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1 : : /* SPDX-License-Identifier: GPL-2.0 */
2 : : /*
3 : : * linux/include/linux/sunrpc/svc.h
4 : : *
5 : : * RPC server declarations.
6 : : *
7 : : * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
8 : : */
9 : :
10 : :
11 : : #ifndef SUNRPC_SVC_H
12 : : #define SUNRPC_SVC_H
13 : :
14 : : #include <linux/in.h>
15 : : #include <linux/in6.h>
16 : : #include <linux/sunrpc/types.h>
17 : : #include <linux/sunrpc/xdr.h>
18 : : #include <linux/sunrpc/auth.h>
19 : : #include <linux/sunrpc/svcauth.h>
20 : : #include <linux/wait.h>
21 : : #include <linux/mm.h>
22 : :
23 : : /* statistics for svc_pool structures */
24 : : struct svc_pool_stats {
25 : : atomic_long_t packets;
26 : : unsigned long sockets_queued;
27 : : atomic_long_t threads_woken;
28 : : atomic_long_t threads_timedout;
29 : : };
30 : :
31 : : /*
32 : : *
33 : : * RPC service thread pool.
34 : : *
35 : : * Pool of threads and temporary sockets. Generally there is only
36 : : * a single one of these per RPC service, but on NUMA machines those
37 : : * services that can benefit from it (i.e. nfs but not lockd) will
38 : : * have one pool per NUMA node. This optimisation reduces cross-
39 : : * node traffic on multi-node NUMA NFS servers.
40 : : */
41 : : struct svc_pool {
42 : : unsigned int sp_id; /* pool id; also node id on NUMA */
43 : : spinlock_t sp_lock; /* protects all fields */
44 : : struct list_head sp_sockets; /* pending sockets */
45 : : unsigned int sp_nrthreads; /* # of threads in pool */
46 : : struct list_head sp_all_threads; /* all server threads */
47 : : struct svc_pool_stats sp_stats; /* statistics on pool operation */
48 : : #define SP_TASK_PENDING (0) /* still work to do even if no
49 : : * xprt is queued. */
50 : : #define SP_CONGESTED (1)
51 : : unsigned long sp_flags;
52 : : } ____cacheline_aligned_in_smp;
53 : :
54 : : struct svc_serv;
55 : :
56 : : struct svc_serv_ops {
57 : : /* Callback to use when last thread exits. */
58 : : void (*svo_shutdown)(struct svc_serv *, struct net *);
59 : :
60 : : /* function for service threads to run */
61 : : int (*svo_function)(void *);
62 : :
63 : : /* queue up a transport for servicing */
64 : : void (*svo_enqueue_xprt)(struct svc_xprt *);
65 : :
66 : : /* set up thread (or whatever) execution context */
67 : : int (*svo_setup)(struct svc_serv *, struct svc_pool *, int);
68 : :
69 : : /* optional module to count when adding threads (pooled svcs only) */
70 : : struct module *svo_module;
71 : : };
72 : :
73 : : /*
74 : : * RPC service.
75 : : *
76 : : * An RPC service is a ``daemon,'' possibly multithreaded, which
77 : : * receives and processes incoming RPC messages.
78 : : * It has one or more transport sockets associated with it, and maintains
79 : : * a list of idle threads waiting for input.
80 : : *
81 : : * We currently do not support more than one RPC program per daemon.
