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 if (unlikely(swift_addr->sin_family != AF_INET)) {
99 log_error("Invalid family for sockaddr\n");
104 port = ntohs(swift_addr->sin_port);
106 if (unlikely(port == 0 || port >= MAX_SWIFT_PORT)) {
107 log_error("Invalid value for sockaddr port (%u)\n", port);
112 if (unlikely(swift_lookup(port) != NULL)) {
113 log_error("Port %u already in use\n", port);
118 ssk = swift_sk(sock->sk);
121 swift_hash(port, ssk);
123 log_debug("Socket %p bound to port %u\n", ssk, port);
131 static int swift_connect(struct socket *sock, struct sockaddr *addr, int addr_len, int flags)
135 struct inet_sock * isk;
136 struct swift_sock * ssk;
138 log_debug("swift_connect\n");
140 if (unlikely(sock == NULL)) {
141 log_error("Sock is NULL\n");
147 if (unlikely(sk == NULL)) {
148 log_error("Sock->sk is NULL\n");
156 if (unlikely(ssk->src != 0)) {
157 log_error("ssk->src is not NULL\n");
163 struct sockaddr_swift * swift_addr = (struct sockaddr_swift *) addr;
165 if (unlikely(addr_len < sizeof(*swift_addr) || swift_addr->sin_family != AF_INET)) {
166 log_error("Invalid size or address family\n");
170 ssk->dst = ntohs(swift_addr->sin_port);
171 if (unlikely(ssk->dst == 0 || ssk->dst >= MAX_SWIFT_PORT)) {
172 log_error("Invalid value for destination port(%u)\n", ssk->dst);
177 isk->inet_daddr = swift_addr->sin_addr.s_addr;
178 log_debug("Received from user space destination port=%u and address=%u\n", ssk->dst, isk->inet_daddr);
180 log_error("Invalid swift_addr (NULL)\n");
185 ssk->src = get_next_free_port();
186 if (unlikely(ssk->src == 0)) {
187 log_error("No free ports\n");
192 swift_hash(ssk->src, ssk);
200 static int swift_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
206 struct sk_buff * skb;
208 struct inet_sock * isk;
209 struct swift_sock * ssk;
210 struct swifthdr * shdr;
213 struct rtable * rt = NULL;
215 if (unlikely(sock == NULL)) {
216 log_error("Sock is NULL\n");
222 if (unlikely(sk == NULL)) {
223 log_error("Sock->sk is NULL\n");
233 sport = get_next_free_port();
234 if (unlikely(sport == 0)) {
235 log_error("No free ports\n");
242 struct sockaddr_swift * swift_addr = (struct sockaddr_swift *) msg->msg_name;
244 if (unlikely(msg->msg_namelen < sizeof(*swift_addr) || swift_addr->sin_family != AF_INET)) {
245 log_error("Invalid size or address family\n");
250 dport = ntohs(swift_addr->sin_port);
251 if (unlikely(dport == 0 || dport >= MAX_SWIFT_PORT)) {
252 log_error("Invalid value for destination port(%u)\n", dport);
257 daddr = swift_addr->sin_addr.s_addr;
258 log_debug("Received from user space destination port=%u and address=%u\n", dport, daddr);
260 if (unlikely(!ssk->dst || !isk->inet_daddr)) {
261 log_error("No destination port/address\n");
266 daddr = isk->inet_daddr;
268 log_debug("Got from socket destination port=%u and address=%u\n", dport, daddr);
272 totlen = len + sizeof(struct swifthdr) + sizeof(struct iphdr);
273 skb = sock_alloc_send_skb(sk, totlen, msg->msg_flags & MSG_DONTWAIT, &err);
274 if (unlikely(!skb)) {
275 log_error("sock_alloc_send_skb failed\n");
278 log_debug("Allocated %u bytes for skb (payload size=%u)\n", totlen, len);
280 skb_reset_network_header(skb);
281 skb_reserve(skb, sizeof(struct iphdr));
282 log_debug("Reseted network header\n");
283 skb_reset_transport_header(skb);
284 skb_put(skb, sizeof(struct swifthdr));
285 log_debug("Reseted transport header\n");
287 shdr = (struct swifthdr *) skb_transport_header(skb);
288 shdr->dst = ntohs(dport);
289 shdr->src = ntohs(sport);
290 shdr->len = ntohs(len + sizeof(struct swifthdr));
292 log_debug("payload=%p\n", skb_put(skb, len));
294 err = skb_copy_datagram_from_iovec(skb, sizeof(struct swifthdr), msg->msg_iov, 0, len);
296 log_error("skb_copy_datagram_from_iovec failed\n");
299 log_debug("Copied %u bytes into the skb\n", len);
302 rt = (struct rtable *) __sk_dst_check(sk, 0);
305 struct flowi fl = { .fl4_dst = daddr,
306 .proto = sk->sk_protocol,
307 .flags = inet_sk_flowi_flags(sk),
309 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
