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 | { | |
e1ec7892 CL |
112 | struct sockaddr_in sin = { |
113 | .sin_family = AF_INET, | |
114 | .sin_addr.s_addr = htonl(INADDR_LOOPBACK), | |
115 | .sin_port = 0, | |
116 | }; | |
117 | struct rpc_create_args args = { | |
118 | .protocol = IPPROTO_UDP, | |
119 | .address = (struct sockaddr *)&sin, | |
120 | .addrsize = sizeof(sin), | |
121 | .servername = "localhost", | |
122 | .program = &nsm_program, | |
123 | .version = SM_VERSION, | |
124 | .authflavor = RPC_AUTH_NULL, | |
125 | .flags = (RPC_CLNT_CREATE_ONESHOT), | |
126 | }; | |
127 | ||
128 | return rpc_create(&args); | |
1da177e4 LT |
129 | } |
130 | ||
131 | /* | |
132 | * XDR functions for NSM. | |
133 | */ | |
134 | ||
135 | static u32 * | |
136 | xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
137 | { | |
138 | char buffer[20]; | |
139 | ||
140 | /* | |
141 | * Use the dotted-quad IP address of the remote host as | |
142 | * identifier. Linux statd always looks up the canonical | |
143 | * hostname first for whatever remote hostname it receives, | |
144 | * so this works alright. | |
145 | */ | |
146 | sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); | |
147 | if (!(p = xdr_encode_string(p, buffer)) | |
148 | || !(p = xdr_encode_string(p, system_utsname.nodename))) | |
149 | return ERR_PTR(-EIO); | |
150 | *p++ = htonl(argp->prog); | |
151 | *p++ = htonl(argp->vers); | |
152 | *p++ = htonl(argp->proc); | |
153 | ||
154 | return p; | |
155 | } | |
156 | ||
157 | static int | |
158 | xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
159 | { | |
160 | p = xdr_encode_common(rqstp, p, argp); | |
161 | if (IS_ERR(p)) | |
162 | return PTR_ERR(p); | |
163 | *p++ = argp->addr; | |
164 | *p++ = argp->vers; | |
165 | *p++ = argp->proto; | |
166 | *p++ = 0; | |
167 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | static int | |
172 | xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
173 | { | |
174 | p = xdr_encode_common(rqstp, p, argp); | |
175 | if (IS_ERR(p)) | |
176 | return PTR_ERR(p); | |
177 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int | |
182 | xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) | |
183 | { | |
184 | resp->status = ntohl(*p++); | |
185 | resp->state = ntohl(*p++); | |
186 | dprintk("nsm: xdr_decode_stat_res status %d state %d\n", | |
187 | resp->status, resp->state); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int | |
192 | xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) | |
193 | { | |
194 | resp->state = ntohl(*p++); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN)) | |
199 | #define SM_my_id_sz (3+1+SM_my_name_sz) | |
200 | #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz) | |
201 | #define SM_mon_sz (SM_mon_id_sz+4) | |
202 | #define SM_monres_sz 2 | |
203 | #define SM_unmonres_sz 1 | |
204 | ||
205 | #ifndef MAX | |
206 | # define MAX(a, b) (((a) > (b))? (a) : (b)) | |
207 | #endif | |
208 | ||
209 | static struct rpc_procinfo nsm_procedures[] = { | |
210 | [SM_MON] = { | |
211 | .p_proc = SM_MON, | |
212 | .p_encode = (kxdrproc_t) xdr_encode_mon, | |
213 | .p_decode = (kxdrproc_t) xdr_decode_stat_res, | |
214 | .p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2, | |
cc0175c1 CL |
215 | .p_statidx = SM_MON, |
216 | .p_name = "MONITOR", | |
1da177e4 LT |
217 | }, |
218 | [SM_UNMON] = { | |
219 | .p_proc = SM_UNMON, | |
220 | .p_encode = (kxdrproc_t) xdr_encode_unmon, | |
221 | .p_decode = (kxdrproc_t) xdr_decode_stat, | |
222 | .p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2, | |
cc0175c1 CL |
223 | .p_statidx = SM_UNMON, |
224 | .p_name = "UNMONITOR", | |
1da177e4 LT |
225 | }, |
226 | }; | |
227 | ||
228 | static struct rpc_version nsm_version1 = { | |
e8c96f8c TK |
229 | .number = 1, |
230 | .nrprocs = ARRAY_SIZE(nsm_procedures), | |
1da177e4 LT |
231 | .procs = nsm_procedures |
232 | }; | |
233 | ||
234 | static struct rpc_version * nsm_version[] = { | |
235 | [1] = &nsm_version1, | |
236 | }; | |
237 | ||
238 | static struct rpc_stat nsm_stats; | |
239 | ||
240 | static struct rpc_program nsm_program = { | |
241 | .name = "statd", | |
242 | .number = SM_PROGRAM, | |
e8c96f8c | 243 | .nrvers = ARRAY_SIZE(nsm_version), |
1da177e4 LT |
244 | .version = nsm_version, |
245 | .stats = &nsm_stats | |
246 | }; |