Hi,
2020年8月6日(木) 23:03 David Ahern <dsah...@gmail.com>:
>
> On 8/6/20 2:55 AM, Xin Long wrote:
> > On Thu, Aug 6, 2020 at 10:50 AM Hideaki Yoshifuji
> > <hideaki.yoshif...@miraclelinux.com> wrote:
> >>
> >> Hi,
> >>
> >> 2020年8月4日(火) 0:35 Xin Long <lucien....@gmail.com>:
> >>>
> >>> This is to add an ip_dev_find like function for ipv6, used to find
> >>> the dev by saddr.
> >>>
> >>> It will be used by TIPC protocol. So also export it.
> >>>
> >>> Signed-off-by: Xin Long <lucien....@gmail.com>
> >>> ---
> >>> include/net/addrconf.h | 2 ++
> >>> net/ipv6/addrconf.c | 39 +++++++++++++++++++++++++++++++++++++++
> >>> 2 files changed, 41 insertions(+)
> >>>
> >>> diff --git a/include/net/addrconf.h b/include/net/addrconf.h
> >>> index 8418b7d..ba3f6c15 100644
> >>> --- a/include/net/addrconf.h
> >>> +++ b/include/net/addrconf.h
> >>> @@ -97,6 +97,8 @@ bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
> >>>
> >>> int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
> >>>
> >>> +struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr
> >>> *addr);
> >>> +
> >>
> >> How do we handle link-local addresses?
> > This is what "if (!result)" branch meant to do:
> >
> > + if (!result) {
> > + struct rt6_info *rt;
> > +
> > + rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
> > + if (rt) {
> > + dev = rt->dst.dev;
> > + ip6_rt_put(rt);
> > + }
> > + } else {
> > + dev = result->idev->dev;
> > + }
> >
>
> the stated purpose of this function is to find the netdevice to which an
> address is attached. A route lookup should not be needed. Walking the
> address hash list finds the address and hence the netdev or it does not.
>
>
User supplied scope id which should be set for link-local addresses
in TIPC_NLA_UDP_LOCAL attribute must be honored when we
check the address.
ipv6_chk_addr() can check if the address and supplied ifindex is a valid
local address. Or introduce an extra ifindex argument to ipv6_dev_find().
--yoshfuji
