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path: root/ANDROID_3.4.5/drivers/net/ppp/pppolac.c
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Diffstat (limited to 'ANDROID_3.4.5/drivers/net/ppp/pppolac.c')
-rw-r--r--ANDROID_3.4.5/drivers/net/ppp/pppolac.c449
1 files changed, 0 insertions, 449 deletions
diff --git a/ANDROID_3.4.5/drivers/net/ppp/pppolac.c b/ANDROID_3.4.5/drivers/net/ppp/pppolac.c
deleted file mode 100644
index a5d3d634..00000000
--- a/ANDROID_3.4.5/drivers/net/ppp/pppolac.c
+++ /dev/null
@@ -1,449 +0,0 @@
-/* drivers/net/pppolac.c
- *
- * Driver for PPP on L2TP Access Concentrator / PPPoLAC Socket (RFC 2661)
- *
- * Copyright (C) 2009 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-/* This driver handles L2TP data packets between a UDP socket and a PPP channel.
- * The socket must keep connected, and only one session per socket is permitted.
- * Sequencing of outgoing packets is controlled by LNS. Incoming packets with
- * sequences are reordered within a sliding window of one second. Currently
- * reordering only happens when a packet is received. It is done for simplicity
- * since no additional locks or threads are required. This driver only works on
- * IPv4 due to the lack of UDP encapsulation support in IPv6. */
-
-#include <linux/module.h>
-#include <linux/jiffies.h>
-#include <linux/workqueue.h>
-#include <linux/skbuff.h>
-#include <linux/file.h>
-#include <linux/netdevice.h>
-#include <linux/net.h>
-#include <linux/udp.h>
-#include <linux/ppp_defs.h>
-#include <linux/if_ppp.h>
-#include <linux/if_pppox.h>
-#include <linux/ppp_channel.h>
-#include <net/tcp_states.h>
-#include <asm/uaccess.h>
-
-#define L2TP_CONTROL_BIT 0x80
-#define L2TP_LENGTH_BIT 0x40
-#define L2TP_SEQUENCE_BIT 0x08
-#define L2TP_OFFSET_BIT 0x02
-#define L2TP_VERSION 0x02
-#define L2TP_VERSION_MASK 0x0F
-
-#define PPP_ADDR 0xFF
-#define PPP_CTRL 0x03
-
-union unaligned {
- __u32 u32;
-} __attribute__((packed));
-
-static inline union unaligned *unaligned(void *ptr)
-{
- return (union unaligned *)ptr;
-}
-
-struct meta {
- __u32 sequence;
- __u32 timestamp;
-};
-
-static inline struct meta *skb_meta(struct sk_buff *skb)
-{
- return (struct meta *)skb->cb;
-}
-
-/******************************************************************************/
-
-static int pppolac_recv_core(struct sock *sk_udp, struct sk_buff *skb)
-{
- struct sock *sk = (struct sock *)sk_udp->sk_user_data;
- struct pppolac_opt *opt = &pppox_sk(sk)->proto.lac;
- struct meta *meta = skb_meta(skb);
- __u32 now = jiffies;
- __u8 bits;
- __u8 *ptr;
-
- /* Drop the packet if L2TP header is missing. */
- if (skb->len < sizeof(struct udphdr) + 6)
- goto drop;
-
- /* Put it back if it is a control packet. */
- if (skb->data[sizeof(struct udphdr)] & L2TP_CONTROL_BIT)
- return opt->backlog_rcv(sk_udp, skb);
-
- /* Skip UDP header. */
- skb_pull(skb, sizeof(struct udphdr));
-
- /* Check the version. */
- if ((skb->data[1] & L2TP_VERSION_MASK) != L2TP_VERSION)
- goto drop;
- bits = skb->data[0];
- ptr = &skb->data[2];
-
