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Differential D30253 Diff 89255 sys/netinet/libalias/alias_db.c

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sys/netinet/libalias/alias_db.c

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/* Dummy port number codes used for FindLinkIn/Out() and AddLink(). /* Dummy port number codes used for FindLinkIn/Out() and AddLink().
These constants can be anything except zero, which indicates an These constants can be anything except zero, which indicates an
unknown port number. */ unknown port number. */
#define NO_DEST_PORT 1 #define NO_DEST_PORT 1
#define NO_SRC_PORT 1 #define NO_SRC_PORT 1
/* Dummy address used for FindLinkIn/Out() and AddLink().
hselaskyUnsubmitted
Done
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Should it be:
static const struct in_addr ???

hselasky: Should it be: static const struct in_addr ???
donnerAuthorUnsubmitted
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The compiler had the same question. Thank you for spotting this.

donner: The compiler had the same question. Thank you for spotting this.
The value of this variable is never used. */
static struct in_addr const NO_ADDR;
hselaskyUnsubmitted
Done
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Should you also add "const" keyword here?

hselasky: Should you also add "const" keyword here?
donnerAuthorUnsubmitted
Done
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You are right. Added const.

donner: You are right. Added const.
/* Data Structures /* Data Structures
The fundamental data structure used in this program is The fundamental data structure used in this program is
"struct alias_link". Whenever a TCP connection is made, "struct alias_link". Whenever a TCP connection is made,
a UDP datagram is sent out, or an ICMP echo request is made, a UDP datagram is sent out, or an ICMP echo request is made,
a link record is made (if it has not already been created). a link record is made (if it has not already been created).
The link record is identified by the source address/port The link record is identified by the source address/port
and the destination address/port. In the case of an ICMP and the destination address/port. In the case of an ICMP
▲ Show 20 Lines • Show All 871 Lines • ▼ Show 20 Lines_FindLinkOut(struct libalias *la, struct in_addr src_addr,
} }
/* Search for partially specified links. */ /* Search for partially specified links. */
if (lnk == NULL && replace_partial_links) { if (lnk == NULL && replace_partial_links) {
if (dst_port != 0 && dst_addr.s_addr != INADDR_ANY) { if (dst_port != 0 && dst_addr.s_addr != INADDR_ANY) {
lnk = _FindLinkOut(la, src_addr, dst_addr, src_port, 0, lnk = _FindLinkOut(la, src_addr, dst_addr, src_port, 0,
link_type, 0); link_type, 0);
if (lnk == NULL) if (lnk == NULL)
lnk = _FindLinkOut(la, src_addr, la->nullAddress, src_port, lnk = _FindLinkOut(la, src_addr, NO_ADDR, src_port,
dst_port, link_type, 0); dst_port, link_type, 0);
} }
if (lnk == NULL && if (lnk == NULL &&
(dst_port != 0 || dst_addr.s_addr != INADDR_ANY)) { (dst_port != 0 || dst_addr.s_addr != INADDR_ANY)) {
lnk = _FindLinkOut(la, src_addr, la->nullAddress, src_port, 0, lnk = _FindLinkOut(la, src_addr, NO_ADDR, src_port, 0,
link_type, 0); link_type, 0);
} }
if (lnk != NULL) { if (lnk != NULL) {
lnk = ReLink(lnk, lnk = ReLink(lnk,
src_addr, dst_addr, lnk->alias_addr, src_addr, dst_addr, lnk->alias_addr,
src_port, dst_port, lnk->alias_port, src_port, dst_port, lnk->alias_port,
