From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001
From: James <>
Date: Wed, 4 Nov 2015 11:49:21 +0000
Subject: trunk-47381

---
 .../ppp/patches/320-custom_iface_names.patch       | 135 +++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 package/network/services/ppp/patches/320-custom_iface_names.patch

(limited to 'package/network/services/ppp/patches/320-custom_iface_names.patch')

diff --git a/package/network/services/ppp/patches/320-custom_iface_names.patch b/package/network/services/ppp/patches/320-custom_iface_names.patch
new file mode 100644
index 0000000..ccda0c6
--- /dev/null
+++ b/package/network/services/ppp/patches/320-custom_iface_names.patch
@@ -0,0 +1,135 @@
+pppd: Support arbitrary interface names
+
+This patch implements a new string option "ifname" which allows to specify
+fully custom PPP interface names on Linux. It does so by renaming the
+allocated pppX device immediately after it has been created to the requested
+interface name.
+
+Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
+
+--- a/pppd/main.c
++++ b/pppd/main.c
+@@ -745,8 +745,11 @@ 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
+@@ -112,6 +112,7 @@ 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 */
+@@ -277,6 +278,9 @@ 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
+@@ -74,6 +74,10 @@
+ #include "eui64.h"
+ #endif
+ 
++#ifndef IFNAMSIZ
++#define IFNAMSIZ	16
++#endif
++
+ /*
+  * Limits.
+  */
+@@ -317,6 +321,7 @@ 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
+@@ -161,6 +161,10 @@ 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 */
+@@ -620,7 +624,8 @@ 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?");
+@@ -643,6 +648,30 @@ 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 0
+     if (sscanf(interface, PPP_DRV_NAME "%d", &unit) != 1) {
+ 	fprintf(stderr, "%s: invalid interface '%s' specified\n",
+ 		progname, interface);
+     }
++#endif
+ 
+ #ifndef STREAMS
+     {
-- 
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