code) | |
57 | * - a little lazy - parse all fd-transport options | |
58 | */ | |
bd238fb4 | 59 | |
a80d923e EVH |
60 | enum { |
61 | /* Options that take integer arguments */ | |
55762690 | 62 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
2f28c8b3 JG |
63 | /* Options that take no arguments */ |
64 | Opt_privport, | |
a80d923e | 65 | }; |
bd238fb4 | 66 | |
a447c093 | 67 | static const match_table_t tokens = { |
a80d923e EVH |
68 | {Opt_port, "port=%u"}, |
69 | {Opt_rfdno, "rfdno=%u"}, | |
70 | {Opt_wfdno, "wfdno=%u"}, | |
2f28c8b3 | 71 | {Opt_privport, "privport"}, |
55762690 | 72 | {Opt_err, NULL}, |
a80d923e | 73 | }; |
bd238fb4 | 74 | |
8a0dc95f EVH |
75 | enum { |
76 | Rworksched = 1, /* read work scheduled or running */ | |
77 | Rpending = 2, /* can read */ | |
78 | Wworksched = 4, /* write work scheduled or running */ | |
79 | Wpending = 8, /* can write */ | |
80 | }; | |
81 | ||
992b3f1d TH |
82 | struct p9_poll_wait { |
83 | struct p9_conn *conn; | |
ac6424b9 | 84 | wait_queue_entry_t wait; |
992b3f1d | 85 | wait_queue_head_t *wait_addr; |
ee443996 EVH |
86 | }; |
87 | ||
88 | /** | |
89 | * struct p9_conn - fd mux connection state information | |
ee443996 | 90 | * @mux_list: list link for mux to manage multiple connections (?) |
8b81ef58 | 91 | * @client: reference to client instance for this connection |
ee443996 | 92 | * @err: error state |
296ab4a8 | 93 | * @req_lock: lock protecting req_list and requests statuses |
ee443996 EVH |
94 | * @req_list: accounting for requests which have been sent |
95 | * @unsent_req_list: accounting for requests that haven't been sent | |
760b3d61 AL |
96 | * @rreq: read request |
97 | * @wreq: write request | |
1b0a763b EVH |
98 | * @req: current request being processed (if any) |
99 | * @tmp_buf: temporary buffer to read in header | |
947867aa | 100 | * @rc: temporary fcall for reading current frame |
ee443996 EVH |
101 | * @wpos: write position for current frame |
102 | * @wsize: amount of data to write for current frame | |
103 | * @wbuf: current write buffer | |
0e15597e | 104 | * @poll_pending_link: pending links to be polled per conn |
ee443996 | 105 | * @poll_wait: array of wait_q's for various worker threads |
ee443996 EVH |
106 | * @pt: poll state |
107 | * @rq: current read work | |
108 | * @wq: current write work | |
109 | * @wsched: ???? | |
110 | * | |
111 | */ | |
8a0dc95f EVH |
112 | |
113 | struct p9_conn { | |
8a0dc95f | 114 | struct list_head mux_list; |
8b81ef58 | 115 | struct p9_client *client; |
8a0dc95f | 116 | int err; |
296ab4a8 | 117 | spinlock_t req_lock; |
8a0dc95f EVH |
118 | struct list_head req_list; |
119 | struct list_head unsent_req_list; | |
6d35190f | 120 | struct p9_req_t *rreq; |
728356de | 121 | struct p9_req_t *wreq; |
6854fadb | 122 | char tmp_buf[P9_HDRSZ]; |
947867aa | 123 | struct p9_fcall rc; |
8a0dc95f EVH |
124 | int wpos; |
125 | int wsize; | |
126 | char *wbuf; | |
992b3f1d TH |
127 | struct list_head poll_pending_link; |
128 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
129 | poll_table pt; |
130 | struct work_struct rq; | |
131 | struct work_struct wq; | |
132 | unsigned long wsched; | |
133 | }; | |
134 | ||
263c5828 SD |
135 | /** |
136 | * struct p9_trans_fd - transport state | |
137 | * @rd: reference to file to read from | |
138 | * @wr: reference of file to write to | |
139 | * @conn: connection state reference | |
140 | * | |
141 | */ | |
142 | ||
143 | struct p9_trans_fd { | |
144 | struct file *rd; | |
145 | struct file *wr; | |
146 | struct p9_conn conn; | |
147 | }; | |
148 | ||
aa70c585 TH |
149 | static void p9_poll_workfn(struct work_struct *work); |
150 | ||
992b3f1d TH |
151 | static DEFINE_SPINLOCK(p9_poll_lock); |
152 | static LIST_HEAD(p9_poll_pending_list); | |
aa70c585 | 153 | static DECLARE_WORK(p9_poll_work, p9_poll_workfn); |
8a0dc95f | 154 | |
2f28c8b3 JG |
155 | static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT; |
156 | static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT; | |
157 | ||
992b3f1d | 158 | static void p9_mux_poll_stop(struct p9_conn *m) |
8a0dc95f | 159 | { |
992b3f1d TH |
160 | unsigned long flags; |
161 | int i; | |
8a0dc95f | 162 | |
992b3f1d TH |
163 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
164 | struct p9_poll_wait *pwait = &m->poll_wait[i]; | |
8a0dc95f | 165 | |
992b3f1d TH |
166 | if (pwait->wait_addr) { |
167 | remove_wait_queue(pwait->wait_addr, &pwait->wait); | |
168 | pwait->wait_addr = NULL; | |
8a0dc95f | 169 | } |
8a0dc95f EVH |
170 | } |
171 | ||
992b3f1d TH |
172 | spin_lock_irqsave(&p9_poll_lock, flags); |
173 | list_del_init(&m->poll_pending_link); | |
174 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
430ac66e TB |
175 | |
176 | flush_work(&p9_poll_work); | |
8a0dc95f EVH |
177 | } |
178 | ||
179 | /** | |
5503ac56 EVH |
180 | * p9_conn_cancel - cancel all pending requests with error |
181 | * @m: mux data | |
182 | * @err: error code | |
8a0dc95f | 183 | * |
8a0dc95f | 184 | */ |
ee443996 | 185 | |
51a87c55 | 186 | static void p9_conn_cancel(struct p9_conn *m, int err) |
8a0dc95f | 187 | { |
673d62cd | 188 | struct p9_req_t *req, *rtmp; |
5503ac56 | 189 | LIST_HEAD(cancel_list); |
8a0dc95f | 190 | |
5d385153 | 191 | p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
