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netlink.cpp
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/*
* The MIT License (MIT)
*
* Copyright (c) 2016 Federico Stella <[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <iostream>
#include <chrono>
#include <thread>
#include <locale>
#include <clocale>
#include <iomanip>
#include <ctime>
#include <tuple>
#include <deque>
#include <unistd.h>
#include <net/if.h>
#include <linux/if.h>
#include <linux/if_link.h>
#include <linux/rtnetlink.h>
#include <uv.h>
#include <libmnl/libmnl.h>
#include "json.hpp"
#include "streaming-worker.h"
using json = nlohmann::json;
#define my_attr_for_each(attr, nlh, offset) for ((attr) = (const nlattr *) mnl_nlmsg_get_payload_offset((nlh), (offset)); \
mnl_attr_ok((attr), (char *)mnl_nlmsg_get_payload_tail(nlh) - (char *)(attr)); \
(attr) = mnl_attr_next(attr))
/*
* Missing constant in glibc
*/
const unsigned int IFF_LOWER_UP = 1 << 16;
const unsigned int IFF_DORMANT = 1 << 17;
const unsigned int IFF_ECHO = 1 << 18;
std::string get_iso8601_timestamp()
{
std::ostringstream buffer;
auto now = std::chrono::system_clock::now();
auto milli = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()).count() % 1000;
auto now_c = std::chrono::system_clock::to_time_t(now);
buffer << std::put_time(std::gmtime(&now_c), "%FT%T") << '.' << std::setfill('0') << std::setw(3) << milli << 'Z';
return buffer.str();
}
using namespace std;
class Netlink;
struct cbdata {
Netlink * self;
const AsyncProgressWorker::ExecutionProgress& progress;
};
class Netlink: public StreamingWorker
{
public:
typedef std::tuple<int, json> callback_return_json_type;
typedef AsyncProgressWorker::ExecutionProgress progress_type;
Netlink(Callback *data, Callback *complete, Callback *error_callback, v8::Local<v8::Object> & options)
: StreamingWorker(data, complete, error_callback), seq_(0) {
if (!(nl_ = mnl_socket_open(NETLINK_ROUTE))) {
SetErrorMessage("Cannot create NETLINK_ROUTE socket");
return;
}
portid_ = MNL_SOCKET_AUTOPID;
if (mnl_socket_bind(nl_, RTMGRP_LINK | RTMGRP_IPV4_ROUTE | RTMGRP_IPV6_ROUTE | RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR, portid_) < 0) {
SetErrorMessage("Cannot bind libmnl socket");
return;
}
}
bool need_async() const
{
return true;
}
void Execute(const progress_type& progress) {
loop_ = uv_loop_new();
async_.data = this;
uv_async_init(loop_, &async_, [](uv_async_t * a) {
auto self = reinterpret_cast<Netlink *>(a->data);
self->drain_queue();
});
uv_poll_init_socket(loop_, &poll_handle_, mnl_socket_get_fd(nl_));
// XXX: we need to pass this and progress through the callback
struct cbdata cb = { this, progress };
poll_handle_.data = &cb;
uv_poll_start(&poll_handle_, UV_READABLE /*| UV_DISCONNECT*/, [](uv_poll_t * h, int s, int e) {
auto self = ((struct cbdata *) h->data)->self;
self->pollcb(((struct cbdata *) h->data)->progress, h, s, e);
});
uv_run(loop_, UV_RUN_DEFAULT);
}
/*
* hack to receive message from javascript because the loop is watching netlink fd.
