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Added changes to permit pppoe interfaces #38

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@ljpaff ljpaff commented Jul 31, 2018

Workaround for:
Igmpproxy is not starting if upstream interface is a pppoe interface #28

@ljpaff ljpaff closed this Jul 31, 2018
@ljpaff ljpaff reopened this Jul 31, 2018
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@pali pali left a comment

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I have not done review of code yet, just quick look and ...

src/config.c Outdated
@@ -396,7 +396,7 @@ struct SubnetList *parseSubnetAddress(char *addrstr) {
}

tmpSubnet = (struct SubnetList*) malloc(sizeof(struct SubnetList));
tmpSubnet->subnet_addr = addr;
tmpSubnet->subnet_addr = (addr & mask);
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Why is this change needed?

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Because in ifvc.c are now handling subnets on the form addr & mask so it must be changed in order to work properly.

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I just would like to note that this specific change was reverted on pfSense

pfsense/FreeBSD-ports@009d60c

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Ok, so this change must be reverted....

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@ljpaff ljpaff Aug 2, 2018

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You are right, yesterday night i had compiled the source code and tested it. It is working perfectly without this change, and i can confirm that igmpproxy is working with a vlan tagged with pppoe interface.

What are next steps?. Do I cancel this pull request and open another one without config.c change or Do I revert the change in this pull request?

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Please update this pull request. There is no need to create a new one.

@@ -274,6 +281,21 @@ void buildIfVc(void) {
mask = s_addr_from_sockaddr(&IfReq.ifr_addr); // Do not use ifr_netmask as it is not available on freebsd
subnet = addr & mask;

dp = getIfByName(IfPt->ifr_name, 1);
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What is the purpose of function parameter which is always constant?

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It is to be able to take advantage of the function so that it also works in the same way as it did in the past.

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But that function is not called from other places. Such change introduce a dead code as parameter is never false.

@@ -201,8 +201,10 @@ void rebuildIfVc () {
**
*/
void buildIfVc(void) {
struct ifreq IfVc[ sizeof( IfDescVc ) / sizeof( IfDescVc[ 0 ] ) ];
struct ifreq IfVc[ MAX_IF * 2 ]; /* allocate in double in order to get as much information as possible */
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Why *2? Maximal number is maximal. So either defined constant is not so large or there is another hidden problem?

*/
if ( IfPt->ifr_addr.sa_family != AF_INET ) {
my_log(LOG_DEBUG, 0, "Interface is not AF_INET, skipping %s (family %d)", IfPt->ifr_name, IfPt->ifr_addr.sa_family);
continue;
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Skipping interfaces without IPv4 address would mean igmpproxy itself would not see this interface. Why such change is needed? Previously these interfaces was normally processed just marked as non-IPv4.

while (currsubnet->next != NULL)
currsubnet = currsubnet->next;
currsubnet->next = allowednet;
continue;
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This completely skip code which is below. Why?

Looks like this is a hack which just hide the fact that there is a probably bug in code below and try to invisibly skip it. This change is non-intuitive and introduce (potentially) dead code. Also probably may introduce another bugs as parts like IfDescEp++; are not executed...

@fichtner fichtner mentioned this pull request Sep 29, 2018
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pali commented Dec 20, 2022

@ljpaff Could you please address issues above?

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3 participants