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36#include <linux/module.h>
37#include <linux/list.h>
38#include <linux/inet.h>
39#include <linux/errno.h>
40#include <linux/delay.h>
41#include <linux/sched.h>
42#include <linux/kthread.h>
43#include <linux/sunrpc/xdr.h>
44#include <linux/sunrpc/svc.h>
45#include <linux/sunrpc/clnt.h>
46#include <linux/nfsd/nfsd.h>
47#include <linux/nfsd/state.h>
48#include <linux/sunrpc/sched.h>
49#include <linux/nfs4.h>
50
51#define NFSDDBG_FACILITY NFSDDBG_PROC
52
53#define NFSPROC4_CB_NULL 0
54#define NFSPROC4_CB_COMPOUND 1
55
56
57static const struct rpc_call_ops nfs4_cb_null_ops;
58
59
60
61enum {
62 NFSPROC4_CLNT_CB_NULL = 0,
63 NFSPROC4_CLNT_CB_RECALL,
64};
65
66enum nfs_cb_opnum4 {
67 OP_CB_RECALL = 4,
68};
69
70#define NFS4_MAXTAGLEN 20
71
72#define NFS4_enc_cb_null_sz 0
73#define NFS4_dec_cb_null_sz 0
74#define cb_compound_enc_hdr_sz 4
75#define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2))
76#define op_enc_sz 1
77#define op_dec_sz 2
78#define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2))
79#define enc_stateid_sz (NFS4_STATEID_SIZE >> 2)
80#define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \
81 1 + enc_stateid_sz + \
82 enc_nfs4_fh_sz)
83
84#define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \
85 op_dec_sz)
86
87
88
89
90static inline __be32 *
91xdr_writemem(__be32 *p, const void *ptr, int nbytes)
92{
93 int tmp = XDR_QUADLEN(nbytes);
94 if (!tmp)
95 return p;
96 p[tmp-1] = 0;
97 memcpy(p, ptr, nbytes);
98 return p + tmp;
99}
100
101#define WRITE32(n) *p++ = htonl(n)
102#define WRITEMEM(ptr,nbytes) do { \
103 p = xdr_writemem(p, ptr, nbytes); \
104} while (0)
105#define RESERVE_SPACE(nbytes) do { \
106 p = xdr_reserve_space(xdr, nbytes); \
107 if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \
108 BUG_ON(!p); \
109} while (0)
110
111
112
113
114#define DECODE_TAIL \
115 status = 0; \
116out: \
117 return status; \
118xdr_error: \
119 dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \
120 status = -EIO; \
121 goto out
122
123#define READ32(x) (x) = ntohl(*p++)
124#define READ64(x) do { \
125 (x) = (u64)ntohl(*p++) << 32; \
126 (x) |= ntohl(*p++); \
127} while (0)
128#define READTIME(x) do { \
129 p++; \
130 (x.tv_sec) = ntohl(*p++); \
131 (x.tv_nsec) = ntohl(*p++); \
132} while (0)
133#define READ_BUF(nbytes) do { \
134 p = xdr_inline_decode(xdr, nbytes); \
135 if (!p) { \
136 dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
137 __func__, __LINE__); \
138 return -EIO; \
139 } \
140} while (0)
141
142struct nfs4_cb_compound_hdr {
143 int status;
144 u32 ident;
145 u32 nops;
146 u32 taglen;
147 char * tag;
148};
149
150static struct {
151int stat;
152int errno;
153} nfs_cb_errtbl[] = {
154 { NFS4_OK, 0 },
155 { NFS4ERR_PERM, EPERM },
156 { NFS4ERR_NOENT, ENOENT },
157 { NFS4ERR_IO, EIO },
158 { NFS4ERR_NXIO, ENXIO },
159 { NFS4ERR_ACCESS, EACCES },
160 { NFS4ERR_EXIST, EEXIST },
161 { NFS4ERR_XDEV, EXDEV },
162 { NFS4ERR_NOTDIR, ENOTDIR },
163 { NFS4ERR_ISDIR, EISDIR },
164 { NFS4ERR_INVAL, EINVAL },
165 { NFS4ERR_FBIG, EFBIG },
166 { NFS4ERR_NOSPC, ENOSPC },
167 { NFS4ERR_ROFS, EROFS },
168 { NFS4ERR_MLINK, EMLINK },
169 { NFS4ERR_NAMETOOLONG, ENAMETOOLONG },
170 { NFS4ERR_NOTEMPTY, ENOTEMPTY },
171 { NFS4ERR_DQUOT, EDQUOT },
172 { NFS4ERR_STALE, ESTALE },
173 { NFS4ERR_BADHANDLE, EBADHANDLE },
174 { NFS4ERR_BAD_COOKIE, EBADCOOKIE },
175 { NFS4ERR_NOTSUPP, ENOTSUPP },
176 { NFS4ERR_TOOSMALL, ETOOSMALL },
177 { NFS4ERR_SERVERFAULT, ESERVERFAULT },
178 { NFS4ERR_BADTYPE, EBADTYPE },
179 { NFS4ERR_LOCKED, EAGAIN },