82 : : */
83 : : struct svc_serv {
84 : : struct svc_program * sv_program; /* RPC program */
85 : : struct svc_stat * sv_stats; /* RPC statistics */
86 : : spinlock_t sv_lock;
87 : : unsigned int sv_nrthreads; /* # of server threads */
88 : : unsigned int sv_maxconn; /* max connections allowed or
89 : : * '0' causing max to be based
90 : : * on number of threads. */
91 : :
92 : : unsigned int sv_max_payload; /* datagram payload size */
93 : : unsigned int sv_max_mesg; /* max_payload + 1 page for overheads */
94 : : unsigned int sv_xdrsize; /* XDR buffer size */
95 : : struct list_head sv_permsocks; /* all permanent sockets */
96 : : struct list_head sv_tempsocks; /* all temporary sockets */
97 : : int sv_tmpcnt; /* count of temporary sockets */
98 : : struct timer_list sv_temptimer; /* timer for aging temporary sockets */
99 : :
100 : : char * sv_name; /* service name */
101 : :
102 : : unsigned int sv_nrpools; /* number of thread pools */
103 : : struct svc_pool * sv_pools; /* array of thread pools */
104 : : const struct svc_serv_ops *sv_ops; /* server operations */
105 : : #if defined(CONFIG_SUNRPC_BACKCHANNEL)
106 : : struct list_head sv_cb_list; /* queue for callback requests
107 : : * that arrive over the same
108 : : * connection */
109 : : spinlock_t sv_cb_lock; /* protects the svc_cb_list */
110 : : wait_queue_head_t sv_cb_waitq; /* sleep here if there are no
111 : : * entries in the svc_cb_list */
112 : : bool sv_bc_enabled; /* service uses backchannel */
113 : : #endif /* CONFIG_SUNRPC_BACKCHANNEL */
114 : : };
115 : :
116 : : /*
117 : : * We use sv_nrthreads as a reference count. svc_destroy() drops
118 : : * this refcount, so we need to bump it up around operations that
119 : : * change the number of threads. Horrible, but there it is.
120 : : * Should be called with the "service mutex" held.
121 : : */
122 : 0 : static inline void svc_get(struct svc_serv *serv)
123 : : {
124 : 0 : serv->sv_nrthreads++;
125 : : }
126 : :
127 : : /*
128 : : * Maximum payload size supported by a kernel RPC server.
129 : : * This is use to determine the max number of pages nfsd is
130 : : * willing to return in a single READ operation.
131 : : *
132 : : * These happen to all be powers of 2, which is not strictly
133 : : * necessary but helps enforce the real limitation, which is
134 : : * that they should be multiples of PAGE_SIZE.
135 : : *
136 : : * For UDP transports, a block plus NFS,RPC, and UDP headers
137 : : * has to fit into the IP datagram limit of 64K. The largest
138 : : * feasible number for all known page sizes is probably 48K,
139 : : * but we choose 32K here. This is the same as the historical
140 : : * Linux limit; someone who cares more about NFS/UDP performance
141 : : * can test a larger number.
142 : : *
143 : : * For TCP transports we have more freedom. A size of 1MB is
144 : : * chosen to match the client limit. Other OSes are known to
145 : : * have larger limits, but those numbers are probably beyond
146 : : * the point of diminishing returns.
147 : : */
148 : : #define RPCSVC_MAXPAYLOAD (1*1024*1024u)
149 : : #define RPCSVC_MAXPAYLOAD_TCP RPCSVC_MAXPAYLOAD
150 : : #define RPCSVC_MAXPAYLOAD_UDP (32*1024u)
151 : :
152 : : extern u32 svc_max_payload(const struct svc_rqst *rqstp);
153 : :
154 : : /*
155 : : * RPC Requsts and replies are stored in one or more pages.
156 : : * We maintain an array of pages for each server thread.
157 : : * Requests are copied into these pages as they arrive. Remaining
158 : : * pages are available to write the reply into.
159 : : *
160 : : * Pages are sent using ->sendpage so each server thread needs to
161 : : * allocate more to replace those used in sending. To help keep track
162 : : * of these pages we have a receive list where all pages initialy live,
163 : : * and a send list where pages are moved to when there are to be part
164 : : * of a reply.
165 : : *
166 : : * We use xdr_buf for holding responses as it fits well with NFS
167 : : * read responses (that have a header, and some data pages, and possibly
168 : : * a tail) and means we can share some client side routines.
169 : : *
170 : : * The xdr_buf.head kvec always points to the first page in the rq_*pages
171 : : * list. The xdr_buf.pages pointer points to the second page on that
172 : : * list. xdr_buf.tail points to the end of the first page.
173 : : * This assumes that the non-page part of an rpc reply will fit
174 : : * in a page - NFSd ensures this. lockd also has no trouble.
175 : : *
176 : : * Each request/reply pair can have at most one "payload", plus two pages,
177 : : * one for the request, and one for the reply.
178 : : * We using ->sendfile to return read data, we might need one extra page
179 : : * if the request is not page-aligned. So add another '1'.