7eb923b8 | 192 | |
296ab4a8 | 193 | spin_lock(&m->req_lock); |
7eb923b8 EVH |
194 | |
195 | if (m->err) { | |
296ab4a8 | 196 | spin_unlock(&m->req_lock); |
7eb923b8 EVH |
197 | return; |
198 | } | |
199 | ||
200 | m->err = err; | |
201 | ||
5503ac56 EVH |
202 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
203 | list_move(&req->req_list, &cancel_list); | |
1a4f69ef | 204 | WRITE_ONCE(req->status, REQ_STATUS_ERROR); |
5503ac56 EVH |
205 | } |
206 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
207 | list_move(&req->req_list, &cancel_list); | |
1a4f69ef | 208 | WRITE_ONCE(req->status, REQ_STATUS_ERROR); |
8a0dc95f EVH |
209 | } |
210 | ||
296ab4a8 | 211 | spin_unlock(&m->req_lock); |
52f1c45d | 212 | |
5503ac56 | 213 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
5d385153 | 214 | p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); |
1bab88b2 | 215 | list_del(&req->req_list); |
2b6e72ed DM |
216 | if (!req->t_err) |
217 | req->t_err = err; | |
218 | p9_client_cb(m->client, req, REQ_STATUS_ERROR); | |
8a0dc95f | 219 | } |
8a0dc95f EVH |
220 | } |
221 | ||
7594bf37 AV |
222 | static __poll_t |
223 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err) | |
8a0dc95f | 224 | { |
9965ed17 | 225 | __poll_t ret; |
5503ac56 | 226 | struct p9_trans_fd *ts = NULL; |
8a0dc95f | 227 | |
5503ac56 EVH |
228 | if (client && client->status == Connected) |
229 | ts = client->trans; | |
7dc5d24b | 230 | |
7594bf37 AV |
231 | if (!ts) { |
232 | if (err) | |
233 | *err = -EREMOTEIO; | |
a9a08845 | 234 | return EPOLLERR; |
7594bf37 | 235 | } |
7dc5d24b | 236 | |
9965ed17 CH |
237 | ret = vfs_poll(ts->rd, pt); |
238 | if (ts->rd != ts->wr) | |
239 | ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN); | |
5503ac56 | 240 | return ret; |
992b3f1d TH |
241 | } |
242 | ||
8a0dc95f | 243 | /** |
5503ac56 EVH |
244 | * p9_fd_read- read from a fd |
245 | * @client: client instance | |
246 | * @v: buffer to receive data into | |
247 | * @len: size of receive buffer | |
ee443996 | 248 | * |
8a0dc95f | 249 | */ |
ee443996 | 250 | |
5503ac56 | 251 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
8a0dc95f | 252 | { |
5503ac56 EVH |
253 | int ret; |
254 | struct p9_trans_fd *ts = NULL; | |
bdd1d2d3 | 255 | loff_t pos; |
8a0dc95f | 256 | |
5503ac56 EVH |
257 | if (client && client->status != Disconnected) |
258 | ts = client->trans; | |
8a0dc95f | 259 | |
5503ac56 EVH |
260 | if (!ts) |
261 | return -EREMOTEIO; | |
8a0dc95f | 262 | |
5503ac56 | 263 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
5d385153 | 264 | p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); |
8a0dc95f | 265 | |
bdd1d2d3 CH |
266 | pos = ts->rd->f_pos; |
267 | ret = kernel_read(ts->rd, v, len, &pos); | |
5503ac56 EVH |
268 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
269 | client->status = Disconnected; | |
270 | return ret; | |
8a0dc95f EVH |
271 | } |
272 | ||
273 | /** | |
5503ac56 EVH |
274 | * p9_read_work - called when there is some data to be read from a transport |
275 | * @work: container of work to be done | |
ee443996 | 276 | * |
8a0dc95f | 277 | */ |
ee443996 | 278 | |
5503ac56 | 279 | static void p9_read_work(struct work_struct *work) |
8a0dc95f | 280 | { |
7594bf37 AV |
281 | __poll_t n; |
282 | int err; | |
5503ac56 | 283 | struct p9_conn *m; |
5503ac56 EVH |
284 | |
285 | m = container_of(work, struct p9_conn, rq); | |
8a0dc95f EVH |
286 | |
287 | if (m->err < 0) | |
288 | return; | |
289 | ||
947867aa | 290 | p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset); |
8a0dc95f | 291 | |
947867aa DM |
292 | if (!m->rc.sdata) { |
293 | m->rc.sdata = m->tmp_buf; | |
294 | m->rc.offset = 0; | |
6854fadb | 295 | m->rc.capacity = P9_HDRSZ; /* start by reading header */ |
8a0dc95f EVH |
296 | } |
297 | ||
5503ac56 | 298 | clear_bit(Rpending, &m->wsched); |
947867aa DM |
299 | p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n", |
300 | m, m->rc.offset, m->rc.capacity, | |
301 | m->rc.capacity - m->rc.offset); | |
302 | err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset, | |
303 | m->rc.capacity - m->rc.offset); | |
5d385153 | 304 | p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
947867aa | 305 | if (err == -EAGAIN) |
0462194d | 306 | goto end_clear; |
8a0dc95f | 307 | |
5503ac56 EVH |
308 | if (err <= 0) |
309 | goto error; | |
310 | ||
947867aa | 311 | m->rc.offset += err; |
1b0a763b | 312 | |
947867aa | 313 | /* header read in */ |
6d35190f | 314 | if ((!m->rreq) && (m->rc.offset == m->rc.capacity)) { |
5d385153 | 315 | p9_debug(P9_DEBUG_TRANS, "got new header\n"); |
1b0a763b | 316 | |
f984579a | 317 | /* Header size */ |
6854fadb | 318 | m->rc.size = P9_HDRSZ; |
f984579a | 319 | err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0); |
947867aa DM |
320 | if (err) { |
321 | p9_debug(P9_DEBUG_ERROR, | |
322 | "error parsing header: %d\n", err); | |
323 | goto error; | |
324 | } | |
325 | ||
5d385153 | 326 | p9_debug(P9_DEBUG_TRANS, |
947867aa DM |
327 | "mux %p pkt: size: %d bytes tag: %d\n", |
328 | m, m->rc.size, m->rc.tag); | |
1b0a763b | 329 | |
6d35190f TB |
330 | m->rreq = p9_tag_lookup(m->client, m->rc.tag); |
331 | if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) { | |