*/
void drain_queue()
{
std::deque<Message> queue;
fromNode.readAll(queue);
for (auto m: queue) {
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr * nlh;
if (m.name == "get_route") {
nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = RTM_GETROUTE;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
nlh->nlmsg_seq = ++seq_;
struct rtmsg * rtm = reinterpret_cast<struct rtmsg *>(mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtmsg)));
if (m.data == "ipv4")
rtm->rtm_family = AF_INET;
else
rtm->rtm_family = AF_INET6;
mnl_socket_sendto(nl_, nlh, nlh->nlmsg_len);
} else if (m.name == "get_addr") {
nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = RTM_GETADDR;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
nlh->nlmsg_seq = ++seq_;
struct rtgenmsg* rt = reinterpret_cast<struct rtgenmsg*>(mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtgenmsg)));
if (m.data == "ipv4")
rt->rtgen_family = AF_INET;
else
rt->rtgen_family = AF_INET6;
mnl_socket_sendto(nl_, nlh, nlh->nlmsg_len);
} else if (m.name == "get_link") {
nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = RTM_GETLINK;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
nlh->nlmsg_seq = ++seq_;
struct rtgenmsg* rt = reinterpret_cast<struct rtgenmsg*>(mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtgenmsg)));
rt->rtgen_family = AF_PACKET;
mnl_socket_sendto(nl_, nlh, nlh->nlmsg_len);
} else if (m.name == "stop_loop") {
uv_stop(loop_);
}
}
}
void pollcb(const progress_type & progress, uv_poll_t * handle, int status, int events)
{
char buf[MNL_SOCKET_BUFFER_SIZE];
//printf("Pollcb Status %d events: %d\n", status, events);
if (events == UV_READABLE) {
int ret = mnl_socket_recvfrom(nl_, buf, sizeof(buf));
struct cbdata cb = { this, progress };
ret = mnl_cb_run(buf, ret, 0, portid_, [](const struct nlmsghdr *nlh, void * data) -> int {
auto self = ((struct cbdata *) data)->self;
return self->data_cb(nlh, ((struct cbdata *) data)->progress);
}, &cb);
//} else if (events == UV_DISCONNECT) {
}
}
int data_cb(const struct nlmsghdr *nlh, const progress_type & progress)
{
int retval = MNL_CB_OK;
json j;
//printf("Datacb: %d\n", nlh->nlmsg_type);
switch (nlh->nlmsg_type) {
case RTM_NEWROUTE:
case RTM_DELROUTE:
case RTM_GETROUTE: {
std::tie(retval, j) = data_route_cb(nlh);
Message tosend("route", j.dump());
writeToNode(progress, tosend);
break;
}
case RTM_NEWLINK:
case RTM_DELLINK:
case RTM_GETLINK: {
std::tie(retval, j) = data_link_cb(nlh);
Message tosend("link", j.dump());
writeToNode(progress, tosend);
break;
}
case RTM_NEWADDR:
case RTM_DELADDR:
case RTM_GETADDR: {
std::tie(retval, j) = data_addr_cb(nlh);
Message tosend("addr", j.dump());
writeToNode(progress, tosend);
break;
}
}
return retval;
}
int data_addr_attr_cb(const struct nlattr *attr, void * data)
{
const struct nlattr **tb = reinterpret_cast<const struct nlattr **>(data);
int type = mnl_attr_get_type(attr);
/* skip unsupported attribute in user-space */
if (mnl_attr_type_valid(attr, IFA_MAX) < 0)
return MNL_CB_OK;
switch (type) {
case IFA_LABEL:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) {
//perror("mnl_addr_validate");
return MNL_CB_ERROR;
}
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
int data_attr_cb(const struct nlattr *attr, void * data)
{
const struct nlattr **tb = reinterpret_cast<const struct nlattr **>(data);
int type = mnl_attr_get_type(attr);
/* skip unsupported attribute in user-space */