180 : : */
181 : : #define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \
182 : : + 2 + 1)
183 : :
184 : 0 : static inline u32 svc_getnl(struct kvec *iov)
185 : : {
186 : 0 : __be32 val, *vp;
187 : 0 : vp = iov->iov_base;
188 : 0 : val = *vp++;
189 : 0 : iov->iov_base = (void*)vp;
190 : 0 : iov->iov_len -= sizeof(__be32);
191 [ # # # # : 0 : return ntohl(val);
# # # # #
# # # # #
# # # # #
# # # ]
192 : : }
193 : :
194 : 0 : static inline void svc_putnl(struct kvec *iov, u32 val)
195 : : {
196 : 0 : __be32 *vp = iov->iov_base + iov->iov_len;
197 : 0 : *vp = htonl(val);
198 [ # # # # : 0 : iov->iov_len += sizeof(__be32);
# # ]
199 : 0 : }
200 : :
201 : 0 : static inline __be32 svc_getu32(struct kvec *iov)
202 : : {
203 : 0 : __be32 val, *vp;
204 : 0 : vp = iov->iov_base;
205 : 0 : val = *vp++;
206 : 0 : iov->iov_base = (void*)vp;
207 : 0 : iov->iov_len -= sizeof(__be32);
208 [ # # # # : 0 : return val;
# # # # #
# # # ]
209 : : }
210 : :
211 : : static inline void svc_ungetu32(struct kvec *iov)
212 : : {
213 : : __be32 *vp = (__be32 *)iov->iov_base;
214 : : iov->iov_base = (void *)(vp - 1);
215 : : iov->iov_len += sizeof(*vp);
216 : : }
217 : :
218 : 0 : static inline void svc_putu32(struct kvec *iov, __be32 val)
219 : : {
220 : 0 : __be32 *vp = iov->iov_base + iov->iov_len;
221 : 0 : *vp = val;
222 [ # # ]: 0 : iov->iov_len += sizeof(__be32);
223 : : }
224 : :
225 : : /*
226 : : * The context of a single thread, including the request currently being
227 : : * processed.
228 : : */
229 : : struct svc_rqst {
230 : : struct list_head rq_all; /* all threads list */
231 : : struct rcu_head rq_rcu_head; /* for RCU deferred kfree */
232 : : struct svc_xprt * rq_xprt; /* transport ptr */
233 : :
234 : : struct sockaddr_storage rq_addr; /* peer address */
235 : : size_t rq_addrlen;
236 : : struct sockaddr_storage rq_daddr; /* dest addr of request
237 : : * - reply from here */
238 : : size_t rq_daddrlen;
239 : :
240 : : struct svc_serv * rq_server; /* RPC service definition */
241 : : struct svc_pool * rq_pool; /* thread pool */
242 : : const struct svc_procedure *rq_procinfo;/* procedure info */
243 : : struct auth_ops * rq_authop; /* authentication flavour */
244 : : struct svc_cred rq_cred; /* auth info */
245 : : void * rq_xprt_ctxt; /* transport specific context ptr */
246 : : struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */
247 : :
248 : : size_t rq_xprt_hlen; /* xprt header len */
249 : : struct xdr_buf rq_arg;
250 : : struct xdr_buf rq_res;
251 : : struct page *rq_pages[RPCSVC_MAXPAGES + 1];
252 : : struct page * *rq_respages; /* points into rq_pages */
253 : : struct page * *rq_next_page; /* next reply page to use */
254 : : struct page * *rq_page_end; /* one past the last page */
255 : :
256 : : struct kvec rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */
257 : :
258 : : __be32 rq_xid; /* transmission id */
259 : : u32 rq_prog; /* program number */
260 : : u32 rq_vers; /* program version */
261 : : u32 rq_proc; /* procedure number */
262 : : u32 rq_prot; /* IP protocol */
263 : : int rq_cachetype; /* catering to nfsd */
264 : : #define RQ_SECURE (0) /* secure port */
265 : : #define RQ_LOCAL (1) /* local request */
266 : : #define RQ_USEDEFERRAL (2) /* use deferral */
267 : : #define RQ_DROPME (3) /* drop current reply */
268 : : #define RQ_SPLICE_OK (4) /* turned off in gss privacy
269 : : * to prevent encrypting page
270 : : * cache pages */
271 : : #define RQ_VICTIM (5) /* about to be shut down */
272 : : #define RQ_BUSY (6) /* request is busy */
273 : : #define RQ_DATA (7) /* request has data */
274 : : #define RQ_AUTHERR (8) /* Request status is auth error */
275 : : unsigned long rq_flags; /* flags field */
276 : : ktime_t rq_qtime; /* enqueue time */
277 : :
278 : : void * rq_argp; /* decoded arguments */
279 : : void * rq_resp; /* xdr'd results */
280 : : void * rq_auth_data; /* flavor-specific data */
281 : : int rq_auth_slack; /* extra space xdr code
282 : : * should leave in head
283 : : * for krb5i, krb5p.
