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540 lines
11 KiB
540 lines
11 KiB
/*
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* lib/route/link/ipip.c IPIP Link Info
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*
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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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* of the License.
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*
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* Copyright (c) 2014 Susant Sahani <susant@redhat.com>
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*/
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/**
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* @ingroup link
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* @defgroup ipip IPIP
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* ipip link module
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*
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* @details
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* \b Link Type Name: "ipip"
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*
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* @route_doc{link_ipip, IPIP Documentation}
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*
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* @{
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*/
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#include <netlink-private/netlink.h>
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#include <netlink/netlink.h>
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#include <netlink/attr.h>
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#include <netlink/utils.h>
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#include <netlink/object.h>
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#include <netlink/route/rtnl.h>
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#include <netlink/route/link/ipip.h>
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#include <netlink-private/route/link/api.h>
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#include <linux/if_tunnel.h>
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#define IPIP_ATTR_LINK (1 << 0)
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#define IPIP_ATTR_LOCAL (1 << 1)
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#define IPIP_ATTR_REMOTE (1 << 2)
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#define IPIP_ATTR_TTL (1 << 3)
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#define IPIP_ATTR_TOS (1 << 4)
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#define IPIP_ATTR_PMTUDISC (1 << 5)
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struct ipip_info
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{
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uint8_t ttl;
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uint8_t tos;
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uint8_t pmtudisc;
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uint32_t link;
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uint32_t local;
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uint32_t remote;
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uint32_t ipip_mask;
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};
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static struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
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[IFLA_IPTUN_LINK] = { .type = NLA_U32 },
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[IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
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[IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
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[IFLA_IPTUN_TTL] = { .type = NLA_U8 },
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[IFLA_IPTUN_TOS] = { .type = NLA_U8 },
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[IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
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};
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static int ipip_alloc(struct rtnl_link *link)
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{
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struct ipip_info *ipip;
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if (link->l_info)
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memset(link->l_info, 0, sizeof(*ipip));
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else {
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ipip = calloc(1, sizeof(*ipip));
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if (!ipip)
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return -NLE_NOMEM;
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link->l_info = ipip;
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}
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return 0;
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}
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static int ipip_parse(struct rtnl_link *link, struct nlattr *data,
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struct nlattr *xstats)
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{
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struct nlattr *tb[IFLA_IPTUN_MAX + 1];
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struct ipip_info *ipip;
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int err;
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NL_DBG(3, "Parsing IPIP link info\n");
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err = nla_parse_nested(tb, IFLA_IPTUN_MAX, data, ipip_policy);
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if (err < 0)
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goto errout;
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err = ipip_alloc(link);
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if (err < 0)
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goto errout;
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ipip = link->l_info;
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if (tb[IFLA_IPTUN_LINK]) {
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ipip->link = nla_get_u32(tb[IFLA_IPTUN_LINK]);
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ipip->ipip_mask |= IPIP_ATTR_LINK;
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}
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if (tb[IFLA_IPTUN_LOCAL]) {
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ipip->local = nla_get_u32(tb[IFLA_IPTUN_LOCAL]);
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ipip->ipip_mask |= IPIP_ATTR_LOCAL;
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}
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if (tb[IFLA_IPTUN_REMOTE]) {
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ipip->remote = nla_get_u32(tb[IFLA_IPTUN_REMOTE]);
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ipip->ipip_mask |= IPIP_ATTR_REMOTE;
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}
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if (tb[IFLA_IPTUN_TTL]) {
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ipip->ttl = nla_get_u8(tb[IFLA_IPTUN_TTL]);
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ipip->ipip_mask |= IPIP_ATTR_TTL;
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}
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if (tb[IFLA_IPTUN_TOS]) {
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ipip->tos = nla_get_u8(tb[IFLA_IPTUN_TOS]);
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ipip->ipip_mask |= IPIP_ATTR_TOS;
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}
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if (tb[IFLA_IPTUN_PMTUDISC]) {
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ipip->pmtudisc = nla_get_u8(tb[IFLA_IPTUN_PMTUDISC]);
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ipip->ipip_mask |= IPIP_ATTR_PMTUDISC;
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}
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err = 0;
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errout:
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return err;
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}
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static int ipip_put_attrs(struct nl_msg *msg, struct rtnl_link *link)
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{
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struct ipip_info *ipip = link->l_info;
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struct nlattr *data;
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data = nla_nest_start(msg, IFLA_INFO_DATA);
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if (!data)
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return -NLE_MSGSIZE;
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if (ipip->ipip_mask & IPIP_ATTR_LINK)
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NLA_PUT_U32(msg, IFLA_IPTUN_LINK, ipip->link);
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if (ipip->ipip_mask & IPIP_ATTR_LOCAL)
