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if_spppsubr.c
5404 lines (4964 loc) · 133 KB
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if_spppsubr.c
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/*
* Synchronous PPP/Cisco link level subroutines.
* Keepalive protocol implemented in both Cisco and PPP modes.
*
* Copyright (C) 1994-1996 Cronyx Engineering Ltd.
* Author: Serge Vakulenko, <vak@cronyx.ru>
*
* Heavily revamped to conform to RFC 1661.
* Copyright (C) 1997, 2001 Joerg Wunsch.
*
* This software is distributed with NO WARRANTIES, not even the implied
* warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Authors grant any other persons or organisations permission to use
* or modify this software as long as this message is kept with the software,
* all derivative works or modified versions.
*
* From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997
*
* $FreeBSD$
*/
#include <sys/param.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipx.h"
#endif
#ifdef NetBSD1_3
# if NetBSD1_3 > 6
# include "opt_inet.h"
# include "opt_inet6.h"
# include "opt_iso.h"
# endif
#endif
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sockio.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <sys/random.h>
#endif
#include <sys/malloc.h>
#include <sys/mbuf.h>
#if defined (__OpenBSD__)
#include <sys/md5k.h>
#else
#include <sys/md5.h>
#endif
#include <net/if.h>
#include <net/netisr.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <net/slcompress.h>
#if defined (__NetBSD__) || defined (__OpenBSD__)
#include <machine/cpu.h> /* XXX for softnet */
#endif
#include <machine/stdarg.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#ifdef INET
#include <netinet/ip.h>
#include <netinet/tcp.h>
#endif
#if defined (__FreeBSD__) || defined (__OpenBSD__)
# include <netinet/if_ether.h>
#else
# include <net/ethertypes.h>
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#include <net/if_sppp.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
# define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg, handle)
# define TIMEOUT(fun, arg1, arg2, handle) handle = timeout(fun, arg1, arg2)
# define IOCTL_CMD_T u_long
#else
# define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg)
# define TIMEOUT(fun, arg1, arg2, handle) timeout(fun, arg1, arg2)
# define IOCTL_CMD_T int
#endif
#define MAXALIVECNT 3 /* max. alive packets */
/*
* Interface flags that can be set in an ifconfig command.
*
* Setting link0 will make the link passive, i.e. it will be marked
* as being administrative openable, but won't be opened to begin
* with. Incoming calls will be answered, or subsequent calls with
* -link1 will cause the administrative open of the LCP layer.
*
* Setting link1 will cause the link to auto-dial only as packets
* arrive to be sent.
*
* Setting IFF_DEBUG will syslog the option negotiation and state
* transitions at level kern.debug. Note: all logs consistently look
* like
*
* <if-name><unit>: <proto-name> <additional info...>
*
* with <if-name><unit> being something like "bppp0", and <proto-name>
* being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
*/
#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
#define IFF_AUTO IFF_LINK1 /* auto-dial on output */
#define IFF_CISCO IFF_LINK2 /* auto-dial on output */
#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
#define PPP_UI 0x03 /* Unnumbered Information */
#define PPP_IP 0x0021 /* Internet Protocol */
#define PPP_ISO 0x0023 /* ISO OSI Protocol */
#define PPP_XNS 0x0025 /* Xerox NS Protocol */
