1 #include <linux/module.h>
3 #include <net/protocol.h>
9 MODULE_DESCRIPTION("Swift Transport Protocol");
10 MODULE_AUTHOR("Adrian Bondrescu/Cornel Mercan");
11 MODULE_LICENSE("GPL");
14 struct inet_sock sock;
15 /* swift socket speciffic data */
21 static struct swift_sock * sock_port_map[MAX_SWIFT_PORT];
23 static inline struct swift_sock * swift_sk(struct sock * sock)
25 return (struct swift_sock *)(sock);
28 static inline struct swifthdr * swift_hdr(const struct sk_buff * skb)
30 return (struct swifthdr *) skb_transport_header(skb);
33 static inline __be16 get_next_free_port(void)
36 for (i = MIN_SWIFT_PORT; i < MAX_SWIFT_PORT; i ++)
37 if (sock_port_map[i] == NULL)
42 static inline void swift_unhash(__be16 port)
44 sock_port_map[port] = NULL;
47 static inline void swift_hash(__be16 port, struct swift_sock *ssh)
49 sock_port_map[port] = ssh;
52 static inline struct swift_sock * swift_lookup(__be16 port)
54 return sock_port_map[port];
57 static int swift_release(struct socket *sock)
59 struct sock *sk = sock->sk;
60 struct swift_sock * ssk = swift_sk(sk);
65 swift_unhash(ssk->src);
67 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
74 skb_queue_purge(&sk->sk_receive_queue);
76 printk(KERN_DEBUG "swift_release sock=%p\n", sk);
82 static int swift_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
84 struct sockaddr_swift *swift_addr;
85 struct swift_sock *ssk;
90 if (addr_len < sizeof(struct sockaddr_swift)) {
91 printk(KERN_ERR "Invalid size for sockaddr\n");
95 swift_addr = (struct sockaddr_swift *) addr;
98 if (swift_addr->sin_family != AF_INET) {
99 printk(KERN_ERR "Invalid family for sockaddr\n");
103 port = ntohs(swift_addr->sin_port);
106 if (port == 0 || port >= MAX_SWIFT_PORT) {
107 printk(KERN_ERR "Invalid value for sockaddr port (%u)\n", port);
112 if (swift_lookup(port) != NULL) {
113 printk(KERN_ERR "Port %u already in use\n", port);
117 ssk = swift_sk(sock->sk);
120 swift_hash(port, ssk);
122 printk(KERN_DEBUG "Socket %p bound to port %u\n", ssk, port);
130 static int swift_connect(struct socket *sock, struct sockaddr *addr, int addr_len, int flags)
132 printk(KERN_DEBUG "swift_connect\n");
136 static int swift_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
142 struct sk_buff * skb;
144 struct inet_sock * isk;
145 struct swift_sock * ssk;
146 struct swifthdr * shdr;
149 struct rtable * rt = NULL;
153 printk(KERN_ERR "Sock is NULL\n");
160 printk(KERN_ERR "Sock->sk is NULL\n");
165 sport = get_next_free_port();
167 printk(KERN_ERR "No free ports\n");
175 struct sockaddr_swift * swift_addr = (struct sockaddr_swift *) msg->msg_name;
178 if (msg->msg_namelen < sizeof(*swift_addr) || swift_addr->sin_family != AF_INET) {
179 printk(KERN_ERR "Invalid size or address family\n");
183 dport = ntohs(swift_addr->sin_port);
184 if (dport == 0 || dport >= MAX_SWIFT_PORT) {
185 printk(KERN_ERR "Invalid value for destination port(%u)\n", dport);
189 daddr = swift_addr->sin_addr.s_addr;
190 printk(KERN_DEBUG "Received from user space destination port=%u and address=%u\n", dport, daddr);
193 if (!ssk->dst || !isk->inet_daddr) {
194 printk(KERN_ERR "No destination port/address\n");
198 daddr = isk->inet_daddr;
200 printk(KERN_DEBUG "Got from socket destination port=%u and address=%u\n", dport, daddr);
204 totlen = len + sizeof(struct swifthdr) + sizeof(struct iphdr);
205 skb = sock_alloc_send_skb(sk, totlen, msg->msg_flags & MSG_DONTWAIT, &err);
207 printk(KERN_ERR "sock_alloc_send_skb failed\n");
210 printk(KERN_DEBUG "Allocated %u bytes for skb (payload size=%u)\n", totlen, len);
212 skb_reset_network_header(skb);
213 skb_reserve(skb, sizeof(struct iphdr));
214 printk(KERN_DEBUG "Reseted network header\n");
215 skb_reset_transport_header(skb);
216 skb_put(skb, sizeof(struct swifthdr));
217 printk(KERN_DEBUG "Reseted transport header\n");
219 shdr = (struct swifthdr *) skb_transport_header(skb);
220 shdr->dst = ntohs(dport);
221 shdr->src = ntohs(sport);
222 shdr->len = ntohs(len + sizeof(struct swifthdr));
224 printk(KERN_DEBUG "payload=%p\n", skb_put(skb, len));
226 err = skb_copy_datagram_from_iovec(skb, sizeof(struct swifthdr), msg->msg_iov, 0, len);
228 printk(KERN_ERR "skb_copy_datagram_from_iovec failed\n");
