^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Point-to-Point Tunneling Protocol for Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Authors: Dmitry Kozlov <xeb@mail.ru>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/ppp_channel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/ppp_defs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/if_pppox.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/ppp-ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <net/icmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <net/route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <net/gre.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <net/pptp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define PPTP_DRIVER_VERSION "0.8.5"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define MAX_CALLID 65535
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static DECLARE_BITMAP(callid_bitmap, MAX_CALLID + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static struct pppox_sock __rcu **callid_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static DEFINE_SPINLOCK(chan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static struct proto pptp_sk_proto __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static const struct ppp_channel_ops pptp_chan_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static const struct proto_ops pptp_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static struct pppox_sock *lookup_chan(u16 call_id, __be32 s_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct pppox_sock *sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct pptp_opt *opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) sock = rcu_dereference(callid_sock[call_id]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (sock) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) opt = &sock->proto.pptp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (opt->dst_addr.sin_addr.s_addr != s_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) sock = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) sock_hold(sk_pppox(sock));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static int lookup_chan_dst(u16 call_id, __be32 d_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct pppox_sock *sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct pptp_opt *opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) i = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) for_each_set_bit_from(i, callid_bitmap, MAX_CALLID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) sock = rcu_dereference(callid_sock[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (!sock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) opt = &sock->proto.pptp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (opt->dst_addr.call_id == call_id &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) opt->dst_addr.sin_addr.s_addr == d_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return i < MAX_CALLID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static int add_chan(struct pppox_sock *sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct pptp_addr *sa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static int call_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) spin_lock(&chan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (!sa->call_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, call_id + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (call_id == MAX_CALLID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (call_id == MAX_CALLID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) sa->call_id = call_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) } else if (test_bit(sa->call_id, callid_bitmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) sock->proto.pptp.src_addr = *sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) set_bit(sa->call_id, callid_bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) rcu_assign_pointer(callid_sock[sa->call_id], sock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) spin_unlock(&chan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) spin_unlock(&chan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static void del_chan(struct pppox_sock *sock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) spin_lock(&chan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) clear_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) RCU_INIT_POINTER(callid_sock[sock->proto.pptp.src_addr.call_id], NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) spin_unlock(&chan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct sock *sk = (struct sock *) chan->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) struct pppox_sock *po = pppox_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct pptp_opt *opt = &po->proto.pptp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) struct pptp_gre_header *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) unsigned int header_len = sizeof(*hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) struct flowi4 fl4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) int islcp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) unsigned char *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) __u32 seq_recv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct rtable *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct net_device *tdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct iphdr *iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) int max_headroom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (sk_pppox(po)->sk_state & PPPOX_DEAD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) goto tx_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) rt = ip_route_output_ports(net, &fl4, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) opt->dst_addr.sin_addr.s_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) opt->src_addr.sin_addr.s_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 0, 0, IPPROTO_GRE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) RT_TOS(0), sk->sk_bound_dev_if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (IS_ERR(rt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) goto tx_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) tdev = rt->dst.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(*iph) + sizeof(*hdr) + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (!new_skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) ip_rt_put(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) goto tx_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (skb->sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) skb_set_owner_w(new_skb, skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) skb = new_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) data = skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) islcp = ((data[0] << 8) + data[1]) == PPP_LCP && 1 <= data[2] && data[2] <= 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /* compress protocol field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if ((opt->ppp_flags & SC_COMP_PROT) && data[0] == 0 && !islcp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) skb_pull(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) /* Put in the address/control bytes if necessary */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if ((opt->ppp_flags & SC_COMP_AC) == 0 || islcp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) data = skb_push(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) data[0] = PPP_ALLSTATIONS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) data[1] = PPP_UI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) len = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) seq_recv = opt->seq_recv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (opt->ack_sent == seq_recv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) header_len -= sizeof(hdr->ack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) /* Push down and install GRE header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) skb_push(skb, header_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) hdr = (struct pptp_gre_header *)(skb->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) hdr->gre_hd.flags = GRE_KEY | GRE_VERSION_1 | GRE_SEQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) hdr->gre_hd.protocol = GRE_PROTO_PPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) hdr->call_id = htons(opt->dst_addr.call_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) hdr->seq = htonl(++opt->seq_sent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (opt->ack_sent != seq_recv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) /* send ack with this message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) hdr->gre_hd.flags |= GRE_ACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) hdr->ack = htonl(seq_recv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) opt->ack_sent = seq_recv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) hdr->payload_len = htons(len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) /* Push down and install the IP header. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) skb_push(skb, sizeof(*iph));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | IPSKB_REROUTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) iph->version = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) iph->ihl = sizeof(struct iphdr) >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (ip_dont_fragment(sk, &rt->dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) iph->frag_off = htons(IP_DF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) iph->frag_off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) iph->protocol = IPPROTO_GRE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) iph->tos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) iph->daddr = fl4.