[PATCH net-next 5/9] afs: Sort address lists so that they are in logical ascending order

From: David Howells
Date: Thu Oct 04 2018 - 09:51:20 EST


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@xxxxxxxxxx>
---

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 00e87f859b9f..89374de4785c 100644
--- a/fs/afs/addr_list.c
+++ b/fs/afs/addr_list.c
@@ -232,22 +232,23 @@ struct afs_addr_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;
}

@@ -256,12 +257,12 @@ 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++;
}
@@ -271,21 +272,20 @@ 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;
@@ -296,12 +296,9 @@ 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++;
}