--- /dev/null
+#include <linux/module.h>
+#include <net/sock.h>
+#include <net/protocol.h>
+#include <net/ip.h>
+#include <net/route.h>
+
+#include "swift.h"
+
+MODULE_DESCRIPTION("Swift Transport Protocol");
+MODULE_AUTHOR("Adrian Bondrescu/Cornel Mercan");
+MODULE_LICENSE("GPL");
+
+struct swift_sock {
+ struct inet_sock sock;
+ /* swift socket speciffic data */
+ __be16 src;
+ __be16 dst;
+ __be16 len;
+};
+
+static struct swift_sock * sock_port_map[MAX_SWIFT_PORT];
+
+static inline struct swift_sock * swift_sk(struct sock * sock)
+{
+ return (struct swift_sock *)(sock);
+}
+
+static inline struct swifthdr * swift_hdr(const struct sk_buff * skb)
+{
+ return (struct swifthdr *) skb_transport_header(skb);
+}
+
+static inline __be16 get_next_free_port(void)
+{
+ int i;
+ for (i = MIN_SWIFT_PORT; i < MAX_SWIFT_PORT; i ++)
+ if (sock_port_map[i] == NULL)
+ return i;
+ return 0;
+}
+
+static inline void swift_unhash(__be16 port)
+{
+ sock_port_map[port] = NULL;
+}
+
+static inline void swift_hash(__be16 port, struct swift_sock *ssh)
+{
+ sock_port_map[port] = ssh;
+}
+
+static inline struct swift_sock * swift_lookup(__be16 port)
+{
+ return sock_port_map[port];
+}
+
+static int swift_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ struct swift_sock * ssk = swift_sk(sk);
+
+ if (!sk)
+ return 0;
+
+ swift_unhash(ssk->src);
+
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+
+ synchronize_net();
+
+ sock_orphan(sk);
+ sock->sk = NULL;
+
+ skb_queue_purge(&sk->sk_receive_queue);
+
+ printk(KERN_DEBUG "swift_release sock=%p\n", sk);
+ sock_put(sk);
+
+ return 0;
+}
+
+static int swift_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
+{
+ struct sockaddr_swift *swift_addr;
+ struct swift_sock *ssk;
+ int err;
+ __be16 port;
+
+ err = -EINVAL;
+ if (addr_len < sizeof(struct sockaddr_swift)) {
+ printk(KERN_ERR "Invalid size for sockaddr\n");
+ goto out;
+ }
+
+ swift_addr = (struct sockaddr_swift *) addr;
+
+ err = -EINVAL;
+ if (swift_addr->sin_family != AF_INET) {
+ printk(KERN_ERR "Invalid family for sockaddr\n");
+ goto out;
+ }
+
+ port = ntohs(swift_addr->sin_port);
+
+ err = -EINVAL;
+ if (port == 0 || port >= MAX_SWIFT_PORT) {
+ printk(KERN_ERR "Invalid value for sockaddr port (%u)\n", port);
+ goto out;
+ }
+
+ err = -EADDRINUSE;
+ if (swift_lookup(port) != NULL) {
+ printk(KERN_ERR "Port %u already in use\n", port);
+ goto out;
+ }
+
+ ssk = swift_sk(sock->sk);
+ ssk->src = port;
+
+ swift_hash(port, ssk);
+
+ printk(KERN_DEBUG "Socket %p bound to port %u\n", ssk, port);
+
+ return 0;
+
+out:
+ return -EINVAL;
+}
+
+static int swift_connect(struct socket *sock, struct sockaddr *addr, int addr_len, int flags)
+{
+ printk(KERN_DEBUG "swift_connect\n");
+ return 0;
+}
+
+static int swift_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
+{
+ int err;
+ __be16 dport;
+ __be32 daddr;
+ __be16 sport;
+ struct sk_buff * skb;
+ struct sock * sk;
+ struct inet_sock * isk;
+ struct swift_sock * ssk;
+ struct swifthdr * shdr;
+ int connected = 0;
+ int totlen;
+ struct rtable * rt = NULL;
+
+ err = -EINVAL;
+ if (sock == NULL) {
+ printk(KERN_ERR "Sock is NULL\n");
+ goto out;
+ }
+ sk = sock->sk;
+
+ err = -EINVAL;
+ if (sk == NULL) {
+ printk(KERN_ERR "Sock->sk is NULL\n");
+ goto out;
+ }
+
+ err = -ENOMEM;
+ sport = get_next_free_port();
+ if (sport == 0) {
+ printk(KERN_ERR "No free ports\n");
+ goto out;
+ }
+
+ isk = inet_sk(sk);
+ ssk = swift_sk(sk);
+
+ if (msg->msg_name) {
