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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
bd238fb4 LI |
2 | /* |
3 | * linux/fs/9p/trans_fd.c | |
4 | * | |
5 | * Fd transport layer. Includes deprecated socket layer. | |
6 | * | |
7 | * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> | |
8 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> | |
8a0dc95f | 9 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 | 10 | * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
bd238fb4 LI |
11 | */ |
12 | ||
5d385153 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
bd238fb4 LI |
15 | #include <linux/in.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/net.h> | |
18 | #include <linux/ipv6.h> | |
8a0dc95f | 19 | #include <linux/kthread.h> |
bd238fb4 LI |
20 | #include <linux/errno.h> |
21 | #include <linux/kernel.h> | |
22 | #include <linux/un.h> | |
23 | #include <linux/uaccess.h> | |
24 | #include <linux/inet.h> | |
25 | #include <linux/idr.h> | |
26 | #include <linux/file.h> | |
a80d923e | 27 | #include <linux/parser.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
c4fac910 | 29 | #include <linux/seq_file.h> |
bd238fb4 | 30 | #include <net/9p/9p.h> |
8b81ef58 | 31 | #include <net/9p/client.h> |
bd238fb4 LI |
32 | #include <net/9p/transport.h> |
33 | ||
6b18662e AV |
34 | #include <linux/syscalls.h> /* killme */ |
35 | ||
bd238fb4 | 36 | #define P9_PORT 564 |
22bb3b79 | 37 | #define MAX_SOCK_BUF (1024*1024) |
8a0dc95f | 38 | #define MAXPOLLWADDR 2 |
a80d923e | 39 | |
c4fac910 DH |
40 | static struct p9_trans_module p9_tcp_trans; |
41 | static struct p9_trans_module p9_fd_trans; | |
42 | ||
ee443996 EVH |
43 | /** |
44 | * struct p9_fd_opts - per-transport options | |
45 | * @rfd: file descriptor for reading (trans=fd) | |
46 | * @wfd: file descriptor for writing (trans=fd) | |
47 | * @port: port to connect to (trans=tcp) | |
760b3d61 | 48 | * @privport: port is privileged |
ee443996 EVH |
49 | */ |
50 | ||
a80d923e EVH |
51 | struct p9_fd_opts { |
52 | int rfd; | |
53 | int wfd; | |
54 | u16 port; | |
c4fac910 | 55 | bool privport; |
a80d923e | 56 | }; |
bd238fb4 | 57 | |
a80d923e EVH |
58 | /* |
59 | * Option Parsing (code inspired by NFS code) | |
60 | * - a little lazy - parse all fd-transport options | |
61 | */ | |
bd238fb4 | 62 | |
a80d923e EVH |
63 | enum { |
64 | /* Options that take integer arguments */ | |
55762690 | 65 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
2f28c8b3 JG |
66 | /* Options that take no arguments */ |
67 | Opt_privport, | |
a80d923e | 68 | }; |
bd238fb4 | 69 | |
a447c093 | 70 | static const match_table_t tokens = { |
a80d923e EVH |
71 | {Opt_port, "port=%u"}, |
72 | {Opt_rfdno, "rfdno=%u"}, | |
73 | {Opt_wfdno, "wfdno=%u"}, | |
2f28c8b3 | 74 | {Opt_privport, "privport"}, |
55762690 | 75 | {Opt_err, NULL}, |
a80d923e | 76 | }; |
bd238fb4 | 77 | |
8a0dc95f EVH |
78 | enum { |
79 | Rworksched = 1, /* read work scheduled or running */ | |
80 | Rpending = 2, /* can read */ | |
81 | Wworksched = 4, /* write work scheduled or running */ | |
82 | Wpending = 8, /* can write */ | |
83 | }; | |
84 | ||
992b3f1d TH |
85 | struct p9_poll_wait { |
86 | struct p9_conn *conn; | |
ac6424b9 | 87 | wait_queue_entry_t wait; |
992b3f1d | 88 | wait_queue_head_t *wait_addr; |
ee443996 EVH |
89 | }; |
90 | ||
91 | /** | |
92 | * struct p9_conn - fd mux connection state information | |
ee443996 | 93 | * @mux_list: list link for mux to manage multiple connections (?) |
8b81ef58 | 94 | * @client: reference to client instance for this connection |
ee443996 | 95 | * @err: error state |
cc9cde95 | 96 | * @req_lock: lock protecting req_list and requests statuses |
ee443996 EVH |
97 | * @req_list: accounting for requests which have been sent |
98 | * @unsent_req_list: accounting for requests that haven't been sent | |
760b3d61 AL |
99 | * @rreq: read request |
100 | * @wreq: write request | |
1b0a763b EVH |
101 | * @req: current request being processed (if any) |
102 | * @tmp_buf: temporary buffer to read in header | |
947867aa | 103 | * @rc: temporary fcall for reading current frame |
ee443996 EVH |
104 | * @wpos: write position for current frame |
105 | * @wsize: amount of data to write for current frame | |
106 | * @wbuf: current write buffer | |
0e15597e | 107 | * @poll_pending_link: pending links to be polled per conn |
ee443996 | 108 | * @poll_wait: array of wait_q's for various worker threads |
ee443996 EVH |
109 | * @pt: poll state |
110 | * @rq: current read work | |
111 | * @wq: current write work | |
112 | * @wsched: ???? | |
113 | * | |
114 | */ | |
8a0dc95f EVH |
115 | |
116 | struct p9_conn { | |
8a0dc95f | 117 | struct list_head mux_list; |
8b81ef58 | 118 | struct p9_client *client; |
8a0dc95f | 119 | int err; |
cc9cde95 | 120 | spinlock_t req_lock; |
8a0dc95f EVH |
121 | struct list_head req_list; |
122 | struct list_head unsent_req_list; | |
6d35190f | 123 | struct p9_req_t *rreq; |
728356de | 124 | struct p9_req_t *wreq; |
b2b1d17c | 125 | char tmp_buf[P9_HDRSZ]; |
947867aa | 126 | struct p9_fcall rc; |
8a0dc95f EVH |
127 | int wpos; |
128 | int wsize; | |
129 | char *wbuf; | |
992b3f1d TH |
130 | struct list_head poll_pending_link; |
131 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
132 | poll_table pt; |
133 | struct work_struct rq; | |
134 | struct work_struct wq; | |
135 | unsigned long wsched; | |