if (mnl_attr_type_valid(attr, IFLA_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case IFLA_MTU:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
return MNL_CB_ERROR;
break;
case IFLA_IFNAME:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
return MNL_CB_ERROR;
break;
case IFLA_LINK:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
return MNL_CB_ERROR;
break;
case IFLA_QDISC:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
return MNL_CB_ERROR;
break;
case IFLA_TXQLEN:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
return MNL_CB_ERROR;
break;
case IFLA_OPERSTATE:
if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
return MNL_CB_ERROR;
break;
case IFLA_LINKMODE:
if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
return MNL_CB_ERROR;
break;
case IFLA_IFALIAS:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
return MNL_CB_ERROR;
break;
case IFLA_STATS64:
if (mnl_attr_validate2(attr, MNL_TYPE_UNSPEC, sizeof(struct rtnl_link_stats64)) < 0)
return MNL_CB_ERROR;
break;
case IFLA_GROUP:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
return MNL_CB_ERROR;
break;
case IFLA_NUM_TX_QUEUES:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
return MNL_CB_ERROR;
break;
case IFLA_NUM_RX_QUEUES:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
return MNL_CB_ERROR;
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int data_attr_cb2(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = reinterpret_cast<const struct nlattr **>(data);
/* skip unsupported attribute in user-space */
if (mnl_attr_type_valid(attr, RTAX_MAX) < 0)
return MNL_CB_OK;
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
//perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
tb[mnl_attr_get_type(attr)] = attr;
return MNL_CB_OK;
}
callback_return_json_type data_addr_cb(const struct nlmsghdr *nlh)
{
struct nlattr *tb[IFA_MAX+1] = {};
struct ifaddrmsg *ifa = reinterpret_cast<struct ifaddrmsg *>(mnl_nlmsg_get_payload(nlh));
json ret;
ret["type"] = "addr";
ret["event"] = nlh->nlmsg_type == RTM_NEWADDR ? (nlh->nlmsg_seq ? "get" : "new") : "delete";
ret["timestamp"] = get_iso8601_timestamp();
ret["data"]["family"] = ifa->ifa_family == AF_INET ? "ipv4" : "ipv6";
ret["data"]["prefixlen"] = ifa->ifa_prefixlen;
ret["data"]["flags"] = [&]() -> std::vector<std::string> {
std::vector<std::string> flags;
if (ifa->ifa_flags & IFA_F_SECONDARY)
flags.push_back("secondary");
if (ifa->ifa_flags & IFA_F_NODAD)
flags.push_back("nodad");
if (ifa->ifa_flags & IFA_F_OPTIMISTIC)
flags.push_back("optimistic");
if (ifa->ifa_flags & IFA_F_DADFAILED)
flags.push_back("dadfailed");
if (ifa->ifa_flags & IFA_F_HOMEADDRESS)
flags.push_back("homeaddress");
if (ifa->ifa_flags & IFA_F_DEPRECATED)
flags.push_back("deprecated");
if (ifa->ifa_flags & IFA_F_TENTATIVE)
flags.push_back("tentative");
if (ifa->ifa_flags & IFA_F_PERMANENT)
flags.push_back("permanent");
if (ifa->ifa_flags & IFA_F_MANAGETEMPADDR)
flags.push_back("managetempaddr");
if (ifa->ifa_flags & IFA_F_NOPREFIXROUTE)
flags.push_back("noprefixroute");
if (ifa->ifa_flags & IFA_F_MCAUTOJOIN )
flags.push_back("mcautojoin");
if (ifa->ifa_flags & IFA_F_STABLE_PRIVACY)
flags.push_back("stableprivacy");
return flags;
}();
ret["data"]["scope"] = [&]() -> std::string {
switch (ifa->ifa_scope) {
case RT_SCOPE_UNIVERSE: return "universe";
case RT_SCOPE_SITE: return "site";
case RT_SCOPE_LINK: return "link";
case RT_SCOPE_HOST: return "host";
case RT_SCOPE_NOWHERE: return "nowhere";
