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