136 | }; | |
137 | ||
263c5828 SD |
138 | /** |
139 | * struct p9_trans_fd - transport state | |
140 | * @rd: reference to file to read from | |
141 | * @wr: reference of file to write to | |
142 | * @conn: connection state reference | |
143 | * | |
144 | */ | |
145 | ||
146 | struct p9_trans_fd { | |
147 | struct file *rd; | |
148 | struct file *wr; | |
149 | struct p9_conn conn; | |
150 | }; | |
151 | ||
aa70c585 TH |
152 | static void p9_poll_workfn(struct work_struct *work); |
153 | ||
992b3f1d TH |
154 | static DEFINE_SPINLOCK(p9_poll_lock); |
155 | static LIST_HEAD(p9_poll_pending_list); | |
aa70c585 | 156 | static DECLARE_WORK(p9_poll_work, p9_poll_workfn); |
8a0dc95f | 157 | |
2f28c8b3 JG |
158 | static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT; |
159 | static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT; | |
160 | ||
992b3f1d | 161 | static void p9_mux_poll_stop(struct p9_conn *m) |
8a0dc95f | 162 | { |
992b3f1d TH |
163 | unsigned long flags; |
164 | int i; | |
8a0dc95f | 165 | |
992b3f1d TH |
166 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
167 | struct p9_poll_wait *pwait = &m->poll_wait[i]; | |
8a0dc95f | 168 | |
992b3f1d TH |
169 | if (pwait->wait_addr) { |
170 | remove_wait_queue(pwait->wait_addr, &pwait->wait); | |
171 | pwait->wait_addr = NULL; | |
8a0dc95f | 172 | } |
8a0dc95f EVH |
173 | } |
174 | ||
992b3f1d TH |
175 | spin_lock_irqsave(&p9_poll_lock, flags); |
176 | list_del_init(&m->poll_pending_link); | |
177 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
430ac66e TB |
178 | |
179 | flush_work(&p9_poll_work); | |
8a0dc95f EVH |
180 | } |
181 | ||
182 | /** | |
5503ac56 EVH |
183 | * p9_conn_cancel - cancel all pending requests with error |
184 | * @m: mux data | |
185 | * @err: error code | |
8a0dc95f | 186 | * |
8a0dc95f | 187 | */ |
ee443996 | 188 | |
51a87c55 | 189 | static void p9_conn_cancel(struct p9_conn *m, int err) |
8a0dc95f | 190 | { |
673d62cd | 191 | struct p9_req_t *req, *rtmp; |
5503ac56 | 192 | LIST_HEAD(cancel_list); |
8a0dc95f | 193 | |
5d385153 | 194 | p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
7eb923b8 | 195 | |
cc9cde95 | 196 | spin_lock(&m->req_lock); |
7eb923b8 EVH |
197 | |
198 | if (m->err) { | |
cc9cde95 | 199 | spin_unlock(&m->req_lock); |
7eb923b8 EVH |
200 | return; |
201 | } | |
202 | ||
203 | m->err = err; | |
204 | ||
5503ac56 EVH |
205 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
206 | list_move(&req->req_list, &cancel_list); | |
17cb5e61 | 207 | req->status = REQ_STATUS_ERROR; |
5503ac56 EVH |
208 | } |
209 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
210 | list_move(&req->req_list, &cancel_list); | |
17cb5e61 | 211 | req->status = REQ_STATUS_ERROR; |
8a0dc95f EVH |
212 | } |
213 | ||
cc9cde95 | 214 | spin_unlock(&m->req_lock); |
e8b43ded | 215 | |
5503ac56 | 216 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
5d385153 | 217 | p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); |
1bab88b2 | 218 | list_del(&req->req_list); |
2b6e72ed DM |
219 | if (!req->t_err) |
220 | req->t_err = err; | |
221 | p9_client_cb(m->client, req, REQ_STATUS_ERROR); | |
8a0dc95f | 222 | } |
8a0dc95f EVH |
223 | } |
224 | ||
7594bf37 AV |
225 | static __poll_t |
226 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err) | |
8a0dc95f | 227 | { |
9965ed17 | 228 | __poll_t ret; |
5503ac56 | 229 | struct p9_trans_fd *ts = NULL; |
8a0dc95f | 230 | |
5503ac56 EVH |
231 | if (client && client->status == Connected) |
232 | ts = client->trans; | |
7dc5d24b | 233 | |
7594bf37 AV |
234 | if (!ts) { |
235 | if (err) | |
236 | *err = -EREMOTEIO; | |
a9a08845 | 237 | return EPOLLERR; |
7594bf37 | 238 | } |
7dc5d24b | 239 | |
9965ed17 CH |
240 | ret = vfs_poll(ts->rd, pt); |
241 | if (ts->rd != ts->wr) | |
242 | ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN); | |
5503ac56 | 243 | return ret; |
992b3f1d TH |
244 | } |
245 | ||
8a0dc95f | 246 | /** |
5503ac56 EVH |
247 | * p9_fd_read- read from a fd |
248 | * @client: client instance | |
249 | * @v: buffer to receive data into | |
250 | * @len: size of receive buffer | |
ee443996 | 251 | * |
8a0dc95f | 252 | */ |
ee443996 | 253 | |
5503ac56 | 254 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
8a0dc95f | 255 | { |
5503ac56 EVH |
256 | int ret; |
257 | struct p9_trans_fd *ts = NULL; | |
bdd1d2d3 | 258 | loff_t pos; |
8a0dc95f | 259 | |
5503ac56 EVH |
260 | if (client && client->status != Disconnected) |
261 | ts = client->trans; | |
8a0dc95f | 262 | |
5503ac56 EVH |
263 | if (!ts) |
264 | return -EREMOTEIO; | |
8a0dc95f | 265 | |
5503ac56 | 266 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
5d385153 | 267 | p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); |
8a0dc95f | 268 | |
bdd1d2d3 CH |
269 | pos = ts->rd->f_pos; |
270 | ret = kernel_read(ts->rd, v, len, &pos); | |
5503ac56 EVH |
271 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
272 | client->status = Disconnected; | |
273 | return ret; | |
8a0dc95f EVH |
274 | } |
275 | ||
276 | /** | |
5503ac56 EVH |
277 | * p9_read_work - called when there is some data to be read from a transport |
278 | * @work: container of work to be done | |
ee443996 | 279 | * |
8a0dc95f | 280 | */ |
ee443996 | 281 | |
5503ac56 | 282 | static void p9_read_work(struct work_struct *work) |
8a0dc95f | 283 | { |
7594bf37 AV |
284 | __poll_t n; |