- /* Check the length if it is present. */
- if (bits & L2TP_LENGTH_BIT) {
- if ((ptr[0] << 8 | ptr[1]) != skb->len)
- goto drop;
- ptr += 2;
- }
-
- /* Skip all fields including optional ones. */
- if (!skb_pull(skb, 6 + (bits & L2TP_SEQUENCE_BIT ? 4 : 0) +
- (bits & L2TP_LENGTH_BIT ? 2 : 0) +
- (bits & L2TP_OFFSET_BIT ? 2 : 0)))
- goto drop;
-
- /* Skip the offset padding if it is present. */
- if (bits & L2TP_OFFSET_BIT &&
- !skb_pull(skb, skb->data[-2] << 8 | skb->data[-1]))
- goto drop;
-
- /* Check the tunnel and the session. */
- if (unaligned(ptr)->u32 != opt->local)
- goto drop;
-
- /* Check the sequence if it is present. */
- if (bits & L2TP_SEQUENCE_BIT) {
- meta->sequence = ptr[4] << 8 | ptr[5];
- if ((__s16)(meta->sequence - opt->recv_sequence) < 0)
- goto drop;
- }
-
- /* Skip PPP address and control if they are present. */
- if (skb->len >= 2 && skb->data[0] == PPP_ADDR &&
- skb->data[1] == PPP_CTRL)
- skb_pull(skb, 2);
-
- /* Fix PPP protocol if it is compressed. */
- if (skb->len >= 1 && skb->data[0] & 1)
- skb_push(skb, 1)[0] = 0;
-
- /* Drop the packet if PPP protocol is missing. */
- if (skb->len < 2)
- goto drop;
-
- /* Perform reordering if sequencing is enabled. */
- atomic_set(&opt->sequencing, bits & L2TP_SEQUENCE_BIT);
- if (bits & L2TP_SEQUENCE_BIT) {
- struct sk_buff *skb1;
-
- /* Insert the packet into receive queue in order. */
- skb_set_owner_r(skb, sk);
- skb_queue_walk(&sk->sk_receive_queue, skb1) {
- struct meta *meta1 = skb_meta(skb1);
- __s16 order = meta->sequence - meta1->sequence;
- if (order == 0)
- goto drop;
- if (order < 0) {
- meta->timestamp = meta1->timestamp;
- skb_insert(skb1, skb, &sk->sk_receive_queue);
- skb = NULL;
- break;
- }
- }
- if (skb) {
- meta->timestamp = now;
- skb_queue_tail(&sk->sk_receive_queue, skb);
- }
-
- /* Remove packets from receive queue as long as
- * 1. the receive buffer is full,
- * 2. they are queued longer than one second, or
- * 3. there are no missing packets before them. */
- skb_queue_walk_safe(&sk->sk_receive_queue, skb, skb1) {
- meta = skb_meta(skb);
- if (atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf &&
- now - meta->timestamp < HZ &&
- meta->sequence != opt->recv_sequence)
- break;
- skb_unlink(skb, &sk->sk_receive_queue);
- opt->recv_sequence = (__u16)(meta->sequence + 1);
- skb_orphan(skb);
- ppp_input(&pppox_sk(sk)->chan, skb);
- }
- return NET_RX_SUCCESS;
- }
-
- /* Flush receive queue if sequencing is disabled. */
- skb_queue_purge(&sk->sk_receive_queue);
- skb_orphan(skb);
- ppp_input(&pppox_sk(sk)->chan, skb);
- return NET_RX_SUCCESS;
-drop:
- kfree_skb(skb);
- return NET_RX_DROP;
-}
-
-static int pppolac_recv(struct sock *sk_udp, struct sk_buff *skb)
-{
- sock_hold(sk_udp);
- sk_receive_skb(sk_udp, skb, 0);
- return 0;
-}
-
-static struct sk_buff_head delivery_queue;
-
-static void pppolac_xmit_core(struct work_struct *delivery_work)
-{
- mm_segment_t old_fs = get_fs();
- struct sk_buff *skb;
-
- set_fs(KERNEL_DS);
- while ((skb = skb_dequeue(&delivery_queue))) {
- struct sock *sk_udp = skb->sk;
