kernel: rtl: Expose NIC properly through if_var.h

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 85 insertions, 0 deletions

diff --git a/sys/net/if.c b/sys/net/if.c
new file mode 100644
index 0000000..5c9bc01
--- /dev/null
+++ b/sys/net/if.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/spinlock.h>
+#include <sys/errno.h>
+#include <net/if_var.h>
+#include <string.h>
+
+static TAILQ_HEAD(, netif) netif_list;
+static bool netif_init = false;
+
+/*
+ * Expose a network interface to the rest of the
+ * system.
+ */
+void
+netif_add(struct netif *nifp)
+{
+    if (!netif_init) {
+        TAILQ_INIT(&netif_list);
+        netif_init = true;
+    }
+
+    TAILQ_INSERT_TAIL(&netif_list, nifp, link);
+}
+
+/*
+ * Lookup a network interface by name or type.
+ *
+ * @name: Name to lookup (use `type' if NULL)
+ * @type: Type to lookup (use if `name' is NULL)
+ */
+int
+netif_lookup(const char *name, uint8_t type, struct netif **res)
+{
+    struct netif *netif;
+
+    if (!netif_init) {
+        return -EAGAIN;
+    }
+
+    TAILQ_FOREACH(netif, &netif_list, link) {
+        if (name != NULL) {
+            if (strcmp(netif->name, name) == 0) {
+                *res = netif;
+                return 0;
+            }
+        }
+
+        if (name == NULL && netif->type == type) {
+            *res = netif;
+            return 0;
+        }
+    }
+
+    return -ENODEV;
+}