#define PPP_IPX 0x002b /* Novell IPX Protocol */
#define PPP_VJ_COMP 0x002d /* VJ compressed TCP/IP */
#define PPP_VJ_UCOMP 0x002f /* VJ uncompressed TCP/IP */
#define PPP_IPV6 0x0057 /* Internet Protocol Version 6 */
#define PPP_LCP 0xc021 /* Link Control Protocol */
#define PPP_PAP 0xc023 /* Password Authentication Protocol */
#define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */
#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
#define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */
#define CONF_REQ 1 /* PPP configure request */
#define CONF_ACK 2 /* PPP configure acknowledge */
#define CONF_NAK 3 /* PPP configure negative ack */
#define CONF_REJ 4 /* PPP configure reject */
#define TERM_REQ 5 /* PPP terminate request */
#define TERM_ACK 6 /* PPP terminate acknowledge */
#define CODE_REJ 7 /* PPP code reject */
#define PROTO_REJ 8 /* PPP protocol reject */
#define ECHO_REQ 9 /* PPP echo request */
#define ECHO_REPLY 10 /* PPP echo reply */
#define DISC_REQ 11 /* PPP discard request */
#define LCP_OPT_MRU 1 /* maximum receive unit */
#define LCP_OPT_ASYNC_MAP 2 /* async control character map */
#define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
#define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
#define LCP_OPT_MAGIC 5 /* magic number */
#define LCP_OPT_RESERVED 6 /* reserved */
#define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
#define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
#define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */
#define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */
#define IPCP_OPT_ADDRESS 3 /* local IP address */
#define IPV6CP_OPT_IFID 1 /* interface identifier */
#define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */
#define IPCP_COMP_VJ 0x2d /* Code for VJ compression */
#define PAP_REQ 1 /* PAP name/password request */
#define PAP_ACK 2 /* PAP acknowledge */
#define PAP_NAK 3 /* PAP fail */
#define CHAP_CHALLENGE 1 /* CHAP challenge request */
#define CHAP_RESPONSE 2 /* CHAP challenge response */
#define CHAP_SUCCESS 3 /* CHAP response ok */
#define CHAP_FAILURE 4 /* CHAP response failed */
#define CHAP_MD5 5 /* hash algorithm - MD5 */
#define CISCO_MULTICAST 0x8f /* Cisco multicast address */
#define CISCO_UNICAST 0x0f /* Cisco unicast address */
#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
#define CISCO_ADDR_REQ 0 /* Cisco address request */
#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
/* states are named and numbered according to RFC 1661 */
#define STATE_INITIAL 0
#define STATE_STARTING 1
#define STATE_CLOSED 2
#define STATE_STOPPED 3
#define STATE_CLOSING 4
#define STATE_STOPPING 5
#define STATE_REQ_SENT 6
#define STATE_ACK_RCVD 7
#define STATE_ACK_SENT 8
#define STATE_OPENED 9
struct ppp_header {
u_char address;
u_char control;
u_short protocol;
} __attribute__((__packed__));
#define PPP_HEADER_LEN sizeof (struct ppp_header)
struct lcp_header {
u_char type;
u_char ident;
u_short len;
} __attribute__((__packed__));
#define LCP_HEADER_LEN sizeof (struct lcp_header)
struct cisco_packet {
u_long type;
u_long par1;
u_long par2;
u_short rel;
u_short time0;
u_short time1;
} __attribute__((__packed__));
#define CISCO_PACKET_LEN sizeof (struct cisco_packet)
/*
* We follow the spelling and capitalization of RFC 1661 here, to make
* it easier comparing with the standard. Please refer to this RFC in
* case you can't make sense out of these abbreviation; it will also
* explain the semantics related to the various events and actions.