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NLA_PUT_U32(msg, IFLA_IPTUN_LOCAL, ipip->local);
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if (ipip->ipip_mask & IPIP_ATTR_REMOTE)
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NLA_PUT_U32(msg, IFLA_IPTUN_REMOTE, ipip->remote);
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if (ipip->ipip_mask & IPIP_ATTR_TTL)
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NLA_PUT_U8(msg, IFLA_IPTUN_TTL, ipip->ttl);
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if (ipip->ipip_mask & IPIP_ATTR_TOS)
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NLA_PUT_U8(msg, IFLA_IPTUN_TOS, ipip->tos);
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if (ipip->ipip_mask & IPIP_ATTR_PMTUDISC)
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NLA_PUT_U8(msg, IFLA_IPTUN_PMTUDISC, ipip->pmtudisc);
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nla_nest_end(msg, data);
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nla_put_failure:
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return 0;
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}
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static void ipip_free(struct rtnl_link *link)
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{
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struct ipip_info *ipip = link->l_info;
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free(ipip);
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link->l_info = NULL;
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}
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static void ipip_dump_line(struct rtnl_link *link, struct nl_dump_params *p)
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{
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nl_dump(p, "ipip : %s", link->l_name);
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}
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static void ipip_dump_details(struct rtnl_link *link, struct nl_dump_params *p)
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{
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struct ipip_info *ipip = link->l_info;
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char *name, addr[INET_ADDRSTRLEN];
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struct rtnl_link *parent;
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if (ipip->ipip_mask & IPIP_ATTR_LINK) {
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nl_dump(p, " link ");
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name = NULL;
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parent = link_lookup(link->ce_cache, ipip->link);
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if (parent)
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name = rtnl_link_get_name(parent);
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if (name)
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nl_dump_line(p, "%s\n", name);
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else
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nl_dump_line(p, "%u\n", ipip->link);
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}
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if (ipip->ipip_mask & IPIP_ATTR_LOCAL) {
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nl_dump(p, " local ");
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if(inet_ntop(AF_INET, &ipip->local, addr, sizeof(addr)))
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nl_dump_line(p, "%s\n", addr);
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else
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nl_dump_line(p, "%#x\n", ntohs(ipip->local));
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}
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if (ipip->ipip_mask & IPIP_ATTR_REMOTE) {
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nl_dump(p, " remote ");
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if(inet_ntop(AF_INET, &ipip->remote, addr, sizeof(addr)))
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nl_dump_line(p, "%s\n", addr);
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else
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nl_dump_line(p, "%#x\n", ntohs(ipip->remote));
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}
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if (ipip->ipip_mask & IPIP_ATTR_TTL) {
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nl_dump(p, " ttl ");
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nl_dump_line(p, "%u\n", ipip->ttl);
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}
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if (ipip->ipip_mask & IPIP_ATTR_TOS) {
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nl_dump(p, " tos ");
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nl_dump_line(p, "%u\n", ipip->tos);
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}
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if (ipip->ipip_mask & IPIP_ATTR_PMTUDISC) {
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nl_dump(p, " pmtudisc ");
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nl_dump_line(p, "enabled (%#x)\n", ipip->pmtudisc);
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}
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}
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static int ipip_clone(struct rtnl_link *dst, struct rtnl_link *src)
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{
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struct ipip_info *ipip_dst, *ipip_src = src->l_info;
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int err;
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dst->l_info = NULL;
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err = rtnl_link_set_type(dst, "ipip");
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if (err < 0)
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return err;
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ipip_dst = dst->l_info;
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if (!ipip_dst || !ipip_src)
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BUG();
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memcpy(ipip_dst, ipip_src, sizeof(struct ipip_info));
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return 0;
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}
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static struct rtnl_link_info_ops ipip_info_ops = {
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.io_name = "ipip",
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.io_alloc = ipip_alloc,
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.io_parse = ipip_parse,
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.io_dump = {
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[NL_DUMP_LINE] = ipip_dump_line,
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[NL_DUMP_DETAILS] = ipip_dump_details,
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},
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.io_clone = ipip_clone,
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.io_put_attrs = ipip_put_attrs,
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.io_free = ipip_free,
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};
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#define IS_IPIP_LINK_ASSERT(link) \
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if ((link)->l_info_ops != &ipip_info_ops) { \
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APPBUG("Link is not a ipip link. set type \"ipip\" first."); \
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return -NLE_OPNOTSUPP; \
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}
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struct rtnl_link *rtnl_link_ipip_alloc(void)
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{
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struct rtnl_link *link;
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int err;
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link = rtnl_link_alloc();
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if (!link)
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return NULL;
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err = rtnl_link_set_type(link, "ipip");
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if (err < 0) {
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rtnl_link_put(link);
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return NULL;
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}
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return link;
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}
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/**
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* Check if link is a IPIP link
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* @arg link Link object
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*
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* @return True if link is a IPIP link, otherwise false is returned.