284 : : */
285 : : int rq_reserved; /* space on socket outq
286 : : * reserved for this request
287 : : */
288 : : ktime_t rq_stime; /* start time */
289 : :
290 : : struct cache_req rq_chandle; /* handle passed to caches for
291 : : * request delaying
292 : : */
293 : : /* Catering to nfsd */
294 : : struct auth_domain * rq_client; /* RPC peer info */
295 : : struct auth_domain * rq_gssclient; /* "gss/"-style peer info */
296 : : struct svc_cacherep * rq_cacherep; /* cache info */
297 : : struct task_struct *rq_task; /* service thread */
298 : : spinlock_t rq_lock; /* per-request lock */
299 : : struct net *rq_bc_net; /* pointer to backchannel's
300 : : * net namespace
301 : : */
302 : : };
303 : :
304 : : #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
305 : :
306 : : /*
307 : : * Rigorous type checking on sockaddr type conversions
308 : : */
309 : 0 : static inline struct sockaddr_in *svc_addr_in(const struct svc_rqst *rqst)
310 : : {
311 [ # # ]: 0 : return (struct sockaddr_in *) &rqst->rq_addr;
312 : : }
313 : :
314 : 0 : static inline struct sockaddr_in6 *svc_addr_in6(const struct svc_rqst *rqst)
315 : : {
316 : 0 : return (struct sockaddr_in6 *) &rqst->rq_addr;
317 : : }
318 : :
319 : 0 : static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst)
320 : : {
321 [ # # # ]: 0 : return (struct sockaddr *) &rqst->rq_addr;
322 : : }
323 : :
324 : 0 : static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst)
325 : : {
326 [ # # ]: 0 : return (struct sockaddr_in *) &rqst->rq_daddr;
327 : : }
328 : :
329 : 0 : static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst)
330 : : {
331 [ # # ]: 0 : return (struct sockaddr_in6 *) &rqst->rq_daddr;
332 : : }
333 : :
334 : 0 : static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst)
335 : : {
336 [ # # # ]: 0 : return (struct sockaddr *) &rqst->rq_daddr;
337 : : }
338 : :
339 : : /*
340 : : * Check buffer bounds after decoding arguments
341 : : */
342 : : static inline int
343 : 0 : xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p)
344 : : {
345 : 0 : char *cp = (char *)p;
346 : 0 : struct kvec *vec = &rqstp->rq_arg.head[0];
347 : 0 : return cp >= (char*)vec->iov_base
348 [ # # # # : 0 : && cp <= (char*)vec->iov_base + vec->iov_len;
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # ]
349 : : }
350 : :
351 : : static inline int
352 : 0 : xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p)
353 : : {
354 : 0 : struct kvec *vec = &rqstp->rq_res.head[0];
355 : 0 : char *cp = (char*)p;
356 : :
357 : 0 : vec->iov_len = cp - (char*)vec->iov_base;
358 : :
359 [ # # # # : 0 : return vec->iov_len <= PAGE_SIZE;
# # ]
360 : : }
361 : :
362 : : static inline void svc_free_res_pages(struct svc_rqst *rqstp)
363 : : {
364 : : while (rqstp->rq_next_page != rqstp->rq_respages) {
365 : : struct page **pp = --rqstp->rq_next_page;
366 : : if (*pp) {
367 : : put_page(*pp);
368 : : *pp = NULL;
369 : : }
370 : : }
371 : : }
372 : :
373 : : struct svc_deferred_req {
374 : : u32 prot; /* protocol (UDP or TCP) */
375 : : struct svc_xprt *xprt;
376 : : struct sockaddr_storage addr; /* where reply must go */
