#include <linux/types.h>
#include <linux/slab.h>
#include <linux/in.h>
+#include <linux/in6.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/lockd/lockd.h>
-#include <linux/lockd/sm_inter.h>
#include <linux/mutex.h>
+#include <net/ipv6.h>
#define NLMDBG_FACILITY NLMDBG_HOSTCACHE
#define NLM_HOST_NRHASH 32
-#define NLM_ADDRHASH(addr) (ntohl(addr) & (NLM_HOST_NRHASH-1))
#define NLM_HOST_REBIND (60 * HZ)
#define NLM_HOST_EXPIRE (300 * HZ)
#define NLM_HOST_COLLECT (120 * HZ)
static int nrhosts;
static DEFINE_MUTEX(nlm_host_mutex);
-
static void nlm_gc_hosts(void);
-static struct nsm_handle * __nsm_find(const struct sockaddr_in *,
- const char *, unsigned int, int);
-static struct nsm_handle * nsm_find(const struct sockaddr_in *sin,
- const char *hostname,
- unsigned int hostname_len);
+
+struct nlm_lookup_host_info {
+ const int server; /* search for server|client */
+ const struct sockaddr *sap; /* address to search for */
+ const size_t salen; /* it's length */
+ const unsigned short protocol; /* transport to search for*/
+ const u32 version; /* NLM version to search for */
+ const char *hostname; /* remote's hostname */
+ const size_t hostname_len; /* it's length */
+ const struct sockaddr *src_sap; /* our address (optional) */
+ const size_t src_len; /* it's length */
+ const int noresvport; /* use non-priv port */
+};
+
+/*
+ * Hash function must work well on big- and little-endian platforms
+ */
+static unsigned int __nlm_hash32(const __be32 n)
+{
+ unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16);
+ return hash ^ (hash >> 8);
+}
+
+static unsigned int __nlm_hash_addr4(const struct sockaddr *sap)
+{
+ const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+ return __nlm_hash32(sin->sin_addr.s_addr);
+}
+
+static unsigned int __nlm_hash_addr6(const struct sockaddr *sap)
+{
+ const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+ const struct in6_addr addr = sin6->sin6_addr;
+ return __nlm_hash32(addr.s6_addr32[0]) ^
+ __nlm_hash32(addr.s6_addr32[1]) ^
+ __nlm_hash32(addr.s6_addr32[2]) ^
+ __nlm_hash32(addr.s6_addr32[3]);
+}
+
+static unsigned int nlm_hash_address(const struct sockaddr *sap)
+{
+ unsigned int hash;
+
+ switch (sap->sa_family) {
+ case AF_INET:
+ hash = __nlm_hash_addr4(sap);
+ break;
+ case AF_INET6:
+ hash = __nlm_hash_addr6(sap);
+ break;
+ default:
+ hash = 0;
+ }
+ return hash & (NLM_HOST_NRHASH - 1);
+}
+
+static void nlm_clear_port(struct sockaddr *sap)
+{
+ switch (sap->sa_family) {
+ case AF_INET:
+ ((struct sockaddr_in *)sap)->sin_port = 0;
+ break;
+ case AF_INET6:
+ ((struct sockaddr_in6 *)sap)->sin6_port = 0;
+ break;
+ }
+}
/*
* Common host lookup routine for server & client
*/
-static struct nlm_host *nlm_lookup_host(int server,
- const struct sockaddr_in *sin,
- int proto, u32 version,
- const char *hostname,
- unsigned int hostname_len,
- const struct sockaddr_in *ssin)
+static struct nlm_host *nlm_lookup_host(struct nlm_lookup_host_info *ni)
{
struct hlist_head *chain;
struct hlist_node *pos;
struct nlm_host *host;
struct nsm_handle *nsm = NULL;
- int hash;
-
- dprintk("lockd: nlm_lookup_host("NIPQUAD_FMT"->"NIPQUAD_FMT
- ", p=%d, v=%u, my role=%s, name=%.*s)\n",
- NIPQUAD(ssin->sin_addr.s_addr),
- NIPQUAD(sin->sin_addr.s_addr), proto, version,
- server? "server" : "client",
- hostname_len,
- hostname? hostname : "<none>");
-
- hash = NLM_ADDRHASH(sin->sin_addr.s_addr);
-
- /* Lock hash table */
mutex_lock(&nlm_host_mutex);
if (time_after_eq(jiffies, next_gc))
* different NLM rpc_clients into one single nlm_host object.
* This would allow us to have one nlm_host per address.
