From 18402843bf88c2e9674e1a3a05c73b7d9b09ee05 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 19 Apr 2016 14:30:10 -0400 Subject: net: Align IFLA_STATS64 attributes properly on architectures that need it. Since the nlattr header is 4 bytes in size, it can cause the netlink attribute payload to not be 8-byte aligned. This is particularly troublesome for IFLA_STATS64 which contains 64-bit statistic values. Solve this by creating a dummy IFLA_PAD attribute which has a payload which is zero bytes in size. When HAVE_EFFICIENT_UNALIGNED_ACCESS is false, we insert an IFLA_PAD attribute into the netlink response when necessary such that the IFLA_STATS64 payload will be properly aligned. With help and suggestions from Eric Dumazet. Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'net/core') diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index a7a3d345134a..198ca2c99510 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -878,6 +878,9 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev, + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ + nla_total_size(sizeof(struct rtnl_link_ifmap)) + nla_total_size(sizeof(struct rtnl_link_stats)) +#ifndef HAVE_EFFICIENT_UNALIGNED_ACCESS + + nla_total_size(0) /* IFLA_PAD */ +#endif + nla_total_size(sizeof(struct rtnl_link_stats64)) + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ @@ -1052,6 +1055,22 @@ static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, struct rtnl_link_stats64 *sp; struct nlattr *attr; +#ifndef HAVE_EFFICIENT_UNALIGNED_ACCESS + /* IF necessary, add a zero length NOP attribute so that the + * nla_data() of the IFLA_STATS64 will be 64-bit aligned. + * + * The nlattr header is 4 bytes in size, that's why we test + * if the skb->data _is_ aligned. This NOP attribute, plus + * nlattr header for IFLA_STATS64, will make nla_data() 8-byte + * aligned. + */ + if (IS_ALIGNED((unsigned long)skb->data, 8)) { + attr = nla_reserve(skb, IFLA_PAD, 0); + if (!attr) + return -EMSGSIZE; + } +#endif + attr = nla_reserve(skb, IFLA_STATS64, sizeof(struct rtnl_link_stats64)); if (!attr) -- cgit v1.2.3