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?
--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
>
