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; | |
38 | ||
39 | clnt = nsm_create(); | |
40 | if (IS_ERR(clnt)) { | |
41 | status = PTR_ERR(clnt); | |
42 | goto out; | |
43 | } | |
44 | ||
45 | args.addr = host->h_addr.sin_addr.s_addr; | |
46 | args.proto= (host->h_proto<<1) | host->h_server; | |
47 | args.prog = NLM_PROGRAM; | |
48 | args.vers = host->h_version; | |
49 | args.proc = NLMPROC_NSM_NOTIFY; | |
50 | memset(res, 0, sizeof(*res)); | |
51 | ||
52 | status = rpc_call(clnt, proc, &args, res, 0); | |
53 | if (status < 0) | |
54 | printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n", | |
55 | status); | |
56 | else | |
57 | status = 0; | |
58 | out: | |
59 | return status; | |
60 | } | |
61 | ||
62 | /* | |
63 | * Set up monitoring of a remote host | |
64 | */ | |
65 | int | |
66 | nsm_monitor(struct nlm_host *host) | |
67 | { | |
68 | struct nsm_res res; | |
69 | int status; | |
70 | ||
71 | dprintk("lockd: nsm_monitor(%s)\n", host->h_name); | |
72 | ||
73 | status = nsm_mon_unmon(host, SM_MON, &res); | |
74 | ||
75 | if (status < 0 || res.status != 0) | |
76 | printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name); | |
77 | else | |
78 | host->h_monitored = 1; | |
79 | return status; | |
80 | } | |
81 | ||
82 | /* | |
83 | * Cease to monitor remote host | |
84 | */ | |
85 | int | |
86 | nsm_unmonitor(struct nlm_host *host) | |
87 | { | |
88 | struct nsm_res res; | |
89 | int status; | |
90 | ||
91 | dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name); | |
92 | ||
93 | status = nsm_mon_unmon(host, SM_UNMON, &res); | |
94 | if (status < 0) | |
95 | printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name); | |
96 | else | |
97 | host->h_monitored = 0; | |
98 | return status; | |
99 | } | |
100 | ||
101 | /* | |
102 | * Create NSM client for the local host | |
103 | */ | |
104 | static struct rpc_clnt * | |
105 | nsm_create(void) | |
106 | { | |
107 | struct rpc_xprt *xprt; | |
108 | struct rpc_clnt *clnt; | |
109 | struct sockaddr_in sin; | |
110 | ||
111 | sin.sin_family = AF_INET; | |
112 | sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
113 | sin.sin_port = 0; | |
114 | ||
115 | xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL); | |
116 | if (IS_ERR(xprt)) | |
117 | return (struct rpc_clnt *)xprt; | |
5ee0ed7d | 118 | xprt->resvport = 1; /* NSM requires a reserved port */ |
1da177e4 LT |
119 | |
120 | clnt = rpc_create_client(xprt, "localhost", | |
121 | &nsm_program, SM_VERSION, | |
122 | RPC_AUTH_NULL); | |
123 | if (IS_ERR(clnt)) | |
5b616f5d | 124 | goto out_err; |
1da177e4 | 125 | clnt->cl_softrtry = 1; |
1da177e4 | 126 | clnt->cl_oneshot = 1; |
1da177e4 LT |
127 | return clnt; |
128 | ||
5b616f5d | 129 | out_err: |
1da177e4 LT |
130 | return clnt; |
131 | } | |
132 | ||
133 | /* | |
134 | * XDR functions for NSM. | |
135 | */ | |
136 | ||
137 | static u32 * | |
138 | xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
139 | { | |
140 | char buffer[20]; | |
141 | ||
142 | /* | |
143 | * Use the dotted-quad IP address of the remote host as | |
144 | * identifier. Linux statd always looks up the canonical | |
145 | * hostname first for whatever remote hostname it receives, | |
146 | * so this works alright. | |
147 | */ | |
148 | sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); | |
149 | if (!(p = xdr_encode_string(p, buffer)) | |
150 | || !(p = xdr_encode_string(p, system_utsname.nodename))) | |
151 | return ERR_PTR(-EIO); | |
152 | *p++ = htonl(argp->prog); | |
153 | *p++ = htonl(argp->vers); | |
154 | *p++ = htonl(argp->proc); | |
155 | ||
156 | return p; | |
157 | } | |
158 | ||
159 | static int | |
160 | xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
161 | { | |
162 | p = xdr_encode_common(rqstp, p, argp); | |
163 | if (IS_ERR(p)) | |
164 | return PTR_ERR(p); | |
165 | *p++ = argp->addr; | |
166 | *p++ = argp->vers; | |
167 | *p++ = argp->proto; | |
168 | *p++ = 0; | |
169 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int | |
174 | xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) | |
175 | { | |
176 | p = xdr_encode_common(rqstp, p, argp); | |
177 | if (IS_ERR(p)) | |
178 | return PTR_ERR(p); | |
179 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static int | |
184 | xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) | |
185 | { | |
186 | resp->status = ntohl(*p++); | |
187 | resp->state = ntohl(*p++); | |
188 | dprintk("nsm: xdr_decode_stat_res status %d state %d\n", | |
189 | resp->status, resp->state); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int | |
194 | xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) | |
195 | { | |
196 | resp->state = ntohl(*p++); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN)) | |
201 | #define SM_my_id_sz (3+1+SM_my_name_sz) | |
202 | #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz) | |
203 | #define SM_mon_sz (SM_mon_id_sz+4) | |
204 | #define SM_monres_sz 2 | |
205 | #define SM_unmonres_sz 1 | |
206 | ||
207 | #ifndef MAX | |
208 | # define MAX(a, b) (((a) > (b))? (a) : (b)) | |
209 | #endif | |
210 | ||
211 | static struct rpc_procinfo nsm_procedures[] = { | |
212 | [SM_MON] = { | |
213 | .p_proc = SM_MON, | |
214 | .p_encode = (kxdrproc_t) xdr_encode_mon, | |
215 | .p_decode = (kxdrproc_t) xdr_decode_stat_res, | |
216 | .p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2, | |
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, | |
223 | }, | |
224 | }; | |
225 | ||
226 | static struct rpc_version nsm_version1 = { | |
227 | .number = 1, | |
228 | .nrprocs = sizeof(nsm_procedures)/sizeof(nsm_procedures[0]), | |
229 | .procs = nsm_procedures | |
230 | }; | |
231 | ||
232 | static struct rpc_version * nsm_version[] = { | |
233 | [1] = &nsm_version1, | |
234 | }; | |
235 | ||
236 | static struct rpc_stat nsm_stats; | |
237 | ||
238 | static struct rpc_program nsm_program = { | |
239 | .name = "statd", | |
240 | .number = SM_PROGRAM, | |
241 | .nrvers = sizeof(nsm_version)/sizeof(nsm_version[0]), | |
242 | .version = nsm_version, | |
243 | .stats = &nsm_stats | |
244 | }; |