377 : : size_t addrlen;
378 : : struct sockaddr_storage daddr; /* where reply must come from */
379 : : size_t daddrlen;
380 : : struct cache_deferred_req handle;
381 : : size_t xprt_hlen;
382 : : int argslen;
383 : : __be32 args[0];
384 : : };
385 : :
386 : : struct svc_process_info {
387 : : union {
388 : : int (*dispatch)(struct svc_rqst *, __be32 *);
389 : : struct {
390 : : unsigned int lovers;
391 : : unsigned int hivers;
392 : : } mismatch;
393 : : };
394 : : };
395 : :
396 : : /*
397 : : * List of RPC programs on the same transport endpoint
398 : : */
399 : : struct svc_program {
400 : : struct svc_program * pg_next; /* other programs (same xprt) */
401 : : u32 pg_prog; /* program number */
402 : : unsigned int pg_lovers; /* lowest version */
403 : : unsigned int pg_hivers; /* highest version */
404 : : unsigned int pg_nvers; /* number of versions */
405 : : const struct svc_version **pg_vers; /* version array */
406 : : char * pg_name; /* service name */
407 : : char * pg_class; /* class name: services sharing authentication */
408 : : struct svc_stat * pg_stats; /* rpc statistics */
409 : : int (*pg_authenticate)(struct svc_rqst *);
410 : : __be32 (*pg_init_request)(struct svc_rqst *,
411 : : const struct svc_program *,
412 : : struct svc_process_info *);
413 : : int (*pg_rpcbind_set)(struct net *net,
414 : : const struct svc_program *,
415 : : u32 version, int family,
416 : : unsigned short proto,
417 : : unsigned short port);
418 : : };
419 : :
420 : : /*
421 : : * RPC program version
422 : : */
423 : : struct svc_version {
424 : : u32 vs_vers; /* version number */
425 : : u32 vs_nproc; /* number of procedures */
426 : : const struct svc_procedure *vs_proc; /* per-procedure info */
427 : : unsigned int *vs_count; /* call counts */
428 : : u32 vs_xdrsize; /* xdrsize needed for this version */
429 : :
430 : : /* Don't register with rpcbind */
431 : : bool vs_hidden;
432 : :
433 : : /* Don't care if the rpcbind registration fails */
434 : : bool vs_rpcb_optnl;
435 : :
436 : : /* Need xprt with congestion control */
437 : : bool vs_need_cong_ctrl;
438 : :
439 : : /* Override dispatch function (e.g. when caching replies).
440 : : * A return value of 0 means drop the request.
441 : : * vs_dispatch == NULL means use default dispatcher.
442 : : */
443 : : int (*vs_dispatch)(struct svc_rqst *, __be32 *);
444 : : };
445 : :
446 : : /*
447 : : * RPC procedure info
448 : : */
449 : : struct svc_procedure {
450 : : /* process the request: */
451 : : __be32 (*pc_func)(struct svc_rqst *);
452 : : /* XDR decode args: */
453 : : int (*pc_decode)(struct svc_rqst *, __be32 *data);
454 : : /* XDR encode result: */
455 : : int (*pc_encode)(struct svc_rqst *, __be32 *data);
456 : : /* XDR free result: */
457 : : void (*pc_release)(struct svc_rqst *);
458 : : unsigned int pc_argsize; /* argument struct size */
459 : : unsigned int pc_ressize; /* result struct size */
460 : : unsigned int pc_cachetype; /* cache info (NFS) */
461 : : unsigned int pc_xdrressize; /* maximum size of XDR reply */
462 : : };
463 : :
464 : : /*
465 : : * Mode for mapping cpus to pools.
