525 lines
12 KiB
C
525 lines
12 KiB
C
/*
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* linux/fs/lockd/mon.c
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*
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* The kernel statd client.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/utsname.h>
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#include <linux/kernel.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/xprtsock.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/lockd/lockd.h>
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#include <linux/lockd/sm_inter.h>
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#define NLMDBG_FACILITY NLMDBG_MONITOR
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#define NSM_PROGRAM 100024
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#define NSM_VERSION 1
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enum {
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NSMPROC_NULL,
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NSMPROC_STAT,
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NSMPROC_MON,
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NSMPROC_UNMON,
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NSMPROC_UNMON_ALL,
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NSMPROC_SIMU_CRASH,
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NSMPROC_NOTIFY,
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};
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struct nsm_args {
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struct nsm_private *priv;
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u32 prog; /* RPC callback info */
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u32 vers;
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u32 proc;
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char *mon_name;
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};
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struct nsm_res {
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u32 status;
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u32 state;
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};
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static struct rpc_clnt * nsm_create(void);
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static struct rpc_program nsm_program;
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static LIST_HEAD(nsm_handles);
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static DEFINE_SPINLOCK(nsm_lock);
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/*
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* Local NSM state
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*/
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int nsm_local_state;
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static void nsm_display_ipv4_address(const struct sockaddr *sap, char *buf,
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const size_t len)
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{
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const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
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snprintf(buf, len, "%pI4", &sin->sin_addr.s_addr);
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}
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static void nsm_display_ipv6_address(const struct sockaddr *sap, char *buf,
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const size_t len)
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{
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const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
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if (ipv6_addr_v4mapped(&sin6->sin6_addr))
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snprintf(buf, len, "%pI4", &sin6->sin6_addr.s6_addr32[3]);
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else if (sin6->sin6_scope_id != 0)
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snprintf(buf, len, "%pI6%%%u", &sin6->sin6_addr,
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sin6->sin6_scope_id);
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else
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snprintf(buf, len, "%pI6", &sin6->sin6_addr);
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}
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static void nsm_display_address(const struct sockaddr *sap,
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char *buf, const size_t len)
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{
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switch (sap->sa_family) {
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case AF_INET:
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nsm_display_ipv4_address(sap, buf, len);
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break;
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case AF_INET6:
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nsm_display_ipv6_address(sap, buf, len);
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break;
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default:
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snprintf(buf, len, "unsupported address family");
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break;
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}
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}
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/*
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* Common procedure for NSMPROC_MON/NSMPROC_UNMON calls
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*/
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static int
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nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
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{
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struct rpc_clnt *clnt;
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int status;
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struct nsm_args args = {
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.priv = &nsm->sm_priv,
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.prog = NLM_PROGRAM,
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.vers = 3,
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.proc = NLMPROC_NSM_NOTIFY,
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.mon_name = nsm->sm_mon_name,
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};
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struct rpc_message msg = {
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.rpc_argp = &args,
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.rpc_resp = res,
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};
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clnt = nsm_create();
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if (IS_ERR(clnt)) {
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status = PTR_ERR(clnt);
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dprintk("lockd: failed to create NSM upcall transport, "
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"status=%d\n", status);
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goto out;
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}
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memset(res, 0, sizeof(*res));
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msg.rpc_proc = &clnt->cl_procinfo[proc];
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status = rpc_call_sync(clnt, &msg, 0);
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if (status < 0)
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dprintk("lockd: NSM upcall RPC failed, status=%d\n",
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status);
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else
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status = 0;
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rpc_shutdown_client(clnt);
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out:
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return status;
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}
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/**
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* nsm_monitor - Notify a peer in case we reboot
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* @host: pointer to nlm_host of peer to notify
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*
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* If this peer is not already monitored, this function sends an
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* upcall to the local rpc.statd to record the name/address of
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* the peer to notify in case we reboot.
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*
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* Returns zero if the peer is monitored by the local rpc.statd;
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* otherwise a negative errno value is returned.
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*/
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int nsm_monitor(const struct nlm_host *host)
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{
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struct nsm_handle *nsm = host->h_nsmhandle;
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struct nsm_res res;
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int status;
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dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
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if (nsm->sm_monitored)
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return 0;
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/*
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* Choose whether to record the caller_name or IP address of
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* this peer in the local rpc.statd's database.
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*/
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nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
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status = nsm_mon_unmon(nsm, NSMPROC_MON, &res);
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if (res.status != 0)
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status = -EIO;
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if (status < 0)
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printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
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else
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nsm->sm_monitored = 1;
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return status;
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}
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/**
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* nsm_unmonitor - Unregister peer notification
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* @host: pointer to nlm_host of peer to stop monitoring
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*
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* If this peer is monitored, this function sends an upcall to
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* tell the local rpc.statd not to send this peer a notification
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* when we reboot.
