Re: [PATCH net-next 1/1] rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK

From: Christian Brauner
Date: Tue Jan 30 2018 - 11:26:24 EST

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Next in thread: David Miller: "Re: [PATCH net-next 1/1] rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK"
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On Wed, Jan 31, 2018 at 12:13:11AM +0800, kbuild test robot wrote:
> Hi Christian,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on net-next/master]
>
> url: https://github.com/0day-ci/linux/commits/Christian-Brauner/rtnetlink-enable-IFLA_IF_NETNSID-for-RTM_NEWLINK/20180130-230918
> config: i386-randconfig-a1-201804 (attached as .config)
> compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
> reproduce:
> # save the attached .config to linux build tree
> make ARCH=i386
>
> All errors (new ones prefixed by >>):
>
> net/core/rtnetlink.c: In function 'rtnl_newlink':
> >> net/core/rtnetlink.c:2903:3: error: implicit declaration of function 'rtnl_link_get_net_capable' [-Werror=implicit-function-declaration]
> dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
> ^

The patch is against Dave's net-next tree which already contains a
merged prior patch series from me which introduces the missing
function. So I'd say this is safe to ignore.

Thanks!
Christian

> net/core/rtnetlink.c:2903:12: warning: assignment makes pointer from integer without a cast
> dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
> ^
> cc1: some warnings being treated as errors
>
> vim +/rtnl_link_get_net_capable +2903 net/core/rtnetlink.c
>
> 2729
> 2730 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
> 2731 struct netlink_ext_ack *extack)
> 2732 {
> 2733 struct net *net = sock_net(skb->sk);
> 2734 const struct rtnl_link_ops *ops;
> 2735 const struct rtnl_link_ops *m_ops = NULL;
> 2736 struct net_device *dev;
> 2737 struct net_device *master_dev = NULL;
> 2738 struct ifinfomsg *ifm;
> 2739 char kind[MODULE_NAME_LEN];
> 2740 char ifname[IFNAMSIZ];
> 2741 struct nlattr *tb[IFLA_MAX+1];
> 2742 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
> 2743 unsigned char name_assign_type = NET_NAME_USER;
> 2744 int err;
> 2745
> 2746 #ifdef CONFIG_MODULES
> 2747 replay:
> 2748 #endif
> 2749 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
> 2750 if (err < 0)
> 2751 return err;
> 2752
> 2753 if (tb[IFLA_IF_NETNSID])
> 2754 return -EOPNOTSUPP;
> 2755
> 2756 if (tb[IFLA_IFNAME])
> 2757 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
> 2758 else
> 2759 ifname[0] = '\0';
> 2760
> 2761 ifm = nlmsg_data(nlh);
> 2762 if (ifm->ifi_index > 0)
> 2763 dev = __dev_get_by_index(net, ifm->ifi_index);
> 2764 else {
> 2765 if (ifname[0])
> 2766 dev = __dev_get_by_name(net, ifname);
> 2767 else
> 2768 dev = NULL;
> 2769 }
> 2770
> 2771 if (dev) {
> 2772 master_dev = netdev_master_upper_dev_get(dev);
> 2773 if (master_dev)
> 2774 m_ops = master_dev->rtnl_link_ops;
> 2775 }
> 2776
> 2777 err = validate_linkmsg(dev, tb);
> 2778 if (err < 0)
> 2779 return err;
> 2780
> 2781 if (tb[IFLA_LINKINFO]) {
> 2782 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
> 2783 tb[IFLA_LINKINFO], ifla_info_policy,
> 2784 NULL);
> 2785 if (err < 0)
> 2786 return err;
> 2787 } else
> 2788 memset(linkinfo, 0, sizeof(linkinfo));
> 2789
> 2790 if (linkinfo[IFLA_INFO_KIND]) {
> 2791 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
> 2792 ops = rtnl_link_ops_get(kind);
> 2793 } else {
> 2794 kind[0] = '\0';
> 2795 ops = NULL;
> 2796 }
> 2797
> 2798 if (1) {
> 2799 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
> 2800 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
> 2801 struct nlattr **data = NULL;
> 2802 struct nlattr **slave_data = NULL;
> 2803 struct net *dest_net, *link_net = NULL;
> 2804
> 2805 if (ops) {
> 2806 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
> 2807 err = nla_parse_nested(attr, ops->maxtype,
> 2808 linkinfo[IFLA_INFO_DATA],
> 2809 ops->policy, NULL);
> 2810 if (err < 0)
> 2811 return err;
> 2812 data = attr;
> 2813 }
> 2814 if (ops->validate) {
> 2815 err = ops->validate(tb, data, extack);
> 2816 if (err < 0)
> 2817 return err;
> 2818 }
> 2819 }
> 2820
> 2821 if (m_ops) {
> 2822 if (m_ops->slave_maxtype &&
> 2823 linkinfo[IFLA_INFO_SLAVE_DATA]) {
> 2824 err = nla_parse_nested(slave_attr,
> 2825 m_ops->slave_maxtype,
> 2826 linkinfo[IFLA_INFO_SLAVE_DATA],
