2 #include <linux/list.h>
3 #include <linux/spinlock.h>
7 #include "p2pkp_sock.h"
8 #include "p2pkp_debug.h"
9 #include "p2pkp_file.h"
12 static int p2pkp_release(struct socket *sock);
13 static int p2pkp_bind(struct socket *sock, struct sockaddr *myaddr,
15 static int p2pkp_connect(struct socket *sock, struct sockaddr *vaddr,
16 int sockaddr_len, int flags);
17 static int p2pkp_sendmsg(struct kiocb *iocb, struct socket *sock,
18 struct msghdr *m, size_t total_len);
19 static int p2pkp_recvmsg(struct kiocb *iocb, struct socket *sock,
20 struct msghdr *m, size_t total_len, int flags);
22 /* creates a socket */
23 static int p2pkp_create(struct net *net, struct socket *sock, int protocol,
27 static struct proto p2pkp_proto = {
28 .name = P2PKP_PROTO_NAME,
30 .obj_size = sizeof(struct p2pkp_sock),
33 /* protocol operations */
34 static const struct proto_ops p2pkp_ops = {
37 .release = p2pkp_release,
39 .connect = p2pkp_connect,
40 .sendmsg = p2pkp_sendmsg,
41 .recvmsg = p2pkp_recvmsg,
44 .poll = datagram_poll,
45 .socketpair = sock_no_socketpair,
46 .accept = sock_no_accept,
47 .getname = sock_no_getname,
48 .ioctl = sock_no_ioctl,
49 .listen = sock_no_listen,
50 .shutdown = sock_no_shutdown,
51 .setsockopt = sock_no_setsockopt,
52 .getsockopt = sock_no_getsockopt,
54 .sendpage = sock_no_sendpage,
59 static const struct net_proto_family p2pkp_family_ops = {
61 .create = p2pkp_create,
67 int p2pkp_register_protocol(void)
71 err = sock_register(&p2pkp_family_ops);
73 ERROR("cannot register operations");
77 err = proto_register(&p2pkp_proto, 0);
79 ERROR("cannot register proto");
82 DEBUG("Successfully registered socket operations");
87 sock_unregister(PF_P2PKP);
93 void p2pkp_unregister_protocol(void)
95 DEBUG("Unregistering protocol");
96 proto_unregister(&p2pkp_proto);
97 sock_unregister(PF_P2PKP);
98 DEBUG("Successfully UNregistered socket operations");
102 static int p2pkp_release(struct socket *sock)
104 struct sock *sk = sock->sk;
105 struct p2pkp_sock *ps = sock2p2pkp(sk);
112 sk->sk_shutdown = SEND_SHUTDOWN;
114 skb_queue_purge(&sk->sk_receive_queue);
115 skb_queue_purge(&sk->sk_write_queue);
116 skb_queue_purge(&sk->sk_error_queue);
118 /* TODO: some statistics, don't know if really
120 //sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
122 /* TODO do whatever is needed with ps */
124 if (!sock_flag(sk, SOCK_DEAD))
125 sk->sk_state_change(sk);
129 sock_set_flag(sk, SOCK_DEAD);
132 p2pkp_destroy_udp_sock(ps->net_sock);
135 DEBUG("Released the socket");
139 static int p2pkp_bind(struct socket *sock, struct sockaddr *myaddr,
142 struct sock *sk = sock->sk;
143 struct p2pkp_sock *ps = sock2p2pkp(sk);
144 struct sockaddr_in *sin = (struct sockaddr_in *)myaddr;
147 if (!sock || !myaddr || sockaddr_len != sizeof(struct sockaddr_in) ||
148 sin->sin_family != AF_INET) {
149 ERROR("invalid parameters for bind");
154 err = ps->net_sock->ops->bind(ps->net_sock, myaddr, sockaddr_len);
156 ERROR("can't bind socket");
163 static int p2pkp_connect(struct socket *sock, struct sockaddr *vaddr,
164 int sockaddr_len, int flags)
166 struct sock *sk = sock->sk;
167 struct p2pkp_sock *ps = sock2p2pkp(sk);
168 struct p2pkp_conn_info *pconn;
170 if (!sk || !vaddr || sockaddr_len != sizeof(struct sockaddr_in) ||
171 vaddr->sa_family != AF_INET) {
172 ERROR("invalid socket parameters");
176 pconn = kmalloc(sizeof(struct p2pkp_conn_info), GFP_KERNEL);
178 ERROR("no more memory for new list element");
182 INIT_LIST_HEAD(&pconn->list);
183 memcpy(&pconn->sin, vaddr, sockaddr_len);
187 /* TODO spinlock required? */
