ipgre.c

/* SPDX-License-Identifier: LGPL-2.1-only */
/*
 * Copyright (c) 2014 Susant Sahani <susant@redhat.com>
 */
 
/**
 * @ingroup link
 * @defgroup ipgre IPGRE
 * ipgre link module
 *
 * @details
 * \b Link Type Name: "ipgre"
 *
 * @route_doc{link_ipgre, IPGRE Documentation}
 *
 * @{
 */
 
#include "nl-default.h"
 
#include <linux/if_tunnel.h>
 
#include <netlink/netlink.h>
#include <netlink/attr.h>
#include <netlink/utils.h>
#include <netlink/object.h>
#include <netlink/route/rtnl.h>
#include <netlink/route/link/ipgre.h>
 
#include "nl-route.h"
#include "link-api.h"
#include "nl-aux-route/nl-route.h"
 
#define IPGRE_ATTR_LINK          (1 << 0)
#define IPGRE_ATTR_IFLAGS        (1 << 1)
#define IPGRE_ATTR_OFLAGS        (1 << 2)
#define IPGRE_ATTR_IKEY          (1 << 3)
#define IPGRE_ATTR_OKEY          (1 << 4)
#define IPGRE_ATTR_LOCAL         (1 << 5)
#define IPGRE_ATTR_REMOTE        (1 << 6)
#define IPGRE_ATTR_TTL           (1 << 7)
#define IPGRE_ATTR_TOS           (1 << 8)
#define IPGRE_ATTR_PMTUDISC      (1 << 9)
#define IPGRE_ATTR_FWMARK        (1 << 10)
 
struct ipgre_info
{
        uint8_t    ttl;
        uint8_t    tos;
        uint8_t    pmtudisc;
        uint16_t   iflags;
        uint16_t   oflags;
        uint32_t   ikey;
        uint32_t   okey;
        uint32_t   link;
        uint32_t   local;
        uint32_t   remote;
        uint32_t   fwmark;
        uint32_t   ipgre_mask;
};
 
static  struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = {
        [IFLA_GRE_LINK]     = { .type = NLA_U32 },
        [IFLA_GRE_IFLAGS]   = { .type = NLA_U16 },
        [IFLA_GRE_OFLAGS]   = { .type = NLA_U16 },
        [IFLA_GRE_IKEY]     = { .type = NLA_U32 },
        [IFLA_GRE_OKEY]     = { .type = NLA_U32 },
        [IFLA_GRE_LOCAL]    = { .type = NLA_U32 },
        [IFLA_GRE_REMOTE]   = { .type = NLA_U32 },
        [IFLA_GRE_TTL]      = { .type = NLA_U8 },
        [IFLA_GRE_TOS]      = { .type = NLA_U8 },
        [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 },
        [IFLA_GRE_FWMARK]   = { .type = NLA_U32 },
};
 
static int ipgre_alloc(struct rtnl_link *link)
{
        struct ipgre_info *ipgre;
 
        if (link->l_info)
                memset(link->l_info, 0, sizeof(*ipgre));
        else {
                ipgre = calloc(1, sizeof(*ipgre));
                if (!ipgre)
                        return -NLE_NOMEM;
 
                link->l_info = ipgre;
        }
 
        return 0;
}
 
static int ipgre_parse(struct rtnl_link *link, struct nlattr *data,
                       struct nlattr *xstats)
{
        struct nlattr *tb[IFLA_GRE_MAX + 1];
        struct ipgre_info *ipgre;
        int err;
 
        NL_DBG(3, "Parsing IPGRE link info\n");
 
        err = nla_parse_nested(tb, IFLA_GRE_MAX, data, ipgre_policy);
        if (err < 0)
                goto errout;
 
        err = ipgre_alloc(link);
        if (err < 0)
                goto errout;
 
        ipgre = link->l_info;
 
        if (tb[IFLA_GRE_LINK]) {
                ipgre->link = nla_get_u32(tb[IFLA_GRE_LINK]);
                ipgre->ipgre_mask |= IPGRE_ATTR_LINK;
        }
 
        if (tb[IFLA_GRE_IFLAGS]) {
                ipgre->iflags = nla_get_u16(tb[IFLA_GRE_IFLAGS]);
                ipgre->ipgre_mask |= IPGRE_ATTR_IFLAGS;
        }
 
        if (tb[IFLA_GRE_OFLAGS]) {
                ipgre->oflags = nla_get_u16(tb[IFLA_GRE_OFLAGS]);
                ipgre->ipgre_mask |= IPGRE_ATTR_OFLAGS;
        }
 