*/
- chain = &nlm_hosts[hash];
+ chain = &nlm_hosts[nlm_hash_address(ni->sap)];
hlist_for_each_entry(host, pos, chain, h_hash) {
- if (!nlm_cmp_addr(&host->h_addr, sin))
+ if (!nlm_cmp_addr(nlm_addr(host), ni->sap))
continue;
/* See if we have an NSM handle for this client */
if (!nsm)
nsm = host->h_nsmhandle;
- if (host->h_proto != proto)
+ if (host->h_proto != ni->protocol)
continue;
- if (host->h_version != version)
+ if (host->h_version != ni->version)
continue;
- if (host->h_server != server)
+ if (host->h_server != ni->server)
continue;
- if (!nlm_cmp_addr(&host->h_saddr, ssin))
+ if (ni->server &&
+ !nlm_cmp_addr(nlm_srcaddr(host), ni->src_sap))
continue;
/* Move to head of hash chain. */
hlist_add_head(&host->h_hash, chain);
nlm_get_host(host);
+ dprintk("lockd: nlm_lookup_host found host %s (%s)\n",
+ host->h_name, host->h_addrbuf);
goto out;
}
atomic_inc(&nsm->sm_count);
else {
host = NULL;
- nsm = nsm_find(sin, hostname, hostname_len);
- if (!nsm)
+ nsm = nsm_get_handle(ni->sap, ni->salen,
+ ni->hostname, ni->hostname_len);
+ if (!nsm) {
+ dprintk("lockd: nlm_lookup_host failed; "
+ "no nsm handle\n");
goto out;
+ }
}
host = kzalloc(sizeof(*host), GFP_KERNEL);
if (!host) {
nsm_release(nsm);
+ dprintk("lockd: nlm_lookup_host failed; no memory\n");
goto out;
}
host->h_name = nsm->sm_name;
- host->h_addr = *sin;
- host->h_addr.sin_port = 0; /* ouch! */
- host->h_saddr = *ssin;
- host->h_version = version;
- host->h_proto = proto;
+ host->h_addrbuf = nsm->sm_addrbuf;
+ memcpy(nlm_addr(host), ni->sap, ni->salen);
+ host->h_addrlen = ni->salen;
+ nlm_clear_port(nlm_addr(host));
+ memcpy(nlm_srcaddr(host), ni->src_sap, ni->src_len);
+ host->h_version = ni->version;
+ host->h_proto = ni->protocol;
host->h_rpcclnt = NULL;
mutex_init(&host->h_mutex);
host->h_nextrebind = jiffies + NLM_HOST_REBIND;
host->h_state = 0; /* pseudo NSM state */
host->h_nsmstate = 0; /* real NSM state */
host->h_nsmhandle = nsm;
- host->h_server = server;
+ host->h_server = ni->server;
+ host->h_noresvport = ni->noresvport;
hlist_add_head(&host->h_hash, chain);
INIT_LIST_HEAD(&host->h_lockowners);
spin_lock_init(&host->h_lock);
INIT_LIST_HEAD(&host->h_reclaim);
nrhosts++;
+
+ dprintk("lockd: nlm_lookup_host created host %s\n",
+ host->h_name);
+
out:
mutex_unlock(&nlm_host_mutex);
return host;
BUG_ON(!list_empty(&host->h_lockowners));
BUG_ON(atomic_read(&host->h_count));
- /*
- * Release NSM handle and unmonitor host.
- */
nsm_unmonitor(host);
+ nsm_release(host->h_nsmhandle);
clnt = host->h_rpcclnt;
if (clnt != NULL)
kfree(host);
}
-/*
- * Find an NLM server handle in the cache. If there is none, create it.
+/**
+ * nlmclnt_lookup_host - Find an NLM host handle matching a remote server
+ * @sap: network address of server
+ * @salen: length of server address
+ * @protocol: transport protocol to use
+ * @version: NLM protocol version
+ * @hostname: '\0'-terminated hostname of server
+ * @noresvport: 1 if non-privileged port should be used
+ *
+ * Returns an nlm_host structure that matches the passed-in
+ * [server address, transport protocol, NLM version, server hostname].
+ * If one doesn't already exist in the host cache, a new handle is
+ * created and returned.
