[PATCH 1/2] Add vlan information to net_ls_addr output

[Chad Kimes <chkimes@github.com>]

Example output:
  grub> net_ls_addr
  efinet1 00:11:22:33:44:55 192.0.2.100 vlan100

Signed-off-by: Chad Kimes <chkimes@github.com>
---
 grub-core/net/net.c | 19 ++++++++++++++++++-
 include/grub/net.h  |  6 ++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/grub-core/net/net.c b/grub-core/net/net.c
index 4d3eb5c1a..b957b30e4 100644
--- a/grub-core/net/net.c
+++ b/grub-core/net/net.c
@@ -781,6 +781,20 @@ grub_net_hwaddr_to_str (const grub_net_link_level_address_t *addr, char *str)
   grub_printf (_("Unsupported hw address type %d\n"), addr->type);
 }
 
+void
+grub_net_vlan_to_str (grub_uint16_t vlantag, char *str)
+{
+  str[0] = 0;
+
+  /* 12 bits are used to identify the vlan in 802.1Q */
+  vlantag = vlantag & 0xFFF;
+
+  if (vlantag == 0)
+    return;
+
+  grub_snprintf (str, GRUB_NET_MAX_STR_VLAN_LEN, "vlan%u", vlantag);
+}
+
 int
 grub_net_hwaddr_cmp (const grub_net_link_level_address_t *a,
 		     const grub_net_link_level_address_t *b)
@@ -1250,9 +1264,12 @@ grub_cmd_listaddrs (struct grub_command *cmd __attribute__ ((unused)),
   {
     char bufh[GRUB_NET_MAX_STR_HWADDR_LEN];
     char bufn[GRUB_NET_MAX_STR_ADDR_LEN];
+    char bufv[GRUB_NET_MAX_STR_VLAN_LEN];
+
     grub_net_hwaddr_to_str (&inf->hwaddress, bufh);
     grub_net_addr_to_str (&inf->address, bufn);
-    grub_printf ("%s %s %s\n", inf->name, bufh, bufn);
+    grub_net_vlan_to_str (inf->vlantag, bufv);
+    grub_printf ("%s %s %s %s\n", inf->name, bufh, bufn, bufv);
   }
   return GRUB_ERR_NONE;
 }
diff --git a/include/grub/net.h b/include/grub/net.h
index 7ae4b6bd8..b2d044ceb 100644
--- a/include/grub/net.h
+++ b/include/grub/net.h
@@ -512,12 +512,18 @@ grub_net_addr_cmp (const grub_net_network_level_address_t *a,
 
 #define GRUB_NET_MAX_STR_HWADDR_LEN (sizeof ("XX:XX:XX:XX:XX:XX"))
 
+/* Max VLAN id = 4094 */
+#define GRUB_NET_MAX_STR_VLAN_LEN (sizeof ("vlanXXXX"))
+
 void
 grub_net_addr_to_str (const grub_net_network_level_address_t *target,
 		      char *buf);
 void
 grub_net_hwaddr_to_str (const grub_net_link_level_address_t *addr, char *str);
 
+void
+grub_net_vlan_to_str (grub_uint16_t vlantag, char *str);
+
 grub_err_t
 grub_env_set_net_property (const char *intername, const char *suffix,
                            const char *value, grub_size_t len);
-- 
2.25.1