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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/net/sunrpc/svc.c
3 *
4 * High-level RPC service routines
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
Greg Banksbfd24162006-10-02 02:18:01 -07007 *
8 * Multiple threads pools and NUMAisation
9 * Copyright (c) 2006 Silicon Graphics, Inc.
10 * by Greg Banks <gnb@melbourne.sgi.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12
13#include <linux/linkage.h>
14#include <linux/sched.h>
15#include <linux/errno.h>
16#include <linux/net.h>
17#include <linux/in.h>
18#include <linux/mm.h>
Greg Banksa7455442006-10-02 02:17:59 -070019#include <linux/interrupt.h>
20#include <linux/module.h>
Jeff Layton9867d762008-06-10 08:40:38 -040021#include <linux/kthread.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include <linux/sunrpc/types.h>
25#include <linux/sunrpc/xdr.h>
26#include <linux/sunrpc/stats.h>
27#include <linux/sunrpc/svcsock.h>
28#include <linux/sunrpc/clnt.h>
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -040029#include <linux/sunrpc/bc_xprt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Jeff Layton860a0d92014-10-28 14:24:12 -040031#include <trace/events/sunrpc.h>
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#define RPCDBG_FACILITY RPCDBG_SVCDSP
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +040035static void svc_unregister(const struct svc_serv *serv, struct net *net);
Chuck Lever7252d572008-08-18 19:34:08 -040036
Jeff Laytonc3690142015-06-08 12:04:46 -070037#define svc_serv_is_pooled(serv) ((serv)->sv_ops->svo_function)
Greg Banks42a7fc42007-03-06 01:42:23 -080038
Greg Banks42a7fc42007-03-06 01:42:23 -080039#define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
Greg Banksbfd24162006-10-02 02:18:01 -070040
41/*
42 * Structure for mapping cpus to pools and vice versa.
43 * Setup once during sunrpc initialisation.
44 */
Jeff Laytond70bc0c2015-06-08 12:09:54 -070045struct svc_pool_map svc_pool_map = {
Greg Banks42a7fc42007-03-06 01:42:23 -080046 .mode = SVC_POOL_DEFAULT
Greg Banksbfd24162006-10-02 02:18:01 -070047};
Jeff Laytond70bc0c2015-06-08 12:09:54 -070048EXPORT_SYMBOL_GPL(svc_pool_map);
49
Greg Banks42a7fc42007-03-06 01:42:23 -080050static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
Greg Banksbfd24162006-10-02 02:18:01 -070051
Greg Banks42a7fc42007-03-06 01:42:23 -080052static int
53param_set_pool_mode(const char *val, struct kernel_param *kp)
54{
55 int *ip = (int *)kp->arg;
56 struct svc_pool_map *m = &svc_pool_map;
57 int err;
58
59 mutex_lock(&svc_pool_map_mutex);
60
61 err = -EBUSY;
62 if (m->count)
63 goto out;
64
65 err = 0;
66 if (!strncmp(val, "auto", 4))
67 *ip = SVC_POOL_AUTO;
68 else if (!strncmp(val, "global", 6))
69 *ip = SVC_POOL_GLOBAL;
70 else if (!strncmp(val, "percpu", 6))
71 *ip = SVC_POOL_PERCPU;
72 else if (!strncmp(val, "pernode", 7))
73 *ip = SVC_POOL_PERNODE;
74 else
75 err = -EINVAL;
76
77out:
78 mutex_unlock(&svc_pool_map_mutex);
79 return err;
80}
81
82static int
83param_get_pool_mode(char *buf, struct kernel_param *kp)
84{
85 int *ip = (int *)kp->arg;
86
87 switch (*ip)
88 {
89 case SVC_POOL_AUTO:
90 return strlcpy(buf, "auto", 20);
91 case SVC_POOL_GLOBAL:
92 return strlcpy(buf, "global", 20);
93 case SVC_POOL_PERCPU:
94 return strlcpy(buf, "percpu", 20);
95 case SVC_POOL_PERNODE:
96 return strlcpy(buf, "pernode", 20);
97 default:
98 return sprintf(buf, "%d", *ip);
99 }
100}
101
102module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
103 &svc_pool_map.mode, 0644);
Greg Banksbfd24162006-10-02 02:18:01 -0700104
105/*
106 * Detect best pool mapping mode heuristically,
107 * according to the machine's topology.
108 */
109static int
110svc_pool_map_choose_mode(void)
111{
112 unsigned int node;
113
Christoph Lameter62bc62a2009-06-16 15:32:15 -0700114 if (nr_online_nodes > 1) {
Greg Banksbfd24162006-10-02 02:18:01 -0700115 /*
116 * Actually have multiple NUMA nodes,
117 * so split pools on NUMA node boundaries
118 */
119 return SVC_POOL_PERNODE;
120 }
121
H Hartley Sweeten72c33682010-03-05 13:42:43 -0800122 node = first_online_node;
Greg Banksbfd24162006-10-02 02:18:01 -0700123 if (nr_cpus_node(node) > 2) {
124 /*
125 * Non-trivial SMP, or CONFIG_NUMA on
126 * non-NUMA hardware, e.g. with a generic
127 * x86_64 kernel on Xeons. In this case we
128 * want to divide the pools on cpu boundaries.
129 */
130 return SVC_POOL_PERCPU;
131 }
132
133 /* default: one global pool */
134 return SVC_POOL_GLOBAL;
135}
136
137/*
138 * Allocate the to_pool[] and pool_to[] arrays.
139 * Returns 0 on success or an errno.
140 */
141static int
142svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
143{
144 m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
145 if (!m->to_pool)
146 goto fail;
147 m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
148 if (!m->pool_to)
149 goto fail_free;
150
151 return 0;
152
153fail_free:
154 kfree(m->to_pool);
J. Bruce Fields61c85042011-12-22 18:22:49 -0700155 m->to_pool = NULL;
Greg Banksbfd24162006-10-02 02:18:01 -0700156fail:
157 return -ENOMEM;
158}
159
160/*
161 * Initialise the pool map for SVC_POOL_PERCPU mode.
162 * Returns number of pools or <0 on error.
163 */
164static int
165svc_pool_map_init_percpu(struct svc_pool_map *m)
166{
Christoph Lameter53b8a312007-02-20 13:57:51 -0800167 unsigned int maxpools = nr_cpu_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700168 unsigned int pidx = 0;
169 unsigned int cpu;
170 int err;
171
172 err = svc_pool_map_alloc_arrays(m, maxpools);
173 if (err)
174 return err;
175
176 for_each_online_cpu(cpu) {
Dan Carpentereb631922014-10-29 11:44:16 +0300177 BUG_ON(pidx >= maxpools);
Greg Banksbfd24162006-10-02 02:18:01 -0700178 m->to_pool[cpu] = pidx;
179 m->pool_to[pidx] = cpu;
180 pidx++;
181 }
182 /* cpus brought online later all get mapped to pool0, sorry */
183
184 return pidx;
185};
186
187
188/*
189 * Initialise the pool map for SVC_POOL_PERNODE mode.
190 * Returns number of pools or <0 on error.
191 */
192static int
193svc_pool_map_init_pernode(struct svc_pool_map *m)
194{
Christoph Lameter74c7aa82007-02-20 13:57:51 -0800195 unsigned int maxpools = nr_node_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700196 unsigned int pidx = 0;
197 unsigned int node;
198 int err;
199
200 err = svc_pool_map_alloc_arrays(m, maxpools);
201 if (err)
202 return err;
203
204 for_each_node_with_cpus(node) {
205 /* some architectures (e.g. SN2) have cpuless nodes */
206 BUG_ON(pidx > maxpools);
207 m->to_pool[node] = pidx;
208 m->pool_to[pidx] = node;
209 pidx++;
210 }
211 /* nodes brought online later all get mapped to pool0, sorry */
212
213 return pidx;
214}
215
216
217/*
Greg Banks42a7fc42007-03-06 01:42:23 -0800218 * Add a reference to the global map of cpus to pools (and
219 * vice versa). Initialise the map if we're the first user.
220 * Returns the number of pools.
