From 07264d491f0605088c94e8be9f2b593dd4882067 Mon Sep 17 00:00:00 2001 From: Kozlov Dmitry Date: Tue, 26 Jun 2012 19:17:34 +0400 Subject: ipoe: initial implementation of kernel module --- CMakeLists.txt | 7 +- driver/CMakeLists.txt | 19 - driver/Makefile | 4 - driver/gre.c | 220 -------- driver/gre.h | 18 - driver/if_pppox.h | 222 -------- driver/pptp.c | 1272 ------------------------------------------- drivers/ipoe/CMakeLists.txt | 19 + drivers/ipoe/Makefile | 4 + drivers/ipoe/ipoe.c | 709 ++++++++++++++++++++++++ drivers/ipoe/ipoe.h | 33 ++ drivers/pptp/CMakeLists.txt | 19 + drivers/pptp/Makefile | 4 + drivers/pptp/gre.c | 220 ++++++++ drivers/pptp/gre.h | 18 + drivers/pptp/if_pppox.h | 222 ++++++++ drivers/pptp/pptp.c | 1272 +++++++++++++++++++++++++++++++++++++++++++ ipoe-util/CMakeLists.txt | 20 + ipoe-util/ipoe.h | 1 + ipoe-util/ipses-create.c | 61 +++ ipoe-util/ipses-delete.c | 58 ++ 21 files changed, 2666 insertions(+), 1756 deletions(-) delete mode 100644 driver/CMakeLists.txt delete mode 100644 driver/Makefile delete mode 100644 driver/gre.c delete mode 100644 driver/gre.h delete mode 100644 driver/if_pppox.h delete mode 100644 driver/pptp.c create mode 100644 drivers/ipoe/CMakeLists.txt create mode 100644 drivers/ipoe/Makefile create mode 100644 drivers/ipoe/ipoe.c create mode 100644 drivers/ipoe/ipoe.h create mode 100644 drivers/pptp/CMakeLists.txt create mode 100644 drivers/pptp/Makefile create mode 100644 drivers/pptp/gre.c create mode 100644 drivers/pptp/gre.h create mode 100644 drivers/pptp/if_pppox.h create mode 100644 drivers/pptp/pptp.c create mode 100644 ipoe-util/CMakeLists.txt create mode 120000 ipoe-util/ipoe.h create mode 100644 ipoe-util/ipses-create.c create mode 100644 ipoe-util/ipses-delete.c diff --git a/CMakeLists.txt b/CMakeLists.txt index 78ff7ad0..f358ce38 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -33,6 +33,11 @@ if (NOT BUILD_DRIVER_ONLY) endif (NOT BUILD_DRIVER_ONLY) if (BUILD_DRIVER OR BUILD_DRIVER_ONLY) - add_subdirectory(driver) + add_subdirectory(drivers/pptp) endif (BUILD_DRIVER OR BUILD_DRIVER_ONLY) +if (BUILD_IPOE_DRIVER) + add_subdirectory(drivers/ipoe) + add_subdirectory(ipoe-util) + +endif (BUILD_IPOE_DRIVER) diff --git a/driver/CMakeLists.txt b/driver/CMakeLists.txt deleted file mode 100644 index fd732e6a..00000000 --- a/driver/CMakeLists.txt +++ /dev/null @@ -1,19 +0,0 @@ -if (NOT DEFINED KDIR) - set(KDIR "/usr/src/linux") -endif (NOT DEFINED KDIR) - -ADD_CUSTOM_COMMAND(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/driver/pptp.ko - COMMAND rm -rf ${CMAKE_CURRENT_BINARY_DIR}/driver - COMMAND mkdir ${CMAKE_CURRENT_BINARY_DIR}/driver - COMMAND ln -sf ${CMAKE_CURRENT_SOURCE_DIR}/* ${CMAKE_CURRENT_BINARY_DIR}/driver - COMMAND make -C ${KDIR} M=${CMAKE_CURRENT_BINARY_DIR}/driver modules - DEPENDS pptp.c -) - -ADD_CUSTOM_TARGET(pptp_drv ALL - DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/driver/pptp.ko -) - -IF (NOT DEFINED CPACK_TYPE) - INSTALL(CODE "EXECUTE_PROCESS(COMMAND make -C ${KDIR} M=${CMAKE_CURRENT_BINARY_DIR}/driver modules_install)") -ENDIF (NOT DEFINED CPACK_TYPE) diff --git a/driver/Makefile b/driver/Makefile deleted file mode 100644 index 8ccbbedf..00000000 --- a/driver/Makefile +++ /dev/null @@ -1,4 +0,0 @@ -obj-m += pptp.o - -default: - make -C $(KDIR) M=$(PWD) modules diff --git a/driver/gre.c b/driver/gre.c deleted file mode 100644 index 77886d5d..00000000 --- a/driver/gre.c +++ /dev/null @@ -1,220 +0,0 @@ -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "gre.h" - -struct gre_protocol *gre_proto[GREPROTO_MAX] ____cacheline_aligned_in_smp; -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -static rwlock_t gre_proto_lock=RW_LOCK_UNLOCKED; -#else -static DEFINE_SPINLOCK(gre_proto_lock); -#endif - -int gre_add_protocol(struct gre_protocol *proto, u8 version) -{ - int ret; - - if (version >= GREPROTO_MAX) - return -EINVAL; - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - write_lock_bh(&gre_proto_lock); -#else - spin_lock(&gre_proto_lock); -#endif - if (gre_proto[version]) { - ret = -EAGAIN; - } else { -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - gre_proto[version] = proto; -#else - rcu_assign_pointer(gre_proto[version], proto); -#endif - ret = 0; - } -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - write_unlock_bh(&gre_proto_lock); -#else - spin_unlock(&gre_proto_lock); -#endif - - return ret; -} - -int gre_del_protocol(struct gre_protocol *proto, u8 version) -{ - if (version >= GREPROTO_MAX) - goto out_err; - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - write_lock_bh(&gre_proto_lock); -#else - spin_lock(&gre_proto_lock); -#endif - if (gre_proto[version] == proto) -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - gre_proto[version] = NULL; -#else - rcu_assign_pointer(gre_proto[version], NULL); -#endif - else - goto out_err_unlock; -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - write_unlock_bh(&gre_proto_lock); -#else - spin_unlock(&gre_proto_lock); - synchronize_rcu(); -#endif - return 0; - -out_err_unlock: -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - write_unlock_bh(&gre_proto_lock); -#else - spin_unlock(&gre_proto_lock); -#endif -out_err: - return -EINVAL; -} - -static int gre_rcv(struct sk_buff *skb) -{ - u8 ver; - int ret; - struct gre_protocol *proto; - - if (!pskb_may_pull(skb, 12)) - goto drop_nolock; - - ver = skb->data[1]&0x7f; - if (ver >= GREPROTO_MAX) - goto drop_nolock; - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - read_lock(&gre_proto_lock); - proto = gre_proto[ver]; -#else - rcu_read_lock(); - proto = rcu_dereference(gre_proto[ver]); -#endif - if (!proto || !proto->handler) - goto drop; - - ret = proto->handler(skb); - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - read_unlock(&gre_proto_lock); -#else - rcu_read_unlock(); -#endif - - return ret; - -drop: -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - read_unlock(&gre_proto_lock); -#else - rcu_read_unlock(); -#endif -drop_nolock: - kfree_skb(skb); - return NET_RX_DROP; -} - -static void gre_err(struct sk_buff *skb, u32 info) -{ - u8 ver; - struct gre_protocol *proto; - - if (!pskb_may_pull(skb, 12)) - goto drop_nolock; - - ver=skb->data[1]&0x7f; - if (ver>=GREPROTO_MAX) - goto drop_nolock; - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - read_lock(&gre_proto_lock); - proto = gre_proto[ver]; -#else - rcu_read_lock(); - proto = rcu_dereference(gre_proto[ver]); -#endif - if (!proto || !proto->err_handler) - goto