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Differential D23450 Diff 68023 sys/netinet/libalias/alias_db.c

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sys/netinet/libalias/alias_db.c

Show First 20 Lines • Show All 590 Lines • ▼ Show 20 Lines*/
if (alias_port_param == GET_ALIAS_PORT) { if (alias_port_param == GET_ALIAS_PORT) {
/* /*
* The aliasing port is automatically selected by one of * The aliasing port is automatically selected by one of
* two methods below: * two methods below:
*/ */
max_trials = GET_NEW_PORT_MAX_ATTEMPTS; max_trials = GET_NEW_PORT_MAX_ATTEMPTS;
if (la->packetAliasMode & PKT_ALIAS_SAME_PORTS) { if (la->packetAliasMode & PKT_ALIAS_SAME_PORTS) {
donnerUnsubmitted
Done
Inline Actions

So PKT_ALIAS_SAME_PORT is incompatible with port ranges?
Can we prevent setting both flags with an error message in parsing the config?

donner: So PKT_ALIAS_SAME_PORT is incompatible with port ranges? Can we prevent setting both flags with…
/* /*
* When the PKT_ALIAS_SAME_PORTS option is chosen, * When the PKT_ALIAS_SAME_PORTS option is chosen,
* the first try will be the actual source port. If * the first try will be the actual source port. If
* this is already in use, the remainder of the * this is already in use, the remainder of the
* trials will be random. * trials will be random.
*/ */
port_net = lnk->src_port; port_net = lnk->src_port;
port_sys = ntohs(port_net); port_sys = ntohs(port_net);
} else if (la->aliasPortLower && la->aliasPortUpper) {
melifaroUnsubmitted
Done
Inline Actions

Why do we need to check for both lower and upper in fast path?

melifaro: Why do we need to check for both lower and upper in fast path?
/* First trial is a random port in the aliasing range. */
port_sys = la->aliasPortLower + (arc4random() %
(la->aliasPortUpper - la->aliasPortLower));
donnerUnsubmitted
Done
Inline Actions

In terms of performance, it would be interesting to replace "Upper" with a precomputed "Range" or "Length". This part is used for ever new flow (very often).

For printing the configuration, the "Upper" value an be synthesized on demand.

donner: In terms of performance, it would be interesting to replace "Upper" with a precomputed "Range"…
port_net = htons(port_sys);
} else { } else {
/* First trial and all subsequent are random. */ /* First trial and all subsequent are random. */
port_sys = arc4random() & ALIAS_PORT_MASK; port_sys = arc4random() & ALIAS_PORT_MASK;
port_sys += ALIAS_PORT_BASE; port_sys += ALIAS_PORT_BASE;
port_net = htons(port_sys); port_net = htons(port_sys);
} }
} else if (alias_port_param >= 0 && alias_port_param < 0x10000) { } else if (alias_port_param >= 0 && alias_port_param < 0x10000) {
lnk->alias_port = (u_short) alias_port_param; lnk->alias_port = (u_short) alias_port_param;
Show All 37 Lines#ifndef NO_USE_SOCKETS
} else { } else {
#endif #endif
lnk->alias_port = port_net; lnk->alias_port = port_net;
return (0); return (0);
#ifndef NO_USE_SOCKETS #ifndef NO_USE_SOCKETS
} }
#endif #endif
} }
if (la->aliasPortLower && la->aliasPortUpper) {
port_sys = la->aliasPortLower + (arc4random() %
(la->aliasPortUpper - la->aliasPortLower));
port_net = htons(port_sys);
} else {
port_sys = arc4random() & ALIAS_PORT_MASK; port_sys = arc4random() & ALIAS_PORT_MASK;
port_sys += ALIAS_PORT_BASE; port_sys += ALIAS_PORT_BASE;
port_net = htons(port_sys); port_net = htons(port_sys);
} }
}
#ifdef LIBALIAS_DEBUG #ifdef LIBALIAS_DEBUG
fprintf(stderr, "PacketAlias/GetNewPort(): "); fprintf(stderr, "PacketAlias/GetNewPort(): ");
fprintf(stderr, "could not find free port\n"); fprintf(stderr, "could not find free port\n");
#endif #endif
return (-1); return (-1);
} }
▲ Show 20 Lines • Show All 1,765 Lines • ▼ Show 20 Lines
{ {
LIBALIAS_LOCK(la); LIBALIAS_LOCK(la);
if (la->packetAliasMode & PKT_ALIAS_RESET_ON_ADDR_CHANGE if (la->packetAliasMode & PKT_ALIAS_RESET_ON_ADDR_CHANGE
&& la->aliasAddress.s_addr != addr.s_addr) && la->aliasAddress.s_addr != addr.s_addr)
CleanupAliasData(la); CleanupAliasData(la);
la->aliasAddress = addr; la->aliasAddress = addr;
LIBALIAS_UNLOCK(la);
}
void
LibAliasSetAliasPortRange(struct libalias *la, u_short port_low,
u_short port_high)
{
LIBALIAS_LOCK(la);
la->aliasPortLower = port_low;
la->aliasPortUpper = port_high;
LIBALIAS_UNLOCK(la); LIBALIAS_UNLOCK(la);
} }
void void
LibAliasSetTarget(struct libalias *la, struct in_addr target_addr) LibAliasSetTarget(struct libalias *la, struct in_addr target_addr)
{ {
▲ Show 20 Lines • Show All 466 Lines • Show Last 20 Lines