285 | int err; | |
5503ac56 | 286 | struct p9_conn *m; |
5503ac56 EVH |
287 | |
288 | m = container_of(work, struct p9_conn, rq); | |
8a0dc95f EVH |
289 | |
290 | if (m->err < 0) | |
291 | return; | |
292 | ||
947867aa | 293 | p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset); |
8a0dc95f | 294 | |
947867aa DM |
295 | if (!m->rc.sdata) { |
296 | m->rc.sdata = m->tmp_buf; | |
297 | m->rc.offset = 0; | |
b2b1d17c | 298 | m->rc.capacity = P9_HDRSZ; /* start by reading header */ |
8a0dc95f EVH |
299 | } |
300 | ||
5503ac56 | 301 | clear_bit(Rpending, &m->wsched); |
947867aa DM |
302 | p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n", |
303 | m, m->rc.offset, m->rc.capacity, | |
304 | m->rc.capacity - m->rc.offset); | |
305 | err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset, | |
306 | m->rc.capacity - m->rc.offset); | |
5d385153 | 307 | p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
947867aa | 308 | if (err == -EAGAIN) |
0462194d | 309 | goto end_clear; |
8a0dc95f | 310 | |
5503ac56 EVH |
311 | if (err <= 0) |
312 | goto error; | |
313 | ||
947867aa | 314 | m->rc.offset += err; |
1b0a763b | 315 | |
947867aa | 316 | /* header read in */ |
6d35190f | 317 | if ((!m->rreq) && (m->rc.offset == m->rc.capacity)) { |
5d385153 | 318 | p9_debug(P9_DEBUG_TRANS, "got new header\n"); |
1b0a763b | 319 | |
f984579a | 320 | /* Header size */ |
b2b1d17c | 321 | m->rc.size = P9_HDRSZ; |
f984579a | 322 | err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0); |
947867aa DM |
323 | if (err) { |
324 | p9_debug(P9_DEBUG_ERROR, | |
325 | "error parsing header: %d\n", err); | |
326 | goto error; | |
327 | } | |
328 | ||
329 | if (m->rc.size >= m->client->msize) { | |
5d385153 | 330 | p9_debug(P9_DEBUG_ERROR, |
947867aa DM |
331 | "requested packet size too big: %d\n", |
332 | m->rc.size); | |
5503ac56 EVH |
333 | err = -EIO; |
334 | goto error; | |
335 | } | |
336 | ||
5d385153 | 337 | p9_debug(P9_DEBUG_TRANS, |
947867aa DM |
338 | "mux %p pkt: size: %d bytes tag: %d\n", |
339 | m, m->rc.size, m->rc.tag); | |
1b0a763b | 340 | |
6d35190f TB |
341 | m->rreq = p9_tag_lookup(m->client, m->rc.tag); |
342 | if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) { | |
5d385153 | 343 | p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
947867aa | 344 | m->rc.tag); |
1b0a763b EVH |
345 | err = -EIO; |
346 | goto error; | |
347 | } | |
348 | ||
6d35190f | 349 | if (!m->rreq->rc.sdata) { |
3053600e DM |
350 | p9_debug(P9_DEBUG_ERROR, |
351 | "No recv fcall for tag %d (req %p), disconnecting!\n", | |
6d35190f | 352 | m->rc.tag, m->rreq); |
cee18833 | 353 | p9_req_put(m->client, m->rreq); |
6d35190f | 354 | m->rreq = NULL; |
3053600e DM |
355 | err = -EIO; |
356 | goto error; | |
1b0a763b | 357 | } |
6d35190f | 358 | m->rc.sdata = m->rreq->rc.sdata; |
947867aa DM |
359 | memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity); |
360 | m->rc.capacity = m->rc.size; | |
1b0a763b | 361 | } |
5503ac56 | 362 | |
947867aa DM |
363 | /* packet is read in |
364 | * not an else because some packets (like clunk) have no payload | |
365 | */ | |
6d35190f | 366 | if ((m->rreq) && (m->rc.offset == m->rc.capacity)) { |
5d385153 | 367 | p9_debug(P9_DEBUG_TRANS, "got new packet\n"); |
6d35190f | 368 | m->rreq->rc.size = m->rc.offset; |
cc9cde95 | 369 | spin_lock(&m->req_lock); |
e4ca13f7 DM |
370 | if (m->rreq->status == REQ_STATUS_SENT) { |
371 | list_del(&m->rreq->req_list); | |
372 | p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD); | |
74d6a5d5 WH |
373 | } else if (m->rreq->status == REQ_STATUS_FLSHD) { |
374 | /* Ignore replies associated with a cancelled request. */ | |
375 | p9_debug(P9_DEBUG_TRANS, | |
376 | "Ignore replies associated with a cancelled request\n"); | |
e4ca13f7 | 377 | } else { |
cc9cde95 | 378 | spin_unlock(&m->req_lock); |
e4ca13f7 DM |
379 | p9_debug(P9_DEBUG_ERROR, |
380 | "Request tag %d errored out while we were reading the reply\n", | |
381 | m->rc.tag); | |
382 | err = -EIO; | |
383 | goto error; | |
384 | } | |
cc9cde95 | 385 | spin_unlock(&m->req_lock); |
947867aa DM |
386 | m->rc.sdata = NULL; |
387 | m->rc.offset = 0; | |
388 | m->rc.capacity = 0; | |
59d7730c | 389 | p9_req_put(m->client, m->rreq); |
6d35190f | 390 | m->rreq = NULL; |
5503ac56 EVH |
391 | } |
392 | ||
0462194d SD |
393 | end_clear: |
394 | clear_bit(Rworksched, &m->wsched); | |
395 | ||
5503ac56 EVH |
396 | if (!list_empty(&m->req_list)) { |
397 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
a9a08845 | 398 | n = EPOLLIN; |
5503ac56 | 399 | else |
7594bf37 | 400 | n = p9_fd_poll(m->client, NULL, NULL); |
5503ac56 | 401 | |
a9a08845 | 402 | if ((n & EPOLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 403 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 404 | schedule_work(&m->rq); |
0462194d SD |
405 | } |
406 | } | |
5503ac56 EVH |
407 | |
408 | return; | |
5503ac56 EVH |
409 | error: |
410 | p9_conn_cancel(m, err); | |
411 | clear_bit(Rworksched, &m->wsched); | |
412 | } | |
413 | ||
414 | /** | |
415 | * p9_fd_write - write to a socket | |
416 | * @client: client instance | |
417 | * @v: buffer to send data from | |
418 | * @len: size of send buffer | |
ee443996 | 419 | * |
8a0dc95f | 420 | */ |
ee443996 | 421 | |
5503ac56 | 422 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
8a0dc95f | 423 | { |
670986ec | 424 | ssize_t ret; |