*/
struct cp {
u_short proto; /* PPP control protocol number */
u_char protoidx; /* index into state table in struct sppp */
u_char flags;
#define CP_LCP 0x01 /* this is the LCP */
#define CP_AUTH 0x02 /* this is an authentication protocol */
#define CP_NCP 0x04 /* this is a NCP */
#define CP_QUAL 0x08 /* this is a quality reporting protocol */
const char *name; /* name of this control protocol */
/* event handlers */
void (*Up)(struct sppp *sp);
void (*Down)(struct sppp *sp);
void (*Open)(struct sppp *sp);
void (*Close)(struct sppp *sp);
void (*TO)(void *sp);
int (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
/* actions */
void (*tlu)(struct sppp *sp);
void (*tld)(struct sppp *sp);
void (*tls)(struct sppp *sp);
void (*tlf)(struct sppp *sp);
void (*scr)(struct sppp *sp);
};
static struct sppp *spppq;
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
static struct callout_handle keepalive_ch;
#endif
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#define SPP_FMT "%s%d: "
#define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit
#else
#define SPP_FMT "%s: "
#define SPP_ARGS(ifp) (ifp)->if_xname
#endif
#ifdef INET
/*
* The following disgusting hack gets around the problem that IP TOS
* can't be set yet. We want to put "interactive" traffic on a high
* priority queue. To decide if traffic is interactive, we check that
* a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
*
* XXX is this really still necessary? - joerg -
*/
static u_short interactive_ports[8] = {
0, 513, 0, 0,
0, 21, 0, 23,
};
#define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
#endif
/* almost every function needs these */
#define STDDCL \
struct ifnet *ifp = &sp->pp_if; \
int debug = ifp->if_flags & IFF_DEBUG
static int sppp_output(struct ifnet *ifp, struct mbuf *m,
struct sockaddr *dst, struct rtentry *rt);
static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
struct mbuf *m);
static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
u_char ident, u_short len, void *data);
/* static void sppp_cp_timeout(void *arg); */
static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
int newstate);
static void sppp_auth_send(const struct cp *cp,
struct sppp *sp, unsigned int type, unsigned int id,
...);
static void sppp_up_event(const struct cp *cp, struct sppp *sp);
static void sppp_down_event(const struct cp *cp, struct sppp *sp);
static void sppp_open_event(const struct cp *cp, struct sppp *sp);
static void sppp_close_event(const struct cp *cp, struct sppp *sp);
static void sppp_to_event(const struct cp *cp, struct sppp *sp);
static void sppp_null(struct sppp *sp);
static void sppp_lcp_init(struct sppp *sp);
static void sppp_lcp_up(struct sppp *sp);
static void sppp_lcp_down(struct sppp *sp);
static void sppp_lcp_open(struct sppp *sp);
static void sppp_lcp_close(struct sppp *sp);
static void sppp_lcp_TO(void *sp);
static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
static void sppp_lcp_tlu(struct sppp *sp);
static void sppp_lcp_tld(struct sppp *sp);
static void sppp_lcp_tls(struct sppp *sp);
static void sppp_lcp_tlf(struct sppp *sp);
static void sppp_lcp_scr(struct sppp *sp);
static void sppp_lcp_check_and_close(struct sppp *sp);
static int sppp_ncp_check(struct sppp *sp);
static void sppp_ipcp_init(struct sppp *sp);
static void sppp_ipcp_up(struct sppp *sp);
static void sppp_ipcp_down(struct sppp *sp);
static void sppp_ipcp_open(struct sppp *sp);
static void sppp_ipcp_close(struct sppp *sp);
static void sppp_ipcp_TO(void *sp);
static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
static void sppp_ipcp_tlu(struct sppp *sp);
static void sppp_ipcp_tld(struct sppp *sp);
static void sppp_ipcp_tls(struct sppp *sp);
static void sppp_ipcp_tlf(struct sppp *sp);
static void sppp_ipcp_scr(struct sppp *sp);
static void sppp_ipv6cp_init(struct sppp *sp);
static void sppp_ipv6cp_up(struct sppp *sp);
static void sppp_ipv6cp_down(struct sppp *sp);
