X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fnet%2Fpppol2tp.c;h=f9298827a76caa07f8508d4179b9b312cf13fb72;hb=5b97d3ec6732c87741b2fc04f2956f097a458818;hp=8db342f2fdc978b667e0f40dfde5b7a3141c33e6;hpb=c2448278e3be3a43fe0343e138444742af1e99ae;p=linux-2.6-omap-h63xx.git diff --git a/drivers/net/pppol2tp.c b/drivers/net/pppol2tp.c index 8db342f2fdc..f9298827a76 100644 --- a/drivers/net/pppol2tp.c +++ b/drivers/net/pppol2tp.c @@ -240,12 +240,15 @@ static inline struct pppol2tp_session *pppol2tp_sock_to_session(struct sock *sk) if (sk == NULL) return NULL; + sock_hold(sk); session = (struct pppol2tp_session *)(sk->sk_user_data); - if (session == NULL) - return NULL; + if (session == NULL) { + sock_put(sk); + goto out; + } BUG_ON(session->magic != L2TP_SESSION_MAGIC); - +out: return session; } @@ -256,12 +259,15 @@ static inline struct pppol2tp_tunnel *pppol2tp_sock_to_tunnel(struct sock *sk) if (sk == NULL) return NULL; + sock_hold(sk); tunnel = (struct pppol2tp_tunnel *)(sk->sk_user_data); - if (tunnel == NULL) - return NULL; + if (tunnel == NULL) { + sock_put(sk); + goto out; + } BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); - +out: return tunnel; } @@ -716,12 +722,14 @@ discard: session->stats.rx_errors++; kfree_skb(skb); sock_put(session->sock); + sock_put(sock); return 0; error: /* Put UDP header back */ __skb_push(skb, sizeof(struct udphdr)); + sock_put(sock); no_tunnel: return 1; @@ -745,10 +753,13 @@ static int pppol2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) "%s: received %d bytes\n", tunnel->name, skb->len); if (pppol2tp_recv_core(sk, skb)) - goto pass_up; + goto pass_up_put; + sock_put(sk); return 0; +pass_up_put: + sock_put(sk); pass_up: return 1; } @@ -772,14 +783,18 @@ static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock, err = 0; skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &err); - if (skb) { - err = memcpy_toiovec(msg->msg_iov, (unsigned char *) skb->data, - skb->len); - if (err < 0) - goto do_skb_free; - err = skb->len; - } -do_skb_free: + if (!skb) + goto end; + + if (len > skb->len) + len = skb->len; + else if (len < skb->len) + msg->msg_flags |= MSG_TRUNC; + + err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); + if (likely(err == 0)) + err = len; + kfree_skb(skb); end: return err; @@ -858,7 +873,7 @@ static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msgh tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); if (tunnel == NULL) - goto error; + goto error_put_sess; /* What header length is configured for this session? */ hdr_len = pppol2tp_l2tp_header_len(session); @@ -870,7 +885,7 @@ static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msgh sizeof(ppph) + total_len, 0, GFP_KERNEL); if (!skb) - goto error; + goto error_put_sess_tun; /* Reserve space for headers. */ skb_reserve(skb, NET_SKB_PAD); @@ -900,7 +915,7 @@ static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msgh error = memcpy_fromiovec(skb->data, m->msg_iov, total_len); if (error < 0) { kfree_skb(skb); - goto error; + goto error_put_sess_tun; } skb_put(skb, total_len); @@ -947,10 +962,33 @@ static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msgh session->stats.tx_errors++; } + return error; + +error_put_sess_tun: + sock_put(session->tunnel_sock); +error_put_sess: + sock_put(sk); error: return error; } +/* Automatically called when the skb is freed. + */ +static void pppol2tp_sock_wfree(struct sk_buff *skb) +{ + sock_put(skb->sk); +} + +/* For data skbs that we transmit, we associate with the tunnel socket + * but don't do accounting. + */ +static inline void pppol2tp_skb_set_owner_w(struct sk_buff *skb, struct sock *sk) +{ + sock_hold(sk); + skb->sk = sk; + skb->destructor = pppol2tp_sock_wfree; +} + /* Transmit function called by generic PPP driver. Sends PPP frame * over PPPoL2TP socket. * @@ -993,10 +1031,10 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) sk_tun = session->tunnel_sock; if (sk_tun == NULL) - goto abort; + goto abort_put_sess; tunnel = pppol2tp_sock_to_tunnel(sk_tun); if (tunnel == NULL) - goto abort; + goto abort_put_sess; /* What header length is configured for this session? */ hdr_len = pppol2tp_l2tp_header_len(session); @@ -1009,7 +1047,7 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) sizeof(struct udphdr) + hdr_len + sizeof(ppph); old_headroom = skb_headroom(skb); if (skb_cow_head(skb, headroom)) - goto abort; + goto abort_put_sess_tun; new_headroom = skb_headroom(skb); skb_orphan(skb); @@ -1069,7 +1107,7 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) /* Get routing info from the tunnel socket */ dst_release(skb->dst); skb->dst = dst_clone(__sk_dst_get(sk_tun)); - skb->sk = sk_tun; + pppol2tp_skb_set_owner_w(skb, sk_tun); /* Queue the packet to IP for output */ len = skb->len; @@ -1086,8 +1124,14 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) session->stats.tx_errors++; } + sock_put(sk_tun); + sock_put(sk); return 1; +abort_put_sess_tun: + sock_put(sk_tun); +abort_put_sess: + sock_put(sk); abort: /* Free the original skb */ kfree_skb(skb); @@ -1191,7 +1235,7 @@ static void pppol2tp_tunnel_destruct(struct sock *sk) { struct pppol2tp_tunnel *tunnel; - tunnel = pppol2tp_sock_to_tunnel(sk); + tunnel = sk->sk_user_data; if (tunnel == NULL) goto end; @@ -1230,10 +1274,12 @@ static void pppol2tp_session_destruct(struct sock *sk) if (sk->sk_user_data != NULL) { struct pppol2tp_tunnel *tunnel; - session = pppol2tp_sock_to_session(sk); + session = sk->sk_user_data; if (session == NULL) goto out; + BUG_ON(session->magic != L2TP_SESSION_MAGIC); + /* Don't use pppol2tp_sock_to_tunnel() here to * get the tunnel context because the tunnel * socket might have already been closed (its @@ -1279,6 +1325,7 @@ out: static int pppol2tp_release(struct socket *sock) { struct sock *sk = sock->sk; + struct pppol2tp_session *session; int error; if (!sk) @@ -1296,9 +1343,18 @@ static int pppol2tp_release(struct socket *sock) sock_orphan(sk); sock->sk = NULL; + session = pppol2tp_sock_to_session(sk); + /* Purge any queued data */ skb_queue_purge(&sk->sk_receive_queue); skb_queue_purge(&sk->sk_write_queue); + if (session != NULL) { + struct sk_buff *skb; + while ((skb = skb_dequeue(&session->reorder_q))) { + kfree_skb(skb); + sock_put(sk); + } + } release_sock(sk); @@ -1601,7 +1657,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, error = ppp_register_channel(&po->chan); if (error) - goto end; + goto end_put_tun; /* This is how we get the session context from the socket. */ sk->sk_user_data = session; @@ -1621,6 +1677,8 @@ out_no_ppp: PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, "%s: created\n", session->name); +end_put_tun: + sock_put(tunnel_sock); end: release_sock(sk); @@ -1668,6 +1726,7 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, *usockaddr_len = len; error = 0; + sock_put(sock->sk); end: return error; @@ -1906,14 +1965,17 @@ static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, err = -EBADF; tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); if (tunnel == NULL) - goto end; + goto end_put_sess; err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); - goto end; + sock_put(session->tunnel_sock); + goto end_put_sess; } err = pppol2tp_session_ioctl(session, cmd, arg); +end_put_sess: + sock_put(sk); end: return err; } @@ -2059,14 +2121,17 @@ static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, err = -EBADF; tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); if (tunnel == NULL) - goto end; + goto end_put_sess; err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); + sock_put(session->tunnel_sock); } else err = pppol2tp_session_setsockopt(sk, session, optname, val); err = 0; +end_put_sess: + sock_put(sk); end: return err; } @@ -2181,20 +2246,24 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, err = -EBADF; tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); if (tunnel == NULL) - goto end; + goto end_put_sess; err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); + sock_put(session->tunnel_sock); } else err = pppol2tp_session_getsockopt(sk, session, optname, &val); err = -EFAULT; if (put_user(len, (int __user *) optlen)) - goto end; + goto end_put_sess; if (copy_to_user((void __user *) optval, &val, len)) - goto end; + goto end_put_sess; err = 0; + +end_put_sess: + sock_put(sk); end: return err; }