5503ac56 | 425 | struct p9_trans_fd *ts = NULL; |
8a0dc95f | 426 | |
5503ac56 EVH |
427 | if (client && client->status != Disconnected) |
428 | ts = client->trans; | |
8a0dc95f | 429 | |
5503ac56 EVH |
430 | if (!ts) |
431 | return -EREMOTEIO; | |
8a0dc95f | 432 | |
5503ac56 | 433 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
5d385153 | 434 | p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); |
992b3f1d | 435 | |
670986ec | 436 | ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos); |
5503ac56 EVH |
437 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
438 | client->status = Disconnected; | |
439 | return ret; | |
8a0dc95f EVH |
440 | } |
441 | ||
442 | /** | |
443 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
444 | * @work: container for work to be done |
445 | * | |
8a0dc95f | 446 | */ |
ee443996 | 447 | |
8a0dc95f EVH |
448 | static void p9_write_work(struct work_struct *work) |
449 | { | |
7594bf37 AV |
450 | __poll_t n; |
451 | int err; | |
8a0dc95f | 452 | struct p9_conn *m; |
673d62cd | 453 | struct p9_req_t *req; |
8a0dc95f EVH |
454 | |
455 | m = container_of(work, struct p9_conn, wq); | |
456 | ||
457 | if (m->err < 0) { | |
458 | clear_bit(Wworksched, &m->wsched); | |
459 | return; | |
460 | } | |
461 | ||
462 | if (!m->wsize) { | |
cc9cde95 | 463 | spin_lock(&m->req_lock); |
8a0dc95f EVH |
464 | if (list_empty(&m->unsent_req_list)) { |
465 | clear_bit(Wworksched, &m->wsched); | |
cc9cde95 | 466 | spin_unlock(&m->req_lock); |
8a0dc95f EVH |
467 | return; |
468 | } | |
469 | ||
673d62cd | 470 | req = list_entry(m->unsent_req_list.next, struct p9_req_t, |
8a0dc95f | 471 | req_list); |
673d62cd | 472 | req->status = REQ_STATUS_SENT; |
5d385153 | 473 | p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); |
8a0dc95f | 474 | list_move_tail(&req->req_list, &m->req_list); |
8a0dc95f | 475 | |
523adb6c DM |
476 | m->wbuf = req->tc.sdata; |
477 | m->wsize = req->tc.size; | |
8a0dc95f | 478 | m->wpos = 0; |
728356de TB |
479 | p9_req_get(req); |
480 | m->wreq = req; | |
cc9cde95 | 481 | spin_unlock(&m->req_lock); |
8a0dc95f EVH |
482 | } |
483 | ||
5d385153 JP |
484 | p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", |
485 | m, m->wpos, m->wsize); | |
8a0dc95f | 486 | clear_bit(Wpending, &m->wsched); |
8b81ef58 | 487 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
5d385153 | 488 | p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); |
584a8c13 SD |
489 | if (err == -EAGAIN) |
490 | goto end_clear; | |
491 | ||
8a0dc95f EVH |
492 | |
493 | if (err < 0) | |
494 | goto error; | |
495 | else if (err == 0) { | |
496 | err = -EREMOTEIO; | |
497 | goto error; | |
498 | } | |
499 | ||
500 | m->wpos += err; | |
728356de | 501 | if (m->wpos == m->wsize) { |
8a0dc95f | 502 | m->wpos = m->wsize = 0; |
59d7730c | 503 | p9_req_put(m->client, m->wreq); |
728356de TB |
504 | m->wreq = NULL; |
505 | } | |
8a0dc95f | 506 | |
584a8c13 SD |
507 | end_clear: |
508 | clear_bit(Wworksched, &m->wsched); | |
509 | ||
1957b3a8 | 510 | if (m->wsize || !list_empty(&m->unsent_req_list)) { |
8a0dc95f | 511 | if (test_and_clear_bit(Wpending, &m->wsched)) |
a9a08845 | 512 | n = EPOLLOUT; |
8a0dc95f | 513 | else |
7594bf37 | 514 | n = p9_fd_poll(m->client, NULL, NULL); |
8a0dc95f | 515 | |
a9a08845 | 516 | if ((n & EPOLLOUT) && |
584a8c13 | 517 | !test_and_set_bit(Wworksched, &m->wsched)) { |
5d385153 | 518 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
61edeeed | 519 | schedule_work(&m->wq); |
584a8c13 SD |
520 | } |
521 | } | |
8a0dc95f EVH |
522 | |
523 | return; | |
524 | ||
525 | error: | |
526 | p9_conn_cancel(m, err); | |
527 | clear_bit(Wworksched, &m->wsched); | |
528 | } | |
529 | ||
ac6424b9 | 530 | static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key) |
8a0dc95f | 531 | { |
5503ac56 EVH |
532 | struct p9_poll_wait *pwait = |
533 | container_of(wait, struct p9_poll_wait, wait); | |
534 | struct p9_conn *m = pwait->conn; | |
535 | unsigned long flags; | |
8a0dc95f | 536 | |
5503ac56 EVH |
537 | spin_lock_irqsave(&p9_poll_lock, flags); |
538 | if (list_empty(&m->poll_pending_link)) | |
539 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); | |
540 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f | 541 | |
aa70c585 TH |
542 | schedule_work(&p9_poll_work); |
543 | return 1; | |
8a0dc95f EVH |
544 | } |
545 | ||
546 | /** | |
5503ac56 EVH |
547 | * p9_pollwait - add poll task to the wait queue |
548 | * @filp: file pointer being polled | |
549 | * @wait_address: wait_q to block on | |
550 | * @p: poll state | |
ee443996 | 551 | * |
5503ac56 | 552 | * called by files poll operation to add v9fs-poll task to files wait queue |
8a0dc95f | 553 | */ |
ee443996 | 554 | |
5503ac56 EVH |
555 | static void |
556 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
8a0dc95f | 557 | { |
5503ac56 EVH |
558 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
559 | struct p9_poll_wait *pwait = NULL; | |
560 | int i; | |
8a0dc95f | 561 | |
5503ac56 EVH |
562 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
563 | if (m->poll_wait[i].wait_addr == NULL) { | |
564 | pwait = &m->poll_wait[i]; | |
565 | break; | |
8a0dc95f | 566 | } |
8a0dc95f EVH |
567 | } |
568 | ||
5503ac56 | 569 | if (!pwait) { |
5d385153 | 570 | p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
8a0dc95f EVH |
571 | return; |
