Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/lockd/mon.c | |
3 | * | |
4 | * The kernel statd client. | |
5 | * | |
6 | * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | #include <linux/types.h> | |
10 | #include <linux/utsname.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/sunrpc/clnt.h> | |
0896a725 | 13 | #include <linux/sunrpc/xprtsock.h> |
1da177e4 LT |
14 | #include <linux/sunrpc/svc.h> |
15 | #include <linux/lockd/lockd.h> | |
16 | #include <linux/lockd/sm_inter.h> | |
17 | ||
18 | ||
19 | #define NLMDBG_FACILITY NLMDBG_MONITOR | |
20 | ||
49695174 CL |
21 | #define XDR_ADDRBUF_LEN (20) |
22 | ||
1da177e4 LT |
23 | static struct rpc_clnt * nsm_create(void); |
24 | ||
25 | static struct rpc_program nsm_program; | |
26 | ||
27 | /* | |
28 | * Local NSM state | |
29 | */ | |
460f5cac | 30 | int nsm_local_state; |
1da177e4 LT |
31 | |
32 | /* | |
33 | * Common procedure for SM_MON/SM_UNMON calls | |
34 | */ | |
35 | static int | |
9502c522 | 36 | nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res) |
1da177e4 LT |
37 | { |
38 | struct rpc_clnt *clnt; | |
39 | int status; | |
40 | struct nsm_args args; | |
dead28da CL |
41 | struct rpc_message msg = { |
42 | .rpc_argp = &args, | |
43 | .rpc_resp = res, | |
44 | }; | |
1da177e4 LT |
45 | |
46 | clnt = nsm_create(); | |
47 | if (IS_ERR(clnt)) { | |
48 | status = PTR_ERR(clnt); | |
49 | goto out; | |
50 | } | |
51 | ||
9502c522 | 52 | memset(&args, 0, sizeof(args)); |
abd1f500 | 53 | args.mon_name = nsm->sm_name; |
9502c522 | 54 | args.addr = nsm->sm_addr.sin_addr.s_addr; |
1da177e4 | 55 | args.prog = NLM_PROGRAM; |
9502c522 | 56 | args.vers = 3; |
1da177e4 LT |
57 | args.proc = NLMPROC_NSM_NOTIFY; |
58 | memset(res, 0, sizeof(*res)); | |
59 | ||
dead28da CL |
60 | msg.rpc_proc = &clnt->cl_procinfo[proc]; |
61 | status = rpc_call_sync(clnt, &msg, 0); | |
1da177e4 LT |
62 | if (status < 0) |
63 | printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n", | |
64 | status); | |
65 | else | |
66 | status = 0; | |
90c5755f | 67 | rpc_shutdown_client(clnt); |
1da177e4 LT |
68 | out: |
69 | return status; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Set up monitoring of a remote host | |
74 | */ | |
75 | int | |
76 | nsm_monitor(struct nlm_host *host) | |
77 | { | |
8dead0db | 78 | struct nsm_handle *nsm = host->h_nsmhandle; |
1da177e4 LT |
79 | struct nsm_res res; |
80 | int status; | |
81 | ||
82 | dprintk("lockd: nsm_monitor(%s)\n", host->h_name); | |
8dead0db OK |
83 | BUG_ON(nsm == NULL); |
84 | ||
85 | if (nsm->sm_monitored) | |
977faf39 | 86 | return 0; |
1da177e4 | 87 | |
9502c522 | 88 | status = nsm_mon_unmon(nsm, SM_MON, &res); |
1da177e4 LT |
89 | |
90 | if (status < 0 || res.status != 0) | |
91 | printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name); | |
92 | else | |
8dead0db | 93 | nsm->sm_monitored = 1; |
1da177e4 LT |
94 | return status; |
95 | } | |
96 | ||
97 | /* | |
98 | * Cease to monitor remote host | |
99 | */ | |
100 | int | |
101 | nsm_unmonitor(struct nlm_host *host) | |
102 | { | |
8dead0db | 103 | struct nsm_handle *nsm = host->h_nsmhandle; |
1da177e4 | 104 | struct nsm_res res; |
977faf39 | 105 | int status = 0; |
1da177e4 | 106 | |
8dead0db | 107 | if (nsm == NULL) |
