diff options
Diffstat (limited to 'kernel/driver/pptp.c')
| -rw-r--r-- | kernel/driver/pptp.c | 1238 |
1 files changed, 0 insertions, 1238 deletions
diff --git a/kernel/driver/pptp.c b/kernel/driver/pptp.c deleted file mode 100644 index 696d4075..00000000 --- a/kernel/driver/pptp.c +++ /dev/null @@ -1,1238 +0,0 @@ -/* - * Point-to-Point Tunneling Protocol for Linux - * - * Authors: Kozlov D. (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/init.h> -#include <linux/ppp_channel.h> -#include <linux/ppp_defs.h> -#include "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> - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -#include <asm/bitops.h> -#endif - -#include <net/sock.h> -#include <net/protocol.h> -#include <net/ip.h> -#include <net/icmp.h> -#include <net/route.h> - -#include <asm/uaccess.h> - -#define DEBUG -//#define CONFIG_GRE - -#if defined(CONFIG_GRE) || defined(CONFIG_GRE_MODULE) -#include "gre.h" -#endif - -#define PPTP_DRIVER_VERSION "0.8.5-rc1" - -static int log_level=0; -static int log_packets=10; - -#define MAX_CALLID 65535 -#define PPP_LCP_ECHOREQ 0x09 -#define PPP_LCP_ECHOREP 0x0A - -static DECLARE_BITMAP(callid_bitmap, MAX_CALLID + 1); -static struct pppox_sock **callid_sock; - -#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP) - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -#define INIT_TIMER(_timer,_routine,_data) \ -do { \ - (_timer)->function=_routine; \ - (_timer)->data=_data; \ - init_timer(_timer); \ -} while (0); - -static inline void *kzalloc(size_t size,int gfp) -{ - void *p=kmalloc(size,gfp); - memset(p,0,size); - return p; -} - -#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,20) -static inline void nf_reset(struct sk_buff *skb) -{ -#ifdef CONFIG_NETFILTER - nf_conntrack_put(skb->nfct); - skb->nfct=NULL; -#ifdef CONFIG_NETFILTER_DEBUG - skb->nf_debug=0; -#endif -#endif -} -#define __user -#endif - -/** - * __ffs - find first bit in word. - * @word: The word to search - * - * Undefined if no bit exists, so code should check against 0 first. - */ -static inline unsigned long __ffs(unsigned long word) -{ - int num = 0; - -#if BITS_PER_LONG == 64 - if ((word & 0xffffffff) == 0) { - num += 32; - word >>= 32; - } -#endif - if ((word & 0xffff) == 0) { - num += 16; - word >>= 16; - } - if ((word & 0xff) == 0) { - num += 8; - word >>= 8; - } - if ((word & 0xf) == 0) { - num += 4; - word >>= 4; - } - if ((word & 0x3) == 0) { - num += 2; - word >>= 2; - } - if ((word & 0x1) == 0) - num += 1; - return num; -} - -#define BITOP_WORD(nr) ((nr) / BITS_PER_LONG) -/* - * Find the next set bit in a memory region. - */ -static unsigned long find_next_bit(const unsigned long *addr, unsigned long size, - unsigned long offset) -{ - const unsigned long *p = addr + BITOP_WORD(offset); - unsigned long result = offset & ~(BITS_PER_LONG-1); - unsigned long tmp; - - if (offset >= size) - return size; - size -= result; - offset %= BITS_PER_LONG; - if (offset) { - tmp = *(p++); - tmp &= (~0UL << offset); - if (size < BITS_PER_LONG) - goto found_first; - if (tmp) - goto found_middle; - size -= BITS_PER_LONG; - result += BITS_PER_LONG; - } - while (size & ~(BITS_PER_LONG-1)) { - if ((tmp = *(p++))) - goto found_middle; - result += BITS_PER_LONG; - size -= BITS_PER_LONG; - } - if (!size) - return result; - tmp = *p; - -found_first: - tmp &= (~0UL >> (BITS_PER_LONG - size)); - if (tmp == 0UL) /* Are any bits set? */ - return result + size; /* Nope. */ -found_middle: - return result + __ffs(tmp); -} -#endif - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -static rwlock_t chan_lock=RW_LOCK_UNLOCKED; -#define SK_STATE(sk) (sk)->state -#else -static DEFINE_SPINLOCK(chan_lock); -#define SK_STATE(sk) (sk)->sk_state -#endif - -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) - -struct pptp_gre_header { - u8 flags; /* bitfield */ - u8 ver; /* should be PPTP_GRE_VER (enhanced GRE) */ - u16 protocol; /* should be PPTP_GRE_PROTO (ppp-encaps) */ - u16 payload_len; /* size of ppp payload, not inc. gre header */ - u16 call_id; /* peer's call_id for this session */ - u32 seq; /* sequence number. Present if S==1 */ - u32 ack; /* seq number of highest packet recieved by */ - /* sender in this session */ -} __packed; -#define PPTP_HEADER_OVERHEAD (2+sizeof(struct pptp_gre_header)) - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -static struct pppox_sock * lookup_chan(u16 call_id, u32 s_addr) -#else -static struct pppox_sock * lookup_chan(u16 call_id, __be32 s_addr) -#endif -{ - struct pppox_sock *sock; - struct pptp_opt *opt; - -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - rcu_read_lock(); - sock = rcu_dereference(callid_sock[call_id]); -#else - read_lock(&chan_lock); - sock = callid_sock[call_id]; -#endif - if (sock) { - opt=&sock->proto.pptp; - if (opt->dst_addr.sin_addr.s_addr!