> 2827 m_ops->slave_policy,
> 2828 NULL);
> 2829 if (err < 0)
> 2830 return err;
> 2831 slave_data = slave_attr;
> 2832 }
> 2833 }
> 2834
> 2835 if (dev) {
> 2836 int status = 0;
> 2837
> 2838 if (nlh->nlmsg_flags & NLM_F_EXCL)
> 2839 return -EEXIST;
> 2840 if (nlh->nlmsg_flags & NLM_F_REPLACE)
> 2841 return -EOPNOTSUPP;
> 2842
> 2843 if (linkinfo[IFLA_INFO_DATA]) {
> 2844 if (!ops || ops != dev->rtnl_link_ops ||
> 2845 !ops->changelink)
> 2846 return -EOPNOTSUPP;
> 2847
> 2848 err = ops->changelink(dev, tb, data, extack);
> 2849 if (err < 0)
> 2850 return err;
> 2851 status |= DO_SETLINK_NOTIFY;
> 2852 }
> 2853
> 2854 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
> 2855 if (!m_ops || !m_ops->slave_changelink)
> 2856 return -EOPNOTSUPP;
> 2857
> 2858 err = m_ops->slave_changelink(master_dev, dev,
> 2859 tb, slave_data,
> 2860 extack);
> 2861 if (err < 0)
> 2862 return err;
> 2863 status |= DO_SETLINK_NOTIFY;
> 2864 }
> 2865
> 2866 return do_setlink(skb, dev, ifm, extack, tb, ifname,
> 2867 status);
> 2868 }
> 2869
> 2870 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
> 2871 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
> 2872 return rtnl_group_changelink(skb, net,
> 2873 nla_get_u32(tb[IFLA_GROUP]),
> 2874 ifm, extack, tb);
> 2875 return -ENODEV;
> 2876 }
> 2877
> 2878 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
> 2879 return -EOPNOTSUPP;
> 2880
> 2881 if (!ops) {
> 2882 #ifdef CONFIG_MODULES
> 2883 if (kind[0]) {
> 2884 __rtnl_unlock();
> 2885 request_module("rtnl-link-%s", kind);
> 2886 rtnl_lock();
> 2887 ops = rtnl_link_ops_get(kind);
> 2888 if (ops)
> 2889 goto replay;
> 2890 }
> 2891 #endif
> 2892 return -EOPNOTSUPP;
> 2893 }
> 2894
> 2895 if (!ops->setup)
> 2896 return -EOPNOTSUPP;
> 2897
> 2898 if (!ifname[0]) {
> 2899 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
> 2900 name_assign_type = NET_NAME_ENUM;
> 2901 }
> 2902
> > 2903 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
> 2904 if (IS_ERR(dest_net))
> 2905 return PTR_ERR(dest_net);
> 2906
> 2907 if (tb[IFLA_LINK_NETNSID]) {
> 2908 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
> 2909
> 2910 link_net = get_net_ns_by_id(dest_net, id);
> 2911 if (!link_net) {
> 2912 err = -EINVAL;
> 2913 goto out;
> 2914 }
> 2915 err = -EPERM;
> 2916 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
> 2917 goto out;
> 2918 }
> 2919
> 2920 dev = rtnl_create_link(link_net ? : dest_net, ifname,
> 2921 name_assign_type, ops, tb);
> 2922 if (IS_ERR(dev)) {
> 2923 err = PTR_ERR(dev);
> 2924 goto out;
> 2925 }
> 2926
> 2927 dev->ifindex = ifm->ifi_index;
> 2928
> 2929 if (ops->newlink) {
> 2930 err = ops->newlink(link_net ? : net, dev, tb, data,
> 2931 extack);
> 2932 /* Drivers should call free_netdev() in ->destructor
> 2933 * and unregister it on failure after registration
> 2934 * so that device could be finally freed in rtnl_unlock.
> 2935 */
> 2936 if (err < 0) {
> 2937 /* If device is not registered at all, free it now */
> 2938 if (dev->reg_state == NETREG_UNINITIALIZED)
> 2939 free_netdev(dev);
> 2940 goto out;
> 2941 }
> 2942 } else {
> 2943 err = register_netdevice(dev);
> 2944 if (err < 0) {
> 2945 free_netdev(dev);
> 2946 goto out;
> 2947 }
> 2948 }
> 2949 err = rtnl_configure_link(dev, ifm);
> 2950 if (err < 0)
> 2951 goto out_unregister;
> 2952 if (link_net) {
> 2953 err = dev_change_net_namespace(dev, dest_net, ifname);
> 2954 if (err < 0)
> 2955 goto out_unregister;
> 2956 }
> 2957 if (tb[IFLA_MASTER]) {
> 2958 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]),
> 2959 extack);
> 2960 if (err)
> 2961 goto out_unregister;
> 2962 }
> 2963 out:
> 2964 if (link_net)
> 2965 put_net(link_net);
> 2966 put_net(dest_net);
> 2967 return err;
> 2968 out_unregister:
> 2969 if (ops->newlink) {
> 2970 LIST_HEAD(list_kill);
> 2971
> 2972 ops->dellink(dev, &list_kill);
> 2973 unregister_netdevice_many(&list_kill);
> 2974 } else {
> 2975 unregister_netdevice(dev);
> 2976 }
> 2977 goto out;
> 2978 }
> 2979 }
> 2980
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation

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In reply to: kbuild test robot: "Re: [PATCH net-next 1/1] rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK"
Next in thread: David Miller: "Re: [PATCH net-next 1/1] rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK"
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