5d385153 | 332 | p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
947867aa | 333 | m->rc.tag); |
1b0a763b EVH |
334 | err = -EIO; |
335 | goto error; | |
336 | } | |
337 | ||
578b565b GZ |
338 | if (m->rc.size > m->rreq->rc.capacity) { |
339 | p9_debug(P9_DEBUG_ERROR, | |
340 | "requested packet size too big: %d for tag %d with capacity %zd\n", | |
341 | m->rc.size, m->rc.tag, m->rreq->rc.capacity); | |
342 | err = -EIO; | |
343 | goto error; | |
344 | } | |
345 | ||
6d35190f | 346 | if (!m->rreq->rc.sdata) { |
3053600e DM |
347 | p9_debug(P9_DEBUG_ERROR, |
348 | "No recv fcall for tag %d (req %p), disconnecting!\n", | |
6d35190f | 349 | m->rc.tag, m->rreq); |
4ac7573e | 350 | p9_req_put(m->client, m->rreq); |
6d35190f | 351 | m->rreq = NULL; |
3053600e DM |
352 | err = -EIO; |
353 | goto error; | |
1b0a763b | 354 | } |
6d35190f | 355 | m->rc.sdata = m->rreq->rc.sdata; |
947867aa DM |
356 | memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity); |
357 | m->rc.capacity = m->rc.size; | |
1b0a763b | 358 | } |
5503ac56 | 359 | |
947867aa DM |
360 | /* packet is read in |
361 | * not an else because some packets (like clunk) have no payload | |
362 | */ | |
6d35190f | 363 | if ((m->rreq) && (m->rc.offset == m->rc.capacity)) { |
5d385153 | 364 | p9_debug(P9_DEBUG_TRANS, "got new packet\n"); |
6d35190f | 365 | m->rreq->rc.size = m->rc.offset; |
296ab4a8 | 366 | spin_lock(&m->req_lock); |
e4ca13f7 DM |
367 | if (m->rreq->status == REQ_STATUS_SENT) { |
368 | list_del(&m->rreq->req_list); | |
369 | p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD); | |
74d6a5d5 WH |
370 | } else if (m->rreq->status == REQ_STATUS_FLSHD) { |
371 | /* Ignore replies associated with a cancelled request. */ | |
372 | p9_debug(P9_DEBUG_TRANS, | |
373 | "Ignore replies associated with a cancelled request\n"); | |
e4ca13f7 | 374 | } else { |
296ab4a8 | 375 | spin_unlock(&m->req_lock); |
e4ca13f7 DM |
376 | p9_debug(P9_DEBUG_ERROR, |
377 | "Request tag %d errored out while we were reading the reply\n", | |
378 | m->rc.tag); | |
379 | err = -EIO; | |
380 | goto error; | |
381 | } | |
296ab4a8 | 382 | spin_unlock(&m->req_lock); |
947867aa DM |
383 | m->rc.sdata = NULL; |
384 | m->rc.offset = 0; | |
385 | m->rc.capacity = 0; | |
8b11ff09 | 386 | p9_req_put(m->client, m->rreq); |
6d35190f | 387 | m->rreq = NULL; |
5503ac56 EVH |
388 | } |
389 | ||
0462194d SD |
390 | end_clear: |
391 | clear_bit(Rworksched, &m->wsched); | |
392 | ||
5503ac56 EVH |
393 | if (!list_empty(&m->req_list)) { |
394 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
a9a08845 | 395 | n = EPOLLIN; |
5503ac56 | 396 | else |
7594bf37 | 397 | n = p9_fd_poll(m->client, NULL, NULL); |
5503ac56 | 398 | |
a9a08845 | 399 | if ((n & EPOLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 400 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 401 | schedule_work(&m->rq); |
0462194d SD |
402 | } |
403 | } | |
5503ac56 EVH |
404 | |
405 | return; | |
5503ac56 EVH |
406 | error: |
407 | p9_conn_cancel(m, err); | |
408 | clear_bit(Rworksched, &m->wsched); | |
409 | } | |
410 | ||
411 | /** | |
412 | * p9_fd_write - write to a socket | |
413 | * @client: client instance | |
414 | * @v: buffer to send data from | |
415 | * @len: size of send buffer | |
ee443996 | 416 | * |
8a0dc95f | 417 | */ |
ee443996 | 418 | |
5503ac56 | 419 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
8a0dc95f | 420 | { |
670986ec | 421 | ssize_t ret; |
5503ac56 | 422 | struct p9_trans_fd *ts = NULL; |
8a0dc95f | 423 | |
5503ac56 EVH |
424 | if (client && client->status != Disconnected) |
425 | ts = client->trans; | |
8a0dc95f | 426 | |
5503ac56 EVH |
427 | if (!ts) |
428 | return -EREMOTEIO; | |
8a0dc95f | 429 | |
5503ac56 | 430 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
5d385153 | 431 | p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); |
992b3f1d | 432 | |
670986ec | 433 | ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos); |
5503ac56 EVH |
434 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
435 | client->status = Disconnected; | |
436 | return ret; | |
8a0dc95f EVH |
437 | } |
438 | ||
439 | /** | |
440 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
441 | * @work: container for work to be done |
442 | * | |
8a0dc95f | 443 | */ |
ee443996 | 444 | |
8a0dc95f EVH |
445 | static void p9_write_work(struct work_struct *work) |
446 | { | |
7594bf37 AV |
447 | __poll_t n; |
448 | int err; | |
8a0dc95f | 449 | struct p9_conn *m; |
673d62cd | 450 | struct p9_req_t *req; |
8a0dc95f EVH |
451 | |
452 | m = container_of(work, struct p9_conn, wq); | |
453 | ||
454 | if (m->err < 0) { | |
455 | clear_bit(Wworksched, &m->wsched); | |
456 | return; | |
457 | } | |
458 | ||
459 | if (!m->wsize) { | |
296ab4a8 | 460 | spin_lock(&m->req_lock); |
8a0dc95f EVH |
461 | if (list_empty(&m->unsent_req_list)) { |
462 | clear_bit(Wworksched, &m->wsched); | |
296ab4a8 | 463 | spin_unlock(&m->req_lock); |
8a0dc95f EVH |
464 | return; |
465 | } | |
466 | ||
673d62cd | 467 | req = list_entry(m->unsent_req_list.next, struct p9_req_t, |
8a0dc95f | 468 | req_list); |
1a4f69ef | 469 | WRITE_ONCE(req->status, REQ_STATUS_SENT); |
5d385153 | 470 | p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); |
8a0dc95f | 471 | list_move_tail(&req->req_list, &m->req_list); |