static void sppp_ipv6cp_open(struct sppp *sp);
static void sppp_ipv6cp_close(struct sppp *sp);
static void sppp_ipv6cp_TO(void *sp);
static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
static void sppp_ipv6cp_tlu(struct sppp *sp);
static void sppp_ipv6cp_tld(struct sppp *sp);
static void sppp_ipv6cp_tls(struct sppp *sp);
static void sppp_ipv6cp_tlf(struct sppp *sp);
static void sppp_ipv6cp_scr(struct sppp *sp);
static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
static void sppp_pap_init(struct sppp *sp);
static void sppp_pap_open(struct sppp *sp);
static void sppp_pap_close(struct sppp *sp);
static void sppp_pap_TO(void *sp);
static void sppp_pap_my_TO(void *sp);
static void sppp_pap_tlu(struct sppp *sp);
static void sppp_pap_tld(struct sppp *sp);
static void sppp_pap_scr(struct sppp *sp);
static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
static void sppp_chap_init(struct sppp *sp);
static void sppp_chap_open(struct sppp *sp);
static void sppp_chap_close(struct sppp *sp);
static void sppp_chap_TO(void *sp);
static void sppp_chap_tlu(struct sppp *sp);
static void sppp_chap_tld(struct sppp *sp);
static void sppp_chap_scr(struct sppp *sp);
static const char *sppp_auth_type_name(u_short proto, u_char type);
static const char *sppp_cp_type_name(u_char type);
static const char *sppp_dotted_quad(u_long addr);
static const char *sppp_ipcp_opt_name(u_char opt);
#ifdef INET6
static const char *sppp_ipv6cp_opt_name(u_char opt);
#endif
static const char *sppp_lcp_opt_name(u_char opt);
static const char *sppp_phase_name(enum ppp_phase phase);
static const char *sppp_proto_name(u_short proto);
static const char *sppp_state_name(int state);
static int sppp_params(struct sppp *sp, u_long cmd, void *data);
static int sppp_strnlen(u_char *p, int max);
static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
u_long *srcmask);
static void sppp_keepalive(void *dummy);
static void sppp_phase_network(struct sppp *sp);
static void sppp_print_bytes(const u_char *p, u_short len);
static void sppp_print_string(const char *p, u_short len);
static void sppp_qflush(struct ifqueue *ifq);
static void sppp_set_ip_addr(struct sppp *sp, u_long src);
#ifdef INET6
static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
struct in6_addr *dst, struct in6_addr *srcmask);
#ifdef IPV6CP_MYIFID_DYN
static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
#endif
static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
#endif
/* our control protocol descriptors */
static const struct cp lcp = {
PPP_LCP, IDX_LCP, CP_LCP, "lcp",
sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
sppp_lcp_scr
};
static const struct cp ipcp = {
PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
sppp_ipcp_scr
};
static const struct cp ipv6cp = {
PPP_IPV6CP, IDX_IPV6CP,
#ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/
CP_NCP,
#else
0,
#endif
"ipv6cp",
sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
sppp_ipv6cp_scr
};
static const struct cp pap = {
PPP_PAP, IDX_PAP, CP_AUTH, "pap",
sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
sppp_pap_TO, 0, 0, 0,
sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
sppp_pap_scr
};
static const struct cp chap = {
PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
sppp_chap_TO, 0, 0, 0,
sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
sppp_chap_scr
};
static const struct cp *cps[IDX_COUNT] = {
&lcp, /* IDX_LCP */
&ipcp, /* IDX_IPCP */
&ipv6cp, /* IDX_IPV6CP */
&pap, /* IDX_PAP */
&chap, /* IDX_CHAP */
};
static int
sppp_modevent(module_t mod, int type, void *unused)
{
switch (type) {
case MOD_LOAD:
break;
case MOD_UNLOAD:
return EACCES;
break;
default:
break;
}
return 0;
}
static moduledata_t spppmod = {
"sppp",
sppp_modevent,
0
};
MODULE_VERSION(sppp, 1);
DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
/*
* Exported functions, comprising our interface to the lower layer.
*/
/*
* Process the received packet.