drop; - - proto->err_handler(skb, info); -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - read_unlock(&gre_proto_lock); -#else - rcu_read_unlock(); -#endif - - return; - -drop: -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - read_unlock(&gre_proto_lock); -#else - rcu_read_unlock(); -#endif -drop_nolock: - kfree_skb(skb); -} - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -static struct inet_protocol net_gre_protocol = { - .handler = gre_rcv, - .err_handler = gre_err, - .protocol = IPPROTO_GRE, - .name = "GRE", -}; -#else -static struct net_protocol net_gre_protocol = { - .handler = gre_rcv, - .err_handler = gre_err, -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,24) - .netns_ok=1, -#endif -}; -#endif - -static int __init gre_init(void) -{ - printk(KERN_INFO "GRE over IPv4 demultiplexor driver"); - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - inet_add_protocol(&net_gre_protocol); -#else - if (inet_add_protocol(&net_gre_protocol, IPPROTO_GRE) < 0) { - printk(KERN_INFO "gre: can't add protocol\n"); - return -EAGAIN; - } -#endif - return 0; -} - -static void __exit gre_exit(void) -{ -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - inet_del_protocol(&net_gre_protocol); -#else - inet_del_protocol(&net_gre_protocol, IPPROTO_GRE); -#endif -} - -module_init(gre_init); -module_exit(gre_exit); - -MODULE_DESCRIPTION("GRE over IPv4 demultiplexor driver"); -MODULE_AUTHOR("Kozlov D. (xeb@mail.ru)"); -MODULE_LICENSE("GPL"); -EXPORT_SYMBOL_GPL(gre_add_protocol); -EXPORT_SYMBOL_GPL(gre_del_protocol); diff --git a/driver/gre.h b/driver/gre.h deleted file mode 100644 index 2ca7f749..00000000 --- a/driver/gre.h +++ /dev/null @@ -1,18 +0,0 @@ -#ifndef __LINUX_GRE_H -#define __LINUX_GRE_H - -#include - -#define GREPROTO_CISCO 0 -#define GREPROTO_PPTP 1 -#define GREPROTO_MAX 2 - -struct gre_protocol { - int (*handler)(struct sk_buff *skb); - void (*err_handler)(struct sk_buff *skb, u32 info); -}; - -int gre_add_protocol(struct gre_protocol *proto, u8 version); -int gre_del_protocol(struct gre_protocol *proto, u8 version); - -#endif diff --git a/driver/if_pppox.h b/driver/if_pppox.h deleted file mode 100644 index bc05b533..00000000 --- a/driver/if_pppox.h +++ /dev/null @@ -1,222 +0,0 @@ -/*************************************************************************** - * Linux PPP over X - Generic PPP transport layer sockets - * Linux PPP over Ethernet (PPPoE) Socket Implementation (RFC 2516) - * - * This file supplies definitions required by the PPP over Ethernet driver - * (pppox.c). All version information wrt this file is located in pppox.c - * - * License: - * 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. - * - */ - -#ifndef __LINUX_IF_PPPOX_H -#define __LINUX_IF_PPPOX_H - - -#include -#include -#include - -#ifdef __KERNEL__ -#include -#include -#include -#include -#include -#endif /* __KERNEL__ */ - -/* For user-space programs to pick up these definitions - * which they wouldn't get otherwise without defining __KERNEL__ - */ -#ifndef AF_PPPOX -#define AF_PPPOX 24 -#define PF_PPPOX AF_PPPOX -#endif /* !(AF_PPPOX) */ - -/************************************************************************ - * PPPoE addressing definition - */ -typedef __u16 sid_t; -struct pppoe_addr{ - sid_t sid; /* Session identifier */ - unsigned char remote[ETH_ALEN]; /* Remote address */ - char dev[IFNAMSIZ]; /* Local device to use */ -}; - -struct pptp_addr{ - __u16 call_id; - struct in_addr sin_addr; -}; -/************************************************************************ - * Protocols supported by AF_PPPOX - */ -#define PX_PROTO_OE 0 /* Currently just PPPoE */ -#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,22) -#define PX_PROTO_PPTP 1 -#define PX_MAX_PROTO 2 -#else -#define PX_PROTO_PPTP 2 -#define PX_MAX_PROTO 3 -#endif - -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)); - - -/********************************************************************* - * - * ioctl interface for defining forwarding of connections - * - ********************************************************************/ - -#define PPPOEIOCSFWD _IOW(0xB1 ,0, size_t) -#define PPPOEIOCDFWD _IO(0xB1 ,1) -/*#define PPPOEIOCGFWD _IOWR(0xB1,2, size_t)*/ - -/* Codes to identify message types */ -#define PADI_CODE 0x09 -#define PADO_CODE 0x07 -#define PADR_CODE 0x19 -#define PADS_CODE 0x65 -#define PADT_CODE 0xa7 -struct pppoe_tag { - __u16 tag_type; - __u16 tag_len; - char tag_data[0]; -} __attribute ((packed)); - -/* Tag identifiers */ -#define PTT_EOL __constant_htons(0x0000) -#define PTT_SRV_NAME __constant_htons(0x0101) -#define PTT_AC_NAME __constant_htons(0x0102) -#define PTT_HOST_UNIQ __constant_htons(0x0103) -#define PTT_AC_COOKIE __constant_htons(0x0104) -#define PTT_VENDOR __constant_htons(0x0105) -#define PTT_RELAY_SID __constant_htons(0x0110) -#define PTT_SRV_ERR __constant_htons(0x0201) -#define PTT_SYS_ERR __constant_htons(0x0202) -#define PTT_GEN_ERR __constant_htons(0x0203) - -struct pppoe_hdr { -#if defined(__LITTLE_ENDIAN_BITFIELD) - __u8 ver : 4; - __u8 type : 4; -#elif defined(__BIG_ENDIAN_BITFIELD) - __u8 type : 4; - __u8 ver : 4; -#else -#error "Please fix " -#endif - __u8 code; - __u16 sid; - __u16 length; - struct pppoe_tag tag[0]; -} __attribute__ ((packed)); - - -/* Socket options */ -#define PPTP_SO_TIMEOUT 1 - - -#ifdef __KERNEL__ -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) -struct pppoe_opt { - struct net_device *dev; /* device associated with socket*/ - struct pppoe_addr pa; /* what this socket is bound to*/ - struct sockaddr_pppox relay; /* what socket data will be - relayed to (PPPoE relaying) */ -}; -#endif -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; -}; -#define PPTP_FLAG_PAUSE 0 -#define PPTP_FLAG_PROC 1 - -#include - -struct pppox_sock { - /* struct sock must be the first member of pppox_sock */ - #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - struct ppp_channel chan; - struct sock *sk; - #else - struct sock sk; - struct ppp_channel chan; - #endif - struct pppox_sock *next; /* for hash table */ - union { - struct pppoe_opt pppoe; - struct pptp_opt pptp; - } proto; - unsigned short num; -}; -#define pppoe_dev proto.pppoe.dev -#define pppoe_pa proto.pppoe.pa -#define pppoe_relay proto.pppoe.relay - -static inline struct pppox_sock *pppox_sk(struct sock *sk) -{ - #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - return (struct pppox_sock *)sk->protinfo.pppox; - #else - return (struct pppox_sock *)sk; - #endif -} - -static inline struct sock *sk_pppox(struct pppox_sock *po) -{ - #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - return po->sk; - #else - return (struct sock *)po; - #endif -} - -struct module; - -struct pppox_proto { - #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24) - int (*create)(struct socket *sock); - #else - int (*create)(struct net *net, struct socket *sock); - #endif - int (*ioctl)(struct socket *sock, unsigned int cmd, - unsigned long arg); - #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15) - struct module *owner; - #endif -}; - -extern int register_pppox_proto(int proto_num, struct pppox_proto *pp); -extern void unregister_pppox_proto(int proto_num); -extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */ -extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); - -/* PPPoX socket states */ -enum { - PPPOX_NONE = 0, /* initial state */ - PPPOX_CONNECTED = 1, /* connection established ==TCP_ESTABLISHED */ - PPPOX_BOUND = 2, /* bound to ppp device */ - PPPOX_RELAY = 4, /* forwarding is enabled */ - PPPOX_ZOMBIE = 8, /* dead, but still bound to ppp device */ - PPPOX_DEAD = 16 /* dead, useless, please clean me up!*/ -}; - -#endif /* __KERNEL__ */ - -#endif /* !(__LINUX_IF_PPPOX_H) */ diff --git a/driver/pptp.c b/driver/pptp.c deleted file mode 100644 index 78853fcb..00000000 --- a/driver/pptp.c +++ /dev/null @@ -1,1272 +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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include "if_pppox.h" -#include -#include -#include -#include -#include -#include -#include -#include - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) -#include -#endif - -#include -#include -#include -#include -#include - -#include - -#define DEBUG -//#define CONFIG_GRE - -#if defined(CONFIG_GRE) || defined(CONFIG_GRE_MODULE) -#include "gre.h" -#endif - -#define PPTP_DRIVER_VERSION "0.8.5" - -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)){ -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - sock = rcu_dereference(callid_sock[i]); -#else - sock = callid_sock[i]; -#endif - 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; - } -#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) - rcu_read_unlock(); -#else - up(&chan_lock); -#endif - - return i 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; - -#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 - set_bit(sock->proto.pptp.src_addr.call_id,callid_bitmap); - 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 -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) - tdev = rt->u.dst.dev; -#else - tdev = rt->dst.dev; -#endif - -#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 LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) - if (ip_dont_fragment(sk, &rt->u.dst)) -#else - if (ip_dont_fragment(sk, &rt->dst)) -#endif - 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 -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) - iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT); -#else - iph->ttl = dst_metric(&rt->dst, RTAX_HOPLIMIT); -#endif -#endif - iph->tot_len = htons(skb->len); - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31) - skb_dst_drop(skb); -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) - skb_dst_set(skb,&rt->u.dst); -#else - skb_dst_set(skb,&rt->dst); -#endif -#else - dst_release(skb->dst); - skb->dst = &rt->u.dst; -#endif - - nf_reset(skb); - - skb->ip_summed = CHECKSUM_NONE; -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) - ip_select_ident(iph, &rt->u.dst, NULL); -#else - ip_select_ident(iph, &rt->dst, NULL); -#endif - 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; - } -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) - sk_setup_caps(sk, &rt->u.dst); -#else - sk_setup_caps(sk, &rt->dst); -#endif - } -#endif -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) - po->chan.mtu=PPP_MTU; -#else -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) - po->chan.mtu=dst_mtu(&rt->u.dst); -#else - po->chan.mtu=dst_mtu(&rt->dst); -#endif - 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)"); - diff --git a/drivers/ipoe/CMakeLists.txt b/drivers/ipoe/CMakeLists.txt new file mode 100644 index 00000000..fb5a51e4 --- /dev/null +++ b/drivers/ipoe/CMakeLists.txt @@ -0,0 +1,19 @@ +if (NOT DEFINED KDIR) + set(KDIR "/usr/src/linux") +endif (NOT DEFINED KDIR) + +ADD_CUSTOM_COMMAND(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/driver/ipoe.ko + COMMAND rm -rf ${CMAKE_CURRENT_BINARY_DIR}/driver + COMMAND mkdir ${CMAKE_CURRENT_BINARY_DIR}/driver + COMMAND ln -sf ${CMAKE_CURRENT_SOURCE_DIR}/* ${CMAKE_CURRENT_BINARY_DIR}/driver + COMMAND make -C ${KDIR} M=${CMAKE_CURRENT_BINARY_DIR}/driver modules + DEPENDS ipoe.c ipoe.h +) + +ADD_CUSTOM_TARGET(isg_drv ALL + DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/driver/ipoe.ko +) + + +INSTALL(CODE "EXECUTE_PROCESS(COMMAND make -C ${KDIR} M=${CMAKE_CURRENT_BINARY_DIR}/drivers/ipoe modules_install)") + diff --git a/drivers/ipoe/Makefile b/drivers/ipoe/Makefile new file mode 100644 index 00000000..22ea273d --- /dev/null +++ b/drivers/ipoe/Makefile @@ -0,0 +1,4 @@ +obj-m += ipoe.o + +default: + make -C $(KDIR) M=$(PWD) modules diff --git a/drivers/ipoe/ipoe.c b/drivers/ipoe/ipoe.c new file mode 100644 index 00000000..58e4bbdd --- /dev/null +++ b/drivers/ipoe/ipoe.c @@ -0,0 +1,709 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "ipoe.h" + +#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) +#define HASH_SIZE 16 + +#define NEED_UPDATE 1 +#define UPDATE 2 + +struct ipoe_session +{ + struct rb_node node; + + __be32 addr; + __be32 peer_addr; + //__u8 hwaddr[ETH_ALEN]; + + struct net_device *dev; + struct net_device *link_dev; + + /*struct tasklet_struct tasklet; + int tasklet_pending; + + struct u64_status_sync rsync; + u64 rx_packets; + u64 rx_bytes; + struct sk_buff_head rq; + + struct u64_status_sync tsync; + u64 tx_packets; + u64 tx_bytes; + struct sk_buff_head tq;*/ + + int drop:1; +}; + +struct rb_root ipoe_rbt = RB_ROOT; +static atomic_t ipoe_rlock; +static atomic_t ipoe_update; +static DEFINE_SEMAPHORE(ipoe_wlock); + +struct sk_buff_head ipoe_rq; +struct tasklet_struct ipoe_rq_tasklet; + +static struct ipoe_session *ipoe_lookup(__be32 addr, struct rb_node **r_parent, struct rb_node ***r_p); +static int ipoe_do_nat(struct sk_buff *skb, __be32 new_addr, int to_peer); + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35) +static const struct net_device_ops ipoe_netdev_ops; +#endif + +static struct genl_family ipoe_nl_family; + +static void