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linux_dsm_epyc7002/drivers/net/ppp/pptp.c
Kees Cook fad953ce0b treewide: Use array_size() in vzalloc() 
The vzalloc() function has no 2-factor argument form, so multiplication
factors need to be wrapped in array_size(). This patch replaces cases of:

        vzalloc(a * b)

with:
        vzalloc(array_size(a, b))

as well as handling cases of:

        vzalloc(a * b * c)

with:

        vzalloc(array3_size(a, b, c))

This does, however, attempt to ignore constant size factors like:

        vzalloc(4 * 1024)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  vzalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  vzalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  vzalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
  vzalloc(
-	sizeof(TYPE) * (COUNT_ID)
+	array_size(COUNT_ID, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * COUNT_ID
+	array_size(COUNT_ID, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * (COUNT_CONST)
+	array_size(COUNT_CONST, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * COUNT_CONST
+	array_size(COUNT_CONST, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(THING) * (COUNT_ID)
+	array_size(COUNT_ID, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * COUNT_ID
+	array_size(COUNT_ID, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * (COUNT_CONST)
+	array_size(COUNT_CONST, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * COUNT_CONST
+	array_size(COUNT_CONST, sizeof(THING))
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

  vzalloc(
-	SIZE * COUNT
+	array_size(COUNT, SIZE)
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  vzalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  vzalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  vzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  vzalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  vzalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  vzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  vzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  vzalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  vzalloc(C1 * C2 * C3, ...)
|
  vzalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants.
@@
expression E1, E2;
constant C1, C2;
@@

(
  vzalloc(C1 * C2, ...)
|
  vzalloc(
-	E1 * E2
+	array_size(E1, E2)
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

