diff options
Diffstat (limited to 'net/ipv4/devinet.c')
| -rw-r--r-- | net/ipv4/devinet.c | 85 |
1 files changed, 63 insertions, 22 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index d122ebbe5980..a34602ae27de 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, @@ -1700,6 +1704,7 @@ static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); if (IS_ERR(net)) { + fillargs->netnsid = -1; NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id"); return PTR_ERR(net); } @@ -1713,6 +1718,32 @@ static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, return 0; } +static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb, + struct netlink_callback *cb, int s_ip_idx, + struct inet_fill_args *fillargs) +{ + struct in_ifaddr *ifa; + int ip_idx = 0; + int err; + + for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next, ip_idx++) { + if (ip_idx < s_ip_idx) + continue; + + err = inet_fill_ifaddr(skb, ifa, fillargs); + if (err < 0) + goto done; + + nl_dump_check_consistent(cb, nlmsg_hdr(skb)); + } + err = 0; + +done: + cb->args[2] = ip_idx; + + return err; +} + static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) { const struct nlmsghdr *nlh = cb->nlh; @@ -1727,23 +1758,37 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) struct net *tgt_net = net; int h, s_h; int idx, s_idx; - int ip_idx, s_ip_idx; + int s_ip_idx; struct net_device *dev; struct in_device *in_dev; - struct in_ifaddr *ifa; struct hlist_head *head; + int err = 0; s_h = cb->args[0]; s_idx = idx = cb->args[1]; - s_ip_idx = ip_idx = cb->args[2]; + s_ip_idx = cb->args[2]; if (cb->strict_check) { - int err; - err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, - skb->sk, cb->extack); + skb->sk, cb); if (err < 0) - return err; + goto put_tgt_net; + + err = 0; + if (fillargs.ifindex) { + dev = __dev_get_by_index(tgt_net, fillargs.ifindex); + if (!dev) { + err = -ENODEV; + goto put_tgt_net; + } + + 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) { @@ -1761,15 +1806,11 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) if (!in_dev) goto cont; - for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; - ifa = ifa->ifa_next, ip_idx++) { - if (ip_idx < s_ip_idx) - continue; - if (inet_fill_ifaddr(skb, ifa, &fillargs) < 0) { - rcu_read_unlock(); - goto done; - } - nl_dump_check_consistent(cb, nlmsg_hdr(skb)); + err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx, + &fillargs); + if (err < 0) { + rcu_read_unlock(); + goto done; } cont: idx++; @@ -1780,11 +1821,11 @@ cont: done: cb->args[0] = h; cb->args[1] = idx; - cb->args[2] = ip_idx; +put_tgt_net: if (fillargs.netnsid >= 0) put_net(tgt_net); - return skb->len; + return err < 0 ? err : skb->len; } static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
