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-rw-r--r--fs/lockd/host.c350
1 files changed, 257 insertions, 93 deletions
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index a17664c7eac..9fd8889097b 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -11,16 +11,17 @@
#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)
@@ -30,42 +31,115 @@ static unsigned long next_gc;
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);
+static struct nsm_handle *nsm_find(const struct sockaddr *sap,
+ const size_t salen,
+ const char *hostname,
+ const size_t hostname_len,
+ const int create);
+
+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 */
+};
+
+/*
+ * 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;
+ }
+}
+
+static void nlm_display_address(const struct sockaddr *sap,
+ char *buf, const size_t len)
+{
+ const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+ const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+
+ switch (sap->sa_family) {
+ case AF_UNSPEC:
+ snprintf(buf, len, "unspecified");
+ break;
+ case AF_INET:
+ snprintf(buf, len, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
+ break;
+ case AF_INET6:
+ if (ipv6_addr_v4mapped(&sin6->sin6_addr))
+ snprintf(buf, len, NIPQUAD_FMT,
+ NIPQUAD(sin6->sin6_addr.s6_addr32[3]));
+ else
+ snprintf(buf, len, NIP6_FMT, NIP6(sin6->sin6_addr));
+ break;
+ default:
+ snprintf(buf, len, "unsupported address family");
+ 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))
@@ -78,22 +152,22 @@ static struct nlm_host *nlm_lookup_host(int server,
* 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 (!nlm_cmp_addr(nlm_srcaddr(host), ni->src_sap))
continue;
/* Move to head of hash chain. */
@@ -101,30 +175,41 @@ static struct nlm_host *nlm_lookup_host(int server,
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;
}
- if (nsm)
- atomic_inc(&nsm->sm_count);
-
- host = NULL;
- /* Sadly, the host isn't in our hash table yet. See if
- * we have an NSM handle for it. If not, create one.
+ /*
+ * The host wasn't in our hash table. If we don't
+ * have an NSM handle for it yet, create one.
*/
- if (!nsm && !(nsm = nsm_find(sin, hostname, hostname_len)))
- goto out;
+ if (nsm)
+ atomic_inc(&nsm->sm_count);
+ else {
+ host = NULL;
+ nsm = nsm_find(ni->sap, ni->salen,
+ ni->hostname, ni->hostname_len, 1);
+ 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;
+ 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;
@@ -135,7 +220,7 @@ static struct nlm_host *nlm_lookup_host(int server,
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;
hlist_add_head(&host->h_hash, chain);
INIT_LIST_HEAD(&host->h_lockowners);
spin_lock_init(&host->h_lock);
@@ -143,6 +228,15 @@ static struct nlm_host *nlm_lookup_host(int server,
INIT_LIST_HEAD(&host->h_reclaim);
nrhosts++;
+
+ nlm_display_address((struct sockaddr *)&host->h_addr,
+ host->h_addrbuf, sizeof(host->h_addrbuf));
+ nlm_display_address((struct sockaddr *)&host->h_srcaddr,
+ host->h_srcaddrbuf, sizeof(host->h_srcaddrbuf));
+
+ dprintk("lockd: nlm_lookup_host created host %s\n",
+ host->h_name);
+
out:
mutex_unlock(&nlm_host_mutex);
return host;
@@ -170,33 +264,103 @@ nlm_destroy_host(struct nlm_host *host)
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
+ *
+ * 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,
- const char *hostname,
- unsigned int hostname_len)
+struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
+ const size_t salen,
+ const unsigned short protocol,
+ const u32 version, const char *hostname)
{
- 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),
+ };
+
+ 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);
}
/*
@@ -207,9 +371,8 @@ nlm_bind_host(struct nlm_host *host)
{
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), my addr=%s\n",
+ host->h_name, host->h_addrbuf, host->h_srcaddrbuf);
/* Lock host handle */
mutex_lock(&host->h_mutex);
@@ -221,7 +384,7 @@ nlm_bind_host(struct nlm_host *host)
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 {
@@ -234,9 +397,9 @@ nlm_bind_host(struct nlm_host *host)
};
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,
@@ -324,12 +487,16 @@ void nlm_host_rebooted(const struct sockaddr_in *sin,
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_find((struct sockaddr *)sin, sizeof(*sin),
+ hostname, hostname_len, 0);
+ if (nsm == NULL) {
+ dprintk("lockd: never saw rebooted peer '%.*s' before\n",
+ hostname_len, hostname);
return;
+ }
+
+ dprintk("lockd: nlm_host_rebooted(%.*s, %s)\n",
+ hostname_len, hostname, nsm->sm_addrbuf);
/* When reclaiming locks on this peer, make sure that
* we set up a new notification */
@@ -461,22 +628,23 @@ nlm_gc_hosts(void)
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)
+static struct nsm_handle *nsm_find(const struct sockaddr *sap,
+ const size_t salen,
+ const char *hostname,
+ const size_t hostname_len,
+ const int create)
{
struct nsm_handle *nsm = NULL;
struct nsm_handle *pos;
- if (!sin)
+ if (!sap)
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);
+ (int)hostname_len, hostname);
}
return NULL;
}
@@ -489,7 +657,7 @@ retry:
if (strlen(pos->sm_name) != hostname_len
|| memcmp(pos->sm_name, hostname, hostname_len))
continue;
- } else if (!nlm_cmp_addr(&pos->sm_addr, sin))
+ } else if (!nlm_cmp_addr(nsm_addr(pos), sap))
continue;
atomic_inc(&pos->sm_count);
kfree(nsm);
@@ -509,10 +677,13 @@ retry:
if (nsm == NULL)
return NULL;
- nsm->sm_addr = *sin;
+ memcpy(nsm_addr(nsm), sap, salen);
+ nsm->sm_addrlen = salen;
nsm->sm_name = (char *) (nsm + 1);
memcpy(nsm->sm_name, hostname, hostname_len);
nsm->sm_name[hostname_len] = '\0';
+ nlm_display_address((struct sockaddr *)&nsm->sm_addr,
+ nsm->sm_addrbuf, sizeof(nsm->sm_addrbuf));
atomic_set(&nsm->sm_count, 1);
goto retry;
@@ -521,13 +692,6 @@ found:
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
*/
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-11 11:47:32 +0000