231 printk(KERN_DEBUG "Copied %u bytes into the skb\n", len);
234 rt = (struct rtable *) __sk_dst_check(sk, 0);
237 struct flowi fl = { .fl4_dst = daddr,
238 .proto = sk->sk_protocol,
239 .flags = inet_sk_flowi_flags(sk),
241 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
243 printk(KERN_ERR "Route lookup failed\n");
246 sk_dst_set(sk, dst_clone(&rt->dst));
249 err = ip_queue_xmit(skb);
251 printk(KERN_DEBUG "Sent %u bytes on wire\n", len);
253 printk(KERN_ERR "ip_queue_xmit failed\n");
264 static int swift_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
267 struct sockaddr_swift *swift_addr;
268 struct sock * sk = sock->sk;
271 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
273 printk(KERN_ERR "skb_recv_datagram\n");
277 printk(KERN_DEBUG "Received skb %p\n", skb);
279 swift_addr = (struct sockaddr_swift *) skb->cb;
280 msg->msg_namelen = sizeof(struct sockaddr_swift);
285 msg->msg_flags |= MSG_TRUNC;
288 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
290 printk(KERN_ERR "skb_copy_datagram_iovec\n");
294 sock_recv_ts_and_drops(msg, sk, skb);
297 memcpy(msg->msg_name, swift_addr, msg->msg_namelen);
302 skb_free_datagram(sk, skb);
308 static int swift_rcv(struct sk_buff *skb)
310 struct swifthdr *shdr;
311 struct swift_sock *ssk;
314 struct sockaddr_swift * swift_addr;
317 if (!pskb_may_pull(skb, sizeof(struct swifthdr))) {
318 printk(KERN_ERR "Insufficient space for header\n");
322 shdr = (struct swifthdr *) skb->data;
323 len = ntohs(shdr->len);
325 if (skb->len < len) {
326 printk(KERN_ERR "Malformed packet (packet_len=%u, skb_len=%u)\n", len, skb->len);
330 if (len < sizeof(struct swifthdr)) {
331 printk(KERN_ERR "Malformed packet (packet_len=%u sizeof(swifthdr)=%u\n", len, sizeof(struct swifthdr));
335 src = ntohs(shdr->src);
336 dst = ntohs(shdr->dst);
337 if (src == 0 || dst == 0 || src >= MAX_SWIFT_PORT || dst >= MAX_SWIFT_PORT) {
338 printk(KERN_ERR "Malformed packet (src=%u, dst=%u)\n", shdr->src, shdr->dst);
342 skb_pull(skb, sizeof(struct swifthdr));
343 len -= sizeof(struct swifthdr);
347 printk(KERN_DEBUG "Received %u bytes from from port=%u to port=%u\n", len - sizeof(struct swifthdr), src, dst);
349 ssk = swift_lookup(dst);
351 printk(KERN_ERR "Swift lookup failed for port %u\n", dst);
355 BUILD_BUG_ON(sizeof(struct sockaddr_swift) > sizeof(skb->cb));
357 swift_addr = (struct sockaddr_swift *) skb->cb;
358 swift_addr->sin_family = AF_INET;
359 swift_addr->sin_port = shdr->src;
360 swift_addr->sin_addr.s_addr = ip_hdr(skb)->saddr;
362 printk(KERN_DEBUG "Setting sin_port=%u, sin_addr=%u\n", ntohs(shdr->src), swift_addr->sin_addr.s_addr);
364 err = ip_queue_rcv_skb((struct sock *) &ssk->sock, skb);
366 printk(KERN_ERR "ip_queu_rcv_skb\n");
369 return NET_RX_SUCCESS;
376 static struct proto swift_prot = {
377 .obj_size = sizeof(struct swift_sock),
378 .owner = THIS_MODULE,
382 static const struct proto_ops swift_ops = {
384 .owner = THIS_MODULE,
385 .release = swift_release,
387 .connect = swift_connect,
388 .socketpair = sock_no_socketpair,
389 .accept = sock_no_accept,
390 .getname = sock_no_getname,
391 .poll = datagram_poll,
392 .ioctl = sock_no_ioctl,
393 .listen = sock_no_listen,
394 .shutdown = sock_no_shutdown,
395 .setsockopt = sock_no_setsockopt,
396 .getsockopt = sock_no_getsockopt,
397 .sendmsg = swift_sendmsg,
398 .recvmsg = swift_recvmsg,
399 .mmap = sock_no_mmap,
400 .sendpage = sock_no_sendpage,
403 static const struct net_protocol swift_protocol = {
404 .handler = swift_rcv,
409 static struct inet_protosw swift_protosw = {
411 .protocol = IPPROTO_SWIFT,
417 static int __init swift_init(void)
421 rc = proto_register(&swift_prot, 1);
423 printk(KERN_ERR "Error registering swift protocol\n");
427 rc = inet_add_protocol(&swift_protocol, IPPROTO_SWIFT);
429 printk(KERN_ERR "Error adding swift protocol\n");
433 inet_register_protosw(&swift_protosw);
434 printk(KERN_DEBUG "Swift entered\n");
439 proto_unregister(&swift_prot);
445 static void __exit swift_exit(void)
447 inet_unregister_protosw(&swift_protosw);
449 inet_del_protocol(&swift_protocol, IPPROTO_SWIFT);
451 proto_unregister(&swift_prot);
453 printk(KERN_DEBUG "Swift exited\n");
456 module_init(swift_init);
457 module_exit(swift_exit);