Allow to force TFTP to use a fixed UDP port
(Add a configuration option CONFIG_TFTP_PORT and optional env variable tftpport)
Patch by Jerry Van Baren, 10 Jan 2005
diff --git a/CHANGELOG b/CHANGELOG
index 1ed2fb7..bc194ff 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,11 @@
Changes for U-Boot 1.1.4:
======================================================================
+* Allow to force TFTP to use a fixed UDP port
+ (Add a configuration option CONFIG_TFTP_PORT and optional env
+ variable tftpport)
+ Patch by Jerry Van Baren, 10 Jan 2005
+
* Fix ethernet timeouts on dbau1550 and other au1x00 systems
Patch by Leif Lindholm, 29 Dec 2004
diff --git a/README b/README
index e3d0537..3b36e50 100644
--- a/README
+++ b/README
@@ -1487,6 +1487,22 @@
When SystemACE support is added, the "ace" device type
becomes available to the fat commands, i.e. fatls.
+- TFTP Fixed UDP Port:
+ CONFIG_TFTP_PORT
+
+ If this is defined, the environment variable tftpport
+ is used to supply the TFTP UDP source port value.
+ If tftpport isn't defined, the normal pseudo-random port
+ number generator is used.
+
+ The purpose for this is to allow a TFTP server to
+ blindly start the TFTP transfer using the pre-configured
+ target IP address and UDP port. This has the effect of
+ "punching through" the (Windows XP) firewall, allowing
+ the remainder of the TFTP transfer to proceed normally.
+ A better solution is to properly configure the firewall,
+ but sometimes that is not allowed.
+
- Show boot progress:
CONFIG_SHOW_BOOT_PROGRESS
@@ -2452,6 +2468,9 @@
Useful on scripts which control the retry operation
themselves.
+ tftpport - If this is set, the value is used for TFTP's
+ UDP source port.
+
vlan - When set to a value < 4095 the traffic over
ethernet is encapsulated/received over 802.1q
VLAN tagged frames.
diff --git a/net/tftp.c b/net/tftp.c
index 03a0027..a7c246a 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -313,6 +313,10 @@
void
TftpStart (void)
{
+#ifdef CONFIG_TFTP_PORT
+ char *ep; /* Environment pointer */
+#endif
+
if (BootFile[0] == '\0') {
sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
NetOurIP & 0xFF,
@@ -364,7 +368,13 @@
TftpServerPort = WELL_KNOWN_PORT;
TftpTimeoutCount = 0;
TftpState = STATE_RRQ;
+ /* Use a pseudo-random port unless a specific port is set */
TftpOurPort = 1024 + (get_timer(0) % 3072);
+#ifdef CONFIG_TFTP_PORT
+ if ((ep = getenv("tftpport")) != NULL) {
+ TftpOurPort= simple_strtol(ep, NULL, 10);
+ }
+#endif
TftpBlock = 0;
/* zero out server ether in case the server ip has changed */