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net/ipv6: Add support for dumping addresses for a specific device

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If an RTM_GETADDR dump request has ifa_index set in the ifaddrmsg
header, then return only the addresses for that device.

Since inet6_dump_addr is reused for multicast and anycast addresses,
this adds support for device specfic dumps of RTM_GETMULTICAST and
RTM_GETANYCAST as well.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-10-19 12:45:30 -07:00 committed by David S. Miller
parent 5fcd266a9f
commit 6371a71f3a
1 changed files with 22 additions and 5 deletions
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27
net/ipv6/addrconf.c
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@ -4821,6 +4821,7 @@ struct inet6_fill_args {
int event;
unsigned int flags;
int netnsid;
int ifindex;
enum addr_type_t type;
};
@ -5018,8 +5019,9 @@ next:
static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
struct inet6_fill_args *fillargs,
struct net **tgt_net, struct sock *sk,
struct netlink_ext_ack *extack)
struct netlink_callback *cb)
{
struct netlink_ext_ack *extack = cb->extack;
struct nlattr *tb[IFA_MAX+1];
struct ifaddrmsg *ifm;
int err, i;
@ -5034,9 +5036,11 @@ static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
return -EINVAL;
}
if (ifm->ifa_index) {
NL_SET_ERR_MSG_MOD(extack, "Filter by device index not supported for address dump");
return -EINVAL;
fillargs->ifindex = ifm->ifa_index;
if (fillargs->ifindex) {
cb->answer_flags |= NLM_F_DUMP_FILTERED;
fillargs->flags |= NLM_F_DUMP_FILTERED;
}
err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
@ -5094,9 +5098,21 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
int err;
err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
skb->sk, cb->extack);
skb->sk, cb);
if (err < 0)
return err;
if (fillargs.ifindex) {
dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
if (!dev)
return -ENODEV;
idev = __in6_dev_get(dev);
if (idev) {
err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
&fillargs);
}
goto put_tgt_net;
}
}
rcu_read_lock();
@ -5124,6 +5140,7 @@ done:
rcu_read_unlock();
cb->args[0] = h;
cb->args[1] = idx;
put_tgt_net:
if (fillargs.netnsid >= 0)
put_net(tgt_net);