Fri, Jan 22, 2016 at 04:49:36PM CET, [email protected] wrote: >On Fri, 2016-01-22 at 16:05 +0100, Jiri Pirko wrote: >> Fri, Jan 22, 2016 at 03:51:55PM CET, [email protected] wrote: >> >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. >> >> dev->dev_addr is notified by that. UC addresses do not have any >> notification now. >It is the multicast MAC address (ie the multicast equivalent of the >dev_addr) that we are notifying here right? Not L3 addresses.
I know :) For example if kernel code calls dev_uc_add or dev_uc_del, thise addresses are not notified to the userspace. All I'm saying is, if you add notification for dev_mc_add and dev_mc_del, add it for uc variants as well. Then you have to distinguish mc and uc in the netlink message. > >-pr >
