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,
140 int sockaddr_len){return 0;}
143 static int p2pkp_connect(struct socket *sock, struct sockaddr *vaddr,
144 int sockaddr_len, int flags)
146 struct sock *sk = sock->sk;
147 struct p2pkp_sock *ps = sock2p2pkp(sk);
148 struct p2pkp_conn_info *pconn;
150 if (!sk || !vaddr || sockaddr_len != sizeof(struct sockaddr_in) ||
151 vaddr->sa_family != AF_INET) {
152 ERROR("invalid socket parameters");
156 pconn = kmalloc(sizeof(struct p2pkp_conn_info), GFP_KERNEL);
158 ERROR("no more memory for new list element");
162 INIT_LIST_HEAD(&pconn->list);
163 memcpy(&pconn->sin, vaddr, sockaddr_len);
167 /* TODO spinlock required? */
168 list_add(&pconn->list, &ps->conn_list);
170 sock->state = SS_CONNECTED;
173 DEBUG("Connected socket to a peer");
178 static int p2pkp_sendmsg(struct kiocb *iocb, struct socket *sock,
179 struct msghdr *m, size_t total_len)
182 int f_index, bytes_read;
183 struct sock *sk = sock->sk;
184 struct p2pkp_sock *ps = sock2p2pkp(sk);
185 struct sockaddr_in *sin = (struct sockaddr_in *)m->msg_name;
188 struct list_head *pos;
189 struct p2pkp_conn_info *conn;
192 (sin && sizeof(struct sockaddr_in) != m->msg_namelen)) {
193 ERROR("invalid socket parameters");
197 if (sin && ((err = p2pkp_connect(sock, (struct sockaddr *)sin,
198 sizeof(struct sockaddr_in), 0)) < 0)) {
199 ERROR("cannot connect to socket");
204 if (!(sock->state & SS_CONNECTED)) {
205 ERROR("unconnected socket");
211 /* check if the file exists */
212 for (f_index = 0; f_index < m->msg_iovlen; f_index++) {
213 file_name = (char *)m->msg_iov[f_index].iov_base;
214 file = p2pkp_open_file_read(file_name);
216 ERROR("cannot open file %s\n", file_name);
219 DEBUG("opened file %s", file_name);
221 bytes_read = p2pkp_read_from_file(file, ps->buffer, ps->buffer_len);
222 DEBUG("read %d bytes from file", bytes_read);
223 if (bytes_read < 0) {
224 ERROR("cannot read from file");
231 /* iterate through all the connections to send the data */
232 list_for_each(pos, &ps->conn_list) {
234 conn = list_entry(pos, struct p2pkp_conn_info, list);
235 err = p2pkp_msgsend(ps->net_sock,
236 &conn->sin, ps->buffer, ps->buffer_len);
238 ERROR("can't send first message");
248 p2pkp_close_file(file);
252 DEBUG("Sending completed successfully");
260 static int p2pkp_recvmsg(struct kiocb *iocb, struct socket *sock,
261 struct msghdr *m, size_t total_len, int flags){return 0;}
264 static int p2pkp_create(struct net *net, struct socket *sock, int protocol,
267 struct sock *sk = NULL;
268 struct p2pkp_sock *ps;
269 int err = -ESOCKTNOSUPPORT;
271 DEBUG("Creating new P2PKP socket");
272 if (sock->type != SOCK_DGRAM) {
273 ERROR("P2PKP supports only SOCK_DGRAM sockets");
277 ERROR("protocol %x not suported - currently only 0 is supported",
282 sock->state = SS_UNCONNECTED;
285 sk = sk_alloc(net, PF_P2PKP, GFP_KERNEL, &p2pkp_proto);
287 ERROR("unable to create new socket");
291 sock->ops = &p2pkp_ops;
292 sock_init_data(sock, sk);
296 sk->sk_family = PF_P2PKP;
297 sk->sk_protocol = protocol;
298 sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
300 /* TODO init further data */
303 err = p2pkp_create_udp_sock(&ps->net_sock);
305 ERROR("cannot create UDP socket");
308 ps->buffer_len = P2PKP_DEFAULT_BUF_LEN;
310 INIT_LIST_HEAD(&ps->conn_list);
311 spin_lock_init(&ps->conn_lock);
313 DEBUG("Created new P2PKP socket");