1 #include <linux/module.h>
2 #include <linux/version.h>
4 #include <net/protocol.h>
11 MODULE_DESCRIPTION("Swift Transport Protocol");
12 MODULE_AUTHOR("Adrian Bondrescu/Cornel Mercan");
13 MODULE_LICENSE("GPL");
16 struct inet_sock sock;
17 /* swift socket speciffic data */
22 static struct swift_sock * sock_port_map[MAX_SWIFT_PORT];
24 static inline struct swift_sock * swift_sk(struct sock * sock)
26 return (struct swift_sock *)(sock);
29 static inline struct swifthdr * swift_hdr(const struct sk_buff * skb)
31 return (struct swifthdr *) skb_transport_header(skb);
34 static inline uint8_t get_next_free_port(void)
37 for (i = MIN_SWIFT_PORT; i < MAX_SWIFT_PORT; i ++)
38 if (sock_port_map[i] == NULL)
43 static inline void swift_unhash(uint8_t port)
45 sock_port_map[port] = NULL;
48 static inline void swift_hash(uint8_t port, struct swift_sock *ssh)
50 sock_port_map[port] = ssh;
53 static inline struct swift_sock * swift_lookup(uint8_t port)
55 return sock_port_map[port];
58 static int swift_release(struct socket *sock)
60 struct sock *sk = sock->sk;
61 struct swift_sock * ssk = swift_sk(sk);
66 swift_unhash(ssk->src);
68 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
75 skb_queue_purge(&sk->sk_receive_queue);
77 log_debug("swift_release sock=%p\n", sk);
83 static int swift_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
85 struct sockaddr_swift *swift_addr;
86 struct swift_sock *ssk;
90 if (unlikely(addr_len < sizeof(struct sockaddr_swift))) {
91 log_error("Invalid size for sockaddr\n");
96 swift_addr = (struct sockaddr_swift *) addr;
98 port = swift_addr->dests[0].port;
100 if (unlikely(port == 0 || port >= MAX_SWIFT_PORT)) {
101 log_error("Invalid value for sockaddr port (%u)\n", port);
106 if (unlikely(swift_lookup(port) != NULL)) {
107 log_error("Port %u already in use\n", port);
112 ssk = swift_sk(sock->sk);
115 swift_hash(port, ssk);
117 log_debug("Socket %p bound to port %u\n", ssk, port);
125 static int swift_connect(struct socket *sock, struct sockaddr *addr, int addr_len, int flags)
129 struct inet_sock * isk;
130 struct swift_sock * ssk;
132 log_debug("swift_connect\n");
134 if (unlikely(sock == NULL)) {
135 log_error("Sock is NULL\n");
141 if (unlikely(sk == NULL)) {
142 log_error("Sock->sk is NULL\n");
150 if (unlikely(ssk->src != 0)) {
151 log_error("ssk->src is not NULL\n");
157 struct sockaddr_swift * swift_addr = (struct sockaddr_swift *) addr;
159 if (unlikely(addr_len < sizeof(*swift_addr) ||
160 addr_len < swift_addr->count * sizeof(struct swift_dest) ||
161 swift_addr->count <= 0)) {
162 log_error("Invalid size or address family\n");
166 ssk->dst = swift_addr->dests[0].port;
167 if (unlikely(ssk->dst == 0 || ssk->dst >= MAX_SWIFT_PORT)) {
168 log_error("Invalid value for destination port(%u)\n", ssk->dst);
173 isk->inet_daddr = swift_addr->dests[0].addr;
174 log_debug("Received from user space destination port=%u and address=%u\n", ssk->dst, isk->inet_daddr);
176 log_error("Invalid swift_addr (NULL)\n");
181 ssk->src = get_next_free_port();
182 if (unlikely(ssk->src == 0)) {
183 log_error("No free ports\n");
188 swift_hash(ssk->src, ssk);
196 static int swift_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
