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Linux/include/linux/sunrpc/svc.h

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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                                                  * '' 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         struct svc_xprt         *sv_bc_xprt;    /* callback on fore channel */
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 static inline void svc_get(struct svc_serv *serv)
123 {
124         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 static inline u32 svc_getnl(struct kvec *iov)
185 {
186         __be32 val, *vp;
187         vp = iov->iov_base;
188         val = *vp++;
189         iov->iov_base = (void*)vp;
190         iov->iov_len -= sizeof(__be32);
191         return ntohl(val);
192 }
193 
194 static inline void svc_putnl(struct kvec *iov, u32 val)
195 {
196         __be32 *vp = iov->iov_base + iov->iov_len;
197         *vp = htonl(val);
198         iov->iov_len += sizeof(__be32);
199 }
200 
201 static inline __be32 svc_getu32(struct kvec *iov)
202 {
203         __be32 val, *vp;
204         vp = iov->iov_base;
205         val = *vp++;
206         iov->iov_base = (void*)vp;
207         iov->iov_len -= sizeof(__be32);
208         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 static inline void svc_putu32(struct kvec *iov, __be32 val)
219 {
220         __be32 *vp = iov->iov_base + iov->iov_len;
221         *vp = val;
222         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         unsigned long           rq_flags;       /* flags field */
275         ktime_t                 rq_qtime;       /* enqueue time */
276 
277         void *                  rq_argp;        /* decoded arguments */
278         void *                  rq_resp;        /* xdr'd results */
279         void *                  rq_auth_data;   /* flavor-specific data */
280         int                     rq_auth_slack;  /* extra space xdr code
281                                                  * should leave in head
282                                                  * for krb5i, krb5p.
283                                                  */
284         int                     rq_reserved;    /* space on socket outq
285                                                  * reserved for this request
286                                                  */
287         ktime_t                 rq_stime;       /* start time */
288 
289         struct cache_req        rq_chandle;     /* handle passed to caches for 
290                                                  * request delaying 
291                                                  */
292         /* Catering to nfsd */
293         struct auth_domain *    rq_client;      /* RPC peer info */
294         struct auth_domain *    rq_gssclient;   /* "gss/"-style peer info */
295         struct svc_cacherep *   rq_cacherep;    /* cache info */
296         struct task_struct      *rq_task;       /* service thread */
297         spinlock_t              rq_lock;        /* per-request lock */
298         struct net              *rq_bc_net;     /* pointer to backchannel's
299                                                  * net namespace
300                                                  */
301 };
302 
303 #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
304 
305 /*
306  * Rigorous type checking on sockaddr type conversions
307  */
308 static inline struct sockaddr_in *svc_addr_in(const struct svc_rqst *rqst)
309 {
310         return (struct sockaddr_in *) &rqst->rq_addr;
311 }
312 
313 static inline struct sockaddr_in6 *svc_addr_in6(const struct svc_rqst *rqst)
314 {
315         return (struct sockaddr_in6 *) &rqst->rq_addr;
316 }
317 
318 static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst)
319 {
320         return (struct sockaddr *) &rqst->rq_addr;
321 }
322 
323 static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst)
324 {
325         return (struct sockaddr_in *) &rqst->rq_daddr;
326 }
327 
328 static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst)
329 {
330         return (struct sockaddr_in6 *) &rqst->rq_daddr;
331 }
332 
333 static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst)
334 {
335         return (struct sockaddr *) &rqst->rq_daddr;
336 }
337 
338 /*
339  * Check buffer bounds after decoding arguments
340  */
341 static inline int
342 xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p)
343 {
344         char *cp = (char *)p;
345         struct kvec *vec = &rqstp->rq_arg.head[0];
346         return cp >= (char*)vec->iov_base
347                 && cp <= (char*)vec->iov_base + vec->iov_len;
348 }
349 
350 static inline int
351 xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p)
352 {
353         struct kvec *vec = &rqstp->rq_res.head[0];
354         char *cp = (char*)p;
355 
356         vec->iov_len = cp - (char*)vec->iov_base;
357 
358         return vec->iov_len <= PAGE_SIZE;
359 }
360 
361 static inline void svc_free_res_pages(struct svc_rqst *rqstp)
362 {
363         while (rqstp->rq_next_page != rqstp->rq_respages) {
364                 struct page **pp = --rqstp->rq_next_page;
365                 if (*pp) {
366                         put_page(*pp);
367                         *pp = NULL;
368                 }
369         }
370 }
371 
372 struct svc_deferred_req {
373         u32                     prot;   /* protocol (UDP or TCP) */
374         struct svc_xprt         *xprt;
375         struct sockaddr_storage addr;   /* where reply must go */
376         size_t                  addrlen;
377         struct sockaddr_storage daddr;  /* where reply must come from */
378         size_t                  daddrlen;
379         struct cache_deferred_req handle;
380         size_t                  xprt_hlen;
381         int                     argslen;
382         __be32                  args[0];
383 };
384 
385 /*
386  * List of RPC programs on the same transport endpoint
387  */
388 struct svc_program {
389         struct svc_program *    pg_next;        /* other programs (same xprt) */
390         u32                     pg_prog;        /* program number */
391         unsigned int            pg_lovers;      /* lowest version */
392         unsigned int            pg_hivers;      /* highest version */
393         unsigned int            pg_nvers;       /* number of versions */
394         const struct svc_version **pg_vers;     /* version array */
395         char *                  pg_name;        /* service name */
396         char *                  pg_class;       /* class name: services sharing authentication */
397         struct svc_stat *       pg_stats;       /* rpc statistics */
398         int                     (*pg_authenticate)(struct svc_rqst *);
399 };
400 
401 /*
402  * RPC program version
403  */
404 struct svc_version {
405         u32                     vs_vers;        /* version number */
406         u32                     vs_nproc;       /* number of procedures */
407         const struct svc_procedure *vs_proc;    /* per-procedure info */
408         unsigned int            *vs_count;      /* call counts */
409         u32                     vs_xdrsize;     /* xdrsize needed for this version */
410 
411         /* Don't register with rpcbind */
412         bool                    vs_hidden;
413 
414         /* Don't care if the rpcbind registration fails */
415         bool                    vs_rpcb_optnl;
416 
417         /* Need xprt with congestion control */
418         bool                    vs_need_cong_ctrl;
419 
420         /* Override dispatch function (e.g. when caching replies).