Greg Banksbfd24162006-10-02 02:18:01 -0700221 */
Jeff Laytond70bc0c2015-06-08 12:09:54 -0700222unsigned int
Greg Banks42a7fc42007-03-06 01:42:23 -0800223svc_pool_map_get(void)
Greg Banksbfd24162006-10-02 02:18:01 -0700224{
225 struct svc_pool_map *m = &svc_pool_map;
226 int npools = -1;
227
Greg Banks42a7fc42007-03-06 01:42:23 -0800228 mutex_lock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700229
Greg Banks42a7fc42007-03-06 01:42:23 -0800230 if (m->count++) {
231 mutex_unlock(&svc_pool_map_mutex);
232 return m->npools;
233 }
234
235 if (m->mode == SVC_POOL_AUTO)
236 m->mode = svc_pool_map_choose_mode();
Greg Banksbfd24162006-10-02 02:18:01 -0700237
238 switch (m->mode) {
239 case SVC_POOL_PERCPU:
240 npools = svc_pool_map_init_percpu(m);
241 break;
242 case SVC_POOL_PERNODE:
243 npools = svc_pool_map_init_pernode(m);
244 break;
245 }
246
247 if (npools < 0) {
248 /* default, or memory allocation failure */
249 npools = 1;
250 m->mode = SVC_POOL_GLOBAL;
251 }
252 m->npools = npools;
253
Greg Banks42a7fc42007-03-06 01:42:23 -0800254 mutex_unlock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700255 return m->npools;
256}
Jeff Laytond70bc0c2015-06-08 12:09:54 -0700257EXPORT_SYMBOL_GPL(svc_pool_map_get);
Greg Banks42a7fc42007-03-06 01:42:23 -0800258
259/*
260 * Drop a reference to the global map of cpus to pools.
261 * When the last reference is dropped, the map data is
262 * freed; this allows the sysadmin to change the pool
263 * mode using the pool_mode module option without
264 * rebooting or re-loading sunrpc.ko.
265 */
Jeff Laytond70bc0c2015-06-08 12:09:54 -0700266void
Greg Banks42a7fc42007-03-06 01:42:23 -0800267svc_pool_map_put(void)
268{
269 struct svc_pool_map *m = &svc_pool_map;
270
271 mutex_lock(&svc_pool_map_mutex);
272
273 if (!--m->count) {
Greg Banks42a7fc42007-03-06 01:42:23 -0800274 kfree(m->to_pool);
J. Bruce Fields61c85042011-12-22 18:22:49 -0700275 m->to_pool = NULL;
Greg Banks42a7fc42007-03-06 01:42:23 -0800276 kfree(m->pool_to);
J. Bruce Fields61c85042011-12-22 18:22:49 -0700277 m->pool_to = NULL;
Greg Banks42a7fc42007-03-06 01:42:23 -0800278 m->npools = 0;
279 }
280
281 mutex_unlock(&svc_pool_map_mutex);
282}
Jeff Laytond70bc0c2015-06-08 12:09:54 -0700283EXPORT_SYMBOL_GPL(svc_pool_map_put);
Greg Banks42a7fc42007-03-06 01:42:23 -0800284
Eric Dumazet11fd1652011-07-28 20:04:09 +0200285static int svc_pool_map_get_node(unsigned int pidx)
286{
287 const struct svc_pool_map *m = &svc_pool_map;
288
289 if (m->count) {
290 if (m->mode == SVC_POOL_PERCPU)
291 return cpu_to_node(m->pool_to[pidx]);
292 if (m->mode == SVC_POOL_PERNODE)
293 return m->pool_to[pidx];
294 }
295 return NUMA_NO_NODE;
296}
Greg Banksbfd24162006-10-02 02:18:01 -0700297/*
Jeff Layton9867d762008-06-10 08:40:38 -0400298 * Set the given thread's cpus_allowed mask so that it
Greg Banksbfd24162006-10-02 02:18:01 -0700299 * will only run on cpus in the given pool.
Greg Banksbfd24162006-10-02 02:18:01 -0700300 */
Jeff Layton9867d762008-06-10 08:40:38 -0400301static inline void
302svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
Greg Banksbfd24162006-10-02 02:18:01 -0700303{
304 struct svc_pool_map *m = &svc_pool_map;
Jeff Layton9867d762008-06-10 08:40:38 -0400305 unsigned int node = m->pool_to[pidx];
Greg Banksbfd24162006-10-02 02:18:01 -0700306
307 /*
308 * The caller checks for sv_nrpools > 1, which
Greg Banks42a7fc42007-03-06 01:42:23 -0800309 * implies that we've been initialized.
Greg Banksbfd24162006-10-02 02:18:01 -0700310 */
Weston Andros Adamson1bd58aa2012-10-23 10:43:38 -0400311 WARN_ON_ONCE(m->count == 0);
312 if (m->count == 0)
313 return;
Greg Banksbfd24162006-10-02 02:18:01 -0700314
Jeff Layton9867d762008-06-10 08:40:38 -0400315 switch (m->mode) {
Greg Banksbfd24162006-10-02 02:18:01 -0700316 case SVC_POOL_PERCPU:
Mike Travisc5f59f02008-04-04 18:11:10 -0700317 {
Rusty Russellaa85ea52009-03-30 22:05:15 -0600318 set_cpus_allowed_ptr(task, cpumask_of(node));
Jeff Layton9867d762008-06-10 08:40:38 -0400319 break;
Mike Travisc5f59f02008-04-04 18:11:10 -0700320 }
Greg Banksbfd24162006-10-02 02:18:01 -0700321 case SVC_POOL_PERNODE:
Mike Travisc5f59f02008-04-04 18:11:10 -0700322 {
Rusty Russella70f7302009-03-13 14:49:46 +1030323 set_cpus_allowed_ptr(task, cpumask_of_node(node));
Jeff Layton9867d762008-06-10 08:40:38 -0400324 break;
Greg Banksbfd24162006-10-02 02:18:01 -0700325 }
Mike Travisc5f59f02008-04-04 18:11:10 -0700326 }
Greg Banksbfd24162006-10-02 02:18:01 -0700327}
328
329/*
330 * Use the mapping mode to choose a pool for a given CPU.
331 * Used when enqueueing an incoming RPC. Always returns
332 * a non-NULL pool pointer.
333 */
334struct svc_pool *
335svc_pool_for_cpu(struct svc_serv *serv, int cpu)
336{
337 struct svc_pool_map *m = &svc_pool_map;
338 unsigned int pidx = 0;
339
340 /*
Greg Banks42a7fc42007-03-06 01:42:23 -0800341 * An uninitialised map happens in a pure client when
Greg Banksbfd24162006-10-02 02:18:01 -0700342 * lockd is brought up, so silently treat it the
343 * same as SVC_POOL_GLOBAL.