188 list_add(&pconn->list, &ps->conn_list);
190 sock->state = SS_CONNECTED;
193 DEBUG("Connected socket to a peer");
198 static int p2pkp_sendmsg(struct kiocb *iocb, struct socket *sock,
199 struct msghdr *m, size_t total_len)
202 int f_index, bytes_read, files_no = 0;
203 struct sock *sk = sock->sk;
204 struct p2pkp_sock *ps = sock2p2pkp(sk);
205 struct sockaddr_in *sin = (struct sockaddr_in *)m->msg_name;
208 struct list_head *pos;
209 struct p2pkp_conn_info *conn;
212 (sin && sizeof(struct sockaddr_in) != m->msg_namelen)) {
213 ERROR("invalid socket parameters");
217 if (sin && ((err = p2pkp_connect(sock, (struct sockaddr *)sin,
218 sizeof(struct sockaddr_in), 0)) < 0)) {
219 ERROR("cannot connect to socket");
224 if (!(sock->state & SS_CONNECTED)) {
225 ERROR("unconnected socket");
231 /* check if the file exists */
232 for (f_index = 0; f_index < m->msg_iovlen; f_index++) {
234 file_name = (char *)m->msg_iov[f_index].iov_base;
235 file = p2pkp_open_file_read(file_name);
237 ERROR("cannot open file %s\n", file_name);
241 DEBUG("opened file %s", file_name);
243 bytes_read = p2pkp_read_from_file(file, ps->buffer, ps->buffer_len);
244 DEBUG("read %d bytes from file", bytes_read);
245 if (bytes_read < 0) {
246 ERROR("cannot read from file");
254 /* iterate through all the connections to send the data */
255 list_for_each(pos, &ps->conn_list) {
257 conn = list_entry(pos, struct p2pkp_conn_info, list);
258 err = p2pkp_msgsend(ps->net_sock, &conn->sin,
259 ps->buffer, bytes_read);
261 ERROR("can't send first message");
272 p2pkp_close_file(file);
275 DEBUG("Sending completed successfully");
278 return err ? err : files_no;
282 static int p2pkp_recvmsg(struct kiocb *iocb, struct socket *sock,
283 struct msghdr *m, size_t total_len, int flags)
286 int bytes_read, bytes_written;
287 struct sock *sk = sock->sk;
288 struct p2pkp_sock *ps = sock2p2pkp(sk);
289 struct sockaddr_in *sin = (struct sockaddr_in *)m->msg_name;
291 char *file_name = (char *)m->msg_iov[0].iov_base;
292 mode_t mode = P2PKP_DEFAULT_MODE;
294 /* first try to get some files */
295 if (!sock || !m || !file_name) {
296 ERROR("invalid socket parameters");
300 file = p2pkp_open_file_write(file_name, mode);
302 ERROR("cannot open file %s\n", file_name);
307 /* TODO keep connections */
308 bytes_read = p2pkp_msgrecv(ps->net_sock, sin, ps->buffer, ps->buffer_len);
309 DEBUG("XXX: received %d bytes\n", bytes_read);
310 if (bytes_read > 0) {
311 bytes_written = p2pkp_write_in_file(file, ps->buffer, bytes_read);
313 } else if (bytes_read < 0) {
314 ERROR("cannot read data");
318 p2pkp_close_file(file);
320 return err ? err : bytes_written;
324 static int p2pkp_create(struct net *net, struct socket *sock, int protocol,
327 struct sock *sk = NULL;
328 struct p2pkp_sock *ps;
329 int err = -ESOCKTNOSUPPORT;
331 DEBUG("Creating new P2PKP socket");
332 if (sock->type != SOCK_DGRAM) {
333 ERROR("P2PKP supports only SOCK_DGRAM sockets");
337 ERROR("protocol %x not suported - currently only 0 is supported",
342 sock->state = SS_UNCONNECTED;
345 sk = sk_alloc(net, PF_P2PKP, GFP_KERNEL, &p2pkp_proto);
347 ERROR("unable to create new socket");
351 sock->ops = &p2pkp_ops;
352 sock_init_data(sock, sk);
356 sk->sk_family = PF_P2PKP;
357 sk->sk_protocol = protocol;
358 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
360 /* TODO init further data */
363 err = p2pkp_create_udp_sock(&ps->net_sock);
365 ERROR("cannot create UDP socket");
368 ps->buffer_len = P2PKP_DEFAULT_BUF_LEN;
370 INIT_LIST_HEAD(&ps->conn_list);
371 spin_lock_init(&ps->conn_lock);
373 DEBUG("Created new P2PKP socket");