ipoe_recv_rq(unsigned long arg) +{ + struct sk_buff *skb; + int upd; + struct iphdr *iph; + int noff; + struct ipoe_session *ses; + + atomic_inc(&ipoe_rlock); + if (atomic_read(&ipoe_update) == UPDATE) { + atomic_dec(&ipoe_rlock); + tasklet_schedule(&ipoe_rq_tasklet); + return; + } + + while ((skb = skb_dequeue(&ipoe_rq))) { + noff = skb_network_offset(skb); + + iph = ip_hdr(skb); + + ses = ipoe_lookup(iph->saddr, NULL, NULL); + if (!ses) + goto drop; + + if (ses->drop) + goto drop; + + if (ses->addr && ipoe_do_nat(skb, ses->addr, 0)) + goto drop; + + skb->dev = ses->dev; + //skb->skb_iif = ses->link_dev->ifindex; + + netif_rx(skb); + + if (atomic_read(&ipoe_update) == NEED_UPDATE) + break; + + continue; + + drop: + kfree_skb(skb); + } + + upd = atomic_read(&ipoe_update); + if (atomic_dec_and_test(&ipoe_rlock) && upd == NEED_UPDATE) + atomic_set(&ipoe_update, UPDATE); +} + +static int ipoe_do_nat(struct sk_buff *skb, __be32 new_addr, int to_peer) +{ + struct iphdr *iph; + int noff; + int ihl; + __be32 addr; + + noff = skb_network_offset(skb); + + iph = ip_hdr(skb); + + if (to_peer) + addr = iph->daddr; + else + addr = iph->saddr; + + if (skb_cloned(skb) && + !skb_clone_writable(skb, sizeof(*iph) + noff) && + pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) + return -1; + + iph = ip_hdr(skb); + + if (to_peer) + iph->daddr = new_addr; + else + iph->saddr = new_addr; + + csum_replace4(&iph->check, addr, new_addr); + + ihl = iph->ihl * 4; + + switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { + case IPPROTO_TCP: + { + struct tcphdr *tcph; + + if (!pskb_may_pull(skb, ihl + sizeof(*tcph) + noff) || + (skb_cloned(skb) && + !skb_clone_writable(skb, ihl + sizeof(*tcph) + noff) && + pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) + return -1; + + tcph = (void *)(skb_network_header(skb) + ihl); + inet_proto_csum_replace4(&tcph->check, skb, addr, new_addr, 1); + break; + } + case IPPROTO_UDP: + { + struct udphdr *udph; + + if (!pskb_may_pull(skb, ihl + sizeof(*udph) + noff) || + (skb_cloned(skb) && + !skb_clone_writable(skb, ihl + sizeof(*udph) + noff) && + pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) + return -1; + + udph = (void *)(skb_network_header(skb) + ihl); + if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) { + inet_proto_csum_replace4(&udph->check, skb, addr, new_addr, 1); + if (!udph->check) + udph->check = CSUM_MANGLED_0; + } + break; + } + case IPPROTO_ICMP: + { + struct icmphdr *icmph; + + if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + noff)) + return -1; + + icmph = (void *)(skb_network_header(skb) + ihl); + + if ((icmph->type != ICMP_DEST_UNREACH) && + (icmph->type != ICMP_TIME_EXCEEDED) && + (icmph->type != ICMP_PARAMETERPROB)) + break; + + if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph) + + noff)) + return -1; + + icmph = (void *)(skb_network_header(skb) + ihl); + iph = (void *)(icmph + 1); + + if (skb_cloned(skb) && + !skb_clone_writable(skb, ihl + sizeof(*icmph) + + sizeof(*iph) + noff) && + pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) + return -1; + + icmph = (void *)(skb_network_header(skb) + ihl); + iph = (void *)(icmph + 1); + if (to_peer) + iph->saddr = new_addr; + else + iph->daddr = new_addr; + + inet_proto_csum_replace4(&icmph->checksum, skb, addr, new_addr, 0); + break; + } + default: + break; + } + + return 0; +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) +static int ipoe_xmit(struct sk_buff *skb, struct net_device *dev) +#else +static netdev_tx_t ipoe_xmit(struct sk_buff *skb, struct net_device *dev) +#endif +{ + struct ipoe_session *ses = netdev_priv(dev); + struct net_device_stats *stats = &dev->stats; + struct iphdr *iph; + int noff; + + noff = skb_network_offset(skb); + + if (!pskb_may_pull(skb, sizeof(*iph) + noff)) + goto drop; + + iph = ip_hdr(skb); + + pr_info("ipoe: xmit %08x %08x\n", iph->saddr, iph->daddr); + + /*u64_stats_update_begin(&ses->tsync); + ses->tx_packets++; + ses->tx_bytes += skb->len; + u64_stats_update_end(&ses->tsync);*/ + + if (iph->daddr == ses->addr && ipoe_do_nat(skb, ses->peer_addr, 1)) + goto drop; + + skb->dev = ses->link_dev; + skb->skb_iif = dev->ifindex; + dev_queue_xmit(skb); + + return NETDEV_TX_OK; +drop: + stats->tx_dropped++; + dev_kfree_skb(skb); + return NETDEV_TX_OK; +} + +static int ipoe_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) +{ + struct ipoe_session *ses = NULL; + struct iphdr *iph; + int upd; + int noff; + int r; + + if (skb->pkt_type == PACKET_OTHERHOST) + goto drop; + + noff = skb_network_offset(skb); + + if (!pskb_may_pull(skb, sizeof(*iph) + noff)) + goto drop; + + iph = ip_hdr(skb); + + //pr_info("ipoe: recv %08x %08x\n", iph->saddr, iph->daddr); + + atomic_inc(&ipoe_rlock); + upd = atomic_read(&ipoe_update); + if (upd == NEED_UPDATE) { + skb_queue_tail(&ipoe_rq, skb); + + if (atomic_dec_and_test(&ipoe_rlock)) + atomic_set(&ipoe_update, UPDATE); + + return NET_RX_SUCCESS; + } else if (upd == UPDATE) { + skb_queue_tail(&ipoe_rq, skb); + atomic_dec(&ipoe_rlock); + return NET_RX_SUCCESS; + } + + ses = ipoe_lookup(iph->saddr, NULL, NULL); + if (!ses) + goto drop_unlock; + + if (ses->drop) + goto drop_unlock; + + if (ses->addr && ipoe_do_nat(skb, ses->addr, 0)) + goto drop_unlock; + + skb->dev = ses->dev; + //skb->skb_iif = ses->link_dev->ifindex; + + r = netif_rx(skb); + + atomic_dec(&ipoe_rlock); + + return r; + + +drop_unlock: + atomic_dec(&ipoe_rlock); +drop: + kfree_skb(skb); + return NET_RX_DROP; +} + +static int ipoe_hard_header(struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *daddr, + const void *saddr, unsigned len) +{ + const struct ipoe_session *ses = netdev_priv(dev); + + return dev_hard_header(skb, ses->link_dev, type, ses->hwaddr, + dev->dev_addr, len); +} + +static void ipoe_netdev_setup(struct net_device *dev) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) + dev->hard_start_xmit = ipoe_xmit; +#else + dev->netdev_ops = &ipoe_netdev_ops; +#endif + dev->destructor = free_netdev; + + dev->type = ARPHRD_ETHER; + dev->hard_header_len = ETH_ALEN; + dev->mtu = ETH_DATA_LEN; + dev->flags = IFF_NOARP; + dev->iflink = 0; + dev->addr_len = 4; + dev->features = 0;//|= NETIF_F_NETNS_LOCAL; + dev->header_ops = &ipoe_hard_header_ops, +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35) + dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; +#endif +} + +static int ipoe_create(__be32 peer_addr, __be32 addr, const char *link_ifname, const __u8 *hwaddr) +{ + struct ipoe_session *ses; + struct net_device *dev, *link_dev; + char name[IFNAMSIZ]; + int r = 0; + struct rb_node **p; + struct rb_node *parent; + + link_dev = dev_get_by_name(&init_net, link_ifname); + if (!link_dev) + return -EINVAL; + + sprintf(name, "ipoe%%d"); + + dev = alloc_netdev(sizeof(*ses), name, ipoe_netdev_setup); + if (dev == NULL) + goto failed; + + dev_net_set(dev, &init_net); + + r = dev_alloc_name(dev, name); + if (r < 0) + goto failed_free; + + ses = netdev_priv(dev); + ses->dev = dev; + ses->addr = addr; + ses->peer_addr = peer_addr; + ses->link_dev = link_dev; + memcpy(ses->hwaddr, hwaddr, ETH_ALEN); + dev->features = link_dev->features; + + rtnl_lock(); + r = register_netdevice(dev); + rtnl_unlock(); + if (r < 0) + goto failed_free; + + down(&ipoe_wlock); + atomic_inc(&ipoe_rlock); + atomic_set(&ipoe_update, NEED_UPDATE); + if (atomic_dec_and_test(&ipoe_rlock)) + atomic_set(&ipoe_update, UPDATE); + else { + while (atomic_read(&ipoe_update) != UPDATE) + schedule_timeout_uninterruptible(1); + } + + if (ipoe_lookup(peer_addr, &parent, &p)) + r = -EEXIST; + else { + rb_link_node(&ses->node, parent, p); + rb_insert_color(&ses->node, &ipoe_rbt); + } + + up(&ipoe_wlock); + + atomic_set(&ipoe_update, 0); + + tasklet_schedule(&ipoe_rq_tasklet); + + return r; + +failed_free: + free_netdev(dev); +failed: + dev_put(link_dev); + return r; +} + +static struct ipoe_session *ipoe_lookup(__be32 addr, struct rb_node **r_parent, struct rb_node ***r_p) +{ + struct ipoe_session *ses; + struct rb_node **p = &ipoe_rbt.rb_node; + struct rb_node *parent = NULL; + + while (*p) { + parent = *p; + ses = rb_entry(parent, typeof(*ses), node); + if (addr < ses->peer_addr) + p = &(*p)->rb_left; + else if (addr > ses->peer_addr) + p = &(*p)->rb_right; + else + return ses; + } + + if (r_parent) { + *r_parent = parent; + *r_p = p; + } + + return NULL; +} + + + +static int ipoe_delete(__be32 addr) +{ + struct ipoe_session *ses; + + down(&ipoe_wlock); + + atomic_inc(&ipoe_rlock); + atomic_set(&ipoe_update, NEED_UPDATE); + if (atomic_dec_and_test(&ipoe_rlock)) + atomic_set(&ipoe_update, UPDATE); + else { + while (atomic_read(&ipoe_update) != UPDATE) + schedule_timeout_uninterruptible(1); + } + + ses = ipoe_lookup(addr, NULL, NULL); + if (ses) + rb_erase(&ses->node, &ipoe_rbt); + + up(&ipoe_wlock); + + atomic_set(&ipoe_update, 0); + + tasklet_schedule(&ipoe_rq_tasklet); + + if (!ses) + return -EINVAL; + + dev_put(ses->link_dev); + unregister_netdev(ses->dev); + + return 0; +} + +static int ipoe_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info) +{ + struct sk_buff *msg; + void *hdr; + int ret = -ENOBUFS; + + msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); + if (!msg) { + ret = -ENOMEM; + goto out; + } + + hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, + &ipoe_nl_family, 0, IPOE_CMD_NOOP); + if (IS_ERR(hdr)) { + ret = PTR_ERR(hdr); + goto err_out; + } + + genlmsg_end(msg, hdr); + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) + return genlmsg_unicast(msg, info->snd_pid); +#else + return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid); +#endif + +err_out: + nlmsg_free(msg); + +out: + return ret; +} + +static int ipoe_nl_cmd_create(struct sk_buff *skb, struct genl_info *info) +{ + struct ipoe_session *ses; + __be32 peer_addr, addr = 0; + int ret = 0; + char ifname[IFNAMSIZ]; + __u8 hwaddr[ETH_ALEN]; + //struct net *net = genl_info_net(info); + + if (!info->attrs[IPOE_ATTR_PEER_ADDR] || !info->attrs[IPOE_ATTR_IFNAME]) { + ret = -EINVAL; + goto out; + } + + peer_addr = nla_get_be32(info->attrs[IPOE_ATTR_PEER_ADDR]); + if (info->attrs[IPOE_ATTR_ADDR]) + addr = nla_get_be32(info->attrs[IPOE_ATTR_ADDR]); + nla_strlcpy(ifname, info->attrs[IPOE_ATTR_IFNAME], IFNAMSIZ - 1); + if (info->attrs[IPOE_ATTR_HWADDR]) + nla_strlcpy(hwaddr, info->attrs[IPOE_ATTR_HWADDR], ETH_ALEN); + else + memset(hwaddr, 0, sizeof(hwaddr)); + + pr_info("ipoe: create %08x %08x %s\n", peer_addr, addr, ifname); + + ret = ipoe_create(peer_addr, addr, ifname, hwaddr); + +out: + return ret; +} + +static int ipoe_nl_cmd_delete(struct sk_buff *skb, struct genl_info *info) +{ + __be32 addr; + //struct net *net = genl_info_net(info); + + + if (!info->attrs[IPOE_ATTR_PEER_ADDR]) + return -EINVAL; + + addr = nla_get_u32(info->attrs[IPOE_ATTR_PEER_ADDR]); + + pr_info("ipoe: delete %08x\n", addr); + + return ipoe_delete(addr); +} + +static struct nla_policy ipoe_nl_policy[IPOE_ATTR_MAX + 1] = { + [IPOE_ATTR_NONE] = { .type = NLA_UNSPEC, }, + [IPOE_ATTR_ADDR] = { .type = NLA_U32, }, + [IPOE_ATTR_PEER_ADDR] = { .type = NLA_U32, }, + [IPOE_ATTR_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, + [IPOE_ATTR_HWADDR] = { .type = NLA_BINARY, .len = ETH_ALEN }, +}; + +static struct genl_ops ipoe_nl_ops[] = { + { + .cmd = IPOE_CMD_NOOP, + .doit = ipoe_nl_cmd_noop, + .policy = ipoe_nl_policy, + /* can be retrieved by unprivileged users */ + }, + { + .cmd = IPOE_CMD_CREATE, + .doit = ipoe_nl_cmd_create, + .policy = ipoe_nl_policy, + .flags = GENL_ADMIN_PERM, + }, + { + .cmd = IPOE_CMD_DELETE, + .doit = ipoe_nl_cmd_delete, + .policy = ipoe_nl_policy, + .flags = GENL_ADMIN_PERM, + }, +}; + +static struct genl_family ipoe_nl_family = { + .id = GENL_ID_GENERATE, + .name = IPOE_GENL_NAME, + .version = IPOE_GENL_VERSION, + .hdrsize = 0, + .maxattr = IPOE_ATTR_MAX, +}; + +static const struct header_ops ipoe_hard_header_ops = { + .create = ipoe_hard_header, + .rebuild = eth_rebuild_header, + .parse = eth_header_parse, + .cache = eth_header_cache, + .cache_update = eth_header_cache_update, +}; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35) +static const struct net_device_ops ipoe_netdev_ops = { + .ndo_start_xmit = ipoe_xmit, +}; +#endif + +static struct packet_type ip_packet_type = { + .type = __constant_htons(ETH_P_IP), + .func = ipoe_rcv, +}; + +/*static struct pernet_operations ipoe_net_ops = { + .init = ipoe_init_net, + .exit = ipoe_exit_net, + .id = &ipoe_net_id, + .size = sizeof(struct ipoe_net), +};*/ + +static int __init ipoe_init(void) +{ + int i, err; + + printk("IPoE session driver v0.1\n"); + + /*err = register_pernet_device(&ipoe_net_ops); + if (err < 0) + return err;*/ + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) + err = genl_register_family(&ipoe_nl_family); + if (err < 0) { + printk(KERN_INFO "ipoe: can't register netlink interface\n"); + goto out; + } + + for (i = 0; i < ARRAY_SIZE(ipoe_nl_ops); i++) { + err = genl_register_ops(&ipoe_nl_family, &ipoe_nl_ops[i]); + if (err) + break; + } + + if (err < 0) { + printk(KERN_INFO "ipoe: can't register netlink interface\n"); + goto out_unreg; + } +#else + err = genl_register_family_with_ops(&ipoe_nl_family, ipoe_nl_ops, + ARRAY_SIZE(ipoe_nl_ops)); +#endif + if (err < 0) { + printk(KERN_INFO "ipoe: can't register netlink interface\n"); + goto out; + } + + tasklet_init(&ipoe_rq_tasklet, ipoe_recv_rq, 0); + + skb_queue_head_init(&ipoe_rq); + + dev_add_pack(&ip_packet_type); + + return 0; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) +out_unreg: +#endif + genl_unregister_family(&ipoe_nl_family); +out: + return err; +} + +static void __exit ipoe_fini(void) +{ + dev_remove_pack(&ip_packet_type); + genl_unregister_family(&ipoe_nl_family); +} + +module_init(ipoe_init); +module_exit(ipoe_fini); +MODULE_LICENSE("GPL"); diff --git a/drivers/ipoe/ipoe.h b/drivers/ipoe/ipoe.h new file mode 100644 index 00000000..635c9dab --- /dev/null +++ b/drivers/ipoe/ipoe.h @@ -0,0 +1,33 @@ +#ifndef __LINUX_ISG_H +#define __LINUX_ISG_H + +#include + +enum { + IPOE_CMD_NOOP, + IPOE_CMD_CREATE, + IPOE_CMD_DELETE, + __IPOE_CMD_MAX, +}; + +#define IPOE_CMD_MAX (__IPOE_CMD_MAX - 1) + +enum { + IPOE_ATTR_NONE, /* no data */ + IPOE_ATTR_ADDR, /* u32 */ + IPOE_ATTR_PEER_ADDR, /* u32 */ + IPOE_ATTR_IFNAME, /* u32 */ + IPOE_ATTR_HWADDR, /* u32 */ + __IPOE_ATTR_MAX, +}; + +#define IPOE_ATTR_MAX (__IPOE_ATTR_MAX - 1) + +/* + * NETLINK_GENERIC related info + */ +#define IPOE_GENL_NAME "IPoE" +#define IPOE_GENL_VERSION 0x1 + +#endif + diff --git a/drivers/pptp/CMakeLists.txt b/drivers/pptp/CMakeLists.txt new file mode 100644 index 00000000..fd732e6a --- /dev/null +++ b/drivers/pptp/CMakeLists.txt @@ -0,0 +1,19 @@ +if (NOT DEFINED KDIR) + set(KDIR "/usr/src/linux") +endif (NOT DEFINED KDIR) + +ADD_CUSTOM_COMMAND(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/driver/pptp.ko + COMMAND rm -rf ${CMAKE_CURRENT_BINARY_DIR}/driver + COMMAND mkdir ${CMAKE_CURRENT_BINARY_DIR}/driver + COMMAND ln -sf ${CMAKE_CURRENT_SOURCE_DIR}/* ${CMAKE_CURRENT_BINARY_DIR}/driver + COMMAND make -C ${KDIR} M=${CMAKE_CURRENT_BINARY_DIR}/driver modules + DEPENDS pptp.c +) + +ADD_CUSTOM_TARGET(pptp_drv ALL + DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/driver/pptp.ko +) + +IF (NOT DEFINED CPACK_TYPE) + INSTALL(CODE "EXECUTE_PROCESS(COMMAND make -C ${KDIR} M=${CMAKE_CURRENT_BINARY_DIR}/driver modules_install)") +ENDIF (NOT DEFINED CPACK_TYPE) diff --git a/drivers/pptp/Makefile b/drivers/pptp/Makefile new file mode 100644 index 00000000..8ccbbedf --- /dev/null +++ b/drivers/pptp/Makefile @@ -0,0 +1,4 @@ +obj-m += pptp.o + +default: + make -C $(KDIR) M=$(PWD) modules diff --git a/drivers/pptp/gre.c b/drivers/pptp/gre.c new file mode 100644 index 00000000..77886d5d --- /dev/null +++ b/drivers/pptp/gre.c @@ -0,0 +1,220 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "gre.h" + +struct gre_protocol *gre_proto[GREPROTO_MAX] ____cacheline_aligned_in_smp; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) +static rwlock_t gre_proto_lock=RW_LOCK_UNLOCKED; +#else +static DEFINE_SPINLOCK(gre_proto_lock); +#endif + +int gre_add_protocol(struct gre_protocol *proto, u8 version) +{ + int ret; + + if (version >= GREPROTO_MAX) + return -EINVAL; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + write_lock_bh(&gre_proto_lock); +#else + spin_lock(&gre_proto_lock); +#endif + if (gre_proto[version]) { + ret = -EAGAIN; + } else { +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + gre_proto[version] = proto; +#else + rcu_assign_pointer(gre_proto[version], proto); +#endif + ret = 0; + } +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + write_unlock_bh(&gre_proto_lock); +#else + spin_unlock(&gre_proto_lock); +#endif + + return ret; +} + +int gre_del_protocol(struct gre_protocol *proto, u8 version) +{ + if (version >= GREPROTO_MAX) + goto out_err; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + write_lock_bh(&gre_proto_lock); +#else + spin_lock(&gre_proto_lock); +#endif + if (gre_proto[version] == proto) +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + gre_proto[version] = NULL; +#else + rcu_assign_pointer(gre_proto[version], NULL); +#endif + else + goto out_err_unlock; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + write_unlock_bh(&gre_proto_lock); +#else + spin_unlock(&gre_proto_lock); + synchronize_rcu(); +#endif + return 0; + +out_err_unlock: +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + write_unlock_bh(&gre_proto_lock); +#else + spin_unlock(&gre_proto_lock); +#endif +out_err: + return -EINVAL; +} + +static int gre_rcv(struct sk_buff *skb) +{ + u8 ver; + int ret; + struct gre_protocol *proto; + + if (!pskb_may_pull(skb, 12)) + goto drop_nolock; + + ver = skb->data[1]&0x7f; + if (ver >= GREPROTO_MAX) + goto drop_nolock; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + read_lock(&gre_proto_lock); + proto = gre_proto[ver]; +#else + rcu_read_lock(); + proto = rcu_dereference(gre_proto[ver]); +#endif + if (!proto || !proto->handler) + goto drop; + + ret = proto->handler(skb); + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + read_unlock(&gre_proto_lock); +#else + rcu_read_unlock(); +#endif + + return ret; + +drop: +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + read_unlock(&gre_proto_lock); +#else + rcu_read_unlock(); +#endif +drop_nolock: + kfree_skb(skb); + return NET_RX_DROP; +} + +static void gre_err(struct sk_buff *skb, u32 info) +{ + u8 ver; + struct gre_protocol *proto; + + if (!pskb_may_pull(skb, 12)) + goto drop_nolock; + + ver=skb->data[1]&0x7f; + if (ver>=GREPROTO_MAX) + goto drop_nolock; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + read_lock(&gre_proto_lock); + proto = gre_proto[ver]; +#else + rcu_read_lock(); + proto = rcu_dereference(gre_proto[ver]); +#endif + if (!proto || !proto->err_handler) + goto drop; + + proto->err_handler(skb, info); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + read_unlock(&gre_proto_lock); +#else + rcu_read_unlock(); +#endif + + return; + +drop: +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + read_unlock(&gre_proto_lock); +#else + rcu_read_unlock(); +#endif +drop_nolock: + kfree_skb(skb); +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) +static struct inet_protocol net_gre_protocol = { + .handler = gre_rcv, + .err_handler = gre_err, + .protocol = IPPROTO_GRE, + .name = "GRE", +}; +#else +static struct net_protocol net_gre_protocol = { + .handler = gre_rcv, + .err_handler = gre_err, +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,24) + .netns_ok=1, +#endif +}; +#endif + +static