572 | } | |
573 | ||
5503ac56 EVH |
574 | pwait->conn = m; |
575 | pwait->wait_addr = wait_address; | |
576 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); | |
577 | add_wait_queue(wait_address, &pwait->wait); | |
578 | } | |
8a0dc95f | 579 | |
5503ac56 | 580 | /** |
263c5828 | 581 | * p9_conn_create - initialize the per-session mux data |
5503ac56 EVH |
582 | * @client: client instance |
583 | * | |
584 | * Note: Creates the polling task if this is the first session. | |
585 | */ | |
8a0dc95f | 586 | |
263c5828 | 587 | static void p9_conn_create(struct p9_client *client) |
5503ac56 | 588 | { |
7594bf37 | 589 | __poll_t n; |
263c5828 SD |
590 | struct p9_trans_fd *ts = client->trans; |
591 | struct p9_conn *m = &ts->conn; | |
8a0dc95f | 592 | |
5d385153 | 593 | p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); |
8a0dc95f | 594 | |
5503ac56 EVH |
595 | INIT_LIST_HEAD(&m->mux_list); |
596 | m->client = client; | |
8a0dc95f | 597 | |
cc9cde95 | 598 | spin_lock_init(&m->req_lock); |
5503ac56 EVH |
599 | INIT_LIST_HEAD(&m->req_list); |
600 | INIT_LIST_HEAD(&m->unsent_req_list); | |
601 | INIT_WORK(&m->rq, p9_read_work); | |
602 | INIT_WORK(&m->wq, p9_write_work); | |
603 | INIT_LIST_HEAD(&m->poll_pending_link); | |
604 | init_poll_funcptr(&m->pt, p9_pollwait); | |
8a0dc95f | 605 | |
7594bf37 | 606 | n = p9_fd_poll(client, &m->pt, NULL); |
a9a08845 | 607 | if (n & EPOLLIN) { |
5d385153 | 608 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 EVH |
609 | set_bit(Rpending, &m->wsched); |
610 | } | |
8a0dc95f | 611 | |
a9a08845 | 612 | if (n & EPOLLOUT) { |
5d385153 | 613 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
5503ac56 EVH |
614 | set_bit(Wpending, &m->wsched); |
615 | } | |
5503ac56 | 616 | } |
8a0dc95f | 617 | |
5503ac56 EVH |
618 | /** |
619 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
620 | * @m: connection to poll | |
621 | * | |
622 | */ | |
623 | ||
624 | static void p9_poll_mux(struct p9_conn *m) | |
625 | { | |
7594bf37 AV |
626 | __poll_t n; |
627 | int err = -ECONNRESET; | |
5503ac56 EVH |
628 | |
629 | if (m->err < 0) | |
630 | return; | |
631 | ||
7594bf37 | 632 | n = p9_fd_poll(m->client, NULL, &err); |
a9a08845 | 633 | if (n & (EPOLLERR | EPOLLHUP | EPOLLNVAL)) { |
5d385153 | 634 | p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
7594bf37 | 635 | p9_conn_cancel(m, err); |
5503ac56 EVH |
636 | } |
637 | ||
a9a08845 | 638 | if (n & EPOLLIN) { |
5503ac56 | 639 | set_bit(Rpending, &m->wsched); |
5d385153 | 640 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 | 641 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 642 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 643 | schedule_work(&m->rq); |
5503ac56 EVH |
644 | } |
645 | } | |
8a0dc95f | 646 | |
a9a08845 | 647 | if (n & EPOLLOUT) { |
5503ac56 | 648 | set_bit(Wpending, &m->wsched); |
5d385153 | 649 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
f64f9e71 JP |
650 | if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
651 | !test_and_set_bit(Wworksched, &m->wsched)) { | |
5d385153 | 652 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
61edeeed | 653 | schedule_work(&m->wq); |
5503ac56 EVH |
654 | } |
655 | } | |
8a0dc95f EVH |
656 | } |
657 | ||
658 | /** | |
91b8534f | 659 | * p9_fd_request - send 9P request |
8a0dc95f EVH |
660 | * The function can sleep until the request is scheduled for sending. |
661 | * The function can be interrupted. Return from the function is not | |
91b8534f | 662 | * a guarantee that the request is sent successfully. |
8a0dc95f | 663 | * |
91b8534f EVH |
664 | * @client: client instance |
665 | * @req: request to be sent | |
ee443996 | 666 | * |
8a0dc95f | 667 | */ |
ee443996 | 668 | |
91b8534f | 669 | static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f | 670 | { |
7594bf37 | 671 | __poll_t n; |
91b8534f | 672 | struct p9_trans_fd *ts = client->trans; |
263c5828 | 673 | struct p9_conn *m = &ts->conn; |
8a0dc95f | 674 | |
5d385153 | 675 | p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", |
523adb6c | 676 | m, current, &req->tc, req->tc.id); |
8a0dc95f | 677 | if (m->err < 0) |
91b8534f | 678 | return m->err; |
8a0dc95f | 679 | |
cc9cde95 | 680 | spin_lock(&m->req_lock); |
7eb923b8 | 681 | req->status = REQ_STATUS_UNSENT; |
8a0dc95f | 682 | list_add_tail(&req->req_list, &m->unsent_req_list); |
cc9cde95 | 683 | spin_unlock(&m->req_lock); |
8a0dc95f EVH |
684 | |
685 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
a9a08845 | 686 | n = EPOLLOUT; |
8a0dc95f | 687 | else |
7594bf37 | 688 | n = p9_fd_poll(m->client, NULL, NULL); |
8a0dc95f | 689 | |
a9a08845 | 690 | if (n & EPOLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) |
61edeeed | 691 | schedule_work(&m->wq); |
8a0dc95f | 692 | |
91b8534f | 693 | return 0; |
8a0dc95f EVH |
694 | } |
695 | ||
91b8534f | 696 | static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f | 697 | { |
cc9cde95 DM |
698 | struct p9_trans_fd *ts = client->trans; |
699 | struct p9_conn *m = &ts->conn; | |
7eb923b8 | 700 | int ret = 1; |
8a0dc95f | 701 | |
5d385153 | 702 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
8a0dc95f | 703 | |
cc9cde95 | 704 | spin_lock(&m->req_lock); |
91b8534f | 705 | |
91b8534f | 706 | if (req->status == REQ_STATUS_UNSENT) { |
1bab88b2 | 707 | list_del(&req->req_list); |
91b8534f | 708 | req->status = REQ_STATUS_FLSHD; |
