diff options
| author |   Yuyang Huang <yuyanghuang@google.com> | 2024-12-21 19:00:07 +0900 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2024-12-23 10:26:43 -0800 |
| commit | aa4ad7c3f283fa94b80cf84605661700aa39d708 (patch) | |
| tree | 20dc0f538998486cdd628220b9d40fdb174db946 | |
| parent | selftests: drv-net: assume stats refresh is 0 if no ethtool -c support (diff) | |
| download | wireguard-linux-aa4ad7c3f283fa94b80cf84605661700aa39d708.tar.xz wireguard-linux-aa4ad7c3f283fa94b80cf84605661700aa39d708.zip | |
netlink: correct nlmsg size for multicast notifications
Corrected the netlink message size calculation for multicast group
join/leave notifications. The previous calculation did not account for
the inclusion of both IPv4/IPv6 addresses and ifa_cacheinfo in the
payload. This fix ensures that the allocated message size is
sufficient to hold all necessary information.
This patch also includes the following improvements:
* Uses GFP_KERNEL instead of GFP_ATOMIC when holding the RTNL mutex.
* Uses nla_total_size(sizeof(struct in6_addr)) instead of
nla_total_size(16).
* Removes unnecessary EXPORT_SYMBOL().
Fixes: 2c2b61d2138f ("netlink: add IGMP/MLD join/leave notifications")
Cc: Maciej Żenczykowski <maze@google.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: Yuyang Huang <yuyanghuang@google.com>
Link: https://patch.msgid.link/20241221100007.1910089-1-yuyanghuang@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/ipv4/igmp.c | 6 | ||||
| -rw-r--r-- | net/ipv6/addrconf.c | 1 | ||||
| -rw-r--r-- | net/ipv6/mcast.c | 6 |
3 files changed, 8 insertions, 5 deletions
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index 8a370ef37d3f..3da126cea884 100644 --- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -1473,7 +1473,9 @@ static void inet_ifmcaddr_notify(struct net_device *dev, int err = -ENOMEM; skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + - nla_total_size(sizeof(__be32)), GFP_ATOMIC); + nla_total_size(sizeof(__be32)) + + nla_total_size(sizeof(struct ifa_cacheinfo)), + GFP_KERNEL); if (!skb) goto error; @@ -1484,7 +1486,7 @@ static void inet_ifmcaddr_notify(struct net_device *dev, goto error; } - rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MCADDR, NULL, GFP_ATOMIC); + rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MCADDR, NULL, GFP_KERNEL); return; error: rtnl_set_sk_err(net, RTNLGRP_IPV4_MCADDR, err); diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 2e2684886953..4da409bc4577 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -5239,7 +5239,6 @@ int inet6_fill_ifmcaddr(struct sk_buff *skb, nlmsg_end(skb, nlh); return 0; } -EXPORT_SYMBOL(inet6_fill_ifmcaddr); static int inet6_fill_ifacaddr(struct sk_buff *skb, const struct ifacaddr6 *ifaca, diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index 587831c148de..9dfdb40988b0 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -920,7 +920,9 @@ static void inet6_ifmcaddr_notify(struct net_device *dev, int err = -ENOMEM; skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + - nla_total_size(16), GFP_ATOMIC); + nla_total_size(sizeof(struct in6_addr)) + + nla_total_size(sizeof(struct ifa_cacheinfo)), + GFP_KERNEL); if (!skb) goto error; @@ -931,7 +933,7 @@ static void inet6_ifmcaddr_notify(struct net_device *dev, goto error; } - rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MCADDR, NULL, GFP_ATOMIC); + rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MCADDR, NULL, GFP_KERNEL); return; error: rtnl_set_sk_err(net, RTNLGRP_IPV6_MCADDR, err); |