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1da177e4 LT |
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/sunrpc/types.h> | |
15 | #include <linux/sunrpc/xdr.h> | |
16 | #include <linux/sunrpc/svcauth.h> | |
17 | #include <linux/wait.h> | |
18 | #include <linux/mm.h> | |
19 | ||
20 | /* | |
21 | * RPC service. | |
22 | * | |
23 | * An RPC service is a ``daemon,'' possibly multithreaded, which | |
24 | * receives and processes incoming RPC messages. | |
25 | * It has one or more transport sockets associated with it, and maintains | |
26 | * a list of idle threads waiting for input. | |
27 | * | |
28 | * We currently do not support more than one RPC program per daemon. | |
29 | */ | |
30 | struct svc_serv { | |
31 | struct list_head sv_threads; /* idle server threads */ | |
32 | struct list_head sv_sockets; /* pending sockets */ | |
33 | struct svc_program * sv_program; /* RPC program */ | |
34 | struct svc_stat * sv_stats; /* RPC statistics */ | |
35 | spinlock_t sv_lock; | |
36 | unsigned int sv_nrthreads; /* # of server threads */ | |
37 | unsigned int sv_bufsz; /* datagram buffer size */ | |
38 | unsigned int sv_xdrsize; /* XDR buffer size */ | |
39 | ||
40 | struct list_head sv_permsocks; /* all permanent sockets */ | |
41 | struct list_head sv_tempsocks; /* all temporary sockets */ | |
42 | int sv_tmpcnt; /* count of temporary sockets */ | |
43 | ||
44 | char * sv_name; /* service name */ | |
45 | }; | |
46 | ||
47 | /* | |
48 | * Maximum payload size supported by a kernel RPC server. | |
49 | * This is use to determine the max number of pages nfsd is | |
50 | * willing to return in a single READ operation. | |
51 | */ | |
52 | #define RPCSVC_MAXPAYLOAD (64*1024u) | |
53 | ||
54 | /* | |
55 | * RPC Requsts and replies are stored in one or more pages. | |
56 | * We maintain an array of pages for each server thread. | |
57 | * Requests are copied into these pages as they arrive. Remaining | |
58 | * pages are available to write the reply into. | |
59 | * | |
60 | * Pages are sent using ->sendpage so each server thread needs to | |
61 | * allocate more to replace those used in sending. To help keep track | |
62 | * of these pages we have a receive list where all pages initialy live, | |
63 | * and a send list where pages are moved to when there are to be part | |
64 | * of a reply. | |
65 | * | |
66 | * We use xdr_buf for holding responses as it fits well with NFS | |
67 | * read responses (that have a header, and some data pages, and possibly | |
68 | * a tail) and means we can share some client side routines. | |
69 | * | |
70 | * The xdr_buf.head kvec always points to the first page in the rq_*pages | |
71 | * list. The xdr_buf.pages pointer points to the second page on that | |
72 | * list. xdr_buf.tail points to the end of the first page. | |
73 | * This assumes that the non-page part of an rpc reply will fit | |
74 | * in a page - NFSd ensures this. lockd also has no trouble. | |
75 | * | |
76 | * Each request/reply pair can have at most one "payload", plus two pages, | |
77 | * one for the request, and one for the reply. | |
78 | */ | |
79 | #define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 2) | |
80 | ||
81 | static inline u32 svc_getu32(struct kvec *iov) | |
82 | { | |
83 | u32 val, *vp; | |
84 | vp = iov->iov_base; | |
85 | val = *vp++; | |
86 | iov->iov_base = (void*)vp; | |
87 | iov->iov_len -= sizeof(u32); | |
88 | return val; | |
89 | } | |
90 | ||
91 | static inline void svc_ungetu32(struct kvec *iov) | |
92 | { | |
93 | u32 *vp = (u32 *)iov->iov_base; | |
94 | iov->iov_base = (void *)(vp - 1); | |
95 | iov->iov_len += sizeof(*vp); | |
96 | } | |
97 | ||
98 | static inline void svc_putu32(struct kvec *iov, u32 val) | |
99 | { | |
100 | u32 *vp = iov->iov_base + iov->iov_len; | |
101 | *vp = val; | |
102 | iov->iov_len += sizeof(u32); | |
103 | } | |
104 | ||
105 | ||
106 | /* | |
107 | * The context of a single thread, including the request currently being | |
108 | * processed. | |
109 | * NOTE: First two items must be prev/next. | |
110 | */ | |
