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* lib/route/link/inet.c AF_INET link operations
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* Copyright (c) 2010 Thomas Graf <tgraf@suug.ch>
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* @defgroup link_inet IPv4 Link Module
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* @brief Implementation of IPv4 specific link attributes
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* @par Example: Reading the value of IPV4_DEVCONF_FORWARDING
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* struct nl_cache *cache;
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* struct rtnl_link *link;
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* // Allocate a link cache
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* rtnl_link_alloc_cache(sock, AF_UNSPEC, &cache);
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* // Search for the link we wish to see the value from
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* link = rtnl_link_get_by_name(cache, "eth0");
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* // Read the value of the setting IPV4_DEVCONF_FORWARDING
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* if (rtnl_link_inet_get_conf(link, IPV4_DEVCONF_FORWARDING, &value) < 0)
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* // Error: Unable to read config setting
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* printf("forwarding is %s\n", value ? "enabled" : "disabled");
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* @par Example: Changing the value of IPV4_DEVCONF_FOWARDING
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* // ... Continueing from the previous example ...
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* struct rtnl_link *new;
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* // Allocate a new link to store the changes we wish to make.
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* new = rtnl_link_alloc();
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* // Set IPV4_DEVCONF_FORWARDING to '1'
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* rtnl_link_inet_set_conf(new, IPV4_DEVCONF_FORWARDING, 1);
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* // Send the change request to the kernel.
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* rtnl_link_change(sock, link, new, 0);
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#include <netlink-local.h>
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#include <netlink/netlink.h>
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#include <netlink/attr.h>
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#include <netlink/route/rtnl.h>
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#include <netlink/route/link/api.h>
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uint8_t i_confset[IPV4_DEVCONF_MAX];
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uint32_t i_conf[IPV4_DEVCONF_MAX];
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static void *inet_alloc(struct rtnl_link *link)
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return calloc(1, sizeof(struct inet_data));
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static void *inet_clone(struct rtnl_link *link, void *data)
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if ((id = inet_alloc(link)))
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memcpy(id, data, sizeof(*id));
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static void inet_free(struct rtnl_link *link, void *data)
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static struct nla_policy inet_policy[IFLA_INET6_MAX+1] = {
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[IFLA_INET_CONF] = { .minlen = IPV4_DEVCONF_MAX * 4 },
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static int inet_parse_af(struct rtnl_link *link, struct nlattr *attr, void *data)
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struct inet_data *id = data;
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struct nlattr *tb[IFLA_INET_MAX+1];
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err = nla_parse_nested(tb, IFLA_INET_MAX, attr, inet_policy);
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if (tb[IFLA_INET_CONF])
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nla_memcpy(&id->i_conf, tb[IFLA_INET_CONF], sizeof(id->i_conf));
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static int inet_fill_af(struct rtnl_link *link, struct nl_msg *msg, void *data)
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struct inet_data *id = data;
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if (!(nla = nla_nest_start(msg, IFLA_INET_CONF)))
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for (i = 0; i < IPV4_DEVCONF_MAX; i++)
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if (id->i_confset[i])
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NLA_PUT_U32(msg, i+1, id->i_conf[i]);
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nla_nest_end(msg, nla);
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static const struct trans_tbl inet_devconf[] = {
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__ADD(IPV4_DEVCONF_FORWARDING, forwarding)
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__ADD(IPV4_DEVCONF_MC_FORWARDING, mc_forwarding)
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__ADD(IPV4_DEVCONF_PROXY_ARP, proxy_arp)
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__ADD(IPV4_DEVCONF_ACCEPT_REDIRECTS, accept_redirects)
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__ADD(IPV4_DEVCONF_SECURE_REDIRECTS, secure_redirects)
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__ADD(IPV4_DEVCONF_SEND_REDIRECTS, send_redirects)
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__ADD(IPV4_DEVCONF_SHARED_MEDIA, shared_media)
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__ADD(IPV4_DEVCONF_RP_FILTER, rp_filter)
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__ADD(IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE, accept_source_route)
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__ADD(IPV4_DEVCONF_BOOTP_RELAY, bootp_relay)
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__ADD(IPV4_DEVCONF_LOG_MARTIANS, log_martians)