344 */
Greg Banks42a7fc42007-03-06 01:42:23 -0800345 if (svc_serv_is_pooled(serv)) {
346 switch (m->mode) {
347 case SVC_POOL_PERCPU:
348 pidx = m->to_pool[cpu];
349 break;
350 case SVC_POOL_PERNODE:
351 pidx = m->to_pool[cpu_to_node(cpu)];
352 break;
353 }
Greg Banksbfd24162006-10-02 02:18:01 -0700354 }
355 return &serv->sv_pools[pidx % serv->sv_nrpools];
356}
357
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400358int svc_rpcb_setup(struct svc_serv *serv, struct net *net)
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300359{
360 int err;
361
Stanislav Kinsburskybee42f682012-01-13 14:02:56 +0400362 err = rpcb_create_local(net);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300363 if (err)
364 return err;
365
366 /* Remove any stale portmap registrations */
Stanislav Kinsburskybee42f682012-01-13 14:02:56 +0400367 svc_unregister(serv, net);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300368 return 0;
369}
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400370EXPORT_SYMBOL_GPL(svc_rpcb_setup);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300371
Stanislav Kinsbursky5ecebb72012-01-13 14:03:04 +0400372void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net)
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300373{
Stanislav Kinsbursky5ecebb72012-01-13 14:03:04 +0400374 svc_unregister(serv, net);
375 rpcb_put_local(net);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300376}
Stanislav Kinsbursky16d05872011-10-25 14:17:28 +0300377EXPORT_SYMBOL_GPL(svc_rpcb_cleanup);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300378
379static int svc_uses_rpcbind(struct svc_serv *serv)
380{
381 struct svc_program *progp;
382 unsigned int i;
383
384 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
385 for (i = 0; i < progp->pg_nvers; i++) {
386 if (progp->pg_vers[i] == NULL)
387 continue;
388 if (progp->pg_vers[i]->vs_hidden == 0)
389 return 1;
390 }
391 }
392
393 return 0;
394}
Greg Banksbfd24162006-10-02 02:18:01 -0700395
Stanislav Kinsbursky9793f7c2012-05-02 16:08:38 +0400396int svc_bind(struct svc_serv *serv, struct net *net)
397{
398 if (!svc_uses_rpcbind(serv))
399 return 0;
400 return svc_rpcb_setup(serv, net);
401}
402EXPORT_SYMBOL_GPL(svc_bind);
403
Greg Banksbfd24162006-10-02 02:18:01 -0700404/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 * Create an RPC service
406 */
Greg Banksa7455442006-10-02 02:17:59 -0700407static struct svc_serv *
408__svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
Jeff Laytonea126e72015-06-08 12:03:32 -0700409 struct svc_serv_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
411 struct svc_serv *serv;
Chuck Leverea339d42007-10-26 13:32:56 -0400412 unsigned int vers;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 unsigned int xdrsize;
Greg Banks3262c812006-10-02 02:17:58 -0700414 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700416 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 return NULL;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000418 serv->sv_name = prog->pg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 serv->sv_program = prog;
420 serv->sv_nrthreads = 1;
421 serv->sv_stats = prog->pg_stats;
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700422 if (bufsize > RPCSVC_MAXPAYLOAD)
423 bufsize = RPCSVC_MAXPAYLOAD;
424 serv->sv_max_payload = bufsize? bufsize : 4096;
425 serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
Jeff Laytonea126e72015-06-08 12:03:32 -0700426 serv->sv_ops = ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 xdrsize = 0;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000428 while (prog) {
429 prog->pg_lovers = prog->pg_nvers-1;
430 for (vers=0; vers<prog->pg_nvers ; vers++)
431 if (prog->pg_vers[vers]) {
432 prog->pg_hivers = vers;
433 if (prog->pg_lovers > vers)
434 prog->pg_lovers = vers;
435 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
436 xdrsize = prog->pg_vers[vers]->vs_xdrsize;
437 }
438 prog = prog->pg_next;
439 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 serv->sv_xdrsize = xdrsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 INIT_LIST_HEAD(&serv->sv_tempsocks);
442 INIT_LIST_HEAD(&serv->sv_permsocks);
Greg Banks36bdfc82006-10-02 02:17:54 -0700443 init_timer(&serv->sv_temptimer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 spin_lock_init(&serv->sv_lock);
445
Greg Banksa7455442006-10-02 02:17:59 -0700446 serv->sv_nrpools = npools;
Greg Banks3262c812006-10-02 02:17:58 -0700447 serv->sv_pools =
Robert P. J. Daycd861282006-12-13 00:34:52 -0800448 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
Greg Banks3262c812006-10-02 02:17:58 -0700449 GFP_KERNEL);
450 if (!serv->sv_pools) {
451 kfree(serv);
452 return NULL;
453 }
454
455 for (i = 0; i < serv->sv_nrpools; i++) {
456 struct svc_pool *pool = &serv->sv_pools[i];
457
Chuck Lever46121cf2007-01-31 12:14:08 -0500458 dprintk("svc: initialising pool %u for %s\n",
Greg Banks3262c812006-10-02 02:17:58 -0700459 i, serv->sv_name);
460
461 pool->sp_id = i;
Greg Banks3262c812006-10-02 02:17:58 -0700462 INIT_LIST_HEAD(&pool->sp_sockets);
Greg Banksa7455442006-10-02 02:17:59 -0700463 INIT_LIST_HEAD(&pool->sp_all_threads);
Greg Banks3262c812006-10-02 02:17:58 -0700464 spin_lock_init(&pool->sp_lock);
465 }
466
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 return serv;
468}
469
Greg Banksa7455442006-10-02 02:17:59 -0700470struct svc_serv *
471svc_create(struct svc_program *prog, unsigned int bufsize,
Jeff Laytonea126e72015-06-08 12:03:32 -0700472 struct svc_serv_ops *ops)
Greg Banksa7455442006-10-02 02:17:59 -0700473{
Jeff Laytonea126e72015-06-08 12:03:32 -0700474 return __svc_create(prog, bufsize, /*npools*/1, ops);
Greg Banksa7455442006-10-02 02:17:59 -0700475}
Trond Myklebust24c37672008-12-23 16:30:12 -0500476EXPORT_SYMBOL_GPL(svc_create);
Greg Banksa7455442006-10-02 02:17:59 -0700477
478struct svc_serv *
479svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
Jeff Layton758f62f2015-06-08 12:05:56 -0700480 struct svc_serv_ops *ops)
Greg Banksa7455442006-10-02 02:17:59 -0700481{
482 struct svc_serv *serv;
Greg Banks42a7fc42007-03-06 01:42:23 -0800483 unsigned int npools = svc_pool_map_get();
Greg Banksa7455442006-10-02 02:17:59 -0700484
Jeff Laytonea126e72015-06-08 12:03:32 -0700485 serv = __svc_create(prog, bufsize, npools, ops);
Jeff Layton067f96e2014-11-19 07:51:13 -0500486 if (!serv)
487 goto out_err;
Greg Banksa7455442006-10-02 02:17:59 -0700488 return serv;
Jeff Layton067f96e2014-11-19 07:51:13 -0500489out_err:
490 svc_pool_map_put();
491 return NULL;
Greg Banksa7455442006-10-02 02:17:59 -0700492}
Trond Myklebust24c37672008-12-23 16:30:12 -0500493EXPORT_SYMBOL_GPL(svc_create_pooled);
Greg Banksa7455442006-10-02 02:17:59 -0700494
Stanislav Kinsbursky074d0f62012-01-31 14:09:25 +0400495void svc_shutdown_net(struct svc_serv *serv, struct net *net)
496{
Stanislav Kinsbursky074d0f62012-01-31 14:09:25 +0400497 svc_close_net(serv, net);
498
Jeff Laytonea126e72015-06-08 12:03:32 -0700499 if (serv->sv_ops->svo_shutdown)
500 serv->sv_ops->svo_shutdown(serv, net);
Stanislav Kinsbursky074d0f62012-01-31 14:09:25 +0400501}
502EXPORT_SYMBOL_GPL(svc_shutdown_net);
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504/*
Neil Brownbedbdd82008-06-10 08:40:35 -0400505 * Destroy an RPC service. Should be called with appropriate locking to
506 * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 */
508void
509svc_destroy(struct svc_serv *serv)
510{
Chuck Lever46121cf2007-01-31 12:14:08 -0500511 dprintk("svc: svc_destroy(%s, %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 serv->sv_program->pg_name,
513 serv->sv_nrthreads);
514
515 if (serv->sv_nrthreads) {
516 if (--(serv->sv_nrthreads) != 0) {
517 svc_sock_update_bufs(serv);
518 return;
519 }
520 } else
521 printk("svc_destroy: no threads for serv=%p!\n", serv);
522
Greg Banks36bdfc82006-10-02 02:17:54 -0700523 del_timer_sync(&serv->sv_temptimer);
Stanislav Kinsbursky074d0f62012-01-31 14:09:25 +0400524
Stanislav Kinsbursky7b147f12012-01-31 14:09:17 +0400525 /*
526 * The last user is gone and thus all sockets have to be destroyed to
527 * the point. Check this.
528 */
529 BUG_ON(!list_empty(&serv->sv_permsocks));
530 BUG_ON(!list_empty(&serv->sv_tempsocks));
NeilBrowncda1fd42007-03-06 01:42:22 -0800531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 cache_clean_deferred(serv);
533
Greg Banks42a7fc42007-03-06 01:42:23 -0800534 if (svc_serv_is_pooled(serv))
535 svc_pool_map_put();
536
Greg Banks3262c812006-10-02 02:17:58 -0700537 kfree(serv->sv_pools);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 kfree(serv);
539}
Trond Myklebust24c37672008-12-23 16:30:12 -0500540EXPORT_SYMBOL_GPL(svc_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542/*
543 * Allocate an RPC server's buffer space.
