![Eric W Biederman](/assets/img/avatar_default.png)
While testing my netfilter changes I noticed several files where recompiling unncessarily because they unncessarily included netfilter.h. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
720 lines
16 KiB
C
720 lines
16 KiB
C
/*
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* Point-to-Point Tunneling Protocol for Linux
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*
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* Authors: Dmitry Kozlov <xeb@mail.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/ppp_channel.h>
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#include <linux/ppp_defs.h>
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#include <linux/if_pppox.h>
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#include <linux/ppp-ioctl.h>
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#include <linux/notifier.h>
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#include <linux/file.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/rcupdate.h>
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#include <linux/spinlock.h>
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#include <net/sock.h>
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#include <net/protocol.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/route.h>
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#include <net/gre.h>
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#include <linux/uaccess.h>
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#define PPTP_DRIVER_VERSION "0.8.5"
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#define MAX_CALLID 65535
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static DECLARE_BITMAP(callid_bitmap, MAX_CALLID + 1);
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static struct pppox_sock __rcu **callid_sock;
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static DEFINE_SPINLOCK(chan_lock);
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static struct proto pptp_sk_proto __read_mostly;
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static const struct ppp_channel_ops pptp_chan_ops;
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static const struct proto_ops pptp_ops;
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#define PPP_LCP_ECHOREQ 0x09
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#define PPP_LCP_ECHOREP 0x0A
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#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
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#define MISSING_WINDOW 20
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#define WRAPPED(curseq, lastseq)\
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((((curseq) & 0xffffff00) == 0) &&\
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(((lastseq) & 0xffffff00) == 0xffffff00))
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#define PPTP_GRE_PROTO 0x880B
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#define PPTP_GRE_VER 0x1
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#define PPTP_GRE_FLAG_C 0x80
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#define PPTP_GRE_FLAG_R 0x40
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#define PPTP_GRE_FLAG_K 0x20
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#define PPTP_GRE_FLAG_S 0x10
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#define PPTP_GRE_FLAG_A 0x80
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#define PPTP_GRE_IS_C(f) ((f)&PPTP_GRE_FLAG_C)
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#define PPTP_GRE_IS_R(f) ((f)&PPTP_GRE_FLAG_R)
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#define PPTP_GRE_IS_K(f) ((f)&PPTP_GRE_FLAG_K)
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#define PPTP_GRE_IS_S(f) ((f)&PPTP_GRE_FLAG_S)
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#define PPTP_GRE_IS_A(f) ((f)&PPTP_GRE_FLAG_A)
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#define PPTP_HEADER_OVERHEAD (2+sizeof(struct pptp_gre_header))
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struct pptp_gre_header {
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u8 flags;
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u8 ver;
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__be16 protocol;
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__be16 payload_len;
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__be16 call_id;
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__be32 seq;
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__be32 ack;
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} __packed;
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static struct pppox_sock *lookup_chan(u16 call_id, __be32 s_addr)
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{
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struct pppox_sock *sock;
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struct pptp_opt *opt;
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rcu_read_lock();
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sock = rcu_dereference(callid_sock[call_id]);
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if (sock) {
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opt = &sock->proto.pptp;
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if (opt->dst_addr.sin_addr.s_addr != s_addr)
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sock = NULL;
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else
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sock_hold(sk_pppox(sock));
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}
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rcu_read_unlock();
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return sock;
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}
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static int lookup_chan_dst(u16 call_id, __be32 d_addr)
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{
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struct pppox_sock *sock;
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struct pptp_opt *opt;
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int i;
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rcu_read_lock();
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i = 1;
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for_each_set_bit_from(i, callid_bitmap, MAX_CALLID) {
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sock = rcu_dereference(callid_sock[i]);
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if (!sock)
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continue;
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opt = &sock->proto.pptp;
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if (opt->dst_addr.call_id == call_id &&
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opt->dst_addr.sin_addr.s_addr == d_addr)
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break;
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}
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rcu_read_unlock();