59d7730c | 709 | p9_req_put(client, req); |
7eb923b8 | 710 | ret = 0; |
0bfd6845 | 711 | } |
cc9cde95 | 712 | spin_unlock(&m->req_lock); |
7eb923b8 EVH |
713 | |
714 | return ret; | |
8a0dc95f EVH |
715 | } |
716 | ||
afd8d654 SD |
717 | static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req) |
718 | { | |
cc9cde95 DM |
719 | struct p9_trans_fd *ts = client->trans; |
720 | struct p9_conn *m = &ts->conn; | |
721 | ||
afd8d654 SD |
722 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
723 | ||
cc9cde95 | 724 | spin_lock(&m->req_lock); |
74d6a5d5 WH |
725 | /* Ignore cancelled request if message has been received |
726 | * before lock. | |
727 | */ | |
728 | if (req->status == REQ_STATUS_RCVD) { | |
cc9cde95 | 729 | spin_unlock(&m->req_lock); |
74d6a5d5 WH |
730 | return 0; |
731 | } | |
732 | ||
afd8d654 SD |
733 | /* we haven't received a response for oldreq, |
734 | * remove it from the list. | |
735 | */ | |
afd8d654 | 736 | list_del(&req->req_list); |
74d6a5d5 | 737 | req->status = REQ_STATUS_FLSHD; |
cc9cde95 DM |
738 | spin_unlock(&m->req_lock); |
739 | ||
59d7730c | 740 | p9_req_put(client, req); |
afd8d654 SD |
741 | |
742 | return 0; | |
743 | } | |
744 | ||
c4fac910 DH |
745 | static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt) |
746 | { | |
747 | if (clnt->trans_mod == &p9_tcp_trans) { | |
748 | if (clnt->trans_opts.tcp.port != P9_PORT) | |
61b272c3 | 749 | seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port); |
c4fac910 DH |
750 | } else if (clnt->trans_mod == &p9_fd_trans) { |
751 | if (clnt->trans_opts.fd.rfd != ~0) | |
61b272c3 | 752 | seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd); |
c4fac910 | 753 | if (clnt->trans_opts.fd.wfd != ~0) |
61b272c3 | 754 | seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd); |
c4fac910 DH |
755 | } |
756 | return 0; | |
757 | } | |
758 | ||
a80d923e | 759 | /** |
0e15597e AK |
760 | * parse_opts - parse mount options into p9_fd_opts structure |
761 | * @params: options string passed from mount | |
762 | * @opts: fd transport-specific structure to parse options into | |
a80d923e | 763 | * |
bb8ffdfc | 764 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 765 | */ |
bd238fb4 | 766 | |
bb8ffdfc | 767 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 768 | { |
a80d923e EVH |
769 | char *p; |
770 | substring_t args[MAX_OPT_ARGS]; | |
771 | int option; | |
d8c8a9e3 | 772 | char *options, *tmp_options; |
bd238fb4 | 773 | |
a80d923e EVH |
774 | opts->port = P9_PORT; |
775 | opts->rfd = ~0; | |
776 | opts->wfd = ~0; | |
c4fac910 | 777 | opts->privport = false; |
bd238fb4 | 778 | |
bb8ffdfc EVH |
779 | if (!params) |
780 | return 0; | |
781 | ||
d8c8a9e3 EVH |
782 | tmp_options = kstrdup(params, GFP_KERNEL); |
783 | if (!tmp_options) { | |
5d385153 JP |
784 | p9_debug(P9_DEBUG_ERROR, |
785 | "failed to allocate copy of option string\n"); | |
bb8ffdfc EVH |
786 | return -ENOMEM; |
787 | } | |
d8c8a9e3 | 788 | options = tmp_options; |
bd238fb4 | 789 | |
a80d923e EVH |
790 | while ((p = strsep(&options, ",")) != NULL) { |
791 | int token; | |
bb8ffdfc | 792 | int r; |
a80d923e EVH |
793 | if (!*p) |
794 | continue; | |
795 | token = match_token(p, tokens, args); | |
2f28c8b3 | 796 | if ((token != Opt_err) && (token != Opt_privport)) { |
15da4b16 AK |
797 | r = match_int(&args[0], &option); |
798 | if (r < 0) { | |
5d385153 JP |
799 | p9_debug(P9_DEBUG_ERROR, |
800 | "integer field, but no integer?\n"); | |
15da4b16 AK |
801 | continue; |
802 | } | |
a80d923e EVH |
803 | } |
804 | switch (token) { | |
805 | case Opt_port: | |
806 | opts->port = option; | |
807 | break; | |
808 | case Opt_rfdno: | |
809 | opts->rfd = option; | |
810 | break; | |
811 | case Opt_wfdno: | |
812 | opts->wfd = option; | |
813 | break; | |
2f28c8b3 | 814 | case Opt_privport: |
c4fac910 | 815 | opts->privport = true; |
2f28c8b3 | 816 | break; |
a80d923e EVH |
817 | default: |
818 | continue; | |
819 | } | |
bd238fb4 | 820 | } |
d8c8a9e3 EVH |
821 | |
822 | kfree(tmp_options); | |
bb8ffdfc | 823 | return 0; |
bd238fb4 | 824 | } |
bd238fb4 | 825 | |
8b81ef58 | 826 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 827 | { |
263c5828 | 828 | struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd), |
a80d923e EVH |
829 | GFP_KERNEL); |
830 | if (!ts) | |
831 | return -ENOMEM; | |
bd238fb4 | 832 | |
a80d923e | 833 | ts->rd = fget(rfd); |
a39c4606 CH |
834 | if (!ts->rd) |
835 | goto out_free_ts; | |
836 | if (!(ts->rd->f_mode & FMODE_READ)) | |
837 | goto out_put_rd; | |
f505c22f TH |
838 | /* prevent workers from hanging on IO when fd is a pipe */ |
839 | ts->rd->f_flags |= O_NONBLOCK; | |
a80d923e | 840 | ts->wr = fget(wfd); |
a39c4606 CH |
841 | if (!ts->wr) |
842 | goto out_put_rd; | |
843 | if (!(ts->wr->f_mode & FMODE_WRITE)) | |
844 | goto out_put_wr; | |
f505c22f | 845 | ts->wr->f_flags |= O_NONBLOCK; |
bd238fb4 | 846 | |
8b81ef58 EVH |
847 | client->trans = ts; |
848 | client->status = Connected; | |
bd238fb4 | 849 | |
a80d923e | 850 | return 0; |
a39c4606 CH |
851 | |
852 | out_put_wr: | |
853 | fput(ts->wr); | |
854 | out_put_rd: | |
855 | fput(ts->rd); | |
856 | out_free_ts: | |
857 | kfree(ts); | |
858 | return -EIO; | |
bd238fb4 | 859 | } |
bd238fb4 | 860 | |
8b81ef58 | 861 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 | 862 | { |
6b18662e | 863 | struct p9_trans_fd *p; |