*/
void
sppp_input(struct ifnet *ifp, struct mbuf *m)
{
struct ppp_header *h;
struct ifqueue *inq = 0;
int s;
struct sppp *sp = (struct sppp *)ifp;
u_char *iphdr;
int hlen, vjlen, do_account = 0;
int debug = ifp->if_flags & IFF_DEBUG;
if (ifp->if_flags & IFF_UP)
/* Count received bytes, add FCS and one flag */
ifp->if_ibytes += m->m_pkthdr.len + 3;
if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
/* Too small packet, drop it. */
if (debug)
log(LOG_DEBUG,
SPP_FMT "input packet is too small, %d bytes\n",
SPP_ARGS(ifp), m->m_pkthdr.len);
drop:
m_freem (m);
drop2:
++ifp->if_ierrors;
++ifp->if_iqdrops;
return;
}
/* Get PPP header. */
h = mtod (m, struct ppp_header*);
m_adj (m, PPP_HEADER_LEN);
switch (h->address) {
case PPP_ALLSTATIONS:
if (h->control != PPP_UI)
goto invalid;
if (sp->pp_mode == IFF_CISCO) {
if (debug)
log(LOG_DEBUG,
SPP_FMT "PPP packet in Cisco mode "
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
SPP_ARGS(ifp),
h->address, h->control, ntohs(h->protocol));
goto drop;
}
switch (ntohs (h->protocol)) {
default:
if (debug)
log(LOG_DEBUG,
SPP_FMT "rejecting protocol "
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
SPP_ARGS(ifp),
h->address, h->control, ntohs(h->protocol));
if (sp->state[IDX_LCP] == STATE_OPENED)
sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
&h->protocol);
++ifp->if_noproto;
goto drop;
case PPP_LCP:
sppp_cp_input(&lcp, sp, m);
m_freem (m);
return;
case PPP_PAP:
if (sp->pp_phase >= PHASE_AUTHENTICATE)
sppp_pap_input(sp, m);
m_freem (m);
return;
case PPP_CHAP:
if (sp->pp_phase >= PHASE_AUTHENTICATE)
sppp_chap_input(sp, m);
m_freem (m);
return;
#ifdef INET
case PPP_IPCP:
if (sp->pp_phase == PHASE_NETWORK)
sppp_cp_input(&ipcp, sp, m);
m_freem (m);
return;
case PPP_IP:
if (sp->state[IDX_IPCP] == STATE_OPENED) {
schednetisr (NETISR_IP);
inq = &ipintrq;
}
do_account++;
break;
case PPP_VJ_COMP:
if (sp->state[IDX_IPCP] == STATE_OPENED) {
if ((vjlen =
sl_uncompress_tcp_core(mtod(m, u_char *),
m->m_len, m->m_len,
TYPE_COMPRESSED_TCP,
sp->pp_comp,
&iphdr, &hlen)) <= 0) {
if (debug)
log(LOG_INFO,
SPP_FMT "VJ uncompress failed on compressed packet\n",
SPP_ARGS(ifp));
goto drop;
}
/*
* Trim the VJ header off the packet, and prepend
* the uncompressed IP header (which will usually
* end up in two chained mbufs since there's not
* enough leading space in the existing mbuf).
*/
m_adj(m, vjlen);
M_PREPEND(m, hlen, M_DONTWAIT);
if (m == NULL)
goto drop2;
bcopy(iphdr, mtod(m, u_char *), hlen);
schednetisr (NETISR_IP);
inq = &ipintrq;
}
do_account++;
break;
case PPP_VJ_UCOMP:
if (sp->state[IDX_IPCP] == STATE_OPENED) {
if (sl_uncompress_tcp_core(mtod(m, u_char *),
m->m_len, m->m_len,
TYPE_UNCOMPRESSED_TCP,
sp->pp_comp,
&iphdr, &hlen) != 0) {
if (debug)
log(LOG_INFO,
SPP_FMT "VJ uncompress failed on uncompressed packet\n",
SPP_ARGS(ifp));
goto drop;
}
schednetisr (NETISR_IP);
inq = &ipintrq;
}
do_account++;
break;
#endif
#ifdef INET6
case PPP_IPV6CP:
if (sp->pp_phase == PHASE_NETWORK)
sppp_cp_input(&ipv6cp, sp, m);
m_freem (m);
return;
case PPP_IPV6:
if (sp->state[IDX_IPV6CP] == STATE_OPENED) {
schednetisr (NETISR_IPV6);
inq = &ip6intrq;
}
do_account++;
break;
#endif
#ifdef IPX
case PPP_IPX:
/* IPX IPXCP not implemented yet */
if (sp->pp_phase == PHASE_NETWORK) {
schednetisr (NETISR_IPX);
inq = &ipxintrq;
}
do_account++;
break;
#endif
#ifdef NS
case PPP_XNS:
/* XNS IDPCP not implemented yet */
if (sp->pp_phase == PHASE_NETWORK) {
schednetisr (NETISR_NS);