default: return std::string("user:") + std::to_string(ifa->ifa_scope);
}
}();
char buf[IF_NAMESIZE + 1];
ret["data"]["if"] = std::string(if_indextoname(ifa->ifa_index, &buf[0]));
// XXX: create do_addr_parse
do_addr_parse(nlh, sizeof(*ifa), tb);
if (tb[IFA_LABEL]) {
ret["data"]["label"] = std::string(mnl_attr_get_str(tb[IFA_LABEL]));
}
if (tb[IFA_ADDRESS]) {
if (ifa->ifa_family == AF_INET) {
char buf2[INET_ADDRSTRLEN];
struct in_addr * addr = reinterpret_cast<struct in_addr *>(mnl_attr_get_payload(tb[IFA_ADDRESS]));
inet_ntop(AF_INET, addr, buf2, INET_ADDRSTRLEN);
ret["data"]["addr"] = std::string(buf2);
} else {
char buf2[INET6_ADDRSTRLEN];
struct in6_addr * addr = reinterpret_cast<struct in6_addr *>(mnl_attr_get_payload(tb[IFA_ADDRESS]));
inet_ntop(AF_INET6, addr, buf2, INET6_ADDRSTRLEN);
ret["data"]["addr"] = std::string(buf2);
}
}
if (tb[IFA_BROADCAST]) {
if (ifa->ifa_family == AF_INET) {
char buf2[INET_ADDRSTRLEN];
struct in_addr * addr = reinterpret_cast<struct in_addr *>(mnl_attr_get_payload(tb[IFA_BROADCAST]));
inet_ntop(AF_INET, addr, buf2, INET_ADDRSTRLEN);
ret["data"]["broadcast"] = std::string(buf2);
} else {
char buf2[INET6_ADDRSTRLEN];
struct in6_addr * addr = reinterpret_cast<struct in6_addr *>(mnl_attr_get_payload(tb[IFA_BROADCAST]));
inet_ntop(AF_INET6, addr, buf2, INET6_ADDRSTRLEN);
ret["data"]["broadcast"] = std::string(buf2);
}
}
return std::make_tuple(MNL_CB_OK, ret);
}
callback_return_json_type data_link_cb(const struct nlmsghdr *nlh)
{
struct nlattr *tb[IFLA_MAX+1] = {};
struct ifinfomsg *ifm = reinterpret_cast<struct ifinfomsg *>(mnl_nlmsg_get_payload(nlh));
json ret;
/*
printf("index=%d type=%d flags=%d family=%d ",
ifm->ifi_index, ifm->ifi_type,
ifm->ifi_flags, ifm->ifi_family);
*/
ret["data"]["index"] = ifm->ifi_index;
ret["data"]["type"] = ifm->ifi_type;
ret["data"]["flags"] = [&]() -> std::vector<std::string> {
std::vector<std::string> flags;
if (ifm->ifi_flags & IFF_UP)
flags.push_back("up");
if (ifm->ifi_flags & IFF_BROADCAST)
flags.push_back("broadcast");
if (ifm->ifi_flags & IFF_DEBUG)
flags.push_back("debug");
if (ifm->ifi_flags & IFF_LOOPBACK)
flags.push_back("loopback");
if (ifm->ifi_flags & IFF_POINTOPOINT)
flags.push_back("pointtopoint");
if (ifm->ifi_flags & IFF_NOTRAILERS)
flags.push_back("notrailers");
if (ifm->ifi_flags & IFF_RUNNING)
flags.push_back("running");
if (ifm->ifi_flags & IFF_NOARP)
flags.push_back("noarp");
if (ifm->ifi_flags & IFF_PROMISC)
flags.push_back("promisc");
if (ifm->ifi_flags & IFF_ALLMULTI)
flags.push_back("allmulti");
if (ifm->ifi_flags & IFF_MASTER)
flags.push_back("master");
if (ifm->ifi_flags & IFF_SLAVE)
flags.push_back("slave");
if (ifm->ifi_flags & IFF_MULTICAST)
flags.push_back("multicast");
if (ifm->ifi_flags & IFF_PORTSEL)
flags.push_back("portsel");
if (ifm->ifi_flags & IFF_AUTOMEDIA)
flags.push_back("automedia");
if (ifm->ifi_flags & IFF_DYNAMIC)
flags.push_back("dynamic");
if (ifm->ifi_flags & IFF_LOWER_UP)
flags.push_back("lowerup");
if (ifm->ifi_flags & IFF_DORMANT)
flags.push_back("dormant");
if (ifm->ifi_flags & IFF_ECHO)
flags.push_back("echo");
return flags;
}();
ret["data"]["family"] = ifm->ifi_family;
if (ifm->ifi_flags & IFF_RUNNING) {
ret["data"]["running"] = true;
} else {
ret["data"]["running"] = false;
}
if (ifm->ifi_flags & IFF_UP) {
ret["data"]["up"] = true;
} else {
ret["data"]["up"] = false;
}
/*
do_attr_parse(nlh, sizeof(*ifm), [&](const struct nlattr *attr, void * data) -> int {
