linux-kernel - [PATCH 6/6] afs: Sort address lists so that they are in logical ascending order

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Date:   Thu, 13 Sep 2018 17:09:41 +0100
From:   David Howells <dhowells@...hat.com>
To:     viro@...iv.linux.org.uk
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        keyrings@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 6/6] afs: Sort address lists so that they are in logical
 ascending order

Sort address lists so that they are in logical ascending order rather than
being partially in ascending order of the BE representations of those
values.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/afs/addr_list.c |   51 ++++++++++++++++++++++++---------------------------
 1 file changed, 24 insertions(+), 27 deletions(-)

diff --git a/fs/afs/addr_list.c b/fs/afs/addr_list.c
index a7fdc05ba8d2..99aa75aa5f07 100644
--- a/fs/afs/addr_list.c
+++ b/fs/afs/addr_list.c
@@ -251,22 +251,23 @@ struct afs_vlserver_list *afs_dns_query(struct afs_cell *cell, time64_t *_expiry
  */
 void afs_merge_fs_addr4(struct afs_addr_list *alist, __be32 xdr, u16 port)
 {
-	struct sockaddr_in6 *a;
-	__be16 xport = htons(port);
+	struct sockaddr_in6 *p;
+	u32 addr = ntohl(xdr);
 	int i;
 
 	if (alist->nr_addrs >= alist->max_addrs)
 		return;
 
 	for (i = 0; i < alist->nr_ipv4; i++) {
-		a = &alist->addrs[i].transport.sin6;
-		if (xdr == a->sin6_addr.s6_addr32[3] &&
-		    xport == a->sin6_port)
+		struct sockaddr_in6 *a = &alist->addrs[i].transport.sin6;
+		u32 a_addr = ntohl(a->sin6_addr.s6_addr32[3]);
+		u16 a_port = ntohs(a->sin6_port);
+
+		if (addr == a_addr && port == a_port)
 			return;
-		if (xdr == a->sin6_addr.s6_addr32[3] &&
-		    (u16 __force)xport < (u16 __force)a->sin6_port)
+		if (addr == a_addr && port < a_port)
 			break;
-		if ((u32 __force)xdr < (u32 __force)a->sin6_addr.s6_addr32[3])
+		if (addr < a_addr)
 			break;
 	}
 
@@ -275,12 +276,12 @@ void afs_merge_fs_addr4(struct afs_addr_list *alist, __be32 xdr, u16 port)
 			alist->addrs + i,
 			sizeof(alist->addrs[0]) * (alist->nr_addrs - i));
 
-	a = &alist->addrs[i].transport.sin6;
-	a->sin6_port		  = xport;
-	a->sin6_addr.s6_addr32[0] = 0;
-	a->sin6_addr.s6_addr32[1] = 0;
-	a->sin6_addr.s6_addr32[2] = htonl(0xffff);
-	a->sin6_addr.s6_addr32[3] = xdr;
+	p = &alist->addrs[i].transport.sin6;
+	p->sin6_port		  = htons(port);
+	p->sin6_addr.s6_addr32[0] = 0;
+	p->sin6_addr.s6_addr32[1] = 0;
+	p->sin6_addr.s6_addr32[2] = htonl(0xffff);
+	p->sin6_addr.s6_addr32[3] = xdr;
 	alist->nr_ipv4++;
 	alist->nr_addrs++;
 }
@@ -290,21 +291,20 @@ void afs_merge_fs_addr4(struct afs_addr_list *alist, __be32 xdr, u16 port)
  */
 void afs_merge_fs_addr6(struct afs_addr_list *alist, __be32 *xdr, u16 port)
 {
-	struct sockaddr_in6 *a;
-	__be16 xport = htons(port);
+	struct sockaddr_in6 *p;
 	int i, diff;
 
 	if (alist->nr_addrs >= alist->max_addrs)
 		return;
 
 	for (i = alist->nr_ipv4; i < alist->nr_addrs; i++) {
-		a = &alist->addrs[i].transport.sin6;
+		struct sockaddr_in6 *a = &alist->addrs[i].transport.sin6;
+		u16 a_port = ntohs(a->sin6_port);
+
 		diff = memcmp(xdr, &a->sin6_addr, 16);
-		if (diff == 0 &&
-		    xport == a->sin6_port)
+		if (diff == 0 && port == a_port)
 			return;
-		if (diff == 0 &&
-		    (u16 __force)xport < (u16 __force)a->sin6_port)
+		if (diff == 0 && port < a_port)
 			break;
 		if (diff < 0)
 			break;
@@ -315,12 +315,9 @@ void afs_merge_fs_addr6(struct afs_addr_list *alist, __be32 *xdr, u16 port)
 			alist->addrs + i,
 			sizeof(alist->addrs[0]) * (alist->nr_addrs - i));
 
-	a = &alist->addrs[i].transport.sin6;
-	a->sin6_port		  = xport;
-	a->sin6_addr.s6_addr32[0] = xdr[0];
-	a->sin6_addr.s6_addr32[1] = xdr[1];
-	a->sin6_addr.s6_addr32[2] = xdr[2];
-	a->sin6_addr.s6_addr32[3] = xdr[3];
+	p = &alist->addrs[i].transport.sin6;
+	p->sin6_port = htons(port);
+	memcpy(&p->sin6_addr, xdr, 16);
 	alist->nr_addrs++;
 }