=s_addr) sock=NULL; - else sock_hold(sk_pppox(sock)); - } -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - rcu_read_unlock(); -#else - read_unlock(&chan_lock); -#endif - - return sock; -} - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -static int lookup_chan_dst(u16 call_id, u32 d_addr) -#else -static int lookup_chan_dst(u16 call_id, __be32 d_addr) -#endif -{ - struct pppox_sock *sock; - struct pptp_opt *opt; - int i; - -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - rcu_read_lock(); -#else - down(&chan_lock); -#endif - 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; - } -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - rcu_read_unlock(); -#else - up(&chan_lock); -#endif - - return i<MAX_CALLID; -} - -static int add_chan(struct pppox_sock *sock) -{ - static int call_id=0; - int res=-1; - -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - spin_lock(&chan_lock); -#else - write_lock_bh(&chan_lock); -#endif - - 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); -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - rcu_assign_pointer(callid_sock[sock->proto.pptp.src_addr.call_id],sock); -#else - callid_sock[sock->proto.pptp.src_addr.call_id] = sock; -#endif - res=0; - -exit: - #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - spin_unlock(&chan_lock); - #else - write_unlock_bh(&chan_lock); - #endif - - return res; -} - -static void del_chan(struct pppox_sock *sock) -{ -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - spin_lock(&chan_lock); -#else - write_lock_bh(&chan_lock); -#endif - clear_bit(sock->proto.pptp.src_addr.call_id,callid_bitmap); -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - rcu_assign_pointer(callid_sock[sock->proto.pptp.src_addr.call_id],NULL); - spin_unlock(&chan_lock); - synchronize_rcu(); -#else - callid_sock[sock->proto.pptp.src_addr.call_id] = NULL; - write_unlock_bh(&chan_lock); -#endif -} - -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_STATE(sk_pppox(po)) & PPPOX_DEAD) - goto tx_error; - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - { - struct rt_key key = { - .dst=opt->dst_addr.sin_addr.s_addr, - .src=opt->src_addr.sin_addr.s_addr, - .tos=RT_TOS(0), - }; - if ((err=ip_route_output_key(&rt, &key))) { - goto tx_error; - } - } -#else - { - 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 LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) - if ((err=ip_route_output_key(&rt, &fl))) { -#else - if ((err=ip_route_output_key(&init_net,&rt, &fl))) { -#endif - goto tx_error; - } - } -#endif - tdev = rt->u.dst.dev; - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - max_headroom = ((tdev->hard_header_len+15)&~15) + sizeof(*iph)+sizeof(*hdr)+2; -#else - max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(*iph)+sizeof(*hdr)+2; -#endif - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22) - if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) { -#else - if (skb_headroom(skb) < max_headroom || skb_shared(skb) || - (skb_cloned(skb) && !skb_clone_writable(skb,0))) { -#endif - 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. - */ - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31) - skb_reset_transport_header(skb); - skb_push(skb, sizeof(*iph)); - skb_reset_network_header(skb); -#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) - skb->transport_header = skb->network_header; - skb_push(skb, sizeof(*iph)); - skb_reset_network_header(skb); -#else - skb->h.raw = skb->nh.raw; - skb->nh.raw = skb_push(skb, sizeof(*iph)); -#endif - memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) - IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | - IPSKB_REROUTED); -#endif - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) - iph = ip_hdr(skb); -#else - iph = skb->nh.iph; -#endif - 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; -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - iph->ttl = sk->protinfo.af_inet.ttl; -#else - iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT); -#endif - iph->tot_len = htons(skb->len); - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31) - skb_dst_drop(skb); - skb_dst_set(skb,&rt->u.dst); -#else - dst_release(skb->dst); - skb->dst = &rt->u.dst; -#endif - - nf_reset(skb); - - skb->ip_summed = CHECKSUM_NONE; - ip_select_ident(iph, &rt->u.dst, NULL); - ip_send_check(iph); - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, ip_send); -#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) - err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, dst_output); -#else - err = ip_local_out(skb); -#endif - -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_STATE(sk) & 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; -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,21) - skb_set_network_header(skb,skb->head-skb->data); -#endif - 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 LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) - int ret; - struct sock *sk; -#endif - - if (skb->pkt_type != PACKET_HOST) - goto drop; - - /*if (!pskb_may_pull(skb, 12)) - goto drop;*/ - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) - iph = ip_hdr(skb); -#else - iph = skb->nh.iph; -#endif - - 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))) { -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31) - skb_dst_drop(skb); -#else - dst_release(skb->dst); - skb->dst = NULL; -#endif - nf_reset(skb); -#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) - sk=sk_pppox(po); - bh_lock_sock(sk); - /* Socket state is unknown, must put skb into backlog. */ - if (sk->lock.users != 0) { - sk_add_backlog(sk, skb); - ret = NET_RX_SUCCESS; - } else { - ret = pptp_rcv_core(sk, skb); - } - bh_unlock_sock(sk); - sock_put(sk); - return ret; - -#else /* LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) */ - -#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,19) - return sk_receive_skb(sk_pppox(po), skb); -#else - return sk_receive_skb(sk_pppox(po), skb, 0); -#endif - -#endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) */ - }else { -#ifdef DEBUG - if (log_level>=1) - printk(KERN_INFO"PPTP: Discarding packet from unknown call_id %i\n",htons(header->call_id)); -#endif - } - -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_STATE(sk) & PPPOX_CONNECTED){ - error = -EBUSY; - goto end; - } - - /* Check for already disconnected sockets, on attempts to disconnect */ - if (SK_STATE(sk) & 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; - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - { - struct rt_key key = { - .dst=opt->dst_addr.sin_addr.s_addr, - .src=opt->src_addr.sin_addr.s_addr, - .tos=RT_TOS(0), - }; -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) - if (ip_route_output_key(&rt, &key)) { -#else - if (ip_route_output_key(&init_net, &rt, &key)) { -#endif - error = -EHOSTUNREACH; - goto end; - } - } -#else - { - 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 }; -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18) - security_sk_classify_flow(sk, &fl); -#endif -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) - if (ip_route_output_key(&rt, &fl)){ -#else - if (ip_route_output_key(&init_net, &rt, &fl)){ -#endif - error = -EHOSTUNREACH; - goto end; - } - sk_setup_caps(sk, &rt->u.dst); - } -#endif -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - po->chan.mtu=PPP_MTU; -#else - po->chan.mtu=dst_mtu(&rt->u.dst); - if (!po->chan.mtu) po->chan.mtu=PPP_MTU; -#endif - 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_STATE(sk) = 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 LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - if (sk->dead) -#else - if (sock_flag(sk, SOCK_DEAD)) -#endif - { - release_sock(sk); - return -EBADF; - } - - po = pppox_sk(sk); - opt=&po->proto.pptp; - del_chan(po); - - pppox_unbind_sock(sk); - SK_STATE(sk) = 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; -} - - -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) -static struct proto pptp_sk_proto = { - .name = "PPTP", - .owner = THIS_MODULE, - .obj_size = sizeof(struct pppox_sock), -}; -#endif - -static struct proto_ops pptp_ops = { - .family = AF_PPPOX, -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - .owner = THIS_MODULE, -#endif - .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, -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) - .ioctl = pppox_ioctl, -#endif -}; - - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -static void pptp_sock_destruct(struct sock *sk) -{ - skb_queue_purge(&sk->receive_queue); - if (!(SK_STATE(sk) & PPPOX_DEAD)) { - del_chan(pppox_sk(sk)); - pppox_unbind_sock(sk); - } - if (sk->protinfo.destruct_hook) - kfree(sk->protinfo.destruct_hook); - - MOD_DEC_USE_COUNT; -} - -static int pptp_create(struct socket *sock) -{ - int error = -ENOMEM; - struct sock *sk; - struct pppox_sock *po; - struct pptp_opt *opt; - - MOD_INC_USE_COUNT; - - sk = sk_alloc(PF_PPPOX, GFP_KERNEL, 1); - if (!sk) - goto out; - - sock_init_data(sock, sk); - - sock->state = SS_UNCONNECTED; - sock->ops = &pptp_ops; - - //sk->sk_backlog_rcv = pppoe_rcv_core; - sk->state = PPPOX_NONE; - sk->type = SOCK_STREAM; - sk->family = PF_PPPOX; - sk->protocol = PX_PROTO_PPTP; - - sk->protinfo.pppox=kzalloc(sizeof(struct pppox_sock),GFP_KERNEL); - sk->destruct=pptp_sock_destruct; - sk->protinfo.destruct_hook=sk->protinfo.pppox; - - po = pppox_sk(sk); - po->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; -} -#else -static void pptp_sock_destruct(struct sock *sk) -{ - if (!