inq = &nsintrq;
}
do_account++;
break;
#endif
}
break;
case CISCO_MULTICAST:
case CISCO_UNICAST:
/* Don't check the control field here (RFC 1547). */
if (sp->pp_mode != IFF_CISCO) {
if (debug)
log(LOG_DEBUG,
SPP_FMT "Cisco packet in PPP mode "
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
SPP_ARGS(ifp),
h->address, h->control, ntohs(h->protocol));
goto drop;
}
switch (ntohs (h->protocol)) {
default:
++ifp->if_noproto;
goto invalid;
case CISCO_KEEPALIVE:
sppp_cisco_input ((struct sppp*) ifp, m);
m_freem (m);
return;
#ifdef INET
case ETHERTYPE_IP:
schednetisr (NETISR_IP);
inq = &ipintrq;
do_account++;
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
schednetisr (NETISR_IPV6);
inq = &ip6intrq;
do_account++;
break;
#endif
#ifdef IPX
case ETHERTYPE_IPX:
schednetisr (NETISR_IPX);
inq = &ipxintrq;
do_account++;
break;
#endif
#ifdef NS
case ETHERTYPE_NS:
schednetisr (NETISR_NS);
inq = &nsintrq;
do_account++;
break;
#endif
}
break;
default: /* Invalid PPP packet. */
invalid:
if (debug)
log(LOG_DEBUG,
SPP_FMT "invalid input packet "
"<addr=0x%x ctrl=0x%x proto=0x%x>\n",
SPP_ARGS(ifp),
h->address, h->control, ntohs(h->protocol));
goto drop;
}
if (! (ifp->if_flags & IFF_UP) || ! inq)
goto drop;
/* Check queue. */
s = splimp();
if (IF_QFULL (inq)) {
/* Queue overflow. */
IF_DROP(inq);
splx(s);
if (debug)
log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
SPP_ARGS(ifp));
goto drop;
}
IF_ENQUEUE(inq, m);
splx(s);
if (do_account)
/*
* Do only account for network packets, not for control
* packets. This is used by some subsystems to detect
* idle lines.
*/
sp->pp_last_recv = time_second;
}
/*
* Enqueue transmit packet.
*/
static int
sppp_output(struct ifnet *ifp, struct mbuf *m,
struct sockaddr *dst, struct rtentry *rt)
{
struct sppp *sp = (struct sppp*) ifp;
struct ppp_header *h;
struct ifqueue *ifq = NULL;
int s, rv = 0;
int ipproto = PPP_IP;
int debug = ifp->if_flags & IFF_DEBUG;
s = splimp();
if ((ifp->if_flags & IFF_UP) == 0 ||
(ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
#ifdef INET6
drop:
#endif
m_freem (m);
splx (s);
return (ENETDOWN);
}
if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
#ifdef INET6
/*
* XXX
*
* Hack to prevent the initialization-time generated
* IPv6 multicast packet to erroneously cause a
* dialout event in case IPv6 has been
* administratively disabled on that interface.
*/
if (dst->sa_family == AF_INET6 &&
!(sp->confflags & CONF_ENABLE_IPV6))
goto drop;
#endif
/*
* Interface is not yet running, but auto-dial. Need
* to start LCP for it.
*/
ifp->if_flags |= IFF_RUNNING;
splx(s);
lcp.Open(sp);
s = splimp();
}
ifq = &ifp->if_snd;
#ifdef INET
if (dst->sa_family == AF_INET) {
/* XXX Check mbuf length here? */
struct ip *ip = mtod (m, struct ip*);
struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
/*
* When using dynamic local IP address assignment by using
* 0.0.0.0 as a local address, the first TCP session will
* not connect because the local TCP checksum is computed
* using 0.0.0.0 which will later become our real IP address
* so the TCP checksum computed at the remote end will
* become invalid. So we
* - don't let packets with src ip addr 0 thru
* - we flag TCP packets with src ip 0 as an error
*/
if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */
{
m_freem(m);
splx(s);
if(ip->ip_p == IPPROTO_TCP)
return(EADDRNOTAVAIL);
else
return(0);
}
/*
* Put low delay, telnet, rlogin and ftp control packets
* in front of the queue.
