[PATCH net-next v3 2/4] rtnetlink: add restricted rtnl groups for ipv4 and ipv6 mroute

[Julien Gomes]

Add RTNLGRP_{IPV4,IPV6}_MROUTE_R as two new restricted groups for the
NETLINK_ROUTE family.
Binding to these groups specifically requires CAP_NET_ADMIN to allow
multicast of sensitive messages (e.g. mroute cache reports).

Suggested-by: Nikolay Aleksandrov <niko...@cumulusnetworks.com>
Signed-off-by: Julien Gomes <jul...@arista.com>
Signed-off-by: Nikolay Aleksandrov <niko...@cumulusnetworks.com>
---
 include/uapi/linux/rtnetlink.h |  4 ++++
 net/core/rtnetlink.c           | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index cd1afb900929..d148505010a7 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -669,6 +669,10 @@ enum rtnetlink_groups {
 #define RTNLGRP_NSID           RTNLGRP_NSID
        RTNLGRP_MPLS_NETCONF,
 #define RTNLGRP_MPLS_NETCONF   RTNLGRP_MPLS_NETCONF
+       RTNLGRP_IPV4_MROUTE_R,
+#define RTNLGRP_IPV4_MROUTE_R  RTNLGRP_IPV4_MROUTE_R
+       RTNLGRP_IPV6_MROUTE_R,
+#define RTNLGRP_IPV6_MROUTE_R  RTNLGRP_IPV6_MROUTE_R
        __RTNLGRP_MAX
 };
 #define RTNLGRP_MAX    (__RTNLGRP_MAX - 1)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 3aa57848a895..4aefa5a2625f 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -4218,6 +4218,18 @@ static void rtnetlink_rcv(struct sk_buff *skb)
        rtnl_unlock();
 }
 
+static int rtnetlink_bind(struct net *net, int group)
+{
+       switch (group) {
+       case RTNLGRP_IPV4_MROUTE_R:
+       case RTNLGRP_IPV6_MROUTE_R:
+               if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+                       return -EPERM;
+               break;
+       }
+       return 0;
+}
+
 static int rtnetlink_event(struct notifier_block *this, unsigned long event, 
void *ptr)
 {
        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
@@ -4252,6 +4264,7 @@ static int __net_init rtnetlink_net_init(struct net *net)
                .input          = rtnetlink_rcv,
                .cb_mutex       = &rtnl_mutex,
                .flags          = NL_CFG_F_NONROOT_RECV,
+               .bind           = rtnetlink_bind,
        };
 
        sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
-- 
2.13.1