(SK_STATE(sk) & PPPOX_DEAD)){ - del_chan(pppox_sk(sk)); - pppox_unbind_sock(sk); - } - skb_queue_purge(&sk->sk_receive_queue); -} -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24) -static int pptp_create(struct socket *sock) -#else -static int pptp_create(struct net *net, struct socket *sock) -#endif -{ - int error = -ENOMEM; - struct sock *sk; - struct pppox_sock *po; - struct pptp_opt *opt; - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24) - sk = sk_alloc(PF_PPPOX, GFP_KERNEL, &pptp_sk_proto, 1); -#else - sk = sk_alloc(net,PF_PPPOX, GFP_KERNEL, &pptp_sk_proto); -#endif - 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); -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - po->sk=sk; -#endif - 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; -} -#endif - - -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, -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15) - .owner = THIS_MODULE, -#endif -}; - -#if defined(CONFIG_GRE) || defined(CONFIG_GRE_MODULE) -static struct gre_protocol gre_pptp_protocol = { - .handler = pptp_rcv, -}; -#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -static struct inet_protocol net_pptp_protocol = { - .handler = pptp_rcv, - .protocol = IPPROTO_GRE, - .name = "PPTP", -}; -#else -static struct net_protocol net_pptp_protocol = { - .handler = pptp_rcv, -}; -#endif - -static int __init pptp_init_module(void) -{ - int err=0; - printk(KERN_INFO "PPTP driver version " PPTP_DRIVER_VERSION "\n"); - -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - callid_sock = __vmalloc((MAX_CALLID + 1) * sizeof(void *), - GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); -#else - callid_sock = __vmalloc((MAX_CALLID + 1) * sizeof(void *), - GFP_KERNEL, PAGE_KERNEL); - memset(callid_sock, 0, (MAX_CALLID + 1) * sizeof(void *)); -#endif - if (!callid_sock) { - printk(KERN_ERR "PPTP: cann't allocate memory\n"); - return -ENOMEM; - } - -#if defined(CONFIG_GRE) || defined(CONFIG_GRE_MODULE) - if (gre_add_protocol(&gre_pptp_protocol, GREPROTO_PPTP) < 0) { - printk(KERN_INFO "PPTP: can't add protocol\n"); - goto out_free_mem; - } -#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - inet_add_protocol(&net_pptp_protocol); -#else - if (inet_add_protocol(&net_pptp_protocol, IPPROTO_GRE) < 0) { - printk(KERN_INFO "PPTP: can't add protocol\n"); - goto out_free_mem; - } -#endif - -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - err = proto_register(&pptp_sk_proto, 0); - if (err){ - printk(KERN_INFO "PPTP: can't register sk_proto\n"); - goto out_inet_del_protocol; - } -#endif - - 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; - } - - return 0; -out_unregister_sk_proto: -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - proto_unregister(&pptp_sk_proto); -#endif - -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) -out_inet_del_protocol: -#endif - -#if defined(CONFIG_GRE) || defined(CONFIG_GRE_MODULE) - gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP); -#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - inet_del_protocol(&net_pptp_protocol); -#else - inet_del_protocol(&net_pptp_protocol, IPPROTO_GRE); -#endif -out_free_mem: - vfree(callid_sock); - - return err; -} - -static void __exit pptp_exit_module(void) -{ - unregister_pppox_proto(PX_PROTO_PPTP); -#if defined(CONFIG_GRE) || defined(CONFIG_GRE_MODULE) -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - proto_unregister(&pptp_sk_proto); -#endif - gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP); -#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - inet_del_protocol(&net_pptp_protocol); -#else - proto_unregister(&pptp_sk_proto); - inet_del_protocol(&net_pptp_protocol, IPPROTO_GRE); -#endif - vfree(callid_sock); -} - -module_init(pptp_init_module); -module_exit(pptp_exit_module); - -MODULE_DESCRIPTION("Point-to-Point Tunneling Protocol for Linux"); -MODULE_AUTHOR("Kozlov D. (xeb@mail.ru)"); -MODULE_LICENSE("GPL"); - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -MODULE_PARM(log_level,"i"); -MODULE_PARM(log_packets,"i"); -#else -module_param(log_level,int,0); -module_param(log_packets,int,0); -#endif -MODULE_PARM_DESC(log_level,"Logging level (default=0)"); - |