ret["data"]urn data_attr_cb(attr, data);
}, tb
);
*/
do_attr_parse(nlh, sizeof(*ifm), tb);
if (tb[IFLA_MTU])
ret["data"]["mtu"] = mnl_attr_get_u32(tb[IFLA_MTU]);
if (tb[IFLA_IFNAME])
ret["data"]["name"] = std::string(mnl_attr_get_str(tb[IFLA_IFNAME]));
if (tb[IFLA_LINK])
ret["data"]["link"] = mnl_attr_get_u32(tb[IFLA_LINK]);
if (tb[IFLA_QDISC])
ret["data"]["qdisc"] = std::string(mnl_attr_get_str(tb[IFLA_QDISC]));
if (tb[IFLA_TXQLEN])
ret["data"]["txqlen"] = mnl_attr_get_u32(tb[IFLA_TXQLEN]);
if (tb[IFLA_OPERSTATE])
ret["data"]["operstate"] = mnl_attr_get_u8(tb[IFLA_OPERSTATE]);
if (tb[IFLA_LINKMODE])
ret["data"]["linkmode"] = mnl_attr_get_u8(tb[IFLA_LINKMODE]);
if (tb[IFLA_IFALIAS])
ret["data"]["ifalias"] = std::string(mnl_attr_get_str(tb[IFLA_IFALIAS]));
if (tb[IFLA_STATS64]) {
struct rtnl_link_stats64 * link_stats;
link_stats = reinterpret_cast<struct rtnl_link_stats64 *>(mnl_attr_get_payload(tb[IFLA_STATS64]));
json stats;
stats["rx_packets"] = link_stats->rx_packets;
stats["tx_packets"] = link_stats->tx_packets;
stats["rx_bytes"] = link_stats->rx_bytes;
stats["tx_bytes"] = link_stats->tx_bytes;
stats["rx_errors"] = link_stats->rx_errors;
stats["tx_errors"] = link_stats->tx_errors;
stats["rx_dropped"] = link_stats->rx_dropped;
stats["tx_dropped"] = link_stats->tx_dropped;
stats["multicast"] = link_stats->multicast;
stats["collisions"] = link_stats->collisions;
stats["rx_compressed"] = link_stats->rx_compressed;
stats["tx_compressed"] = link_stats->tx_compressed;
stats["rx_nohandler"] = link_stats->rx_nohandler;
json rx_err;
rx_err["length"] = link_stats->rx_length_errors;
rx_err["over"] = link_stats->rx_over_errors;
rx_err["crc"] = link_stats->rx_crc_errors;
rx_err["frame"] = link_stats->rx_frame_errors;
rx_err["fifo"] = link_stats->rx_fifo_errors;
rx_err["missed"] = link_stats->rx_missed_errors;
stats["rx_errors"] = rx_err;
json tx_err;
tx_err["aborted"] = link_stats->tx_aborted_errors;
tx_err["carrier"] = link_stats->tx_carrier_errors;
tx_err["fifo"] = link_stats->tx_fifo_errors;
tx_err["heartbeat"] = link_stats->tx_heartbeat_errors;
tx_err["window"] = link_stats->tx_window_errors;
stats["tx_errors"] = tx_err;
ret["data"]["stats"] = stats;
}
if (tb[IFLA_GROUP])
ret["data"]["linkmode"] = mnl_attr_get_u32(tb[IFLA_GROUP]);
if (tb[IFLA_NUM_TX_QUEUES])
ret["data"]["num_tx_queues"] = mnl_attr_get_u32(tb[IFLA_NUM_TX_QUEUES]);
if (tb[IFLA_NUM_RX_QUEUES])
ret["data"]["num_rx_queues"] = mnl_attr_get_u32(tb[IFLA_NUM_RX_QUEUES]);
ret["type"] = "link";
ret["event"] = nlh->nlmsg_type == RTM_NEWLINK ? (nlh->nlmsg_seq ? "get" : "new") : "delete";
ret["timestamp"] = get_iso8601_timestamp();
return std::make_tuple(MNL_CB_OK, ret);
}
callback_return_json_type data_route_cb(const struct nlmsghdr *nlh)
{
struct nlattr *tb[RTA_MAX+1] = {};
struct rtmsg *rm = reinterpret_cast<struct rtmsg *>(mnl_nlmsg_get_payload(nlh));
json reply;
reply["type"] = "route";
reply["timestamp"] = get_iso8601_timestamp();
reply["event"] = nlh->nlmsg_type == RTM_NEWROUTE ? (nlh->nlmsg_seq ? "get" : "new") : "delete";
/* protocol family = AF_INET | AF_INET6 */
reply["data"]["family"] = rm->rtm_family == AF_INET ? "ipv4" : "ipv6";
/* destination CIDR, eg. 24 or 32 for IPv4 */
reply["data"]["dst_len"] = rm->rtm_dst_len;
/* source CIDR */
reply["data"]["src_len"] = rm->rtm_src_len;
/* type of service (TOS), eg. 0 */
reply["data"]["tos"] = rm->rtm_tos;
/* table id:
* RT_TABLE_UNSPEC = 0
*
* ... user defined values ...
