openwrt-xburst/package/ppp/patches/320-custom_iface_names.patch

--- a/pppd/main.c
+++ b/pppd/main.c
@@ -742,8 +742,11 @@ void
 set_ifunit(iskey)
     int iskey;
 {
-    info("Using interface %s%d", PPP_DRV_NAME, ifunit);
-    slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
+    if (use_ifname[0] == 0)
+	slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
+    else
+	slprintf(ifname, sizeof(ifname), "%s", use_ifname);
+    info("Using interface %s", ifname);
     script_setenv("IFNAME", ifname, iskey);
     if (iskey) {
 	create_pidfile(getpid());	/* write pid to file */
--- a/pppd/options.c
+++ b/pppd/options.c
@@ -111,6 +111,7 @@ int	log_to_fd = 1;		/* send log messages
 bool	log_default = 1;	/* log_to_fd is default (stdout) */
 int	maxfail = 10;		/* max # of unsuccessful connection attempts */
 char	linkname[MAXPATHLEN];	/* logical name for link */
+char	use_ifname[IFNAMSIZ];	/* physical name for PPP link */
 bool	tune_kernel;		/* may alter kernel settings */
 int	connect_delay = 1000;	/* wait this many ms after connect script */
 int	req_unit = -1;		/* requested interface unit */
@@ -264,6 +265,9 @@ option_t general_options[] = {
     { "linkname", o_string, linkname,
       "Set logical name for link",
       OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXPATHLEN },
+    { "ifname", o_string, use_ifname,
+      "Set physical name for PPP interface",
+      OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, IFNAMSIZ },
 
     { "maxfail", o_int, &maxfail,
       "Maximum number of unsuccessful connection attempts to allow",
--- a/pppd/pppd.h
+++ b/pppd/pppd.h
@@ -71,6 +71,10 @@
 #include "eui64.h"
 #endif
 
+#ifndef IFNAMSIZ
+#define IFNAMSIZ	16
+#endif
+
 /*
  * Limits.
  */
@@ -308,6 +312,7 @@ extern char	*record_file;	/* File to rec
 extern bool	sync_serial;	/* Device is synchronous serial device */
 extern int	maxfail;	/* Max # of unsuccessful connection attempts */
 extern char	linkname[MAXPATHLEN]; /* logical name for link */
+extern char	use_ifname[IFNAMSIZ]; /* physical name for PPP interface */
 extern bool	tune_kernel;	/* May alter kernel settings as necessary */
 extern int	connect_delay;	/* Time to delay after connect script */
 extern int	max_data_rate;	/* max bytes/sec through charshunt */
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
@@ -168,6 +168,10 @@ struct in6_ifreq {
 /* We can get an EIO error on an ioctl if the modem has hung up */
 #define ok_error(num) ((num)==EIO)
 
+#if !defined(PPP_DRV_NAME)
+#define PPP_DRV_NAME	"ppp"
+#endif /* !defined(PPP_DRV_NAME) */
+
 static int tty_disc = N_TTY;	/* The TTY discipline */
 static int ppp_disc = N_PPP;	/* The PPP discpline */
 static int initfdflags = -1;	/* Initial file descriptor flags for fd */
@@ -622,7 +626,8 @@ void generic_disestablish_ppp(int dev_fd
  */
 static int make_ppp_unit()
 {
-	int x, flags;
+	struct ifreq ifr;
+	int x, flags, s;
 
 	if (ppp_dev_fd >= 0) {
 		dbglog("in make_ppp_unit, already had /dev/ppp open?");
@@ -645,6 +650,30 @@ static int make_ppp_unit()
 	}
 	if (x < 0)
 		error("Couldn't create new ppp unit: %m");
+
+	if (use_ifname[0] != 0) {
+		s = socket(PF_INET, SOCK_DGRAM, 0);
+		if (s < 0)
+			s = socket(PF_PACKET, SOCK_DGRAM, 0);
+		if (s < 0)
+			s = socket(PF_INET6, SOCK_DGRAM, 0);
+		if (s < 0)
+			s = socket(PF_UNIX, SOCK_DGRAM, 0);
+		if (s >= 0) {
+			slprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", PPP_DRV_NAME, ifunit);
+			slprintf(ifr.ifr_newname, sizeof(ifr.ifr_newname), "%s", use_ifname);
+			x = ioctl(s, SIOCSIFNAME, &ifr);
+			close(s);
+		} else {
+			x = s;
+		}
+		if (x < 0) {
+			error("Couldn't rename %s to %s", ifr.ifr_name, ifr.ifr_newname);
+			close(ppp_dev_fd);
+			ppp_dev_fd = -1;
+		}
+	}
+
 	return x;
 }
 
--- a/pppstats/pppstats.c
+++ b/pppstats/pppstats.c
@@ -506,10 +506,12 @@ main(argc, argv)
     if (argc > 0)
 	interface = argv[0];
 
+/*
     if (sscanf(interface, PPP_DRV_NAME "%d", &unit) != 1) {
 	fprintf(stderr, "%s: invalid interface '%s' specified\n",
 		progname, interface);
     }
+*/
 
 #ifndef STREAMS
     {