8a0dc95f | 472 | |
523adb6c DM |
473 | m->wbuf = req->tc.sdata; |
474 | m->wsize = req->tc.size; | |
8a0dc95f | 475 | m->wpos = 0; |
728356de TB |
476 | p9_req_get(req); |
477 | m->wreq = req; | |
296ab4a8 | 478 | spin_unlock(&m->req_lock); |
8a0dc95f EVH |
479 | } |
480 | ||
5d385153 JP |
481 | p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", |
482 | m, m->wpos, m->wsize); | |
8a0dc95f | 483 | clear_bit(Wpending, &m->wsched); |
8b81ef58 | 484 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
5d385153 | 485 | p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); |
584a8c13 SD |
486 | if (err == -EAGAIN) |
487 | goto end_clear; | |
488 | ||
8a0dc95f EVH |
489 | |
490 | if (err < 0) | |
491 | goto error; | |
492 | else if (err == 0) { | |
493 | err = -EREMOTEIO; | |
494 | goto error; | |
495 | } | |
496 | ||
497 | m->wpos += err; | |
728356de | 498 | if (m->wpos == m->wsize) { |
8a0dc95f | 499 | m->wpos = m->wsize = 0; |
8b11ff09 | 500 | p9_req_put(m->client, m->wreq); |
728356de TB |
501 | m->wreq = NULL; |
502 | } | |
8a0dc95f | 503 | |
584a8c13 SD |
504 | end_clear: |
505 | clear_bit(Wworksched, &m->wsched); | |
506 | ||
1957b3a8 | 507 | if (m->wsize || !list_empty(&m->unsent_req_list)) { |
8a0dc95f | 508 | if (test_and_clear_bit(Wpending, &m->wsched)) |
a9a08845 | 509 | n = EPOLLOUT; |
8a0dc95f | 510 | else |
7594bf37 | 511 | n = p9_fd_poll(m->client, NULL, NULL); |
8a0dc95f | 512 | |
a9a08845 | 513 | if ((n & EPOLLOUT) && |
584a8c13 | 514 | !test_and_set_bit(Wworksched, &m->wsched)) { |
5d385153 | 515 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
61edeeed | 516 | schedule_work(&m->wq); |
584a8c13 SD |
517 | } |
518 | } | |
8a0dc95f EVH |
519 | |
520 | return; | |
521 | ||
522 | error: | |
523 | p9_conn_cancel(m, err); | |
524 | clear_bit(Wworksched, &m->wsched); | |
525 | } | |
526 | ||
ac6424b9 | 527 | static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key) |
8a0dc95f | 528 | { |
5503ac56 EVH |
529 | struct p9_poll_wait *pwait = |
530 | container_of(wait, struct p9_poll_wait, wait); | |
531 | struct p9_conn *m = pwait->conn; | |
532 | unsigned long flags; | |
8a0dc95f | 533 | |
5503ac56 EVH |
534 | spin_lock_irqsave(&p9_poll_lock, flags); |
535 | if (list_empty(&m->poll_pending_link)) | |
536 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); | |
537 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f | 538 | |
aa70c585 TH |
539 | schedule_work(&p9_poll_work); |
540 | return 1; | |
8a0dc95f EVH |
541 | } |
542 | ||
543 | /** | |
5503ac56 EVH |
544 | * p9_pollwait - add poll task to the wait queue |
545 | * @filp: file pointer being polled | |
546 | * @wait_address: wait_q to block on | |
547 | * @p: poll state | |
ee443996 | 548 | * |
5503ac56 | 549 | * called by files poll operation to add v9fs-poll task to files wait queue |
8a0dc95f | 550 | */ |
ee443996 | 551 | |
5503ac56 EVH |
552 | static void |
553 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
8a0dc95f | 554 | { |
5503ac56 EVH |
555 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
556 | struct p9_poll_wait *pwait = NULL; | |
557 | int i; | |
8a0dc95f | 558 | |
5503ac56 EVH |
559 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
560 | if (m->poll_wait[i].wait_addr == NULL) { | |
561 | pwait = &m->poll_wait[i]; | |
562 | break; | |
8a0dc95f | 563 | } |
8a0dc95f EVH |
564 | } |
565 | ||
5503ac56 | 566 | if (!pwait) { |
5d385153 | 567 | p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
8a0dc95f EVH |
568 | return; |
569 | } | |
570 | ||
5503ac56 EVH |
571 | pwait->conn = m; |
572 | pwait->wait_addr = wait_address; | |
573 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); | |
574 | add_wait_queue(wait_address, &pwait->wait); | |
575 | } | |
8a0dc95f | 576 | |
5503ac56 | 577 | /** |
263c5828 | 578 | * p9_conn_create - initialize the per-session mux data |
5503ac56 EVH |
579 | * @client: client instance |
580 | * | |
581 | * Note: Creates the polling task if this is the first session. | |
582 | */ | |
8a0dc95f | 583 | |
263c5828 | 584 | static void p9_conn_create(struct p9_client *client) |
5503ac56 | 585 | { |
7594bf37 | 586 | __poll_t n; |
263c5828 SD |
587 | struct p9_trans_fd *ts = client->trans; |
588 | struct p9_conn *m = &ts->conn; | |
8a0dc95f | 589 | |
5d385153 | 590 | p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); |
8a0dc95f | 591 | |
5503ac56 EVH |
592 | INIT_LIST_HEAD(&m->mux_list); |
593 | m->client = client; | |
8a0dc95f | 594 | |
296ab4a8 | 595 | spin_lock_init(&m->req_lock); |
5503ac56 EVH |
596 | INIT_LIST_HEAD(&m->req_list); |
597 | INIT_LIST_HEAD(&m->unsent_req_list); | |
598 | INIT_WORK(&m->rq, p9_read_work); | |
599 | INIT_WORK(&m->wq, p9_write_work); | |
600 | INIT_LIST_HEAD(&m->poll_pending_link); | |
601 | init_poll_funcptr(&m->pt, p9_pollwait); | |
8a0dc95f | 602 | |
7594bf37 | 603 | n = p9_fd_poll(client, &m->pt, NULL); |
a9a08845 | 604 | if (n & EPOLLIN) { |
5d385153 | 605 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 EVH |
606 | set_bit(Rpending, &m->wsched); |
607 | } | |
8a0dc95f | 608 | |
a9a08845 | 609 | if (n & EPOLLOUT) { |
5d385153 | 610 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
5503ac56 EVH |
611 | set_bit(Wpending, &m->wsched); |
612 | } | |
5503ac56 | 613 | } |