        if (tb[IFLA_GRE_IKEY]) {
                ipgre->ikey = nla_get_u32(tb[IFLA_GRE_IKEY]);
                ipgre->ipgre_mask |= IPGRE_ATTR_IKEY;
        }
 
        if (tb[IFLA_GRE_OKEY]) {
                ipgre->okey = nla_get_u32(tb[IFLA_GRE_OKEY]);
                ipgre->ipgre_mask |= IPGRE_ATTR_OKEY;
        }
 
        if (tb[IFLA_GRE_LOCAL]) {
                ipgre->local = nla_get_u32(tb[IFLA_GRE_LOCAL]);
                ipgre->ipgre_mask |= IPGRE_ATTR_LOCAL;
        }
 
        if (tb[IFLA_GRE_REMOTE]) {
                ipgre->remote = nla_get_u32(tb[IFLA_GRE_REMOTE]);
                ipgre->ipgre_mask |= IPGRE_ATTR_REMOTE;
        }
 
        if (tb[IFLA_GRE_TTL]) {
                ipgre->ttl = nla_get_u8(tb[IFLA_GRE_TTL]);
                ipgre->ipgre_mask |= IPGRE_ATTR_TTL;
        }
 
        if (tb[IFLA_GRE_TOS]) {
                ipgre->tos = nla_get_u8(tb[IFLA_GRE_TOS]);
                ipgre->ipgre_mask |= IPGRE_ATTR_TOS;
        }
 
        if (tb[IFLA_GRE_PMTUDISC]) {
                ipgre->pmtudisc = nla_get_u8(tb[IFLA_GRE_PMTUDISC]);
                ipgre->ipgre_mask |= IPGRE_ATTR_PMTUDISC;
        }
 
        if (tb[IFLA_GRE_FWMARK]) {
                ipgre->fwmark = nla_get_u32(tb[IFLA_GRE_FWMARK]);
                ipgre->ipgre_mask |= IPGRE_ATTR_FWMARK;
        }
 
        err = 0;
 
errout:
        return err;
}
 
static int ipgre_put_attrs(struct nl_msg *msg, struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
        struct nlattr *data;
 
        data = nla_nest_start(msg, IFLA_INFO_DATA);
        if (!data)
                return -NLE_MSGSIZE;
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_LINK)
                NLA_PUT_U32(msg, IFLA_GRE_LINK, ipgre->link);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_IFLAGS)
                NLA_PUT_U16(msg, IFLA_GRE_IFLAGS, ipgre->iflags);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_OFLAGS)
                NLA_PUT_U16(msg, IFLA_GRE_OFLAGS, ipgre->oflags);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_IKEY)
                NLA_PUT_U32(msg, IFLA_GRE_IKEY, ipgre->ikey);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_OKEY)
                NLA_PUT_U32(msg, IFLA_GRE_OKEY, ipgre->okey);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_LOCAL)
                NLA_PUT_U32(msg, IFLA_GRE_LOCAL, ipgre->local);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_REMOTE)
                NLA_PUT_U32(msg, IFLA_GRE_REMOTE, ipgre->remote);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_TTL)
                NLA_PUT_U8(msg, IFLA_GRE_TTL, ipgre->ttl);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_TOS)
                NLA_PUT_U8(msg, IFLA_GRE_TOS, ipgre->tos);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_PMTUDISC)
                NLA_PUT_U8(msg, IFLA_GRE_PMTUDISC, ipgre->pmtudisc);
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_FWMARK)
                NLA_PUT_U32(msg, IFLA_GRE_FWMARK, ipgre->fwmark);
 
        nla_nest_end(msg, data);
 
nla_put_failure:
 
        return 0;
}
 
static void ipgre_free(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        free(ipgre);
        link->l_info = NULL;
}
 
static void ipgre_dump_line(struct rtnl_link *link, struct nl_dump_params *p)
{
        nl_dump(p, "ipgre : %s", link->l_name);
}
 
static void ipgre_dump_details(struct rtnl_link *link, struct nl_dump_params *p)
{
        struct ipgre_info *ipgre = link->l_info;
        char addr[INET_ADDRSTRLEN];
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_LINK) {
                _nl_auto_rtnl_link struct rtnl_link *parent = NULL;
                char *name;
 
                nl_dump(p, "      link ");
 
                name = NULL;
                parent = link_lookup(link->ce_cache, ipgre->link);
                if (parent)
                        name = rtnl_link_get_name(parent);
 