*/
-struct nlm_host *nlmclnt_lookup_host(const struct sockaddr_in *sin,
- int proto, u32 version,
+struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
+ const size_t salen,
+ const unsigned short protocol,
+ const u32 version,
const char *hostname,
- unsigned int hostname_len)
+ int noresvport)
{
- struct sockaddr_in ssin = {0};
-
- return nlm_lookup_host(0, sin, proto, version,
- hostname, hostname_len, &ssin);
+ const struct sockaddr source = {
+ .sa_family = AF_UNSPEC,
+ };
+ struct nlm_lookup_host_info ni = {
+ .server = 0,
+ .sap = sap,
+ .salen = salen,
+ .protocol = protocol,
+ .version = version,
+ .hostname = hostname,
+ .hostname_len = strlen(hostname),
+ .src_sap = &source,
+ .src_len = sizeof(source),
+ .noresvport = noresvport,
+ };
+
+ dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__,
+ (hostname ? hostname : "<none>"), version,
+ (protocol == IPPROTO_UDP ? "udp" : "tcp"));
+
+ return nlm_lookup_host(&ni);
}
-/*
- * Find an NLM client handle in the cache. If there is none, create it.
+/**
+ * nlmsvc_lookup_host - Find an NLM host handle matching a remote client
+ * @rqstp: incoming NLM request
+ * @hostname: name of client host
+ * @hostname_len: length of client hostname
+ *
+ * Returns an nlm_host structure that matches the [client address,
+ * transport protocol, NLM version, client hostname] of the passed-in
+ * NLM request. If one doesn't already exist in the host cache, a
+ * new handle is created and returned.
+ *
+ * Before possibly creating a new nlm_host, construct a sockaddr
+ * for a specific source address in case the local system has
+ * multiple network addresses. The family of the address in
+ * rq_daddr is guaranteed to be the same as the family of the
+ * address in rq_addr, so it's safe to use the same family for
+ * the source address.
*/
-struct nlm_host *
-nlmsvc_lookup_host(struct svc_rqst *rqstp,
- const char *hostname, unsigned int hostname_len)
+struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
+ const char *hostname,
+ const size_t hostname_len)
{
- struct sockaddr_in ssin = {0};
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ };
+ struct sockaddr_in6 sin6 = {
+ .sin6_family = AF_INET6,
+ };
+ struct nlm_lookup_host_info ni = {
+ .server = 1,
+ .sap = svc_addr(rqstp),
+ .salen = rqstp->rq_addrlen,
+ .protocol = rqstp->rq_prot,
+ .version = rqstp->rq_vers,
+ .hostname = hostname,
+ .hostname_len = hostname_len,
+ .src_len = rqstp->rq_addrlen,
+ };
+
+ dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__,
+ (int)hostname_len, hostname, rqstp->rq_vers,
+ (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));
+
+ switch (ni.sap->sa_family) {
+ case AF_INET:
+ sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr;
+ ni.src_sap = (struct sockaddr *)&sin;
+ break;
+ case AF_INET6:
+ ipv6_addr_copy(&sin6.sin6_addr, &rqstp->rq_daddr.addr6);
+ ni.src_sap = (struct sockaddr *)&sin6;
+ break;
+ default:
+ return NULL;
+ }
- ssin.sin_addr = rqstp->rq_daddr.addr;
- return nlm_lookup_host(1, svc_addr_in(rqstp),
- rqstp->rq_prot, rqstp->rq_vers,
- hostname, hostname_len, &ssin);
+ return nlm_lookup_host(&ni);
}
/*
{
struct rpc_clnt *clnt;
- dprintk("lockd: nlm_bind_host("NIPQUAD_FMT"->"NIPQUAD_FMT")\n",
- NIPQUAD(host->h_saddr.sin_addr),
- NIPQUAD(host->h_addr.sin_addr));
+ dprintk("lockd: nlm_bind_host %s (%s)\n",
+ host->h_name, host->h_addrbuf);
/* Lock host handle */
mutex_lock(&host->h_mutex);
if (time_after_eq(jiffies, host->h_nextrebind)) {
rpc_force_rebind(clnt);
host->h_nextrebind = jiffies + NLM_HOST_REBIND;
- dprintk("lockd: next rebind in %ld jiffies\n",
+ dprintk("lockd: next rebind in %lu jiffies\n",
host->h_nextrebind - jiffies);
}
} else {
};
struct rpc_create_args args = {
.protocol = host->h_proto,
- .address = (struct sockaddr *)&host->h_addr,
- .addrsize = sizeof(host->h_addr),
- .saddress = (struct sockaddr *)&host->h_saddr,
+ .address = nlm_addr(host),
+ .addrsize = host->h_addrlen,
+ .saddress = nlm_srcaddr(host),
.timeout = &timeparms,
.servername = host->h_name,
.program = &nlm_program,
*/
if (!host->h_server)
args.flags |= RPC_CLNT_CREATE_HARDRTRY;
+ if (host->h_noresvport)
+ args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
clnt = rpc_create(&args);
if (!IS_ERR(clnt))
}
}
-/*
- * We were notified that the host indicated by address &sin
- * has rebooted.
