| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 14 Feb 2013 05:25:44 +0100
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
To: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Cc: Brian Haley <brian.haley@...com>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] ipv6: use newly introduced __ipv6_addr_needs_scope_id and ipv6_iface_scope_id
On Thu, Feb 14, 2013 at 01:47:47AM +0900, YOSHIFUJI Hideaki wrote:
> If you have several address checks around, please use ipv6_addr_type()
> (or __ipv6_addr_type()). Above "direct" checks should be used only for
> single-shot test. But well, I have to agree that ipv6_addr_type and
> friends is becoming complex. In mid-term, I would like to take look
> at it. I might think of having addr_type for src/dst in skb->cb
> after all.
What do you think about the attached patch? If you agree with the changes I
would test it tomorrow and rebase my other patches ontop. The changes are only
compile tested.
[PATCH net-next RFC] ipv6: introduce new type ipv6_addr_props to hold type and scope
---
include/net/ipv6.h | 16 +++++---
net/ipv6/addrconf.c | 27 +++++++-------
net/ipv6/addrconf_core.c | 97 +++++++++++++++++++++++++++++++-----------------
net/ipv6/datagram.c | 12 +++---
4 files changed, 95 insertions(+), 57 deletions(-)
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 851d541..3a3ec1cc 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -298,20 +298,26 @@ static inline int ip6_frag_mem(struct net *net)
#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
-extern int __ipv6_addr_type(const struct in6_addr *addr);
+struct ipv6_addr_props {
+ u16 type;
+ s16 scope;
+};
+
+extern struct ipv6_addr_props __ipv6_addr_type(const struct in6_addr *addr);
static inline int ipv6_addr_type(const struct in6_addr *addr)
{
- return __ipv6_addr_type(addr) & 0xffff;
+ return __ipv6_addr_type(addr).type;
}
static inline int ipv6_addr_scope(const struct in6_addr *addr)
{
- return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
+ return __ipv6_addr_type(addr).scope;
}
-static inline int __ipv6_addr_src_scope(int type)
+static inline int __ipv6_addr_src_scope(struct ipv6_addr_props props)
{
- return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
+ return (props.type == IPV6_ADDR_ANY) ?
+ __IPV6_ADDR_SCOPE_INVALID : props.scope;
}
static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 86c235d..f9adec4 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1106,7 +1106,7 @@ enum {
struct ipv6_saddr_score {
int rule;
- int addr_type;
+ struct ipv6_addr_props addr_props;
struct inet6_ifaddr *ifa;
DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
int scopedist;
@@ -1180,7 +1180,7 @@ static int ipv6_get_saddr_eval(struct net *net,
* C > d + 14 - B >= 15 + 14 - B = 29 - B.
* Assume B = 0 and we get C > 29.
*/
- ret = __ipv6_addr_src_scope(score->addr_type);
+ ret = __ipv6_addr_src_scope(score->addr_props);
if (ret >= dst->scope)
ret = -ret;
else
@@ -1189,8 +1189,9 @@ static int ipv6_get_saddr_eval(struct net *net,
break;
case IPV6_SADDR_RULE_PREFERRED:
/* Rule 3: Avoid deprecated and optimistic addresses */
- ret = ipv6_saddr_preferred(score->addr_type) ||
- !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
+ ret = ipv6_saddr_preferred(score->addr_props.type) ||
+ !(score->ifa->flags &
+ (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
break;
#ifdef CONFIG_IPV6_MIP6
case IPV6_SADDR_RULE_HOA:
@@ -1209,7 +1210,7 @@ static int ipv6_get_saddr_eval(struct net *net,
case IPV6_SADDR_RULE_LABEL:
/* Rule 6: Prefer matching label */
ret = ipv6_addr_label(net,
- &score->ifa->addr, score->addr_type,
+ &score->ifa->addr, score->addr_props.type,
score->ifa->idev->dev->ifindex) == dst->label;
break;
#ifdef CONFIG_IPV6_PRIVACY
@@ -1258,13 +1259,12 @@ int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
*score = &scores[0], *hiscore = &scores[1];
struct ipv6_saddr_dst dst;
struct net_device *dev;
- int dst_type;
+ struct ipv6_addr_props dst_props = __ipv6_addr_type(daddr);
- dst_type = __ipv6_addr_type(daddr);
dst.addr = daddr;
dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
- dst.scope = __ipv6_addr_src_scope(dst_type);
- dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
+ dst.scope = __ipv6_addr_src_scope(dst_props);
+ dst.label = ipv6_addr_label(net, daddr, dst_props.type, dst.ifindex);
dst.prefs = prefs;
hiscore->rule = -1;
@@ -1287,7 +1287,7 @@ int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
* belonging to the same site as the outgoing
* interface.)
