[U-Boot] [RFC PATCH v3 05/11] net: IPv6 skeleton and environment variables

[Chris Packham]

Create net6.c and add CONFIG_NET6 to Kconfig/Makefile. Also add
support for the following environment variables:
 - ip6addr
 - gateway6
 - serverip6

Signed-off-by: Chris Packham <judge.packham at gmail.com>
---

Changes in v3: None
Changes in v2:
- Split environment variables from main implementation
- remove "prefixlength6" environment variable. The prefix length is now
  set when specifying the address i.e. setenv ip6addr 2001:db8::1/64.

 include/env_callback.h |  8 +++++
 include/env_flags.h    |  9 +++++
 net/Kconfig            |  6 +++-
 net/Makefile           |  1 +
 net/net6.c             | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 112 insertions(+), 1 deletion(-)
 create mode 100644 net/net6.c

diff --git a/include/env_callback.h b/include/env_callback.h
index 90b95b5e6676..97e245bff09d 100644
--- a/include/env_callback.h
+++ b/include/env_callback.h
@@ -60,6 +60,13 @@
 #define NET_CALLBACKS
 #endif
 
+#ifdef CONFIG_NET6
+#define NET6_CALLBACKS \
+	"ip6addr:ip6addr," \
+	"serverip6:serverip6,"
+#else
+#define NET6_CALLBACKS
+#endif
 /*
  * This list of callback bindings is static, but may be overridden by defining
  * a new association in the ".callbacks" environment variable.
@@ -68,6 +75,7 @@
 	ENV_DOT_ESCAPE ENV_FLAGS_VAR ":flags," \
 	"baudrate:baudrate," \
 	NET_CALLBACKS \
+	NET6_CALLBACKS \
 	"loadaddr:loadaddr," \
 	SILENT_CALLBACK \
 	SPLASHIMAGE_CALLBACK \
diff --git a/include/env_flags.h b/include/env_flags.h
index 0dcec0689b19..916e4bec394f 100644
--- a/include/env_flags.h
+++ b/include/env_flags.h
@@ -65,6 +65,14 @@ enum env_flags_varaccess {
 #define NET_FLAGS
 #endif
 
+#ifdef CONFIG_NET6
+#define NET6_FLAGS \
+	"ip6addr:s," \
+	"serverip6:s,"
+#else
+#define NET6_FLAGS
+#endif
+
 #ifndef CONFIG_ENV_OVERWRITE
 #define SERIAL_FLAGS "serial#:so,"
 #else
@@ -74,6 +82,7 @@ enum env_flags_varaccess {
 #define ENV_FLAGS_LIST_STATIC \
 	ETHADDR_FLAGS \
 	NET_FLAGS \
+	NET6_FLAGS \
 	SERIAL_FLAGS \
 	CONFIG_ENV_FLAGS_LIST_STATIC
 
diff --git a/net/Kconfig b/net/Kconfig
index 414c5497c758..bc70cc59defd 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -32,6 +32,11 @@ config NET_TFTP_VARS
 	  If unset, timeout and maximum are hard-defined as 1 second
 	  and 10 timouts per TFTP transfer.
 
+config NET6
+	bool "IPv6 support"
+	help
+	  Support for IPv6
+
 config BOOTP_PXE_CLIENTARCH
 	hex
         default 0x16 if ARM64
@@ -44,5 +49,4 @@ config BOOTP_VCI_STRING
 	default "U-Boot.armv8" if ARM64
 	default "U-Boot.arm" if ARM
 	default "U-Boot"
-
 endif   # if NET
diff --git a/net/Makefile b/net/Makefile
index f03d6083268f..b5e8c5c758c9 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -25,3 +25,4 @@ obj-$(CONFIG_CMD_PING) += ping.o
 obj-$(CONFIG_CMD_RARP) += rarp.o
 obj-$(CONFIG_CMD_SNTP) += sntp.o
 obj-$(CONFIG_CMD_NET)  += tftp.o
+obj-$(CONFIG_NET6)     += net6.o
diff --git a/net/net6.c b/net/net6.c
new file mode 100644
index 000000000000..f778cef5ada9
--- /dev/null
+++ b/net/net6.c
@@ -0,0 +1,89 @@
+/*
+ * Simple IPv6 network layer implementation.
+ *
+ * Based and/or adapted from the IPv4 network layer in net.[hc]
+ *
+ * (C) Copyright 2013 Allied Telesis Labs NZ
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <environment.h>
+#include <malloc.h>
+#include <net.h>
+#include <net6.h>
+#include "ndisc.h"
+
+/* Our gateway's IPv6 address */
+struct in6_addr net_gateway6 = ZERO_IPV6_ADDR;
+/* Our IPv6 addr (0 = unknown) */
+struct in6_addr net_ip6 = ZERO_IPV6_ADDR;
+/* set server IPv6 addr (0 = unknown) */
+struct in6_addr net_server_ip6 = ZERO_IPV6_ADDR;
+/* The prefix length of our network */
+u_int32_t net_prefix_length;
+
+static int on_ip6addr(const char *name, const char *value, enum env_op op,
+		      int flags)
+{
+	char *v, *s, *strcopy;
+	int i;
+
+	if (flags & H_PROGRAMMATIC)
+		return 0;
+
+	if (op == env_op_delete) {
+		net_prefix_length = 0;
+		net_copy_ip6(&net_ip6, &net_null_addr_ip6);
+		return 0;
+	}
+
+	strcopy = strdup(value);
+	if (strcopy == NULL)
+		return -1;
+
+	net_prefix_length = 128;
+	i = 0;
+	s = strcopy;
+	while (s) {
+		v = strsep(&s, "/");
+		if (!v)
+			break;
+
+		switch (i++) {
+		case 0:
+			string_to_ip6(v, &net_ip6);
+			break;
+		case 1:
+			net_prefix_length = simple_strtoul(v, NULL, 10);
+			break;
+		default:
+			break;
+		}
+	}
+	free(strcopy);
+
+	return 0;
+}
+U_BOOT_ENV_CALLBACK(ip6addr, on_ip6addr);
+
+static int on_gatewayip6(const char *name, const char *value, enum env_op op,
+			 int flags)
+{
+	if (flags & H_PROGRAMMATIC)
+		return 0;
+
+	return string_to_ip6(value, &net_gateway6);
+}
+U_BOOT_ENV_CALLBACK(gatewayip6, on_gatewayip6);
+
+static int on_serverip6(const char *name, const char *value, enum env_op op,
+			int flags)
+{
+	if (flags & H_PROGRAMMATIC)
+		return 0;
+
+	return string_to_ip6(value, &net_server_ip6);
+}
+U_BOOT_ENV_CALLBACK(serverip6, on_serverip6);
-- 
2.11.0.24.ge6920cf