1 /* 2 * linux/fs/lockd/xdr.c 3 * 4 * XDR support for lockd and the lock client. 5 * 6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 7 */ 8 9 #include <linux/types.h> 10 #include <linux/sched.h> 11 #include <linux/nfs.h> 12 13 #include <linux/sunrpc/xdr.h> 14 #include <linux/sunrpc/clnt.h> 15 #include <linux/sunrpc/svc.h> 16 #include <linux/sunrpc/stats.h> 17 #include <linux/lockd/lockd.h> 18 19 #include <uapi/linux/nfs2.h> 20 21 #define NLMDBG_FACILITY NLMDBG_XDR 22 23 24 static inline loff_t 25 s32_to_loff_t(__s32 offset) 26 { 27 return (loff_t)offset; 28 } 29 30 static inline __s32 31 loff_t_to_s32(loff_t offset) 32 { 33 __s32 res; 34 if (offset >= NLM_OFFSET_MAX) 35 res = NLM_OFFSET_MAX; 36 else if (offset <= -NLM_OFFSET_MAX) 37 res = -NLM_OFFSET_MAX; 38 else 39 res = offset; 40 return res; 41 } 42 43 /* 44 * XDR functions for basic NLM types 45 */ 46 static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c) 47 { 48 unsigned int len; 49 50 len = ntohl(*p++); 51 52 if(len==0) 53 { 54 c->len=4; 55 memset(c->data, 0, 4); /* hockeypux brain damage */ 56 } 57 else if(len<=NLM_MAXCOOKIELEN) 58 { 59 c->len=len; 60 memcpy(c->data, p, len); 61 p+=XDR_QUADLEN(len); 62 } 63 else 64 { 65 dprintk("lockd: bad cookie size %d (only cookies under " 66 "%d bytes are supported.)\n", 67 len, NLM_MAXCOOKIELEN); 68 return NULL; 69 } 70 return p; 71 } 72 73 static inline __be32 * 74 nlm_encode_cookie(__be32 *p, struct nlm_cookie *c) 75 { 76 *p++ = htonl(c->len); 77 memcpy(p, c->data, c->len); 78 p+=XDR_QUADLEN(c->len); 79 return p; 80 } 81 82 static __be32 * 83 nlm_decode_fh(__be32 *p, struct nfs_fh *f) 84 { 85 unsigned int len; 86 87 if ((len = ntohl(*p++)) != NFS2_FHSIZE) { 88 dprintk("lockd: bad fhandle size %d (should be %d)\n", 89 len, NFS2_FHSIZE); 90 return NULL; 91 } 92 f->size = NFS2_FHSIZE; 93 memset(f->data, 0, sizeof(f->data)); 94 memcpy(f->data, p, NFS2_FHSIZE); 95 return p + XDR_QUADLEN(NFS2_FHSIZE); 96 } 97 98 static inline __be32 * 99 nlm_encode_fh(__be32 *p, struct nfs_fh *f) 100 { 101 *p++ = htonl(NFS2_FHSIZE); 102 memcpy(p, f->data, NFS2_FHSIZE); 103 return p + XDR_QUADLEN(NFS2_FHSIZE); 104 } 105 106 /* 107 * Encode and decode owner handle 108 */ 109 static inline __be32 * 110 nlm_decode_oh(__be32 *p, struct xdr_netobj *oh) 111 { 112 return xdr_decode_netobj(p, oh); 113 } 114 115 static inline __be32 * 116 nlm_encode_oh(__be32 *p, struct xdr_netobj *oh) 117 { 118 return xdr_encode_netobj(p, oh); 119 } 120 121 static __be32 * 122 nlm_decode_lock(__be32 *p, struct nlm_lock *lock) 123 { 124 struct file_lock *fl = &lock->fl; 125 s32 start, len, end; 126 127 if (!(p = xdr_decode_string_inplace(p, &lock->caller, 128 &lock->len, 129 NLM_MAXSTRLEN)) 130 || !(p = nlm_decode_fh(p, &lock->fh)) 131 || !(p = nlm_decode_oh(p, &lock->oh))) 132 return NULL; 133 lock->svid = ntohl(*p++); 134 135 locks_init_lock(fl); 136 fl->fl_owner = current->files; 137 fl->fl_pid = (pid_t)lock->svid; 138 fl->fl_flags = FL_POSIX; 139 fl->fl_type = F_RDLCK; /* as good as anything else */ 140 start = ntohl(*p++); 141 len = ntohl(*p++); 142 end = start + len - 1; 143 144 fl->fl_start = s32_to_loff_t(start); 145 146 if (len == 0 || end < 0) 147 fl->fl_end = OFFSET_MAX; 148 else 149 fl->fl_end = s32_to_loff_t(end); 150 return p; 151 } 152 153 /* 154 * Encode result of a TEST/TEST_MSG call 155 */ 156 static __be32 * 157 nlm_encode_testres(__be32 *p, struct nlm_res *resp) 158 { 159 s32 start, len; 160 161 if (!(p = nlm_encode_cookie(p, &resp->cookie))) 162 return NULL; 163 *p++ = resp->status; 164 165 if (resp->status == nlm_lck_denied) { 166 struct file_lock *fl = &resp->lock.fl; 167 168 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one; 169 *p++ = htonl(resp->lock.svid); 170 171 /* Encode owner handle. */ 172 if (!(p = xdr_encode_netobj(p, &resp->lock.oh))) 173 return NULL; 174 175 start = loff_t_to_s32(fl->fl_start); 176 if (fl->fl_end == OFFSET_MAX) 177 len = 0; 178 else 179 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1); 180 181 *p++ = htonl(start); 182 *p++ = htonl(len); 183 } 184 185 return p; 186 } 187 188 189 /* 190 * First, the server side XDR functions 191 */ 192 int 193 nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 194 { 195 u32 exclusive; 196 197 if (!