From: Nick Podolak <nicholas.podo...@dtechlabs.com>
This patch set allows for interfaces defined in UCI to enable and disable
multicast support on their underlying device. This has particular use on GRE
tunnels which previously did NOT enable multicast by default. Since GRE is
commonly used to create router to router links that support multicast for use
by routing protocols (e.g. OSPF, EIGRP, etc), or specifically for multicast
applications, this modification seemed necessary.
This first patch adds the multicast capability to all interfaces/devices.
Signed-off-by: Nick Podolak <nicholas.podo...@dtechlabs.com>
Index: netifd-2015-09-27/device.c
===================================================================
--- netifd-2015-09-27.orig/device.c 2015-10-13 15:21:54.358124119 -0400
+++ netifd-2015-09-27/device.c 2015-10-13 15:21:54.346124119 -0400
@@ -40,6 +40,7 @@
[DEV_ATTR_ENABLED] = { .name = "enabled", .type = BLOBMSG_TYPE_BOOL },
[DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
[DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
+ [DEV_ATTR_MULTICAST] = { .name = "multicast", .type = BLOBMSG_TYPE_BOOL },
[DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
[DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type =
BLOBMSG_TYPE_BOOL },
[DEV_ATTR_IGMPVERSION] = { .name = "igmpversion", .type =
BLOBMSG_TYPE_INT32 },
@@ -162,6 +163,7 @@
sizeof(n->macaddr));
n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
+ n->multicast = s->flags & DEV_OPT_MULTICAST ? s->multicast : os->multicast;
n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal :
os->acceptlocal;
n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion :
os->igmpversion;
@@ -222,6 +224,11 @@
s->flags |= DEV_OPT_PROMISC;
}
+ if ((cur = tb[DEV_ATTR_MULTICAST])) {
+ s->multicast = blobmsg_get_bool(cur);
+ s->flags |= DEV_OPT_MULTICAST;
+ }
+
if ((cur = tb[DEV_ATTR_RPFILTER])) {
if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
s->flags |= DEV_OPT_RPFILTER;
@@ -899,6 +906,8 @@
blobmsg_add_u8(b, "ipv6", st.ipv6);
if (st.flags & DEV_OPT_PROMISC)
blobmsg_add_u8(b, "promisc", st.promisc);
+ if (st.flags & DEV_OPT_MULTICAST)
+ blobmsg_add_u8(b, "multicast", st.multicast);
if (st.flags & DEV_OPT_RPFILTER)
blobmsg_add_u32(b, "rpfilter", st.rpfilter);
if (st.flags & DEV_OPT_ACCEPTLOCAL)
Index: netifd-2015-09-27/system-linux.c
===================================================================
--- netifd-2015-09-27.orig/system-linux.c 2015-10-13 15:21:54.358124119 -0400
+++ netifd-2015-09-27/system-linux.c 2015-10-13 15:21:54.350124119 -0400
@@ -1091,6 +1091,11 @@
s->flags |= DEV_OPT_PROMISC;
}
+ if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) == 0) {
+ s->multicast = ifr.ifr_flags & IFF_MULTICAST;
+ s->flags |= DEV_OPT_MULTICAST;
+ }
+
if (!system_get_rpfilter(dev, buf, sizeof(buf))) {
s->rpfilter = strtoul(buf, NULL, 0);
s->flags |= DEV_OPT_RPFILTER;
@@ -1193,6 +1198,11 @@
!s->promisc ? IFF_PROMISC : 0) < 0)
s->flags &= ~DEV_OPT_PROMISC;
}
+ if (s->flags & DEV_OPT_MULTICAST & apply_mask) {
+ if (system_if_flags(dev->ifname, s->multicast ? IFF_MULTICAST : 0,
+ !s->multicast ? IFF_MULTICAST : 0) < 0)
+ s->flags &= ~DEV_OPT_MULTICAST;
+ }
if (s->flags & DEV_OPT_RPFILTER & apply_mask) {
snprintf(buf, sizeof(buf), "%d", s->rpfilter);
system_set_rpfilter(dev, buf);
Index: netifd-2015-09-27/device.h
===================================================================
--- netifd-2015-09-27.orig/device.h 2015-10-13 15:21:54.358124119 -0400
+++ netifd-2015-09-27/device.h 2015-10-13 15:21:54.350124119 -0400
@@ -34,6 +34,7 @@
DEV_ATTR_ENABLED,
DEV_ATTR_IPV6,
DEV_ATTR_PROMISC,
+ DEV_ATTR_MULTICAST,
DEV_ATTR_RPFILTER,
DEV_ATTR_ACCEPTLOCAL,
DEV_ATTR_IGMPVERSION,
@@ -88,6 +89,7 @@
DEV_OPT_DADTRANSMITS = (1 << 13),
DEV_OPT_MULTICAST_TO_UNICAST = (1 << 14),
DEV_OPT_MULTICAST_ROUTER = (1 << 15),
+ DEV_OPT_MULTICAST = (1 << 16),
};
/* events broadcasted to all users of a device */
@@ -136,6 +138,7 @@
uint8_t macaddr[6];
bool ipv6;
bool promisc;
+ bool multicast;
unsigned int rpfilter;
bool acceptlocal;
unsigned int igmpversion;
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