8a0dc95f | 614 | |
5503ac56 EVH |
615 | /** |
616 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
617 | * @m: connection to poll | |
618 | * | |
619 | */ | |
620 | ||
621 | static void p9_poll_mux(struct p9_conn *m) | |
622 | { | |
7594bf37 AV |
623 | __poll_t n; |
624 | int err = -ECONNRESET; | |
5503ac56 EVH |
625 | |
626 | if (m->err < 0) | |
627 | return; | |
628 | ||
7594bf37 | 629 | n = p9_fd_poll(m->client, NULL, &err); |
a9a08845 | 630 | if (n & (EPOLLERR | EPOLLHUP | EPOLLNVAL)) { |
5d385153 | 631 | p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
7594bf37 | 632 | p9_conn_cancel(m, err); |
5503ac56 EVH |
633 | } |
634 | ||
a9a08845 | 635 | if (n & EPOLLIN) { |
5503ac56 | 636 | set_bit(Rpending, &m->wsched); |
5d385153 | 637 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 | 638 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 639 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 640 | schedule_work(&m->rq); |
5503ac56 EVH |
641 | } |
642 | } | |
8a0dc95f | 643 | |
a9a08845 | 644 | if (n & EPOLLOUT) { |
5503ac56 | 645 | set_bit(Wpending, &m->wsched); |
5d385153 | 646 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
f64f9e71 JP |
647 | if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
648 | !test_and_set_bit(Wworksched, &m->wsched)) { | |
5d385153 | 649 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
61edeeed | 650 | schedule_work(&m->wq); |
5503ac56 EVH |
651 | } |
652 | } | |
8a0dc95f EVH |
653 | } |
654 | ||
655 | /** | |
91b8534f | 656 | * p9_fd_request - send 9P request |
8a0dc95f EVH |
657 | * The function can sleep until the request is scheduled for sending. |
658 | * The function can be interrupted. Return from the function is not | |
91b8534f | 659 | * a guarantee that the request is sent successfully. |
8a0dc95f | 660 | * |
91b8534f EVH |
661 | * @client: client instance |
662 | * @req: request to be sent | |
ee443996 | 663 | * |
8a0dc95f | 664 | */ |
ee443996 | 665 | |
91b8534f | 666 | static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f | 667 | { |
7594bf37 | 668 | __poll_t n; |
91b8534f | 669 | struct p9_trans_fd *ts = client->trans; |
263c5828 | 670 | struct p9_conn *m = &ts->conn; |
8a0dc95f | 671 | |
5d385153 | 672 | p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", |
523adb6c | 673 | m, current, &req->tc, req->tc.id); |
8a0dc95f | 674 | if (m->err < 0) |
91b8534f | 675 | return m->err; |
8a0dc95f | 676 | |
296ab4a8 | 677 | spin_lock(&m->req_lock); |
1a4f69ef | 678 | WRITE_ONCE(req->status, REQ_STATUS_UNSENT); |
8a0dc95f | 679 | list_add_tail(&req->req_list, &m->unsent_req_list); |
296ab4a8 | 680 | spin_unlock(&m->req_lock); |
8a0dc95f EVH |
681 | |
682 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
a9a08845 | 683 | n = EPOLLOUT; |
8a0dc95f | 684 | else |
7594bf37 | 685 | n = p9_fd_poll(m->client, NULL, NULL); |
8a0dc95f | 686 | |
a9a08845 | 687 | if (n & EPOLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) |
61edeeed | 688 | schedule_work(&m->wq); |
8a0dc95f | 689 | |
91b8534f | 690 | return 0; |
8a0dc95f EVH |
691 | } |
692 | ||
91b8534f | 693 | static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f | 694 | { |
296ab4a8 DM |
695 | struct p9_trans_fd *ts = client->trans; |
696 | struct p9_conn *m = &ts->conn; | |
7eb923b8 | 697 | int ret = 1; |
8a0dc95f | 698 | |
5d385153 | 699 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
8a0dc95f | 700 | |
296ab4a8 | 701 | spin_lock(&m->req_lock); |
91b8534f | 702 | |
91b8534f | 703 | if (req->status == REQ_STATUS_UNSENT) { |
1bab88b2 | 704 | list_del(&req->req_list); |
1a4f69ef | 705 | WRITE_ONCE(req->status, REQ_STATUS_FLSHD); |
8b11ff09 | 706 | p9_req_put(client, req); |
7eb923b8 | 707 | ret = 0; |
0bfd6845 | 708 | } |
296ab4a8 | 709 | spin_unlock(&m->req_lock); |
7eb923b8 EVH |
710 | |
711 | return ret; | |
8a0dc95f EVH |
712 | } |
713 | ||
afd8d654 SD |
714 | static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req) |
715 | { | |
296ab4a8 DM |
716 | struct p9_trans_fd *ts = client->trans; |
717 | struct p9_conn *m = &ts->conn; | |
718 | ||
afd8d654 SD |
719 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
720 | ||
296ab4a8 | 721 | spin_lock(&m->req_lock); |
74d6a5d5 WH |
722 | /* Ignore cancelled request if message has been received |
723 | * before lock. | |
724 | */ | |
725 | if (req->status == REQ_STATUS_RCVD) { | |
296ab4a8 | 726 | spin_unlock(&m->req_lock); |
74d6a5d5 WH |
727 | return 0; |
728 | } | |
729 | ||
afd8d654 SD |
730 | /* we haven't received a response for oldreq, |
731 | * remove it from the list. | |
732 | */ | |
afd8d654 | 733 | list_del(&req->req_list); |
1a4f69ef | 734 | WRITE_ONCE(req->status, REQ_STATUS_FLSHD); |
296ab4a8 DM |
735 | spin_unlock(&m->req_lock); |
736 | ||
8b11ff09 | 737 | p9_req_put(client, req); |
afd8d654 SD |
738 | |
739 | return 0; | |
740 | } | |
741 | ||
c4fac910 DH |
742 | static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt) |
743 | { | |
744 | if (clnt->trans_mod == &p9_tcp_trans) { | |
745 | if (clnt->trans_opts.tcp.port != P9_PORT) | |
61b272c3 | 746 | seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port); |
c4fac910 DH |
747 | } else if (clnt->trans_mod == &p9_fd_trans) { |
748 | if (clnt->trans_opts.fd.rfd != ~0) | |
