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This new ioctl pair allows two ppp channels to be bridged together: frames arriving in one channel are transmitted in the other channel and vice versa. The practical use for this is primarily to support the L2TP Access Concentrator use-case. The end-user session is presented as a ppp channel (typically PPPoE, although it could be e.g. PPPoA, or even PPP over a serial link) and is switched into a PPPoL2TP session for transmission to the LNS. At the LNS the PPP session is terminated in the ISP's network. When a PPP channel is bridged to another it takes a reference on the other's struct ppp_file. This reference is dropped when the channels are unbridged, which can occur either explicitly on userspace calling the PPPIOCUNBRIDGECHAN ioctl, or implicitly when either channel in the bridge is unregistered. In order to implement the channel bridge, struct channel is extended with a new field, 'bridge', which points to the other struct channel making up the bridge. This pointer is RCU protected to avoid adding another lock to the data path. To guard against concurrent writes to the pointer, the existing struct channel lock 'upl' coverage is extended rather than adding a new lock. The 'upl' lock is used to protect the existing unit pointer. Since the bridge effectively replaces the unit (they're mutually exclusive for a channel) it makes coding easier to use the same lock to cover them both. Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
126 lines
5.6 KiB
C
126 lines
5.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* ppp-ioctl.h - PPP ioctl definitions.
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*
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* Copyright 1999-2002 Paul Mackerras.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#ifndef _PPP_IOCTL_H
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#define _PPP_IOCTL_H
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <linux/ppp_defs.h>
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/*
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* Bit definitions for flags argument to PPPIOCGFLAGS/PPPIOCSFLAGS.
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*/
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#define SC_COMP_PROT 0x00000001 /* protocol compression (output) */
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#define SC_COMP_AC 0x00000002 /* header compression (output) */
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#define SC_COMP_TCP 0x00000004 /* TCP (VJ) compression (output) */
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#define SC_NO_TCP_CCID 0x00000008 /* disable VJ connection-id comp. */
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#define SC_REJ_COMP_AC 0x00000010 /* reject adrs/ctrl comp. on input */
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#define SC_REJ_COMP_TCP 0x00000020 /* reject TCP (VJ) comp. on input */
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#define SC_CCP_OPEN 0x00000040 /* Look at CCP packets */
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#define SC_CCP_UP 0x00000080 /* May send/recv compressed packets */
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#define SC_ENABLE_IP 0x00000100 /* IP packets may be exchanged */
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#define SC_LOOP_TRAFFIC 0x00000200 /* send traffic to pppd */
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#define SC_MULTILINK 0x00000400 /* do multilink encapsulation */
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#define SC_MP_SHORTSEQ 0x00000800 /* use short MP sequence numbers */
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#define SC_COMP_RUN 0x00001000 /* compressor has been inited */
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#define SC_DECOMP_RUN 0x00002000 /* decompressor has been inited */
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#define SC_MP_XSHORTSEQ 0x00004000 /* transmit short MP seq numbers */
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#define SC_DEBUG 0x00010000 /* enable debug messages */
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#define SC_LOG_INPKT 0x00020000 /* log contents of good pkts recvd */
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#define SC_LOG_OUTPKT 0x00040000 /* log contents of pkts sent */
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#define SC_LOG_RAWIN 0x00080000 /* log all chars received */
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#define SC_LOG_FLUSH 0x00100000 /* log all chars flushed */
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#define SC_SYNC 0x00200000 /* synchronous serial mode */
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#define SC_MUST_COMP 0x00400000 /* no uncompressed packets may be sent or received */
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#define SC_MASK 0x0f600fff /* bits that user can change */
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/* state bits */
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#define SC_XMIT_BUSY 0x10000000 /* (used by isdn_ppp?) */
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#define SC_RCV_ODDP 0x08000000 /* have rcvd char with odd parity */
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#define SC_RCV_EVNP 0x04000000 /* have rcvd char with even parity */
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#define SC_RCV_B7_1 0x02000000 /* have rcvd char with bit 7 = 1 */
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#define SC_RCV_B7_0 0x01000000 /* have rcvd char with bit 7 = 0 */
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#define SC_DC_FERROR 0x00800000 /* fatal decomp error detected */
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#define SC_DC_ERROR 0x00400000 /* non-fatal decomp error detected */
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/* Used with PPPIOCGNPMODE/PPPIOCSNPMODE */
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struct npioctl {
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int protocol; /* PPP protocol, e.g. PPP_IP */
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enum NPmode mode;
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};
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/* Structure describing a CCP configuration option, for PPPIOCSCOMPRESS */
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struct ppp_option_data {
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__u8 __user *ptr;
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__u32 length;
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int transmit;
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};
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/* For PPPIOCGL2TPSTATS */
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struct pppol2tp_ioc_stats {
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__u16 tunnel_id; /* redundant */
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__u16 session_id; /* if zero, get tunnel stats */
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__u32 using_ipsec:1;
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__aligned_u64 tx_packets;
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__aligned_u64 tx_bytes;
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__aligned_u64 tx_errors;
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__aligned_u64 rx_packets;
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__aligned_u64 rx_bytes;
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__aligned_u64 rx_seq_discards;
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__aligned_u64 rx_oos_packets;
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__aligned_u64 rx_errors;
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};
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/*
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* Ioctl definitions.