700 lines
16 KiB
C
Raw Blame History

/*
* Point-to-Point Tunneling Protocol for Linux
*
* Authors: Dmitry Kozlov <xeb@mail.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/vmalloc.h>
#include <linux/init.h>
#include <linux/ppp_channel.h>
#include <linux/ppp_defs.h>
#include <linux/if_pppox.h>
#include <linux/ppp-ioctl.h>
#include <linux/notifier.h>
#include <linux/file.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/rcupdate.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 <net/pptp.h>
#include <linux/uaccess.h>
#define PPTP_DRIVER_VERSION "0.8.5"
#define MAX_CALLID 65535
static DECLARE_BITMAP(callid_bitmap, MAX_CALLID + 1);
static struct pppox_sock __rcu **callid_sock;
static DEFINE_SPINLOCK(chan_lock);
static struct proto pptp_sk_proto __read_mostly;
static const struct ppp_channel_ops pptp_chan_ops;
static const struct proto_ops pptp_ops;
static struct pppox_sock *lookup_chan(u16 call_id, __be32 s_addr)
{
struct pppox_sock *sock;
struct pptp_opt *opt;
rcu_read_lock();
sock = rcu_dereference(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));
}
rcu_read_unlock();
return sock;
}
static int lookup_chan_dst(u16 call_id, __be32 d_addr)
{
struct pppox_sock *sock;
struct pptp_opt *opt;
int i;
rcu_read_lock();
i = 1;
for_each_set_bit_from(i, callid_bitmap, MAX_CALLID) {
sock = rcu_dereference(callid_sock[i]);
if (!sock)
continue;
opt = &sock->proto.pptp;
if (opt->dst_addr.call_id == call_id &&
opt->dst_addr.sin_addr.s_addr == d_addr)
break;
}
rcu_read_unlock();
return i < MAX_CALLID;
}
static int add_chan(struct pppox_sock *sock,
struct pptp_addr *sa)
{
static int call_id;
spin_lock(&chan_lock);
if (!sa->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);
if (call_id == MAX_CALLID)
goto out_err;
}
sa->call_id = call_id;
} else if (test_bit(sa->call_id, callid_bitmap)) {
goto out_err;
}
sock->proto.pptp.src_addr = *sa;
set_bit(sa->call_id, callid_bitmap);
rcu_assign_pointer(callid_sock[sa->call_id], sock);
spin_unlock(&chan_lock);
return 0;
out_err:
spin_unlock(&chan_lock);
return -1;
}
static void del_chan(struct pppox_sock *sock)
{
spin_lock(&chan_lock);
clear_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap);
RCU_INIT_POINTER(callid_sock[sock->proto.pptp.src_addr.call_id], NULL);
spin_unlock(&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 net *net = sock_net(sk);
struct pptp_opt *opt = &po->proto.pptp;
struct pptp_gre_header *hdr;
unsigned int header_len = sizeof(*hdr);
struct flowi4 fl4;
int islcp;
int len;
unsigned char *data;
__u32 seq_recv;
struct rtable *rt;
struct net_device *tdev;
struct iphdr *iph;
int max_headroom;
if (sk_pppox(po)->sk_state & PPPOX_DEAD)
goto tx_error;
rt = ip_route_output_ports(net, &fl4, NULL,
opt->dst_addr.sin_addr.s_addr,
opt->src_addr.sin_addr.s_addr,
0, 0, IPPROTO_GRE,
RT_TOS(0), 0);
if (IS_ERR(rt))
goto tx_error;
tdev = rt->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);
consume_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->gre_hd.flags = GRE_KEY | GRE_VERSION_1 | GRE_SEQ;
hdr->gre_hd.protocol = GRE_PROTO_PPP;
hdr->call_id = htons(opt->dst_addr.call_id);
hdr->seq = htonl(++opt->seq_sent);
if (opt->ack_sent != seq_recv) {
/* send ack with this message */
hdr->gre_hd.flags |= GRE_ACK;
hdr->ack = htonl(seq_recv);
opt->ack_sent = seq_recv;
}
hdr->payload_len = htons(len);
/* 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->dst))
iph->frag_off = htons(IP_DF);
else
iph->frag_off = 0;
iph->protocol = IPPROTO_GRE;
iph->tos = 0;
iph->daddr = fl4.daddr;
iph->saddr = fl4.saddr;
iph->ttl = ip4_dst_hoplimit(&rt->dst);
iph->tot_len = htons(skb->len);
skb_dst_drop(skb);
skb_dst_set(skb, &rt->dst);
nf_reset(skb);
skb->ip_summed = CHECKSUM_NONE;
ip_select_ident(net, skb, NULL);
ip_send_check(iph);
ip_local_out(net, skb->sk, skb);
return 1;
tx_error:
kfree_skb(skb);
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);
headersize = sizeof(*header);
/* test if acknowledgement present */
if (GRE_IS_ACK(header->gre_hd.flags)) {
__u32 ack;
if (!pskb_may_pull(skb, headersize))
goto drop;
header = (struct pptp_gre_header *)(skb->data);
/* ack in different place if S = 0 */
ack = GRE_IS_SEQ(header->gre_hd.flags) ? header->ack : header->seq;
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;
} else {
headersize -= sizeof(header->ack);
}
/* test if payload present */
if (!GRE_IS_SEQ(header->gre_hd.flags))
goto drop;
payload_len = ntohs(header->payload_len);
seq = ntohl(header->seq);
/* check for incomplete packet (length smaller than expected) */
if (!pskb_may_pull(skb, headersize + payload_len))
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)))
goto allow_packet;
} else {
opt->seq_recv = seq;
allow_packet:
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 */
*(u8 *)skb_push(skb, 1) = 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 (header->gre_hd.protocol != GRE_PROTO_PPP || /* PPTP-GRE protocol for PPTP */
GRE_IS_CSUM(header->gre_hd.flags) || /* flag CSUM should be clear */