(p = nlm_decode_cookie(p, &argp->cookie))) 198 return 0; 199 200 exclusive = ntohl(*p++); 201 if (!(p = nlm_decode_lock(p, &argp->lock))) 202 return 0; 203 if (exclusive) 204 argp->lock.fl.fl_type = F_WRLCK; 205 206 return xdr_argsize_check(rqstp, p); 207 } 208 209 int 210 nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) 211 { 212 if (!(p = nlm_encode_testres(p, resp))) 213 return 0; 214 return xdr_ressize_check(rqstp, p); 215 } 216 217 int 218 nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 219 { 220 u32 exclusive; 221 222 if (!(p = nlm_decode_cookie(p, &argp->cookie))) 223 return 0; 224 argp->block = ntohl(*p++); 225 exclusive = ntohl(*p++); 226 if (!(p = nlm_decode_lock(p, &argp->lock))) 227 return 0; 228 if (exclusive) 229 argp->lock.fl.fl_type = F_WRLCK; 230 argp->reclaim = ntohl(*p++); 231 argp->state = ntohl(*p++); 232 argp->monitor = 1; /* monitor client by default */ 233 234 return xdr_argsize_check(rqstp, p); 235 } 236 237 int 238 nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 239 { 240 u32 exclusive; 241 242 if (!(p = nlm_decode_cookie(p, &argp->cookie))) 243 return 0; 244 argp->block = ntohl(*p++); 245 exclusive = ntohl(*p++); 246 if (!(p = nlm_decode_lock(p, &argp->lock))) 247 return 0; 248 if (exclusive) 249 argp->lock.fl.fl_type = F_WRLCK; 250 return xdr_argsize_check(rqstp, p); 251 } 252 253 int 254 nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 255 { 256 if (!(p = nlm_decode_cookie(p, &argp->cookie)) 257 || !(p = nlm_decode_lock(p, &argp->lock))) 258 return 0; 259 argp->lock.fl.fl_type = F_UNLCK; 260 return xdr_argsize_check(rqstp, p); 261 } 262 263 int 264 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) 265 { 266 struct nlm_lock *lock = &argp->lock; 267 268 memset(lock, 0, sizeof(*lock)); 269 locks_init_lock(&lock->fl); 270 lock->svid = ~(u32) 0; 271 lock->fl.fl_pid = (pid_t)lock->svid; 272 273 if (!(p = nlm_decode_cookie(p, &argp->cookie)) 274 || !(p = xdr_decode_string_inplace(p, &lock->caller, 275 &lock->len, NLM_MAXSTRLEN)) 276 || !(p = nlm_decode_fh(p, &lock->fh)) 277 || !(p = nlm_decode_oh(p, &lock->oh))) 278 return 0; 279 argp->fsm_mode = ntohl(*p++); 280 argp->fsm_access = ntohl(*p++); 281 return xdr_argsize_check(rqstp, p); 282 } 283 284 int 285 nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) 286 { 287 if (!(p = nlm_encode_cookie(p, &resp->cookie))) 288 return 0; 289 *p++ = resp->status; 290 *p++ = xdr_zero; /* sequence argument */ 291 return xdr_ressize_check(rqstp, p); 292 } 293 294 int 295 nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) 296 { 297 if (!(p = nlm_encode_cookie(p, &resp->cookie))) 298 return 0; 299 *p++ = resp->status; 300 return xdr_ressize_check(rqstp, p); 301 } 302 303 int 304 nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp) 305 { 306 struct nlm_lock *lock = &argp->lock; 307 308 if (!(p = xdr_decode_string_inplace(p, &lock->caller, 309 &lock->len, NLM_MAXSTRLEN))) 310 return 0; 311 argp->state = ntohl(*p++); 312 return xdr_argsize_check(rqstp, p); 313 } 314 315 int 316 nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp) 317 { 318 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN))) 319 return 0; 320 argp->state = ntohl(*p++); 321 memcpy(&argp->priv.data, p, sizeof(argp->priv.data)); 322 p += XDR_QUADLEN(SM_PRIV_SIZE); 323 return xdr_argsize_check(rqstp, p); 324 } 325 326 int 327 nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) 328 { 329 if (!(p = nlm_decode_cookie(p, &resp->cookie))) 330 return 0; 331 resp->status = *p++; 332 return xdr_argsize_check(rqstp, p); 333 } 334 335 int 336 nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 337 { 338 return xdr_argsize_check(rqstp, p); 339 } 340 341 int 342 nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 343 { 344 return xdr_ressize_check(rqstp, p); 345 } 346