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Message-Id: <E1OgbTZ-0006nb-00.xeb-mail-ru@f279.mail.ru>
Date: Wed, 04 Aug 2010 14:45:33 +0400
From: xeb@...l.ru
To: netdev@...r.kernel.org
Subject: [PATCH 2/3] PPTP: PPP over IPv4 (Point-to-Point Tunneling Protocol)
This is patch 2/3 which contains pptp driver source.
---
drivers/net/Kconfig | 11 +
drivers/net/Makefile | 1 +
drivers/net/pptp.c | 821 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/if_pppox.h | 20 +-
4 files changed, 852 insertions(+), 1 deletions(-)
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index ce2fcdd..2fa0516 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -3167,6 +3167,17 @@ config PPPOE
which contains instruction on how to use this driver (under
the heading "Kernel mode PPPoE").
+config PPTP
+ tristate "PPP over IPv4 (PPTP) (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && PPP && NET_IPGRE_DEMUX
+ help
+ Support for PPP over IPv4.(Point-to-Point Tunneling Protocol)
+
+ This driver requires pppd plugin to work in client mode or
+ modified pptpd (poptop) to work in server mode.
+ See http://accel-pptp.sourceforge.net/ for information how to
+ utilize this module.
+
config PPPOATM
tristate "PPP over ATM"
depends on ATM && PPP
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 0a0512a..b33fef1 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -162,6 +162,7 @@ obj-$(CONFIG_PPP_BSDCOMP) += bsd_comp.o
obj-$(CONFIG_PPP_MPPE) += ppp_mppe.o
obj-$(CONFIG_PPPOE) += pppox.o pppoe.o
obj-$(CONFIG_PPPOL2TP) += pppox.o
+obj-$(CONFIG_PPTP) += pppox.o pptp.o
obj-$(CONFIG_SLIP) += slip.o
obj-$(CONFIG_SLHC) += slhc.o
diff --git a/drivers/net/pptp.c b/drivers/net/pptp.c
new file mode 100644
index 0000000..0c2dbe9
--- /dev/null
+++ b/drivers/net/pptp.c
@@ -0,0 +1,821 @@
+/*
+ * Point-to-Point Tunneling Protocol for Linux
+ *
+ * Authors: Dmitry Kozlov <xeb@...l.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/ppp_channel.h>
+#include <linux/ppp_defs.h>
+#include <linux/if_pppox.h>
+#include <linux/if_ppp.h>
+#include <linux/notifier.h>
+#include <linux/file.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/version.h>
+#include <linux/spinlock.h>
+
+#include <net/sock.h>
+#include <net/protocol.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/route.h>
+#include <net/gre.h>
+
+#include <asm/uaccess.h>
+
+#define DEBUG
+
+#define PPTP_DRIVER_VERSION "0.8.4"
+
+static int log_level = 0;
+static int log_packets = 10;
+
+#define MAX_CALLID 65535
+#define PPP_LCP_ECHOREQ 0x09
+#define PPP_LCP_ECHOREP 0x0A
+#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
+
+static unsigned long *callid_bitmap = NULL;
+static struct pppox_sock **callid_sock=NULL;
+
+
+static DEFINE_RWLOCK(chan_lock);
+
+static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
+static int pptp_ppp_ioctl(struct ppp_channel *chan, unsigned int cmd,
+ unsigned long arg);
+static int pptp_rcv_core(struct sock *sk,struct sk_buff *skb);