+ struct sockaddr_swift * swift_addr = (struct sockaddr_swift *) msg->msg_name;
+
+ err = -EINVAL;
+ if (msg->msg_namelen < sizeof(*swift_addr) || swift_addr->sin_family != AF_INET) {
+ printk(KERN_ERR "Invalid size or address family\n");
+ goto out;
+ }
+
+ dport = ntohs(swift_addr->sin_port);
+ if (dport == 0 || dport >= MAX_SWIFT_PORT) {
+ printk(KERN_ERR "Invalid value for destination port(%u)\n", dport);
+ goto out;
+ }
+
+ daddr = swift_addr->sin_addr.s_addr;
+ printk(KERN_DEBUG "Received from user space destination port=%u and address=%u\n", dport, daddr);
+ } else {
+ err = -EDESTADDRREQ;
+ if (!ssk->dst || !isk->inet_daddr) {
+ printk(KERN_ERR "No destination port/address\n");
+ goto out;
+ }
+ dport = ssk->dst;
+ daddr = isk->inet_daddr;
+
+ printk(KERN_DEBUG "Got from socket destination port=%u and address=%u\n", dport, daddr);
+ connected = 1;
+ }
+
+ totlen = len + sizeof(struct swifthdr) + sizeof(struct iphdr);
+ skb = sock_alloc_send_skb(sk, totlen, msg->msg_flags & MSG_DONTWAIT, &err);
+ if (!skb) {
+ printk(KERN_ERR "sock_alloc_send_skb failed\n");
+ goto out;
+ }
+ printk(KERN_DEBUG "Allocated %u bytes for skb (payload size=%u)\n", totlen, len);
+
+ skb_reset_network_header(skb);
+ skb_reserve(skb, sizeof(struct iphdr));
+ printk(KERN_DEBUG "Reseted network header\n");
+ skb_reset_transport_header(skb);
+ skb_put(skb, sizeof(struct swifthdr));
+ printk(KERN_DEBUG "Reseted transport header\n");
+
+ shdr = (struct swifthdr *) skb_transport_header(skb);
+ shdr->dst = ntohs(dport);
+ shdr->src = ntohs(sport);
+ shdr->len = ntohs(len + sizeof(struct swifthdr));
+
+ printk(KERN_DEBUG "payload=%p\n", skb_put(skb, len));
+
+ err = skb_copy_datagram_from_iovec(skb, sizeof(struct swifthdr), msg->msg_iov, 0, len);
+ if (err) {
+ printk(KERN_ERR "skb_copy_datagram_from_iovec failed\n");
+ goto out_free;
+ }
+ printk(KERN_DEBUG "Copied %u bytes into the skb\n", len);
+
+ if (connected)
+ rt = (struct rtable *) __sk_dst_check(sk, 0);
+
+ if (rt == NULL) {
+ struct flowi fl = { .fl4_dst = daddr,
+ .proto = sk->sk_protocol,
+ .flags = inet_sk_flowi_flags(sk),
+ };
+ err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
+ if (err) {
+ printk(KERN_ERR "Route lookup failed\n");
+ goto out_free;
+ }
+ sk_dst_set(sk, dst_clone(&rt->dst));
+ }
+
+ err = ip_queue_xmit(skb);
+ if (!err)
+ printk(KERN_DEBUG "Sent %u bytes on wire\n", len);
+ else
+ printk(KERN_ERR "ip_queue_xmit failed\n");
+
+ return err;
+
+out_free:
+ kfree(skb);
+
+out:
+ return err;
+}
+
+static int swift_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
+{
+ struct sk_buff *skb;
+ struct sockaddr_swift *swift_addr;
+ struct sock * sk = sock->sk;
+ int err, copied;
+
+ skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
+ if (!skb) {
+ printk(KERN_ERR "skb_recv_datagram\n");
+ goto out;
+ }
+
+ printk(KERN_DEBUG "Received skb %p\n", skb);
+
+ swift_addr = (struct sockaddr_swift *) skb->cb;
+ msg->msg_namelen = sizeof(struct sockaddr_swift);
+
+ copied = skb->len;
+ if (copied > len) {
+ copied = len;
+ msg->msg_flags |= MSG_TRUNC;
+ }
+
+ err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+ if (err) {
+ printk(KERN_ERR "skb_copy_datagram_iovec\n");
+ goto out_free;
+ }
+
+ sock_recv_ts_and_drops(msg, sk, skb);
+
+ if (msg->msg_name)
+ memcpy(msg->msg_name, swift_addr, msg->msg_namelen);
+
+ err = copied;
+
+out_free:
+ skb_free_datagram(sk, skb);
+
+out:
+ return err;
+}
+
+static int swift_rcv(struct sk_buff *skb)
+{
+ struct swifthdr *shdr;
