kernel: net: Introduce initial socket impl

Introduce initial support for POSIX sockets. This commit currently
implements the AF_UNIX family for IPC.

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

3 files changed, 146 insertions, 0 deletions

diff --git a/sys/include/sys/socket.h b/sys/include/sys/socket.h
new file mode 100644
index 0000000..7175da5
--- /dev/null
+++ b/sys/include/sys/socket.h
@@ -0,0 +1,92 @@
+/*
+ * 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.
+ */
+
+#ifndef _SYS_SOCKET_H_
+#define _SYS_SOCKET_H_
+
+#include <sys/socketvar.h>
+#if defined(_KERNEL)
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/mutex.h>
+#else
+#include <stdint.h>
+#include <stddef.h>
+#endif  /* _KERNEL */
+
+#ifndef _SA_FAMILY_T_DEFINED_
+#define _SA_FAMILY_T_DEFINED_
+typedef uint32_t sa_family_t;
+#endif  /* _SA_FAMILY_T_DEFINED_ */
+
+#ifndef _SOCKLEN_T_DEFINED_
+#define _SOCKLEN_T_DEFINED_
+typedef uint32_t socklen_t;
+#endif  /* !_SOCKLEN_T_DEFINED_ */
+
+/*
+ * Address family defines
+ */
+#define AF_UNSPEC 0
+#define AF_UNIX   1
+#define AF_LOCAL  AF_UNIX
+
+/* Socket types */
+#define SOCK_STREAM 1
+
+struct sockaddr_un {
+    sa_family_t sun_family;
+    char sun_path[108];
+};
+
+struct sockaddr {
+    sa_family_t sa_family;
+    char sa_data[14];
+};
+
+#if defined(_KERNEL)
+
+struct ksocket {
+    int sockfd;
+    union {
+        struct sockaddr sockaddr;
+        struct sockaddr_un un;
+    };
+    struct sockbuf buf;
+    struct mutex *mtx;
+};
+#endif  /* _KERNEL */
+
+int socket(int domain, int type, int protocol);
+int bind(int sockfd, const struct sockaddr *addr, socklen_t len);
+
+ssize_t send(int sockfd, const void *buf, size_t size, int flags);
+ssize_t recv(int sockfd, void *buf, size_t len, int flags);
+
+#endif  /* !_SYS_SOCKET_H_ */
diff --git a/sys/include/sys/socketvar.h b/sys/include/sys/socketvar.h
new file mode 100644
index 0000000..e090a70
--- /dev/null
+++ b/sys/include/sys/socketvar.h
@@ -0,0 +1,53 @@
+/*
+ * 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.
+ */
+
+#ifndef _SYS_SOCKETVAR_H_
+#define _SYS_SOCKETVAR_H_
+
+#include <sys/types.h>
+#if defined(_KERNEL)
+#include <net/netbuf.h>
+
+/*
+ * Socket buffer
+ *
+ * @buf: Actual data buffer
+ * @head: Buffer head
+ * @tail: Buffer tail
+ * @watermark: Max length
+ */
+struct sockbuf {
+    struct netbuf buf;
+    size_t head;
+    size_t tail;
+    size_t watermark;
+};
+
+#endif  /* _KERNEL */
+#endif  /* !_SYS_SOCKETVAR_H_ */
diff --git a/sys/include/sys/vnode.h b/sys/include/sys/vnode.h
index 3402b02..ff6f995 100644
--- a/sys/include/sys/vnode.h
+++ b/sys/include/sys/vnode.h
@@ -76,6 +76,7 @@ struct vcache {
 #define VDIR    0x02    /* Directory */
 #define VCHR    0x03    /* Character device */
 #define VBLK    0x04    /* Block device */
+#define VSOCK   0x05    /* Socket */
 
 #define VNOVAL -1