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Back out part of the revision 1.2 changes -- sendto(2) can

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not return ENOBUFS for unreliable protocols like divert.

This should fix an issue when natd(8) keeps spamming already
full dummynet(4) queues with the same packet forever.

Spotted by:	chkno@dork.com
Explained by:	luigi
Reviewed by:	Ari Suutari <ari.suutari@syncrontech.com>
MFC after:	2 weeks
This commit is contained in:
Ruslan Ermilov 2002-01-15 17:07:56 +00:00
parent 9d0fef6b8d
commit 3daff2423f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=89396
1 changed files with 28 additions and 73 deletions
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101
sbin/natd/natd.c
View file

@ -97,7 +97,6 @@ static int StrToPortRange (const char* str, const char* proto, port_range *
static int StrToProto (const char* str);
static int StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto, port_range *portRange);
static void ParseArgs (int argc, char** argv);
static void FlushPacketBuffer (int fd);
static void SetupPunchFW(const char *strValue);
/*
@ -118,11 +117,6 @@ static int dynamicMode;
static int ifMTU;
static int aliasOverhead;
static int icmpSock;
static char packetBuf[IP_MAXPACKET];
static int packetLen;
static struct sockaddr_in packetAddr;
static int packetSock;
static int packetDirection;
static int dropIgnoredIncoming;
static int logDropped;
static int logFacility;
@ -136,7 +130,6 @@ int main (int argc, char** argv)
int routeSock;
struct sockaddr_in addr;
fd_set readMask;
fd_set writeMask;
int fdMax;
/*
* Initialize packet aliasing software.
@ -162,11 +155,6 @@ int main (int argc, char** argv)
logDropped = 0;
logFacility = LOG_DAEMON;
logIpfwDenied = -1;
/*
* Mark packet buffer empty.
*/
packetSock = -1;
packetDirection = DONT_KNOW;
ParseArgs (argc, argv);
/*
@ -330,7 +318,7 @@ int main (int argc, char** argv)
while (running) {
if (divertInOut != -1 && !ifName && packetSock == -1) {
if (divertInOut != -1 && !ifName) {
/*
* When using only one socket, just call
* DoAliasing repeatedly to process packets.
@ -342,30 +330,17 @@ int main (int argc, char** argv)
* Build read mask from socket descriptors to select.
*/
FD_ZERO (&readMask);
FD_ZERO (&writeMask);
/*
* If there is unsent packet in buffer, use select
* to check when socket comes writable again.
* Check if new packets are available.
*/
if (packetSock != -1) {
if (divertIn != -1)
FD_SET (divertIn, &readMask);
FD_SET (packetSock, &writeMask);
}
else {
/*
* No unsent packet exists - safe to check if
* new ones are available.
*/
if (divertIn != -1)
FD_SET (divertIn, &readMask);
if (divertOut != -1)
FD_SET (divertOut, &readMask);
if (divertOut != -1)
FD_SET (divertOut, &readMask);
if (divertInOut != -1)
FD_SET (divertInOut, &readMask);
}
if (divertInOut != -1)
FD_SET (divertInOut, &readMask);
/*
* Routing info is processed always.
*/
@ -374,7 +349,7 @@ int main (int argc, char** argv)
if (select (fdMax + 1,
&readMask,
&writeMask,
NULL,
NULL,
NULL) == -1) {
@ -384,10 +359,6 @@ int main (int argc, char** argv)
Quit ("Select failed.");
}
if (packetSock != -1)
if (FD_ISSET (packetSock, &writeMask))
FlushPacketBuffer (packetSock);
if (divertIn != -1)
if (FD_ISSET (divertIn, &readMask))
DoAliasing (divertIn, INPUT);
@ -470,9 +441,13 @@ static void DoAliasing (int fd, int direction)
{
int bytes;
int origBytes;
char buf[IP_MAXPACKET];
struct sockaddr_in addr;
int wrote;
int status;
int addrSize;
struct ip* ip;
char msgBuf[80];
if (assignAliasAddr) {
@ -482,12 +457,12 @@ static void DoAliasing (int fd, int direction)
/*
* Get packet from socket.
*/
addrSize = sizeof packetAddr;
addrSize = sizeof addr;
origBytes = recvfrom (fd,
packetBuf,
sizeof packetBuf,
buf,
sizeof buf,
0,
(struct sockaddr*) &packetAddr,
(struct sockaddr*) &addr,
&addrSize);
if (origBytes == -1) {
@ -500,9 +475,9 @@ static void DoAliasing (int fd, int direction)
/*
* This is a IP packet.
*/
ip = (struct ip*) packetBuf;
ip = (struct ip*) buf;
if (direction == DONT_KNOW) {
if (packetAddr.sin_addr.s_addr == INADDR_ANY)
if (addr.sin_addr.s_addr == INADDR_ANY)
direction = OUTPUT;
else
direction = INPUT;
@ -541,14 +516,14 @@ static void DoAliasing (int fd, int direction)
/*
* Outgoing packets. Do aliasing.
*/
PacketAliasOut (packetBuf, IP_MAXPACKET);
PacketAliasOut (buf, IP_MAXPACKET);
}
else {
/*
* Do aliasing.
*/
status = PacketAliasIn (packetBuf, IP_MAXPACKET);
status = PacketAliasIn (buf, IP_MAXPACKET);
if (status == PKT_ALIAS_IGNORED &&
dropIgnoredIncoming) {
@ -583,42 +558,24 @@ static void DoAliasing (int fd, int direction)
printf ("\n");
}
packetLen = bytes;
packetSock = fd;
packetDirection = direction;
FlushPacketBuffer (fd);
}
static void FlushPacketBuffer (int fd)
{
int wrote;
char msgBuf[80];
/*
* Put packet back for processing.
*/
wrote = sendto (fd,
packetBuf,
packetLen,
buf,
bytes,
0,
(struct sockaddr*) &packetAddr,
sizeof packetAddr);
(struct sockaddr*) &addr,
sizeof addr);
if (wrote != packetLen) {
/*
* If buffer space is not available,
* just return. Main loop will take care of
* retrying send when space becomes available.
*/
if (errno == ENOBUFS)
return;
if (wrote != bytes) {
if (errno == EMSGSIZE) {
if (packetDirection == OUTPUT &&
if (direction == OUTPUT &&
ifMTU != -1)
SendNeedFragIcmp (icmpSock,
(struct ip*) packetBuf,
(struct ip*) buf,
ifMTU - aliasOverhead);
}
else if (errno == EACCES && logIpfwDenied) {
@ -627,8 +584,6 @@ static void FlushPacketBuffer (int fd)
Warn (msgBuf);
}
}
packetSock = -1;
}
static void HandleRoutingInfo (int fd)