Re: [PATCH] sunrpc: Add scope id to svc_addr_u for IPv6 LINKLOCAL address

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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


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