                if (name)
                        nl_dump_line(p, "%s\n", name);
                else
                        nl_dump_line(p, "%u\n", ipgre->link);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_IFLAGS) {
                nl_dump(p, "      iflags ");
                nl_dump_line(p, "%x\n", ipgre->iflags);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_OFLAGS) {
                nl_dump(p, "      oflags ");
                nl_dump_line(p, "%x\n", ipgre->oflags);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_IKEY) {
                nl_dump(p, "    ikey   ");
                nl_dump_line(p, "%x\n", ipgre->ikey);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_OKEY) {
                nl_dump(p, "      okey ");
                nl_dump_line(p, "%x\n", ipgre->okey);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_LOCAL) {
                nl_dump(p, "      local ");
                _nl_inet_ntop4(ipgre->local, addr);
                nl_dump_line(p, "%s\n", addr);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_REMOTE) {
                nl_dump(p, "      remote ");
                _nl_inet_ntop4(ipgre->remote, addr);
                nl_dump_line(p, "%s\n", addr);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_TTL) {
                nl_dump(p, "      ttl ");
                nl_dump_line(p, "%u\n", ipgre->ttl);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_TOS) {
                nl_dump(p, "      tos ");
                nl_dump_line(p, "%u\n", ipgre->tos);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_PMTUDISC) {
                nl_dump(p, "      pmtudisc ");
                nl_dump_line(p, "enabled (%#x)\n", ipgre->pmtudisc);
        }
 
        if (ipgre->ipgre_mask & IPGRE_ATTR_FWMARK) {
                nl_dump(p, "      fwmark ");
                nl_dump_line(p, "%x\n", ipgre->fwmark);
        }
}
 
static int ipgre_clone(struct rtnl_link *dst, struct rtnl_link *src)
{
        struct ipgre_info *ipgre_dst, *ipgre_src = src->l_info;
        int err;
 
        dst->l_info = NULL;
 
        err = rtnl_link_set_type(dst, "gre");
        if (err < 0)
                return err;
 
        ipgre_dst = dst->l_info;
 
        if (!ipgre_dst || !ipgre_src)
                BUG();
 
        memcpy(ipgre_dst, ipgre_src, sizeof(struct ipgre_info));
 
        return 0;
}
 
static int ipgretap_clone(struct rtnl_link *dst, struct rtnl_link *src)
{
        struct ipgre_info *ipgre_dst, *ipgre_src = src->l_info;
        int err;
 
        dst->l_info = NULL;
 
        err = rtnl_link_set_type(dst, "gretap");
        if (err < 0)
                return err;
 
        ipgre_dst = dst->l_info;
 
        if (!ipgre_dst || !ipgre_src)
                BUG();
 
        memcpy(ipgre_dst, ipgre_src, sizeof(struct ipgre_info));
 
        return 0;
}
 
static struct rtnl_link_info_ops ipgre_info_ops = {
        .io_name                = "gre",
        .io_alloc               = ipgre_alloc,
        .io_parse               = ipgre_parse,
        .io_dump = {
                [NL_DUMP_LINE]  = ipgre_dump_line,
                [NL_DUMP_DETAILS] = ipgre_dump_details,
        },
        .io_clone               = ipgre_clone,
        .io_put_attrs           = ipgre_put_attrs,
        .io_free                = ipgre_free,
};
 
static struct rtnl_link_info_ops ipgretap_info_ops = {
        .io_name                = "gretap",
        .io_alloc               = ipgre_alloc,
        .io_parse               = ipgre_parse,
        .io_dump = {
                [NL_DUMP_LINE]  = ipgre_dump_line,
                [NL_DUMP_DETAILS] = ipgre_dump_details,
        },
        .io_clone               = ipgretap_clone,
        .io_put_attrs           = ipgre_put_attrs,
        .io_free                = ipgre_free,
};
 
#define IS_IPGRE_LINK_ASSERT(link)                                                 \
        if ((link)->l_info_ops != &ipgre_info_ops &&                               \
            (link)->l_info_ops != &ipgretap_info_ops) {                            \
                APPBUG("Link is not a ipgre link. set type \"gre/gretap\" first.");\
                return -NLE_OPNOTSUPP;                                             \
        }
 
struct rtnl_link *rtnl_link_ipgre_alloc(void)
{
        struct rtnl_link *link;
        int err;
 
        link = rtnl_link_alloc();
        if (!link)
                return NULL;
 
        err = rtnl_link_set_type(link, "gre");
        if (err < 0) {
                rtnl_link_put(link);
                return NULL;
        }
 
        return link;
}
 
/**
 * Check if link is a IPGRE link
 * @arg link            Link object
 *
 * @return True if link is a IPGRE link, otherwise 0 is returned.
 */
int rtnl_link_is_ipgre(struct rtnl_link *link)
{
        return link->l_info_ops && !strcmp(link->l_info_ops->io_name, "gre");
}
 