466 : : */
467 : : enum {
468 : : SVC_POOL_AUTO = -1, /* choose one of the others */
469 : : SVC_POOL_GLOBAL, /* no mapping, just a single global pool
470 : : * (legacy & UP mode) */
471 : : SVC_POOL_PERCPU, /* one pool per cpu */
472 : : SVC_POOL_PERNODE /* one pool per numa node */
473 : : };
474 : :
475 : : struct svc_pool_map {
476 : : int count; /* How many svc_servs use us */
477 : : int mode; /* Note: int not enum to avoid
478 : : * warnings about "enumeration value
479 : : * not handled in switch" */
480 : : unsigned int npools;
481 : : unsigned int *pool_to; /* maps pool id to cpu or node */
482 : : unsigned int *to_pool; /* maps cpu or node to pool id */
483 : : };
484 : :
485 : : extern struct svc_pool_map svc_pool_map;
486 : :
487 : : /*
488 : : * Function prototypes.
489 : : */
490 : : int svc_rpcb_setup(struct svc_serv *serv, struct net *net);
491 : : void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);
492 : : int svc_bind(struct svc_serv *serv, struct net *net);
493 : : struct svc_serv *svc_create(struct svc_program *, unsigned int,
494 : : const struct svc_serv_ops *);
495 : : struct svc_rqst *svc_rqst_alloc(struct svc_serv *serv,
496 : : struct svc_pool *pool, int node);
497 : : struct svc_rqst *svc_prepare_thread(struct svc_serv *serv,
498 : : struct svc_pool *pool, int node);
499 : : void svc_rqst_free(struct svc_rqst *);
500 : : void svc_exit_thread(struct svc_rqst *);
501 : : unsigned int svc_pool_map_get(void);
502 : : void svc_pool_map_put(void);
503 : : struct svc_serv * svc_create_pooled(struct svc_program *, unsigned int,
504 : : const struct svc_serv_ops *);
505 : : int svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
506 : : int svc_set_num_threads_sync(struct svc_serv *, struct svc_pool *, int);
507 : : int svc_pool_stats_open(struct svc_serv *serv, struct file *file);
508 : : void svc_destroy(struct svc_serv *);
509 : : void svc_shutdown_net(struct svc_serv *, struct net *);
510 : : int svc_process(struct svc_rqst *);
511 : : int bc_svc_process(struct svc_serv *, struct rpc_rqst *,
512 : : struct svc_rqst *);
513 : : int svc_register(const struct svc_serv *, struct net *, const int,
514 : : const unsigned short, const unsigned short);
515 : :
516 : : void svc_wake_up(struct svc_serv *);
517 : : void svc_reserve(struct svc_rqst *rqstp, int space);
518 : : struct svc_pool * svc_pool_for_cpu(struct svc_serv *serv, int cpu);
519 : : char * svc_print_addr(struct svc_rqst *, char *, size_t);
520 : : unsigned int svc_fill_write_vector(struct svc_rqst *rqstp,
521 : : struct page **pages,
522 : : struct kvec *first, size_t total);
523 : : char *svc_fill_symlink_pathname(struct svc_rqst *rqstp,
524 : : struct kvec *first, void *p,
525 : : size_t total);
526 : : __be32 svc_return_autherr(struct svc_rqst *rqstp, __be32 auth_err);
527 : : __be32 svc_generic_init_request(struct svc_rqst *rqstp,
528 : : const struct svc_program *progp,
529 : : struct svc_process_info *procinfo);
530 : : int svc_generic_rpcbind_set(struct net *net,
531 : : const struct svc_program *progp,
532 : : u32 version, int family,
533 : : unsigned short proto,
534 : : unsigned short port);
535 : : int svc_rpcbind_set_version(struct net *net,
536 : : const struct svc_program *progp,
537 : : u32 version, int family,
538 : : unsigned short proto,
539 : : unsigned short port);
540 : :
541 : : #define RPC_MAX_ADDRBUFLEN (63U)
542 : :
543 : : /*
544 : : * When we want to reduce the size of the reserved space in the response
545 : : * buffer, we need to take into account the size of any checksum data that
546 : : * may be at the end of the packet. This is difficult to determine exactly
547 : : * for all cases without actually generating the checksum, so we just use a
548 : : * static value.
549 : : */
550 : 0 : static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
551 : : {
552 : 0 : svc_reserve(rqstp, space + rqstp->rq_auth_slack);
553 : 0 : }
554 : :
555 : : #endif /* SUNRPC_SVC_H */
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