- struct kvec iov = {.iov_base = skb->data, .iov_len = skb->len};
- struct msghdr msg = {
- .msg_iov = (struct iovec *)&iov,
- .msg_iovlen = 1,
- .msg_flags = MSG_NOSIGNAL | MSG_DONTWAIT,
- };
- sk_udp->sk_prot->sendmsg(NULL, sk_udp, &msg, skb->len);
- kfree_skb(skb);
- }
- set_fs(old_fs);
-}
-
-static DECLARE_WORK(delivery_work, pppolac_xmit_core);
-
-static int pppolac_xmit(struct ppp_channel *chan, struct sk_buff *skb)
-{
- struct sock *sk_udp = (struct sock *)chan->private;
- struct pppolac_opt *opt = &pppox_sk(sk_udp->sk_user_data)->proto.lac;
-
- /* Install PPP address and control. */
- skb_push(skb, 2);
- skb->data[0] = PPP_ADDR;
- skb->data[1] = PPP_CTRL;
-
- /* Install L2TP header. */
- if (atomic_read(&opt->sequencing)) {
- skb_push(skb, 10);
- skb->data[0] = L2TP_SEQUENCE_BIT;
- skb->data[6] = opt->xmit_sequence >> 8;
- skb->data[7] = opt->xmit_sequence;
- skb->data[8] = 0;
- skb->data[9] = 0;
- opt->xmit_sequence++;
- } else {
- skb_push(skb, 6);
- skb->data[0] = 0;
- }
- skb->data[1] = L2TP_VERSION;
- unaligned(&skb->data[2])->u32 = opt->remote;
-
- /* Now send the packet via the delivery queue. */
- skb_set_owner_w(skb, sk_udp);
- skb_queue_tail(&delivery_queue, skb);
- schedule_work(&delivery_work);
- return 1;
-}
-
-/******************************************************************************/
-
-static struct ppp_channel_ops pppolac_channel_ops = {
- .start_xmit = pppolac_xmit,
-};
-
-static int pppolac_connect(struct socket *sock, struct sockaddr *useraddr,
- int addrlen, int flags)
-{
- struct sock *sk = sock->sk;
- struct pppox_sock *po = pppox_sk(sk);
- struct sockaddr_pppolac *addr = (struct sockaddr_pppolac *)useraddr;
- struct socket *sock_udp = NULL;
- struct sock *sk_udp;
- int error;
-
- if (addrlen != sizeof(struct sockaddr_pppolac) ||
- !addr->local.tunnel || !addr->local.session ||
- !addr->remote.tunnel || !addr->remote.session) {
- return -EINVAL;
- }
-
- lock_sock(sk);
- error = -EALREADY;
- if (sk->sk_state != PPPOX_NONE)
- goto out;
-
- sock_udp = sockfd_lookup(addr->udp_socket, &error);
- if (!sock_udp)
- goto out;
- sk_udp = sock_udp->sk;
- lock_sock(sk_udp);
-
- /* Remove this check when IPv6 supports UDP encapsulation. */
- error = -EAFNOSUPPORT;
- if (sk_udp->sk_family != AF_INET)
- goto out;
- error = -EPROTONOSUPPORT;
- if (sk_udp->sk_protocol != IPPROTO_UDP)
- goto out;
- error = -EDESTADDRREQ;
- if (sk_udp->sk_state != TCP_ESTABLISHED)
- goto out;
- error = -EBUSY;
- if (udp_sk(sk_udp)->encap_type || sk_udp->sk_user_data)
- goto out;
- if (!sk_udp->sk_bound_dev_if) {
- struct dst_entry *dst = sk_dst_get(sk_udp);
- error = -ENODEV;
- if (!dst)
- goto out;
- sk_udp->sk_bound_dev_if = dst->dev->ifindex;
- dst_release(dst);
- }
-
- po->chan.hdrlen = 12;
- po->chan.private = sk_udp;
- po->chan.ops = &pppolac_channel_ops;
- po->chan.mtu = PPP_MRU - 80;
- po->proto.lac.local = unaligned(&addr->local)->u32;
- po->proto.lac.remote = unaligned(&addr->remote)->u32;
- atomic_set(&po->proto.lac.sequencing, 1);
- po->proto.lac.backlog_rcv = sk_udp->sk_backlog_rcv;
-