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*/
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#define PPPIOCGFLAGS _IOR('t', 90, int) /* get configuration flags */
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#define PPPIOCSFLAGS _IOW('t', 89, int) /* set configuration flags */
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#define PPPIOCGASYNCMAP _IOR('t', 88, int) /* get async map */
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#define PPPIOCSASYNCMAP _IOW('t', 87, int) /* set async map */
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#define PPPIOCGUNIT _IOR('t', 86, int) /* get ppp unit number */
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#define PPPIOCGRASYNCMAP _IOR('t', 85, int) /* get receive async map */
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#define PPPIOCSRASYNCMAP _IOW('t', 84, int) /* set receive async map */
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#define PPPIOCGMRU _IOR('t', 83, int) /* get max receive unit */
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#define PPPIOCSMRU _IOW('t', 82, int) /* set max receive unit */
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#define PPPIOCSMAXCID _IOW('t', 81, int) /* set VJ max slot ID */
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#define PPPIOCGXASYNCMAP _IOR('t', 80, ext_accm) /* get extended ACCM */
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#define PPPIOCSXASYNCMAP _IOW('t', 79, ext_accm) /* set extended ACCM */
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#define PPPIOCXFERUNIT _IO('t', 78) /* transfer PPP unit */
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#define PPPIOCSCOMPRESS _IOW('t', 77, struct ppp_option_data)
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#define PPPIOCGNPMODE _IOWR('t', 76, struct npioctl) /* get NP mode */
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#define PPPIOCSNPMODE _IOW('t', 75, struct npioctl) /* set NP mode */
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#define PPPIOCSPASS _IOW('t', 71, struct sock_fprog) /* set pass filter */
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#define PPPIOCSACTIVE _IOW('t', 70, struct sock_fprog) /* set active filt */
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#define PPPIOCGDEBUG _IOR('t', 65, int) /* Read debug level */
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#define PPPIOCSDEBUG _IOW('t', 64, int) /* Set debug level */
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#define PPPIOCGIDLE _IOR('t', 63, struct ppp_idle) /* get idle time */
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#define PPPIOCGIDLE32 _IOR('t', 63, struct ppp_idle32) /* 32-bit times */
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#define PPPIOCGIDLE64 _IOR('t', 63, struct ppp_idle64) /* 64-bit times */
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#define PPPIOCNEWUNIT _IOWR('t', 62, int) /* create new ppp unit */
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#define PPPIOCATTACH _IOW('t', 61, int) /* attach to ppp unit */
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#define PPPIOCDETACH _IOW('t', 60, int) /* obsolete, do not use */
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#define PPPIOCSMRRU _IOW('t', 59, int) /* set multilink MRU */
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#define PPPIOCCONNECT _IOW('t', 58, int) /* connect channel to unit */
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#define PPPIOCDISCONN _IO('t', 57) /* disconnect channel */
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#define PPPIOCATTCHAN _IOW('t', 56, int) /* attach to ppp channel */
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#define PPPIOCGCHAN _IOR('t', 55, int) /* get ppp channel number */
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#define PPPIOCGL2TPSTATS _IOR('t', 54, struct pppol2tp_ioc_stats)
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#define PPPIOCBRIDGECHAN _IOW('t', 53, int) /* bridge one channel to another */
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#define PPPIOCUNBRIDGECHAN _IO('t', 54) /* unbridge channel */
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#define SIOCGPPPSTATS (SIOCDEVPRIVATE + 0)
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#define SIOCGPPPVER (SIOCDEVPRIVATE + 1) /* NEVER change this!! */
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#define SIOCGPPPCSTATS (SIOCDEVPRIVATE + 2)
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#endif /* _PPP_IOCTL_H */
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