ipvti.c

/* SPDX-License-Identifier: LGPL-2.1-only */
/*
 * Copyright (c) 2014 Susant Sahani <susant@redhat.com>
 */
 
/**
 * @ingroup link
 * @defgroup ipvti IPVTI
 * ipvti link module
 *
 * @details
 * \b Link Type Name: "ipvti"
 *
 * @route_doc{link_ipvti, IPVTI Documentation}
 *
 * @{
 */
 
#include <netlink-private/netlink.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/ipvti.h>
#include <netlink-private/route/link/api.h>
#include <linux/if_tunnel.h>
 
#define IPVTI_ATTR_LINK          (1 << 0)
#define IPVTI_ATTR_IKEY          (1 << 1)
#define IPVTI_ATTR_OKEY          (1 << 2)
#define IPVTI_ATTR_LOCAL         (1 << 3)
#define IPVTI_ATTR_REMOTE        (1 << 4)
#define IPVTI_ATTR_FWMARK        (1 << 5)
 
struct ipvti_info
{
        uint32_t   link;
        uint32_t   ikey;
        uint32_t   okey;
        uint32_t   local;
        uint32_t   remote;
        uint32_t   fwmark;
        uint32_t   ipvti_mask;
};
 
static  struct nla_policy ipvti_policy[IFLA_VTI_MAX + 1] = {
        [IFLA_VTI_LINK]     = { .type = NLA_U32 },
        [IFLA_VTI_IKEY]     = { .type = NLA_U32 },
        [IFLA_VTI_OKEY]     = { .type = NLA_U32 },
        [IFLA_VTI_LOCAL]    = { .type = NLA_U32 },
        [IFLA_VTI_REMOTE]   = { .type = NLA_U32 },
        [IFLA_VTI_FWMARK]   = { .type = NLA_U32 },
};
 
static int ipvti_alloc(struct rtnl_link *link)
{
        struct ipvti_info *ipvti;
 
        if (link->l_info)
                memset(link->l_info, 0, sizeof(*ipvti));
        else {
                ipvti = calloc(1, sizeof(*ipvti));
                if (!ipvti)
                        return -NLE_NOMEM;
 
                link->l_info = ipvti;
        }
 
        return 0;
}
 
static int ipvti_parse(struct rtnl_link *link, struct nlattr *data,
                       struct nlattr *xstats)
{
        struct nlattr *tb[IFLA_VTI_MAX + 1];
        struct ipvti_info *ipvti;
        int err;
 
        NL_DBG(3, "Parsing IPVTI link info\n");
 
        err = nla_parse_nested(tb, IFLA_VTI_MAX, data, ipvti_policy);
        if (err < 0)
                goto errout;
 
        err = ipvti_alloc(link);
        if (err < 0)
                goto errout;
 
        ipvti = link->l_info;
 
        if (tb[IFLA_VTI_LINK]) {
                ipvti->link = nla_get_u32(tb[IFLA_VTI_LINK]);
                ipvti->ipvti_mask |= IPVTI_ATTR_LINK;
        }
 
        if (tb[IFLA_VTI_IKEY]) {
                ipvti->ikey = nla_get_u32(tb[IFLA_VTI_IKEY]);
                ipvti->ipvti_mask |= IPVTI_ATTR_IKEY;
        }
 
        if (tb[IFLA_VTI_OKEY]) {
                ipvti->okey = nla_get_u32(tb[IFLA_VTI_OKEY]);
                ipvti->ipvti_mask |= IPVTI_ATTR_OKEY;
        }
 
        if (tb[IFLA_VTI_LOCAL]) {
                ipvti->local = nla_get_u32(tb[IFLA_VTI_LOCAL]);
                ipvti->ipvti_mask |= IPVTI_ATTR_LOCAL;
        }
 
        if (tb[IFLA_VTI_REMOTE]) {
                ipvti->remote = nla_get_u32(tb[IFLA_VTI_REMOTE]);
                ipvti->ipvti_mask |= IPVTI_ATTR_REMOTE;
        }
 
        if (tb[IFLA_VTI_FWMARK]) {
                ipvti->fwmark = nla_get_u32(tb[IFLA_VTI_FWMARK]);
                ipvti->ipvti_mask |= IPVTI_ATTR_FWMARK;
        }
 
        err = 0;
 
errout:
        return err;
}
 
static int ipvti_put_attrs(struct nl_msg *msg, struct rtnl_link *link)
{
        struct ipvti_info *ipvti = link->l_info;
        struct nlattr *data;
 
