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libalias: Restructure - Table for partially links

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Separate the partially specified links into a separate data structure.

This would causes a major parformance impact, if there are many of
them.  Use a (smaller) hash table to speed up the partially link
access.

MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D30570
This commit is contained in:
Lutz Donnerhacke 2021-05-25 18:27:33 +02:00
parent 74d7fc8753
commit cac129e603
2 changed files with 52 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

74
sys/netinet/libalias/alias_db.c
View file

@ -401,6 +401,13 @@ static void UninitPacketAliasLog(struct libalias *);
void SctpShowAliasStats(struct libalias *la);
static u_int
StartPartialIn(u_short alias_port, int link_type)
{
return (link_type == LINK_PPTP) ? 0
: (alias_port % LINK_PARTIAL_SIZE);
}
static u_int
StartPointIn(struct in_addr alias_addr,
u_short alias_port,
@ -1036,8 +1043,13 @@ AddLink(struct libalias *la, struct in_addr src_addr, struct in_addr dst_addr,
LIST_INSERT_HEAD(&la->linkTableOut[start_point], lnk, list_out);
/* Set up pointers for input lookup table */
start_point = StartPointIn(alias_addr, lnk->alias_port, link_type);
LIST_INSERT_HEAD(&la->linkTableIn[start_point], lnk, list_in);
if (lnk->flags & LINK_PARTIALLY_SPECIFIED) {
start_point = StartPartialIn(lnk->alias_port, link_type);
LIST_INSERT_HEAD(&la->linkPartialIn[start_point], lnk, list_in);
} else {
start_point = StartPointIn(alias_addr, lnk->alias_port, link_type);
LIST_INSERT_HEAD(&la->linkTableIn[start_point], lnk, list_in);
}
/* Include the element into the housekeeping list */
TAILQ_INSERT_TAIL(&la->checkExpire, lnk, list_expire);
@ -1213,8 +1225,6 @@ _FindLinkIn(struct libalias *la, struct in_addr dst_addr,
if (!(flags_in & LINK_PARTIALLY_SPECIFIED)) {
LIST_FOREACH(lnk, &la->linkTableIn[start_point], list_in) {
INGUARD;
if (lnk->flags & LINK_PARTIALLY_SPECIFIED)
continue;
if (lnk->dst_addr.s_addr == dst_addr.s_addr
&& lnk->dst_port == dst_port) {
CleanupLink(la, &lnk);
@ -1224,26 +1234,42 @@ _FindLinkIn(struct libalias *la, struct in_addr dst_addr,
}
}
}
} else {
LIST_FOREACH(lnk, &la->linkTableIn[start_point], list_in) {
int flags = flags_in & LINK_PARTIALLY_SPECIFIED;
INGUARD;
if (flags == LINK_PARTIALLY_SPECIFIED &&
lnk_unknown_all == NULL)
lnk_unknown_all = lnk;
if (flags == LINK_UNKNOWN_DEST_ADDR &&
lnk->dst_port == dst_port &&
lnk_unknown_dst_addr == NULL)
lnk_unknown_dst_addr = lnk;
if (flags == LINK_UNKNOWN_DEST_PORT &&
lnk->dst_addr.s_addr == dst_addr.s_addr) {
lnk_unknown_dst_port = lnk;
break;
}
}
}
LIST_FOREACH(lnk, &la->linkTableIn[start_point], list_in) {
int flags;
start_point = StartPartialIn(alias_port, link_type);
LIST_FOREACH(lnk, &la->linkPartialIn[start_point], list_in) {
int flags = (flags_in | lnk->flags) & LINK_PARTIALLY_SPECIFIED;
INGUARD;
flags = flags_in | lnk->flags;
if ((flags & LINK_UNKNOWN_DEST_ADDR)
&& (flags & LINK_UNKNOWN_DEST_PORT)) {
if (lnk_unknown_all == NULL)
lnk_unknown_all = lnk;
} else if (flags & LINK_UNKNOWN_DEST_ADDR) {
if (lnk->dst_port == dst_port) {
if (lnk_unknown_dst_addr == NULL)
lnk_unknown_dst_addr = lnk;
}
} else if (flags & LINK_UNKNOWN_DEST_PORT) {
if (lnk->dst_addr.s_addr == dst_addr.s_addr) {
if (lnk_unknown_dst_port == NULL)
lnk_unknown_dst_port = lnk;
}
if (flags == LINK_PARTIALLY_SPECIFIED &&
lnk_unknown_all == NULL)
lnk_unknown_all = lnk;
if (flags == LINK_UNKNOWN_DEST_ADDR &&
lnk->dst_port == dst_port &&
lnk_unknown_dst_addr == NULL)
lnk_unknown_dst_addr = lnk;
if (flags == LINK_UNKNOWN_DEST_PORT &&
lnk->dst_addr.s_addr == dst_addr.s_addr) {
lnk_unknown_dst_port = lnk;
break;
}
}
#undef INGUARD
@ -1612,12 +1638,10 @@ FindPptpInByCallId(struct libalias *la, struct in_addr dst_addr,
struct in_addr alias_addr,
u_int16_t dst_call_id)
{
u_int i;
struct alias_link *lnk;
LIBALIAS_LOCK_ASSERT(la);
i = StartPointIn(alias_addr, 0, LINK_PPTP);
LIST_FOREACH(lnk, &la->linkTableIn[i], list_in)
LIST_FOREACH(lnk, &la->linkPartialIn[0], list_in)
if (lnk->link_type == LINK_PPTP &&
lnk->dst_addr.s_addr == dst_addr.s_addr &&
lnk->alias_addr.s_addr == alias_addr.s_addr &&
@ -2447,6 +2471,8 @@ LibAliasInit(struct libalias *la)
LIST_INIT(&la->linkTableOut[i]);
for (i = 0; i < LINK_TABLE_IN_SIZE; i++)
LIST_INIT(&la->linkTableIn[i]);
for (i = 0; i < LINK_PARTIAL_SIZE; i++)
LIST_INIT(&la->linkPartialIn[i]);
TAILQ_INIT(&la->checkExpire);
#ifdef _KERNEL
AliasSctpInit(la);

2
sys/netinet/libalias/alias_local.h
View file

@ -68,6 +68,7 @@
/* Sizes of input and output link tables */
#define LINK_TABLE_OUT_SIZE 4001
#define LINK_TABLE_IN_SIZE 4001
#define LINK_PARTIAL_SIZE 401
#define GET_ALIAS_PORT -1
#define GET_ALIAS_ID GET_ALIAS_PORT
@ -94,6 +95,7 @@ struct libalias {
* output lookup tables. */
LIST_HEAD (, alias_link) linkTableOut[LINK_TABLE_OUT_SIZE];
LIST_HEAD (, alias_link) linkTableIn[LINK_TABLE_IN_SIZE];
LIST_HEAD (, alias_link) linkPartialIn[LINK_PARTIAL_SIZE];
/* HouseKeeping */
TAILQ_HEAD (, alias_link) checkExpire;
/* Link statistics */