+
+static struct ppp_channel_ops pptp_chan_ops = {
+ .start_xmit = pptp_xmit,
+ .ioctl = pptp_ppp_ioctl,
+};
+
+
+#define MISSING_WINDOW 20
+#define WRAPPED( curseq, lastseq) \
+ ((((curseq) & 0xffffff00) == 0) && \
+ (((lastseq) & 0xffffff00 ) == 0xffffff00))
+
+/* gre header structure: -------------------------------------------- */
+
+#define PPTP_GRE_PROTO 0x880B
+#define PPTP_GRE_VER 0x1
+
+#define PPTP_GRE_FLAG_C 0x80
+#define PPTP_GRE_FLAG_R 0x40
+#define PPTP_GRE_FLAG_K 0x20
+#define PPTP_GRE_FLAG_S 0x10
+#define PPTP_GRE_FLAG_A 0x80
+
+#define PPTP_GRE_IS_C(f) ((f)&PPTP_GRE_FLAG_C)
+#define PPTP_GRE_IS_R(f) ((f)&PPTP_GRE_FLAG_R)
+#define PPTP_GRE_IS_K(f) ((f)&PPTP_GRE_FLAG_K)
+#define PPTP_GRE_IS_S(f) ((f)&PPTP_GRE_FLAG_S)
+#define PPTP_GRE_IS_A(f) ((f)&PPTP_GRE_FLAG_A)
+
+#define PPTP_HEADER_OVERHEAD (2+sizeof(struct pptp_gre_header))
+struct pptp_gre_header {
+ u_int8_t flags; /* bitfield */
+ u_int8_t ver; /* should be PPTP_GRE_VER (enhanced GRE) */
+ u_int16_t protocol; /* should be PPTP_GRE_PROTO (ppp-encaps) */
+ u_int16_t payload_len; /* size of ppp payload, not inc. gre header */
+ u_int16_t call_id; /* peer's call_id for this session */
+ u_int32_t seq; /* sequence number. Present if S==1 */
+ u_int32_t ack; /* seq number of highest packet recieved by */
+ /* sender in this session */
+};
+
+static struct pppox_sock * lookup_chan(__u16 call_id, __be32 s_addr)
+{
+ struct pppox_sock *sock;
+ struct pptp_opt *opt;
+
+ read_lock(&chan_lock);
+ sock = callid_sock[call_id];
+ if (sock) {
+ opt = &sock->proto.pptp;
+ if (opt->dst_addr.sin_addr.s_addr != s_addr) sock = NULL;
+ else sock_hold(sk_pppox(sock));
+ }
+ read_unlock(&chan_lock);
+
+ return sock;
+}
+
+static int lookup_chan_dst(__u16 call_id, __be32 d_addr)
+{
+ struct pppox_sock *sock;
+ struct pptp_opt *opt;
+ int i;
+
+ read_lock(&chan_lock);
+ for(i = find_next_bit(callid_bitmap,MAX_CALLID,1); i < MAX_CALLID; i = find_next_bit(callid_bitmap,MAX_CALLID,i+1)) {
+ sock = callid_sock[i];
+ opt = &sock->proto.pptp;
+ if (opt->dst_addr.call_id == call_id && opt->dst_addr.sin_addr.s_addr == d_addr) break;
+ }
+ read_unlock(&chan_lock);
+
+ return i < MAX_CALLID;
+}
+
+static int add_chan(struct pppox_sock *sock)
+{
+ static int call_id = 0;
+ int res = -1;
+
+ write_lock_bh(&chan_lock);
+
+ if (!sock->proto.pptp.src_addr.call_id) {
+ call_id = find_next_zero_bit(callid_bitmap,MAX_CALLID,call_id+1);
+ if (call_id == MAX_CALLID)
+ call_id = find_next_zero_bit(callid_bitmap,MAX_CALLID,1);
+ sock->proto.pptp.src_addr.call_id = call_id;
+ }
+ else if (test_bit(sock->proto.pptp.src_addr.call_id,callid_bitmap))
+ goto exit;
+
+ set_bit(sock->proto.pptp.src_addr.call_id,callid_bitmap);
+ callid_sock[sock->proto.pptp.src_addr.call_id] = sock;
+ res = 0;
+
+exit:
+ write_unlock_bh(&chan_lock);
+
+ return res;
+}
+
+static void del_chan(struct pppox_sock *sock)
+{
+ write_lock_bh(&chan_lock);