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*/
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int rtnl_link_is_ipip(struct rtnl_link *link)
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{
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return link->l_info_ops && !strcmp(link->l_info_ops->io_name, "ipip");
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}
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/**
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* Create a new ipip tunnel device
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* @arg sock netlink socket
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* @arg name name of the tunnel deviceL
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*
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* Creates a new ipip tunnel device in the kernel
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* @return 0 on success or a negative error code
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*/
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int rtnl_link_ipip_add(struct nl_sock *sk, const char *name)
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{
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struct rtnl_link *link;
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int err;
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link = rtnl_link_ipip_alloc();
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if (!link)
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return -NLE_NOMEM;
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if(name)
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rtnl_link_set_name(link, name);
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err = rtnl_link_add(sk, link, NLM_F_CREATE);
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rtnl_link_put(link);
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return err;
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}
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/**
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* Set IPIP tunnel interface index
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* @arg link Link object
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* @arg index interface index
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*
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* @return 0 on success or a negative error code
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*/
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int rtnl_link_ipip_set_link(struct rtnl_link *link, uint32_t index)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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ipip->link = index;
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ipip->ipip_mask |= IPIP_ATTR_LINK;
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return 0;
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}
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/**
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* Get IPIP tunnel interface index
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* @arg link Link object
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*
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* @return interface index value
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*/
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uint32_t rtnl_link_ipip_get_link(struct rtnl_link *link)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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return ipip->link;
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}
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/**
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* Set IPIP tunnel local address
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* @arg link Link object
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* @arg addr local address
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*
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* @return 0 on success or a negative error code
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*/
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int rtnl_link_ipip_set_local(struct rtnl_link *link, uint32_t addr)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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ipip->local = addr;
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ipip->ipip_mask |= IPIP_ATTR_LOCAL;
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return 0;
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}
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/**
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* Get IPIP tunnel local address
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* @arg link Link object
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*
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* @return local address value
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*/
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uint32_t rtnl_link_ipip_get_local(struct rtnl_link *link)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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return ipip->local;
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}
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/**
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* Set IPIP tunnel remote address
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* @arg link Link object
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* @arg remote remote address
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*
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* @return 0 on success or a negative error code
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*/
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int rtnl_link_ipip_set_remote(struct rtnl_link *link, uint32_t addr)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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ipip->remote = addr;
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ipip->ipip_mask |= IPIP_ATTR_REMOTE;
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return 0;
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}
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/**
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* Get IPIP tunnel remote address
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* @arg link Link object
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*
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* @return remote address
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*/
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uint32_t rtnl_link_ipip_get_remote(struct rtnl_link *link)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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return ipip->remote;
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}
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/**
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* Set IPIP tunnel ttl
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* @arg link Link object
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* @arg ttl tunnel ttl
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*
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* @return 0 on success or a negative error code
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*/
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int rtnl_link_ipip_set_ttl(struct rtnl_link *link, uint8_t ttl)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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ipip->ttl = ttl;
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ipip->ipip_mask |= IPIP_ATTR_TTL;
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return 0;
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}
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/**
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* Get IPIP tunnel ttl
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* @arg link Link object
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*
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* @return ttl value
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*/
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uint8_t rtnl_link_ipip_get_ttl(struct rtnl_link *link)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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return ipip->ttl;
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}
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/**
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* Set IPIP tunnel tos
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* @arg link Link object
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* @arg tos tunnel tos
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*
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* @return 0 on success or a negative error code
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*/
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int rtnl_link_ipip_set_tos(struct rtnl_link *link, uint8_t tos)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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ipip->tos = tos;
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ipip->ipip_mask |= IPIP_ATTR_TOS;
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return 0;
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}
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/**
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* Get IPIP tunnel tos
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* @arg link Link object
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*
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* @return tos value
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*/
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uint8_t rtnl_link_ipip_get_tos(struct rtnl_link *link)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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return ipip->tos;
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}
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/**
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* Set IPIP tunnel path MTU discovery
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* @arg link Link object
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* @arg pmtudisc path MTU discovery
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*
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* @return 0 on success or a negative error code
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*/
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int rtnl_link_ipip_set_pmtudisc(struct rtnl_link *link, uint8_t pmtudisc)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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ipip->pmtudisc = pmtudisc;
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ipip->ipip_mask |= IPIP_ATTR_PMTUDISC;
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return 0;
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}
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/**
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* Get IPIP path MTU discovery
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* @arg link Link object
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*
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* @return pmtudisc value
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*/
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uint8_t rtnl_link_ipip_get_pmtudisc(struct rtnl_link *link)
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{
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struct ipip_info *ipip = link->l_info;
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IS_IPIP_LINK_ASSERT(link);
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return ipip->pmtudisc;
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}
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static void __init ipip_init(void)
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{
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rtnl_link_register_info(&ipip_info_ops);
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}
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static void __exit ipip_exit(void)
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{
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rtnl_link_unregister_info(&ipip_info_ops);
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}
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