311 log_error("Route lookup failed\n");
314 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
315 sk_dst_set(sk, dst_clone(&rt->u.dst));
317 sk_dst_set(sk, dst_clone(&rt->dst));
321 err = ip_queue_xmit(skb);
323 log_debug("Sent %u bytes on wire\n", len);
325 log_error("ip_queue_xmit failed\n");
336 static int swift_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
339 struct sockaddr_swift *swift_addr;
340 struct sock * sk = sock->sk;
343 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
344 if (unlikely(!skb)) {
345 log_error("skb_recv_datagram\n");
349 log_debug("Received skb %p\n", skb);
351 swift_addr = (struct sockaddr_swift *) skb->cb;
352 msg->msg_namelen = sizeof(struct sockaddr_swift);
357 msg->msg_flags |= MSG_TRUNC;
360 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
362 log_error("skb_copy_datagram_iovec\n");
366 sock_recv_ts_and_drops(msg, sk, skb);
369 memcpy(msg->msg_name, swift_addr, msg->msg_namelen);
374 skb_free_datagram(sk, skb);
380 static int swift_rcv(struct sk_buff *skb)
382 struct swifthdr *shdr;
383 struct swift_sock *ssk;
386 struct sockaddr_swift * swift_addr;
389 if (unlikely(!pskb_may_pull(skb, sizeof(struct swifthdr)))) {
390 log_error("Insufficient space for header\n");
394 shdr = (struct swifthdr *) skb->data;
395 len = ntohs(shdr->len);
397 if (unlikely(skb->len < len)) {
398 log_error("Malformed packet (packet_len=%u, skb_len=%u)\n", len, skb->len);
402 if (unlikely(len < sizeof(struct swifthdr))) {
403 log_error("Malformed packet (packet_len=%u sizeof(swifthdr)=%u\n", len, sizeof(struct swifthdr));
407 src = ntohs(shdr->src);
408 dst = ntohs(shdr->dst);
409 if (unlikely(src == 0 || dst == 0 || src >= MAX_SWIFT_PORT || dst >= MAX_SWIFT_PORT)) {
410 log_error("Malformed packet (src=%u, dst=%u)\n", shdr->src, shdr->dst);
414 skb_pull(skb, sizeof(struct swifthdr));
415 len -= sizeof(struct swifthdr);
419 log_debug("Received %u bytes from from port=%u to port=%u\n", len - sizeof(struct swifthdr), src, dst);
421 ssk = swift_lookup(dst);
423 log_error("Swift lookup failed for port %u\n", dst);
427 BUILD_BUG_ON(sizeof(struct sockaddr_swift) > sizeof(skb->cb));
429 swift_addr = (struct sockaddr_swift *) skb->cb;
430 swift_addr->sin_family = AF_INET;
431 swift_addr->sin_port = shdr->src;
432 swift_addr->sin_addr.s_addr = ip_hdr(skb)->saddr;
434 log_debug("Setting sin_port=%u, sin_addr=%u\n", ntohs(shdr->src), swift_addr->sin_addr.s_addr);
436 err = ip_queue_rcv_skb((struct sock *) &ssk->sock, skb);
438 log_error("ip_queu_rcv_skb\n");
441 return NET_RX_SUCCESS;
448 static struct proto swift_prot = {
449 .obj_size = sizeof(struct swift_sock),
450 .owner = THIS_MODULE,
454 static const struct proto_ops swift_ops = {
456 .owner = THIS_MODULE,
457 .release = swift_release,
459 .connect = swift_connect,
460 .socketpair = sock_no_socketpair,
461 .accept = sock_no_accept,
462 .getname = sock_no_getname,
463 .poll = datagram_poll,
464 .ioctl = sock_no_ioctl,
465 .listen = sock_no_listen,
466 .shutdown = sock_no_shutdown,
467 .setsockopt = sock_no_setsockopt,
468 .getsockopt = sock_no_getsockopt,
469 .sendmsg = swift_sendmsg,
470 .recvmsg = swift_recvmsg,
471 .mmap = sock_no_mmap,
472 .sendpage = sock_no_sendpage,
475 static const struct net_protocol swift_protocol = {
476 .handler = swift_rcv,
481 static struct inet_protosw swift_protosw = {
483 .protocol = IPPROTO_SWIFT,
489 static int __init swift_init(void)
493 rc = proto_register(&swift_prot, 1);
495 log_error("Error registering swift protocol\n");
499 rc = inet_add_protocol(&swift_protocol, IPPROTO_SWIFT);
501 log_error("Error adding swift protocol\n");
505 inet_register_protosw(&swift_protosw);
506 log_debug("Swift entered\n");
511 proto_unregister(&swift_prot);
517 static void __exit swift_exit(void)
519 inet_unregister_protosw(&swift_protosw);
521 inet_del_protocol(&swift_protocol, IPPROTO_SWIFT);
523 proto_unregister(&swift_prot);
525 log_debug("Swift exited\n");
528 module_init(swift_init);
529 module_exit(swift_exit);