+ struct swift_sock *ssk;
+ __be16 len;
+ __be16 src, dst;
+ struct sockaddr_swift * swift_addr;
+ int err;
+
+ if (!pskb_may_pull(skb, sizeof(struct swifthdr))) {
+ printk(KERN_ERR "Insufficient space for header\n");
+ goto drop;
+ }
+
+ shdr = (struct swifthdr *) skb->data;
+ len = ntohs(shdr->len);
+
+ if (skb->len < len) {
+ printk(KERN_ERR "Malformed packet (packet_len=%u, skb_len=%u)\n", len, skb->len);
+ goto drop;
+ }
+
+ if (len < sizeof(struct swifthdr)) {
+ printk(KERN_ERR "Malformed packet (packet_len=%u sizeof(swifthdr)=%u\n", len, sizeof(struct swifthdr));
+ goto drop;
+ }
+
+ src = ntohs(shdr->src);
+ dst = ntohs(shdr->dst);
+ if (src == 0 || dst == 0 || src >= MAX_SWIFT_PORT || dst >= MAX_SWIFT_PORT) {
+ printk(KERN_ERR "Malformed packet (src=%u, dst=%u)\n", shdr->src, shdr->dst);
+ goto drop;
+ }
+
+ skb_pull(skb, sizeof(struct swifthdr));
+ len -= sizeof(struct swifthdr);
+
+ pskb_trim(skb, len);
+
+ printk(KERN_DEBUG "Received %u bytes from from port=%u to port=%u\n", len - sizeof(struct swifthdr), src, dst);
+
+ ssk = swift_lookup(dst);
+ if (ssk == NULL) {
+ printk(KERN_ERR "Swift lookup failed for port %u\n", dst);
+ goto drop;
+ }
+
+ BUILD_BUG_ON(sizeof(struct sockaddr_swift) > sizeof(skb->cb));
+
+ swift_addr = (struct sockaddr_swift *) skb->cb;
+ swift_addr->sin_family = AF_INET;
+ swift_addr->sin_port = shdr->src;
+ swift_addr->sin_addr.s_addr = ip_hdr(skb)->saddr;
+
+ printk(KERN_DEBUG "Setting sin_port=%u, sin_addr=%u\n", ntohs(shdr->src), swift_addr->sin_addr.s_addr);
+
+ err = ip_queue_rcv_skb((struct sock *) &ssk->sock, skb);
+ if (err) {
+ printk(KERN_ERR "ip_queu_rcv_skb\n");
+ consume_skb(skb);
+ }
+ return NET_RX_SUCCESS;
+
+drop:
+ kfree(skb);
+ return NET_RX_DROP;
+}
+
+static struct proto swift_prot = {
+ .obj_size = sizeof(struct swift_sock),
+ .owner = THIS_MODULE,
+ .name = "SWIFT",
+};
+
+static const struct proto_ops swift_ops = {
+ .family = PF_INET,
+ .owner = THIS_MODULE,
+ .release = swift_release,
+ .bind = swift_bind,
+ .connect = swift_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = sock_no_getname,
+ .poll = datagram_poll,
+ .ioctl = sock_no_ioctl,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = sock_no_setsockopt,
+ .getsockopt = sock_no_getsockopt,
+ .sendmsg = swift_sendmsg,
+ .recvmsg = swift_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+};
+
+static const struct net_protocol swift_protocol = {
+ .handler = swift_rcv,
+ .no_policy = 1,
+ .netns_ok = 1,
+};
+
+static struct inet_protosw swift_protosw = {
+ .type = SOCK_DGRAM,
+ .protocol = IPPROTO_SWIFT,
+ .prot = &swift_prot,
+ .ops = &swift_ops,
+ .no_check = 0,
+};
+
+static int __init swift_init(void)
+{
+ int rc;
+
+ rc = proto_register(&swift_prot, 1);
+ if (rc) {
+ printk(KERN_ERR "Error registering swift protocol\n");
+ goto out;
+ }
+
+ rc = inet_add_protocol(&swift_protocol, IPPROTO_SWIFT);
+ if (rc) {
+ printk(KERN_ERR "Error adding swift protocol\n");
+ goto out_unregister;
+ }
+
+ inet_register_protosw(&swift_protosw);
+ printk(KERN_DEBUG "Swift entered\n");
+
+ return 0;
+
+out_unregister:
+ proto_unregister(&swift_prot);
+
+out:
+ return rc;
+}
+
+static void __exit swift_exit(void)
+{
+ inet_unregister_protosw(&swift_protosw);
+
+ inet_del_protocol(&swift_protocol, IPPROTO_SWIFT);
+
+ proto_unregister(&swift_prot);
+
+ printk(KERN_DEBUG "Swift exited\n");
+}
+
+module_init(swift_init);
+module_exit(swift_exit);
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