180 { NFS4ERR_RESOURCE, EREMOTEIO },
181 { NFS4ERR_SYMLINK, ELOOP },
182 { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP },
183 { NFS4ERR_DEADLOCK, EDEADLK },
184 { -1, EIO }
185};
186
187static int
188nfs_cb_stat_to_errno(int stat)
189{
190 int i;
191 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
192 if (nfs_cb_errtbl[i].stat == stat)
193 return nfs_cb_errtbl[i].errno;
194 }
195
196
197
198
199
200 return stat;
201}
202
203
204
205
206
207static int
208encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
209{
210 __be32 * p;
211
212 RESERVE_SPACE(16);
213 WRITE32(0);
214 WRITE32(NFS4_MINOR_VERSION);
215 WRITE32(hdr->ident);
216 WRITE32(hdr->nops);
217 return 0;
218}
219
220static int
221encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec)
222{
223 __be32 *p;
224 int len = cb_rec->cbr_fhlen;
225
226 RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len);
227 WRITE32(OP_CB_RECALL);
228 WRITE32(cb_rec->cbr_stateid.si_generation);
229 WRITEMEM(&cb_rec->cbr_stateid.si_opaque, sizeof(stateid_opaque_t));
230 WRITE32(cb_rec->cbr_trunc);
231 WRITE32(len);
232 WRITEMEM(cb_rec->cbr_fhval, len);
233 return 0;
234}
235
236static int
237nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
238{
239 struct xdr_stream xdrs, *xdr = &xdrs;
240
241 xdr_init_encode(&xdrs, &req->rq_snd_buf, p);
242 RESERVE_SPACE(0);
243 return 0;
244}
245
246static int
247nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_cb_recall *args)
248{
249 struct xdr_stream xdr;
250 struct nfs4_cb_compound_hdr hdr = {
251 .ident = args->cbr_ident,
252 .nops = 1,
253 };
254
255 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
256 encode_cb_compound_hdr(&xdr, &hdr);
257 return (encode_cb_recall(&xdr, args));
258}
259
260
261static int
262decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){
263 __be32 *p;
264
265 READ_BUF(8);
266 READ32(hdr->status);
267 READ32(hdr->taglen);
268 READ_BUF(hdr->taglen + 4);
269 hdr->tag = (char *)p;
270 p += XDR_QUADLEN(hdr->taglen);
271 READ32(hdr->nops);
272 return 0;
273}
274
275static int
276decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
277{
278 __be32 *p;
279 u32 op;
280 int32_t nfserr;
281
282 READ_BUF(8);
283 READ32(op);
284 if (op != expected) {
285 dprintk("NFSD: decode_cb_op_hdr: Callback server returned "
286 " operation %d but we issued a request for %d\n",
287 op, expected);
288 return -EIO;
289 }
290 READ32(nfserr);
291 if (nfserr != NFS_OK)
292 return -nfs_cb_stat_to_errno(nfserr);
293 return 0;
294}
295
296static int
297nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
298{
299 return 0;
300}
301
302static int
303nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
304{
305 struct xdr_stream xdr;
306 struct nfs4_cb_compound_hdr hdr;
307 int status;
308
309 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
310 status = decode_cb_compound_hdr(&xdr, &hdr);
311 if (status)
312 goto out;
313 status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
314out:
315 return status;
316}
317
318
319
320
321#define PROC(proc, call, argtype, restype) \
322[NFSPROC4_CLNT_##proc] = { \
323 .p_proc = NFSPROC4_CB_##call, \
324 .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \
325 .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \
326 .p_arglen = NFS4_##argtype##_sz, \
327 .p_replen = NFS4_##restype##_sz, \
328 .p_statidx = NFSPROC4_CB_##call, \
329 .p_name = #proc, \
330}
331
332static struct rpc_procinfo nfs4_cb_procedures[] = {
333 PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null),
334 PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall),