+ clear_bit(sock->proto.pptp.src_addr.call_id,callid_bitmap);
+ callid_sock[sock->proto.pptp.src_addr.call_id] = NULL;
+ write_unlock_bh(&chan_lock);
+}
+
+static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
+{
+ struct sock *sk = (struct sock *) chan->private;
+ struct pppox_sock *po = pppox_sk(sk);
+ struct pptp_opt *opt = &po->proto.pptp;
+ struct pptp_gre_header *hdr;
+ unsigned int header_len = sizeof(*hdr);
+ int err = 0;
+ int islcp;
+ int len;
+ unsigned char *data;
+ __u32 seq_recv;
+
+
+ struct rtable *rt; /* Route to the other host */
+ struct net_device *tdev; /* Device to other host */
+ struct iphdr *iph; /* Our new IP header */
+ int max_headroom; /* The extra header space needed */
+
+ if (sk_pppox(po)->sk_state & PPPOX_DEAD)
+ goto tx_error;
+
+ {
+ struct flowi fl = { .oif = 0,
+ .nl_u = { .ip4_u =
+ { .daddr = opt->dst_addr.sin_addr.s_addr,
+ .saddr = opt->src_addr.sin_addr.s_addr,
+ .tos = RT_TOS(0) } },
+ .proto = IPPROTO_GRE };
+ if ((err=ip_route_output_key(&init_net,&rt, &fl))) {
+ goto tx_error;
+ }
+ }
+ tdev = rt->u.dst.dev;
+
+ max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(*iph)+sizeof(*hdr)+2;
+
+ if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
+ struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
+ if (!new_skb) {
+ ip_rt_put(rt);
+ goto tx_error;
+ }
+ if (skb->sk)
+ skb_set_owner_w(new_skb, skb->sk);
+ kfree_skb(skb);
+ skb = new_skb;
+ }
+
+ data = skb->data;
+ islcp = ((data[0] << 8) + data[1])== PPP_LCP && 1 <= data[2] && data[2] <= 7;
+
+ /* compress protocol field */
+ if ((opt->ppp_flags & SC_COMP_PROT) && data[0] == 0 && !islcp)
+ skb_pull(skb,1);
+
+ /*
+ * Put in the address/control bytes if necessary
+ */
+ if ((opt->ppp_flags & SC_COMP_AC) == 0 || islcp) {
+ data = skb_push(skb,2);
+ data[0] = PPP_ALLSTATIONS;
+ data[1] = PPP_UI;
+ }
+
+ len = skb->len;
+
+ seq_recv = opt->seq_recv;
+
+ if (opt->ack_sent == seq_recv) header_len -= sizeof(hdr->ack);
+
+ // Push down and install GRE header
+ skb_push(skb,header_len);
+ hdr = (struct pptp_gre_header *)(skb->data);
+
+ hdr->flags = PPTP_GRE_FLAG_K;
+ hdr->ver = PPTP_GRE_VER;
+ hdr->protocol = htons(PPTP_GRE_PROTO);
+ hdr->call_id = htons(opt->dst_addr.call_id);
+
+ hdr->flags |= PPTP_GRE_FLAG_S;
+ hdr->seq = htonl(++opt->seq_sent);
+ #ifdef DEBUG
+ if (log_level >= 3 && opt->seq_sent <= log_packets)
+ printk(KERN_INFO"PPTP[%i]: send packet: seq=%i",opt->src_addr.call_id,opt->seq_sent);
+ #endif
+ if (opt->ack_sent != seq_recv) {
+ /* send ack with this message */
+ hdr->ver |= PPTP_GRE_FLAG_A;
+ hdr->ack = htonl(seq_recv);
+ opt->ack_sent = seq_recv;
+ #ifdef DEBUG
+ if (log_level >= 3 && opt->seq_sent <= log_packets)
+ printk(" ack=%i",seq_recv);
+ #endif
+ }
+ hdr->payload_len = htons(len);
+ #ifdef DEBUG
+ if (log_level >= 3 && opt->seq_sent <= log_packets)
+ printk("\n");
+ #endif
+
+ /*
+ * Push down and install the IP header.