- * Release all resources held by that peer.
+/**
+ * nlm_host_rebooted - Release all resources held by rebooted host
+ * @info: pointer to decoded results of NLM_SM_NOTIFY call
+ *
+ * We were notified that the specified host has rebooted. Release
+ * all resources held by that peer.
*/
-void nlm_host_rebooted(const struct sockaddr_in *sin,
- const char *hostname,
- unsigned int hostname_len,
- u32 new_state)
+void nlm_host_rebooted(const struct nlm_reboot *info)
{
struct hlist_head *chain;
struct hlist_node *pos;
struct nsm_handle *nsm;
struct nlm_host *host;
- dprintk("lockd: nlm_host_rebooted(%s, %u.%u.%u.%u)\n",
- hostname, NIPQUAD(sin->sin_addr));
-
- /* Find the NSM handle for this peer */
- if (!(nsm = __nsm_find(sin, hostname, hostname_len, 0)))
+ nsm = nsm_reboot_lookup(info);
+ if (unlikely(nsm == NULL))
return;
- /* When reclaiming locks on this peer, make sure that
- * we set up a new notification */
- nsm->sm_monitored = 0;
-
/* Mark all hosts tied to this NSM state as having rebooted.
* We run the loop repeatedly, because we drop the host table
* lock for this.
for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
hlist_for_each_entry(host, pos, chain, h_hash) {
if (host->h_nsmhandle == nsm
- && host->h_nsmstate != new_state) {
- host->h_nsmstate = new_state;
+ && host->h_nsmstate != info->state) {
+ host->h_nsmstate = info->state;
host->h_state++;
nlm_get_host(host);
next_gc = jiffies + NLM_HOST_COLLECT;
}
-
-
-/*
- * Manage NSM handles
- */
-static LIST_HEAD(nsm_handles);
-static DEFINE_SPINLOCK(nsm_lock);
-
-static struct nsm_handle *
-__nsm_find(const struct sockaddr_in *sin,
- const char *hostname, unsigned int hostname_len,
- int create)
-{
- struct nsm_handle *nsm = NULL;
- struct nsm_handle *pos;
-
- if (!sin)
- return NULL;
-
- if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
- if (printk_ratelimit()) {
- printk(KERN_WARNING "Invalid hostname \"%.*s\" "
- "in NFS lock request\n",
- hostname_len, hostname);
- }
- return NULL;
- }
-
-retry:
- spin_lock(&nsm_lock);
- list_for_each_entry(pos, &nsm_handles, sm_link) {
-
- if (hostname && nsm_use_hostnames) {
- if (strlen(pos->sm_name) != hostname_len
- || memcmp(pos->sm_name, hostname, hostname_len))
- continue;
- } else if (!nlm_cmp_addr(&pos->sm_addr, sin))
- continue;
- atomic_inc(&pos->sm_count);
- kfree(nsm);
- nsm = pos;
- goto found;
- }
- if (nsm) {
- list_add(&nsm->sm_link, &nsm_handles);
- goto found;
- }
- spin_unlock(&nsm_lock);
-
- if (!create)
- return NULL;
-
- nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL);
- if (nsm == NULL)
- return NULL;
-
- nsm->sm_addr = *sin;
- nsm->sm_name = (char *) (nsm + 1);
- memcpy(nsm->sm_name, hostname, hostname_len);
- nsm->sm_name[hostname_len] = '\0';
- atomic_set(&nsm->sm_count, 1);
- goto retry;
-
-found:
- spin_unlock(&nsm_lock);
- return nsm;
-}
-
-static struct nsm_handle *
-nsm_find(const struct sockaddr_in *sin, const char *hostname,
- unsigned int hostname_len)
-{
- return __nsm_find(sin, hostname, hostname_len, 1);
-}
-
-/*
- * Release an NSM handle
- */
-void
-nsm_release(struct nsm_handle *nsm)
-{
- if (!nsm)
- return;
- if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
- list_del(&nsm->sm_link);
- spin_unlock(&nsm_lock);
- kfree(nsm);
- }
-}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff