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nfsd: fix IPv6 address handling in the DRC

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Currently, it only stores the first 16 bytes of any address. struct
sockaddr_in6 is 28 bytes however, so we're currently ignoring the last
12 bytes of the address.

Expand the c_addr field to a sockaddr_in6, and cast it to a sockaddr_in
as necessary. Also fix the comparitor to use the existing RPC
helpers for this.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2013-01-28 14:41:07 -05:00 committed by J. Bruce Fields
parent 885c91f746
commit 7b9e8522a6
3 changed files with 13 additions and 4 deletions
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6
fs/nfsd/cache.h
View File

@ -12,6 +12,10 @@
/*
* Representation of a reply cache entry.
*
* Note that we use a sockaddr_in6 to hold the address instead of the more
* typical sockaddr_storage. This is for space reasons, since sockaddr_storage
* is much larger than a sockaddr_in6.
*/
struct svc_cacherep {
struct hlist_node c_hash;
@ -20,7 +24,7 @@ struct svc_cacherep {
unsigned char c_state, /* unused, inprog, done */
c_type, /* status, buffer */
c_secure : 1; /* req came from port < 1024 */
struct sockaddr_in c_addr;
struct sockaddr_in6 c_addr;
__be32 c_xid;
u32 c_prot;
u32 c_proc;

7
fs/nfsd/nfscache.c
View File

@ -9,6 +9,7 @@
*/
#include <linux/slab.h>
#include <linux/sunrpc/clnt.h>
#include "nfsd.h"
#include "cache.h"
@ -146,7 +147,8 @@ nfsd_cache_lookup(struct svc_rqst *rqstp)
xid == rp->c_xid && proc == rp->c_proc &&
proto == rp->c_prot && vers == rp->c_vers &&
time_before(jiffies, rp->c_timestamp + 120*HZ) &&
memcmp((char*)&rqstp->rq_addr, (char*)&rp->c_addr, sizeof(rp->c_addr))==0) {
rpc_cmp_addr(svc_addr(rqstp), (struct sockaddr *)&rp->c_addr) &&
rpc_get_port(svc_addr(rqstp)) == rpc_get_port((struct sockaddr *)&rp->c_addr)) {
nfsdstats.rchits++;
goto found_entry;
}
@ -183,7 +185,8 @@ nfsd_cache_lookup(struct svc_rqst *rqstp)
rp->c_state = RC_INPROG;
rp->c_xid = xid;
rp->c_proc = proc;
memcpy(&rp->c_addr, svc_addr_in(rqstp), sizeof(rp->c_addr));
rpc_copy_addr((struct sockaddr *)&rp->c_addr, svc_addr(rqstp));
rpc_set_port((struct sockaddr *)&rp->c_addr, rpc_get_port(svc_addr(rqstp)));
rp->c_prot = proto;
rp->c_vers = vers;
rp->c_timestamp = jiffies;

4
include/linux/sunrpc/clnt.h
View File

@ -263,7 +263,9 @@ static inline bool __rpc_copy_addr6(struct sockaddr *dst,
* @sap1: first sockaddr
* @sap2: second sockaddr
*
* Just compares the family and address portion. Ignores port, scope, etc.
* Just compares the family and address portion. Ignores port, but
* compares the scope if it's a link-local address.
*
* Returns true if the addrs are equal, false if they aren't.
*/
static inline bool rpc_cmp_addr(const struct sockaddr *sap1,