]>
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> | |
13 | #include <linux/sunrpc/svc.h> | |
14 | #include <linux/lockd/lockd.h> | |
15 | #include <linux/lockd/sm_inter.h> | |
16 | ||
17 | ||
18 | #define NLMDBG_FACILITY NLMDBG_MONITOR | |
19 | ||
20 | static struct rpc_clnt * nsm_create(void); | |
21 | ||
22 | static struct rpc_program nsm_program; | |
23 | ||
24 | /* | |
25 | * Local NSM state | |
26 | */ | |
27 | u32 nsm_local_state; | |
28 | ||
29 | /* | |
30 | * Common procedure for SM_MON/SM_UNMON calls | |
31 | */ | |
32 | static int | |
33 | nsm_mon_unmon(struct nlm_host *host, u32 proc, struct nsm_res *res) | |
34 | { | |
35 | struct rpc_clnt *clnt; | |
36 | int status; | |
37 | struct nsm_args args; | |
dead28da CL |
38 | struct rpc_message msg = { |
39 | .rpc_argp = &args, | |
40 | .rpc_resp = res, | |
41 | }; | |
1da177e4 LT |
42 | |
43 | clnt = nsm_create(); | |
44 | if (IS_ERR(clnt)) { | |
45 | status = PTR_ERR(clnt); | |
46 | goto out; | |
47 | } | |
48 | ||
49 | args.addr = host->h_addr.sin_addr.s_addr; | |
50 | args.proto= (host->h_proto<<1) | host->h_server; | |
51 | args.prog = NLM_PROGRAM; | |
52 | args.vers = host->h_version; | |
53 | args.proc = NLMPROC_NSM_NOTIFY; | |
54 | memset(res, 0, sizeof(*res)); | |
55 | ||
dead28da CL |
56 | msg.rpc_proc = &clnt->cl_procinfo[proc]; |
57 | status = rpc_call_sync(clnt, &msg, 0); | |
1da177e4 LT |
58 | if (status < 0) |
59 | printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n", | |
60 | status); | |
61 | else | |
62 | status = 0; | |
63 | out: | |
64 | return status; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Set up monitoring of a remote host | |
69 | */ | |
70 | int | |
71 | nsm_monitor(struct nlm_host *host) | |
72 | { | |
8dead0db | 73 | struct nsm_handle *nsm = host->h_nsmhandle; |
1da177e4 LT |
74 | struct nsm_res res; |
75 | int status; | |
76 | ||
77 | dprintk("lockd: nsm_monitor(%s)\n", host->h_name); | |
8dead0db OK |
78 | BUG_ON(nsm == NULL); |
79 | ||
80 | if (nsm->sm_monitored) | |
977faf39 | 81 | return 0; |
1da177e4 LT |
82 | |
83 | status = nsm_mon_unmon(host, SM_MON, &res); | |
84 | ||
85 | if (status < 0 || res.status != 0) | |
86 | printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name); | |
87 | else | |
8dead0db | 88 | nsm->sm_monitored = 1; |
1da177e4 LT |
89 | return status; |
90 | } | |
91 | ||
92 | /* | |
93 | * Cease to monitor remote host | |
94 | */ | |
95 | int | |
96 | nsm_unmonitor(struct nlm_host *host) | |
97 | { | |
8dead0db | 98 | struct nsm_handle *nsm = host->h_nsmhandle; |
1da177e4 | 99 | struct nsm_res res; |
977faf39 | 100 | int status = 0; |
1da177e4 LT |
101 | |
102 | dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name); | |
8dead0db | 103 | if (nsm == NULL) |
977faf39 | 104 | return 0; |
8dead0db | 105 | host->h_nsmhandle = NULL; |
977faf39 OK |
106 | |
107 | if (!host->h_killed) { | |
108 | status = nsm_mon_unmon(host, SM_UNMON, &res); | |
109 | if (status < 0) | |
110 | printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name); | |
8dead0db | 111 | nsm->sm_monitored = 0; |
977faf39 | 112 | } |
8dead0db | 113 | nsm_release(nsm); |
1da177e4 LT |
114 | return status; |
115 | } | |
116 | ||
117 | /* | |
118 | * Create NSM client for the local host | |
119 | */ | |
120 | static struct rpc_clnt * | |
121 | nsm_create(void) | |
122 | { | |
e1ec7892 CL |
123 | struct sockaddr_in sin = { |
124 | .sin_family = AF_INET, | |
125 | .sin_addr.s_addr = htonl(INADDR_LOOPBACK), | |
126 | .sin_port = 0, | |
127 | }; | |
128 | struct rpc_create_args args = { | |
129 | .protocol = IPPROTO_UDP, | |
130 | .address = (struct sockaddr *)&sin, | |
131 | .addrsize = sizeof(sin), | |
132 | .servername = "localhost", | |
133 | .program = &nsm_program, | |
134 | .version = SM_VERSION, | |
135 | .authflavor = RPC_AUTH_NULL, | |
136 | .flags = (RPC_CLNT_CREATE_ONESHOT), | |
137 | }; | |
138 | ||
139 | return rpc_create(&args); | |
1da177e4 LT |
140 | } |
141 | ||
142 | /* | |
143 | * XDR functions for NSM. | |
144 | */ | |
145 | ||
146 | static u32 * | |
147 | xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
148 | { | |
149 | char buffer[20]; | |
150 | ||
151 | /* | |
152 | * Use the dotted-quad IP address of the remote host as | |
153 | * identifier. Linux statd always looks up the canonical | |
154 | * hostname first for whatever remote hostname it receives, | |
155 | * so this works alright. | |
156 | */ | |
157 | sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); | |
158 | if (!(p = xdr_encode_string(p, buffer)) | |
e9ff3990 | 159 | || !(p = xdr_encode_string(p, utsname()->nodename))) |
1da177e4 LT |
160 | return ERR_PTR(-EIO); |
161 | *p++ = htonl(argp->prog); | |
162 | *p++ = htonl(argp->vers); | |
163 | *p++ = htonl(argp->proc); | |
164 | ||
165 | return p; | |
166 | } | |
167 | ||
168 | static int | |
169 | xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
170 | { | |
171 | p = xdr_encode_common(rqstp, p, argp); | |
172 | if (IS_ERR(p)) | |
173 | return PTR_ERR(p); | |
174 | *p++ = argp->addr; | |
175 | *p++ = argp->vers; | |
176 | *p++ = argp->proto; | |
177 | *p++ = 0; | |
178 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static int | |
183 | xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
184 | { | |
185 | p = xdr_encode_common(rqstp, p, argp); | |
186 | if (IS_ERR(p)) | |
187 | return PTR_ERR(p); | |
188 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static int | |
193 | xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) | |
194 | { | |
195 | resp->status = ntohl(*p++); | |
196 | resp->state = ntohl(*p++); | |
197 | dprintk("nsm: xdr_decode_stat_res status %d state %d\n", | |
198 | resp->status, resp->state); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static int | |
203 | xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) | |
204 | { | |
205 | resp->state = ntohl(*p++); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN)) | |
210 | #define SM_my_id_sz (3+1+SM_my_name_sz) | |
211 | #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz) | |
212 | #define SM_mon_sz (SM_mon_id_sz+4) | |
213 | #define SM_monres_sz 2 | |
214 | #define SM_unmonres_sz 1 | |
215 | ||
216 | #ifndef MAX | |
217 | # define MAX(a, b) (((a) > (b))? (a) : (b)) | |
218 | #endif | |
219 | ||
220 | static struct rpc_procinfo nsm_procedures[] = { | |
221 | [SM_MON] = { | |
222 | .p_proc = SM_MON, | |
223 | .p_encode = (kxdrproc_t) xdr_encode_mon, | |
224 | .p_decode = (kxdrproc_t) xdr_decode_stat_res, | |
225 | .p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2, | |
cc0175c1 CL |
226 | .p_statidx = SM_MON, |
227 | .p_name = "MONITOR", | |
1da177e4 LT |
228 | }, |
229 | [SM_UNMON] = { | |
230 | .p_proc = SM_UNMON, | |
231 | .p_encode = (kxdrproc_t) xdr_encode_unmon, | |
232 | .p_decode = (kxdrproc_t) xdr_decode_stat, | |
233 | .p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2, | |
cc0175c1 CL |
234 | .p_statidx = SM_UNMON, |
235 | .p_name = "UNMONITOR", | |
1da177e4 LT |
236 | }, |
237 | }; | |
238 | ||
239 | static struct rpc_version nsm_version1 = { | |
e8c96f8c TK |
240 | .number = 1, |
241 | .nrprocs = ARRAY_SIZE(nsm_procedures), | |
1da177e4 LT |
242 | .procs = nsm_procedures |
243 | }; | |
244 | ||
245 | static struct rpc_version * nsm_version[] = { | |
246 | [1] = &nsm_version1, | |
247 | }; | |
248 | ||
249 | static struct rpc_stat nsm_stats; | |
250 | ||
251 | static struct rpc_program nsm_program = { | |
252 | .name = "statd", | |
253 | .number = SM_PROGRAM, | |
e8c96f8c | 254 | .nrvers = ARRAY_SIZE(nsm_version), |
1da177e4 LT |
255 | .version = nsm_version, |
256 | .stats = &nsm_stats | |
257 | }; |