61b272c3 | 749 | seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd); |
c4fac910 | 750 | if (clnt->trans_opts.fd.wfd != ~0) |
61b272c3 | 751 | seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd); |
c4fac910 DH |
752 | } |
753 | return 0; | |
754 | } | |
755 | ||
a80d923e | 756 | /** |
0e15597e AK |
757 | * parse_opts - parse mount options into p9_fd_opts structure |
758 | * @params: options string passed from mount | |
759 | * @opts: fd transport-specific structure to parse options into | |
a80d923e | 760 | * |
bb8ffdfc | 761 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 762 | */ |
bd238fb4 | 763 | |
bb8ffdfc | 764 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 765 | { |
a80d923e EVH |
766 | char *p; |
767 | substring_t args[MAX_OPT_ARGS]; | |
768 | int option; | |
d8c8a9e3 | 769 | char *options, *tmp_options; |
bd238fb4 | 770 | |
a80d923e EVH |
771 | opts->port = P9_PORT; |
772 | opts->rfd = ~0; | |
773 | opts->wfd = ~0; | |
c4fac910 | 774 | opts->privport = false; |
bd238fb4 | 775 | |
bb8ffdfc EVH |
776 | if (!params) |
777 | return 0; | |
778 | ||
d8c8a9e3 EVH |
779 | tmp_options = kstrdup(params, GFP_KERNEL); |
780 | if (!tmp_options) { | |
5d385153 JP |
781 | p9_debug(P9_DEBUG_ERROR, |
782 | "failed to allocate copy of option string\n"); | |
bb8ffdfc EVH |
783 | return -ENOMEM; |
784 | } | |
d8c8a9e3 | 785 | options = tmp_options; |
bd238fb4 | 786 | |
a80d923e EVH |
787 | while ((p = strsep(&options, ",")) != NULL) { |
788 | int token; | |
bb8ffdfc | 789 | int r; |
a80d923e EVH |
790 | if (!*p) |
791 | continue; | |
792 | token = match_token(p, tokens, args); | |
2f28c8b3 | 793 | if ((token != Opt_err) && (token != Opt_privport)) { |
15da4b16 AK |
794 | r = match_int(&args[0], &option); |
795 | if (r < 0) { | |
5d385153 JP |
796 | p9_debug(P9_DEBUG_ERROR, |
797 | "integer field, but no integer?\n"); | |
15da4b16 AK |
798 | continue; |
799 | } | |
a80d923e EVH |
800 | } |
801 | switch (token) { | |
802 | case Opt_port: | |
803 | opts->port = option; | |
804 | break; | |
805 | case Opt_rfdno: | |
806 | opts->rfd = option; | |
807 | break; | |
808 | case Opt_wfdno: | |
809 | opts->wfd = option; | |
810 | break; | |
2f28c8b3 | 811 | case Opt_privport: |
c4fac910 | 812 | opts->privport = true; |
2f28c8b3 | 813 | break; |
a80d923e EVH |
814 | default: |
815 | continue; | |
816 | } | |
bd238fb4 | 817 | } |
d8c8a9e3 EVH |
818 | |
819 | kfree(tmp_options); | |
bb8ffdfc | 820 | return 0; |
bd238fb4 | 821 | } |
bd238fb4 | 822 | |
8b81ef58 | 823 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 824 | { |
263c5828 | 825 | struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd), |
a80d923e EVH |
826 | GFP_KERNEL); |
827 | if (!ts) | |
828 | return -ENOMEM; | |
bd238fb4 | 829 | |
a80d923e | 830 | ts->rd = fget(rfd); |
a39c4606 CH |
831 | if (!ts->rd) |
832 | goto out_free_ts; | |
833 | if (!(ts->rd->f_mode & FMODE_READ)) | |
834 | goto out_put_rd; | |
ef575281 TH |
835 | /* prevent workers from hanging on IO when fd is a pipe */ |
836 | ts->rd->f_flags |= O_NONBLOCK; | |
a80d923e | 837 | ts->wr = fget(wfd); |
a39c4606 CH |
838 | if (!ts->wr) |
839 | goto out_put_rd; | |
840 | if (!(ts->wr->f_mode & FMODE_WRITE)) | |
841 | goto out_put_wr; | |
ef575281 | 842 | ts->wr->f_flags |= O_NONBLOCK; |
bd238fb4 | 843 | |
8b81ef58 EVH |
844 | client->trans = ts; |
845 | client->status = Connected; | |
bd238fb4 | 846 | |
a80d923e | 847 | return 0; |
a39c4606 CH |
848 | |
849 | out_put_wr: | |
850 | fput(ts->wr); | |
851 | out_put_rd: | |
852 | fput(ts->rd); | |
853 | out_free_ts: | |
854 | kfree(ts); | |
855 | return -EIO; | |
bd238fb4 | 856 | } |
bd238fb4 | 857 | |
8b81ef58 | 858 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 | 859 | { |
6b18662e | 860 | struct p9_trans_fd *p; |
56b31d1c | 861 | struct file *file; |
6b18662e | 862 | |
263c5828 | 863 | p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); |
dcc14cfd WH |
864 | if (!p) { |
865 | sock_release(csocket); | |
6b18662e | 866 | return -ENOMEM; |
dcc14cfd | 867 | } |
bd238fb4 LI |
868 | |
869 | csocket->sk->sk_allocation = GFP_NOIO; | |
98123866 | 870 | csocket->sk->sk_use_task_frag = false; |
aab174f0 | 871 | file = sock_alloc_file(csocket, 0, NULL); |
56b31d1c | 872 | if (IS_ERR(file)) { |
5d385153 JP |
873 | pr_err("%s (%d): failed to map fd\n", |
874 | __func__, task_pid_nr(current)); | |
6b18662e | 875 | kfree(p); |
56b31d1c | 876 | return PTR_ERR(file); |
bd238fb4 LI |
877 | } |
878 | ||
56b31d1c AV |
879 | get_file(file); |
880 | p->wr = p->rd = file; | |
6b18662e AV |
881 | client->trans = p; |
882 | client->status = Connected; | |
883 | ||
6b18662e AV |
884 | p->rd->f_flags |= O_NONBLOCK; |
885 | ||
263c5828 | 886 | p9_conn_create(client); |
bd238fb4 LI |
887 | return 0; |
888 | } | |
889 | ||
bd238fb4 | 890 | /** |
54e625e3 | 891 | * p9_conn_destroy - cancels all pending requests of mux |
5503ac56 | 892 | * @m: mux to destroy |
bd238fb4 LI |
893 | * |
894 | */ | |
ee443996 | 895 | |
5503ac56 | 896 | static void p9_conn_destroy(struct p9_conn *m) |
bd238fb4 | 897 | { |
5d385153 JP |
898 | p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", |
899 | m, m->mux_list.prev, m->mux_list.next); | |
bd238fb4 | 900 | |
5503ac56 EVH |
901 | p9_mux_poll_stop(m); |
902 | cancel_work_sync(&m->rq); | |
