1 #include <linux/module.h>
3 #include <net/protocol.h>
10 MODULE_DESCRIPTION("Swift Transport Protocol");
11 MODULE_AUTHOR("Adrian Bondrescu/Cornel Mercan");
12 MODULE_LICENSE("GPL");
15 struct inet_sock sock;
16 /* 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 log_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 log_error("Invalid size for sockaddr\n");
95 swift_addr = (struct sockaddr_swift *) addr;
98 if (swift_addr->sin_family != AF_INET) {
99 log_error("Invalid family for sockaddr\n");
103 port = ntohs(swift_addr->sin_port);
106 if (port == 0 || port >= MAX_SWIFT_PORT) {
107 log_error("Invalid value for sockaddr port (%u)\n", port);
112 if (swift_lookup(port) != NULL) {
113 log_error("Port %u already in use\n", port);
117 ssk = swift_sk(sock->sk);
120 swift_hash(port, ssk);
122 log_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)
134 struct inet_sock * isk;
135 struct swift_sock * ssk;
137 log_debug("swift_connect\n");
141 log_error("Sock is NULL\n");
148 log_error("Sock->sk is NULL\n");
156 log_error("ssk->src is not NULL\n");
162 struct sockaddr_swift * swift_addr = (struct sockaddr_swift *) addr;
165 if (addr_len < sizeof(*swift_addr) || swift_addr->sin_family != AF_INET) {
166 log_error("Invalid size or address family\n");
169 ssk->dst = ntohs(swift_addr->sin_port);
170 if (ssk->dst == 0 || ssk->dst >= MAX_SWIFT_PORT) {
171 log_error("Invalid value for destination port(%u)\n", ssk->dst);
175 isk->inet_daddr = swift_addr->sin_addr.s_addr;
176 log_debug("Received from user space destination port=%u and address=%u\n", ssk->dst, isk->inet_daddr);
178 log_error("Invalid swift_addr (NULL)\n");
183 ssk->src = get_next_free_port();
185 log_error("No free ports\n");
189 swift_hash(ssk->src, ssk);
198 static int swift_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
204 struct sk_buff * skb;
206 struct inet_sock * isk;
207 struct swift_sock * ssk;
208 struct swifthdr * shdr;
211 struct rtable * rt = NULL;
215 log_error("Sock is NULL\n");
222 log_error("Sock->sk is NULL\n");
232 sport = get_next_free_port();
234 log_error("No free ports\n");
240 struct sockaddr_swift * swift_addr = (struct sockaddr_swift *) msg->msg_name;
243 if (msg->msg_namelen < sizeof(*swift_addr) || swift_addr->sin_family != AF_INET) {
244 log_error("Invalid size or address family\n");
248 dport = ntohs(swift_addr->sin_port);
249 if (dport == 0 || dport >= MAX_SWIFT_PORT) {
250 log_error("Invalid value for destination port(%u)\n", dport);
254 daddr = swift_addr->sin_addr.s_addr;
255 log_debug("Received from user space destination port=%u and address=%u\n", dport, daddr);
258 if (!ssk->dst || !isk->inet_daddr) {
259 log_error("No destination port/address\n");
263 daddr = isk->inet_daddr;
265 log_debug("Got from socket destination port=%u and address=%u\n", dport, daddr);
269 totlen = len + sizeof(struct swifthdr) + sizeof(struct iphdr);
270 skb = sock_alloc_send_skb(sk, totlen, msg->msg_flags & MSG_DONTWAIT, &err);
272 log_error("sock_alloc_send_skb failed\n");
275 log_debug("Allocated %u bytes for skb (payload size=%u)\n", totlen, len);
277 skb_reset_network_header(skb);
278 skb_reserve(skb, sizeof(struct iphdr));
279 log_debug("Reseted network header\n");
280 skb_reset_transport_header(skb);
281 skb_put(skb, sizeof(struct swifthdr));
282 log_debug("Reseted transport header\n");
284 shdr = (struct swifthdr *) skb_transport_header(skb);
285 shdr->dst = ntohs(dport);
286 shdr->src = ntohs(sport);
287 shdr->len = ntohs(len + sizeof(struct swifthdr));
289 log_debug("payload=%p\n", skb_put(skb, len));
291 err = skb_copy_datagram_from_iovec(skb, sizeof(struct swifthdr), msg->msg_iov, 0, len);
293 log_error("skb_copy_datagram_from_iovec failed\n");
296 log_debug("Copied %u bytes into the skb\n", len);
299 rt = (struct rtable *) __sk_dst_check(sk, 0);
302 struct flowi fl = { .fl4_dst = daddr,
303 .proto = sk->sk_protocol,