*
* RT_TABLE_COMPAT = 252
* RT_TABLE_DEFAULT = 253
* RT_TABLE_MAIN = 254
* RT_TABLE_LOCAL = 255
* RT_TABLE_MAX = 0xFFFFFFFF
*
* Synonimous attribute: RTA_TABLE.
*/
reply["data"]["table"] = [&]() -> std::string {
switch (rm->rtm_table) {
case RT_TABLE_UNSPEC: return "unspec";
case RT_TABLE_COMPAT: return "compat";
case RT_TABLE_DEFAULT: return "default";
case RT_TABLE_MAIN: return "main";
case RT_TABLE_LOCAL: return "local";
default: return std::string("user:") + std::to_string(rm->rtm_table);
}
}();
/* type:
* RTN_UNSPEC = 0
* RTN_UNICAST = 1
* RTN_LOCAL = 2
* RTN_BROADCAST = 3
* RTN_ANYCAST = 4
* RTN_MULTICAST = 5
* RTN_BLACKHOLE = 6
* RTN_UNREACHABLE = 7
* RTN_PROHIBIT = 8
* RTN_THROW = 9
* RTN_NAT = 10
* RTN_XRESOLVE = 11
* __RTN_MAX = 12
*/
reply["data"]["type"] = [&]() {
switch(rm->rtm_type) {
case RTN_UNSPEC: return "unspec";
case RTN_UNICAST: return "unicast";
case RTN_LOCAL: return "local";
case RTN_BROADCAST: return "broadcast";
case RTN_ANYCAST: return "anycast";
case RTN_MULTICAST: return "multicast";
case RTN_BLACKHOLE: return "blackhole";
case RTN_UNREACHABLE: return "unreacheable";
case RTN_PROHIBIT: return "prohibit";
case RTN_THROW: return "throw";
case RTN_NAT: return "nat";
case RTN_XRESOLVE: return "xresolve";
default: return "unspec";
}
}();
/* scope:
* RT_SCOPE_UNIVERSE = 0 : everywhere in the universe
*
* ... user defined values ...
*
* RT_SCOPE_SITE = 200
* RT_SCOPE_LINK = 253 : destination attached to link
* RT_SCOPE_HOST = 254 : local address
* RT_SCOPE_NOWHERE = 255 : not existing destination
*/
reply["data"]["scope"] = [&]() -> std::string {
switch (rm->rtm_scope) {
case RT_SCOPE_UNIVERSE: return "universe";
case RT_SCOPE_SITE: return "site";
case RT_SCOPE_LINK: return "link";
case RT_SCOPE_HOST: return "host";
case RT_SCOPE_NOWHERE: return "nowhere";
default: return std::string("user:") + std::to_string(rm->rtm_scope);
}
}();
/* protocol:
* RTPROT_UNSPEC = 0
* RTPROT_REDIRECT = 1
* RTPROT_KERNEL = 2 : route installed by kernel
* RTPROT_BOOT = 3 : route installed during boot
* RTPROT_STATIC = 4 : route installed by administrator
*
* Values >= RTPROT_STATIC are not interpreted by kernel, they are
* just user-defined.
