linux-atm: add br2684ctl option to specify the netdev name

Add the uci option nameprefix to specifc a target netdev name. Patch the
br2684ctl code to accept and set a netdev name via commandline parameters.

It allows to use the same netdev name for ATM and PTM lines on lantiq
xdsl hardware.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: Mathis Kresin <dev@kresin.me>

package/base-files/files/bin/config_generate

@@ -24,8 +24,8 @@ generate_static_network() {
 		json_select dsl
 			if json_is_a atmbridge object; then
 				json_select atmbridge
-					local vpi vci encaps payload
+					local vpi vci encaps payload nameprefix
-					json_get_vars vpi vci encaps payload
+					json_get_vars vpi vci encaps payload nameprefix
 					uci -q batch <<-EOF
 						delete network.atm
 						set network.atm='atm-bridge'
@@ -33,6 +33,7 @@ generate_static_network() {
 						set network.atm.vci='$vci'
 						set network.atm.encaps='$encaps'
 						set network.atm.payload='$payload'
+						set network.atm.nameprefix='$nameprefix'
 					EOF
 				json_select ..
 			fi

package/base-files/files/lib/functions/uci-defaults.sh

@@ -319,6 +319,7 @@ ucidef_add_atm_bridge() {
 	local vci="$2"
 	local encaps="$3"
 	local payload="$4"
+	local nameprefix="$5"
 
 	json_select_object dsl
 		json_select_object atmbridge
@@ -326,6 +327,7 @@ ucidef_add_atm_bridge() {
 			json_add_int vci "$vci"
 			json_add_string encaps "$encaps"
 			json_add_string payload "$payload"
+			json_add_string nameprefix "$nameprefix"
 		json_select ..
 	json_select ..
 }

package/network/utils/linux-atm/files/br2684ctl

@@ -13,6 +13,9 @@ start_daemon() {
 
 	config_get atmdev "$cfg" atmdev 0
 
+	local nameprefix
+	config_get nameprefix "$cfg" nameprefix "nas"
+
 	local unit
 	config_get unit "$cfg" unit 0
 
@@ -58,8 +61,8 @@ start_daemon() {
 
 	procd_open_instance
 	procd_set_param command \
-		/usr/sbin/br2684ctl_wrap "nas$unit" \
+		/usr/sbin/br2684ctl_wrap "${nameprefix}${unit}" \
-		-c "$unit" -e "$encaps" -p "$payload" \
+		-n "$nameprefix" -c "$unit" -e "$encaps" -p "$payload" \
 		-a "$circuit" ${qos:+-q "$qos"} ${sendsize:+-s "$sendsize"} \
 		-S /lib/netifd/br2684-up
 	procd_close_instance

package/network/utils/linux-atm/patches/501-br2684ctl_itfname.patch

@@ -0,0 +1,74 @@
+--- a/src/br2684/br2684ctl.c
++++ b/src/br2684/br2684ctl.c
+@@ -45,6 +45,7 @@ struct br2684_params {
+ 
+ int lastsock, lastitf;
+ static char *up_script;
++const char *itfname = "nas";
+ 
+ 
+ void fatal(const char *str, int err)
+@@ -73,7 +74,7 @@ int create_pidfile(int num)
+ 
+   if (num < 0) return -1;
+ 
+-  snprintf(name, 32, "/var/run/br2684ctl-nas%d.pid", num);
++  snprintf(name, 32, "/var/run/br2684ctl-%s%d.pid", itfname, num);
+   pidfile = fopen(name, "w");
+   if (pidfile == NULL) return -1;
+   fprintf(pidfile, "%d", getpid());
+@@ -102,7 +103,7 @@ int create_br(int itfnum, int payload)
+         ni.media |= BR2684_FLAG_ROUTED;
+ #endif
+       ni.mtu = 1500;
+-      sprintf(ni.ifname, "nas%d", itfnum);
++      sprintf(ni.ifname, "%s%d", itfname, itfnum);
+       err=ioctl (lastsock, ATM_NEWBACKENDIF, &ni);
+   
+       if (err == 0)
+@@ -167,7 +168,7 @@ int assign_vcc(char *astr, int encap, in
+     
+     be.backend_num = ATM_BACKEND_BR2684;
+     be.ifspec.method = BR2684_FIND_BYIFNAME;
+-    sprintf(be.ifspec.spec.ifname, "nas%d", lastitf);
++    sprintf(be.ifspec.spec.ifname, "%s%d", itfname, lastitf);
+     be.fcs_in = BR2684_FCSIN_NO;
+     be.fcs_out = BR2684_FCSOUT_NO;
+     be.fcs_auto = 0;
+@@ -198,7 +199,7 @@ void start_interface(struct br2684_param
+   assign_vcc(params->astr, params->encap, params->payload, params->sndbuf,
+ 	     params->reqqos);
+   if (up_script) {
+-    asprintf(&cmd, "%s nas%d", up_script, lastitf);
++    asprintf(&cmd, "%s %s%d", up_script, itfname, lastitf);
+     system(cmd);
+     free(cmd);
+   }
+@@ -207,7 +208,7 @@ void start_interface(struct br2684_param
+ 
+ void usage(char *s)
+ {
+-  printf("usage: %s [-b] [[-c number] [-e 0|1] [-s sndbuf] [-q qos] [-p 0|1] "
++  printf("usage: %s [-b] [-n name] [[-c number] [-e 0|1] [-s sndbuf] [-q qos] [-p 0|1] "
+ 	 "[-a [itf.]vpi.vci]*]* [-S script]\n", s);
+   printf("  encapsulations: 0=llc, 1=vcmux\n  payloads: 0=routed, 1=bridged\n");
+   exit(1);
+@@ -234,7 +235,7 @@ int main (int argc, char **argv)
+ 
+   openlog (LOG_NAME,LOG_OPTION,LOG_FACILITY);
+   if (argc>1)
+-    while ((c = getopt(argc, argv,"q:a:bc:e:s:S:p:?h")) !=EOF)
++    while ((c = getopt(argc, argv,"q:a:bn:c:e:s:S:p:?h")) !=EOF)
+       switch (c) {
+       case 'q':
+ 	printf ("optarg : %s",optarg);
+@@ -247,6 +248,9 @@ int main (int argc, char **argv)
+       case 'b':
+ 	background=1;
+ 	break;
++      case 'n':
++	itfname = optarg;
++	break;
+       case 'c':
+ 	/* temporary, to make it work with multiple interfaces: */
+ 	if (params.itfnum>=0) start_interface(&params);