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101 lines
3.9 KiB
Diff
101 lines
3.9 KiB
Diff
From a843f09a4d4428cf11ca02307e60058251b05743 Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Fri, 16 Sep 2016 21:52:03 +0200
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Subject: [PATCH] libnetlink: fix alignment of netlink messages
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An padding to align a message should not only be added between
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different attributes of a netlink message, but also at the end of the
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message to pad it to the correct size.
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Without this patch the following command does not work and returns an
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error code:
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ip link add type nlmon
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Without this ip from busybox sends this:
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sendmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base={{len=45, type=0x10 /* NLMSG_??? */, flags=NLM_F_REQUEST|NLM_F_ACK|0x600, seq=1474057401, pid=0}, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\22\0\t\0\1nlmon"}, iov_len=45}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 45
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return value: 2
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The normal ip utile from iproute2 sends this:
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sendmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base={{len=48, type=0x10 /* NLMSG_??? */, flags=NLM_F_REQUEST|NLM_F_ACK|0x600, seq=1473716938, pid=0}, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\22\0\t\0\1nlmon\0\0\0"}, iov_len=48}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 48
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return value: 0
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With this patch ip from busybox sends this:
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sendmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base={{len=48, type=0x10 /* NLMSG_??? */, flags=NLM_F_REQUEST|NLM_F_ACK|0x600, seq=1473716908, pid=0}, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\22\0\t\0\1nlmon\0\0\0"}, iov_len=48}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 48
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return value: 0
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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networking/libiproute/libnetlink.c | 16 ++++++++--------
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1 file changed, 8 insertions(+), 8 deletions(-)
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--- a/networking/libiproute/libnetlink.c
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+++ b/networking/libiproute/libnetlink.c
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@@ -338,14 +338,14 @@ int FAST_FUNC addattr32(struct nlmsghdr
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int len = RTA_LENGTH(4);
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struct rtattr *rta;
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- if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) {
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+ if ((int)(NLMSG_ALIGN(n->nlmsg_len + len)) > maxlen) {
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return -1;
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}
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rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
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rta->rta_type = type;
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rta->rta_len = len;
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move_to_unaligned32(RTA_DATA(rta), data);
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- n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
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+ n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len + len);
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return 0;
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}
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@@ -354,14 +354,14 @@ int FAST_FUNC addattr_l(struct nlmsghdr
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int len = RTA_LENGTH(alen);
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struct rtattr *rta;
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- if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) {
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+ if ((int)(NLMSG_ALIGN(n->nlmsg_len + len)) > maxlen) {
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return -1;
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}
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rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
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rta->rta_type = type;
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rta->rta_len = len;
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memcpy(RTA_DATA(rta), data, alen);
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- n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
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+ n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len + len);
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return 0;
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}
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@@ -370,14 +370,14 @@ int FAST_FUNC rta_addattr32(struct rtatt
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int len = RTA_LENGTH(4);
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struct rtattr *subrta;
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- if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
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+ if (RTA_ALIGN(rta->rta_len + len) > maxlen) {
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return -1;
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}
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subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
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subrta->rta_type = type;
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subrta->rta_len = len;
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move_to_unaligned32(RTA_DATA(subrta), data);
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- rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
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+ rta->rta_len = NLMSG_ALIGN(rta->rta_len + len);
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return 0;
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}
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@@ -386,14 +386,14 @@ int FAST_FUNC rta_addattr_l(struct rtatt
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struct rtattr *subrta;
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int len = RTA_LENGTH(alen);
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- if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
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+ if (RTA_ALIGN(rta->rta_len + len) > maxlen) {
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return -1;
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}
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subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
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subrta->rta_type = type;
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subrta->rta_len = len;
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memcpy(RTA_DATA(subrta), data, alen);
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- rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
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+ rta->rta_len = NLMSG_ALIGN(rta->rta_len + len);
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return 0;
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}
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