        data = nla_nest_start(msg, IFLA_INFO_DATA);
        if (!data)
                return -NLE_MSGSIZE;
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_LINK)
                NLA_PUT_U32(msg, IFLA_VTI_LINK, ipvti->link);
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_IKEY)
                NLA_PUT_U32(msg, IFLA_VTI_IKEY, ipvti->ikey);
 
        if (ipvti->ipvti_mask & IFLA_VTI_IKEY)
                NLA_PUT_U32(msg, IFLA_VTI_OKEY, ipvti->okey);
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_LOCAL)
                NLA_PUT_U32(msg, IFLA_VTI_LOCAL, ipvti->local);
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_REMOTE)
                NLA_PUT_U32(msg, IFLA_VTI_REMOTE, ipvti->remote);
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_FWMARK)
                NLA_PUT_U32(msg, IFLA_VTI_FWMARK, ipvti->fwmark);
 
        nla_nest_end(msg, data);
 
nla_put_failure:
 
        return 0;
}
 
static void ipvti_free(struct rtnl_link *link)
{
        struct ipvti_info *ipvti = link->l_info;
 
        free(ipvti);
        link->l_info = NULL;
}
 
static void ipvti_dump_line(struct rtnl_link *link, struct nl_dump_params *p)
{
        nl_dump(p, "ipvti : %s", link->l_name);
}
 
static void ipvti_dump_details(struct rtnl_link *link, struct nl_dump_params *p)
{
        struct ipvti_info *ipvti = link->l_info;
        char *name, addr[INET_ADDRSTRLEN];
        struct rtnl_link *parent;
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_LINK) {
                nl_dump(p, "      link ");
 
                name = NULL;
                parent = link_lookup(link->ce_cache, ipvti->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", ipvti->link);
        }
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_IKEY) {
                nl_dump(p, "      ikey   ");
                nl_dump_line(p, "%x\n",ipvti->ikey);
        }
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_OKEY) {
                nl_dump(p, "      okey ");
                nl_dump_line(p, "%x\n", ipvti->okey);
        }
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_LOCAL) {
                nl_dump(p, "      local ");
                if(inet_ntop(AF_INET, &ipvti->local, addr, sizeof(addr)))
                        nl_dump_line(p, "%s\n", addr);
                else
                        nl_dump_line(p, "%#x\n", ntohs(ipvti->local));
        }
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_REMOTE) {
                nl_dump(p, "      remote ");
                if(inet_ntop(AF_INET, &ipvti->remote, addr, sizeof(addr)))
                        nl_dump_line(p, "%s\n", addr);
                else
                        nl_dump_line(p, "%#x\n", ntohs(ipvti->remote));
        }
 
        if (ipvti->ipvti_mask & IPVTI_ATTR_FWMARK) {
                nl_dump(p, "      fwmark ");
                nl_dump_line(p, "%x\n", ipvti->fwmark);
        }
}
 
static int ipvti_clone(struct rtnl_link *dst, struct rtnl_link *src)
{
        struct ipvti_info *ipvti_dst, *ipvti_src = src->l_info;
        int err;
 
        dst->l_info = NULL;
 
        err = rtnl_link_set_type(dst, "vti");
        if (err < 0)
                return err;
 
        ipvti_dst = dst->l_info;
 
        if (!ipvti_dst || !ipvti_src)
                BUG();
 
        memcpy(ipvti_dst, ipvti_src, sizeof(struct ipvti_info));
 
        return 0;
}
 
static struct rtnl_link_info_ops ipvti_info_ops = {
        .io_name                = "vti",
        .io_alloc               = ipvti_alloc,
        .io_parse               = ipvti_parse,
        .io_dump = {
                [NL_DUMP_LINE]  = ipvti_dump_line,
                [NL_DUMP_DETAILS] = ipvti_dump_details,
        },
        .io_clone               = ipvti_clone,
        .io_put_attrs           = ipvti_put_attrs,
        .io_free                = ipvti_free,
};
 
#define IS_IPVTI_LINK_ASSERT(link)                                          \
        if ((link)->l_info_ops != &ipvti_info_ops) {                        \
                APPBUG("Link is not a ipvti link. set type \vti\" first."); \
                return -NLE_OPNOTSUPP;                                      \
        }
 
struct rtnl_link *rtnl_link_ipvti_alloc(void)
{
        struct rtnl_link *link;
        int err;
 
        link = rtnl_link_alloc();
        if (!link)
                return NULL;
 
        err = rtnl_link_set_type(link, "vti");
        if (err < 0) {
                rtnl_link_put(link);
                return NULL;
        }
 