56b31d1c | 864 | struct file *file; |
6b18662e | 865 | |
263c5828 | 866 | p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); |
a0dc0338 WH |
867 | if (!p) { |
868 | sock_release(csocket); | |
6b18662e | 869 | return -ENOMEM; |
a0dc0338 | 870 | } |
bd238fb4 LI |
871 | |
872 | csocket->sk->sk_allocation = GFP_NOIO; | |
aab174f0 | 873 | file = sock_alloc_file(csocket, 0, NULL); |
56b31d1c | 874 | if (IS_ERR(file)) { |
5d385153 JP |
875 | pr_err("%s (%d): failed to map fd\n", |
876 | __func__, task_pid_nr(current)); | |
6b18662e | 877 | kfree(p); |
56b31d1c | 878 | return PTR_ERR(file); |
bd238fb4 LI |
879 | } |
880 | ||
56b31d1c AV |
881 | get_file(file); |
882 | p->wr = p->rd = file; | |
6b18662e AV |
883 | client->trans = p; |
884 | client->status = Connected; | |
885 | ||
6b18662e AV |
886 | p->rd->f_flags |= O_NONBLOCK; |
887 | ||
263c5828 | 888 | p9_conn_create(client); |
bd238fb4 LI |
889 | return 0; |
890 | } | |
891 | ||
bd238fb4 | 892 | /** |
54e625e3 | 893 | * p9_conn_destroy - cancels all pending requests of mux |
5503ac56 | 894 | * @m: mux to destroy |
bd238fb4 LI |
895 | * |
896 | */ | |
ee443996 | 897 | |
5503ac56 | 898 | static void p9_conn_destroy(struct p9_conn *m) |
bd238fb4 | 899 | { |
5d385153 JP |
900 | p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", |
901 | m, m->mux_list.prev, m->mux_list.next); | |
bd238fb4 | 902 | |
5503ac56 EVH |
903 | p9_mux_poll_stop(m); |
904 | cancel_work_sync(&m->rq); | |
fb488fc1 | 905 | if (m->rreq) { |
59d7730c | 906 | p9_req_put(m->client, m->rreq); |
fb488fc1 DM |
907 | m->rreq = NULL; |
908 | } | |
5503ac56 | 909 | cancel_work_sync(&m->wq); |
fb488fc1 | 910 | if (m->wreq) { |
59d7730c | 911 | p9_req_put(m->client, m->wreq); |
fb488fc1 DM |
912 | m->wreq = NULL; |
913 | } | |
bd238fb4 | 914 | |
5503ac56 | 915 | p9_conn_cancel(m, -ECONNRESET); |
bd238fb4 | 916 | |
5503ac56 | 917 | m->client = NULL; |
bd238fb4 LI |
918 | } |
919 | ||
920 | /** | |
8b81ef58 EVH |
921 | * p9_fd_close - shutdown file descriptor transport |
922 | * @client: client instance | |
bd238fb4 LI |
923 | * |
924 | */ | |
ee443996 | 925 | |
8b81ef58 | 926 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
927 | { |
928 | struct p9_trans_fd *ts; | |
929 | ||
8b81ef58 | 930 | if (!client) |
bd238fb4 LI |
931 | return; |
932 | ||
8b81ef58 | 933 | ts = client->trans; |
bd238fb4 LI |
934 | if (!ts) |
935 | return; | |
936 | ||
8b81ef58 EVH |
937 | client->status = Disconnected; |
938 | ||
263c5828 | 939 | p9_conn_destroy(&ts->conn); |
8a0dc95f | 940 | |
bd238fb4 LI |
941 | if (ts->rd) |
942 | fput(ts->rd); | |
943 | if (ts->wr) | |
944 | fput(ts->wr); | |
8b81ef58 | 945 | |
bd238fb4 LI |
946 | kfree(ts); |
947 | } | |
948 | ||
887b3ece EVH |
949 | /* |
950 | * stolen from NFS - maybe should be made a generic function? | |
951 | */ | |
952 | static inline int valid_ipaddr4(const char *buf) | |
953 | { | |
954 | int rc, count, in[4]; | |
955 | ||
956 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
957 | if (rc != 4) | |
958 | return -EINVAL; | |
959 | for (count = 0; count < 4; count++) { | |
960 | if (in[count] > 255) | |
961 | return -EINVAL; | |
962 | } | |
963 | return 0; | |
964 | } | |
965 | ||
2f28c8b3 JG |
966 | static int p9_bind_privport(struct socket *sock) |
967 | { | |
968 | struct sockaddr_in cl; | |
969 | int port, err = -EINVAL; | |
970 | ||
971 | memset(&cl, 0, sizeof(cl)); | |
972 | cl.sin_family = AF_INET; | |
6db6ea79 | 973 | cl.sin_addr.s_addr = htonl(INADDR_ANY); |
2f28c8b3 JG |
974 | for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { |
975 | cl.sin_port = htons((ushort)port); | |
976 | err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl)); | |
977 | if (err != -EADDRINUSE) | |
978 | break; | |
979 | } | |
980 | return err; | |
981 | } | |
982 | ||
983 | ||
8b81ef58 EVH |
984 | static int |
985 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
986 | { |
987 | int err; | |
a80d923e EVH |
988 | struct socket *csocket; |
989 | struct sockaddr_in sin_server; | |
990 | struct p9_fd_opts opts; | |
991 | ||
bb8ffdfc EVH |
992 | err = parse_opts(args, &opts); |
993 | if (err < 0) | |
8b81ef58 | 994 | return err; |
a80d923e | 995 | |
10aa1452 | 996 | if (addr == NULL || valid_ipaddr4(addr) < 0) |
8b81ef58 | 997 | return -EINVAL; |
887b3ece | 998 | |
a80d923e | 999 | csocket = NULL; |
a80d923e | 1000 | |
c4fac910 DH |
1001 | client->trans_opts.tcp.port = opts.port; |
1002 | client->trans_opts.tcp.privport = opts.privport; | |
a80d923e EVH |
1003 | sin_server.sin_family = AF_INET; |
1004 | sin_server.sin_addr.s_addr = in_aton(addr); | |
1005 | sin_server.sin_port = htons(opts.port); | |
0c5c9fb5 | 1006 | err = __sock_create(current->nsproxy->net_ns, PF_INET, |
e75762fd | 1007 | SOCK_STREAM, IPPROTO_TCP, &csocket, 1); |
6b18662e | 1008 | if (err) { |
5d385153 JP |
1009 | pr_err("%s (%d): problem creating socket\n", |
1010 | __func__, task_pid_nr(current)); | |
6b18662e | 1011 | return err; |
a80d923e EVH |
1012 | } |
1013 | ||
2f28c8b3 JG |
1014 | if (opts.privport) { |
1015 | err = p9_bind_privport(csocket); | |
1016 | if (err < 0) { | |
1017 | pr_err("%s (%d): problem binding to privport\n", | |
1018 | __func__, task_pid_nr(current)); | |
1019 | sock_release(csocket); | |
1020 | return err; | |
1021 | } | |
1022 | } | |
1023 | ||
a80d923e EVH |
1024 | err = csocket->ops->connect(csocket, |