977faf39 | 108 | return 0; |
8dead0db | 109 | host->h_nsmhandle = NULL; |
977faf39 | 110 | |
9502c522 OK |
111 | if (atomic_read(&nsm->sm_count) == 1 |
112 | && nsm->sm_monitored && !nsm->sm_sticky) { | |
113 | dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name); | |
114 | ||
115 | status = nsm_mon_unmon(nsm, SM_UNMON, &res); | |
977faf39 | 116 | if (status < 0) |
9502c522 OK |
117 | printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", |
118 | host->h_name); | |
119 | else | |
120 | nsm->sm_monitored = 0; | |
977faf39 | 121 | } |
8dead0db | 122 | nsm_release(nsm); |
1da177e4 LT |
123 | return status; |
124 | } | |
125 | ||
126 | /* | |
127 | * Create NSM client for the local host | |
128 | */ | |
129 | static struct rpc_clnt * | |
130 | nsm_create(void) | |
131 | { | |
e1ec7892 CL |
132 | struct sockaddr_in sin = { |
133 | .sin_family = AF_INET, | |
134 | .sin_addr.s_addr = htonl(INADDR_LOOPBACK), | |
135 | .sin_port = 0, | |
136 | }; | |
137 | struct rpc_create_args args = { | |
0896a725 | 138 | .protocol = XPRT_TRANSPORT_UDP, |
e1ec7892 CL |
139 | .address = (struct sockaddr *)&sin, |
140 | .addrsize = sizeof(sin), | |
141 | .servername = "localhost", | |
142 | .program = &nsm_program, | |
143 | .version = SM_VERSION, | |
144 | .authflavor = RPC_AUTH_NULL, | |
e1ec7892 CL |
145 | }; |
146 | ||
147 | return rpc_create(&args); | |
1da177e4 LT |
148 | } |
149 | ||
150 | /* | |
151 | * XDR functions for NSM. | |
152 | */ | |
153 | ||
099bd05f CL |
154 | static __be32 *xdr_encode_nsm_string(__be32 *p, char *string) |
155 | { | |
156 | size_t len = strlen(string); | |
157 | ||
158 | if (len > SM_MAXSTRLEN) | |
159 | len = SM_MAXSTRLEN; | |
160 | return xdr_encode_opaque(p, string, len); | |
161 | } | |
162 | ||
49695174 CL |
163 | /* |
164 | * "mon_name" specifies the host to be monitored. | |
165 | * | |
166 | * Linux uses a text version of the IP address of the remote | |
167 | * host as the host identifier (the "mon_name" argument). | |
168 | * | |
169 | * Linux statd always looks up the canonical hostname first for | |
170 | * whatever remote hostname it receives, so this works alright. | |
171 | */ | |
172 | static __be32 *xdr_encode_mon_name(__be32 *p, struct nsm_args *argp) | |
173 | { | |
174 | char buffer[XDR_ADDRBUF_LEN + 1]; | |
175 | char *name = argp->mon_name; | |
176 | ||
177 | if (!nsm_use_hostnames) { | |
178 | snprintf(buffer, XDR_ADDRBUF_LEN, | |
179 | NIPQUAD_FMT, NIPQUAD(argp->addr)); | |
180 | name = buffer; | |
181 | } | |
182 | ||
183 | return xdr_encode_nsm_string(p, name); | |
184 | } | |
185 | ||
52921e02 AV |
186 | static __be32 * |
187 | xdr_encode_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp) | |
1da177e4 | 188 | { |
abd1f500 | 189 | char buffer[20], *name; |
1da177e4 LT |
190 | |
191 | /* | |
192 | * Use the dotted-quad IP address of the remote host as | |
193 | * identifier. Linux statd always looks up the canonical | |
194 | * hostname first for whatever remote hostname it receives, | |
195 | * so this works alright. | |
196 | */ | |
abd1f500 OK |
197 | if (nsm_use_hostnames) { |
198 | name = argp->mon_name; | |
199 | } else { | |
200 | sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); | |
201 | name = buffer; | |
202 | } | |
203 | if (!(p = xdr_encode_string(p, name)) | |