fb488fc1 | 903 | if (m->rreq) { |
8b11ff09 | 904 | p9_req_put(m->client, m->rreq); |
fb488fc1 DM |
905 | m->rreq = NULL; |
906 | } | |
5503ac56 | 907 | cancel_work_sync(&m->wq); |
fb488fc1 | 908 | if (m->wreq) { |
8b11ff09 | 909 | p9_req_put(m->client, m->wreq); |
fb488fc1 DM |
910 | m->wreq = NULL; |
911 | } | |
bd238fb4 | 912 | |
5503ac56 | 913 | p9_conn_cancel(m, -ECONNRESET); |
bd238fb4 | 914 | |
5503ac56 | 915 | m->client = NULL; |
bd238fb4 LI |
916 | } |
917 | ||
918 | /** | |
8b81ef58 EVH |
919 | * p9_fd_close - shutdown file descriptor transport |
920 | * @client: client instance | |
bd238fb4 LI |
921 | * |
922 | */ | |
ee443996 | 923 | |
8b81ef58 | 924 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
925 | { |
926 | struct p9_trans_fd *ts; | |
927 | ||
8b81ef58 | 928 | if (!client) |
bd238fb4 LI |
929 | return; |
930 | ||
8b81ef58 | 931 | ts = client->trans; |
bd238fb4 LI |
932 | if (!ts) |
933 | return; | |
934 | ||
8b81ef58 EVH |
935 | client->status = Disconnected; |
936 | ||
263c5828 | 937 | p9_conn_destroy(&ts->conn); |
8a0dc95f | 938 | |
bd238fb4 LI |
939 | if (ts->rd) |
940 | fput(ts->rd); | |
941 | if (ts->wr) | |
942 | fput(ts->wr); | |
8b81ef58 | 943 | |
bd238fb4 LI |
944 | kfree(ts); |
945 | } | |
946 | ||
887b3ece EVH |
947 | /* |
948 | * stolen from NFS - maybe should be made a generic function? | |
949 | */ | |
950 | static inline int valid_ipaddr4(const char *buf) | |
951 | { | |
952 | int rc, count, in[4]; | |
953 | ||
954 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
955 | if (rc != 4) | |
956 | return -EINVAL; | |
957 | for (count = 0; count < 4; count++) { | |
958 | if (in[count] > 255) | |
959 | return -EINVAL; | |
960 | } | |
961 | return 0; | |
962 | } | |
963 | ||
2f28c8b3 JG |
964 | static int p9_bind_privport(struct socket *sock) |
965 | { | |
966 | struct sockaddr_in cl; | |
967 | int port, err = -EINVAL; | |
968 | ||
969 | memset(&cl, 0, sizeof(cl)); | |
970 | cl.sin_family = AF_INET; | |
6db6ea79 | 971 | cl.sin_addr.s_addr = htonl(INADDR_ANY); |
2f28c8b3 JG |
972 | for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { |
973 | cl.sin_port = htons((ushort)port); | |
974 | err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl)); | |
975 | if (err != -EADDRINUSE) | |
976 | break; | |
977 | } | |
978 | return err; | |
979 | } | |
980 | ||
981 | ||
8b81ef58 EVH |
982 | static int |
983 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
984 | { |
985 | int err; | |
a80d923e EVH |
986 | struct socket *csocket; |
987 | struct sockaddr_in sin_server; | |
988 | struct p9_fd_opts opts; | |
989 | ||
bb8ffdfc EVH |
990 | err = parse_opts(args, &opts); |
991 | if (err < 0) | |
8b81ef58 | 992 | return err; |
a80d923e | 993 | |
10aa1452 | 994 | if (addr == NULL || valid_ipaddr4(addr) < 0) |
8b81ef58 | 995 | return -EINVAL; |
887b3ece | 996 | |
a80d923e | 997 | csocket = NULL; |
a80d923e | 998 | |
c4fac910 DH |
999 | client->trans_opts.tcp.port = opts.port; |
1000 | client->trans_opts.tcp.privport = opts.privport; | |
a80d923e EVH |
1001 | sin_server.sin_family = AF_INET; |
1002 | sin_server.sin_addr.s_addr = in_aton(addr); | |
1003 | sin_server.sin_port = htons(opts.port); | |
0c5c9fb5 | 1004 | err = __sock_create(current->nsproxy->net_ns, PF_INET, |
e75762fd | 1005 | SOCK_STREAM, IPPROTO_TCP, &csocket, 1); |
6b18662e | 1006 | if (err) { |
5d385153 JP |
1007 | pr_err("%s (%d): problem creating socket\n", |
1008 | __func__, task_pid_nr(current)); | |
6b18662e | 1009 | return err; |
a80d923e EVH |
1010 | } |
1011 | ||
2f28c8b3 JG |
1012 | if (opts.privport) { |
1013 | err = p9_bind_privport(csocket); | |
1014 | if (err < 0) { | |
1015 | pr_err("%s (%d): problem binding to privport\n", | |
1016 | __func__, task_pid_nr(current)); | |
1017 | sock_release(csocket); | |
1018 | return err; | |
1019 | } | |
1020 | } | |
1021 | ||
a80d923e EVH |
1022 | err = csocket->ops->connect(csocket, |
1023 | (struct sockaddr *)&sin_server, | |
1024 | sizeof(struct sockaddr_in), 0); | |
1025 | if (err < 0) { | |
5d385153 JP |
1026 | pr_err("%s (%d): problem connecting socket to %s\n", |
1027 | __func__, task_pid_nr(current), addr); | |
a80d923e | 1028 | sock_release(csocket); |
6b18662e AV |
1029 | return err; |
1030 | } | |
a80d923e | 1031 | |
6b18662e | 1032 | return p9_socket_open(client, csocket); |
a80d923e EVH |
1033 | } |
1034 | ||
8b81ef58 EVH |
1035 | static int |
1036 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1037 | { |
1038 | int err; | |
1039 | struct socket *csocket; | |
1040 | struct sockaddr_un sun_server; | |
a80d923e EVH |
1041 | |
1042 | csocket = NULL; | |
a80d923e | 1043 | |
7ca1db21 | 1044 | if (!addr || !strlen(addr)) |
10aa1452 TB |
1045 | return -EINVAL; |
1046 | ||
cff6b8a9 | 1047 | if (strlen(addr) >= UNIX_PATH_MAX) { |
5d385153 JP |
1048 | pr_err("%s (%d): address too long: %s\n", |
1049 | __func__, task_pid_nr(current), addr); | |
6b18662e | 1050 | return -ENAMETOOLONG; |
a80d923e EVH |
1051 | } |
1052 | ||
1053 | sun_server.sun_family = PF_UNIX; | |
1054 | strcpy(sun_server.sun_path, addr); | |
0c5c9fb5 | 1055 | err = __sock_create(current->nsproxy->net_ns, PF_UNIX, |
e75762fd | 1056 | SOCK_STREAM, 0, &csocket, 1); |
6b18662e | 1057 | if (err < 0) { |
5d385153 JP |
1058 | pr_err("%s (%d): problem creating socket\n", |