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return i < MAX_CALLID;
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}
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static int add_chan(struct pppox_sock *sock)
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{
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static int call_id;
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spin_lock(&chan_lock);
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if (!sock->proto.pptp.src_addr.call_id) {
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call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, call_id + 1);
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if (call_id == MAX_CALLID) {
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call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, 1);
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if (call_id == MAX_CALLID)
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goto out_err;
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}
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sock->proto.pptp.src_addr.call_id = call_id;
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} else if (test_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap))
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goto out_err;
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set_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap);
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rcu_assign_pointer(callid_sock[sock->proto.pptp.src_addr.call_id], sock);
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spin_unlock(&chan_lock);
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return 0;
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out_err:
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spin_unlock(&chan_lock);
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return -1;
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}
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static void del_chan(struct pppox_sock *sock)
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{
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spin_lock(&chan_lock);
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clear_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap);
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RCU_INIT_POINTER(callid_sock[sock->proto.pptp.src_addr.call_id], NULL);
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spin_unlock(&chan_lock);
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synchronize_rcu();
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}
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static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
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{
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struct sock *sk = (struct sock *) chan->private;
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struct pppox_sock *po = pppox_sk(sk);
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struct pptp_opt *opt = &po->proto.pptp;
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struct pptp_gre_header *hdr;
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unsigned int header_len = sizeof(*hdr);
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struct flowi4 fl4;
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int islcp;
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int len;
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unsigned char *data;
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__u32 seq_recv;
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struct rtable *rt;
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struct net_device *tdev;
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struct iphdr *iph;
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int max_headroom;
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if (sk_pppox(po)->sk_state & PPPOX_DEAD)
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goto tx_error;
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rt = ip_route_output_ports(sock_net(sk), &fl4, NULL,
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opt->dst_addr.sin_addr.s_addr,
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opt->src_addr.sin_addr.s_addr,
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0, 0, IPPROTO_GRE,
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RT_TOS(0), 0);
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if (IS_ERR(rt))
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goto tx_error;
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tdev = rt->dst.dev;
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max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(*iph) + sizeof(*hdr) + 2;
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if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
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struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
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if (!new_skb) {
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ip_rt_put(rt);
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goto tx_error;
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}
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if (skb->sk)
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skb_set_owner_w(new_skb, skb->sk);
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consume_skb(skb);
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skb = new_skb;
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}
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data = skb->data;
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islcp = ((data[0] << 8) + data[1]) == PPP_LCP && 1 <= data[2] && data[2] <= 7;
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/* compress protocol field */
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if ((opt->ppp_flags & SC_COMP_PROT) && data[0] == 0 && !islcp)
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skb_pull(skb, 1);
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/* Put in the address/control bytes if necessary */
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if ((opt->ppp_flags & SC_COMP_AC) == 0 || islcp) {
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data = skb_push(skb, 2);
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data[0] = PPP_ALLSTATIONS;
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data[1] = PPP_UI;
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}
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len = skb->len;
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seq_recv = opt->seq_recv;
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if (opt->ack_sent == seq_recv)
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header_len -= sizeof(hdr->ack);
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/* Push down and install GRE header */
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skb_push(skb, header_len);
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hdr = (struct pptp_gre_header *)(skb->data);