544 * We allocate pages and place them in rq_argpages.
545 */
546static int
Eric Dumazet11fd1652011-07-28 20:04:09 +0200547svc_init_buffer(struct svc_rqst *rqstp, unsigned int size, int node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548{
Chuck Lever0dc220f2008-04-14 12:27:52 -0400549 unsigned int pages, arghi;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800550
Andy Adamsonba176862010-01-26 21:24:04 -0500551 /* bc_xprt uses fore channel allocated buffers */
552 if (svc_is_backchannel(rqstp))
553 return 1;
554
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700555 pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
556 * We assume one is at most one page
557 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 arghi = 0;
Weston Andros Adamsonb25cd052012-10-23 10:43:41 -0400559 WARN_ON_ONCE(pages > RPCSVC_MAXPAGES);
560 if (pages > RPCSVC_MAXPAGES)
561 pages = RPCSVC_MAXPAGES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 while (pages) {
Eric Dumazet11fd1652011-07-28 20:04:09 +0200563 struct page *p = alloc_pages_node(node, GFP_KERNEL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 if (!p)
565 break;
NeilBrown44524352006-10-04 02:15:46 -0700566 rqstp->rq_pages[arghi++] = p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 pages--;
568 }
Chuck Lever0dc220f2008-04-14 12:27:52 -0400569 return pages == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570}
571
572/*
573 * Release an RPC server buffer
574 */
575static void
576svc_release_buffer(struct svc_rqst *rqstp)
577{
Chuck Lever50c8bb12008-04-14 12:27:45 -0400578 unsigned int i;
579
580 for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
NeilBrown44524352006-10-04 02:15:46 -0700581 if (rqstp->rq_pages[i])
582 put_page(rqstp->rq_pages[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}
584
Jeff Layton0113ab32008-01-29 10:30:54 -0500585struct svc_rqst *
Jeff Layton1b6dc1d2015-06-08 12:11:10 -0700586svc_rqst_alloc(struct svc_serv *serv, struct svc_pool *pool, int node)
Jeff Layton0113ab32008-01-29 10:30:54 -0500587{
588 struct svc_rqst *rqstp;
589
Eric Dumazet11fd1652011-07-28 20:04:09 +0200590 rqstp = kzalloc_node(sizeof(*rqstp), GFP_KERNEL, node);
Jeff Layton0113ab32008-01-29 10:30:54 -0500591 if (!rqstp)
Jeff Layton1b6dc1d2015-06-08 12:11:10 -0700592 return rqstp;
Jeff Layton0113ab32008-01-29 10:30:54 -0500593
Jeff Laytonb1691bc2014-11-21 14:19:30 -0500594 __set_bit(RQ_BUSY, &rqstp->rq_flags);
595 spin_lock_init(&rqstp->rq_lock);
596 rqstp->rq_server = serv;
597 rqstp->rq_pool = pool;
Jeff Layton1b6dc1d2015-06-08 12:11:10 -0700598
599 rqstp->rq_argp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
600 if (!rqstp->rq_argp)
601 goto out_enomem;
602
603 rqstp->rq_resp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
604 if (!rqstp->rq_resp)
605 goto out_enomem;
606
607 if (!svc_init_buffer(rqstp, serv->sv_max_mesg, node))
608 goto out_enomem;
609
610 return rqstp;
611out_enomem:
612 svc_rqst_free(rqstp);
613 return NULL;
614}
615EXPORT_SYMBOL_GPL(svc_rqst_alloc);
616
617struct svc_rqst *
618svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
619{
620 struct svc_rqst *rqstp;
621
622 rqstp = svc_rqst_alloc(serv, pool, node);
623 if (!rqstp)
624 return ERR_PTR(-ENOMEM);
625
626 serv->sv_nrthreads++;
Jeff Layton0113ab32008-01-29 10:30:54 -0500627 spin_lock_bh(&pool->sp_lock);
628 pool->sp_nrthreads++;
Jeff Layton81244382014-11-21 14:19:28 -0500629 list_add_rcu(&rqstp->rq_all, &pool->sp_all_threads);
Jeff Layton0113ab32008-01-29 10:30:54 -0500630 spin_unlock_bh(&pool->sp_lock);
Jeff Layton0113ab32008-01-29 10:30:54 -0500631 return rqstp;
Jeff Layton0113ab32008-01-29 10:30:54 -0500632}
Trond Myklebust24c37672008-12-23 16:30:12 -0500633EXPORT_SYMBOL_GPL(svc_prepare_thread);
Jeff Layton0113ab32008-01-29 10:30:54 -0500634
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635/*
Greg Banksa7455442006-10-02 02:17:59 -0700636 * Choose a pool in which to create a new thread, for svc_set_num_threads
637 */
638static inline struct svc_pool *
639choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
640{
641 if (pool != NULL)
642 return pool;
643
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800644 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700645}
646
647/*
648 * Choose a thread to kill, for svc_set_num_threads
649 */
650static inline struct task_struct *
651choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
652{
653 unsigned int i;
654 struct task_struct *task = NULL;
655
656 if (pool != NULL) {
657 spin_lock_bh(&pool->sp_lock);
658 } else {
659 /* choose a pool in round-robin fashion */
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800660 for (i = 0; i < serv->sv_nrpools; i++) {
661 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700662 spin_lock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800663 if (!list_empty(&pool->sp_all_threads))
664 goto found_pool;
Greg Banksa7455442006-10-02 02:17:59 -0700665 spin_unlock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800666 }
Greg Banksa7455442006-10-02 02:17:59 -0700667 return NULL;
668 }
669
670found_pool:
671 if (!list_empty(&pool->sp_all_threads)) {
672 struct svc_rqst *rqstp;
673
674 /*
675 * Remove from the pool->sp_all_threads list
676 * so we don't try to kill it again.
677 */
678 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
Jeff Layton81244382014-11-21 14:19:28 -0500679 set_bit(RQ_VICTIM, &rqstp->rq_flags);
680 list_del_rcu(&rqstp->rq_all);
Greg Banksa7455442006-10-02 02:17:59 -0700681 task = rqstp->rq_task;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800682 }
Greg Banksa7455442006-10-02 02:17:59 -0700683 spin_unlock_bh(&pool->sp_lock);
684
685 return task;
686}
687
688/*
689 * Create or destroy enough new threads to make the number
690 * of threads the given number. If `pool' is non-NULL, applies
691 * only to threads in that pool, otherwise round-robins between
J. Bruce Fields94cf3172011-12-01 17:51:21 -0500692 * all pools. Caller must ensure that mutual exclusion between this and
693 * server startup or shutdown.
Greg Banksa7455442006-10-02 02:17:59 -0700694 *
695 * Destroying threads relies on the service threads filling in
696 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
697 * has been created using svc_create_pooled().
698 *
699 * Based on code that used to be in nfsd_svc() but tweaked
700 * to be pool-aware.