/**
 * Create a new IPGRE tunnel device
 * @arg sock            netlink socket
 * @arg name            name of the tunnel deviceL
 *
 * Creates a new ipip tunnel device in the kernel
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_add(struct nl_sock *sk, const char *name)
{
        struct rtnl_link *link;
        int err;
 
        link = rtnl_link_ipgre_alloc();
        if (!link)
                return -NLE_NOMEM;
 
        if(name)
                rtnl_link_set_name(link, name);
 
        err = rtnl_link_add(sk, link, NLM_F_CREATE);
        rtnl_link_put(link);
 
        return err;
}
 
struct rtnl_link *rtnl_link_ipgretap_alloc(void)
{
        struct rtnl_link *link;
        int err;
 
        link = rtnl_link_alloc();
        if (!link)
                return NULL;
 
        err = rtnl_link_set_type(link, "gretap");
        if (err < 0) {
                rtnl_link_put(link);
                return NULL;
        }
 
        return link;
}
 
/**
 * Check if link is a IPGRETAP link
 * @arg link            Link object
 *
 * @return True if link is a IPGRETAP link, otherwise 0 is returned.
 */
int rtnl_link_is_ipgretap(struct rtnl_link *link)
{
        return link->l_info_ops && !strcmp(link->l_info_ops->io_name, "gretap");
}
/**
 * Create a new IPGRETAP tunnel device
 * @arg sock            netlink socket
 * @arg name            name of the tunnel deviceL
 *
 * Creates a new IPGRETAP tunnel device in the kernel
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgretap_add(struct nl_sock *sk, const char *name)
{
        struct rtnl_link *link;
        int err;
 
        link = rtnl_link_ipgretap_alloc();
        if (!link)
                return -NLE_NOMEM;
 
        if(name)
                rtnl_link_set_name(link, name);
 
        err = rtnl_link_add(sk, link, NLM_F_CREATE);
        rtnl_link_put(link);
 
        return err;
}
 
/**
 * Set IPGRE tunnel interface index
 * @arg link            Link object
 * @arg index           interface index
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_link(struct rtnl_link *link,  uint32_t index)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->link = index;
        ipgre->ipgre_mask |= IPGRE_ATTR_LINK;
 
        return 0;
}
 
/**
 * Get IPGRE tunnel interface index
 * @arg link            Link object
 *
 * @return interface index
 */
uint32_t rtnl_link_ipgre_get_link(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->link;
}
 
/**
 * Set IPGRE tunnel set iflags
 * @arg link            Link object
 * @arg iflags          gre iflags
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_iflags(struct rtnl_link *link, uint16_t iflags)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->iflags = iflags;
        ipgre->ipgre_mask |= IPGRE_ATTR_IFLAGS;
 
        return 0;
}
 
/**
 * Get IPGRE tunnel iflags
 * @arg link            Link object
 *
 * @return iflags
 */
uint16_t rtnl_link_ipgre_get_iflags(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->iflags;
}
 
/**
 * Set IPGRE tunnel set oflags
 * @arg link            Link object
 * @arg iflags          gre oflags
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_oflags(struct rtnl_link *link, uint16_t oflags)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->oflags = oflags;
        ipgre->ipgre_mask |= IPGRE_ATTR_OFLAGS;
 
        return 0;
}
 
/**
 * Get IPGRE tunnel oflags
 * @arg link            Link object
 *
 * @return oflags
 */
uint16_t rtnl_link_ipgre_get_oflags(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->oflags;
}
 
/**
 * Set IPGRE tunnel set ikey
 * @arg link            Link object
 * @arg ikey            gre ikey
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_ikey(struct rtnl_link *link, uint32_t ikey)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->ikey = ikey;
        ipgre->ipgre_mask |= IPGRE_ATTR_IKEY;
 
        return 0;
}
 
/**
 * Get IPGRE tunnel ikey
 * @arg link            Link object
 *
 * @return ikey
 */
uint32_t rtnl_link_ipgre_get_ikey(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->ikey;
}
 
/**
 * Set IPGRE tunnel set okey
 * @arg link            Link object
 * @arg okey            gre okey
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_okey(struct rtnl_link *link, uint32_t okey)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->okey = okey;
        ipgre->ipgre_mask |= IPGRE_ATTR_OKEY;
 
        return 0;
}
 
/**
 * Get IPGRE tunnel okey
 * @arg link            Link object
 *
 * @return okey value
 */
uint32_t rtnl_link_ipgre_get_okey(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->okey;
}
 