+ */
+
+ skb_reset_transport_header(skb);
+ skb_push(skb, sizeof(*iph));
+ skb_reset_network_header(skb);
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | IPSKB_REROUTED);
+
+ iph = ip_hdr(skb);
+ iph->version = 4;
+ iph->ihl = sizeof(struct iphdr) >> 2;
+ if (ip_dont_fragment(sk, &rt->u.dst))
+ iph->frag_off = htons(IP_DF);
+ else
+ iph->frag_off = 0;
+ iph->protocol = IPPROTO_GRE;
+ iph->tos = 0;
+ iph->daddr = rt->rt_dst;
+ iph->saddr = rt->rt_src;
+ iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT);
+ iph->tot_len = htons(skb->len);
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb,&rt->u.dst);
+
+ nf_reset(skb);
+
+ skb->ip_summed = CHECKSUM_NONE;
+ ip_select_ident(iph, &rt->u.dst, NULL);
+ ip_send_check(iph);
+
+ ip_local_out(skb);
+
+tx_error:
+ return 1;
+}
+
+static int pptp_rcv_core(struct sock *sk,struct sk_buff *skb)
+{
+ struct pppox_sock *po = pppox_sk(sk);
+ struct pptp_opt *opt = &po->proto.pptp;
+ int headersize,payload_len,seq;
+ __u8 *payload;
+ struct pptp_gre_header *header;
+
+ if (!(sk->sk_state & PPPOX_CONNECTED)) {
+ if (sock_queue_rcv_skb(sk, skb))
+ goto drop;
+ return NET_RX_SUCCESS;
+ }
+
+ header = (struct pptp_gre_header *)(skb->data);
+
+ /* test if acknowledgement present */
+ if (PPTP_GRE_IS_A(header->ver)){
+ __u32 ack = (PPTP_GRE_IS_S(header->flags))?
+ header->ack:header->seq; /* ack in different place if S = 0 */
+
+ ack = ntohl( ack);
+
+ if (ack > opt->ack_recv) opt->ack_recv = ack;
+ /* also handle sequence number wrap-around */
+ if (WRAPPED(ack,opt->ack_recv)) opt->ack_recv = ack;
+ }
+
+ /* test if payload present */
+ if (!PPTP_GRE_IS_S(header->flags)){
+ goto drop;
+ }
+
+ headersize = sizeof(*header);
+ payload_len = ntohs(header->payload_len);
+ seq = ntohl(header->seq);
+
+ /* no ack present? */
+ if (!PPTP_GRE_IS_A(header->ver)) headersize -= sizeof(header->ack);
+ /* check for incomplete packet (length smaller than expected) */
+ if (skb->len - headersize < payload_len) {
+ #ifdef DEBUG
+ if (log_level >= 1)
+ printk(KERN_INFO"PPTP: discarding truncated packet (expected %d, got %d bytes)\n",
+ payload_len, skb->len - headersize);
+ #endif
+ goto drop;
+ }
+
+ payload = skb->data+headersize;
+ /* check for expected sequence number */
+ if ( seq < opt->seq_recv + 1 || WRAPPED(opt->seq_recv, seq) ) {
+ if ( (payload[0] == PPP_ALLSTATIONS) && (payload[1] == PPP_UI) &&
+ (PPP_PROTOCOL(payload) == PPP_LCP) &&
+ ((payload[4] == PPP_LCP_ECHOREQ) || (payload[4] == PPP_LCP_ECHOREP)) ) {
+ #ifdef DEBUG
+ if ( log_level >= 1)
+ printk(KERN_INFO"PPTP[%i]: allowing old LCP Echo packet %d (expecting %d)\n", opt->src_addr.call_id,
+ seq, opt->seq_recv + 1);
+ #endif
+ goto allow_packet;
+ }
+ #ifdef DEBUG
+ if ( log_level >= 1)
+ printk(KERN_INFO"PPTP[%i]: discarding duplicate or old packet %d (expecting %d)\n",opt->src_addr.call_id,
+ seq, opt->seq_recv + 1);
+ #endif
+ }else{
+ opt->seq_recv = seq;
+allow_packet:
+ #ifdef DEBUG
+ if ( log_level >= 3 && opt->seq_sent<=log_packets)