111 | struct svc_rqst { | |
112 | struct list_head rq_list; /* idle list */ | |
113 | struct svc_sock * rq_sock; /* socket */ | |
114 | struct sockaddr_in rq_addr; /* peer address */ | |
115 | int rq_addrlen; | |
116 | ||
117 | struct svc_serv * rq_server; /* RPC service definition */ | |
118 | struct svc_procedure * rq_procinfo; /* procedure info */ | |
119 | struct auth_ops * rq_authop; /* authentication flavour */ | |
120 | struct svc_cred rq_cred; /* auth info */ | |
121 | struct sk_buff * rq_skbuff; /* fast recv inet buffer */ | |
122 | struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */ | |
123 | ||
124 | struct xdr_buf rq_arg; | |
125 | struct xdr_buf rq_res; | |
126 | struct page * rq_argpages[RPCSVC_MAXPAGES]; | |
127 | struct page * rq_respages[RPCSVC_MAXPAGES]; | |
128 | int rq_restailpage; | |
129 | short rq_argused; /* pages used for argument */ | |
130 | short rq_arghi; /* pages available in argument page list */ | |
131 | short rq_resused; /* pages used for result */ | |
132 | ||
133 | u32 rq_xid; /* transmission id */ | |
134 | u32 rq_prog; /* program number */ | |
135 | u32 rq_vers; /* program version */ | |
136 | u32 rq_proc; /* procedure number */ | |
137 | u32 rq_prot; /* IP protocol */ | |
138 | unsigned short | |
139 | rq_secure : 1; /* secure port */ | |
140 | ||
141 | ||
142 | __u32 rq_daddr; /* dest addr of request - reply from here */ | |
143 | ||
144 | void * rq_argp; /* decoded arguments */ | |
145 | void * rq_resp; /* xdr'd results */ | |
146 | void * rq_auth_data; /* flavor-specific data */ | |
147 | ||
148 | int rq_reserved; /* space on socket outq | |
149 | * reserved for this request | |
150 | */ | |
151 | ||
152 | struct cache_req rq_chandle; /* handle passed to caches for | |
153 | * request delaying | |
154 | */ | |
155 | /* Catering to nfsd */ | |
156 | struct auth_domain * rq_client; /* RPC peer info */ | |
157 | struct svc_cacherep * rq_cacherep; /* cache info */ | |
158 | struct knfsd_fh * rq_reffh; /* Referrence filehandle, used to | |
159 | * determine what device number | |
160 | * to report (real or virtual) | |
161 | */ | |
162 | ||
163 | wait_queue_head_t rq_wait; /* synchronization */ | |
164 | }; | |
165 | ||
166 | /* | |
167 | * Check buffer bounds after decoding arguments | |
168 | */ | |
169 | static inline int | |
170 | xdr_argsize_check(struct svc_rqst *rqstp, u32 *p) | |
171 | { | |
172 | char *cp = (char *)p; | |
173 | struct kvec *vec = &rqstp->rq_arg.head[0]; | |
0ba7536d N |
174 | return cp >= (char*)vec->iov_base |
175 | && cp <= (char*)vec->iov_base + vec->iov_len; | |
1da177e4 LT |
176 | } |
177 | ||
178 | static inline int | |
179 | xdr_ressize_check(struct svc_rqst *rqstp, u32 *p) | |
180 | { | |
181 | struct kvec *vec = &rqstp->rq_res.head[0]; | |
182 | char *cp = (char*)p; | |
183 | ||
184 | vec->iov_len = cp - (char*)vec->iov_base; | |
185 | ||
186 | return vec->iov_len <= PAGE_SIZE; | |
187 | } | |
188 | ||
a257cdd0 AG |
189 | static inline struct page * |
190 | svc_take_res_page(struct svc_rqst *rqstp) | |
191 | { | |
192 | if (rqstp->rq_arghi <= rqstp->rq_argused) | |
193 | return NULL; | |
194 | rqstp->rq_arghi--; | |
195 | rqstp->rq_respages[rqstp->rq_resused] = | |
196 | rqstp->rq_argpages[rqstp->rq_arghi]; | |
197 | return rqstp->rq_respages[rqstp->rq_resused++]; | |
198 | } | |
199 | ||
6f54e2d0 | 200 | static inline void svc_take_page(struct svc_rqst *rqstp) |
1da177e4 | 201 | { |
6f54e2d0 BF |
202 | if (rqstp->rq_arghi <= rqstp->rq_argused) { |
203 | WARN_ON(1); | |
204 | return; | |
205 | } | |
1da177e4 LT |
206 | rqstp->rq_arghi--; |
207 | rqstp->rq_respages[rqstp->rq_resused] = | |
208 | rqstp->rq_argpages[rqstp->rq_arghi]; | |
209 | rqstp->rq_resused++; | |
1da177e4 LT |
210 | } |
211 | ||
212 | static inline void svc_pushback_allpages(struct svc_rqst *rqstp) | |
213 | { | |
214 | while (rqstp->rq_resused) { | |
215 | if (rqstp->rq_respages[--rqstp->rq_resused] == NULL) | |
216 | continue; | |
217 | rqstp->rq_argpages[rqstp->rq_arghi++] = | |
218 | rqstp->rq_respages[rqstp->rq_resused]; | |
219 | rqstp->rq_respages[rqstp->rq_resused] = NULL; | |