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) iph->saddr = fl4.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) iph->ttl = ip4_dst_hoplimit(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) iph->tot_len = htons(skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) skb_dst_drop(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) skb_dst_set(skb, &rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) nf_reset_ct(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) skb->ip_summed = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) ip_select_ident(net, skb, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) ip_send_check(iph);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) ip_local_out(net, skb->sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) tx_error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static int pptp_rcv_core(struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct pppox_sock *po = pppox_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) struct pptp_opt *opt = &po->proto.pptp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) int headersize, payload_len, seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) __u8 *payload;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct pptp_gre_header *header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (!(sk->sk_state & PPPOX_CONNECTED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (sock_queue_rcv_skb(sk, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) header = (struct pptp_gre_header *)(skb->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) headersize = sizeof(*header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /* test if acknowledgement present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (GRE_IS_ACK(header->gre_hd.flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) __u32 ack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (!pskb_may_pull(skb, headersize))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) header = (struct pptp_gre_header *)(skb->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /* ack in different place if S = 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) ack = GRE_IS_SEQ(header->gre_hd.flags) ? header->ack : header->seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) ack = ntohl(ack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (ack > opt->ack_recv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) opt->ack_recv = ack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) /* also handle sequence number wrap-around */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) if (WRAPPED(ack, opt->ack_recv))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) opt->ack_recv = ack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) headersize -= sizeof(header->ack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) /* test if payload present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) if (!GRE_IS_SEQ(header->gre_hd.flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) payload_len = ntohs(header->payload_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) seq = ntohl(header->seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) /* check for incomplete packet (length smaller than expected) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (!pskb_may_pull(skb, headersize + payload_len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) payload = skb->data + headersize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /* check for expected sequence number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (seq < opt->seq_recv + 1 || WRAPPED(opt->seq_recv, seq)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) if ((payload[0] == PPP_ALLSTATIONS) && (payload[1] == PPP_UI) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) (PPP_PROTOCOL(payload) == PPP_LCP) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) ((payload[4] == PPP_LCP_ECHOREQ) || (payload[4] == PPP_LCP_ECHOREP)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) goto allow_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) opt->seq_recv = seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) allow_packet:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) skb_pull(skb, headersize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) if (payload[0] == PPP_ALLSTATIONS && payload[1] == PPP_UI) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) /* chop off address/control */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (skb->len < 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) skb_pull(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) skb->ip_summed = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) skb_set_network_header(skb, skb->head-skb->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) ppp_input(&po->chan, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) static int pptp_rcv(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct pppox_sock *po;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) struct pptp_gre_header *header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) struct iphdr *iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (skb->pkt_type != PACKET_HOST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (!pskb_may_pull(skb, 12))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) header = (struct pptp_gre_header *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) if (header->gre_hd.protocol != GRE_PROTO_PPP || /* PPTP-GRE protocol for PPTP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) GRE_IS_CSUM(header->gre_hd.flags) || /* flag CSUM should be clear */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) GRE_IS_ROUTING(header->gre_hd.flags) || /* flag ROUTING should be clear */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) !GRE_IS_KEY(header->gre_hd.flags) || /* flag KEY should be set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) (header->gre_hd.flags & GRE_FLAGS)) /* flag Recursion Ctrl should be clear */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) /* if invalid, discard this packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) po = lookup_chan(htons(header->call_id), iph->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (po) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) skb_dst_drop(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) nf_reset_ct(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) return sk_receive_skb(sk_pppox(po), skb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) static int pptp_bind(struct socket *sock, struct sockaddr *uservaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) int sockaddr_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) struct pppox_sock *po = pppox_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (sockaddr_len < sizeof(struct sockaddr_pppox))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) if (sk->sk_state & PPPOX_DEAD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) error = -EALREADY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) if (sk->sk_state & PPPOX_BOUND) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) error = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (add_chan(po, &sp->sa_addr.pptp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) error = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) sk->sk_state |= PPPOX_BOUND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) int sockaddr_len, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct pppox_sock *po = pppox_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) struct pptp_opt *opt = &po->proto.pptp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct rtable *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) struct flowi4 fl4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) if (sockaddr_len < sizeof(struct sockaddr_pppox))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (sp->sa_protocol != PX_PROTO_PPTP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (lookup_chan_dst(sp->sa_addr.pptp.call_id, sp->sa_addr.pptp.sin_addr.s_addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) return -EALREADY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) /* Check for already bound sockets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (sk->sk_state & PPPOX_CONNECTED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) error = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) /* Check for already disconnected sockets, on attempts to disconnect */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (sk->sk_state & PPPOX_DEAD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) error = -EALREADY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) if (!opt->src_addr.sin_addr.s_addr || !sp->sa_addr.pptp.sin_addr.s_addr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) po->chan.private = sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) po->chan.ops = &pptp_chan_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) rt = ip_route_output_ports(sock_net(sk), &fl4, sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) opt->dst_addr.sin_addr.s_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) opt->src_addr.sin_addr.s_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 0, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) IPPROTO_GRE, RT_CONN_FLAGS(sk),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) sk->sk_bound_dev_if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) if (IS_ERR(rt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) error = -EHOSTUNREACH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) sk_setup_caps(sk, &rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) po->chan.mtu = dst_mtu(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (!po->chan.mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) po->chan.mtu = PPP_MRU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) po->chan.mtu -= PPTP_HEADER_OVERHEAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) po->chan.hdrlen = 2 + sizeof(struct pptp_gre_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) error = ppp_register_channel(&po->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) pr_err("PPTP: failed to register PPP channel (%d)\n", error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) opt->dst_addr = sp->sa_addr.pptp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) sk->sk_state |= PPPOX_CONNECTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) end:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) static int pptp_getname(struct socket *sock, struct sockaddr *uaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) int peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) int len = sizeof(struct sockaddr_pppox);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) struct sockaddr_pppox sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) memset(&sp.sa_addr, 0, sizeof(sp.sa_addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) sp.sa_family = AF_PPPOX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) sp.sa_protocol = PX_PROTO_PPTP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) memcpy(uaddr, &sp, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) static int pptp_release(struct socket *sock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) struct pppox_sock *po;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) if (!sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) if (sock_flag(sk, SOCK_DEAD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) return -EBADF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) po = pppox_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) del_chan(po);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) synchronize_rcu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) pppox_unbind_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) sk->sk_state = PPPOX_DEAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) sock_orphan(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) sock->sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) static void pptp_sock_destruct(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (!(sk->sk_state & PPPOX_DEAD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) del_chan(pppox_sk(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) pppox_unbind_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) skb_queue_purge(&sk->sk_receive_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) static int pptp_create(struct net *net, struct socket *sock, int kern)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) int error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) struct pppox_sock *po;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) struct pptp_opt *opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pptp_sk_proto, kern);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) if (!sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) sock_init_data(sock, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) sock->state = SS_UNCONNECTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) sock->ops = &pptp_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) sk->sk_backlog_rcv = pptp_rcv_core;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) sk->sk_state = PPPOX_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) sk->sk_type = SOCK_STREAM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) sk->sk_family = PF_PPPOX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) sk->sk_protocol = PX_PROTO_PPTP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) sk->sk_destruct = pptp_sock_destruct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) po = pppox_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) opt = &po->proto.pptp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) opt->seq_sent = 0; opt->seq_recv = 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) opt->ack_recv = 0; opt->ack_sent = 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) static int pptp_ppp_ioctl(struct ppp_channel *chan, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) struct sock *sk = (struct sock *) chan->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) struct pppox_sock *po = pppox_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) struct pptp_opt *opt = &po->proto.pptp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) int __user *p = argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) int err, val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) case PPPIOCGFLAGS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) val = opt->ppp_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) if (put_user(val, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) case PPPIOCSFLAGS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) if (get_user(val, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) opt->ppp_flags = val & ~SC_RCV_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) err = -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) static const struct ppp_channel_ops pptp_chan_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) .start_xmit = pptp_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) .ioctl = pptp_ppp_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) static struct proto pptp_sk_proto __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) .name = "PPTP",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) .obj_size = sizeof(struct pppox_sock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) static const struct proto_ops pptp_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) .family = AF_PPPOX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) .release = pptp_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) .bind = pptp_bind,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) .connect = pptp_connect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) .socketpair = sock_no_socketpair,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) .accept = sock_no_accept,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) .getname = pptp_getname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) .listen = sock_no_listen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) .shutdown = sock_no_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) .sendmsg = sock_no_sendmsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) .recvmsg = sock_no_recvmsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) .mmap = sock_no_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) .ioctl = pppox_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) .compat_ioctl = pppox_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) static const struct pppox_proto pppox_pptp_proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) .create = pptp_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) static const struct gre_protocol gre_pptp_protocol = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) .handler = pptp_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) static int __init pptp_init_module(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) pr_info("PPTP driver version " PPTP_DRIVER_VERSION "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) callid_sock = vzalloc(array_size(sizeof(void *), (MAX_CALLID + 1)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) if (!callid_sock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) err = gre_add_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) pr_err("PPTP: can't add gre protocol\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) goto out_mem_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) err = proto_register(&pptp_sk_proto, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) pr_err("PPTP: can't register sk_proto\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) goto out_gre_del_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) err = register_pppox_proto(PX_PROTO_PPTP, &pppox_pptp_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) pr_err("PPTP: can't register pppox_proto\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) goto out_unregister_sk_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) out_unregister_sk_proto:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) proto_unregister(&pptp_sk_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) out_gre_del_protocol:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) out_mem_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) vfree(callid_sock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) static void __exit pptp_exit_module(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) unregister_pppox_proto(PX_PROTO_PPTP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) proto_unregister(&pptp_sk_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) vfree(callid_sock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) module_init(pptp_init_module);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) module_exit(pptp_exit_module);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) MODULE_DESCRIPTION("Point-to-Point Tunneling Protocol");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_PPTP);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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