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 */
20 static struct swift_sock * sock_port_map[MAX_SWIFT_PORT];
22 static inline struct swift_sock * swift_sk(struct sock * sock)
24 return (struct swift_sock *)(sock);
27 static inline struct swifthdr * swift_hdr(const struct sk_buff * skb)
29 return (struct swifthdr *) skb_transport_header(skb);
32 static inline __be16 get_next_free_port(void)
35 for (i = MIN_SWIFT_PORT; i < MAX_SWIFT_PORT; i ++)
36 if (sock_port_map[i] == NULL)
41 static inline void swift_unhash(__be16 port)
43 sock_port_map[port] = NULL;
46 static inline void swift_hash(__be16 port, struct swift_sock *ssh)
48 sock_port_map[port] = ssh;
51 static inline struct swift_sock * swift_lookup(__be16 port)
53 return sock_port_map[port];
56 static int swift_release(struct socket *sock)
58 struct sock *sk = sock->sk;
59 struct swift_sock * ssk = swift_sk(sk);
64 swift_unhash(ssk->src);
66 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
73 skb_queue_purge(&sk->sk_receive_queue);
75 printk(KERN_DEBUG "swift_release sock=%p\n", sk);
81 static int swift_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
83 struct sockaddr_swift *swift_addr;
84 struct swift_sock *ssk;
89 if (addr_len < sizeof(struct sockaddr_swift)) {
90 printk(KERN_ERR "Invalid size for sockaddr\n");
94 swift_addr = (struct sockaddr_swift *) addr;
97 if (swift_addr->sin_family != AF_INET) {
98 printk(KERN_ERR "Invalid family for sockaddr\n");
102 port = ntohs(swift_addr->sin_port);
105 if (port == 0 || port >= MAX_SWIFT_PORT) {
106 printk(KERN_ERR "Invalid value for sockaddr port (%u)\n", port);
111 if (swift_lookup(port) != NULL) {
112 printk(KERN_ERR "Port %u already in use\n", port);
116 ssk = swift_sk(sock->sk);
119 swift_hash(port, ssk);
121 printk(KERN_DEBUG "Socket %p bound to port %u\n", ssk, port);
129 static int swift_connect(struct socket *sock, struct sockaddr *addr, int addr_len, int flags)
133 struct inet_sock * isk;
134 struct swift_sock * ssk;
136 printk(KERN_DEBUG "swift_connect\n");
140 printk(KERN_ERR "Sock is NULL\n");
147 printk(KERN_ERR "Sock->sk is NULL\n");
155 printk(KERN_ERR "ssk->src is not NULL\n");
161 struct sockaddr_swift * swift_addr = (struct sockaddr_swift *) addr;
164 if (addr_len < sizeof(*swift_addr) || swift_addr->sin_family != AF_INET) {
165 printk(KERN_ERR "Invalid size or address family\n");
168 ssk->dst = ntohs(swift_addr->sin_port);
169 if (ssk->dst == 0 || ssk->dst >= MAX_SWIFT_PORT) {
170 printk(KERN_ERR "Invalid value for destination port(%u)\n", ssk->dst);
174 isk->inet_daddr = swift_addr->sin_addr.s_addr;
175 printk(KERN_DEBUG "Received from user space destination port=%u and address=%u\n", ssk->dst, isk->inet_daddr);
177 printk(KERN_ERR "Invalid swift_addr (NULL)\n");
182 ssk->src = get_next_free_port();
184 printk(KERN_ERR "No free ports\n");
188 swift_hash(ssk->src, ssk);
197 static int swift_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
203 struct sk_buff * skb;
205 struct inet_sock * isk;
206 struct swift_sock * ssk;
207 struct swifthdr * shdr;
