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netdev: Add padding to netlink family headers

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Use the NLMSG_ALIGN macro on the family header size (struct ifinfomsg in
this case).  The ascii graphics in include/net/netlink.h show that both
the netlink header and the family header should be padded.  The netlink
header (nlmsghdr) is already padded in ell.  To "document" this
requirementin ell what we could do is take two buffers, one for the
family header and one for the attributes.

This doesn't change anything for most people because ifinfomsg is
already 16-byte long on the usual architectures.
This commit is contained in:
Andrew Zaborowski 2016-11-07 16:42:02 +01:00 committed by Denis Kenzior
parent a7a3e7e7f7
commit e9e9358898
1 changed files with 4 additions and 4 deletions
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8
src/netdev.c
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@ -138,7 +138,7 @@ static void netdev_set_linkmode_and_operstate(uint32_t ifindex,
size_t bufsize;
struct cb_data *cb_data = NULL;
bufsize = sizeof(struct ifinfomsg) +
bufsize = NLMSG_ALIGN(sizeof(struct ifinfomsg)) +
RTA_SPACE(sizeof(uint8_t)) + RTA_SPACE(sizeof(uint8_t));
rtmmsg = l_malloc(bufsize);
@ -147,7 +147,7 @@ static void netdev_set_linkmode_and_operstate(uint32_t ifindex,
rtmmsg->ifi_family = AF_UNSPEC;
rtmmsg->ifi_index = ifindex;
rta_buf = rtmmsg + 1;
rta_buf = (void *) rtmmsg + NLMSG_ALIGN(sizeof(struct ifinfomsg));
rta_buf += rta_add_u8(rta_buf, IFLA_LINKMODE, linkmode);
rta_buf += rta_add_u8(rta_buf, IFLA_OPERSTATE, operstate);
@ -230,7 +230,7 @@ int netdev_set_powered(struct netdev *netdev, bool powered,
size_t bufsize;
struct set_powered_cb_data *cb_data = NULL;
bufsize = sizeof(struct ifinfomsg);
bufsize = NLMSG_ALIGN(sizeof(struct ifinfomsg));
rtmmsg = l_malloc(bufsize);
memset(rtmmsg, 0, bufsize);
@ -1780,7 +1780,7 @@ static void netdev_create_from_genl(struct l_genl_msg *msg)
l_debug("Created interface %s[%d]", netdev->name, netdev->index);
/* Query interface flags */
bufsize = sizeof(struct ifinfomsg);
bufsize = NLMSG_ALIGN(sizeof(struct ifinfomsg));
rtmmsg = l_malloc(bufsize);
memset(rtmmsg, 0, bufsize);