+ printk(KERN_INFO"PPTP[%i]: accepting packet %d size=%i (%02x %02x %02x %02x %02x %02x)\n",opt->src_addr.call_id, seq,payload_len,
+ *(payload +0),
+ *(payload +1),
+ *(payload +2),
+ *(payload +3),
+ *(payload +4),
+ *(payload +5));
+ #endif
+
+ skb_pull(skb,headersize);
+
+ if (payload[0] == PPP_ALLSTATIONS && payload[1] == PPP_UI) {
+ /* chop off address/control */
+ if (skb->len < 3)
+ goto drop;
+ skb_pull(skb,2);
+ }
+
+ if ((*skb->data) & 1){
+ /* protocol is compressed */
+ skb_push(skb, 1)[0] = 0;
+ }
+
+ skb->ip_summed = CHECKSUM_NONE;
+ skb_set_network_header(skb,skb->head-skb->data);
+ ppp_input(&po->chan,skb);
+
+ return NET_RX_SUCCESS;
+ }
+drop:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+static int pptp_rcv(struct sk_buff *skb)
+{
+ struct pppox_sock *po;
+ struct pptp_gre_header *header;
+ struct iphdr *iph;
+
+ if (skb->pkt_type != PACKET_HOST)
+ goto drop;
+
+ if (!pskb_may_pull(skb, 12))
+ goto drop;
+
+ iph = ip_hdr(skb);
+
+ header = (struct pptp_gre_header *)skb->data;
+
+ if ( /* version should be 1 */
+ ((header->ver & 0x7F) != PPTP_GRE_VER) ||
+ /* PPTP-GRE protocol for PPTP */
+ (ntohs(header->protocol) != PPTP_GRE_PROTO)||
+ /* flag C should be clear */
+ PPTP_GRE_IS_C(header->flags) ||
+ /* flag R should be clear */
+ PPTP_GRE_IS_R(header->flags) ||
+ /* flag K should be set */
+ (!PPTP_GRE_IS_K(header->flags)) ||
+ /* routing and recursion ctrl = 0 */
+ ((header->flags&0xF) != 0)){
+ /* if invalid, discard this packet */
+ if (log_level >=1 )
+ printk(KERN_INFO"PPTP: Discarding GRE: %X %X %X %X %X %X\n",
+ header->ver&0x7F, ntohs(header->protocol),
+ PPTP_GRE_IS_C(header->flags),
+ PPTP_GRE_IS_R(header->flags),
+ PPTP_GRE_IS_K(header->flags),
+ header->flags & 0xF);
+ goto drop;
+ }
+
+
+ if ((po=lookup_chan(htons(header->call_id),iph->saddr))) {
+ skb_dst_drop(skb);
+ skb_dst_set(skb,NULL);
+ nf_reset(skb);
+ return sk_receive_skb(sk_pppox(po), skb, 0);
+ } else {
+ if (log_level >= 1)
+ printk(KERN_INFO"PPTP: Discarding packet from unknown call_id %i\n",htons(header->call_id));
+ }
+
+drop:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+static int pptp_bind(struct socket *sock,struct sockaddr *uservaddr,int sockaddr_len)
+{
+ struct sock *sk = sock->sk;
+ struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
+ struct pppox_sock *po = pppox_sk(sk);
+ struct pptp_opt *opt = &po->proto.pptp;
+ int error = 0;
+
+ #ifdef DEBUG
+ if (log_level >= 1)
+ printk(KERN_INFO"PPTP: bind: addr=%X call_id=%i\n",sp->sa_addr.pptp.sin_addr.s_addr,
+ sp->sa_addr.pptp.call_id);
+ #endif
+ lock_sock(sk);
+
+ opt->src_addr = sp->sa_addr.pptp;
+ if (add_chan(po)) {
+ release_sock(sk);
+ error = -EBUSY;
+ }
+ #ifdef DEBUG
+ if (log_level >= 1)
+ printk(KERN_INFO"PPTP: using call_id %i\n",opt->src_addr.call_id);
+ #endif
+
+ release_sock(sk);
+ return error;
+}
+
+static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr,
+ int sockaddr_len, int flags)
+{
+ struct sock *sk = sock->sk;
+ struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
+ struct pppox_sock *po = pppox_sk(sk);
+ struct pptp_opt *opt = &po->proto.pptp;
+ struct rtable *rt; /* Route to the other host */
+ int error=0;
+
+ if (sp->sa_protocol != PX_PROTO_PPTP)
+ return -EINVAL;
+
+ #ifdef DEBUG
+ if (log_level >= 1)
+ printk(KERN_INFO"PPTP[%i]: connect: addr=%X call_id=%i\n",opt->src_addr.call_id,
+ sp->sa_addr.pptp.sin_addr.s_addr,sp->sa_addr.pptp.call_id);
+ #endif
+
+ if (lookup_chan_dst(sp->sa_addr.pptp.call_id,sp->sa_addr.pptp.sin_addr.s_addr))
+ return -EALREADY;
+
+ lock_sock(sk);
+ /* Check for already bound sockets */
+ if (sk->sk_state & PPPOX_CONNECTED){
+ error = -EBUSY;
+ goto end;
+ }
+
+ /* Check for already disconnected sockets, on attempts to disconnect */
+ if (sk->sk_state & PPPOX_DEAD){
+ error = -EALREADY;
+ goto end;
+ }
+
+ if (!opt->src_addr.sin_addr.s_addr || !sp->sa_addr.pptp.sin_addr.s_addr){
+ error = -EINVAL;
+ goto end;
+ }
+
+ po->chan.private = sk;
+ po->chan.ops = &pptp_chan_ops;
+
+ {
+ struct flowi fl = {
+ .nl_u = { .ip4_u =
+ { .daddr = opt->dst_addr.sin_addr.s_addr,
+ .saddr = opt->src_addr.sin_addr.s_addr,
+ .tos = RT_CONN_FLAGS(sk) } },
+ .proto = IPPROTO_GRE };
+ security_sk_classify_flow(sk, &fl);
+ if (ip_route_output_key(&init_net, &rt, &fl)) {
+ error = -EHOSTUNREACH;
+ goto end;
+ }
+ sk_setup_caps(sk, &rt->u.dst);
+ }
+ po->chan.mtu = dst_mtu(&rt->u.dst);
+ if (!po->chan.mtu) po->chan.mtu = PPP_MTU;
+ ip_rt_put(rt);
+ po->chan.mtu -= PPTP_HEADER_OVERHEAD;
+
+ po->chan.hdrlen = 2 + sizeof(struct pptp_gre_header);
+ error = ppp_register_channel(&po->chan);
+ if (error) {
+ printk(KERN_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;
+
+ 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;
+
+ #ifdef DEBUG
+ if (log_level >= 1)
+ printk(KERN_INFO"PPTP[%i]: release\n",opt->src_addr.call_id);
+ #endif
+
+ sock_orphan(sk);
+ sock->sk = NULL;
+
+ release_sock(sk);
+ sock_put(sk);
+
+ return error;
+}
+
+
+static struct proto pptp_sk_proto = {
+ .name = "PPTP",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct pppox_sock),
+};
+
+static 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 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 error = -ENOMEM;
+ struct sock *sk;
+ struct pppox_sock *po;
+ struct pptp_opt *opt;
+
+ sk = sk_alloc(net,PF_PPPOX, GFP_KERNEL, &pptp_sk_proto);
+ 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 = 0;
+ opt->ack_recv = 0; opt->ack_sent = 0;
+
+ 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 struct pppox_proto pppox_pptp_proto = {
+ .create = pptp_create,
+ .owner = THIS_MODULE,
+};
+
+
+static struct gre_protocol gre_pptp_protocol = {
+ .handler = pptp_rcv,
+ //.err_handler = pptp_err,
+};
+
+static int __init pptp_init_module(void)
+{
+ int err=0;
+ printk(KERN_INFO "PPTP driver version " PPTP_DRIVER_VERSION "\n");
+
+ if (gre_add_protocol(&gre_pptp_protocol, GREPROTO_PPTP) < 0) {
+ printk(KERN_INFO "PPTP: can't add protocol\n");
+ goto out;
