[PATCH 4.20 33/76] ipv4: Add ICMPv6 support when parse route ipproto

Greg Kroah-Hartman
2019-03-08T13:05:37Z

From: Hangbin Liu <liuhangbin@gmail.com>

[ Upstream commit 5e1a99eae84999a2536f50a0beaf5d5262337f40 ]

For ip rules, we need to use 'ipproto ipv6-icmp' to match ICMPv6 headers.
But for ip -6 route, currently we only support tcp, udp and icmp.

Add ICMPv6 support so we can match ipv6-icmp rules for route lookup.

v2: As David Ahern and Sabrina Dubroca suggested, Add an argument to
rtm_getroute_parse_ip_proto() to handle ICMP/ICMPv6 with different family.

Reported-by: Jianlin Shi <jishi@redhat.com>
Fixes: eacb9384a3fe ("ipv6: support sport, dport and ip_proto in RTM_GETROUTE")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/net/ip.h | 2 +-
net/ipv4/netlink.c | 17 +++++++++++++----
net/ipv4/route.c | 2 +-
net/ipv6/route.c | 3 ++-
4 files changed, 17 insertions(+), 7 deletions(-)

--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -714,7 +714,7 @@ extern int sysctl_icmp_msgs_burst;
int ip_misc_proc_init(void);
#endif

-int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto,
+int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
struct netlink_ext_ack *extack);

#endif /* _IP_H */
--- a/net/ipv4/netlink.c
+++ b/net/ipv4/netlink.c
@@ -3,9 +3,10 @@
#include <linux/types.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
+#include <linux/in6.h>
#include <net/ip.h>

-int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto,
+int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
struct netlink_ext_ack *extack)
{
*ip_proto = nla_get_u8(attr);
@@ -13,11 +14,19 @@ int rtm_getroute_parse_ip_proto(struct n
switch (*ip_proto) {
case IPPROTO_TCP:
case IPPROTO_UDP:
+ return 0;
case IPPROTO_ICMP:
+ if (family != AF_INET)
+ break;
+ return 0;
+#if IS_ENABLED(CONFIG_IPV6)
+ case IPPROTO_ICMPV6:
+ if (family != AF_INET6)
+ break;
return 0;
- default:
- NL_SET_ERR_MSG(extack, "Unsupported ip proto");
- return -EOPNOTSUPP;
+#endif
}
+ NL_SET_ERR_MSG(extack, "Unsupported ip proto");
+ return -EOPNOTSUPP;
}
EXPORT_SYMBOL_GPL(rtm_getroute_parse_ip_proto);
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2803,7 +2803,7 @@ static int inet_rtm_getroute(struct sk_b

if (tb[RTA_IP_PROTO]) {
err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
- &ip_proto, extack);
+ &ip_proto, AF_INET, extack);
if (err)
return err;
}
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4880,7 +4880,8 @@ static int inet6_rtm_getroute(struct sk_

if (tb[RTA_IP_PROTO]) {
err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
- &fl6.flowi6_proto, extack);
+ &fl6.flowi6_proto, AF_INET6,
+ extack);
if (err)
goto errout;
}