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

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Thanks for you comment!

Chuck Lever:
> On Aug 25, 2011, at 10:30 AM, Chuck Lever wrote:
> 
>> This seems like a good direction to go in.  More comments below.
>>
>> On Aug 24, 2011, at 1:58 AM, Mi Jinlong wrote:
>>
>>> 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",
>> With the destination address promoted to a full sockaddr, we probably do not need this switch any more.

  Got it.

>>
>> I notice that the IPv6 fork of rpc_cmp_addr() does not consider the scope IDs of the passed-in addresses.  Perhaps it should?

  Have add scope ID compare at __rpc_cmp_addr6 as following patch.

>>
>>> 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;
>>> }   
  ... snip ...
>>> 		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);
>> I kind of suspect more is needed here to deal with ipi6_ifindex.

  Got it.

>>
>>> 			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);
>> Likewise, is the incoming interface index ignored when constructing svc_daddr_in6(rqstp) ?
> 
> Also, I can't seem to find where the address family field of svc_daddr() is being set.
> 

  Have complete it.

thanks,
Mi Jinlong


>From 84420475509ccc39ac8899f6f63140879a5278b6 Mon Sep 17 00:00:00 2001
From: Mi Jinlong <mijinlong@xxxxxxxxxxxxxx>
Date: Mon, 26 Aug 2011 13:22:39 +0800
Subject: [PATCH v2] 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             |   25 ++-----------------------
 fs/nfsd/nfs4state.c         |   16 +---------------
 include/linux/sunrpc/clnt.h |    3 ++-
 include/linux/sunrpc/svc.h  |   30 +++++++++++++++++++++---------
 net/sunrpc/svc_xprt.c       |   13 ++-----------
 net/sunrpc/svcsock.c        |   23 +++++++++++++++++------
 6 files changed, 45 insertions(+), 65 deletions(-)

diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index b7c99bf..6f29836 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;
+	struct sockaddr *src_sap = svc_daddr(rqstp);
+	size_t src_len = rqstp->rq_daddrlen;
 	struct nlm_lookup_host_info ni = {
 		.server		= 1,
 		.sap		= svc_addr(rqstp),
@@ -340,21 +334,6 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
 
 	mutex_lock(&nlm_host_mutex);
 
-	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;
-		break;
-	default:
-		dprintk("lockd: %s failed; unrecognized address family\n",
-			__func__);
-		goto out;
-	}
-
 	if (time_after_eq(jiffies, next_gc))
 		nlm_gc_hosts();
 
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/clnt.h b/include/linux/sunrpc/clnt.h
index db7bcaf..1529a80 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -218,7 +218,8 @@ static inline bool __rpc_cmp_addr6(const struct sockaddr *sap1,
 {
 	const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sap1;
 	const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sap2;
-	return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr);
+	return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)
+		&& (sin1->sin6_scope_id == sin2->sin6_scope_id);
 }
 
 static inline bool __rpc_copy_addr6(struct sockaddr *dst,
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..dfd686e 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -143,19 +143,20 @@ 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;
 
 	case AF_INET6: {
 			struct in6_pktinfo *pki = CMSG_DATA(cmh);
+			struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
 
 			cmh->cmsg_level = SOL_IPV6;
 			cmh->cmsg_type = IPV6_PKTINFO;
-			pki->ipi6_ifindex = 0;
-			ipv6_addr_copy(&pki->ipi6_addr,
-					&rqstp->rq_daddr.addr6);
+			pki->ipi6_ifindex = daddr->sin6_scope_id;
+			ipv6_addr_copy(&pki->ipi6_addr,	&daddr->sin6_addr);
 			cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
 		}
 		break;
@@ -498,9 +499,13 @@ static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
 				     struct cmsghdr *cmh)
 {
 	struct in_pktinfo *pki = CMSG_DATA(cmh);
+	struct sockaddr_in *daddr = svc_daddr_in(rqstp);
+
 	if (cmh->cmsg_type != IP_PKTINFO)
 		return 0;
-	rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
+
+	daddr->sin_family = AF_INET;
+	daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
 	return 1;
 }
 
@@ -511,9 +516,14 @@ static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
 				     struct cmsghdr *cmh)
 {
 	struct in6_pktinfo *pki = CMSG_DATA(cmh);
+	struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
+
 	if (cmh->cmsg_type != IPV6_PKTINFO)
 		return 0;
-	ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
+
+	daddr->sin6_family = AF_INET6;
+	ipv6_addr_copy(&daddr->sin6_addr, &pki->ipi6_addr);
+	daddr->sin6_scope_id = pki->ipi6_ifindex;
 	return 1;
 }
 
@@ -614,6 +624,7 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
 		skb_free_datagram_locked(svsk->sk_sk, skb);
 		return 0;
 	}
+	rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
 
 	if (skb_is_nonlinear(skb)) {
 		/* we have to copy */
-- 
1.7.6



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