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690 lines
16 KiB
690 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Point-to-Point Tunneling Protocol for Linux |
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* |
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* Authors: Dmitry Kozlov <[email protected]> |
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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 <net/pptp.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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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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struct pptp_addr *sa) |
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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 (!sa->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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sa->call_id = call_id; |
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} else if (test_bit(sa->call_id, callid_bitmap)) { |
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goto out_err; |
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} |
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sock->proto.pptp.src_addr = *sa; |
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set_bit(sa->call_id, callid_bitmap); |
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rcu_assign_pointer(callid_sock[sa->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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} |
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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 net *net = sock_net(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(net, &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), sk->sk_bound_dev_if); |
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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->gre_hd.flags = GRE_KEY | GRE_VERSION_1 | GRE_SEQ; |
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hdr->gre_hd.protocol = GRE_PROTO_PPP; |
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hdr->call_id = htons(opt->dst_addr.call_id); |
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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->gre_hd.flags |= GRE_ACK; |
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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_ct(skb); |
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skb->ip_summed = CHECKSUM_NONE; |
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ip_select_ident(net, skb, NULL); |
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ip_send_check(iph); |
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ip_local_out(net, skb->sk, 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 (GRE_IS_ACK(header->gre_hd.flags)) { |
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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 = GRE_IS_SEQ(header->gre_hd.flags) ? ntohl(header->ack) : |
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ntohl(header->seq); |
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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 (!GRE_IS_SEQ(header->gre_hd.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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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 (header->gre_hd.protocol != GRE_PROTO_PPP || /* PPTP-GRE protocol for PPTP */ |
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GRE_IS_CSUM(header->gre_hd.flags) || /* flag CSUM should be clear */ |
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GRE_IS_ROUTING(header->gre_hd.flags) || /* flag ROUTING should be clear */ |
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!GRE_IS_KEY(header->gre_hd.flags) || /* flag KEY should be set */ |
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(header->gre_hd.flags & GRE_FLAGS)) /* flag Recursion Ctrl should be clear */ |
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/* if invalid, discard this packet */ |
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goto drop; |
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po = lookup_chan(ntohs(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_ct(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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int error = 0; |
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if (sockaddr_len < sizeof(struct sockaddr_pppox)) |
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return -EINVAL; |
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lock_sock(sk); |
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if (sk->sk_state & PPPOX_DEAD) { |
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error = -EALREADY; |
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goto out; |
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} |
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if (sk->sk_state & PPPOX_BOUND) { |
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error = -EBUSY; |
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goto out; |
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} |
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if (add_chan(po, &sp->sa_addr.pptp)) |
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error = -EBUSY; |
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else |
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sk->sk_state |= PPPOX_BOUND; |
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out: |
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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 (sockaddr_len < sizeof(struct sockaddr_pppox)) |
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return -EINVAL; |
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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), |
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sk->sk_bound_dev_if); |
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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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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); |
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if (error) { |
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pr_err("PPTP: failed to register PPP channel (%d)\n", error); |
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goto end; |
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} |
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opt->dst_addr = sp->sa_addr.pptp; |
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sk->sk_state |= PPPOX_CONNECTED; |
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end: |
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release_sock(sk); |
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return error; |
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} |
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static int pptp_getname(struct socket *sock, struct sockaddr *uaddr, |
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int peer) |
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{ |
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int len = sizeof(struct sockaddr_pppox); |
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struct sockaddr_pppox sp; |
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memset(&sp.sa_addr, 0, sizeof(sp.sa_addr)); |
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sp.sa_family = AF_PPPOX; |
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sp.sa_protocol = PX_PROTO_PPTP; |
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sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr; |
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memcpy(uaddr, &sp, len); |
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return len; |
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} |
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static int pptp_release(struct socket *sock) |
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{ |
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struct sock *sk = sock->sk; |
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struct pppox_sock *po; |
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int error = 0; |
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if (!sk) |
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return 0; |
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lock_sock(sk); |
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if (sock_flag(sk, SOCK_DEAD)) { |
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release_sock(sk); |
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return -EBADF; |
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} |
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po = pppox_sk(sk); |
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del_chan(po); |
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synchronize_rcu(); |
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pppox_unbind_sock(sk); |
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sk->sk_state = PPPOX_DEAD; |
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sock_orphan(sk); |
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sock->sk = NULL; |
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release_sock(sk); |
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sock_put(sk); |
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return error; |
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} |
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static void pptp_sock_destruct(struct sock *sk) |
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{ |
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if (!(sk->sk_state & PPPOX_DEAD)) { |
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del_chan(pppox_sk(sk)); |
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pppox_unbind_sock(sk); |
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} |
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skb_queue_purge(&sk->sk_receive_queue); |
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dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); |
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} |
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static int pptp_create(struct net *net, struct socket *sock, int kern) |
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{ |
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int error = -ENOMEM; |
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struct sock *sk; |
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struct pppox_sock *po; |
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struct pptp_opt *opt; |
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sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pptp_sk_proto, kern); |
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if (!sk) |
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goto out; |
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sock_init_data(sock, sk); |
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sock->state = SS_UNCONNECTED; |
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sock->ops = &pptp_ops; |
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sk->sk_backlog_rcv = pptp_rcv_core; |
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sk->sk_state = PPPOX_NONE; |
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sk->sk_type = SOCK_STREAM; |
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sk->sk_family = PF_PPPOX; |
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sk->sk_protocol = PX_PROTO_PPTP; |
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sk->sk_destruct = pptp_sock_destruct; |
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po = pppox_sk(sk); |
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opt = &po->proto.pptp; |
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opt->seq_sent = 0; opt->seq_recv = 0xffffffff; |
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opt->ack_recv = 0; opt->ack_sent = 0xffffffff; |
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error = 0; |
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out: |
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return error; |
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} |
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static int pptp_ppp_ioctl(struct ppp_channel *chan, unsigned int cmd, |
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unsigned long arg) |
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{ |
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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, |
|
.listen = sock_no_listen, |
|
.shutdown = sock_no_shutdown, |
|
.sendmsg = sock_no_sendmsg, |
|
.recvmsg = sock_no_recvmsg, |
|
.mmap = sock_no_mmap, |
|
.ioctl = pppox_ioctl, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = pppox_compat_ioctl, |
|
#endif |
|
}; |
|
|
|
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(array_size(sizeof(void *), (MAX_CALLID + 1))); |
|
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 ([email protected])"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_PPTP);
|
|
|