421          * A return value of 0 means drop the request. 
422          * vs_dispatch == NULL means use default dispatcher.
423          */
424         int                     (*vs_dispatch)(struct svc_rqst *, __be32 *);
425 };
426 
427 /*
428  * RPC procedure info
429  */
430 struct svc_procedure {
431         /* process the request: */
432         __be32                  (*pc_func)(struct svc_rqst *);
433         /* XDR decode args: */
434         int                     (*pc_decode)(struct svc_rqst *, __be32 *data);
435         /* XDR encode result: */
436         int                     (*pc_encode)(struct svc_rqst *, __be32 *data);
437         /* XDR free result: */
438         void                    (*pc_release)(struct svc_rqst *);
439         unsigned int            pc_argsize;     /* argument struct size */
440         unsigned int            pc_ressize;     /* result struct size */
441         unsigned int            pc_cachetype;   /* cache info (NFS) */
442         unsigned int            pc_xdrressize;  /* maximum size of XDR reply */
443 };
444 
445 /*
446  * Mode for mapping cpus to pools.
447  */
448 enum {
449         SVC_POOL_AUTO = -1,     /* choose one of the others */
450         SVC_POOL_GLOBAL,        /* no mapping, just a single global pool
451                                  * (legacy & UP mode) */
452         SVC_POOL_PERCPU,        /* one pool per cpu */
453         SVC_POOL_PERNODE        /* one pool per numa node */
454 };
455 
456 struct svc_pool_map {
457         int count;                      /* How many svc_servs use us */
458         int mode;                       /* Note: int not enum to avoid
459                                          * warnings about "enumeration value
460                                          * not handled in switch" */
461         unsigned int npools;
462         unsigned int *pool_to;          /* maps pool id to cpu or node */
463         unsigned int *to_pool;          /* maps cpu or node to pool id */
464 };
465 
466 extern struct svc_pool_map svc_pool_map;
467 
468 /*
469  * Function prototypes.
470  */
471 int svc_rpcb_setup(struct svc_serv *serv, struct net *net);
472 void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);
473 int svc_bind(struct svc_serv *serv, struct net *net);
474 struct svc_serv *svc_create(struct svc_program *, unsigned int,
475                             const struct svc_serv_ops *);
476 struct svc_rqst *svc_rqst_alloc(struct svc_serv *serv,
477                                         struct svc_pool *pool, int node);
478 struct svc_rqst *svc_prepare_thread(struct svc_serv *serv,
479                                         struct svc_pool *pool, int node);
480 void               svc_rqst_free(struct svc_rqst *);
481 void               svc_exit_thread(struct svc_rqst *);
482 unsigned int       svc_pool_map_get(void);
483 void               svc_pool_map_put(void);
484 struct svc_serv *  svc_create_pooled(struct svc_program *, unsigned int,
485                         const struct svc_serv_ops *);
486 int                svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
487 int                svc_set_num_threads_sync(struct svc_serv *, struct svc_pool *, int);
488 int                svc_pool_stats_open(struct svc_serv *serv, struct file *file);
489 void               svc_destroy(struct svc_serv *);
490 void               svc_shutdown_net(struct svc_serv *, struct net *);
491 int                svc_process(struct svc_rqst *);
492 int                bc_svc_process(struct svc_serv *, struct rpc_rqst *,
493                         struct svc_rqst *);
494 int                svc_register(const struct svc_serv *, struct net *, const int,
495                                 const unsigned short, const unsigned short);
496 
497 void               svc_wake_up(struct svc_serv *);
498 void               svc_reserve(struct svc_rqst *rqstp, int space);
499 struct svc_pool *  svc_pool_for_cpu(struct svc_serv *serv, int cpu);
500 char *             svc_print_addr(struct svc_rqst *, char *, size_t);
501 unsigned int       svc_fill_write_vector(struct svc_rqst *rqstp,
502                                          struct page **pages,
503                                          struct kvec *first, size_t total);
504 char              *svc_fill_symlink_pathname(struct svc_rqst *rqstp,
505                                              struct kvec *first, void *p,
506                                              size_t total);
507 
508 #define RPC_MAX_ADDRBUFLEN      (63U)
509 
510 /*
511  * When we want to reduce the size of the reserved space in the response
512  * buffer, we need to take into account the size of any checksum data that
513  * may be at the end of the packet. This is difficult to determine exactly
514  * for all cases without actually generating the checksum, so we just use a
515  * static value.
516  */
517 static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
518 {
519         svc_reserve(rqstp, space + rqstp->rq_auth_slack);
520 }
521 
522 #endif /* SUNRPC_SVC_H */
523 

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