On Thu, Aug 6, 2020 at 10:50 AM Hideaki Yoshifuji
<[email protected]> wrote:
>
> Hi,
>
> 2020年8月4日(火) 0:35 Xin Long <[email protected]>:
> >
> > 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 <[email protected]>
> > ---
> > 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;
+ }
Thanks.
>
> --yoshfuji
>
> > struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
> > const struct in6_addr *addr,
> > struct net_device *dev, int strict);
> > diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> > index 840bfdb..857d6f9 100644
> > --- a/net/ipv6/addrconf.c
> > +++ b/net/ipv6/addrconf.c
> > @@ -1983,6 +1983,45 @@ int ipv6_chk_prefix(const struct in6_addr *addr,
> > struct net_device *dev)
> > }
> > EXPORT_SYMBOL(ipv6_chk_prefix);
> >
> > +/**
> > + * ipv6_dev_find - find the first device with a given source address.
> > + * @net: the net namespace
> > + * @addr: the source address
> > + *
> > + * The caller should be protected by RCU, or RTNL.
> > + */
> > +struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr
> > *addr)
> > +{
> > + unsigned int hash = inet6_addr_hash(net, addr);
> > + struct inet6_ifaddr *ifp, *result = NULL;
> > + struct net_device *dev = NULL;
> > +
> > + rcu_read_lock();
> > + hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
> > + if (net_eq(dev_net(ifp->idev->dev), net) &&
> > + ipv6_addr_equal(&ifp->addr, addr)) {
> > + result = ifp;
> > + break;
> > + }
> > + }
> > +
> > + 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;
> > + }
> > + rcu_read_unlock();
> > +
> > + return dev;
> > +}
> > +EXPORT_SYMBOL(ipv6_dev_find);
> > +
> > struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct
> > in6_addr *addr,
> > struct net_device *dev, int strict)
> > {
> > --
> > 2.1.0
> >
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