701 */
702int
703svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
704{
Jeff Layton9867d762008-06-10 08:40:38 -0400705 struct svc_rqst *rqstp;
706 struct task_struct *task;
707 struct svc_pool *chosen_pool;
Greg Banksa7455442006-10-02 02:17:59 -0700708 int error = 0;
709 unsigned int state = serv->sv_nrthreads-1;
Eric Dumazet11fd1652011-07-28 20:04:09 +0200710 int node;
Greg Banksa7455442006-10-02 02:17:59 -0700711
712 if (pool == NULL) {
713 /* The -1 assumes caller has done a svc_get() */
714 nrservs -= (serv->sv_nrthreads-1);
715 } else {
716 spin_lock_bh(&pool->sp_lock);
717 nrservs -= pool->sp_nrthreads;
718 spin_unlock_bh(&pool->sp_lock);
719 }
720
721 /* create new threads */
722 while (nrservs > 0) {
723 nrservs--;
Jeff Layton9867d762008-06-10 08:40:38 -0400724 chosen_pool = choose_pool(serv, pool, &state);
725
Eric Dumazet11fd1652011-07-28 20:04:09 +0200726 node = svc_pool_map_get_node(chosen_pool->sp_id);
727 rqstp = svc_prepare_thread(serv, chosen_pool, node);
Jeff Layton9867d762008-06-10 08:40:38 -0400728 if (IS_ERR(rqstp)) {
729 error = PTR_ERR(rqstp);
Greg Banksa7455442006-10-02 02:17:59 -0700730 break;
731 }
Jeff Layton9867d762008-06-10 08:40:38 -0400732
Jeff Layton758f62f2015-06-08 12:05:56 -0700733 __module_get(serv->sv_ops->svo_module);
Jeff Laytonc3690142015-06-08 12:04:46 -0700734 task = kthread_create_on_node(serv->sv_ops->svo_function, rqstp,
Kees Cookf1701682013-07-03 15:04:58 -0700735 node, "%s", serv->sv_name);
Jeff Layton9867d762008-06-10 08:40:38 -0400736 if (IS_ERR(task)) {
737 error = PTR_ERR(task);
Jeff Layton758f62f2015-06-08 12:05:56 -0700738 module_put(serv->sv_ops->svo_module);
Jeff Layton9867d762008-06-10 08:40:38 -0400739 svc_exit_thread(rqstp);
740 break;
741 }
742
743 rqstp->rq_task = task;
744 if (serv->sv_nrpools > 1)
745 svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
746
747 svc_sock_update_bufs(serv);
748 wake_up_process(task);
Greg Banksa7455442006-10-02 02:17:59 -0700749 }
750 /* destroy old threads */
751 while (nrservs < 0 &&
Jeff Layton9867d762008-06-10 08:40:38 -0400752 (task = choose_victim(serv, pool, &state)) != NULL) {
Jeff Laytona75c5d02008-06-10 08:40:39 -0400753 send_sig(SIGINT, task, 1);
Greg Banksa7455442006-10-02 02:17:59 -0700754 nrservs++;
755 }
756
757 return error;
758}
Trond Myklebust24c37672008-12-23 16:30:12 -0500759EXPORT_SYMBOL_GPL(svc_set_num_threads);
Greg Banksa7455442006-10-02 02:17:59 -0700760
761/*
Jeff Layton3c519912015-01-22 08:19:32 -0500762 * Called from a server thread as it's exiting. Caller must hold the "service
763 * mutex" for the service.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 */
765void
Jeff Layton1b6dc1d2015-06-08 12:11:10 -0700766svc_rqst_free(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 svc_release_buffer(rqstp);
Jesper Juhla51482b2005-11-08 09:41:34 -0800769 kfree(rqstp->rq_resp);
770 kfree(rqstp->rq_argp);
771 kfree(rqstp->rq_auth_data);
Jeff Layton1b6dc1d2015-06-08 12:11:10 -0700772 kfree_rcu(rqstp, rq_rcu_head);
773}
774EXPORT_SYMBOL_GPL(svc_rqst_free);
775
776void
777svc_exit_thread(struct svc_rqst *rqstp)
778{
779 struct svc_serv *serv = rqstp->rq_server;
780 struct svc_pool *pool = rqstp->rq_pool;
Greg Banks3262c812006-10-02 02:17:58 -0700781
782 spin_lock_bh(&pool->sp_lock);
783 pool->sp_nrthreads--;
Jeff Layton81244382014-11-21 14:19:28 -0500784 if (!test_and_set_bit(RQ_VICTIM, &rqstp->rq_flags))
785 list_del_rcu(&rqstp->rq_all);
Greg Banks3262c812006-10-02 02:17:58 -0700786 spin_unlock_bh(&pool->sp_lock);
787
Jeff Layton1b6dc1d2015-06-08 12:11:10 -0700788 svc_rqst_free(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
790 /* Release the server */
791 if (serv)
792 svc_destroy(serv);
793}
Trond Myklebust24c37672008-12-23 16:30:12 -0500794EXPORT_SYMBOL_GPL(svc_exit_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796/*
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500797 * Register an "inet" protocol family netid with the local
798 * rpcbind daemon via an rpcbind v4 SET request.
Chuck Levera26cfad2008-08-18 19:34:16 -0400799 *
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500800 * No netconfig infrastructure is available in the kernel, so
801 * we map IP_ protocol numbers to netids by hand.
Chuck Levera26cfad2008-08-18 19:34:16 -0400802 *
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500803 * Returns zero on success; a negative errno value is returned
804 * if any error occurs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400806static int __svc_rpcb_register4(struct net *net, const u32 program,
807 const u32 version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500808 const unsigned short protocol,
809 const unsigned short port)
Chuck Levera26cfad2008-08-18 19:34:16 -0400810{
Chuck Levercadc0fa2009-03-18 20:47:36 -0400811 const struct sockaddr_in sin = {
Chuck Levera26cfad2008-08-18 19:34:16 -0400812 .sin_family = AF_INET,
813 .sin_addr.s_addr = htonl(INADDR_ANY),
814 .sin_port = htons(port),
815 };
Chuck Levercadc0fa2009-03-18 20:47:36 -0400816 const char *netid;
817 int error;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500818
819 switch (protocol) {
820 case IPPROTO_UDP:
821 netid = RPCBIND_NETID_UDP;
822 break;
823 case IPPROTO_TCP:
824 netid = RPCBIND_NETID_TCP;
825 break;
826 default:
Chuck Leverba5c35e2009-03-18 20:46:59 -0400827 return -ENOPROTOOPT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500828 }
829
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400830 error = rpcb_v4_register(net, program, version,
Chuck Levercadc0fa2009-03-18 20:47:36 -0400831 (const struct sockaddr *)&sin, netid);
832
833 /*
834 * User space didn't support rpcbind v4, so retry this
835 * registration request with the legacy rpcbind v2 protocol.
836 */
837 if (error == -EPROTONOSUPPORT)
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400838 error = rpcb_register(net, program, version, protocol, port);
Chuck Levercadc0fa2009-03-18 20:47:36 -0400839
840 return error;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500841}
842
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000843#if IS_ENABLED(CONFIG_IPV6)
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500844/*
845 * Register an "inet6" protocol family netid with the local
846 * rpcbind daemon via an rpcbind v4 SET request.
847 *
848 * No netconfig infrastructure is available in the kernel, so
849 * we map IP_ protocol numbers to netids by hand.
850 *
851 * Returns zero on success; a negative errno value is returned
852 * if any error occurs.
853 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400854static int __svc_rpcb_register6(struct net *net, const u32 program,
855 const u32 version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500856 const unsigned short protocol,
857 const unsigned short port)
858{
Chuck Levercadc0fa2009-03-18 20:47:36 -0400859 const struct sockaddr_in6 sin6 = {
Chuck Levera26cfad2008-08-18 19:34:16 -0400860 .sin6_family = AF_INET6,
861 .sin6_addr = IN6ADDR_ANY_INIT,
862 .sin6_port = htons(port),
863 };
Chuck Levercadc0fa2009-03-18 20:47:36 -0400864 const char *netid;
865 int error;
Chuck Levera26cfad2008-08-18 19:34:16 -0400866
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500867 switch (protocol) {
868 case IPPROTO_UDP:
869 netid = RPCBIND_NETID_UDP6;
870 break;
871 case IPPROTO_TCP:
872 netid = RPCBIND_NETID_TCP6;
873 break;
874 default:
Chuck Leverba5c35e2009-03-18 20:46:59 -0400875 return -ENOPROTOOPT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500876 }
877
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400878 error = rpcb_v4_register(net, program, version,
Chuck Levercadc0fa2009-03-18 20:47:36 -0400879 (const struct sockaddr *)&sin6, netid);
880
881 /*
882 * User space didn't support rpcbind version 4, so we won't
883 * use a PF_INET6 listener.
884 */
885 if (error == -EPROTONOSUPPORT)
886 error = -EAFNOSUPPORT;
887
888 return error;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500889}
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000890#endif /* IS_ENABLED(CONFIG_IPV6) */
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500891
892/*
893 * Register a kernel RPC service via rpcbind version 4.
