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alias_db.c (33897) alias_db.c (35314)
1/* -*- mode: c; tab-width: 8; c-basic-indent: 4; -*-
2 Alias_db.c encapsulates all data structures used for storing
3 packet aliasing data. Other parts of the aliasing software
4 access data through functions provided in this file.
5
6 Data storage is based on the notion of a "link", which is
7 established for ICMP echo/reply packets, UDP datagrams and
8 TCP stream connections. A link stores the original source

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335
336static FILE *monitorFile; /* File descriptor for link */
337 /* statistics monitoring file */
338
339static int newDefaultLink; /* Indicates if a new aliasing */
340 /* link has been created after a */
341 /* call to PacketAliasIn/Out(). */
342
1/* -*- mode: c; tab-width: 8; c-basic-indent: 4; -*-
2 Alias_db.c encapsulates all data structures used for storing
3 packet aliasing data. Other parts of the aliasing software
4 access data through functions provided in this file.
5
6 Data storage is based on the notion of a "link", which is
7 established for ICMP echo/reply packets, UDP datagrams and
8 TCP stream connections. A link stores the original source

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335
336static FILE *monitorFile; /* File descriptor for link */
337 /* statistics monitoring file */
338
339static int newDefaultLink; /* Indicates if a new aliasing */
340 /* link has been created after a */
341 /* call to PacketAliasIn/Out(). */
342
343#ifndef NO_FW_PUNCH
343static int fireWallFD = -1; /* File descriptor to be able to */
344 /* control firewall. Opened by */
345 /* PacketAliasSetMode on first */
346 /* setting the PKT_ALIAS_PUNCH_FW */
347 /* flag. */
344static int fireWallFD = -1; /* File descriptor to be able to */
345 /* control firewall. Opened by */
346 /* PacketAliasSetMode on first */
347 /* setting the PKT_ALIAS_PUNCH_FW */
348 /* flag. */
349#endif
348
349
350
351
352
353
354/* Internal utility routines (used only in alias_db.c)
355

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370
371static u_int StartPointOut(struct in_addr, struct in_addr,
372 u_short, u_short, int);
373
374static int SeqDiff(u_long, u_long);
375
376static void ShowAliasStats(void);
377
350
351
352
353
354
355
356/* Internal utility routines (used only in alias_db.c)
357

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372
373static u_int StartPointOut(struct in_addr, struct in_addr,
374 u_short, u_short, int);
375
376static int SeqDiff(u_long, u_long);
377
378static void ShowAliasStats(void);
379
380#ifndef NO_FW_PUNCH
378/* Firewall control */
379static void InitPunchFW(void);
380static void UninitPunchFW(void);
381static void ClearFWHole(struct alias_link *link);
381/* Firewall control */
382static void InitPunchFW(void);
383static void UninitPunchFW(void);
384static void ClearFWHole(struct alias_link *link);
385#endif
382
383/* Log file control */
384static void InitPacketAliasLog(void);
385static void UninitPacketAliasLog(void);
386
387static u_int
388StartPointIn(struct in_addr alias_addr,
389 u_short alias_port,

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745{
746 struct alias_link *link_last;
747 struct alias_link *link_next;
748
749/* Don't do anything if the link is marked permanent */
750 if (deleteAllLinks == 0 && link->flags & LINK_PERMANENT)
751 return;
752
386
387/* Log file control */
388static void InitPacketAliasLog(void);
389static void UninitPacketAliasLog(void);
390
391static u_int
392StartPointIn(struct in_addr alias_addr,
393 u_short alias_port,

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749{
750 struct alias_link *link_last;
751 struct alias_link *link_next;
752
753/* Don't do anything if the link is marked permanent */
754 if (deleteAllLinks == 0 && link->flags & LINK_PERMANENT)
755 return;
756
757#ifndef NO_FW_PUNCH
753/* Delete associatied firewall hole, if any */
754 ClearFWHole(link);
758/* Delete associatied firewall hole, if any */
759 ClearFWHole(link);
760#endif
755
756/* Adjust output table pointers */
757 link_last = link->last_out;
758 link_next = link->next_out;
759
760 if (link_last != NULL)
761 link_last->next_out = link_next;
762 else

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982 int alias_port_param, /* if less than zero, alias */
983 int link_type) /* port will be automatically */
984{ /* chosen. If greater than */
985 struct alias_link *new_link; /* zero, equal to alias port */
986
987 new_link = AddLink(src_addr, dst_addr, alias_addr,
988 src_port, dst_port, alias_port_param,
989 link_type);
761
762/* Adjust output table pointers */
763 link_last = link->last_out;
764 link_next = link->next_out;
765
766 if (link_last != NULL)
767 link_last->next_out = link_next;
768 else

