/* * linux/fs/lockd/mon.c * * The kernel statd client. * * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> */ #include <linux/types.h> #include <linux/utsname.h> #include <linux/kernel.h> #include <linux/sunrpc/clnt.h> #include <linux/sunrpc/svc.h> #include <linux/lockd/lockd.h> #include <linux/lockd/sm_inter.h> #define NLMDBG_FACILITY NLMDBG_MONITOR static struct rpc_clnt * nsm_create(void); static struct rpc_program nsm_program; /* * Local NSM state */ u32 nsm_local_state; /* * Common procedure for SM_MON/SM_UNMON calls */ static int nsm_mon_unmon(struct nlm_host *host, u32 proc, struct nsm_res *res) { struct rpc_clnt *clnt; int status; struct nsm_args args; clnt = nsm_create(); if (IS_ERR(clnt)) { status = PTR_ERR(clnt); goto out; } args.addr = host->h_addr.sin_addr.s_addr; args.proto= (host->h_proto<<1) | host->h_server; args.prog = NLM_PROGRAM; args.vers = host->h_version; args.proc = NLMPROC_NSM_NOTIFY; memset(res, 0, sizeof(*res)); status = rpc_call(clnt, proc, &args, res, 0); if (status < 0) printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n", status); else status = 0; out: return status; } /* * Set up monitoring of a remote host */ int nsm_monitor(struct nlm_host *host) { struct nsm_res res; int status; dprintk("lockd: nsm_monitor(%s)\n", host->h_name); status = nsm_mon_unmon(host, SM_MON, &res); if (status < 0 || res.status != 0) printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name); else host->h_monitored = 1; return status; } /* * Cease to monitor remote host */ int nsm_unmonitor(struct nlm_host *host) { struct nsm_res res; int status; dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name); status = nsm_mon_unmon(host, SM_UNMON, &res); if (status < 0) printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name); else host->h_monitored = 0; return status; } /* * Create NSM client for the local host */ static struct rpc_clnt * nsm_create(void) { struct rpc_xprt *xprt; struct rpc_clnt *clnt; struct sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); sin.sin_port = 0; xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL); if (IS_ERR(xprt)) return (struct rpc_clnt *)xprt; xprt->resvport = 1; /* NSM requires a reserved port */ clnt = rpc_create_client(xprt, "localhost", &nsm_program, SM_VERSION, RPC_AUTH_NULL); if (IS_ERR(clnt)) goto out_err; clnt->cl_softrtry = 1; clnt->cl_chatty = 1; clnt->cl_oneshot = 1; return clnt; out_err: return clnt; } /* * XDR functions for NSM. */ static u32 * xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) { char buffer[20]; /* * Use the dotted-quad IP address of the remote host as * identifier. Linux statd always looks up the canonical * hostname first for whatever remote hostname it receives, * so this works alright. */ sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); if (!(p = xdr_encode_string(p, buffer)) || !(p = xdr_encode_string(p, system_utsname.nodename))) return ERR_PTR(-EIO); *p++ = htonl(argp->prog); *p++ = htonl(argp->vers); *p++ = htonl(argp->proc); return p; } static int xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) { p = xdr_encode_common(rqstp, p, argp); if (IS_ERR(p)) return PTR_ERR(p); *p++ = argp->addr; *p++ = argp->vers; *p++ = argp->proto; *p++ = 0; rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); return 0; } static int xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) { p = xdr_encode_common(rqstp, p, argp); if (IS_ERR(p)) return PTR_ERR(p); rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); return 0; } static int xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) { resp->status = ntohl(*p++); resp->state = ntohl(*p++); dprintk("nsm: xdr_decode_stat_res status %d state %d\n", resp->status, resp->state); return 0; } static int xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp) { resp->state = ntohl(*p++); return 0; } #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN)) #define SM_my_id_sz (3+1+SM_my_name_sz) #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz) #define SM_mon_sz (SM_mon_id_sz+4) #define SM_monres_sz 2 #define SM_unmonres_sz 1 #ifndef MAX # define MAX(a, b) (((a) > (b))? (a) : (b)) #endif static struct rpc_procinfo nsm_procedures[] = { [SM_MON] = { .p_proc = SM_MON, .p_encode = (kxdrproc_t) xdr_encode_mon, .p_decode = (kxdrproc_t) xdr_decode_stat_res, .p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2, }, [SM_UNMON] = { .p_proc = SM_UNMON, .p_encode = (kxdrproc_t) xdr_encode_unmon, .p_decode = (kxdrproc_t) xdr_decode_stat, .p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2, }, }; static struct rpc_version nsm_version1 = { .number = 1, .nrprocs = sizeof(nsm_procedures)/sizeof(nsm_procedures[0]), .procs = nsm_procedures }; static struct rpc_version * nsm_version[] = { [1] = &nsm_version1, }; static struct rpc_stat nsm_stats; static struct rpc_program nsm_program = { .name = "statd", .number = SM_PROGRAM, .nrvers = sizeof(nsm_version)/sizeof(nsm_version[0]), .version = nsm_version, .stats = &nsm_stats };