335};
336
337static struct rpc_version nfs_cb_version4 = {
338 .number = 1,
339 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
340 .procs = nfs4_cb_procedures
341};
342
343static struct rpc_version * nfs_cb_version[] = {
344 NULL,
345 &nfs_cb_version4,
346};
347
348static struct rpc_program cb_program;
349
350static struct rpc_stat cb_stats = {
351 .program = &cb_program
352};
353
354#define NFS4_CALLBACK 0x40000000
355static struct rpc_program cb_program = {
356 .name = "nfs4_cb",
357 .number = NFS4_CALLBACK,
358 .nrvers = ARRAY_SIZE(nfs_cb_version),
359 .version = nfs_cb_version,
360 .stats = &cb_stats,
361};
362
363
364
365
366static int do_probe_callback(void *data)
367{
368 struct nfs4_client *clp = data;
369 struct sockaddr_in addr;
370 struct nfs4_callback *cb = &clp->cl_callback;
371 struct rpc_timeout timeparms = {
372 .to_initval = (NFSD_LEASE_TIME/4) * HZ,
373 .to_retries = 5,
374 .to_maxval = (NFSD_LEASE_TIME/2) * HZ,
375 .to_exponential = 1,
376 };
377 struct rpc_create_args args = {
378 .protocol = IPPROTO_TCP,
379 .address = (struct sockaddr *)&addr,
380 .addrsize = sizeof(addr),
381 .timeout = &timeparms,
382 .program = &cb_program,
383 .prognumber = cb->cb_prog,
384 .version = nfs_cb_version[1]->number,
385 .authflavor = RPC_AUTH_UNIX,
386 .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
387 };
388 struct rpc_message msg = {
389 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
390 .rpc_argp = clp,
391 };
392 struct rpc_clnt *client;
393 int status;
394
395
396 memset(&addr, 0, sizeof(addr));
397 addr.sin_family = AF_INET;
398 addr.sin_port = htons(cb->cb_port);
399 addr.sin_addr.s_addr = htonl(cb->cb_addr);
400
401
402 client = rpc_create(&args);
403 if (IS_ERR(client)) {
404 dprintk("NFSD: couldn't create callback client\n");
405 status = PTR_ERR(client);
406 goto out_err;
407 }
408
409 status = rpc_call_sync(client, &msg, RPC_TASK_SOFT);
410
411 if (status)
412 goto out_release_client;
413
414 cb->cb_client = client;
415 atomic_set(&cb->cb_set, 1);
416 put_nfs4_client(clp);
417 return 0;
418out_release_client:
419 rpc_shutdown_client(client);
420out_err:
421 dprintk("NFSD: warning: no callback path to client %.*s\n",
422 (int)clp->cl_name.len, clp->cl_name.data);
423 put_nfs4_client(clp);
424 return status;
425}
426
427
428
429
430void
431nfsd4_probe_callback(struct nfs4_client *clp)
432{
433 struct task_struct *t;
434
435 BUG_ON(atomic_read(&clp->cl_callback.cb_set));
436
437
438 atomic_inc(&clp->cl_count);
439
440 t = kthread_run(do_probe_callback, clp, "nfs4_cb_probe");
441
442 if (IS_ERR(t))
443 atomic_dec(&clp->cl_count);
444
445 return;
446}
447
448
449
450
451
452void
453nfsd4_cb_recall(struct nfs4_delegation *dp)
454{
455 struct nfs4_client *clp = dp->dl_client;
456 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
457 struct nfs4_cb_recall *cbr = &dp->dl_recall;
458 struct rpc_message msg = {
459 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
460 .rpc_argp = cbr,
461 };
462 int retries = 1;
463 int status = 0;
464
465 cbr->cbr_trunc = 0;
466 cbr->cbr_dp = dp;
467
468 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
469 while (retries--) {
470 switch (status) {
471 case -EIO:
472
473 atomic_set(&clp->cl_callback.cb_set, 0);
474 case -EBADHANDLE:
475 case -NFS4ERR_BAD_STATEID:
476
477
478 break;
479 default:
480 goto out_put_cred;
481 }
482 ssleep(2);
483 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
484 }
485out_put_cred:
486
487
488
489
490 put_nfs4_client(clp);
491 nfs4_put_delegation(dp);
492 return;
493}
494