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988 int alias_port_param, /* if less than zero, alias */
989 int link_type) /* port will be automatically */
990{ /* chosen. If greater than */
991 struct alias_link *new_link; /* zero, equal to alias port */
992
993 new_link = AddLink(src_addr, dst_addr, alias_addr,
994 src_port, dst_port, alias_port_param,
995 link_type);
996#ifndef NO_FW_PUNCH
990 if (new_link != NULL &&
991 old_link->link_type == LINK_TCP &&
992 old_link->data.tcp &&
993 old_link->data.tcp->fwhole > 0) {
994 PunchFWHole(new_link);
995 }
997 if (new_link != NULL &&
998 old_link->link_type == LINK_TCP &&
999 old_link->data.tcp &&
1000 old_link->data.tcp->fwhole > 0) {
1001 PunchFWHole(new_link);
1002 }
1003#endif
996 DeleteLink(old_link);
997 return new_link;
998}
999
1000static struct alias_link *
1001FindLinkOut(struct in_addr src_addr,
1002 struct in_addr dst_addr,
1003 u_short src_port,

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2000}
2001
2002void
2003PacketAliasUninit(void) {
2004 deleteAllLinks = 1;
2005 CleanupAliasData();
2006 deleteAllLinks = 0;
2007 UninitPacketAliasLog();
1004 DeleteLink(old_link);
1005 return new_link;
1006}
1007
1008static struct alias_link *
1009FindLinkOut(struct in_addr src_addr,
1010 struct in_addr dst_addr,
1011 u_short src_port,

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2008}
2009
2010void
2011PacketAliasUninit(void) {
2012 deleteAllLinks = 1;
2013 CleanupAliasData();
2014 deleteAllLinks = 0;
2015 UninitPacketAliasLog();
2016#ifndef NO_FW_PUNCH
2008 UninitPunchFW();
2017 UninitPunchFW();
2018#endif
2009}
2010
2011
2012/* Change mode for some operations */
2013unsigned int
2014PacketAliasSetMode(
2015 unsigned int flags, /* Which state to bring flags to */
2016 unsigned int mask /* Mask of which flags to affect (use 0 to do a

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2022 {
2023 InitPacketAliasLog(); /* Do the enable */
2024 } else
2025/* _Disable_ logging? */
2026 if (~flags & mask & PKT_ALIAS_LOG) {
2027 UninitPacketAliasLog();
2028 }
2029
2019}
2020
2021
2022/* Change mode for some operations */
2023unsigned int
2024PacketAliasSetMode(
2025 unsigned int flags, /* Which state to bring flags to */
2026 unsigned int mask /* Mask of which flags to affect (use 0 to do a

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2032 {
2033 InitPacketAliasLog(); /* Do the enable */
2034 } else
2035/* _Disable_ logging? */
2036 if (~flags & mask & PKT_ALIAS_LOG) {
2037 UninitPacketAliasLog();
2038 }
2039
2040#ifndef NO_FW_PUNCH
2030/* Start punching holes in the firewall? */
2031 if (flags & mask & PKT_ALIAS_PUNCH_FW) {
2032 InitPunchFW();
2033 } else
2034/* Stop punching holes in the firewall? */
2035 if (~flags & mask & PKT_ALIAS_PUNCH_FW) {
2036 UninitPunchFW();
2037 }
2041/* Start punching holes in the firewall? */
2042 if (flags & mask & PKT_ALIAS_PUNCH_FW) {
2043 InitPunchFW();
2044 } else
2045/* Stop punching holes in the firewall? */
2046 if (~flags & mask & PKT_ALIAS_PUNCH_FW) {
2047 UninitPunchFW();
2048 }
2049#endif
2038
2039/* Other flags can be set/cleared without special action */
2040 packetAliasMode = (flags & mask) | (packetAliasMode & ~mask);
2041 return packetAliasMode;
2042}
2043
2044
2045int
2046PacketAliasCheckNewLink(void)
2047{
2048 return newDefaultLink;
2049}
2050
2051
2050
2051/* Other flags can be set/cleared without special action */
2052 packetAliasMode = (flags & mask) | (packetAliasMode & ~mask);
2053 return packetAliasMode;
2054}
2055
2056
2057int
2058PacketAliasCheckNewLink(void)
2059{
2060 return newDefaultLink;
2061}
2062
2063
2064#ifndef NO_FW_PUNCH
2065
2052/*****************
2053 Code to support firewall punching. This shouldn't really be in this
2054 file, but making variables global is evil too.
2055 ****************/
2056
2057/* Firewall include files */
2058#include <sys/queue.h>
2059#include <net/if.h>

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2217 memset(&rule, 0, sizeof rule);
2218 for (i = fireWallBaseNum; i < fireWallBaseNum + fireWallNumNums; i++) {
2219 rule.fw_number = i;
2220 while (!setsockopt(fireWallFD, IPPROTO_IP, IP_FW_DEL, &rule, sizeof rule))
2221 ;
2222 }
2223 memset(fireWallField, 0, fireWallNumNums);
2224}
2066/*****************
2067 Code to support firewall punching. This shouldn't really be in this
2068 file, but making variables global is evil too.
2069 ****************/
2070
2071/* Firewall include files */
2072#include <sys/queue.h>
2073#include <net/if.h>

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2231 memset(&rule, 0, sizeof rule);
2232 for (i = fireWallBaseNum; i < fireWallBaseNum + fireWallNumNums; i++) {
2233 rule.fw_number = i;
2234 while (!setsockopt(fireWallFD, IPPROTO_IP, IP_FW_DEL, &rule, sizeof rule))
2235 ;
2236 }
2237 memset(fireWallField, 0, fireWallNumNums);
2238}
2239#endif