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hdr->flags = PPTP_GRE_FLAG_K;
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hdr->ver = PPTP_GRE_VER;
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hdr->protocol = htons(PPTP_GRE_PROTO);
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hdr->call_id = htons(opt->dst_addr.call_id);
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hdr->flags |= PPTP_GRE_FLAG_S;
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hdr->seq = htonl(++opt->seq_sent);
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if (opt->ack_sent != seq_recv) {
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/* send ack with this message */
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hdr->ver |= PPTP_GRE_FLAG_A;
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hdr->ack = htonl(seq_recv);
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opt->ack_sent = seq_recv;
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}
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hdr->payload_len = htons(len);
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/* Push down and install the IP header. */
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skb_reset_transport_header(skb);
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skb_push(skb, sizeof(*iph));
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skb_reset_network_header(skb);
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memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
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IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | IPSKB_REROUTED);
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iph = ip_hdr(skb);
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iph->version = 4;
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iph->ihl = sizeof(struct iphdr) >> 2;
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if (ip_dont_fragment(sk, &rt->dst))
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iph->frag_off = htons(IP_DF);
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else
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iph->frag_off = 0;
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iph->protocol = IPPROTO_GRE;
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iph->tos = 0;
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iph->daddr = fl4.daddr;
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iph->saddr = fl4.saddr;
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iph->ttl = ip4_dst_hoplimit(&rt->dst);
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iph->tot_len = htons(skb->len);
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skb_dst_drop(skb);
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skb_dst_set(skb, &rt->dst);
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nf_reset(skb);
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skb->ip_summed = CHECKSUM_NONE;
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ip_select_ident(sock_net(sk), skb, NULL);
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ip_send_check(iph);
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ip_local_out(skb);
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return 1;
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tx_error:
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kfree_skb(skb);
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return 1;
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}
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static int pptp_rcv_core(struct sock *sk, struct sk_buff *skb)
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{
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struct pppox_sock *po = pppox_sk(sk);
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struct pptp_opt *opt = &po->proto.pptp;
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int headersize, payload_len, seq;
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__u8 *payload;
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struct pptp_gre_header *header;
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if (!(sk->sk_state & PPPOX_CONNECTED)) {
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if (sock_queue_rcv_skb(sk, skb))
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goto drop;
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return NET_RX_SUCCESS;
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}
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header = (struct pptp_gre_header *)(skb->data);
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headersize = sizeof(*header);
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/* test if acknowledgement present */
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if (PPTP_GRE_IS_A(header->ver)) {
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__u32 ack;
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if (!pskb_may_pull(skb, headersize))
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goto drop;
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header = (struct pptp_gre_header *)(skb->data);
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/* ack in different place if S = 0 */
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ack = PPTP_GRE_IS_S(header->flags) ? header->ack : header->seq;
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ack = ntohl(ack);
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if (ack > opt->ack_recv)
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opt->ack_recv = ack;
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/* also handle sequence number wrap-around */
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if (WRAPPED(ack, opt->ack_recv))
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opt->ack_recv = ack;
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} else {
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headersize -= sizeof(header->ack);
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}
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/* test if payload present */
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if (!PPTP_GRE_IS_S(header->flags))
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goto drop;
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payload_len = ntohs(header->payload_len);
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seq = ntohl(header->seq);
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/* check for incomplete packet (length smaller than expected) */
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if (!pskb_may_pull(skb, headersize + payload_len))
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goto drop;
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payload = skb->data + headersize;
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/* check for expected sequence number */
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if (seq < opt->seq_recv + 1 || WRAPPED(opt->seq_recv, seq)) {
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if ((payload[0] == PPP_ALLSTATIONS) && (payload[1] == PPP_UI) &&