*/
- if (((dst_type & IPV6_ADDR_MULTICAST) ||
+ if ((dst_props.type & IPV6_ADDR_MULTICAST ||
dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
dst.ifindex && dev->ifindex != dst.ifindex)
continue;
@@ -1314,10 +1314,11 @@ int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
(!(score->ifa->flags & IFA_F_OPTIMISTIC)))
continue;
- score->addr_type = __ipv6_addr_type(&score->ifa->addr);
+ score->addr_props = __ipv6_addr_type(&score->ifa->addr);
- if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
- score->addr_type & IPV6_ADDR_MULTICAST)) {
+ if (unlikely(score->addr_props.type == IPV6_ADDR_ANY ||
+ score->addr_props.type &
+ IPV6_ADDR_MULTICAST)) {
LIMIT_NETDEBUG(KERN_DEBUG
"ADDRCONF: unspecified / multicast address "
"assigned as unicast address on %s",
diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
index d051e5f..cb3eb1d 100644
--- a/net/ipv6/addrconf_core.c
+++ b/net/ipv6/addrconf_core.c
@@ -6,75 +6,104 @@
#include <linux/export.h>
#include <net/ipv6.h>
-#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
-
-static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
+static inline struct ipv6_addr_props ipv6_addr_scope2type(unsigned int scope)
{
switch (scope) {
case IPV6_ADDR_SCOPE_NODELOCAL:
- return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
- IPV6_ADDR_LOOPBACK);
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_MULTICAST|IPV6_ADDR_LOOPBACK,
+ .scope = IPV6_ADDR_SCOPE_NODELOCAL
+ };
case IPV6_ADDR_SCOPE_LINKLOCAL:
- return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
- IPV6_ADDR_LINKLOCAL);
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL,
+ .scope = IPV6_ADDR_SCOPE_LINKLOCAL
+ };
case IPV6_ADDR_SCOPE_SITELOCAL:
- return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
- IPV6_ADDR_SITELOCAL);
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_MULTICAST|IPV6_ADDR_SITELOCAL,
+ .scope = IPV6_ADDR_SCOPE_SITELOCAL
+ };
}
- return IPV6_ADDR_SCOPE_TYPE(scope);
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_MULTICAST,
+ .scope = scope
+ };
}
-int __ipv6_addr_type(const struct in6_addr *addr)
+struct ipv6_addr_props __ipv6_addr_type(const struct in6_addr *addr)
{
- __be32 st;
-
- st = addr->s6_addr32[0];
+ __be32 st = addr->s6_addr32[0];
/* Consider all addresses with the first three bits different of
000 and 111 as unicasts.
*/
if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
(st & htonl(0xE0000000)) != htonl(0xE0000000))
- return (IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_UNICAST,
+ .scope = IPV6_ADDR_SCOPE_GLOBAL
+ };
if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
/* multicast */
/* addr-select 3.1 */
- return (IPV6_ADDR_MULTICAST |
- ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
+ return ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr));
}
if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
- return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
+ /* addr-select 3.1 */
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST,
+ .scope = IPV6_ADDR_SCOPE_LINKLOCAL
+ };
if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
- return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
+ /* addr-select 3.1 */
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST,
+ .scope = IPV6_ADDR_SCOPE_SITELOCAL,
+ };
if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
- return (IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
+ /* RFC 4193 */
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_UNICAST,
+ .scope = IPV6_ADDR_SCOPE_GLOBAL,
+ };
if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
if (addr->s6_addr32[2] == 0) {
if (addr->s6_addr32[3] == 0)
- return IPV6_ADDR_ANY;
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_ANY
+ };
if (addr->s6_addr32[3] == htonl(0x00000001))
- return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
+ /* addr-select 3.4 */
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_LOOPBACK|
+ IPV6_ADDR_UNICAST,
+ .scope = IPV6_ADDR_SCOPE_LINKLOCAL
+ };
- return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
+ /* addr-select 3.3 */
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_COMPATv4|IPV6_ADDR_UNICAST,
+ .scope = IPV6_ADDR_SCOPE_GLOBAL
+ };
}
if (addr->s6_addr32[2] == htonl(0x0000ffff))
- return (IPV6_ADDR_MAPPED |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
+ /* addr-select 3.3 */
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_MAPPED,
+ .scope = IPV6_ADDR_SCOPE_GLOBAL
+ };
}
- return (IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
+ /* addr-select 3.4 */
+ return (struct ipv6_addr_props){
+ .type = IPV6_ADDR_UNICAST,
+ .scope = IPV6_ADDR_SCOPE_GLOBAL
+ };
}
EXPORT_SYMBOL(__ipv6_addr_type);
-
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index f5a5478..e859899 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -614,7 +614,7 @@ int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
int err = 0;
for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
- int addr_type;
+ struct ipv6_addr_props addr_props;
if (!CMSG_OK(msg, cmsg)) {
err = -EINVAL;
@@ -644,7 +644,7 @@ int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
fl6->flowi6_oif = src_info->ipi6_ifindex;
}
- addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
+ addr_props = __ipv6_addr_type(&src_info->ipi6_addr);
rcu_read_lock();
if (fl6->flowi6_oif) {
@@ -653,13 +653,15 @@ int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
rcu_read_unlock();
return -ENODEV;
}
- } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
+ } else if (addr_props.type & IPV6_ADDR_LINKLOCAL) {
rcu_read_unlock();
return -EINVAL;
}
- if (addr_type != IPV6_ADDR_ANY) {
- int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
+ if (addr_props.type != IPV6_ADDR_ANY) {
+ int strict =
+ __ipv6_addr_src_scope(addr_props) <=
+ IPV6_ADDR_SCOPE_LINKLOCAL;
if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
!ipv6_chk_addr(net, &src_info->ipi6_addr,
strict ? dev : NULL, 0))
--
1.8.1.2
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists