Commit | Line | Data |
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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 | { | |
73 | struct nsm_res res; | |
74 | int status; | |
75 | ||
76 | dprintk("lockd: nsm_monitor(%s)\n", host->h_name); | |
77 | ||
78 | status = nsm_mon_unmon(host, SM_MON, &res); | |
79 | ||
80 | if (status < 0 || res.status != 0) | |
81 | printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name); | |
82 | else | |
83 | host->h_monitored = 1; | |
84 | return status; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Cease to monitor remote host | |
89 | */ | |
90 | int | |
91 | nsm_unmonitor(struct nlm_host *host) | |
92 | { | |
93 | struct nsm_res res; | |
94 | int status; | |
95 | ||
96 | dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name); | |
97 | ||
98 | status = nsm_mon_unmon(host, SM_UNMON, &res); | |
99 | if (status < 0) | |
100 | printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name); | |
101 | else | |
102 | host->h_monitored = 0; | |
103 | return status; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Create NSM client for the local host | |
108 | */ | |
109 | static struct rpc_clnt * | |
110 | nsm_create(void) | |
111 | { | |
112 | struct rpc_xprt *xprt; | |
113 | struct rpc_clnt *clnt; | |
114 | struct sockaddr_in sin; | |
115 | ||
116 | sin.sin_family = AF_INET; | |
117 | sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
118 | sin.sin_port = 0; | |
119 | ||
120 | xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL); | |
121 | if (IS_ERR(xprt)) | |
122 | return (struct rpc_clnt *)xprt; | |
5ee0ed7d | 123 | xprt->resvport = 1; /* NSM requires a reserved port */ |
1da177e4 LT |
124 | |
125 | clnt = rpc_create_client(xprt, "localhost", | |
126 | &nsm_program, SM_VERSION, | |
127 | RPC_AUTH_NULL); | |
128 | if (IS_ERR(clnt)) | |
5b616f5d | 129 | goto out_err; |
1da177e4 | 130 | clnt->cl_softrtry = 1; |
1da177e4 | 131 | clnt->cl_oneshot = 1; |
1da177e4 LT |
132 | return clnt; |
133 | ||
5b616f5d | 134 | out_err: |
1da177e4 LT |
135 | return clnt; |
136 | } | |
137 | ||
138 | /* | |
139 | * XDR functions for NSM. | |
140 | */ | |
141 | ||
142 | static u32 * | |
143 | xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
144 | { | |
145 | char buffer[20]; | |
146 | ||
147 | /* | |
148 | * Use the dotted-quad IP address of the remote host as | |
149 | * identifier. Linux statd always looks up the canonical | |
150 | * hostname first for whatever remote hostname it receives, | |
151 | * so this works alright. | |
152 | */ | |
153 | sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); | |
154 | if (!(p = xdr_encode_string(p, buffer)) | |
155 | || !(p = xdr_encode_string(p, system_utsname.nodename))) | |
156 | return ERR_PTR(-EIO); | |
157 | *p++ = htonl(argp->prog); | |
158 | *p++ = htonl(argp->vers); | |
159 | *p++ = htonl(argp->proc); | |
160 | ||
161 | return p; | |
162 | } | |
163 | ||
164 | static int | |
165 | xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
166 | { | |
167 | p = xdr_encode_common(rqstp, p, argp); | |
168 | if (IS_ERR(p)) | |
169 | return PTR_ERR(p); | |
170 | *p++ = argp->addr; | |
171 | *p++ = argp->vers; | |
172 | *p++ = argp->proto; | |
173 | *p++ = 0; | |
174 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int | |
179 | xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
180 | { | |
181 | p = xdr_encode_common(rqstp, p, argp); | |
182 | if (IS_ERR(p)) | |
183 | return PTR_ERR(p); | |
184 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static int | |
189 | xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) | |
190 | { | |
191 | resp->status = ntohl(*p++); | |
192 | resp->state = ntohl(*p++); | |
193 | dprintk("nsm: xdr_decode_stat_res status %d state %d\n", | |
194 | resp->status, resp->state); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static int | |
199 | xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) | |
200 | { | |
201 | resp->state = ntohl(*p++); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN)) | |
206 | #define SM_my_id_sz (3+1+SM_my_name_sz) | |
207 | #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz) | |
208 | #define SM_mon_sz (SM_mon_id_sz+4) | |
209 | #define SM_monres_sz 2 | |
210 | #define SM_unmonres_sz 1 | |
211 | ||
212 | #ifndef MAX | |
213 | # define MAX(a, b) (((a) > (b))? (a) : (b)) | |
214 | #endif | |
215 | ||
216 | static struct rpc_procinfo nsm_procedures[] = { | |
217 | [SM_MON] = { | |
218 | .p_proc = SM_MON, | |
219 | .p_encode = (kxdrproc_t) xdr_encode_mon, | |
220 | .p_decode = (kxdrproc_t) xdr_decode_stat_res, | |
221 | .p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2, | |
cc0175c1 CL |
222 | .p_statidx = SM_MON, |
223 | .p_name = "MONITOR", | |
1da177e4 LT |
224 | }, |
225 | [SM_UNMON] = { | |
226 | .p_proc = SM_UNMON, | |
227 | .p_encode = (kxdrproc_t) xdr_encode_unmon, | |
228 | .p_decode = (kxdrproc_t) xdr_decode_stat, | |
229 | .p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2, | |
cc0175c1 CL |
230 | .p_statidx = SM_UNMON, |
231 | .p_name = "UNMONITOR", | |
1da177e4 LT |
232 | }, |
233 | }; | |
234 | ||
235 | static struct rpc_version nsm_version1 = { | |
e8c96f8c TK |
236 | .number = 1, |
237 | .nrprocs = ARRAY_SIZE(nsm_procedures), | |
1da177e4 LT |
238 | .procs = nsm_procedures |
239 | }; | |
240 | ||
241 | static struct rpc_version * nsm_version[] = { | |
242 | [1] = &nsm_version1, | |
243 | }; | |
244 | ||
245 | static struct rpc_stat nsm_stats; | |
246 | ||
247 | static struct rpc_program nsm_program = { | |
248 | .name = "statd", | |
249 | .number = SM_PROGRAM, | |
e8c96f8c | 250 | .nrvers = ARRAY_SIZE(nsm_version), |
1da177e4 LT |
251 | .version = nsm_version, |
252 | .stats = &nsm_stats | |
253 | }; |