+ }
+
+ err = proto_register(&pptp_sk_proto, 0);
+ if (err) {
+ printk(KERN_INFO "PPTP: can't register sk_proto\n");
+ goto out_inet_del_protocol;
+ }
+
+ err = register_pppox_proto(PX_PROTO_PPTP, &pppox_pptp_proto);
+ if (err) {
+ printk(KERN_INFO "PPTP: can't register pppox_proto\n");
+ goto out_unregister_sk_proto;
+ }
+
+
+ //assuming PAGESIZE is 4096 bytes
+ callid_bitmap = (unsigned long*)__get_free_pages(GFP_KERNEL,1);
+ memset(callid_bitmap,0,PAGE_SIZE << 1);
+
+ #if (BITS_PER_LONG == 32)
+ callid_sock = (struct pppox_sock **)__get_free_pages(GFP_KERNEL,6);
+ memset(callid_sock,0,PAGE_SIZE << 6);
+ #elif (BITS_PER_LONG == 64)
+ callid_sock = (struct pppox_sock **)__get_free_pages(GFP_KERNEL,7);
+ memset(callid_sock,0,PAGE_SIZE << 7);
+ #else
+ #error unknown size of LONG
+ #endif
+
+out:
+ return err;
+out_unregister_sk_proto:
+ proto_unregister(&pptp_sk_proto);
+out_inet_del_protocol:
+ gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
+ 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);
+ if (callid_bitmap) free_pages((unsigned long)callid_bitmap,1);
+ if (callid_sock) {
+ #if (BITS_PER_LONG == 32)
+ free_pages((unsigned long)callid_sock,6);
+ #elif (BITS_PER_LONG == 64)
+ free_pages((unsigned long)callid_sock,7);
+ #endif
+ }
+}
+
+module_init(pptp_init_module);
+module_exit(pptp_exit_module);
+
+MODULE_DESCRIPTION("Point-to-Point Tunneling Protocol for Linux");
+MODULE_AUTHOR("D. Kozlov (xeb@...l.ru)");
+MODULE_LICENSE("GPL");
+
+module_param(log_level,int,0);
+module_param(log_packets,int,0);
+MODULE_PARM_DESC(log_level,"Logging level (default=0)");
+
diff --git a/include/linux/if_pppox.h b/include/linux/if_pppox.h
index a6577af..455ff56 100644
--- a/include/linux/if_pppox.h
+++ b/include/linux/if_pppox.h
@@ -47,17 +47,27 @@ struct pppoe_addr{
};
/************************************************************************
+ * PPTP addressing definition
+ */
+struct pptp_addr{
+ __u16 call_id;
+ struct in_addr sin_addr;
+};
+
+/************************************************************************
* Protocols supported by AF_PPPOX
*/
#define PX_PROTO_OE 0 /* Currently just PPPoE */
#define PX_PROTO_OL2TP 1 /* Now L2TP also */
-#define PX_MAX_PROTO 2
+#define PX_PROTO_PPTP 2
+#define PX_MAX_PROTO 3
struct sockaddr_pppox {
sa_family_t sa_family; /* address family, AF_PPPOX */
unsigned int sa_protocol; /* protocol identifier */
union{
struct pppoe_addr pppoe;
+ struct pptp_addr pptp;
}sa_addr;
}__attribute__ ((packed));
@@ -150,6 +160,13 @@ struct pppoe_opt {
relayed to (PPPoE relaying) */
};
+struct pptp_opt {
+ struct pptp_addr src_addr;
+ struct pptp_addr dst_addr;
+ __u32 ack_sent, ack_recv;
+ __u32 seq_sent, seq_recv;
+ int ppp_flags;
+};
#include <net/sock.h>
struct pppox_sock {
@@ -159,6 +176,7 @@ struct pppox_sock {
struct pppox_sock *next; /* for hash table */
union {
struct pppoe_opt pppoe;
+ struct pptp_opt pptp;
} proto;
__be16 num;
};
--
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