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__ADD(IPV4_DEVCONF_TAG, tag)
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__ADD(IPV4_DEVCONF_ARPFILTER, arpfilter)
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__ADD(IPV4_DEVCONF_MEDIUM_ID, medium_id)
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__ADD(IPV4_DEVCONF_NOXFRM, noxfrm)
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__ADD(IPV4_DEVCONF_NOPOLICY, nopolicy)
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__ADD(IPV4_DEVCONF_FORCE_IGMP_VERSION, force_igmp_version)
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__ADD(IPV4_DEVCONF_ARP_ANNOUNCE, arp_announce)
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__ADD(IPV4_DEVCONF_ARP_IGNORE, arp_ignore)
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__ADD(IPV4_DEVCONF_PROMOTE_SECONDARIES, promote_secondaries)
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__ADD(IPV4_DEVCONF_ARP_ACCEPT, arp_accept)
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__ADD(IPV4_DEVCONF_ARP_NOTIFY, arp_notify)
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__ADD(IPV4_DEVCONF_ACCEPT_LOCAL, accept_local)
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__ADD(IPV4_DEVCONF_SRC_VMARK, src_vmark)
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__ADD(IPV4_DEVCONF_PROXY_ARP_PVLAN, proxy_arp_pvlan)
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const char *rtnl_link_inet_devconf2str(int type, char *buf, size_t len)
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return __type2str(type, buf, len, inet_devconf,
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ARRAY_SIZE(inet_devconf));
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unsigned int rtnl_link_inet_str2devconf(const char *name)
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return __str2type(name, inet_devconf, ARRAY_SIZE(inet_devconf));
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static void inet_dump_details(struct rtnl_link *link,
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struct nl_dump_params *p, void *data)
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struct inet_data *id = data;
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nl_dump_line(p, " ipv4 devconf:\n");
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nl_dump_line(p, " ");
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for (i = 0; i < IPV4_DEVCONF_MAX; i++) {
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nl_dump_line(p, "%-19s %3u",
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rtnl_link_inet_devconf2str(i+1, buf, sizeof(buf)),
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nl_dump_line(p, " ");
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static struct rtnl_link_af_ops inet_ops = {
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.ao_family = AF_INET,
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.ao_alloc = &inet_alloc,
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.ao_clone = &inet_clone,
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.ao_free = &inet_free,
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.ao_parse_af = &inet_parse_af,
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.ao_fill_af = &inet_fill_af,
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.ao_dump[NL_DUMP_DETAILS] = &inet_dump_details,
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* Get value of a ipv4 link configuration setting
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* @arg link Link object
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* @arg cfgid Configuration identifier
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* @arg res Result pointer
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* Stores the value of the specified configuration setting in the provided
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* @return 0 on success or a negative error code.
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* @return -NLE_RANGE cfgid is out of range, 1..IPV4_DEVCONF_MAX
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* @return -NLE_NOATTR configuration setting not available
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int rtnl_link_inet_get_conf(struct rtnl_link *link, const unsigned int cfgid,
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struct inet_data *id;
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if (cfgid == 0 || cfgid > IPV4_DEVCONF_MAX)
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if (!(id = rtnl_link_af_alloc(link, &inet_ops)))
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*res = id->i_conf[cfgid - 1];
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* Change value of a ipv4 link configuration setting
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* @arg link Link object
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* @arg cfgid Configuration identifier
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* @arg value New value
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* Changes the value in the per link ipv4 configuration array.
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* @return 0 on success or a negative error code.
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* @return -NLE_RANGE cfgid is out of range, 1..IPV4_DEVCONF_MAX
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* @return -NLE_NOMEM memory allocation failed
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int rtnl_link_inet_set_conf(struct rtnl_link *link, const unsigned int cfgid,
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struct inet_data *id;
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if (!(id = rtnl_link_af_alloc(link, &inet_ops)))
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if (cfgid == 0 || cfgid > IPV4_DEVCONF_MAX)
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id->i_confset[cfgid - 1] = 1;
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id->i_conf[cfgid - 1] = value;
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static void __init inet_init(void)
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rtnl_link_af_register(&inet_ops);
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static void __exit inet_exit(void)
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rtnl_link_af_unregister(&inet_ops);