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(PPP_PROTOCOL(payload) == PPP_LCP) &&
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((payload[4] == PPP_LCP_ECHOREQ) || (payload[4] == PPP_LCP_ECHOREP)))
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goto allow_packet;
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} else {
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opt->seq_recv = seq;
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allow_packet:
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skb_pull(skb, headersize);
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if (payload[0] == PPP_ALLSTATIONS && payload[1] == PPP_UI) {
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/* chop off address/control */
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if (skb->len < 3)
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goto drop;
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skb_pull(skb, 2);
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}
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if ((*skb->data) & 1) {
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/* protocol is compressed */
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skb_push(skb, 1)[0] = 0;
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}
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skb->ip_summed = CHECKSUM_NONE;
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skb_set_network_header(skb, skb->head-skb->data);
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ppp_input(&po->chan, skb);
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return NET_RX_SUCCESS;
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}
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drop:
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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static int pptp_rcv(struct sk_buff *skb)
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{
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struct pppox_sock *po;
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struct pptp_gre_header *header;
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struct iphdr *iph;
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if (skb->pkt_type != PACKET_HOST)
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goto drop;
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if (!pskb_may_pull(skb, 12))
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goto drop;
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iph = ip_hdr(skb);
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header = (struct pptp_gre_header *)skb->data;
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if (ntohs(header->protocol) != PPTP_GRE_PROTO || /* PPTP-GRE protocol for PPTP */
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PPTP_GRE_IS_C(header->flags) || /* flag C should be clear */
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PPTP_GRE_IS_R(header->flags) || /* flag R should be clear */
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!PPTP_GRE_IS_K(header->flags) || /* flag K should be set */
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(header->flags&0xF) != 0) /* routing and recursion ctrl = 0 */
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/* if invalid, discard this packet */
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goto drop;
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po = lookup_chan(htons(header->call_id), iph->saddr);
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if (po) {
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skb_dst_drop(skb);
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nf_reset(skb);
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return sk_receive_skb(sk_pppox(po), skb, 0);
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}
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drop:
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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static int pptp_bind(struct socket *sock, struct sockaddr *uservaddr,
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int sockaddr_len)
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{
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struct sock *sk = sock->sk;
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struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
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struct pppox_sock *po = pppox_sk(sk);
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struct pptp_opt *opt = &po->proto.pptp;
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int error = 0;
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lock_sock(sk);
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opt->src_addr = sp->sa_addr.pptp;
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if (add_chan(po))
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error = -EBUSY;
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release_sock(sk);
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return error;
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}
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static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr,
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int sockaddr_len, int flags)
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{
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struct sock *sk = sock->sk;
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struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
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struct pppox_sock *po = pppox_sk(sk);
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struct pptp_opt *opt = &po->proto.pptp;
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struct rtable *rt;
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struct flowi4 fl4;
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int error = 0;
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if (sp->sa_protocol != PX_PROTO_PPTP)
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return -EINVAL;
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if (lookup_chan_dst(sp->sa_addr.pptp.call_id, sp->sa_addr.pptp.sin_addr.s_addr))
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return -EALREADY;
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lock_sock(sk);
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/* Check for already bound sockets */
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if (sk->sk_state & PPPOX_CONNECTED) {
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error = -EBUSY;
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goto end;
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}
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/* Check for already disconnected sockets, on attempts to disconnect */
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if (sk->sk_state & PPPOX_DEAD) {
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error = -EALREADY;
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goto end;