/**
 * Set IPGRE tunnel local address
 * @arg link            Link object
 * @arg addr            local address
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_local(struct rtnl_link *link, uint32_t addr)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->local = addr;
        ipgre->ipgre_mask |= IPGRE_ATTR_LOCAL;
 
        return 0;
}
 
/**
 * Get IPGRE tunnel local address
 * @arg link            Link object
 *
 * @return local address
 */
uint32_t rtnl_link_ipgre_get_local(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->local;
}
 
/**
 * Set IPGRE tunnel remote address
 * @arg link            Link object
 * @arg remote          remote address
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_remote(struct rtnl_link *link, uint32_t remote)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->remote = remote;
        ipgre->ipgre_mask |= IPGRE_ATTR_REMOTE;
 
        return 0;
}
 
/**
 * Get IPGRE tunnel remote address
 * @arg link            Link object
 *
 * @return remote address  on success or a negative error code
 */
uint32_t rtnl_link_ipgre_get_remote(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->remote;
}
 
/**
 * Set IPGRE tunnel ttl
 * @arg link            Link object
 * @arg ttl             tunnel ttl
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_ttl(struct rtnl_link *link, uint8_t ttl)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->ttl = ttl;
        ipgre->ipgre_mask |= IPGRE_ATTR_TTL;
 
        return 0;
}
 
/**
 * Set IPGRE tunnel ttl
 * @arg link            Link object
 *
 * @return ttl value
 */
uint8_t rtnl_link_ipgre_get_ttl(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->ttl;
}
 
/**
 * Set IPGRE tunnel tos
 * @arg link            Link object
 * @arg tos             tunnel tos
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_tos(struct rtnl_link *link, uint8_t tos)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->tos = tos;
        ipgre->ipgre_mask |= IPGRE_ATTR_TOS;
 
        return 0;
}
 
/**
 * Get IPGRE tunnel tos
 * @arg link            Link object
 *
 * @return tos value
 */
uint8_t rtnl_link_ipgre_get_tos(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->tos;
}
 
/**
 * Set IPGRE tunnel path MTU discovery
 * @arg link            Link object
 * @arg pmtudisc        path MTU discovery
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_pmtudisc(struct rtnl_link *link, uint8_t pmtudisc)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->pmtudisc = pmtudisc;
        ipgre->ipgre_mask |= IPGRE_ATTR_PMTUDISC;
 
        return 0;
}
 
/**
 * Get IPGRE path MTU discovery
 * @arg link            Link object
 *
 * @return pmtudisc value
 */
uint8_t rtnl_link_ipgre_get_pmtudisc(struct rtnl_link *link)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        return ipgre->pmtudisc;
}
 
/* Function prototype for ABI-preserving wrapper (not in public header) to avoid
 * GCC warning about missing prototype. */
uint8_t rtnl_link_get_pmtudisc(struct rtnl_link *link);
 
uint8_t rtnl_link_get_pmtudisc(struct rtnl_link *link)
{
        /* rtnl_link_ipgre_get_pmtudisc() was wrongly named. Keep this
         * to preserve ABI. */
        return rtnl_link_ipgre_get_pmtudisc (link);
}
 
/**
 * Set IPGRE tunnel fwmark
 * @arg link            Link object
 * @arg fwmark          fwmark
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_set_fwmark(struct rtnl_link *link, uint32_t fwmark)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        ipgre->fwmark = fwmark;
        ipgre->ipgre_mask |= IPGRE_ATTR_FWMARK;
 
        return 0;
}
 
/**
 * Get IPGRE tunnel fwmark
 * @arg link            Link object
 * @arg fwmark          addr to fill in with the fwmark
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipgre_get_fwmark(struct rtnl_link *link, uint32_t *fwmark)
{
        struct ipgre_info *ipgre = link->l_info;
 
        IS_IPGRE_LINK_ASSERT(link);
 
        if (!(ipgre->ipgre_mask & IPGRE_ATTR_FWMARK))
                return -NLE_NOATTR;
 
        *fwmark = ipgre->fwmark;
 
        return 0;
}
 
static void _nl_init ipgre_init(void)
{
        rtnl_link_register_info(&ipgre_info_ops);
        rtnl_link_register_info(&ipgretap_info_ops);
}
 
static void _nl_exit ipgre_exit(void)
{
        rtnl_link_unregister_info(&ipgre_info_ops);
        rtnl_link_unregister_info(&ipgretap_info_ops);
}