*/
reply["data"]["proto"] = [&]() -> std::string {
switch (rm->rtm_protocol) {
case RTPROT_UNSPEC: return "unspec";
case RTPROT_REDIRECT: return "redirect";
case RTPROT_KERNEL: return "kernel";
case RTPROT_BOOT: return "boot";
case RTPROT_STATIC: return "static";
default: return std::string("user:") + std::to_string(rm->rtm_protocol);
}
}();
/* flags:
* RTM_F_NOTIFY = 0x100: notify user of route change
* RTM_F_CLONED = 0x200: this route is cloned
* RTM_F_EQUALIZE = 0x400: Multipath equalizer: NI
* RTM_F_PREFIX = 0x800: Prefix addresses
*/
reply["data"]["flags"] = [&]() -> std::vector<std::string> {
std::vector<std::string> flags;
if (rm->rtm_flags & RTM_F_NOTIFY)
flags.push_back("notify");
if (rm->rtm_flags & RTM_F_CLONED)
flags.push_back("cloned");
if (rm->rtm_flags & RTM_F_EQUALIZE)
flags.push_back("equalize");
if (rm->rtm_flags & RTM_F_PREFIX)
flags.push_back("prefix");
if (rm->rtm_flags & RTM_F_LOOKUP_TABLE)
flags.push_back("lookup");
return flags;
}();
switch(rm->rtm_family) {
case AF_INET:
do_attr_ipv4_parse(nlh, sizeof(*rm), tb);
reply["data"]["addr"] = attributes_show_ipv4(tb);
break;
case AF_INET6:
do_attr_ipv6_parse(nlh, sizeof(*rm), tb);
reply["data"]["addr"] = attributes_show_ipv6(tb);
break;
}
return std::make_tuple(MNL_CB_OK, reply);
}
int data_ipv4_attr_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = reinterpret_cast<const struct nlattr **>(data);
int type = mnl_attr_get_type(attr);
/* skip unsupported attribute in user-space */
if (mnl_attr_type_valid(attr, RTA_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case RTA_TABLE:
case RTA_DST:
case RTA_SRC:
case RTA_OIF:
case RTA_FLOW:
case RTA_PREFSRC:
case RTA_GATEWAY:
case RTA_PRIORITY:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
//perror("mnl_attr_validate3");
return MNL_CB_ERROR;
}
break;
case RTA_METRICS:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0) {
//perror("mnl_attr_validate4");
return MNL_CB_ERROR;
}
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
int data_ipv6_attr_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = reinterpret_cast<const struct nlattr **>(data);
int type = mnl_attr_get_type(attr);
/* skip unsupported attribute in user-space */
if (mnl_attr_type_valid(attr, RTA_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case RTA_TABLE:
case RTA_OIF:
case RTA_FLOW:
case RTA_PRIORITY:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
//perror("mnl_attr_validate5");
return MNL_CB_ERROR;
}
break;
case RTA_DST:
case RTA_SRC:
case RTA_PREFSRC:
case RTA_GATEWAY:
if (mnl_attr_validate2(attr, MNL_TYPE_BINARY,
sizeof(struct in6_addr)) < 0) {
//perror("mnl_attr_validate6");
return MNL_CB_ERROR;
}
break;
case RTA_METRICS:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0) {
//perror("mnl_attr_validate7");
return MNL_CB_ERROR;
}
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
json attributes_show_ipv4(struct nlattr *tb[])
{
char buf[INET_ADDRSTRLEN];
json ret;
if (tb[RTA_TABLE]) {
ret["table"] = [&]() -> std::string {
int table = mnl_attr_get_u32(tb[RTA_TABLE]);
switch (table) {
case RT_TABLE_UNSPEC: return "unspec";
case RT_TABLE_COMPAT: return "compat";
case RT_TABLE_DEFAULT: return "default";
case RT_TABLE_MAIN: return "main";
case RT_TABLE_LOCAL: return "local";
default: return std::string("user:") + std::to_string(table);