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}
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if (!opt->src_addr.sin_addr.s_addr || !sp->sa_addr.pptp.sin_addr.s_addr) {
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error = -EINVAL;
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goto end;
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}
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po->chan.private = sk;
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po->chan.ops = &pptp_chan_ops;
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rt = ip_route_output_ports(sock_net(sk), &fl4, sk,
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opt->dst_addr.sin_addr.s_addr,
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opt->src_addr.sin_addr.s_addr,
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0, 0,
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IPPROTO_GRE, RT_CONN_FLAGS(sk), 0);
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if (IS_ERR(rt)) {
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error = -EHOSTUNREACH;
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goto end;
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}
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sk_setup_caps(sk, &rt->dst);
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po->chan.mtu = dst_mtu(&rt->dst);
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if (!po->chan.mtu)
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po->chan.mtu = PPP_MRU;
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ip_rt_put(rt);
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po->chan.mtu -= PPTP_HEADER_OVERHEAD;
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po->chan.hdrlen = 2 + sizeof(struct pptp_gre_header);
|
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error = ppp_register_channel(&po->chan);
|
|
if (error) {
|
|
pr_err("PPTP: failed to register PPP channel (%d)\n", error);
|
|
goto end;
|
|
}
|
|
|
|
opt->dst_addr = sp->sa_addr.pptp;
|
|
sk->sk_state = PPPOX_CONNECTED;
|
|
|
|
end:
|
|
release_sock(sk);
|
|
return error;
|
|
}
|
|
|
|
static int pptp_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int *usockaddr_len, int peer)
|
|
{
|
|
int len = sizeof(struct sockaddr_pppox);
|
|
struct sockaddr_pppox sp;
|
|
|
|
memset(&sp.sa_addr, 0, sizeof(sp.sa_addr));
|
|
|
|
sp.sa_family = AF_PPPOX;
|
|
sp.sa_protocol = PX_PROTO_PPTP;
|
|
sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr;
|
|
|
|
memcpy(uaddr, &sp, len);
|
|
|
|
*usockaddr_len = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pptp_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct pppox_sock *po;
|
|
struct pptp_opt *opt;
|
|
int error = 0;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sock_flag(sk, SOCK_DEAD)) {
|
|
release_sock(sk);
|
|
return -EBADF;
|
|
}
|
|
|
|
po = pppox_sk(sk);
|
|
opt = &po->proto.pptp;
|
|
del_chan(po);
|
|
|
|
pppox_unbind_sock(sk);
|
|
sk->sk_state = PPPOX_DEAD;
|
|
|
|
sock_orphan(sk);
|
|
sock->sk = NULL;
|
|
|
|
release_sock(sk);
|
|
sock_put(sk);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void pptp_sock_destruct(struct sock *sk)
|
|
{
|
|
if (!(sk->sk_state & PPPOX_DEAD)) {
|
|
del_chan(pppox_sk(sk));
|
|
pppox_unbind_sock(sk);
|
|
}
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
}
|
|
|
|
static int pptp_create(struct net *net, struct socket *sock, int kern)
|
|
{
|
|
int error = -ENOMEM;
|
|
struct sock *sk;
|
|
struct pppox_sock *po;
|
|
struct pptp_opt *opt;
|
|
|
|
sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pptp_sk_proto, kern);
|
|
if (!sk)
|
|
goto out;
|
|
|
|
sock_init_data(sock, sk);
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
sock->ops = &pptp_ops;
|
|
|
|
sk->sk_backlog_rcv = pptp_rcv_core;
|
|
sk->sk_state = PPPOX_NONE;
|
|
sk->sk_type = SOCK_STREAM;
|
|
sk->sk_family = PF_PPPOX;
|
|
sk->sk_protocol = PX_PROTO_PPTP;
|
|
sk->sk_destruct = pptp_sock_destruct;
|
|
|
|
po = pppox_sk(sk);
|
|
opt = &po->proto.pptp;
|
|
|
|
opt->seq_sent = 0; opt->seq_recv = 0xffffffff;
|
|
opt->ack_recv = 0; opt->ack_sent = 0xffffffff;
|
|
|
|
error = 0;
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static int pptp_ppp_ioctl(struct ppp_channel *chan, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct sock *sk = (struct sock *) chan->private;
|
|
struct pppox_sock *po = pppox_sk(sk);
|
|
struct pptp_opt *opt = &po->proto.pptp;
|
|
void __user *argp = (void __user *)arg;
|
|
int __user *p = argp;
|
|
int err, val;
|
|
|
|
err = -EFAULT;
|
|
switch (cmd) {
|
|
case PPPIOCGFLAGS:
|
|
val = opt->ppp_flags;
|
|
if (put_user(val, p))
|
|
break;
|
|
err = 0;
|
|
break;
|
|
case PPPIOCSFLAGS:
|
|
if (get_user(val, p))
|
|
break;
|
|
opt->ppp_flags = val & ~SC_RCV_BITS;
|
|
err = 0;
|
|
break;
|
|
default:
|
|
err = -ENOTTY;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct ppp_channel_ops pptp_chan_ops = {
|
|
.start_xmit = pptp_xmit,
|
|
.ioctl = pptp_ppp_ioctl,
|
|
};
|
|
|
|
static struct proto pptp_sk_proto __read_mostly = {
|
|
.name = "PPTP",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct pppox_sock),
|
|
};
|
|
|
|
static const struct proto_ops pptp_ops = {
|
|
.family = AF_PPPOX,
|
|
.owner = THIS_MODULE,
|
|
.release = pptp_release,
|
|
.bind = pptp_bind,
|
|
.connect = pptp_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = pptp_getname,
|
|
.poll = sock_no_poll,
|
|
.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,
|
|
.ioctl = pppox_ioctl,
|
|
};
|
|
|
|
static const struct pppox_proto pppox_pptp_proto = {
|
|
.create = pptp_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static const struct gre_protocol gre_pptp_protocol = {
|
|
.handler = pptp_rcv,
|
|
};
|
|
|
|
static int __init pptp_init_module(void)
|
|
{
|
|
int err = 0;
|
|
pr_info("PPTP driver version " PPTP_DRIVER_VERSION "\n");
|
|
|
|
callid_sock = vzalloc((MAX_CALLID + 1) * sizeof(void *));
|
|
if (!callid_sock)
|
|
return -ENOMEM;
|
|
|
|
err = gre_add_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
|
|
if (err) {
|
|
pr_err("PPTP: can't add gre protocol\n");
|
|
goto out_mem_free;
|
|
}
|
|
|
|
err = proto_register(&pptp_sk_proto, 0);
|
|
if (err) {
|
|
pr_err("PPTP: can't register sk_proto\n");
|
|
goto out_gre_del_protocol;
|
|
}
|
|
|
|
err = register_pppox_proto(PX_PROTO_PPTP, &pppox_pptp_proto);
|
|
if (err) {
|
|
pr_err("PPTP: can't register pppox_proto\n");
|
|
goto out_unregister_sk_proto;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unregister_sk_proto:
|
|
proto_unregister(&pptp_sk_proto);
|
|
out_gre_del_protocol:
|
|
gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
|
|
out_mem_free:
|
|
vfree(callid_sock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit pptp_exit_module(void)
|
|
{
|
|
unregister_pppox_proto(PX_PROTO_PPTP);
|
|
proto_unregister(&pptp_sk_proto);
|
|
gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
|
|
vfree(callid_sock);
|
|
}
|
|
|
|
module_init(pptp_init_module);
|
|
module_exit(pptp_exit_module);
|
|
|
|
MODULE_DESCRIPTION("Point-to-Point Tunneling Protocol");
|
|
MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
|
|
MODULE_LICENSE("GPL");
|