J. Bruce Fields:
> On Mon, Aug 22, 2011 at 03:32:13PM -0400, Chuck Lever wrote:
>> On Aug 22, 2011, at 3:26 PM, J. Bruce Fields wrote:
>>
>>> On Sat, Aug 20, 2011 at 06:24:29PM +0800, Mi Jinlong wrote:
>>>> +/*
>>>> + * Add scope id for LINKLOCAL address
>>>> + */
>>>> +struct in6_addr_scopeid{
>>>> + struct in6_addr sin6_addr;
>>>> + __u32 sin6_scope_id;
>>>> +};
>>>> +
>>>> union svc_addr_u {
>>>> - struct in_addr addr;
>>>> - struct in6_addr addr6;
>>>> + struct in_addr addr;
>>>> + struct in6_addr_scopeid addr6;
>>> By the way, is there any reason why nfsd really needs its own address
>>> structure? Shouldn't we use sockaddr_storage or something? I feel like
>>> we've got a little too much one-off address handling in nfsd.
>> That would be my only complaint about the patch.
>>
>> I think we chose a smaller struct here to save space, and we could do that because we didn't need a port number or scope ID. If a scope ID is indeed required, then we should consider something larger like a struct sockaddr_storage, IMO.
>
> If we care about the size of struct svc_rqst: rq_vec and rq_pages fields
> are 4k and 2k, respectively, and the rest is lost in the noise.
>
> Mi Jinlong, would you have the time to try this?
>
> - Replace svc_addr_u by sockaddr_storage
> - See of that allows us to delete some lines of code in nfsd by
> using standard helper functions instead of copying things by
> hand.
>
> You'd do that in one patch, then apply your scope-id fix on top of it as
> a second patch.
After replace svc_addr_u by sockaddr_storage, the scope-id fix isn't needed.
thanks,
Mi Jinlong
>From 86bb57f2d7c29124ae73bd121bb6b97a72fe6f4d Mon Sep 17 00:00:00 2001
From: Mi Jinlong <mijinlong@xxxxxxxxxxxxxx>
Date: Mon, 24 Aug 2011 13:22:39 +0800
Subject: [PATCH] SUNRPC: Replace svc_addr_u by sockaddr_storage
For IPv6 local address, lockd can not callback to client for
missing scope id when binding address at inet6_bind:
324 if (addr_type & IPV6_ADDR_LINKLOCAL) {
325 if (addr_len >= sizeof(struct sockaddr_in6) &&
326 addr->sin6_scope_id) {
327 /* Override any existing binding, if another one
328 * is supplied by user.
329 */
330 sk->sk_bound_dev_if = addr->sin6_scope_id;
331 }
332
333 /* Binding to link-local address requires an interface */
334 if (!sk->sk_bound_dev_if) {
335 err = -EINVAL;
336 goto out_unlock;
337 }
Replacing svc_addr_u by sockaddr_storage, let rqstp->rq_daddr contains more info
besides address.
Signed-off-by: Mi Jinlong <mijinlong@xxxxxxxxxxxxxx>
---
fs/lockd/host.c | 14 ++------------
fs/nfsd/nfs4state.c | 16 +---------------
include/linux/sunrpc/svc.h | 30 +++++++++++++++++++++---------
net/sunrpc/svc_xprt.c | 13 ++-----------
net/sunrpc/svcsock.c | 9 +++++----
5 files changed, 31 insertions(+), 51 deletions(-)
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index b7c99bf..b23db05 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -316,14 +316,8 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
struct hlist_node *pos;
struct nlm_host *host = NULL;
struct nsm_handle *nsm = NULL;
- struct sockaddr_in sin = {
- .sin_family = AF_INET,
- };
- struct sockaddr_in6 sin6 = {
- .sin6_family = AF_INET6,
- };
struct sockaddr *src_sap;
- size_t src_len = rqstp->rq_addrlen;
+ size_t src_len = rqstp->rq_daddrlen;
struct nlm_lookup_host_info ni = {
.server = 1,
.sap = svc_addr(rqstp),
@@ -342,12 +336,8 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
switch (ni.sap->sa_family) {
case AF_INET:
- sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr;
- src_sap = (struct sockaddr *)&sin;
- break;
case AF_INET6:
- ipv6_addr_copy(&sin6.sin6_addr, &rqstp->rq_daddr.addr6);
- src_sap = (struct sockaddr *)&sin6;
+ src_sap = svc_daddr(rqstp);
break;
default:
dprintk("lockd: %s failed; unrecognized address family\n",
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 3787ec1..07a18a5 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1173,20 +1173,6 @@ find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
return NULL;
}
-static void rpc_svcaddr2sockaddr(struct sockaddr *sa, unsigned short family, union svc_addr_u *svcaddr)
-{
- switch (family) {
- case AF_INET:
- ((struct sockaddr_in *)sa)->sin_family = AF_INET;
- ((struct sockaddr_in *)sa)->sin_addr = svcaddr->addr;
- return;
- case AF_INET6:
- ((struct sockaddr_in6 *)sa)->sin6_family = AF_INET6;
- ((struct sockaddr_in6 *)sa)->sin6_addr = svcaddr->addr6;
- return;
- }
-}
-
static void
gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
{
@@ -1218,7 +1204,7 @@ gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_r
conn->cb_prog = se->se_callback_prog;
conn->cb_ident = se->se_callback_ident;
- rpc_svcaddr2sockaddr((struct sockaddr *)&conn->cb_saddr, expected_family, &rqstp->rq_daddr);
+ memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
return;
out_err:
conn->cb_addr.ss_family = AF_UNSPEC;
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 223588a..3bc0dc9 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -212,11 +212,6 @@ static inline void svc_putu32(struct kvec *iov, __be32 val)
iov->iov_len += sizeof(__be32);
}
-union svc_addr_u {
- struct in_addr addr;
- struct in6_addr addr6;
-};
-
/*
* The context of a single thread, including the request currently being
* processed.
@@ -225,8 +220,12 @@ struct svc_rqst {
struct list_head rq_list; /* idle list */
struct list_head rq_all; /* all threads list */
struct svc_xprt * rq_xprt; /* transport ptr */
+
struct sockaddr_storage rq_addr; /* peer address */
size_t rq_addrlen;
+ struct sockaddr_storage rq_daddr; /* dest addr of request
+ * - reply from here */
+ size_t rq_daddrlen;
struct svc_serv * rq_server; /* RPC service definition */
struct svc_pool * rq_pool; /* thread pool */
@@ -255,9 +254,6 @@ struct svc_rqst {
unsigned short
rq_secure : 1; /* secure port */
- union svc_addr_u rq_daddr; /* dest addr of request
- * - reply from here */
-
void * rq_argp; /* decoded arguments */
void * rq_resp; /* xdr'd results */
void * rq_auth_data; /* flavor-specific data */
@@ -300,6 +296,21 @@ static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst)
return (struct sockaddr *) &rqst->rq_addr;
}
+static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst)
+{
+ return (struct sockaddr_in *) &rqst->rq_daddr;
+}
+
+static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst)
+{
+ return (struct sockaddr_in6 *) &rqst->rq_daddr;
+}
+
+static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst)
+{
+ return (struct sockaddr *) &rqst->rq_daddr;
+}
+
/*
* Check buffer bounds after decoding arguments
*/
@@ -340,7 +351,8 @@ struct svc_deferred_req {
struct svc_xprt *xprt;
struct sockaddr_storage addr; /* where reply must go */
size_t addrlen;
- union svc_addr_u daddr; /* where reply must come from */
+ struct sockaddr_storage daddr; /* where reply must come from */
+ size_t daddrlen;
struct cache_deferred_req handle;
size_t xprt_hlen;
int argslen;
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index bd31208..d86bb67 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -254,8 +254,6 @@ EXPORT_SYMBOL_GPL(svc_create_xprt);
*/
void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt)
{
- struct sockaddr *sin;
-
memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen);
rqstp->rq_addrlen = xprt->xpt_remotelen;
@@ -263,15 +261,8 @@ void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt)
* Destination address in request is needed for binding the
* source address in RPC replies/callbacks later.
*/
- sin = (struct sockaddr *)&xprt->xpt_local;
- switch (sin->sa_family) {
- case AF_INET:
- rqstp->rq_daddr.addr = ((struct sockaddr_in *)sin)->sin_addr;
- break;
- case AF_INET6:
- rqstp->rq_daddr.addr6 = ((struct sockaddr_in6 *)sin)->sin6_addr;
- break;
- }
+ memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen);
+ rqstp->rq_daddrlen = xprt->xpt_locallen;
}
EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs);
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 767d494..b9f4ad4 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -143,7 +143,8 @@ static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
cmh->cmsg_level = SOL_IP;
cmh->cmsg_type = IP_PKTINFO;
pki->ipi_ifindex = 0;
- pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
+ pki->ipi_spec_dst.s_addr =
+ svc_daddr_in(rqstp)->sin_addr.s_addr;
cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
}
break;
@@ -155,7 +156,7 @@ static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
cmh->cmsg_type = IPV6_PKTINFO;
pki->ipi6_ifindex = 0;
ipv6_addr_copy(&pki->ipi6_addr,
- &rqstp->rq_daddr.addr6);
+ &svc_daddr_in6(rqstp)->sin6_addr);
cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
}
break;
@@ -500,7 +501,7 @@ static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
struct in_pktinfo *pki = CMSG_DATA(cmh);
if (cmh->cmsg_type != IP_PKTINFO)
return 0;
- rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
+ svc_daddr_in(rqstp)->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
return 1;
}
@@ -513,7 +514,7 @@ static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
struct in6_pktinfo *pki = CMSG_DATA(cmh);
if (cmh->cmsg_type != IPV6_PKTINFO)
return 0;
- ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
+ ipv6_addr_copy(&svc_daddr_in6(rqstp)->sin6_addr, &pki->ipi6_addr);
return 1;
}
--
1.7.6
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