link_type); link_type);
} }
Show All 19 Lines if (lnk == NULL) {
/* /*
* The following allows permanent links to be specified as * The following allows permanent links to be specified as
* using the default source address (i.e. device interface * using the default source address (i.e. device interface
* address) without knowing in advance what that address * address) without knowing in advance what that address
* is. * is.
*/ */
if (la->aliasAddress.s_addr != INADDR_ANY && if (la->aliasAddress.s_addr != INADDR_ANY &&
src_addr.s_addr == la->aliasAddress.s_addr) { src_addr.s_addr == la->aliasAddress.s_addr) {
lnk = _FindLinkOut(la, la->nullAddress, dst_addr, src_port, dst_port, lnk = _FindLinkOut(la, NO_ADDR, dst_addr, src_port, dst_port,
link_type, replace_partial_links); link_type, replace_partial_links);
} }
} }
return (lnk); return (lnk);
} }
static struct alias_link * static struct alias_link *
_FindLinkIn(struct libalias *la, struct in_addr dst_addr, _FindLinkIn(struct libalias *la, struct in_addr dst_addr,
▲ Show 20 Lines • Show All 125 Lines • ▼ Show 20 Lines if (lnk == NULL) {
/* /*
* The following allows permanent links to be specified as * The following allows permanent links to be specified as
* using the default aliasing address (i.e. device * using the default aliasing address (i.e. device
* interface address) without knowing in advance what that * interface address) without knowing in advance what that
* address is. * address is.
*/ */
if (la->aliasAddress.s_addr != INADDR_ANY && if (la->aliasAddress.s_addr != INADDR_ANY &&
alias_addr.s_addr == la->aliasAddress.s_addr) { alias_addr.s_addr == la->aliasAddress.s_addr) {
lnk = _FindLinkIn(la, dst_addr, la->nullAddress, dst_port, alias_port, lnk = _FindLinkIn(la, dst_addr, NO_ADDR, dst_port, alias_port,
link_type, replace_partial_links); link_type, replace_partial_links);
} }
} }
return (lnk); return (lnk);
} }
/* External routines for finding/adding links /* External routines for finding/adding links
▲ Show 20 Lines • Show All 65 Lines • ▼ Show 20 LinesFindFragmentIn1(struct libalias *la, struct in_addr dst_addr,
struct alias_link *lnk; struct alias_link *lnk;
LIBALIAS_LOCK_ASSERT(la); LIBALIAS_LOCK_ASSERT(la);
lnk = FindLinkIn(la, dst_addr, alias_addr, lnk = FindLinkIn(la, dst_addr, alias_addr,
NO_DEST_PORT, ip_id, NO_DEST_PORT, ip_id,
LINK_FRAGMENT_ID, 0); LINK_FRAGMENT_ID, 0);
if (lnk == NULL) { if (lnk == NULL) {
lnk = AddLink(la, la->nullAddress, dst_addr, alias_addr, lnk = AddLink(la, NO_ADDR, dst_addr, alias_addr,
NO_SRC_PORT, NO_DEST_PORT, ip_id, NO_SRC_PORT, NO_DEST_PORT, ip_id,
LINK_FRAGMENT_ID); LINK_FRAGMENT_ID);
} }
return (lnk); return (lnk);
} }
/* Doesn't add a link if one is not found. */ /* Doesn't add a link if one is not found. */
struct alias_link * struct alias_link *
FindFragmentIn2(struct libalias *la, struct in_addr dst_addr, FindFragmentIn2(struct libalias *la, struct in_addr dst_addr,
struct in_addr alias_addr, u_short ip_id) struct in_addr alias_addr, u_short ip_id)
{ {
LIBALIAS_LOCK_ASSERT(la); LIBALIAS_LOCK_ASSERT(la);
return FindLinkIn(la, dst_addr, alias_addr, return FindLinkIn(la, dst_addr, alias_addr,
NO_DEST_PORT, ip_id, NO_DEST_PORT, ip_id,
LINK_FRAGMENT_ID, 0); LINK_FRAGMENT_ID, 0);
} }
struct alias_link * struct alias_link *
AddFragmentPtrLink(struct libalias *la, struct in_addr dst_addr, AddFragmentPtrLink(struct libalias *la, struct in_addr dst_addr,
u_short ip_id) u_short ip_id)
{ {
LIBALIAS_LOCK_ASSERT(la); LIBALIAS_LOCK_ASSERT(la);