*/
if (IF_QFULL (&sp->pp_fastq))
;
else if (ip->ip_tos & IPTOS_LOWDELAY)
ifq = &sp->pp_fastq;
else if (m->m_len < sizeof *ip + sizeof *tcp)
;
else if (ip->ip_p != IPPROTO_TCP)
;
else if (INTERACTIVE (ntohs (tcp->th_sport)))
ifq = &sp->pp_fastq;
else if (INTERACTIVE (ntohs (tcp->th_dport)))
ifq = &sp->pp_fastq;
/*
* Do IP Header compression
*/
if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) &&
ip->ip_p == IPPROTO_TCP)
switch (sl_compress_tcp(m, ip, sp->pp_comp,
sp->ipcp.compress_cid)) {
case TYPE_COMPRESSED_TCP:
ipproto = PPP_VJ_COMP;
break;
case TYPE_UNCOMPRESSED_TCP:
ipproto = PPP_VJ_UCOMP;
break;
case TYPE_IP:
ipproto = PPP_IP;
break;
default:
m_freem(m);
splx(s);
return (EINVAL);
}
}
#endif
#ifdef INET6
if (dst->sa_family == AF_INET6) {
/* XXX do something tricky here? */
}
#endif
/*
* Prepend general data packet PPP header. For now, IP only.
*/
M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT);
if (! m) {
if (debug)
log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
SPP_ARGS(ifp));
++ifp->if_oerrors;
splx (s);
return (ENOBUFS);
}
/*
* May want to check size of packet
* (albeit due to the implementation it's always enough)
*/
h = mtod (m, struct ppp_header*);
if (sp->pp_mode == IFF_CISCO) {
h->address = CISCO_UNICAST; /* unicast address */
h->control = 0;
} else {
h->address = PPP_ALLSTATIONS; /* broadcast address */
h->control = PPP_UI; /* Unnumbered Info */
}
switch (dst->sa_family) {
#ifdef INET
case AF_INET: /* Internet Protocol */
if (sp->pp_mode == IFF_CISCO)
h->protocol = htons (ETHERTYPE_IP);
else {
/*
* Don't choke with an ENETDOWN early. It's
* possible that we just started dialing out,
* so don't drop the packet immediately. If
* we notice that we run out of buffer space
* below, we will however remember that we are
* not ready to carry IP packets, and return
* ENETDOWN, as opposed to ENOBUFS.
*/
h->protocol = htons(ipproto);
if (sp->state[IDX_IPCP] != STATE_OPENED)
rv = ENETDOWN;
}
break;
#endif
#ifdef INET6
case AF_INET6: /* Internet Protocol */
if (sp->pp_mode == IFF_CISCO)
h->protocol = htons (ETHERTYPE_IPV6);
else {
/*
* Don't choke with an ENETDOWN early. It's
* possible that we just started dialing out,
* so don't drop the packet immediately. If
* we notice that we run out of buffer space
* below, we will however remember that we are
* not ready to carry IP packets, and return
* ENETDOWN, as opposed to ENOBUFS.
*/
h->protocol = htons(PPP_IPV6);
if (sp->state[IDX_IPV6CP] != STATE_OPENED)
rv = ENETDOWN;
}
break;
#endif
#ifdef NS
case AF_NS: /* Xerox NS Protocol */
h->protocol = htons (sp->pp_mode == IFF_CISCO ?
ETHERTYPE_NS : PPP_XNS);
break;
#endif
#ifdef IPX
case AF_IPX: /* Novell IPX Protocol */
h->protocol = htons (sp->pp_mode == IFF_CISCO ?
ETHERTYPE_IPX : PPP_IPX);
break;
#endif
default:
m_freem (m);
++ifp->if_oerrors;
splx (s);
return (EAFNOSUPPORT);
}
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
if (IF_QFULL (ifq)) {
IF_DROP (&ifp->if_snd);
m_freem (m);
++ifp->if_oerrors;
splx (s);
return (rv? rv: ENOBUFS);
}
IF_ENQUEUE (ifq, m);
if (! (ifp->if_flags & IFF_OACTIVE))
(*ifp->if_start) (ifp);
/*
* Count output packets and bytes.
* The packet length includes header, FCS and 1 flag,
* according to RFC 1333.
*/
ifp->if_obytes += m->m_pkthdr.len + 3;
splx (s);
/*