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