int __init gre_init(void) +{ + printk(KERN_INFO "GRE over IPv4 demultiplexor driver"); + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + inet_add_protocol(&net_gre_protocol); +#else + if (inet_add_protocol(&net_gre_protocol, IPPROTO_GRE) < 0) { + printk(KERN_INFO "gre: can't add protocol\n"); + return -EAGAIN; + } +#endif + return 0; +} + +static void __exit gre_exit(void) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + inet_del_protocol(&net_gre_protocol); +#else + inet_del_protocol(&net_gre_protocol, IPPROTO_GRE); +#endif +} + +module_init(gre_init); +module_exit(gre_exit); + +MODULE_DESCRIPTION("GRE over IPv4 demultiplexor driver"); +MODULE_AUTHOR("Kozlov D. (xeb@mail.ru)"); +MODULE_LICENSE("GPL"); +EXPORT_SYMBOL_GPL(gre_add_protocol); +EXPORT_SYMBOL_GPL(gre_del_protocol); diff --git a/drivers/pptp/gre.h b/drivers/pptp/gre.h new file mode 100644 index 00000000..2ca7f749 --- /dev/null +++ b/drivers/pptp/gre.h @@ -0,0 +1,18 @@ +#ifndef __LINUX_GRE_H +#define __LINUX_GRE_H + +#include + +#define GREPROTO_CISCO 0 +#define GREPROTO_PPTP 1 +#define GREPROTO_MAX 2 + +struct gre_protocol { + int (*handler)(struct sk_buff *skb); + void (*err_handler)(struct sk_buff *skb, u32 info); +}; + +int gre_add_protocol(struct gre_protocol *proto, u8 version); +int gre_del_protocol(struct gre_protocol *proto, u8 version); + +#endif diff --git a/drivers/pptp/if_pppox.h b/drivers/pptp/if_pppox.h new file mode 100644 index 00000000..bc05b533 --- /dev/null +++ b/drivers/pptp/if_pppox.h @@ -0,0 +1,222 @@ +/*************************************************************************** + * Linux PPP over X - Generic PPP transport layer sockets + * Linux PPP over Ethernet (PPPoE) Socket Implementation (RFC 2516) + * + * This file supplies definitions required by the PPP over Ethernet driver + * (pppox.c). All version information wrt this file is located in pppox.c + * + * License: + * 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. + * + */ + +#ifndef __LINUX_IF_PPPOX_H +#define __LINUX_IF_PPPOX_H + + +#include +#include +#include + +#ifdef __KERNEL__ +#include +#include +#include +#include +#include +#endif /* __KERNEL__ */ + +/* For user-space programs to pick up these definitions + * which they wouldn't get otherwise without defining __KERNEL__ + */ +#ifndef AF_PPPOX +#define AF_PPPOX 24 +#define PF_PPPOX AF_PPPOX +#endif /* !(AF_PPPOX) */ + +/************************************************************************ + * PPPoE addressing definition + */ +typedef __u16 sid_t; +struct pppoe_addr{ + sid_t sid; /* Session identifier */ + unsigned char remote[ETH_ALEN]; /* Remote address */ + char dev[IFNAMSIZ]; /* Local device to use */ +}; + +struct pptp_addr{ + __u16 call_id; + struct in_addr sin_addr; +}; +/************************************************************************ + * Protocols supported by AF_PPPOX + */ +#define PX_PROTO_OE 0 /* Currently just PPPoE */ +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,22) +#define PX_PROTO_PPTP 1 +#define PX_MAX_PROTO 2 +#else +#define PX_PROTO_PPTP 2 +#define PX_MAX_PROTO 3 +#endif + +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)); + + +/********************************************************************* + * + * ioctl interface for defining forwarding of connections + * + ********************************************************************/ + +#define PPPOEIOCSFWD _IOW(0xB1 ,0, size_t) +#define PPPOEIOCDFWD _IO(0xB1 ,1) +/*#define PPPOEIOCGFWD _IOWR(0xB1,2, size_t)*/ + +/* Codes to identify message types */ +#define PADI_CODE 0x09 +#define PADO_CODE 0x07 +#define PADR_CODE 0x19 +#define PADS_CODE 0x65 +#define PADT_CODE 0xa7 +struct pppoe_tag { + __u16 tag_type; + __u16 tag_len; + char tag_data[0]; +} __attribute ((packed)); + +/* Tag identifiers */ +#define PTT_EOL __constant_htons(0x0000) +#define PTT_SRV_NAME __constant_htons(0x0101) +#define PTT_AC_NAME __constant_htons(0x0102) +#define PTT_HOST_UNIQ __constant_htons(0x0103) +#define PTT_AC_COOKIE __constant_htons(0x0104) +#define PTT_VENDOR __constant_htons(0x0105) +#define PTT_RELAY_SID __constant_htons(0x0110) +#define PTT_SRV_ERR __constant_htons(0x0201) +#define PTT_SYS_ERR __constant_htons(0x0202) +#define PTT_GEN_ERR __constant_htons(0x0203) + +struct pppoe_hdr { +#if defined(__LITTLE_ENDIAN_BITFIELD) + __u8 ver : 4; + __u8 type : 4; +#elif defined(__BIG_ENDIAN_BITFIELD) + __u8 type : 4; + __u8 ver : 4; +#else +#error "Please fix " +#endif + __u8 code; + __u16 sid; + __u16 length; + struct pppoe_tag tag[0]; +} __attribute__ ((packed)); + + +/* Socket options */ +#define PPTP_SO_TIMEOUT 1 + + +#ifdef __KERNEL__ +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) +struct pppoe_opt { + struct net_device *dev; /* device associated with socket*/ + struct pppoe_addr pa; /* what this socket is bound to*/ + struct sockaddr_pppox relay; /* what socket data will be + relayed to (PPPoE relaying) */ +}; +#endif +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; +}; +#define PPTP_FLAG_PAUSE 0 +#define PPTP_FLAG_PROC 1 + +#include + +struct pppox_sock { + /* struct sock must be the first member of pppox_sock */ + #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + struct ppp_channel chan; + struct sock *sk; + #else + struct sock sk; + struct ppp_channel chan; + #endif + struct pppox_sock *next; /* for hash table */ + union { + struct pppoe_opt pppoe; + struct pptp_opt pptp; + } proto; + unsigned short num; +}; +#define pppoe_dev proto.pppoe.dev +#define pppoe_pa proto.pppoe.pa +#define pppoe_relay proto.pppoe.relay + +static inline struct pppox_sock *pppox_sk(struct sock *sk) +{ + #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + return (struct pppox_sock *)sk->protinfo.pppox; + #else + return (struct pppox_sock *)sk; + #endif +} + +static inline struct sock *sk_pppox(struct pppox_sock *po) +{ + #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + return po->sk; + #else + return (struct sock *)po; + #endif +} + +struct module; + +struct pppox_proto { + #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24) + int (*create)(struct socket *sock); + #else + int (*create)(struct net *net, struct socket *sock); + #endif + int (*ioctl)(struct socket *sock, unsigned int cmd, + unsigned long arg); + #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15) + struct module *owner; + #endif +}; + +extern int register_pppox_proto(int proto_num, struct pppox_proto *pp); +extern void unregister_pppox_proto(int proto_num); +extern void pppox_unbind_sock(struct sock *sk);/* delete ppp-channel binding */ +extern int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); + +/* PPPoX socket states */ +enum { + PPPOX_NONE = 0, /* initial state */ + PPPOX_CONNECTED = 1, /* connection established ==TCP_ESTABLISHED */ + PPPOX_BOUND = 2, /* bound to ppp device */ + PPPOX_RELAY = 4, /* forwarding is enabled */ + PPPOX_ZOMBIE = 8, /* dead, but still bound to ppp device */ + PPPOX_DEAD = 16 /* dead, useless, please clean me up!