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-rw-r--r--package/utils/busybox/patches/302-netlink-alignment.patch100
1 files changed, 100 insertions, 0 deletions
diff --git a/package/utils/busybox/patches/302-netlink-alignment.patch b/package/utils/busybox/patches/302-netlink-alignment.patch
new file mode 100644
index 0000000000..4cd25b1872
--- /dev/null
+++ b/package/utils/busybox/patches/302-netlink-alignment.patch
@@ -0,0 +1,100 @@
+From a843f09a4d4428cf11ca02307e60058251b05743 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Fri, 16 Sep 2016 21:52:03 +0200
+Subject: [PATCH] libnetlink: fix alignment of netlink messages
+
+An padding to align a message should not only be added between
+different attributes of a netlink message, but also at the end of the
+message to pad it to the correct size.
+
+Without this patch the following command does not work and returns an
+error code:
+ip link add type nlmon
+
+Without this ip from busybox sends this:
+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
+return value: 2
+
+The normal ip utile from iproute2 sends this:
+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
+return value: 0
+
+With this patch ip from busybox sends this:
+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
+return value: 0
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+---
+ networking/libiproute/libnetlink.c | 16 ++++++++--------
+ 1 file changed, 8 insertions(+), 8 deletions(-)
+
+--- a/networking/libiproute/libnetlink.c
++++ b/networking/libiproute/libnetlink.c
+@@ -338,14 +338,14 @@ int FAST_FUNC addattr32(struct nlmsghdr
+ int len = RTA_LENGTH(4);
+ struct rtattr *rta;
+
+- if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) {
++ if ((int)(NLMSG_ALIGN(n->nlmsg_len + len)) > maxlen) {
+ return -1;
+ }
+ rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
+ rta->rta_type = type;
+ rta->rta_len = len;
+ move_to_unaligned32(RTA_DATA(rta), data);
+- n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
++ n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len + len);
+ return 0;
+ }
+
+@@ -354,14 +354,14 @@ int FAST_FUNC addattr_l(struct nlmsghdr
+ int len = RTA_LENGTH(alen);
+ struct rtattr *rta;
+
+- if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) {
++ if ((int)(NLMSG_ALIGN(n->nlmsg_len + len)) > maxlen) {
+ return -1;
+ }
+ rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
+ rta->rta_type = type;
+ rta->rta_len = len;
+ memcpy(RTA_DATA(rta), data, alen);
+- n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
++ n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len + len);
+ return 0;
+ }
+
+@@ -370,14 +370,14 @@ int FAST_FUNC rta_addattr32(struct rtatt
+ int len = RTA_LENGTH(4);
+ struct rtattr *subrta;
+
+- if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
++ if (RTA_ALIGN(rta->rta_len + len) > maxlen) {
+ return -1;
+ }
+ subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
+ subrta->rta_type = type;
+ subrta->rta_len = len;
+ move_to_unaligned32(RTA_DATA(subrta), data);
+- rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
++ rta->rta_len = NLMSG_ALIGN(rta->rta_len + len);
+ return 0;
+ }
+
+@@ -386,14 +386,14 @@ int FAST_FUNC rta_addattr_l(struct rtatt
+ struct rtattr *subrta;
+ int len = RTA_LENGTH(alen);
+
+- if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
++ if (RTA_ALIGN(rta->rta_len + len) > maxlen) {
+ return -1;
+ }
+ subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
+ subrta->rta_type = type;
+ subrta->rta_len = len;
+ memcpy(RTA_DATA(subrta), data, alen);
+- rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
++ rta->rta_len = NLMSG_ALIGN(rta->rta_len + len);
+ return 0;
+ }
+