        return link;
}
 
/**
 * Check if link is a IPVTI link
 * @arg link            Link object
 *
 * @return True if link is a IPVTI link, otherwise 0 is returned.
 */
int rtnl_link_is_ipvti(struct rtnl_link *link)
{
        return link->l_info_ops && !strcmp(link->l_info_ops->io_name, "vti");
}
/**
 * Create a new ipvti tunnel device
 * @arg sock            netlink socket
 * @arg name            name of the tunnel deviceL
 *
 * Creates a new ipvti tunnel device in the kernel
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipvti_add(struct nl_sock *sk, const char *name)
{
        struct rtnl_link *link;
        int err;
 
        link = rtnl_link_ipvti_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 IPVTI tunnel interface index
 * @arg link            Link object
 * @arg index           interface index
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipvti_set_link(struct rtnl_link *link, uint32_t index)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        ipvti->link = index;
        ipvti->ipvti_mask |= IPVTI_ATTR_LINK;
 
        return 0;
}
 
/**
 * Get IPVTI tunnel interface index
 * @arg link            Link object
 *
 * @return interface index
 */
uint32_t rtnl_link_ipvti_get_link(struct rtnl_link *link)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        return ipvti->link;
}
 
/**
 * Set IPVTI tunnel set ikey
 * @arg link            Link object
 * @arg ikey            gre ikey
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipvti_set_ikey(struct rtnl_link *link, uint32_t ikey)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        ipvti->ikey = ikey;
        ipvti->ipvti_mask |= IPVTI_ATTR_IKEY;
 
        return 0;
}
 
/**
 * Get IPVTI tunnel ikey
 * @arg link            Link object
 *
 * @return ikey
 */
uint32_t rtnl_link_ipvti_get_ikey(struct rtnl_link *link)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        return ipvti->ikey;
}
 
/**
 * Set IPVTI tunnel set okey
 * @arg link            Link object
 * @arg okey            gre okey
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipvti_set_okey(struct rtnl_link *link, uint32_t okey)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        ipvti->okey = okey;
        ipvti->ipvti_mask |= IPVTI_ATTR_OKEY;
 
        return 0;
}
 
/**
 * Get IPVTI tunnel okey
 * @arg link            Link object
 *
 * @return okey value
 */
uint32_t rtnl_link_ipvti_get_okey(struct rtnl_link *link)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        return ipvti->okey;
}
 
/**
 * Set IPVTI tunnel local address
 * @arg link            Link object
 * @arg addr            local address
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipvti_set_local(struct rtnl_link *link, uint32_t addr)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        ipvti->local = addr;
        ipvti->ipvti_mask |= IPVTI_ATTR_LOCAL;
 
        return 0;
}
 
/**
 * Get IPVTI tunnel local address
 * @arg link            Link object
 *
 * @return local address
 */
uint32_t rtnl_link_ipvti_get_local(struct rtnl_link *link)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        return ipvti->local;
}
 
/**
 * Set IPVTI tunnel remote address
 * @arg link            Link object
 * @arg remote          remote address
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipvti_set_remote(struct rtnl_link *link, uint32_t remote)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        ipvti->remote = remote;
        ipvti->ipvti_mask |= IPVTI_ATTR_REMOTE;
 
        return 0;
}
 
/**
 * Get IPVTI tunnel remote address
 * @arg link            Link object
 *
 * @return remote address  on success or a negative error code
 */
uint32_t rtnl_link_ipvti_get_remote(struct rtnl_link *link)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        return ipvti->remote;
}
 
/**
 * Set IPVTI tunnel fwmark
 * @arg link            Link object
 * @arg fwmark          fwmark
 *
 * @return 0 on success or a negative error code
 */
int rtnl_link_ipvti_set_fwmark(struct rtnl_link *link, uint32_t fwmark)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        ipvti->fwmark = fwmark;
        ipvti->ipvti_mask |= IPVTI_ATTR_FWMARK;
 
        return 0;
}
 
/**
 * Get IPVTI 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_ipvti_get_fwmark(struct rtnl_link *link, uint32_t *fwmark)
{
        struct ipvti_info *ipvti = link->l_info;
 
        IS_IPVTI_LINK_ASSERT(link);
 
        if (!(ipvti->ipvti_mask & IPVTI_ATTR_FWMARK))
                return -NLE_NOATTR;
 
        *fwmark = ipvti->fwmark;
 
        return 0;
}
 
static void __init ipvti_init(void)
{
        rtnl_link_register_info(&ipvti_info_ops);
}
 
static void __exit ipvti_exit(void)
{
        rtnl_link_unregister_info(&ipvti_info_ops);
}