*/ +}; + +#endif /* __KERNEL__ */ + +#endif /* !(__LINUX_IF_PPPOX_H) */ diff --git a/drivers/pptp/pptp.c b/drivers/pptp/pptp.c new file mode 100644 index 00000000..78853fcb --- /dev/null +++ b/drivers/pptp/pptp.c @@ -0,0 +1,1272 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "if_pppox.h" +#include +#include +#include +#include +#include +#include +#include +#include + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) +#include +#endif + +#include +#include +#include +#include +#include + +#include + +#define DEBUG +//#define CONFIG_GRE + +#if defined(CONFIG_GRE) || defined(CONFIG_GRE_MODULE) +#include "gre.h" +#endif + +#define PPTP_DRIVER_VERSION "0.8.5" + +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)){ +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) + sock = rcu_dereference(callid_sock[i]); +#else + sock = callid_sock[i]; +#endif + 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; + } +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0) + rcu_read_unlock(); +#else + up(&chan_lock); +#endif + + return i 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; + +#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 + set_bit(sock->proto.pptp.src_addr.call_id,callid_bitmap); + 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 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + tdev = rt->u.dst.dev; +#else + tdev = rt->dst.dev; +#endif + +#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 LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + if (ip_dont_fragment(sk, &rt->u.dst)) +#else + if (ip_dont_fragment(sk, &rt->dst)) +#endif + 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 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT); +#else + iph->ttl = dst_metric(&rt->dst, RTAX_HOPLIMIT); +#endif +#endif + iph->tot_len = htons(skb->len); + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31) + skb_dst_drop(skb); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + skb_dst_set(skb,&rt->u.dst); +#else + skb_dst_set(skb,&rt->dst); +#endif +#else + dst_release(skb->dst); + skb->dst = &rt->u.dst; +#endif + + nf_reset(skb); + + skb->ip_summed = CHECKSUM_NONE; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + ip_select_ident(iph, &rt->u.dst, NULL); +#else + ip_select_ident(iph, &rt->dst, NULL); +#endif + 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; + } +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + sk_setup_caps(sk, &rt->u.dst); +#else + sk_setup_caps(sk, &rt->dst); +#endif + } +#endif +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + po->chan.mtu=PPP_MTU; +#else +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + po->chan.mtu=dst_mtu(&rt->u.dst); +#else + po->chan.mtu=dst_mtu(&rt->dst); +#endif + 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)"); + diff --git a/ipoe-util/CMakeLists.txt b/ipoe-util/CMakeLists.txt new file mode 100644 index 00000000..4f2ad01a --- /dev/null +++ b/ipoe-util/CMakeLists.txt @@ -0,0 +1,20 @@ +INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}) +INCLUDE_DIRECTORIES(${CMAKE_HOME_DIRECTORY}/ipses) + +if (LIBNL2) + ADD_DEFINITIONS("-DLIBNL2") +endif (LIBNL2) + +ADD_EXECUTABLE(ipses-create ipses-create.c) + +ADD_EXECUTABLE(ipses-delete ipses-delete.c) + +if (LIBNL2) + TARGET_LINK_LIBRARIES(ipses-create nl nl-genl m) + TARGET_LINK_LIBRARIES(ipses-delete nl nl-genl m) +else (LIBNL2) + TARGET_LINK_LIBRARIES(ipses-create nl) + TARGET_LINK_LIBRARIES(ipses-delete nl) +endif (LIBNL2) + + diff --git a/ipoe-util/ipoe.h b/ipoe-util/ipoe.h new file mode 120000 index 00000000..7117b41c --- /dev/null +++ b/ipoe-util/ipoe.h @@ -0,0 +1 @@ +../drivers/ipoe/ipoe.h \ No newline at end of file diff --git a/ipoe-util/ipses-create.c b/ipoe-util/ipses-create.c new file mode 100644 index 00000000..5aaf1ab7 --- /dev/null +++ b/ipoe-util/ipses-create.c @@ -0,0 +1,61 @@ +#include +#include +#include +#include +#include + +#include +#include +#include + + +#include "ipoe.h" + +int main(int argc, char **argv) +{ +#if LIBNL2 + struct nl_sock *h; +#else + struct nl_handle *h; +#endif + struct nl_msg *msg; + int family; + in_addr_t local, remote; + int err; + + if (argc != 4) { + printf("usage: ipses-create \n"); + return 1; + } + + local = inet_addr(argv[2]); + remote = inet_addr(argv[3]); + +#if LIBNL2 + h = nl_socket_alloc(); +#else + h = nl_handle_alloc(); +#endif + genl_connect(h); + family = genl_ctrl_resolve(h, IPOE_GENL_NAME); + + msg = nlmsg_alloc(); + genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, family, 0, NLM_F_REQUEST, IPOE_CMD_CREATE, IPOE_GENL_VERSION); + nla_put_u32(msg, IPOE_ATTR_PEER_ADDR, local); + nla_put_u32(msg, IPOE_ATTR_ADDR, remote); + nla_put_string(msg, IPOE_ATTR_IFNAME, argv[1]); + + nl_send_auto_complete(h, msg); + err = nl_recvmsgs_default(h); +#if LIBNL2 + printf("recv: %s\n", nl_geterror(err)); +#else + nl_perror("recv"); +#endif + + nlmsg_free(msg); + nl_close(h); + + return 0; +} + diff --git a/ipoe-util/ipses-delete.c b/ipoe-util/ipses-delete.c new file mode 100644 index 00000000..4e6a1843 --- /dev/null +++ b/ipoe-util/ipses-delete.c @@ -0,0 +1,58 @@ +#include +#include +#include +#include +#include + +#include +#include +#include + + +#include "ipoe.h" + +int main(int argc, char **argv) +{ +#if LIBNL2 + struct nl_sock *h; +#else + struct nl_handle *h; +#endif + struct nl_msg *msg; + int family; + in_addr_t local; + int err; + + if (argc != 2) { + printf("usage: ipses-delete \n"); + return 1; + } + + local = inet_addr(argv[1]); + +#if LIBNL2 + h = nl_socket_alloc(); +#else + h = nl_handle_alloc(); +#endif + genl_connect(h); + family = genl_ctrl_resolve(h, IPOE_GENL_NAME); + + msg = nlmsg_alloc(); + genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, family, 0, NLM_F_REQUEST, IPOE_CMD_DELETE, IPOE_GENL_VERSION); + nla_put_u32(msg, IPOE_ATTR_PEER_ADDR, local); + + nl_send_auto_complete(h, msg); + err = nl_recvmsgs_default(h); +#if LIBNL2 + printf("recv: %s\n", nl_geterror(err)); +#else + nl_perror("recv"); +#endif + + nlmsg_free(msg); + nl_close(h); + + return 0; +} + -- cgit v1.2.3