return AddLink(la, la->nullAddress, dst_addr, la->nullAddress, return AddLink(la, NO_ADDR, dst_addr, NO_ADDR,
NO_SRC_PORT, NO_DEST_PORT, ip_id, NO_SRC_PORT, NO_DEST_PORT, ip_id,
LINK_FRAGMENT_PTR); LINK_FRAGMENT_PTR);
} }
struct alias_link * struct alias_link *
FindFragmentPtr(struct libalias *la, struct in_addr dst_addr, FindFragmentPtr(struct libalias *la, struct in_addr dst_addr,
u_short ip_id) u_short ip_id)
{ {
LIBALIAS_LOCK_ASSERT(la); LIBALIAS_LOCK_ASSERT(la);
return FindLinkIn(la, dst_addr, la->nullAddress, return FindLinkIn(la, dst_addr, NO_ADDR,
NO_DEST_PORT, ip_id, NO_DEST_PORT, ip_id,
LINK_FRAGMENT_PTR, 0); LINK_FRAGMENT_PTR, 0);
} }
struct alias_link * struct alias_link *
FindProtoIn(struct libalias *la, struct in_addr dst_addr, FindProtoIn(struct libalias *la, struct in_addr dst_addr,
struct in_addr alias_addr, struct in_addr alias_addr,
u_char proto) u_char proto)
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} }
struct in_addr struct in_addr
FindOriginalAddress(struct libalias *la, struct in_addr alias_addr) FindOriginalAddress(struct libalias *la, struct in_addr alias_addr)
{ {
struct alias_link *lnk; struct alias_link *lnk;
LIBALIAS_LOCK_ASSERT(la); LIBALIAS_LOCK_ASSERT(la);
lnk = FindLinkIn(la, la->nullAddress, alias_addr, lnk = FindLinkIn(la, NO_ADDR, alias_addr,
0, 0, LINK_ADDR, 0); 0, 0, LINK_ADDR, 0);
if (lnk == NULL) { if (lnk == NULL) {
la->newDefaultLink = 1; la->newDefaultLink = 1;
if (la->targetAddress.s_addr == INADDR_ANY) if (la->targetAddress.s_addr == INADDR_ANY)
return (alias_addr); return (alias_addr);
else if (la->targetAddress.s_addr == INADDR_NONE) else if (la->targetAddress.s_addr == INADDR_NONE)
return (la->aliasAddress.s_addr != INADDR_ANY) ? return (la->aliasAddress.s_addr != INADDR_ANY) ?
la->aliasAddress : alias_addr; la->aliasAddress : alias_addr;
Show All 15 Lines
} }
struct in_addr struct in_addr
FindAliasAddress(struct libalias *la, struct in_addr original_addr) FindAliasAddress(struct libalias *la, struct in_addr original_addr)
{ {
struct alias_link *lnk; struct alias_link *lnk;
LIBALIAS_LOCK_ASSERT(la); LIBALIAS_LOCK_ASSERT(la);
lnk = FindLinkOut(la, original_addr, la->nullAddress, lnk = FindLinkOut(la, original_addr, NO_ADDR,
0, 0, LINK_ADDR, 0); 0, 0, LINK_ADDR, 0);
if (lnk == NULL) { if (lnk == NULL) {
return (la->aliasAddress.s_addr != INADDR_ANY) ? return (la->aliasAddress.s_addr != INADDR_ANY) ?
la->aliasAddress : original_addr; la->aliasAddress : original_addr;
} else { } else {
if (lnk->alias_addr.s_addr == INADDR_ANY) if (lnk->alias_addr.s_addr == INADDR_ANY)
return (la->aliasAddress.s_addr != INADDR_ANY) ? return (la->aliasAddress.s_addr != INADDR_ANY) ?
la->aliasAddress : original_addr; la->aliasAddress : original_addr;
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/* Static address translation */ /* Static address translation */
struct alias_link * struct alias_link *
LibAliasRedirectAddr(struct libalias *la, struct in_addr src_addr, LibAliasRedirectAddr(struct libalias *la, struct in_addr src_addr,
struct in_addr alias_addr) struct in_addr alias_addr)
{ {
struct alias_link *lnk; struct alias_link *lnk;
LIBALIAS_LOCK(la); LIBALIAS_LOCK(la);
lnk = AddLink(la, src_addr, la->nullAddress, alias_addr, lnk = AddLink(la, src_addr, NO_ADDR, alias_addr,
0, 0, 0, 0, 0, 0,
LINK_ADDR); LINK_ADDR);
if (lnk != NULL) { if (lnk != NULL) {
lnk->flags |= LINK_PERMANENT; lnk->flags |= LINK_PERMANENT;
} }
#ifdef LIBALIAS_DEBUG #ifdef LIBALIAS_DEBUG
else { else {
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