![Al Viro](/assets/img/avatar_default.png)
Piss-poor sysctl registration API strikes again, film at 11... What we really need is _pathname_ required to be present in already registered table, so that kernel could warn about bad order. That's the next target for sysctl stuff (and generally saner and more explicit order of initialization of ipv[46] internals wouldn't hurt either). For the time being, here are full fixups required by ..._rotable() stuff; we make per-net sysctl sets descendents of "ro" one and make sure that sufficient skeleton is there before we start registering per-net sysctls. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
169 lines
3.5 KiB
C
169 lines
3.5 KiB
C
/*
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* sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
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*
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* Changes:
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* YOSHIFUJI Hideaki @USAGI: added icmp sysctl table.
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*/
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#include <linux/mm.h>
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#include <linux/sysctl.h>
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <net/ndisc.h>
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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#include <net/inet_frag.h>
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static ctl_table ipv6_table_template[] = {
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{
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.ctl_name = NET_IPV6_ROUTE,
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.procname = "route",
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.maxlen = 0,
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.mode = 0555,
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.child = ipv6_route_table_template
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},
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{
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.ctl_name = NET_IPV6_ICMP,
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.procname = "icmp",
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.maxlen = 0,
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.mode = 0555,
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.child = ipv6_icmp_table_template
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},
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{
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.ctl_name = NET_IPV6_BINDV6ONLY,
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.procname = "bindv6only",
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.data = &init_net.ipv6.sysctl.bindv6only,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{ .ctl_name = 0 }
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};
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static ctl_table ipv6_table[] = {
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{
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.ctl_name = NET_IPV6_MLD_MAX_MSF,
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.procname = "mld_max_msf",
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.data = &sysctl_mld_max_msf,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{ .ctl_name = 0 }
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};
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struct ctl_path net_ipv6_ctl_path[] = {
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{ .procname = "net", .ctl_name = CTL_NET, },
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{ .procname = "ipv6", .ctl_name = NET_IPV6, },
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{ },
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};
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EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);
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static int ipv6_sysctl_net_init(struct net *net)
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{
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struct ctl_table *ipv6_table;
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struct ctl_table *ipv6_route_table;
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struct ctl_table *ipv6_icmp_table;
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int err;
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err = -ENOMEM;
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ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
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GFP_KERNEL);
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if (!ipv6_table)
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goto out;
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ipv6_route_table = ipv6_route_sysctl_init(net);
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if (!ipv6_route_table)
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goto out_ipv6_table;
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ipv6_table[0].child = ipv6_route_table;
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ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
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if (!ipv6_icmp_table)
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goto out_ipv6_route_table;
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ipv6_table[1].child = ipv6_icmp_table;
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ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;
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net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
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ipv6_table);
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if (!net->ipv6.sysctl.table)
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goto out_ipv6_icmp_table;
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err = 0;
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out:
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return err;
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out_ipv6_icmp_table:
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kfree(ipv6_icmp_table);
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out_ipv6_route_table:
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kfree(ipv6_route_table);
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out_ipv6_table:
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kfree(ipv6_table);
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goto out;
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}
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static void ipv6_sysctl_net_exit(struct net *net)
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{
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struct ctl_table *ipv6_table;
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struct ctl_table *ipv6_route_table;
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struct ctl_table *ipv6_icmp_table;
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ipv6_table = net->ipv6.sysctl.table->ctl_table_arg;
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ipv6_route_table = ipv6_table[0].child;
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ipv6_icmp_table = ipv6_table[1].child;
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unregister_net_sysctl_table(net->ipv6.sysctl.table);
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kfree(ipv6_table);
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kfree(ipv6_route_table);
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kfree(ipv6_icmp_table);
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}
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static struct pernet_operations ipv6_sysctl_net_ops = {
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.init = ipv6_sysctl_net_init,
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.exit = ipv6_sysctl_net_exit,
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};
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static struct ctl_table_header *ip6_header;
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int ipv6_sysctl_register(void)
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{
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int err = -ENOMEM;;
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ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_table);
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if (ip6_header == NULL)
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goto out;
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err = register_pernet_subsys(&ipv6_sysctl_net_ops);
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if (err)
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goto err_pernet;
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out:
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return err;
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err_pernet:
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unregister_net_sysctl_table(ip6_header);
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goto out;
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}
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void ipv6_sysctl_unregister(void)
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{
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unregister_net_sysctl_table(ip6_header);
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unregister_pernet_subsys(&ipv6_sysctl_net_ops);
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}
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static struct ctl_table_header *ip6_base;
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int ipv6_static_sysctl_register(void)
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{
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static struct ctl_table empty[1];
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ip6_base = register_net_sysctl_rotable(net_ipv6_ctl_path, empty);
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if (ip6_base == NULL)
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return -ENOMEM;
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return 0;
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}
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void ipv6_static_sysctl_unregister(void)
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{
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unregister_net_sysctl_table(ip6_base);
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}
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