894 *
895 * Returns zero on success; a negative errno value is returned
896 * if any error occurs.
897 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400898static int __svc_register(struct net *net, const char *progname,
Chuck Lever363f7242009-03-18 20:47:44 -0400899 const u32 program, const u32 version,
Chuck Lever4b62e582009-03-18 20:46:06 -0400900 const int family,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500901 const unsigned short protocol,
902 const unsigned short port)
903{
Chuck Lever363f7242009-03-18 20:47:44 -0400904 int error = -EAFNOSUPPORT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500905
Chuck Levera26cfad2008-08-18 19:34:16 -0400906 switch (family) {
Chuck Lever4b62e582009-03-18 20:46:06 -0400907 case PF_INET:
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400908 error = __svc_rpcb_register4(net, program, version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500909 protocol, port);
Chuck Levercadc0fa2009-03-18 20:47:36 -0400910 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000911#if IS_ENABLED(CONFIG_IPV6)
Chuck Lever4b62e582009-03-18 20:46:06 -0400912 case PF_INET6:
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400913 error = __svc_rpcb_register6(net, program, version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500914 protocol, port);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000915#endif
Chuck Levera26cfad2008-08-18 19:34:16 -0400916 }
917
Chuck Lever363f7242009-03-18 20:47:44 -0400918 return error;
Chuck Levera26cfad2008-08-18 19:34:16 -0400919}
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500920
Chuck Levera26cfad2008-08-18 19:34:16 -0400921/**
922 * svc_register - register an RPC service with the local portmapper
923 * @serv: svc_serv struct for the service to register
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400924 * @net: net namespace for the service to register
Chuck Lever4b62e582009-03-18 20:46:06 -0400925 * @family: protocol family of service's listener socket
Chuck Levera26cfad2008-08-18 19:34:16 -0400926 * @proto: transport protocol number to advertise
927 * @port: port to advertise
928 *
Chuck Lever4b62e582009-03-18 20:46:06 -0400929 * Service is registered for any address in the passed-in protocol family
Chuck Levera26cfad2008-08-18 19:34:16 -0400930 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400931int svc_register(const struct svc_serv *serv, struct net *net,
932 const int family, const unsigned short proto,
933 const unsigned short port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934{
935 struct svc_program *progp;
Kinglong Mee7e55b592013-12-31 13:17:20 +0800936 struct svc_version *vers;
Chuck Leverea339d42007-10-26 13:32:56 -0400937 unsigned int i;
Chuck Lever14aeb212008-08-18 19:34:00 -0400938 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
Weston Andros Adamson0af39502012-10-23 10:43:45 -0400940 WARN_ON_ONCE(proto == 0 && port == 0);
941 if (proto == 0 && port == 0)
942 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700944 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
945 for (i = 0; i < progp->pg_nvers; i++) {
Kinglong Mee7e55b592013-12-31 13:17:20 +0800946 vers = progp->pg_vers[i];
947 if (vers == NULL)
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700948 continue;
949
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500950 dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700951 progp->pg_name,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500952 i,
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700953 proto == IPPROTO_UDP? "udp" : "tcp",
954 port,
Chuck Lever4b62e582009-03-18 20:46:06 -0400955 family,
Kinglong Mee7e55b592013-12-31 13:17:20 +0800956 vers->vs_hidden ?
957 " (but not telling portmap)" : "");
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700958
Kinglong Mee7e55b592013-12-31 13:17:20 +0800959 if (vers->vs_hidden)
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700960 continue;
961
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400962 error = __svc_register(net, progp->pg_name, progp->pg_prog,
Chuck Lever363f7242009-03-18 20:47:44 -0400963 i, family, proto, port);
Kinglong Mee7e55b592013-12-31 13:17:20 +0800964
965 if (vers->vs_rpcb_optnl) {
966 error = 0;
967 continue;
968 }
969
970 if (error < 0) {
971 printk(KERN_WARNING "svc: failed to register "
972 "%sv%u RPC service (errno %d).\n",
973 progp->pg_name, i, -error);
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700974 break;
Kinglong Mee7e55b592013-12-31 13:17:20 +0800975 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 }
977 }
978
Chuck Lever7252d572008-08-18 19:34:08 -0400979 return error;
980}
981
Chuck Leverd5a86202009-03-18 20:47:29 -0400982/*
983 * If user space is running rpcbind, it should take the v4 UNSET
984 * and clear everything for this [program, version]. If user space
985 * is running portmap, it will reject the v4 UNSET, but won't have
986 * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient
987 * in this case to clear all existing entries for [program, version].
988 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400989static void __svc_unregister(struct net *net, const u32 program, const u32 version,
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400990 const char *progname)
991{
992 int error;
993
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400994 error = rpcb_v4_register(net, program, version, NULL, "");
Chuck Leverd5a86202009-03-18 20:47:29 -0400995
996 /*
997 * User space didn't support rpcbind v4, so retry this
998 * request with the legacy rpcbind v2 protocol.
999 */
1000 if (error == -EPROTONOSUPPORT)
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +04001001 error = rpcb_register(net, program, version, 0, 0);
Chuck Leverd5a86202009-03-18 20:47:29 -04001002
Chuck Leverf6fb3f62008-09-25 11:56:57 -04001003 dprintk("svc: %s(%sv%u), error %d\n",
1004 __func__, progname, version, error);
1005}
1006
Chuck Lever7252d572008-08-18 19:34:08 -04001007/*
Chuck Leverf6fb3f62008-09-25 11:56:57 -04001008 * All netids, bind addresses and ports registered for [program, version]
1009 * are removed from the local rpcbind database (if the service is not
1010 * hidden) to make way for a new instance of the service.
Chuck Lever7252d572008-08-18 19:34:08 -04001011 *
Chuck Leverf6fb3f62008-09-25 11:56:57 -04001012 * The result of unregistration is reported via dprintk for those who want
1013 * verification of the result, but is otherwise not important.
Chuck Lever7252d572008-08-18 19:34:08 -04001014 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +04001015static void svc_unregister(const struct svc_serv *serv, struct net *net)
Chuck Lever7252d572008-08-18 19:34:08 -04001016{
1017 struct svc_program *progp;
1018 unsigned long flags;
1019 unsigned int i;
Chuck Lever7252d572008-08-18 19:34:08 -04001020
1021 clear_thread_flag(TIF_SIGPENDING);
1022
1023 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
1024 for (i = 0; i < progp->pg_nvers; i++) {
1025 if (progp->pg_vers[i] == NULL)
1026 continue;
1027 if (progp->pg_vers[i]->vs_hidden)
1028 continue;
1029
Chuck Lever7402ab192011-05-09 15:22:55 -04001030 dprintk("svc: attempting to unregister %sv%u\n",
1031 progp->pg_name, i);
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +04001032 __svc_unregister(net, progp->pg_prog, i, progp->pg_name);
Chuck Lever7252d572008-08-18 19:34:08 -04001033 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 }
1035
Chuck Lever7252d572008-08-18 19:34:08 -04001036 spin_lock_irqsave(&current->sighand->siglock, flags);
1037 recalc_sigpending();
1038 spin_unlock_irqrestore(&current->sighand->siglock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039}
1040
1041/*
J. Bruce Fields7032a3d2012-10-09 18:33:38 -04001042 * dprintk the given error with the address of the client that caused it.
