diff options
| author | David Ahern <dsahern@gmail.com> | 2018-10-19 12:45:29 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-22 19:33:29 -0700 |
| commit | 5fcd266a9f64bc75707f7ddc96427f2e8caaacd5 (patch) | |
| tree | bb7d61b61e1ed7ecde68be91d03847b420581200 /net | |
| parent | fe884c2be0b329042eaf0371ebdbb636ba3ccc39 (diff) | |
net/ipv4: Add support for dumping addresses for a specific device
If an RTM_GETADDR dump request has ifa_index set in the ifaddrmsg
header, then return only the addresses for that device.
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/devinet.c | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index 67f382c560ba..63d5b58fbfdb 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -109,6 +109,7 @@ struct inet_fill_args { int event; unsigned int flags; int netnsid; + int ifindex; }; #define IN4_ADDR_HSIZE_SHIFT 8 @@ -1663,8 +1664,9 @@ nla_put_failure: static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, struct inet_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; @@ -1679,9 +1681,11 @@ static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request"); return -EINVAL; } - if (ifm->ifa_index) { - NL_SET_ERR_MSG(extack, "ipv4: 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, @@ -1765,9 +1769,22 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) if (cb->strict_check) { err = inet_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; + + in_dev = __in_dev_get_rtnl(dev); + if (in_dev) { + err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx, + &fillargs); + } + goto put_tgt_net; + } } for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { @@ -1800,6 +1817,7 @@ cont: done: cb->args[0] = h; cb->args[1] = idx; +put_tgt_net: if (fillargs.netnsid >= 0) put_net(tgt_net); |