202 struct sk_buff * skb;
204 struct inet_sock * isk;
205 struct swift_sock * ssk;
206 struct swifthdr * shdr;
209 struct rtable * rt = NULL;
212 struct sockaddr_swift * swift_addr = NULL;
214 if (unlikely(sock == NULL)) {
215 log_error("Sock is NULL\n");
221 if (unlikely(sk == NULL)) {
222 log_error("Sock->sk is NULL\n");
232 sport = get_next_free_port();
233 if (unlikely(sport == 0)) {
234 log_error("No free ports\n");
241 swift_addr = (struct sockaddr_swift *) msg->msg_name;
243 if (unlikely(msg->msg_namelen < sizeof(*swift_addr) ||
244 msg->msg_namelen < swift_addr->count * sizeof(struct swift_dest) ||
245 swift_addr->count <= 0)) {
246 log_error("Invalid size for msg_name\n");
251 dests = swift_addr->count;
254 if (unlikely(!ssk->dst || !isk->inet_daddr)) {
255 log_error("No destination port/address\n");
260 daddr = isk->inet_daddr;
262 log_debug("Got from socket destination port=%u and address=%u\n", dport, daddr);
266 if (msg->msg_iovlen < dests)
267 dests = msg->msg_iovlen;
269 for (i = 0; i < dests; i++) {
270 struct swift_dest *dest = &swift_addr->dests[i];
271 struct iovec *iov = &msg->msg_iov[i];
274 if (unlikely(dport == 0 || dport >= MAX_SWIFT_PORT)) {
275 log_error("Invalid value for destination port(%u)\n", dport);
281 log_debug("Received from user space destination port=%u and address=%u\n", dport, daddr);
284 totlen = len + sizeof(struct swifthdr) + sizeof(struct iphdr);
285 skb = sock_alloc_send_skb(sk, totlen, msg->msg_flags & MSG_DONTWAIT, &err);
286 if (unlikely(!skb)) {
287 log_error("sock_alloc_send_skb failed\n");
290 log_debug("Allocated %u bytes for skb (payload size=%u)\n", totlen, len);
292 skb_reset_network_header(skb);
293 skb_reserve(skb, sizeof(struct iphdr));
294 log_debug("Reseted network header\n");
295 skb_reset_transport_header(skb);
296 skb_put(skb, sizeof(struct swifthdr));
297 log_debug("Reseted transport header\n");
299 shdr = (struct swifthdr *) skb_transport_header(skb);
302 shdr->len = ntohs(len + sizeof(struct swifthdr));
304 log_debug("payload=%p\n", skb_put(skb, len));
306 err = skb_copy_datagram_from_iovec(skb, sizeof(struct swifthdr), iov, 0, len);
308 log_error("skb_copy_datagram_from_iovec failed\n");
311 log_debug("Copied %u bytes into the skb\n", len);
314 rt = (struct rtable *) __sk_dst_check(sk, 0);
317 struct flowi fl = { .fl4_dst = daddr,
318 .proto = sk->sk_protocol,
319 .flags = inet_sk_flowi_flags(sk),
321 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
323 log_error("Route lookup failed\n");
326 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
327 sk_dst_set(sk, dst_clone(&rt->u.dst));
329 sk_dst_set(sk, dst_clone(&rt->dst));
333 err = ip_queue_xmit(skb);
335 log_debug("Sent %u bytes on wire\n", len);
337 log_error("ip_queue_xmit failed\n");
349 static int swift_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
352 struct sockaddr_swift *swift_addr;
353 struct sock * sk = sock->sk;
356 log_debug("Trying to receive sock=%p sk=%p flags=%d\n", sock, sk, flags);
358 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
359 if (unlikely(!skb)) {
360 log_error("skb_recv_datagram\n");
364 log_debug("Received skb %p\n", skb);
366 swift_addr = (struct sockaddr_swift *) skb->cb;