210 struct rtable * rt = NULL;
214 printk(KERN_ERR "Sock is NULL\n");
221 printk(KERN_ERR "Sock->sk is NULL\n");
231 sport = get_next_free_port();
233 printk(KERN_ERR "No free ports\n");
239 struct sockaddr_swift * swift_addr = (struct sockaddr_swift *) msg->msg_name;
242 if (msg->msg_namelen < sizeof(*swift_addr) || swift_addr->sin_family != AF_INET) {
243 printk(KERN_ERR "Invalid size or address family\n");
247 dport = ntohs(swift_addr->sin_port);
248 if (dport == 0 || dport >= MAX_SWIFT_PORT) {
249 printk(KERN_ERR "Invalid value for destination port(%u)\n", dport);
253 daddr = swift_addr->sin_addr.s_addr;
254 printk(KERN_DEBUG "Received from user space destination port=%u and address=%u\n", dport, daddr);
257 if (!ssk->dst || !isk->inet_daddr) {
258 printk(KERN_ERR "No destination port/address\n");
262 daddr = isk->inet_daddr;
264 printk(KERN_DEBUG "Got from socket destination port=%u and address=%u\n", dport, daddr);
268 totlen = len + sizeof(struct swifthdr) + sizeof(struct iphdr);
269 skb = sock_alloc_send_skb(sk, totlen, msg->msg_flags & MSG_DONTWAIT, &err);
271 printk(KERN_ERR "sock_alloc_send_skb failed\n");
274 printk(KERN_DEBUG "Allocated %u bytes for skb (payload size=%u)\n", totlen, len);
276 skb_reset_network_header(skb);
277 skb_reserve(skb, sizeof(struct iphdr));
278 printk(KERN_DEBUG "Reseted network header\n");
279 skb_reset_transport_header(skb);
280 skb_put(skb, sizeof(struct swifthdr));
281 printk(KERN_DEBUG "Reseted transport header\n");
283 shdr = (struct swifthdr *) skb_transport_header(skb);
284 shdr->dst = ntohs(dport);
285 shdr->src = ntohs(sport);
286 shdr->len = ntohs(len + sizeof(struct swifthdr));
288 printk(KERN_DEBUG "payload=%p\n", skb_put(skb, len));
290 err = skb_copy_datagram_from_iovec(skb, sizeof(struct swifthdr), msg->msg_iov, 0, len);
292 printk(KERN_ERR "skb_copy_datagram_from_iovec failed\n");
295 printk(KERN_DEBUG "Copied %u bytes into the skb\n", len);
298 rt = (struct rtable *) __sk_dst_check(sk, 0);
301 struct flowi fl = { .fl4_dst = daddr,
302 .proto = sk->sk_protocol,
303 .flags = inet_sk_flowi_flags(sk),
305 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
307 printk(KERN_ERR "Route lookup failed\n");
310 sk_dst_set(sk, dst_clone(&rt->dst));
313 err = ip_queue_xmit(skb);
315 printk(KERN_DEBUG "Sent %u bytes on wire\n", len);
317 printk(KERN_ERR "ip_queue_xmit failed\n");
328 static int swift_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
331 struct sockaddr_swift *swift_addr;
332 struct sock * sk = sock->sk;
335 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
337 printk(KERN_ERR "skb_recv_datagram\n");
341 printk(KERN_DEBUG "Received skb %p\n", skb);
343 swift_addr = (struct sockaddr_swift *) skb->cb;
344 msg->msg_namelen = sizeof(struct sockaddr_swift);
349 msg->msg_flags |= MSG_TRUNC;
352 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
354 printk(KERN_ERR "skb_copy_datagram_iovec\n");
358 sock_recv_ts_and_drops(msg, sk, skb);
361 memcpy(msg->msg_name, swift_addr, msg->msg_namelen);
366 skb_free_datagram(sk, skb);
