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authorJan Luebbe2018-02-14 14:05:27 +0100
committerDenys Vlasenko2018-02-20 19:43:32 +0100
commite789c3bea18181723c4ae7d761ec30926d182cfb (patch)
treea1d5abfc03412982db4d538c0ad424a46c91f4ac
parent79cda9522ad390f1bdb7ba1025b1c81bbd1613e6 (diff)
downloadbusybox-e789c3bea18181723c4ae7d761ec30926d182cfb.zip
busybox-e789c3bea18181723c4ae7d761ec30926d182cfb.tar.gz
iplink: implement support for selecting a master interface
Attaching an interface to a VRF is done by setting the interface's master. Besides VRF, this can also be used for bridges. function old new delta set_master - 142 +142 do_iplink 1262 1357 +95 packed_usage 32546 32539 -7 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/1 up/down: 237/-7) Total: 230 bytes Signed-off-by: Jan Luebbe <jluebbe@debian.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--networking/ip.c3
-rw-r--r--networking/libiproute/iplink.c38
-rw-r--r--networking/tcpudp.c2
3 files changed, 41 insertions, 2 deletions
diff --git a/networking/ip.c b/networking/ip.c
index 665f9bc..accf907 100644
--- a/networking/ip.c
+++ b/networking/ip.c
@@ -156,7 +156,8 @@
//--------------123456789.123456789.123456789.123456789.123456789.123456789.123456789.123....79
//usage:#define iplink_trivial_usage
//usage: /*Usage:iplink*/"set IFACE [up|down] [arp on|off] [multicast on|off]\n"
-//usage: " [promisc on|off] [mtu NUM] [name NAME] [qlen NUM] [address MAC]"
+//usage: " [promisc on|off] [mtu NUM] [name NAME] [qlen NUM] [address MAC]\n"
+//usage: " [master IFACE | nomaster]\n"
// * short help shows only "set" command, long help continues (with just one "\n")
// * and shows all other commands:
//usage:#define iplink_full_usage "\n"
diff --git a/networking/libiproute/iplink.c b/networking/libiproute/iplink.c
index 3122833..2aa8b68 100644
--- a/networking/libiproute/iplink.c
+++ b/networking/libiproute/iplink.c
@@ -128,6 +128,31 @@ static void set_mtu(char *dev, int mtu)
}
/* Exits on error */
+static void set_master(char *dev, int master)
+{
+ struct rtnl_handle rth;
+ struct {
+ struct nlmsghdr n;
+ struct ifinfomsg i;
+ char buf[1024];
+ } req;
+
+ memset(&req, 0, sizeof(req));
+
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST;
+ req.n.nlmsg_type = RTM_NEWLINK;
+ req.i.ifi_family = preferred_family;
+
+ xrtnl_open(&rth);
+ req.i.ifi_index = xll_name_to_index(dev);
+ //printf("master %i for %i\n", master, req.i.ifi_index);
+ addattr_l(&req.n, sizeof(req), IFLA_MASTER, &master, 4);
+ if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
+ xfunc_die();
+}
+
+/* Exits on error */
static int get_address(char *dev, int *htype)
{
struct ifreq ifr;
@@ -200,6 +225,7 @@ static int do_set(char **argv)
uint32_t flags = 0;
int qlen = -1;
int mtu = -1;
+ int master = -1;
char *newaddr = NULL;
char *newbrd = NULL;
struct ifreq ifr0, ifr1;
@@ -209,9 +235,11 @@ static int do_set(char **argv)
static const char keywords[] ALIGN1 =
"up\0""down\0""name\0""mtu\0""qlen\0""multicast\0"
"arp\0""promisc\0""address\0"
+ "master\0""nomaster\0"
"dev\0" /* must be last */;
enum { ARG_up = 0, ARG_down, ARG_name, ARG_mtu, ARG_qlen, ARG_multicast,
ARG_arp, ARG_promisc, ARG_addr,
+ ARG_master, ARG_nomaster,
ARG_dev };
enum { PARM_on = 0, PARM_off };
smalluint key;
@@ -243,6 +271,11 @@ static int do_set(char **argv)
} else if (key == ARG_addr) {
NEXT_ARG();
newaddr = *argv;
+ } else if (key == ARG_master) {
+ NEXT_ARG();
+ master = xll_name_to_index(*argv);
+ } else if (key == ARG_nomaster) {
+ master = 0;
} else if (key >= ARG_dev) {
/* ^^^^^^ ">=" here results in "dev IFACE" treated as default */
if (key == ARG_dev) {
@@ -427,6 +460,9 @@ static int do_set(char **argv)
if (mtu != -1) {
set_mtu(dev, mtu);
}
+ if (master != -1) {
+ set_master(dev, master);
+ }
if (mask)
do_chflags(dev, flags, mask);
return 0;
@@ -673,6 +709,8 @@ int FAST_FUNC do_iplink(char **argv)
{
static const char keywords[] ALIGN1 =
"add\0""delete\0""set\0""show\0""lst\0""list\0";
+
+ xfunc_error_retval = 2; //TODO: move up to "ip"? Is it the common rule for all "ip" tools?
if (*argv) {
int key = index_in_substrings(keywords, *argv);
if (key < 0) /* invalid argument */
diff --git a/networking/tcpudp.c b/networking/tcpudp.c
index d4c69e0..2feb63a 100644
--- a/networking/tcpudp.c
+++ b/networking/tcpudp.c
@@ -318,7 +318,7 @@ int tcpudpsvd_main(int argc UNUSED_PARAM, char **argv)
sslser = user;
client = 0;
if ((getuid() == 0) && !(opts & OPT_u)) {
- xfunc_exitcode = 100;
+ xfunc_error_retval = 100;
bb_error_msg_and_die(bb_msg_you_must_be_root);
}
if (opts & OPT_u)