1025 | (struct sockaddr *)&sin_server, | |
1026 | sizeof(struct sockaddr_in), 0); | |
1027 | if (err < 0) { | |
5d385153 JP |
1028 | pr_err("%s (%d): problem connecting socket to %s\n", |
1029 | __func__, task_pid_nr(current), addr); | |
a80d923e | 1030 | sock_release(csocket); |
6b18662e AV |
1031 | return err; |
1032 | } | |
a80d923e | 1033 | |
6b18662e | 1034 | return p9_socket_open(client, csocket); |
a80d923e EVH |
1035 | } |
1036 | ||
8b81ef58 EVH |
1037 | static int |
1038 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1039 | { |
1040 | int err; | |
1041 | struct socket *csocket; | |
1042 | struct sockaddr_un sun_server; | |
a80d923e EVH |
1043 | |
1044 | csocket = NULL; | |
a80d923e | 1045 | |
7ca1db21 | 1046 | if (!addr || !strlen(addr)) |
10aa1452 TB |
1047 | return -EINVAL; |
1048 | ||
cff6b8a9 | 1049 | if (strlen(addr) >= UNIX_PATH_MAX) { |
5d385153 JP |
1050 | pr_err("%s (%d): address too long: %s\n", |
1051 | __func__, task_pid_nr(current), addr); | |
6b18662e | 1052 | return -ENAMETOOLONG; |
a80d923e EVH |
1053 | } |
1054 | ||
1055 | sun_server.sun_family = PF_UNIX; | |
1056 | strcpy(sun_server.sun_path, addr); | |
0c5c9fb5 | 1057 | err = __sock_create(current->nsproxy->net_ns, PF_UNIX, |
e75762fd | 1058 | SOCK_STREAM, 0, &csocket, 1); |
6b18662e | 1059 | if (err < 0) { |
5d385153 JP |
1060 | pr_err("%s (%d): problem creating socket\n", |
1061 | __func__, task_pid_nr(current)); | |
1062 | ||
6b18662e AV |
1063 | return err; |
1064 | } | |
a80d923e EVH |
1065 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
1066 | sizeof(struct sockaddr_un) - 1, 0); | |
1067 | if (err < 0) { | |
5d385153 JP |
1068 | pr_err("%s (%d): problem connecting socket: %s: %d\n", |
1069 | __func__, task_pid_nr(current), addr, err); | |
a80d923e | 1070 | sock_release(csocket); |
6b18662e AV |
1071 | return err; |
1072 | } | |
a80d923e | 1073 | |
6b18662e | 1074 | return p9_socket_open(client, csocket); |
a80d923e EVH |
1075 | } |
1076 | ||
8b81ef58 EVH |
1077 | static int |
1078 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1079 | { |
1080 | int err; | |
a80d923e EVH |
1081 | struct p9_fd_opts opts; |
1082 | ||
1083 | parse_opts(args, &opts); | |
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, | |
f94741fd | 1104 | .def = 0, |
8b81ef58 EVH |
1105 | .create = p9_fd_create_tcp, |
1106 | .close = p9_fd_close, | |
91b8534f EVH |
1107 | .request = p9_fd_request, |
1108 | .cancel = p9_fd_cancel, | |
afd8d654 | 1109 | .cancelled = p9_fd_cancelled, |
c4fac910 | 1110 | .show_options = p9_fd_show_options, |
72029fe8 | 1111 | .owner = THIS_MODULE, |
a80d923e EVH |
1112 | }; |
1113 | ||
1114 | static struct p9_trans_module p9_unix_trans = { | |
1115 | .name = "unix", | |
1116 | .maxsize = MAX_SOCK_BUF, | |
1117 | .def = 0, | |
8b81ef58 EVH |
1118 | .create = p9_fd_create_unix, |
1119 | .close = p9_fd_close, | |
91b8534f EVH |
1120 | .request = p9_fd_request, |
1121 | .cancel = p9_fd_cancel, | |
afd8d654 | 1122 | .cancelled = p9_fd_cancelled, |
c4fac910 | 1123 | .show_options = p9_fd_show_options, |
72029fe8 | 1124 | .owner = THIS_MODULE, |
a80d923e EVH |
1125 | }; |
1126 | ||
1127 | static struct p9_trans_module p9_fd_trans = { | |
1128 | .name = "fd", | |
1129 | .maxsize = MAX_SOCK_BUF, | |
1130 | .def = 0, | |
8b81ef58 EVH |
1131 | .create = p9_fd_create, |
1132 | .close = p9_fd_close, | |
91b8534f EVH |
1133 | .request = p9_fd_request, |
1134 | .cancel = p9_fd_cancel, | |
afd8d654 | 1135 | .cancelled = p9_fd_cancelled, |
c4fac910 | 1136 | .show_options = p9_fd_show_options, |
72029fe8 | 1137 | .owner = THIS_MODULE, |
a80d923e EVH |
1138 | }; |
1139 | ||
5503ac56 | 1140 | /** |
4a026da9 SL |
1141 | * p9_poll_workfn - poll worker thread |
1142 | * @work: work queue | |
5503ac56 EVH |
1143 | * |
1144 | * polls all v9fs transports for new events and queues the appropriate | |
1145 | * work to the work queue | |
1146 | * | |
1147 | */ | |
1148 | ||
aa70c585 | 1149 | static void p9_poll_workfn(struct work_struct *work) |
5503ac56 EVH |
1150 | { |
1151 | unsigned long flags; | |
1152 | ||
5d385153 | 1153 | p9_debug(P9_DEBUG_TRANS, "start %p\n", current); |
aa70c585 | 1154 | |
5503ac56 EVH |
1155 | spin_lock_irqsave(&p9_poll_lock, flags); |
1156 | while (!list_empty(&p9_poll_pending_list)) { | |
1157 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
1158 | struct p9_conn, | |
1159 | poll_pending_link); | |
1160 | list_del_init(&conn->poll_pending_link); | |
1161 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1162 | ||
1163 | p9_poll_mux(conn); | |
1164 | ||
1165 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1166 | } | |
1167 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1168 | ||
5d385153 | 1169 | p9_debug(P9_DEBUG_TRANS, "finish\n"); |
5503ac56 EVH |
1170 | } |
1171 | ||
887b3ece | 1172 | int p9_trans_fd_init(void) |
a80d923e EVH |
1173 | { |
1174 | v9fs_register_trans(&p9_tcp_trans); | |
1175 | v9fs_register_trans(&p9_unix_trans); | |
1176 | v9fs_register_trans(&p9_fd_trans); | |
1177 | ||
3387b804 | 1178 | return 0; |
a80d923e | 1179 | } |
72029fe8 TH |
1180 | |
1181 | void p9_trans_fd_exit(void) | |
1182 | { | |
43829731 | 1183 | flush_work(&p9_poll_work); |
72029fe8 TH |
1184 | v9fs_unregister_trans(&p9_tcp_trans); |
1185 | v9fs_unregister_trans(&p9_unix_trans); | |
1186 | v9fs_unregister_trans(&p9_fd_trans); | |
1187 | } |