netpoll: add IPv6 support

Currently, netpoll only supports IPv4. This patch adds IPv6
support to netpoll so that we can run netconsole over IPv6 network.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 6 deletions

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 998fa0257a92..37add21a3d7d 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -269,13 +269,17 @@ static ssize_t show_remote_port(struct netconsole_target *nt, char *buf)
 
 static ssize_t show_local_ip(struct netconsole_target *nt, char *buf)
 {
-        if (!nt->np.ipv6)
+        if (nt->np.ipv6)
+                return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6);
+        else
                 return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip);
 }
 
 static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf)
 {
-        if (!nt->np.ipv6)
+        if (nt->np.ipv6)
+                return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6);
+        else
                 return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip);
 }
 
@@ -412,8 +416,22 @@ static ssize_t store_local_ip(struct netconsole_target *nt,
                 return -EINVAL;
         }
 
-        if (!strnchr(buf, count, ':'))
-                nt->np.local_ip.ip = in_aton(buf);
+        if (strnchr(buf, count, ':')) {
+                const char *end;
+                if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) {
+                        if (*end && *end != '\n') {
+                                printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end);
+                                return -EINVAL;
+                        }
+                        nt->np.ipv6 = true;
+                } else
+                        return -EINVAL;
+        } else {
+                if (!nt->np.ipv6) {
+                        nt->np.local_ip.ip = in_aton(buf);
+                } else
+                        return -EINVAL;
+        }
 
         return strnlen(buf, count);
 }
@@ -429,8 +447,22 @@ static ssize_t store_remote_ip(struct netconsole_target *nt,
                 return -EINVAL;
         }
 
-        if (!strnchr(buf, count, ':'))
-                nt->np.remote_ip.ip = in_aton(buf);
+        if (strnchr(buf, count, ':')) {
+                const char *end;
+                if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) {
+                        if (*end && *end != '\n') {
+                                printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end);
+                                return -EINVAL;
+                        }
+                        nt->np.ipv6 = true;
+                } else
+                        return -EINVAL;
+        } else {
+                if (!nt->np.ipv6) {
+                        nt->np.remote_ip.ip = in_aton(buf);
+                } else
+                        return -EINVAL;
+        }
 
         return strnlen(buf, count);
 }