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001043 */
Jeff Laytonf895b252014-11-17 16:58:04 -05001044#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
Joe Perchesb9075fa2011-10-31 17:11:33 -07001045static __printf(2, 3)
Joe Perchese87cc472012-05-13 21:56:26 +00001046void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001047{
Joe Perchese87cc472012-05-13 21:56:26 +00001048 struct va_format vaf;
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001049 va_list args;
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001050 char buf[RPC_MAX_ADDRBUFLEN];
1051
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001052 va_start(args, fmt);
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001053
Joe Perchese87cc472012-05-13 21:56:26 +00001054 vaf.fmt = fmt;
1055 vaf.va = &args;
1056
J. Bruce Fields7032a3d2012-10-09 18:33:38 -04001057 dprintk("svc: %s: %pV", svc_print_addr(rqstp, buf, sizeof(buf)), &vaf);
Joe Perchese87cc472012-05-13 21:56:26 +00001058
1059 va_end(args);
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001060}
J. Bruce Fields624ab462013-01-08 16:22:15 -05001061#else
1062static __printf(2,3) void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) {}
1063#endif
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001064
1065/*
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001066 * Common routine for processing the RPC request.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 */
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001068static int
1069svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070{
1071 struct svc_program *progp;
1072 struct svc_version *versp = NULL; /* compiler food */
1073 struct svc_procedure *procp = NULL;
NeilBrown6fb2b472006-10-02 02:17:50 -07001074 struct svc_serv *serv = rqstp->rq_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 kxdrproc_t xdr;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001076 __be32 *statp;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001077 u32 prog, vers, proc;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001078 __be32 auth_stat, rpc_stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 int auth_res;
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001080 __be32 *reply_statp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
1082 rpc_stat = rpc_success;
1083
1084 if (argv->iov_len < 6*4)
1085 goto err_short_len;
1086
J. Bruce Fields5c04c462006-06-30 01:56:19 -07001087 /* Will be turned off only in gss privacy case: */
Jeff Layton779fb0f2014-11-19 07:51:18 -05001088 set_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
Andy Adamson2f425872009-04-03 08:27:32 +03001089 /* Will be turned off only when NFSv4 Sessions are used */
Jeff Layton30660e04b2014-11-19 07:51:16 -05001090 set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
Jeff Layton78b65eb2014-11-19 07:51:17 -05001091 clear_bit(RQ_DROPME, &rqstp->rq_flags);
Tom Tuckere831fe62007-12-30 21:07:29 -06001092
1093 /* Setup reply header */
1094 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 svc_putu32(resv, rqstp->rq_xid);
1097
Alexey Dobriyan76994312006-09-26 22:28:46 -07001098 vers = svc_getnl(argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099
1100 /* First words of reply: */
Alexey Dobriyan76994312006-09-26 22:28:46 -07001101 svc_putnl(resv, 1); /* REPLY */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 if (vers != 2) /* RPC version number */
1104 goto err_bad_rpc;
1105
1106 /* Save position in case we later decide to reject: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001107 reply_statp = resv->iov_base + resv->iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108
Alexey Dobriyan76994312006-09-26 22:28:46 -07001109 svc_putnl(resv, 0); /* ACCEPT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
Alexey Dobriyan76994312006-09-26 22:28:46 -07001111 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
1112 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
1113 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
NeilBrown80d188a2005-11-07 01:00:27 -08001115 for (progp = serv->sv_program; progp; progp = progp->pg_next)
1116 if (prog == progp->pg_prog)
1117 break;
1118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 /*
1120 * Decode auth data, and add verifier to reply buffer.
1121 * We do this before anything else in order to get a decent
1122 * auth verifier.
1123 */
1124 auth_res = svc_authenticate(rqstp, &auth_stat);
1125 /* Also give the program a chance to reject this call: */
NeilBrown80d188a2005-11-07 01:00:27 -08001126 if (auth_res == SVC_OK && progp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 auth_stat = rpc_autherr_badcred;
1128 auth_res = progp->pg_authenticate(rqstp);
1129 }
1130 switch (auth_res) {
1131 case SVC_OK:
1132 break;
1133 case SVC_GARBAGE:
Harshula Jayasuriyadd352102008-02-20 10:56:56 +11001134 goto err_garbage;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 case SVC_SYSERR:
1136 rpc_stat = rpc_system_err;
1137 goto err_bad;
1138 case SVC_DENIED:
1139 goto err_bad_auth;
NeilBrown1ebede82010-08-12 17:04:07 +10001140 case SVC_CLOSE:
1141 if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags))
1142 svc_close_xprt(rqstp->rq_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 case SVC_DROP:
1144 goto dropit;
1145 case SVC_COMPLETE:
1146 goto sendit;
1147 }
NeilBrown80d188a2005-11-07 01:00:27 -08001148
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +00001149 if (progp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 goto err_bad_prog;
1151
1152 if (vers >= progp->pg_nvers ||
1153 !(versp = progp->pg_vers[vers]))
1154 goto err_bad_vers;
1155
1156 procp = versp->vs_proc + proc;
1157 if (proc >= versp->vs_nproc || !procp->pc_func)
1158 goto err_bad_proc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 rqstp->rq_procinfo = procp;
1160
1161 /* Syntactic check complete */
1162 serv->sv_stats->rpccnt++;
1163
1164 /* Build the reply header. */
1165 statp = resv->iov_base +resv->iov_len;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001166 svc_putnl(resv, RPC_SUCCESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
1168 /* Bump per-procedure stats counter */
1169 procp->pc_count++;
1170
1171 /* Initialize storage for argp and resp */
1172 memset(rqstp->rq_argp, 0, procp->pc_argsize);
1173 memset(rqstp->rq_resp, 0, procp->pc_ressize);
1174
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001175 /* un-reserve some of the out-queue now that we have a
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 * better idea of reply size
1177 */
1178 if (procp->pc_xdrressize)
Jeff Laytoncd123012007-05-09 02:34:50 -07001179 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
1181 /* Call the function that processes the request. */
1182 if (!versp->vs_dispatch) {
1183 /* Decode arguments */
1184 xdr = procp->pc_decode;
1185 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
1186 goto err_garbage;
1187
1188 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
1189
1190 /* Encode reply */
Chuck Lever0533b132016-06-29 13:55:14 -04001191 if (*statp == rpc_drop_reply ||
1192 test_bit(RQ_DROPME, &rqstp->rq_flags)) {
NeilBrownd343fce2006-10-17 00:10:18 -07001193 if (procp->pc_release)
1194 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1195 goto dropit;
1196 }
Chuck Levera4e187d2016-06-29 13:55:22 -04001197 if (*statp == rpc_autherr_badcred) {
1198 if (procp->pc_release)
1199 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1200 goto err_bad_auth;
1201 }
Joe Perchesf64f9e72009-11-29 16:55:45 -08001202 if (*statp == rpc_success &&
1203 (xdr = procp->pc_encode) &&
1204 !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 dprintk("svc: failed to encode reply\n");
1206 /* serv->sv_stats->rpcsystemerr++; */
1207 *statp = rpc_system_err;
1208 }
1209 } else {
1210 dprintk("svc: calling dispatcher\n");
1211 if (!versp->vs_dispatch(rqstp, statp)) {
1212 /* Release reply info */
1213 if (procp->pc_release)
1214 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1215 goto dropit;
1216 }
1217 }
1218
1219 /* Check RPC status result */
1220 if (*statp != rpc_success)
1221 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
1222
1223 /* Release reply info */
1224 if (procp->pc_release)
1225 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1226
1227 if (procp->pc_encode == NULL)
1228 goto dropit;
1229
1230 sendit:
1231 if (svc_authorise(rqstp))
1232 goto dropit;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001233 return 1; /* Caller can now send it */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
1235 dropit:
1236 svc_authorise(rqstp); /* doesn't hurt to call this twice */
1237 dprintk("svc: svc_process dropit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 return 0;
1239
1240err_short_len:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001241 svc_printk(rqstp, "short len %Zd, dropping request\n",
1242 argv->iov_len);
NeilBrown34e9a632007-01-29 13:19:52 -08001243
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 goto dropit; /* drop request */
1245
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246err_bad_rpc:
1247 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001248 svc_putnl(resv, 1); /* REJECT */
1249 svc_putnl(resv, 0); /* RPC_MISMATCH */
1250 svc_putnl(resv, 2); /* Only RPCv2 supported */
1251 svc_putnl(resv, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 goto sendit;
1253
1254err_bad_auth:
1255 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1256 serv->sv_stats->rpcbadauth++;
1257 /* Restore write pointer to location of accept status: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001258 xdr_ressize_check(rqstp, reply_statp);
Alexey Dobriyan76994312006-09-26 22:28:46 -07001259 svc_putnl(resv, 1); /* REJECT */
1260 svc_putnl(resv, 1); /* AUTH_ERROR */
1261 svc_putnl(resv, ntohl(auth_stat)); /* status */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 goto sendit;
1263
1264err_bad_prog:
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +00001265 dprintk("svc: unknown program %d\n", prog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001267 svc_putnl(resv, RPC_PROG_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 goto sendit;
1269
1270err_bad_vers:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001271 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
NeilBrown34e9a632007-01-29 13:19:52 -08001272 vers, prog, progp->pg_name);
1273
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001275 svc_putnl(resv, RPC_PROG_MISMATCH);
1276 svc_putnl(resv, progp->pg_lovers);
1277 svc_putnl(resv, progp->pg_hivers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 goto sendit;
1279
1280err_bad_proc:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001281 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
NeilBrown34e9a632007-01-29 13:19:52 -08001282
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001284 svc_putnl(resv, RPC_PROC_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 goto sendit;
1286
1287err_garbage:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001288 svc_printk(rqstp, "failed to decode args\n");
NeilBrown34e9a632007-01-29 13:19:52 -08001289
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 rpc_stat = rpc_garbage_args;
1291err_bad:
1292 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001293 svc_putnl(resv, ntohl(rpc_stat));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 goto sendit;
1295}
Greg Banks7adae482006-10-04 02:15:47 -07001296
1297/*
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001298 * Process the RPC request.