}
}();
}
if (tb[RTA_DST]) {
struct in_addr *addr = reinterpret_cast<struct in_addr *>(mnl_attr_get_payload(tb[RTA_DST]));
inet_ntop(AF_INET, addr, buf, INET_ADDRSTRLEN);
ret["dst"] = std::string(buf);
}
if (tb[RTA_SRC]) {
struct in_addr *addr = reinterpret_cast<struct in_addr *>(mnl_attr_get_payload(tb[RTA_SRC]));
inet_ntop(AF_INET, addr, buf, INET_ADDRSTRLEN);
ret["src"] = std::string(buf);
}
if (tb[RTA_OIF]) {
char buf[IF_NAMESIZE + 1];
ret["oif"] = std::string(if_indextoname(mnl_attr_get_u32(tb[RTA_OIF]), &buf[0]));
}
if (tb[RTA_FLOW]) {
ret["flow"] = mnl_attr_get_u32(tb[RTA_FLOW]);
}
if (tb[RTA_PREFSRC]) {
struct in_addr *addr = reinterpret_cast<struct in_addr *>(mnl_attr_get_payload(tb[RTA_PREFSRC]));
inet_ntop(AF_INET, addr, buf, INET_ADDRSTRLEN);
ret["prefsrc"] = std::string(buf);
}
if (tb[RTA_GATEWAY]) {
struct in_addr *addr = reinterpret_cast<struct in_addr *>(mnl_attr_get_payload(tb[RTA_GATEWAY]));
inet_ntop(AF_INET, addr, buf, INET_ADDRSTRLEN);
ret["gw"] = std::string(buf);
}
if (tb[RTA_PRIORITY]) {
ret["prio"] = mnl_attr_get_u32(tb[RTA_PRIORITY]);
}
/*
if (tb[RTA_METRICS]) {
struct nlattr * tbx[RTAX_MAX + 1] = {};
mnl_attr_parse_nested(tb[RTA_METRICS], data_attr_cb2, tbx);
if (tbx[RTAX_MTU])
ret["metrics"]["mtu"] = mnl_attr_get_u32(tbx[RTAX_MTU]);
if (tbx[RTAX_WINDOW])
ret["metrics"]["window"] = mnl_attr_get_u32(tbx[RTAX_WINDOW]);
if (tbx[RTAX_RTT])
ret["metrics"]["rtt"] = mnl_attr_get_u32(tbx[RTAX_RTT]);
if (tbx[RTAX_CWND])
ret["metrics"]["cwnd"] = mnl_attr_get_u32(tbx[RTAX_CWND]);
if (tbx[RTAX_HOPLIMIT])
ret["metrics"]["hoplimit"] = mnl_attr_get_u32(tbx[RTAX_HOPLIMIT]);
for (int i = 0; i < RTAX_MAX; i++) {
if (tbx[i]) {
printf("----------->>>>>>>>>> metrics[%d]=%u ", i, mnl_attr_get_u32(tbx[i]));
}
}
}
*/
return ret;
}
json attributes_show_ipv6(struct nlattr *tb[])
{
char buf[INET6_ADDRSTRLEN];
json ret;
if (tb[RTA_TABLE]) {
//printf("table=%u ", mnl_attr_get_u32(tb[RTA_TABLE]));
ret["table"] = [&]() -> std::string {
int table = mnl_attr_get_u32(tb[RTA_TABLE]);
switch (table) {
case RT_TABLE_UNSPEC: return "unspec";
case RT_TABLE_COMPAT: return "compat";
case RT_TABLE_DEFAULT: return "default";
case RT_TABLE_MAIN: return "main";
case RT_TABLE_LOCAL: return "local";
default: return std::string("user:") + std::to_string(table);
}
}();
}
if (tb[RTA_DST]) {
struct in6_addr *addr = reinterpret_cast<struct in6_addr *>(mnl_attr_get_payload(tb[RTA_DST]));
inet_ntop(AF_INET6, addr, buf, INET6_ADDRSTRLEN);
ret["dst"] = std::string(buf);
}
if (tb[RTA_SRC]) {
struct in6_addr *addr = reinterpret_cast<struct in6_addr *>(mnl_attr_get_payload(tb[RTA_SRC]));
inet_ntop(AF_INET6, addr, buf, INET6_ADDRSTRLEN);
ret["src"] = std::string(buf);
}
if (tb[RTA_OIF]) {
char buf[IF_NAMESIZE + 1];
ret["oif"] = std::string(if_indextoname(mnl_attr_get_u32(tb[RTA_OIF]), &buf[0]));
}
if (tb[RTA_FLOW]) {
ret["flow"] = mnl_attr_get_u32(tb[RTA_FLOW]);
}
if (tb[RTA_PREFSRC]) {
struct in6_addr *addr = reinterpret_cast<struct in6_addr *>(mnl_attr_get_payload(tb[RTA_PREFSRC]));
inet_ntop(AF_INET6, addr, buf, INET6_ADDRSTRLEN);
ret["prefsrc"] = std::string(buf);
}
if (tb[RTA_GATEWAY]) {
struct in6_addr *addr = reinterpret_cast<struct in6_addr *>(mnl_attr_get_payload(tb[RTA_GATEWAY]));
inet_ntop(AF_INET6, addr, buf, INET6_ADDRSTRLEN);