1059 | __func__, task_pid_nr(current)); | |
1060 | ||
6b18662e AV |
1061 | return err; |
1062 | } | |
a80d923e EVH |
1063 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
1064 | sizeof(struct sockaddr_un) - 1, 0); | |
1065 | if (err < 0) { | |
5d385153 JP |
1066 | pr_err("%s (%d): problem connecting socket: %s: %d\n", |
1067 | __func__, task_pid_nr(current), addr, err); | |
a80d923e | 1068 | sock_release(csocket); |
6b18662e AV |
1069 | return err; |
1070 | } | |
a80d923e | 1071 | |
6b18662e | 1072 | return p9_socket_open(client, csocket); |
a80d923e EVH |
1073 | } |
1074 | ||
8b81ef58 EVH |
1075 | static int |
1076 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1077 | { |
1078 | int err; | |
a80d923e EVH |
1079 | struct p9_fd_opts opts; |
1080 | ||
a8e633c6 LZ |
1081 | err = parse_opts(args, &opts); |
1082 | if (err < 0) | |
1083 | return err; | |
c4fac910 DH |
1084 | client->trans_opts.fd.rfd = opts.rfd; |
1085 | client->trans_opts.fd.wfd = opts.wfd; | |
a80d923e EVH |
1086 | |
1087 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
5d385153 | 1088 | pr_err("Insufficient options for proto=fd\n"); |
8b81ef58 | 1089 | return -ENOPROTOOPT; |
a80d923e EVH |
1090 | } |
1091 | ||
8b81ef58 | 1092 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
a80d923e | 1093 | if (err < 0) |
6b18662e | 1094 | return err; |
a80d923e | 1095 | |
263c5828 | 1096 | p9_conn_create(client); |
8a0dc95f | 1097 | |
8b81ef58 | 1098 | return 0; |
a80d923e EVH |
1099 | } |
1100 | ||
1101 | static struct p9_trans_module p9_tcp_trans = { | |
1102 | .name = "tcp", | |
1103 | .maxsize = MAX_SOCK_BUF, | |
01d205d9 | 1104 | .pooled_rbuffers = false, |
f94741fd | 1105 | .def = 0, |
8b81ef58 EVH |
1106 | .create = p9_fd_create_tcp, |
1107 | .close = p9_fd_close, | |
91b8534f EVH |
1108 | .request = p9_fd_request, |
1109 | .cancel = p9_fd_cancel, | |
afd8d654 | 1110 | .cancelled = p9_fd_cancelled, |
c4fac910 | 1111 | .show_options = p9_fd_show_options, |
72029fe8 | 1112 | .owner = THIS_MODULE, |
a80d923e | 1113 | }; |
1c582c6d | 1114 | MODULE_ALIAS_9P("tcp"); |
a80d923e EVH |
1115 | |
1116 | static struct p9_trans_module p9_unix_trans = { | |
1117 | .name = "unix", | |
1118 | .maxsize = MAX_SOCK_BUF, | |
1119 | .def = 0, | |
8b81ef58 EVH |
1120 | .create = p9_fd_create_unix, |
1121 | .close = p9_fd_close, | |
91b8534f EVH |
1122 | .request = p9_fd_request, |
1123 | .cancel = p9_fd_cancel, | |
afd8d654 | 1124 | .cancelled = p9_fd_cancelled, |
c4fac910 | 1125 | .show_options = p9_fd_show_options, |
72029fe8 | 1126 | .owner = THIS_MODULE, |
a80d923e | 1127 | }; |
1c582c6d | 1128 | MODULE_ALIAS_9P("unix"); |
a80d923e EVH |
1129 | |
1130 | static struct p9_trans_module p9_fd_trans = { | |
1131 | .name = "fd", | |
1132 | .maxsize = MAX_SOCK_BUF, | |
1133 | .def = 0, | |
8b81ef58 EVH |
1134 | .create = p9_fd_create, |
1135 | .close = p9_fd_close, | |
91b8534f EVH |
1136 | .request = p9_fd_request, |
1137 | .cancel = p9_fd_cancel, | |
afd8d654 | 1138 | .cancelled = p9_fd_cancelled, |
c4fac910 | 1139 | .show_options = p9_fd_show_options, |
72029fe8 | 1140 | .owner = THIS_MODULE, |
a80d923e | 1141 | }; |
1c582c6d | 1142 | MODULE_ALIAS_9P("fd"); |
a80d923e | 1143 | |
5503ac56 | 1144 | /** |
4a026da9 SL |
1145 | * p9_poll_workfn - poll worker thread |
1146 | * @work: work queue | |
5503ac56 EVH |
1147 | * |
1148 | * polls all v9fs transports for new events and queues the appropriate | |
1149 | * work to the work queue | |
1150 | * | |
1151 | */ | |
1152 | ||
aa70c585 | 1153 | static void p9_poll_workfn(struct work_struct *work) |
5503ac56 EVH |
1154 | { |
1155 | unsigned long flags; | |
1156 | ||
5d385153 | 1157 | p9_debug(P9_DEBUG_TRANS, "start %p\n", current); |
aa70c585 | 1158 | |
5503ac56 EVH |
1159 | spin_lock_irqsave(&p9_poll_lock, flags); |
1160 | while (!list_empty(&p9_poll_pending_list)) { | |
1161 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
1162 | struct p9_conn, | |
1163 | poll_pending_link); | |
1164 | list_del_init(&conn->poll_pending_link); | |
1165 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1166 | ||
1167 | p9_poll_mux(conn); | |
1168 | ||
1169 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1170 | } | |
1171 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1172 | ||
5d385153 | 1173 | p9_debug(P9_DEBUG_TRANS, "finish\n"); |
5503ac56 EVH |
1174 | } |
1175 | ||
1c582c6d | 1176 | static int __init p9_trans_fd_init(void) |
a80d923e EVH |
1177 | { |
1178 | v9fs_register_trans(&p9_tcp_trans); | |
1179 | v9fs_register_trans(&p9_unix_trans); | |
1180 | v9fs_register_trans(&p9_fd_trans); | |
1181 | ||
3387b804 | 1182 | return 0; |
a80d923e | 1183 | } |
72029fe8 | 1184 | |
1c582c6d | 1185 | static void __exit p9_trans_fd_exit(void) |
72029fe8 | 1186 | { |
43829731 | 1187 | flush_work(&p9_poll_work); |
72029fe8 TH |
1188 | v9fs_unregister_trans(&p9_tcp_trans); |
1189 | v9fs_unregister_trans(&p9_unix_trans); | |
1190 | v9fs_unregister_trans(&p9_fd_trans); | |
1191 | } | |
1c582c6d TW |
1192 | |
1193 | module_init(p9_trans_fd_init); | |
1194 | module_exit(p9_trans_fd_exit); | |
1195 | ||
1196 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); | |
1197 | MODULE_DESCRIPTION("Filedescriptor Transport for 9P"); | |
1198 | MODULE_LICENSE("GPL"); |