- error = ppp_register_channel(&po->chan);
- if (error)
- goto out;
-
- sk->sk_state = PPPOX_CONNECTED;
- udp_sk(sk_udp)->encap_type = UDP_ENCAP_L2TPINUDP;
- udp_sk(sk_udp)->encap_rcv = pppolac_recv;
- sk_udp->sk_backlog_rcv = pppolac_recv_core;
- sk_udp->sk_user_data = sk;
-out:
- if (sock_udp) {
- release_sock(sk_udp);
- if (error)
- sockfd_put(sock_udp);
- }
- release_sock(sk);
- return error;
-}
-
-static int pppolac_release(struct socket *sock)
-{
- struct sock *sk = sock->sk;
-
- if (!sk)
- return 0;
-
- lock_sock(sk);
- if (sock_flag(sk, SOCK_DEAD)) {
- release_sock(sk);
- return -EBADF;
- }
-
- if (sk->sk_state != PPPOX_NONE) {
- struct sock *sk_udp = (struct sock *)pppox_sk(sk)->chan.private;
- lock_sock(sk_udp);
- skb_queue_purge(&sk->sk_receive_queue);
- pppox_unbind_sock(sk);
- udp_sk(sk_udp)->encap_type = 0;
- udp_sk(sk_udp)->encap_rcv = NULL;
- sk_udp->sk_backlog_rcv = pppox_sk(sk)->proto.lac.backlog_rcv;
- sk_udp->sk_user_data = NULL;
- release_sock(sk_udp);
- sockfd_put(sk_udp->sk_socket);
- }
-
- sock_orphan(sk);
- sock->sk = NULL;
- release_sock(sk);
- sock_put(sk);
- return 0;
-}
-
-/******************************************************************************/
-
-static struct proto pppolac_proto = {
- .name = "PPPOLAC",
- .owner = THIS_MODULE,
- .obj_size = sizeof(struct pppox_sock),
-};
-
-static struct proto_ops pppolac_proto_ops = {
- .family = PF_PPPOX,
- .owner = THIS_MODULE,
- .release = pppolac_release,
- .bind = sock_no_bind,
- .connect = pppolac_connect,
- .socketpair = sock_no_socketpair,
- .accept = sock_no_accept,
- .getname = sock_no_getname,
- .poll = sock_no_poll,
- .ioctl = pppox_ioctl,
- .listen = sock_no_listen,
- .shutdown = sock_no_shutdown,
- .setsockopt = sock_no_setsockopt,
- .getsockopt = sock_no_getsockopt,
- .sendmsg = sock_no_sendmsg,
- .recvmsg = sock_no_recvmsg,
- .mmap = sock_no_mmap,
-};
-
-static int pppolac_create(struct net *net, struct socket *sock)
-{
- struct sock *sk;
-
- sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppolac_proto);
- if (!sk)
- return -ENOMEM;
-
- sock_init_data(sock, sk);
- sock->state = SS_UNCONNECTED;
- sock->ops = &pppolac_proto_ops;
- sk->sk_protocol = PX_PROTO_OLAC;
- sk->sk_state = PPPOX_NONE;
- return 0;
-}
-
-/******************************************************************************/
-
-static struct pppox_proto pppolac_pppox_proto = {
- .create = pppolac_create,
- .owner = THIS_MODULE,
-};
-
-static int __init pppolac_init(void)
-{
- int error;
-
- error = proto_register(&pppolac_proto, 0);
- if (error)
- return error;
-
- error = register_pppox_proto(PX_PROTO_OLAC, &pppolac_pppox_proto);
- if (error)
- proto_unregister(&pppolac_proto);
- else
- skb_queue_head_init(&delivery_queue);
- return error;
-}
-
-static void __exit pppolac_exit(void)
-{
- unregister_pppox_proto(PX_PROTO_OLAC);
- proto_unregister(&pppolac_proto);
-}
-
-module_init(pppolac_init);
-module_exit(pppolac_exit);
-
-MODULE_DESCRIPTION("PPP on L2TP Access Concentrator (PPPoLAC)");
-MODULE_AUTHOR("Chia-chi Yeh <chiachi@android.com>");
-MODULE_LICENSE("GPL");