304 .flags = inet_sk_flowi_flags(sk),
306 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
308 log_error("Route lookup failed\n");
311 sk_dst_set(sk, dst_clone(&rt->dst));
314 err = ip_queue_xmit(skb);
316 log_debug("Sent %u bytes on wire\n", len);
318 log_error("ip_queue_xmit failed\n");
329 static int swift_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
332 struct sockaddr_swift *swift_addr;
333 struct sock * sk = sock->sk;
336 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
338 log_error("skb_recv_datagram\n");
342 log_debug("Received skb %p\n", skb);
344 swift_addr = (struct sockaddr_swift *) skb->cb;
345 msg->msg_namelen = sizeof(struct sockaddr_swift);
350 msg->msg_flags |= MSG_TRUNC;
353 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
355 log_error("skb_copy_datagram_iovec\n");
359 sock_recv_ts_and_drops(msg, sk, skb);
362 memcpy(msg->msg_name, swift_addr, msg->msg_namelen);
367 skb_free_datagram(sk, skb);
373 static int swift_rcv(struct sk_buff *skb)
375 struct swifthdr *shdr;
376 struct swift_sock *ssk;
379 struct sockaddr_swift * swift_addr;
382 if (!pskb_may_pull(skb, sizeof(struct swifthdr))) {
383 log_error("Insufficient space for header\n");
387 shdr = (struct swifthdr *) skb->data;
388 len = ntohs(shdr->len);
390 if (skb->len < len) {
391 log_error("Malformed packet (packet_len=%u, skb_len=%u)\n", len, skb->len);
395 if (len < sizeof(struct swifthdr)) {
396 log_error("Malformed packet (packet_len=%u sizeof(swifthdr)=%u\n", len, sizeof(struct swifthdr));
400 src = ntohs(shdr->src);
401 dst = ntohs(shdr->dst);
402 if (src == 0 || dst == 0 || src >= MAX_SWIFT_PORT || dst >= MAX_SWIFT_PORT) {
403 log_error("Malformed packet (src=%u, dst=%u)\n", shdr->src, shdr->dst);
407 skb_pull(skb, sizeof(struct swifthdr));
408 len -= sizeof(struct swifthdr);
412 log_debug("Received %u bytes from from port=%u to port=%u\n", len - sizeof(struct swifthdr), src, dst);
414 ssk = swift_lookup(dst);
416 log_error("Swift lookup failed for port %u\n", dst);
420 BUILD_BUG_ON(sizeof(struct sockaddr_swift) > sizeof(skb->cb));
422 swift_addr = (struct sockaddr_swift *) skb->cb;
423 swift_addr->sin_family = AF_INET;
424 swift_addr->sin_port = shdr->src;
425 swift_addr->sin_addr.s_addr = ip_hdr(skb)->saddr;
427 log_debug("Setting sin_port=%u, sin_addr=%u\n", ntohs(shdr->src), swift_addr->sin_addr.s_addr);
429 err = ip_queue_rcv_skb((struct sock *) &ssk->sock, skb);
431 log_error("ip_queu_rcv_skb\n");
434 return NET_RX_SUCCESS;
441 static struct proto swift_prot = {
442 .obj_size = sizeof(struct swift_sock),
443 .owner = THIS_MODULE,
447 static const struct proto_ops swift_ops = {
449 .owner = THIS_MODULE,
450 .release = swift_release,
452 .connect = swift_connect,
453 .socketpair = sock_no_socketpair,
454 .accept = sock_no_accept,
455 .getname = sock_no_getname,
456 .poll = datagram_poll,
457 .ioctl = sock_no_ioctl,
458 .listen = sock_no_listen,
459 .shutdown = sock_no_shutdown,
460 .setsockopt = sock_no_setsockopt,
461 .getsockopt = sock_no_getsockopt,
462 .sendmsg = swift_sendmsg,
463 .recvmsg = swift_recvmsg,
464 .mmap = sock_no_mmap,
465 .sendpage = sock_no_sendpage,
468 static const struct net_protocol swift_protocol = {
469 .handler = swift_rcv,
474 static struct inet_protosw swift_protosw = {
476 .protocol = IPPROTO_SWIFT,
482 static int __init swift_init(void)
486 rc = proto_register(&swift_prot, 1);
488 log_error("Error registering swift protocol\n");
492 rc = inet_add_protocol(&swift_protocol, IPPROTO_SWIFT);
494 log_error("Error adding swift protocol\n");
498 inet_register_protosw(&swift_protosw);
499 log_debug("Swift entered\n");
504 proto_unregister(&swift_prot);
510 static void __exit swift_exit(void)
512 inet_unregister_protosw(&swift_protosw);
514 inet_del_protocol(&swift_protocol, IPPROTO_SWIFT);
516 proto_unregister(&swift_prot);
518 log_debug("Swift exited\n");
521 module_init(swift_init);
522 module_exit(swift_exit);