367 msg->msg_namelen = sizeof(struct sockaddr_swift);
372 msg->msg_flags |= MSG_TRUNC;
375 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
377 log_error("skb_copy_datagram_iovec\n");
381 sock_recv_ts_and_drops(msg, sk, skb);
384 memcpy(msg->msg_name, swift_addr, msg->msg_namelen);
389 skb_free_datagram(sk, skb);
395 static int swift_rcv(struct sk_buff *skb)
397 struct swifthdr *shdr;
398 struct swift_sock *ssk;
401 struct sockaddr_swift * swift_addr;
404 if (unlikely(!pskb_may_pull(skb, sizeof(struct swifthdr)))) {
405 log_error("Insufficient space for header\n");
409 shdr = (struct swifthdr *) skb->data;
410 len = ntohs(shdr->len);
412 if (unlikely(skb->len < len)) {
413 log_error("Malformed packet (packet_len=%u, skb_len=%u)\n", len, skb->len);
417 if (unlikely(len < sizeof(struct swifthdr))) {
418 log_error("Malformed packet (packet_len=%u sizeof(swifthdr)=%u\n", len, sizeof(struct swifthdr));
424 if (unlikely(src == 0 || dst == 0 || src >= MAX_SWIFT_PORT || dst >= MAX_SWIFT_PORT)) {
425 log_error("Malformed packet (src=%u, dst=%u)\n", shdr->src, shdr->dst);
429 skb_pull(skb, sizeof(struct swifthdr));
430 len -= sizeof(struct swifthdr);
434 log_debug("Received %u bytes from from port=%u to port=%u\n", len - sizeof(struct swifthdr), src, dst);
436 ssk = swift_lookup(dst);
438 log_error("Swift lookup failed for port %u\n", dst);
442 BUILD_BUG_ON(sizeof(struct sockaddr_swift) > sizeof(skb->cb));
444 swift_addr = (struct sockaddr_swift *) skb->cb;
445 swift_addr->dests[0].port = shdr->src;
446 swift_addr->dests[0].addr = ip_hdr(skb)->saddr;
448 log_debug("Setting sin_port=%u, sin_addr=%u\n", ntohs(shdr->src), swift_addr->dests[0].addr);
450 err = ip_queue_rcv_skb((struct sock *) &ssk->sock, skb);
452 log_error("ip_queu_rcv_skb\n");
455 return NET_RX_SUCCESS;
462 static struct proto swift_prot = {
463 .obj_size = sizeof(struct swift_sock),
464 .owner = THIS_MODULE,
468 static const struct proto_ops swift_ops = {
470 .owner = THIS_MODULE,
471 .release = swift_release,
473 .connect = swift_connect,
474 .socketpair = sock_no_socketpair,
475 .accept = sock_no_accept,
476 .getname = sock_no_getname,
477 .poll = datagram_poll,
478 .ioctl = sock_no_ioctl,
479 .listen = sock_no_listen,
480 .shutdown = sock_no_shutdown,
481 .setsockopt = sock_no_setsockopt,
482 .getsockopt = sock_no_getsockopt,
483 .sendmsg = swift_sendmsg,
484 .recvmsg = swift_recvmsg,
485 .mmap = sock_no_mmap,
486 .sendpage = sock_no_sendpage,
489 static const struct net_protocol swift_protocol = {
490 .handler = swift_rcv,
495 static struct inet_protosw swift_protosw = {
497 .protocol = IPPROTO_SWIFT,
503 static int __init swift_init(void)
507 rc = proto_register(&swift_prot, 1);
509 log_error("Error registering swift protocol\n");
513 rc = inet_add_protocol(&swift_protocol, IPPROTO_SWIFT);
515 log_error("Error adding swift protocol\n");
519 inet_register_protosw(&swift_protosw);
520 log_debug("Swift entered\n");
525 proto_unregister(&swift_prot);
531 static void __exit swift_exit(void)
533 inet_unregister_protosw(&swift_protosw);
535 inet_del_protocol(&swift_protocol, IPPROTO_SWIFT);
537 proto_unregister(&swift_prot);
539 log_debug("Swift exited\n");
542 module_init(swift_init);
543 module_exit(swift_exit);