e9ff3990 | 204 | || !(p = xdr_encode_string(p, utsname()->nodename))) |
1da177e4 LT |
205 | return ERR_PTR(-EIO); |
206 | *p++ = htonl(argp->prog); | |
207 | *p++ = htonl(argp->vers); | |
208 | *p++ = htonl(argp->proc); | |
209 | ||
210 | return p; | |
211 | } | |
212 | ||
213 | static int | |
52921e02 | 214 | xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp) |
1da177e4 LT |
215 | { |
216 | p = xdr_encode_common(rqstp, p, argp); | |
217 | if (IS_ERR(p)) | |
218 | return PTR_ERR(p); | |
9502c522 OK |
219 | |
220 | /* Surprise - there may even be room for an IPv6 address now */ | |
1da177e4 | 221 | *p++ = argp->addr; |
9502c522 OK |
222 | *p++ = 0; |
223 | *p++ = 0; | |
1da177e4 LT |
224 | *p++ = 0; |
225 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static int | |
52921e02 | 230 | xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp) |
1da177e4 LT |
231 | { |
232 | p = xdr_encode_common(rqstp, p, argp); | |
233 | if (IS_ERR(p)) | |
234 | return PTR_ERR(p); | |
235 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static int | |
52921e02 | 240 | xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp) |
1da177e4 LT |
241 | { |
242 | resp->status = ntohl(*p++); | |
243 | resp->state = ntohl(*p++); | |
244 | dprintk("nsm: xdr_decode_stat_res status %d state %d\n", | |
245 | resp->status, resp->state); | |
246 | return 0; | |
247 | } | |
248 | ||
249 | static int | |
52921e02 | 250 | xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp) |
1da177e4 LT |
251 | { |
252 | resp->state = ntohl(*p++); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN)) | |
257 | #define SM_my_id_sz (3+1+SM_my_name_sz) | |
258 | #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz) | |
259 | #define SM_mon_sz (SM_mon_id_sz+4) | |
260 | #define SM_monres_sz 2 | |
261 | #define SM_unmonres_sz 1 | |
262 | ||
1da177e4 LT |
263 | static struct rpc_procinfo nsm_procedures[] = { |
264 | [SM_MON] = { | |
265 | .p_proc = SM_MON, | |
266 | .p_encode = (kxdrproc_t) xdr_encode_mon, | |
267 | .p_decode = (kxdrproc_t) xdr_decode_stat_res, | |
2bea90d4 CL |
268 | .p_arglen = SM_mon_sz, |
269 | .p_replen = SM_monres_sz, | |
cc0175c1 CL |
270 | .p_statidx = SM_MON, |
271 | .p_name = "MONITOR", | |
1da177e4 LT |
272 | }, |
273 | [SM_UNMON] = { | |
274 | .p_proc = SM_UNMON, | |
275 | .p_encode = (kxdrproc_t) xdr_encode_unmon, | |
276 | .p_decode = (kxdrproc_t) xdr_decode_stat, | |
2bea90d4 CL |
277 | .p_arglen = SM_mon_id_sz, |
278 | .p_replen = SM_unmonres_sz, | |
cc0175c1 CL |
279 | .p_statidx = SM_UNMON, |
280 | .p_name = "UNMONITOR", | |
1da177e4 LT |
281 | }, |
282 | }; | |
283 | ||
284 | static struct rpc_version nsm_version1 = { | |
e8c96f8c TK |
285 | .number = 1, |
286 | .nrprocs = ARRAY_SIZE(nsm_procedures), | |
1da177e4 LT |
287 | .procs = nsm_procedures |
288 | }; | |
289 | ||
290 | static struct rpc_version * nsm_version[] = { | |
291 | [1] = &nsm_version1, | |
292 | }; | |
293 | ||
294 | static struct rpc_stat nsm_stats; | |
295 | ||
296 | static struct rpc_program nsm_program = { | |
297 | .name = "statd", | |
298 | .number = SM_PROGRAM, | |
e8c96f8c | 299 | .nrvers = ARRAY_SIZE(nsm_version), |
1da177e4 LT |
300 | .version = nsm_version, |
301 | .stats = &nsm_stats | |
302 | }; |