372 static int swift_rcv(struct sk_buff *skb)
374 struct swifthdr *shdr;
375 struct swift_sock *ssk;
378 struct sockaddr_swift * swift_addr;
381 if (!pskb_may_pull(skb, sizeof(struct swifthdr))) {
382 printk(KERN_ERR "Insufficient space for header\n");
386 shdr = (struct swifthdr *) skb->data;
387 len = ntohs(shdr->len);
389 if (skb->len < len) {
390 printk(KERN_ERR "Malformed packet (packet_len=%u, skb_len=%u)\n", len, skb->len);
394 if (len < sizeof(struct swifthdr)) {
395 printk(KERN_ERR "Malformed packet (packet_len=%u sizeof(swifthdr)=%u\n", len, sizeof(struct swifthdr));
399 src = ntohs(shdr->src);
400 dst = ntohs(shdr->dst);
401 if (src == 0 || dst == 0 || src >= MAX_SWIFT_PORT || dst >= MAX_SWIFT_PORT) {
402 printk(KERN_ERR "Malformed packet (src=%u, dst=%u)\n", shdr->src, shdr->dst);
406 skb_pull(skb, sizeof(struct swifthdr));
407 len -= sizeof(struct swifthdr);
411 printk(KERN_DEBUG "Received %u bytes from from port=%u to port=%u\n", len - sizeof(struct swifthdr), src, dst);
413 ssk = swift_lookup(dst);
415 printk(KERN_ERR "Swift lookup failed for port %u\n", dst);
419 BUILD_BUG_ON(sizeof(struct sockaddr_swift) > sizeof(skb->cb));
421 swift_addr = (struct sockaddr_swift *) skb->cb;
422 swift_addr->sin_family = AF_INET;
423 swift_addr->sin_port = shdr->src;
424 swift_addr->sin_addr.s_addr = ip_hdr(skb)->saddr;
426 printk(KERN_DEBUG "Setting sin_port=%u, sin_addr=%u\n", ntohs(shdr->src), swift_addr->sin_addr.s_addr);
428 err = ip_queue_rcv_skb((struct sock *) &ssk->sock, skb);
430 printk(KERN_ERR "ip_queu_rcv_skb\n");
433 return NET_RX_SUCCESS;
440 static struct proto swift_prot = {
441 .obj_size = sizeof(struct swift_sock),
442 .owner = THIS_MODULE,
446 static const struct proto_ops swift_ops = {
448 .owner = THIS_MODULE,
449 .release = swift_release,
451 .connect = swift_connect,
452 .socketpair = sock_no_socketpair,
453 .accept = sock_no_accept,
454 .getname = sock_no_getname,
455 .poll = datagram_poll,
456 .ioctl = sock_no_ioctl,
457 .listen = sock_no_listen,
458 .shutdown = sock_no_shutdown,
459 .setsockopt = sock_no_setsockopt,
460 .getsockopt = sock_no_getsockopt,
461 .sendmsg = swift_sendmsg,
462 .recvmsg = swift_recvmsg,
463 .mmap = sock_no_mmap,
464 .sendpage = sock_no_sendpage,
467 static const struct net_protocol swift_protocol = {
468 .handler = swift_rcv,
473 static struct inet_protosw swift_protosw = {
475 .protocol = IPPROTO_SWIFT,
481 static int __init swift_init(void)
485 rc = proto_register(&swift_prot, 1);
487 printk(KERN_ERR "Error registering swift protocol\n");
491 rc = inet_add_protocol(&swift_protocol, IPPROTO_SWIFT);
493 printk(KERN_ERR "Error adding swift protocol\n");
497 inet_register_protosw(&swift_protosw);
498 printk(KERN_DEBUG "Swift entered\n");
503 proto_unregister(&swift_prot);
509 static void __exit swift_exit(void)
511 inet_unregister_protosw(&swift_protosw);
513 inet_del_protocol(&swift_protocol, IPPROTO_SWIFT);
515 proto_unregister(&swift_prot);
517 printk(KERN_DEBUG "Swift exited\n");
520 module_init(swift_init);
521 module_exit(swift_exit);