220 | } | |
221 | } | |
222 | ||
223 | static inline void svc_pushback_unused_pages(struct svc_rqst *rqstp) | |
224 | { | |
225 | while (rqstp->rq_resused && | |
226 | rqstp->rq_res.pages != &rqstp->rq_respages[rqstp->rq_resused]) { | |
227 | ||
228 | if (rqstp->rq_respages[--rqstp->rq_resused] != NULL) { | |
229 | rqstp->rq_argpages[rqstp->rq_arghi++] = | |
230 | rqstp->rq_respages[rqstp->rq_resused]; | |
231 | rqstp->rq_respages[rqstp->rq_resused] = NULL; | |
232 | } | |
233 | } | |
234 | } | |
235 | ||
236 | static inline void svc_free_allpages(struct svc_rqst *rqstp) | |
237 | { | |
238 | while (rqstp->rq_resused) { | |
239 | if (rqstp->rq_respages[--rqstp->rq_resused] == NULL) | |
240 | continue; | |
241 | put_page(rqstp->rq_respages[rqstp->rq_resused]); | |
242 | rqstp->rq_respages[rqstp->rq_resused] = NULL; | |
243 | } | |
244 | } | |
245 | ||
246 | struct svc_deferred_req { | |
247 | u32 prot; /* protocol (UDP or TCP) */ | |
248 | struct sockaddr_in addr; | |
249 | struct svc_sock *svsk; /* where reply must go */ | |
1918e341 | 250 | u32 daddr; /* where reply must come from */ |
1da177e4 LT |
251 | struct cache_deferred_req handle; |
252 | int argslen; | |
253 | u32 args[0]; | |
254 | }; | |
255 | ||
256 | /* | |
9ba02638 | 257 | * List of RPC programs on the same transport endpoint |
1da177e4 LT |
258 | */ |
259 | struct svc_program { | |
9ba02638 | 260 | struct svc_program * pg_next; /* other programs (same xprt) */ |
1da177e4 LT |
261 | u32 pg_prog; /* program number */ |
262 | unsigned int pg_lovers; /* lowest version */ | |
263 | unsigned int pg_hivers; /* lowest version */ | |
264 | unsigned int pg_nvers; /* number of versions */ | |
265 | struct svc_version ** pg_vers; /* version array */ | |
266 | char * pg_name; /* service name */ | |
267 | char * pg_class; /* class name: services sharing authentication */ | |
268 | struct svc_stat * pg_stats; /* rpc statistics */ | |
269 | int (*pg_authenticate)(struct svc_rqst *); | |
270 | }; | |
271 | ||
272 | /* | |
273 | * RPC program version | |
274 | */ | |
275 | struct svc_version { | |
276 | u32 vs_vers; /* version number */ | |
277 | u32 vs_nproc; /* number of procedures */ | |
278 | struct svc_procedure * vs_proc; /* per-procedure info */ | |
279 | u32 vs_xdrsize; /* xdrsize needed for this version */ | |
280 | ||
281 | /* Override dispatch function (e.g. when caching replies). | |
282 | * A return value of 0 means drop the request. | |
283 | * vs_dispatch == NULL means use default dispatcher. | |
284 | */ | |
285 | int (*vs_dispatch)(struct svc_rqst *, u32 *); | |
286 | }; | |
287 | ||
288 | /* | |
289 | * RPC procedure info | |
290 | */ | |
291 | typedef int (*svc_procfunc)(struct svc_rqst *, void *argp, void *resp); | |
292 | struct svc_procedure { | |
293 | svc_procfunc pc_func; /* process the request */ | |
294 | kxdrproc_t pc_decode; /* XDR decode args */ | |
295 | kxdrproc_t pc_encode; /* XDR encode result */ | |
296 | kxdrproc_t pc_release; /* XDR free result */ | |
297 | unsigned int pc_argsize; /* argument struct size */ | |
298 | unsigned int pc_ressize; /* result struct size */ | |
299 | unsigned int pc_count; /* call count */ | |
300 | unsigned int pc_cachetype; /* cache info (NFS) */ | |
301 | unsigned int pc_xdrressize; /* maximum size of XDR reply */ | |
302 | }; | |
303 | ||
304 | /* | |
305 | * This is the RPC server thread function prototype | |
306 | */ | |
307 | typedef void (*svc_thread_fn)(struct svc_rqst *); | |
308 | ||
309 | /* | |
310 | * Function prototypes. | |
311 | */ | |
312 | struct svc_serv * svc_create(struct svc_program *, unsigned int); | |
313 | int svc_create_thread(svc_thread_fn, struct svc_serv *); | |
314 | void svc_exit_thread(struct svc_rqst *); | |
315 | void svc_destroy(struct svc_serv *); | |
316 | int svc_process(struct svc_serv *, struct svc_rqst *); | |
317 | int svc_register(struct svc_serv *, int, unsigned short); | |
318 | void svc_wake_up(struct svc_serv *); | |
319 | void svc_reserve(struct svc_rqst *rqstp, int space); | |
320 | ||
321 | #endif /* SUNRPC_SVC_H */ |