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*/
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void nsm_unmonitor(const struct nlm_host *host)
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{
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struct nsm_handle *nsm = host->h_nsmhandle;
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struct nsm_res res;
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int status;
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if (atomic_read(&nsm->sm_count) == 1
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&& nsm->sm_monitored && !nsm->sm_sticky) {
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dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
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status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res);
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if (res.status != 0)
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status = -EIO;
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if (status < 0)
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printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
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nsm->sm_name);
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else
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nsm->sm_monitored = 0;
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}
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}
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/*
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* Construct a unique cookie to match this nsm_handle to this monitored
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* host. It is passed to the local rpc.statd via NSMPROC_MON, and
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* returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
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* requests.
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*
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* Linux provides the raw IP address of the monitored host,
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* left in network byte order.
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*/
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static void nsm_init_private(struct nsm_handle *nsm)
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{
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__be32 *p = (__be32 *)&nsm->sm_priv.data;
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*p = nsm_addr_in(nsm)->sin_addr.s_addr;
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}
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/**
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* nsm_find - Find or create a cached nsm_handle
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* @sap: pointer to socket address of handle to find
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* @salen: length of socket address
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* @hostname: pointer to C string containing hostname to find
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* @hostname_len: length of C string
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* @create: one means create new handle if not found in cache
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*
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* Behavior is modulated by the global nsm_use_hostnames variable
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* and by the @create argument.
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*
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* Returns a cached nsm_handle after bumping its ref count, or if
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* @create is set, returns a fresh nsm_handle if a handle that
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* matches @sap and/or @hostname cannot be found in the handle cache.
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* Returns NULL if an error occurs.
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*/
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struct nsm_handle *nsm_find(const struct sockaddr *sap, const size_t salen,
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const char *hostname, const size_t hostname_len,
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const int create)
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{
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struct nsm_handle *nsm = NULL;
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struct nsm_handle *pos;
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if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
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if (printk_ratelimit()) {
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printk(KERN_WARNING "Invalid hostname \"%.*s\" "
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"in NFS lock request\n",
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(int)hostname_len, hostname);
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}
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return NULL;
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}
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retry:
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spin_lock(&nsm_lock);
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list_for_each_entry(pos, &nsm_handles, sm_link) {
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if (hostname && nsm_use_hostnames) {
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if (strlen(pos->sm_name) != hostname_len
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|| memcmp(pos->sm_name, hostname, hostname_len))
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continue;
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} else if (!nlm_cmp_addr(nsm_addr(pos), sap))
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continue;
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atomic_inc(&pos->sm_count);
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kfree(nsm);
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nsm = pos;
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dprintk("lockd: found nsm_handle for %s (%s), cnt %d\n",
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pos->sm_name, pos->sm_addrbuf,
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atomic_read(&pos->sm_count));
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goto found;
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}
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if (nsm) {
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list_add(&nsm->sm_link, &nsm_handles);
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dprintk("lockd: created nsm_handle for %s (%s)\n",
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nsm->sm_name, nsm->sm_addrbuf);
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goto found;
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}
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spin_unlock(&nsm_lock);
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if (!create)
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return NULL;
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nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL);
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if (nsm == NULL)
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return NULL;
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memcpy(nsm_addr(nsm), sap, salen);
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nsm->sm_addrlen = salen;
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nsm->sm_name = (char *) (nsm + 1);
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memcpy(nsm->sm_name, hostname, hostname_len);
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nsm->sm_name[hostname_len] = '\0';
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nsm_init_private(nsm);
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nsm_display_address((struct sockaddr *)&nsm->sm_addr,
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nsm->sm_addrbuf, sizeof(nsm->sm_addrbuf));
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atomic_set(&nsm->sm_count, 1);
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goto retry;
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found:
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spin_unlock(&nsm_lock);
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return nsm;
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}
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/**
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* nsm_release - Release an NSM handle
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* @nsm: pointer to handle to be released
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*
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*/
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void nsm_release(struct nsm_handle *nsm)
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{
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if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
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list_del(&nsm->sm_link);
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spin_unlock(&nsm_lock);
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dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
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nsm->sm_name, nsm->sm_addrbuf);
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kfree(nsm);
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}
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}
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/*
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* Create NSM client for the local host
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*/
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static struct rpc_clnt *
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nsm_create(void)
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{
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struct sockaddr_in sin = {
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.sin_family = AF_INET,
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.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
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.sin_port = 0,
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};
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struct rpc_create_args args = {
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.protocol = XPRT_TRANSPORT_UDP,
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.address = (struct sockaddr *)&sin,
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.addrsize = sizeof(sin),
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.servername = "localhost",
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.program = &nsm_program,
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.version = NSM_VERSION,
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.authflavor = RPC_AUTH_NULL,
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};
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return rpc_create(&args);
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}
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/*
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* XDR functions for NSM.
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*
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* See http://www.opengroup.org/ for details on the Network
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* Status Monitor wire protocol.