GRE_IS_ROUTING(header->gre_hd.flags) || /* flag ROUTING should be clear */
!GRE_IS_KEY(header->gre_hd.flags) || /* flag KEY should be set */
(header->gre_hd.flags & GRE_FLAGS)) /* flag Recursion Ctrl should be clear */
/* if invalid, discard this packet */
goto drop;
po = lookup_chan(htons(header->call_id), iph->saddr);
if (po) {
skb_dst_drop(skb);
nf_reset(skb);
return sk_receive_skb(sk_pppox(po), skb, 0);
}
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);
int error = 0;
if (sockaddr_len < sizeof(struct sockaddr_pppox))
return -EINVAL;
lock_sock(sk);
if (sk->sk_state & PPPOX_DEAD) {
error = -EALREADY;
goto out;
}
if (sk->sk_state & PPPOX_BOUND) {
error = -EBUSY;
goto out;
}
if (add_chan(po, &sp->sa_addr.pptp))
error = -EBUSY;
else
sk->sk_state |= PPPOX_BOUND;
out:
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;
struct flowi4 fl4;
int error = 0;
if (sockaddr_len < sizeof(struct sockaddr_pppox))
return -EINVAL;
if (sp->sa_protocol != PX_PROTO_PPTP)
return -EINVAL;
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;
rt = ip_route_output_ports(sock_net(sk), &fl4, sk,
opt->dst_addr.sin_addr.s_addr,
opt->src_addr.sin_addr.s_addr,
0, 0,
IPPROTO_GRE, RT_CONN_FLAGS(sk), 0);
if (IS_ERR(rt)) {
error = -EHOSTUNREACH;
goto end;
}
sk_setup_caps(sk, &rt->dst);
po->chan.mtu = dst_mtu(&rt->dst);
if (!po->chan.mtu)
po->chan.mtu = PPP_MRU;
po->chan.mtu -= PPTP_HEADER_OVERHEAD;
po->chan.hdrlen = 2 + sizeof(struct pptp_gre_header);
error = ppp_register_channel(&po->chan);
if (error) {
pr_err("PPTP: failed to register PPP channel (%d)\n", error);
goto end;
}
opt->dst_addr = sp->sa_addr.pptp;
sk->sk_state |= PPPOX_CONNECTED;
end:
release_sock(sk);
return error;
}
static int pptp_getname(struct socket *sock, struct sockaddr *uaddr,
int peer)
{
int len = sizeof(struct sockaddr_pppox);
struct sockaddr_pppox sp;
memset(&sp.sa_addr, 0, sizeof(sp.sa_addr));
sp.sa_family = AF_PPPOX;
sp.sa_protocol = PX_PROTO_PPTP;
sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr;
memcpy(uaddr, &sp, len);
return len;
}
static int pptp_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct pppox_sock *po;
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);
del_chan(po);
synchronize_rcu();
pppox_unbind_sock(sk);
sk->sk_state = PPPOX_DEAD;
sock_orphan(sk);
sock->sk = NULL;
release_sock(sk);
sock_put(sk);
return error;
}
static void pptp_sock_destruct(struct sock *sk)
{
if (!(sk->sk_state & PPPOX_DEAD)) {
del_chan(pppox_sk(sk));
pppox_unbind_sock(sk);
}
skb_queue_purge(&sk->sk_receive_queue);
}
static int pptp_create(struct net *net, struct socket *sock, int kern)
{
int error = -ENOMEM;
struct sock *sk;
struct pppox_sock *po;
struct pptp_opt *opt;
sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pptp_sk_proto, kern);
if (!sk)
goto out;
sock_init_data(sock, sk);
sock->state = SS_UNCONNECTED;
sock->ops = &pptp_ops;
sk->sk_backlog_rcv = pptp_rcv_core;
sk->sk_state = PPPOX_NONE;
sk->sk_type = SOCK_STREAM;
sk->sk_family = PF_PPPOX;
sk->sk_protocol = PX_PROTO_PPTP;
sk->sk_destruct = pptp_sock_destruct;
po = pppox_sk(sk);
opt = &po->proto.pptp;
opt->seq_sent = 0; opt->seq_recv = 0xffffffff;
opt->ack_recv = 0; opt->ack_sent = 0xffffffff;
error = 0;
out:
return error;
}
static int pptp_ppp_ioctl(struct ppp_channel *chan, unsigned int cmd,
unsigned long arg)
{
struct sock *sk = (struct sock *) chan->private;
struct pppox_sock *po = pppox_sk(sk);
struct pptp_opt *opt = &po->proto.pptp;
void __user *argp = (void __user *)arg;
int __user *p = argp;
int err, val;
err = -EFAULT;
switch (cmd) {
case PPPIOCGFLAGS:
val = opt->ppp_flags;
if (put_user(val, p))
break;
err = 0;
break;
case PPPIOCSFLAGS:
if (get_user(val, p))
break;
opt->ppp_flags = val & ~SC_RCV_BITS;
err = 0;
break;
default:
err = -ENOTTY;
}
return err;
}
static const struct ppp_channel_ops pptp_chan_ops = {
.start_xmit = pptp_xmit,
.ioctl = pptp_ppp_ioctl,
};
static struct proto pptp_sk_proto __read_mostly = {
.name = "PPTP",
.owner = THIS_MODULE,
.obj_size = sizeof(struct pppox_sock),
};
static const struct proto_ops pptp_ops = {
.family = AF_PPPOX,
.owner = THIS_MODULE,
.release = pptp_release,
.bind = pptp_bind,
.connect = pptp_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = pptp_getname,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.setsockopt = sock_no_setsockopt,
.getsockopt = sock_no_getsockopt,
.sendmsg = sock_no_sendmsg,
.recvmsg = sock_no_recvmsg,
.mmap = sock_no_mmap,
.ioctl = pppox_ioctl,
};
static const struct pppox_proto pppox_pptp_proto = {
.create = pptp_create,
.owner = THIS_MODULE,
};
static const struct gre_protocol gre_pptp_protocol = {
.handler = pptp_rcv,
};
static int __init pptp_init_module(void)
{
int err = 0;
pr_info("PPTP driver version " PPTP_DRIVER_VERSION "\n");
callid_sock = vzalloc(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 (xeb@mail.ru)");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_PPTP);
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