On Thu, 2016-01-21 at 21:04 +0100, Jiri Pirko wrote: > Thu, Jan 21, 2016 at 12:47:54PM CET, [email protected] wrote: > >Add RTM_NEWADDR and RTM_DELADDR netlink messages to indicate > >interest in specific multicast hardware addresses. These messages > >are sent when addressed are added or deleted from the appropriate > >interface driver. > > > >Signed-off-by: Patrick Ruddy <[email protected]> > > > >diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c > >index c0548d2..a0ebadd 100644 > >--- a/net/core/dev_addr_lists.c > >+++ b/net/core/dev_addr_lists.c > >@@ -12,6 +12,7 @@ > > */ > > > > #include <linux/netdevice.h> > >+#include <net/netlink.h> > > #include <linux/rtnetlink.h> > > #include <linux/export.h> > > #include <linux/list.h> > >@@ -661,6 +662,62 @@ out: > > } > > EXPORT_SYMBOL(dev_mc_add_excl); > > > >+static int fill_addr(struct sk_buff *skb, struct net_device *dev, > >+ const unsigned char *addr, int type) > >+{ > >+ struct nlmsghdr *nlh; > >+ struct ifaddrmsg *ifm; > >+ > >+ nlh = nlmsg_put(skb, 0, 0, type, sizeof(*ifm), 0); > >+ if (nlh == NULL) > >+ return -EMSGSIZE; > >+ > >+ ifm = nlmsg_data(nlh); > >+ ifm->ifa_family = AF_UNSPEC; > >+ ifm->ifa_prefixlen = 0; > >+ ifm->ifa_flags = IFA_F_PERMANENT; > >+ ifm->ifa_scope = RT_SCOPE_LINK; > >+ ifm->ifa_index = dev->ifindex; > >+ if (nla_put(skb, IFA_ADDRESS, dev->addr_len, addr)) > >+ goto nla_put_failure; > >+ nlmsg_end(skb, nlh); > > How can userspace tell if this is a multicast addr? Also, why not add > notifications for unicast addrs so we handle both the same?
I am only using this RTM_NEW/DELADDR AF_UNSPEC message for multicast addresses. I understand that the unicast addresses are notified in the RTM_NEW/DELLINK. -pr