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*/
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static int encode_nsm_string(struct xdr_stream *xdr, const char *string)
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{
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const u32 len = strlen(string);
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__be32 *p;
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if (unlikely(len > SM_MAXSTRLEN))
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return -EIO;
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p = xdr_reserve_space(xdr, sizeof(u32) + len);
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if (unlikely(p == NULL))
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return -EIO;
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xdr_encode_opaque(p, string, len);
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return 0;
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}
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/*
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* "mon_name" specifies the host to be monitored.
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*/
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static int encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
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{
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return encode_nsm_string(xdr, argp->mon_name);
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}
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/*
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* The "my_id" argument specifies the hostname and RPC procedure
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* to be called when the status manager receives notification
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* (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
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* has changed.
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*/
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static int encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
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{
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int status;
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__be32 *p;
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status = encode_nsm_string(xdr, utsname()->nodename);
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if (unlikely(status != 0))
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return status;
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p = xdr_reserve_space(xdr, 3 * sizeof(u32));
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if (unlikely(p == NULL))
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return -EIO;
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*p++ = htonl(argp->prog);
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*p++ = htonl(argp->vers);
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*p++ = htonl(argp->proc);
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return 0;
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}
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/*
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* The "mon_id" argument specifies the non-private arguments
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* of an NSMPROC_MON or NSMPROC_UNMON call.
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*/
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static int encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
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{
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int status;
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status = encode_mon_name(xdr, argp);
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if (unlikely(status != 0))
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return status;
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return encode_my_id(xdr, argp);
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}
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/*
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* The "priv" argument may contain private information required
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* by the NSMPROC_MON call. This information will be supplied in the
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* NLMPROC_SM_NOTIFY call.
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*/
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static int encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
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if (unlikely(p == NULL))
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return -EIO;
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xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
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return 0;
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}
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static int xdr_enc_mon(struct rpc_rqst *req, __be32 *p,
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const struct nsm_args *argp)
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{
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struct xdr_stream xdr;
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int status;
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xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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status = encode_mon_id(&xdr, argp);
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if (unlikely(status))
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return status;
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return encode_priv(&xdr, argp);
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}
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static int xdr_enc_unmon(struct rpc_rqst *req, __be32 *p,
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const struct nsm_args *argp)
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{
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struct xdr_stream xdr;
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xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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return encode_mon_id(&xdr, argp);
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}
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static int xdr_dec_stat_res(struct rpc_rqst *rqstp, __be32 *p,
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struct nsm_res *resp)
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{
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struct xdr_stream xdr;
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xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
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p = xdr_inline_decode(&xdr, 2 * sizeof(u32));
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if (unlikely(p == NULL))
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return -EIO;
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resp->status = ntohl(*p++);
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resp->state = ntohl(*p);
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dprintk("lockd: xdr_dec_stat_res status %d state %d\n",
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resp->status, resp->state);
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return 0;
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}
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static int xdr_dec_stat(struct rpc_rqst *rqstp, __be32 *p,
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struct nsm_res *resp)
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{
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struct xdr_stream xdr;
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xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
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p = xdr_inline_decode(&xdr, sizeof(u32));
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if (unlikely(p == NULL))
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return -EIO;
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resp->state = ntohl(*p);
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dprintk("lockd: xdr_dec_stat state %d\n", resp->state);
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return 0;
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}
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#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
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#define SM_my_id_sz (SM_my_name_sz+3)
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#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
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#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
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#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
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#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
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#define SM_monres_sz 2
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#define SM_unmonres_sz 1
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static struct rpc_procinfo nsm_procedures[] = {
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[NSMPROC_MON] = {
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.p_proc = NSMPROC_MON,
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.p_encode = (kxdrproc_t)xdr_enc_mon,
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.p_decode = (kxdrproc_t)xdr_dec_stat_res,
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.p_arglen = SM_mon_sz,
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.p_replen = SM_monres_sz,
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.p_statidx = NSMPROC_MON,
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.p_name = "MONITOR",
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},
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[NSMPROC_UNMON] = {
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.p_proc = NSMPROC_UNMON,
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.p_encode = (kxdrproc_t)xdr_enc_unmon,
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.p_decode = (kxdrproc_t)xdr_dec_stat,
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.p_arglen = SM_mon_id_sz,
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.p_replen = SM_unmonres_sz,
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.p_statidx = NSMPROC_UNMON,
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.p_name = "UNMONITOR",
|
|
},
|
|
};
|
|
|
|
static struct rpc_version nsm_version1 = {
|
|
.number = 1,
|
|
.nrprocs = ARRAY_SIZE(nsm_procedures),
|
|
.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 = NSM_PROGRAM,
|
|
.nrvers = ARRAY_SIZE(nsm_version),
|
|
.version = nsm_version,
|
|
.stats = &nsm_stats
|
|
};
|