1299 */
1300int
1301svc_process(struct svc_rqst *rqstp)
1302{
1303 struct kvec *argv = &rqstp->rq_arg.head[0];
1304 struct kvec *resv = &rqstp->rq_res.head[0];
1305 struct svc_serv *serv = rqstp->rq_server;
1306 u32 dir;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001307
1308 /*
1309 * Setup response xdr_buf.
1310 * Initially it has just one page
1311 */
J. Bruce Fieldsafc59402012-12-10 18:01:37 -05001312 rqstp->rq_next_page = &rqstp->rq_respages[1];
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001313 resv->iov_base = page_address(rqstp->rq_respages[0]);
1314 resv->iov_len = 0;
1315 rqstp->rq_res.pages = rqstp->rq_respages + 1;
1316 rqstp->rq_res.len = 0;
1317 rqstp->rq_res.page_base = 0;
1318 rqstp->rq_res.page_len = 0;
1319 rqstp->rq_res.buflen = PAGE_SIZE;
1320 rqstp->rq_res.tail[0].iov_base = NULL;
1321 rqstp->rq_res.tail[0].iov_len = 0;
1322
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001323 dir = svc_getnl(argv);
1324 if (dir != 0) {
1325 /* direction != CALL */
1326 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1327 serv->sv_stats->rpcbadfmt++;
Jeff Layton860a0d92014-10-28 14:24:12 -04001328 goto out_drop;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001329 }
1330
Andy Adamson4b5b3ba2011-01-06 02:04:24 +00001331 /* Returns 1 for send, 0 for drop */
Jeff Layton860a0d92014-10-28 14:24:12 -04001332 if (likely(svc_process_common(rqstp, argv, resv))) {
1333 int ret = svc_send(rqstp);
1334
1335 trace_svc_process(rqstp, ret);
1336 return ret;
Andy Adamson4b5b3ba2011-01-06 02:04:24 +00001337 }
Jeff Layton860a0d92014-10-28 14:24:12 -04001338out_drop:
1339 trace_svc_process(rqstp, 0);
1340 svc_drop(rqstp);
1341 return 0;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001342}
Chuck Lever3f87d5d2015-05-26 13:48:57 -04001343EXPORT_SYMBOL_GPL(svc_process);
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001344
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001345#if defined(CONFIG_SUNRPC_BACKCHANNEL)
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001346/*
1347 * Process a backchannel RPC request that arrived over an existing
1348 * outbound connection
1349 */
1350int
1351bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
1352 struct svc_rqst *rqstp)
1353{
1354 struct kvec *argv = &rqstp->rq_arg.head[0];
1355 struct kvec *resv = &rqstp->rq_res.head[0];
Chuck Lever632dda82015-05-11 14:04:50 -04001356 struct rpc_task *task;
Trond Myklebust0d2a9702015-06-04 15:37:10 -04001357 int proc_error;
Chuck Lever632dda82015-05-11 14:04:50 -04001358 int error;
1359
1360 dprintk("svc: %s(%p)\n", __func__, req);
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001361
1362 /* Build the svc_rqst used by the common processing routine */
Andy Adamson4a19de02011-01-06 02:04:35 +00001363 rqstp->rq_xprt = serv->sv_bc_xprt;
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001364 rqstp->rq_xid = req->rq_xid;
1365 rqstp->rq_prot = req->rq_xprt->prot;
1366 rqstp->rq_server = serv;
1367
1368 rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
1369 memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
1370 memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
1371 memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
Trond Myklebust756b9b32015-12-07 12:52:23 -08001372
1373 /* Adjust the argument buffer length */
Benjamin Coddington38b76312015-11-20 09:55:30 -05001374 rqstp->rq_arg.len = req->rq_private_buf.len;
Trond Myklebust756b9b32015-12-07 12:52:23 -08001375 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1376 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1377 rqstp->rq_arg.page_len = 0;
1378 } else if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len +
1379 rqstp->rq_arg.page_len)
1380 rqstp->rq_arg.page_len = rqstp->rq_arg.len -
1381 rqstp->rq_arg.head[0].iov_len;
1382 else
1383 rqstp->rq_arg.len = rqstp->rq_arg.head[0].iov_len +
1384 rqstp->rq_arg.page_len;
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001385
1386 /* reset result send buffer "put" position */
1387 resv->iov_len = 0;
1388
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001389 /*
1390 * Skip the next two words because they've already been
Chuck Lever632dda82015-05-11 14:04:50 -04001391 * processed in the transport
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001392 */
1393 svc_getu32(argv); /* XID */
1394 svc_getnl(argv); /* CALLDIR */
1395
Chuck Lever632dda82015-05-11 14:04:50 -04001396 /* Parse and execute the bc call */
Trond Myklebust0d2a9702015-06-04 15:37:10 -04001397 proc_error = svc_process_common(rqstp, argv, resv);
1398
1399 atomic_inc(&req->rq_xprt->bc_free_slots);
1400 if (!proc_error) {
Chuck Lever632dda82015-05-11 14:04:50 -04001401 /* Processing error: drop the request */
Trond Myklebustb3b02ae2012-05-31 15:26:38 -04001402 xprt_free_bc_request(req);
Andy Adamson4b5b3ba2011-01-06 02:04:24 +00001403 return 0;
1404 }
Chuck Lever632dda82015-05-11 14:04:50 -04001405
1406 /* Finally, send the reply synchronously */
1407 memcpy(&req->rq_snd_buf, &rqstp->rq_res, sizeof(req->rq_snd_buf));
Trond Myklebust0f419792015-06-01 22:59:08 -04001408 task = rpc_run_bc_task(req);
Chuck Lever632dda82015-05-11 14:04:50 -04001409 if (IS_ERR(task)) {
1410 error = PTR_ERR(task);
1411 goto out;
1412 }
1413
1414 WARN_ON_ONCE(atomic_read(&task->tk_count) != 1);
1415 error = task->tk_status;
1416 rpc_put_task(task);
1417
1418out:
1419 dprintk("svc: %s(), error=%d\n", __func__, error);
1420 return error;
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001421}
Trond Myklebust0d961aa2011-07-13 19:24:15 -04001422EXPORT_SYMBOL_GPL(bc_svc_process);
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001423#endif /* CONFIG_SUNRPC_BACKCHANNEL */
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001424
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001425/*
Greg Banks7adae482006-10-04 02:15:47 -07001426 * Return (transport-specific) limit on the rpc payload.
1427 */
1428u32 svc_max_payload(const struct svc_rqst *rqstp)
1429{
Tom Tucker49023152007-12-30 21:07:21 -06001430 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
Greg Banks7adae482006-10-04 02:15:47 -07001431
NeilBrownc6b0a9f2006-10-06 00:44:05 -07001432 if (rqstp->rq_server->sv_max_payload < max)
1433 max = rqstp->rq_server->sv_max_payload;
Greg Banks7adae482006-10-04 02:15:47 -07001434 return max;
1435}
1436EXPORT_SYMBOL_GPL(svc_max_payload);