raw: raw sockets

kernel-src/include/kernel/raw.h

@@ -0,0 +1,7 @@
+#ifndef _RAW_H
+#define _RAW_H
+
+void raw_process(netdev_t *netdev, void *buffer, uint32_t peer);
+socket_t *raw_create_socket(void);
+
+#endif

kernel-src/include/kernel/sock.h

@@ -92,6 +92,7 @@ typedef struct {
 #define SOCKET_TYPE_LOCAL 1
 #define SOCKET_TYPE_TCP 2
 #define SOCKET_TYPE_LOCAL_SEQPACKET 3
+#define SOCKET_TYPE_RAW_STRIPPED 4
 #define SOCKFS_SOCKET_FROM_NODE(nodep) (((socketnode_t *)(nodep))->socket)
 
 static inline int sockfd_get(int fd, vnode_t **vnodep, int *fileflags) {

kernel-src/io/net/raw.c

@@ -0,0 +1,143 @@
+#include <kernel/net.h>
+#include <arch/cpu.h>
+#include <logging.h>
+#include <kernel/sock.h>
+#include <kernel/alloc.h>
+#include <spinlock.h>
+#include <kernel/interrupt.h>
+#include <ringbuffer.h>
+#include <kernel/auth.h>
+#include <list.h>
+
+#define SOCKET_BUFFER (16 * 1024)
+
+// TODO: check user creating socket is root
+
+SPINLOCK_DEFINE(list_lock);
+static list_t socket_list;
+
+typedef struct {
+	uint8_t sender[6];
+	uint16_t size;
+} packet_header_t;
+
+typedef struct {
+	socket_t socket;
+	ringbuffer_t ringbuffer;
+	list_node_t list_node;
+	netdev_t *netdev_binding;
+} raw_socket_t;
+
+// expectd to be called at IPL_DPC
+void raw_process(netdev_t *netdev, void *buffer, mac_t *sender, uint16_t proto, size_t size) {
+	spinlock_acquire(&list_lock);
+
+	list_for_each (&socket_list, node) {
+		raw_socket_t *socket = container_of(node, raw_socket_t, list_node);
+		if (socket->netdev_binding && socket->netdev_binding != netdev)
+			continue;
+
+		if (RINGBUFFER_FREESPACE(&socket->ringbuffer) < size + sizeof(packet_header_t))
+			continue;
+
+		packet_header_t header;
+		memcpy(header.sender, sender, 6);
+		header.size = size;
+
+		ringbuffer_write(&socket->ringbuffer, &header, sizeof(header));
+		ringbuffer_write(&socket->ringbuffer, buffer, size);
+	}
+
+	spinlock_release(&list_lock);
+}
+
+static int raw_bind(socket_t *socket, sockaddr_t *addr, cred_t *cred) {
+	
+}
+
+static int internalpoll(socket_t *socket, polldata_t *data, int events) {
+
+}
+
+static int raw_send(socket_t *socket, sockdesc_t *sockdesc) {
+
+}
+
+static int raw_recv(socket_t *socket, sockdesc_t *sockdesc) {
+
+}
+
+static int raw_getname(socket_t *socket, sockaddr_t *addr) {
+	raw_socket_t *raw_socket = (raw_socket_t *)socket;
+	return 0;
+}
+
+static int raw_getpeername(socket_t *socket, sockaddr_t *addr) {
+	return EINVAL;
+}
+
+static int raw_poll(socket_t *socket, polldata_t *data, int events) {
+	int revents = 0;
+	MUTEX_ACQUIRE(&socket->mutex);
+
+	revents = internalpoll(socket, data, events);
+
+	MUTEX_RELEASE(&socket->mutex);
+	return revents;
+}
+
+static int raw_shutdown(socket_t *socket, int how) {
+	if (how > SOCKET_SHUTDOWN_RW)
+		return EINVAL;
+
+	MUTEX_ACQUIRE(&socket->mutex);
+
+	socket->shutdown |= how;
+
+	MUTEX_RELEASE(&socket->mutex);
+	return 0;
+}
+
+static int raw_connect(socket_t *socket, sockaddr_t *addr, uintmax_t flags, cred_t *cred) {
+	return EINVAL;
+}
+
+static void raw_destroy(socket_t *handle) {
+	raw_socket_t *socket = (raw_socket_t *)handle;
+	long ipl = spinlock_acquire_raise_ipl(&list_lock, IPL_DPC);
+	list_remove(&socket_list, &socket->list_node);
+	spinlock_release_lower_ipl(&list_lock, ipl);
+	free(socket);
+}
+
+static socketops_t socketops = {
+	.bind = raw_bind,
+	.send = raw_send,
+	.recv = raw_recv,
+	.destroy = raw_destroy,
+	.poll = raw_poll,
+	.getname = raw_getname,
+	.getpeername = raw_getpeername,
+	.shutdown = raw_shutdown,
+	.connect = raw_connect
+};
+
+socket_t *raw_create_socket(void) {
+	// XXX possibly move this to a slab?
+	raw_socket_t *socket = alloc(sizeof(raw_socket_t));
+	if (socket == NULL)
+		return NULL;
+
+	if (ringbuffer_init(&socket->ringbuffer, SOCKET_BUFFER)) {
+		free(socket);
+		return NULL;
+	}
+
+	socket->socket.ops = &socketops;
+
+	long ipl = spinlock_acquire_raise_ipl(&list_lock, IPL_DPC);
+	list_push_front(&socket_list, &socket->list_node);
+	spinlock_release_lower_ipl(&list_lock, ipl);
+
+	return (socket_t *)socket;
+}

kernel-src/io/net/socket.c

@@ -1,11 +1,13 @@
 #include <kernel/sock.h>
+#include <kernel/raw.h>
 #include <logging.h>
 
 static socket_t *(*createsocket[])() = {
 	udp_createsocket,
 	localsock_createsocket,
 	tcp_createsocket,
-	localsock_create_seqpacket_socket
+	localsock_create_seqpacket_socket,
+	raw_create_socket
 };
 
 socket_t *socket_create(int type) {