diff options
Diffstat (limited to 'package/network/services/igmpproxy/patches/003-Restrict-igmp-reports-for-downstream-interfaces-wrt-.patch')
| -rw-r--r-- | package/network/services/igmpproxy/patches/003-Restrict-igmp-reports-for-downstream-interfaces-wrt-.patch | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/package/network/services/igmpproxy/patches/003-Restrict-igmp-reports-for-downstream-interfaces-wrt-.patch b/package/network/services/igmpproxy/patches/003-Restrict-igmp-reports-for-downstream-interfaces-wrt-.patch new file mode 100644 index 0000000..90d4d5f --- /dev/null +++ b/package/network/services/igmpproxy/patches/003-Restrict-igmp-reports-for-downstream-interfaces-wrt-.patch @@ -0,0 +1,164 @@ +From 65f777e7f66b55239d935c1cf81bb5abc0f6c89f Mon Sep 17 00:00:00 2001 +From: Grinch <grinch79@users.sourceforge.net> +Date: Sun, 16 Aug 2009 19:58:26 +0500 +Subject: [PATCH] Restrict igmp reports for downstream interfaces (wrt #2833339) + +atm all igmp membership reports are forwarded to the upstream interface. +Unfortunately some ISP Providers restrict some multicast groups (esp. those +that are defined as local link groups and that are not supposed to be +forwarded to the wan, i.e 224.0.0.0/24). Therefore there should be some +kind of black oder whitelisting. +As whitelisting can be accomplished quite easy I wrote a litte patch, which +is attached to this request. +--- + doc/igmpproxy.conf.5.in | 19 +++++++++++++++++++ + src/config.c | 23 ++++++++++++++++++++++- + src/igmpproxy.h | 1 + + src/request.c | 20 ++++++++++++++++---- + 4 files changed, 58 insertions(+), 5 deletions(-) + +diff --git a/doc/igmpproxy.conf.5.in b/doc/igmpproxy.conf.5.in +index a4ea7d0..56efa22 100644 +--- a/doc/igmpproxy.conf.5.in ++++ b/doc/igmpproxy.conf.5.in +@@ -116,6 +116,25 @@ This is especially useful for the upstream interface, since the source for multi + traffic is often from a remote location. Any number of altnet parameters can be specified. + .RE + ++.B whitelist ++.I networkaddr ++.RS ++Defines a whitelist for multicast groups. The network address must be in the following ++format 'a.b.c.d/n'. If you want to allow one single group use a network mask of /32, ++i.e. 'a.b.c.d/32'. ++ ++By default all multicast groups are allowed on any downstream interface. If at least one ++whitelist entry is defined, all igmp membership reports for not explicitly whitelisted ++multicast groups will be ignored and therefore not be served by igmpproxy. This is especially ++useful, if your provider does only allow a predefined set of multicast groups. These whitelists ++are only obeyed by igmpproxy itself, they won't prevent any other igmp client running on the ++same machine as igmpproxy from requesting 'unallowed' multicast groups. ++ ++You may specify as many whitelist entries as needed. Although you should keep it as simple as ++possible, as this list is parsed for every membership report and therefore this increases igmp ++response times. Often used or large groups should be defined first, as parsing ends as soon as ++a group matches an entry. ++.RE + + .SH EXAMPLE + ## Enable quickleave +diff --git a/src/config.c b/src/config.c +index 5a96ce0..d72619f 100644 +--- a/src/config.c ++++ b/src/config.c +@@ -46,6 +46,9 @@ struct vifconfig { + + // Keep allowed nets for VIF. + struct SubnetList* allowednets; ++ ++ // Allowed Groups ++ struct SubnetList* allowedgroups; + + // Next config in list... + struct vifconfig* next; +@@ -202,6 +205,8 @@ void configureVifs() { + // Insert the configured nets... + vifLast->next = confPtr->allowednets; + ++ Dp->allowedgroups = confPtr->allowedgroups; ++ + break; + } + } +@@ -215,7 +220,7 @@ void configureVifs() { + */ + struct vifconfig *parsePhyintToken() { + struct vifconfig *tmpPtr; +- struct SubnetList **anetPtr; ++ struct SubnetList **anetPtr, **agrpPtr; + char *token; + short parseError = 0; + +@@ -239,6 +244,7 @@ struct vifconfig *parsePhyintToken() { + tmpPtr->threshold = 1; + tmpPtr->state = IF_STATE_DOWNSTREAM; + tmpPtr->allowednets = NULL; ++ tmpPtr->allowedgroups = NULL; + + // Make a copy of the token to store the IF name + tmpPtr->name = strdup( token ); +@@ -248,6 +254,7 @@ struct vifconfig *parsePhyintToken() { + + // Set the altnet pointer to the allowednets pointer. + anetPtr = &tmpPtr->allowednets; ++ agrpPtr = &tmpPtr->allowedgroups; + + // Parse the rest of the config.. + token = nextConfigToken(); +@@ -266,6 +273,20 @@ struct vifconfig *parsePhyintToken() { + anetPtr = &(*anetPtr)->next; + } + } ++ else if(strcmp("whitelist", token)==0) { ++ // Whitelist ++ token = nextConfigToken(); ++ my_log(LOG_DEBUG, 0, "Config: IF: Got whitelist token %s.", token); ++ ++ *agrpPtr = parseSubnetAddress(token); ++ if(*agrpPtr == NULL) { ++ parseError = 1; ++ my_log(LOG_WARNING, 0, "Unable to parse subnet address."); ++ break; ++ } else { ++ agrpPtr = &(*agrpPtr)->next; ++ } ++ } + else if(strcmp("upstream", token)==0) { + // Upstream + my_log(LOG_DEBUG, 0, "Config: IF: Got upstream token."); +diff --git a/src/igmpproxy.h b/src/igmpproxy.h +index 4dabd1c..0de7791 100644 +--- a/src/igmpproxy.h ++++ b/src/igmpproxy.h +@@ -145,6 +145,7 @@ struct IfDesc { + short Flags; + short state; + struct SubnetList* allowednets; ++ struct SubnetList* allowedgroups; + unsigned int robustness; + unsigned char threshold; /* ttl limit */ + unsigned int ratelimit; +diff --git a/src/request.c b/src/request.c +index e3589f6..89b91de 100644 +--- a/src/request.c ++++ b/src/request.c +@@ -82,10 +82,22 @@ void acceptGroupReport(uint32_t src, uint32_t group, uint8_t type) { + my_log(LOG_DEBUG, 0, "Should insert group %s (from: %s) to route table. Vif Ix : %d", + inetFmt(group,s1), inetFmt(src,s2), sourceVif->index); + +- // The membership report was OK... Insert it into the route table.. +- insertRoute(group, sourceVif->index); +- +- ++ // If we don't have a whitelist we insertRoute and done ++ if(sourceVif->allowedgroups == NULL) ++ { ++ insertRoute(group, sourceVif->index); ++ return; ++ } ++ // Check if this Request is legit on this interface ++ struct SubnetList *sn; ++ for(sn = sourceVif->allowedgroups; sn != NULL; sn = sn->next) ++ if((group & sn->subnet_mask) == sn->subnet_addr) ++ { ++ // The membership report was OK... Insert it into the route table.. ++ insertRoute(group, sourceVif->index); ++ return; ++ } ++ my_log(LOG_INFO, 0, "The group address %s may not be requested from this interface. Ignoring.", inetFmt(group, s1)); + } else { + // Log the state of the interface the report was recieved on. + my_log(LOG_INFO, 0, "Mebership report was recieved on %s. Ignoring.", +-- +1.7.2.5 + |