661 lines
16 KiB
C
661 lines
16 KiB
C
/* Copyright (C) 2017 Cavium, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of version 2 of the GNU General Public License
|
|
* as published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/bpf.h>
|
|
#include <linux/netlink.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/socket.h>
|
|
#include <unistd.h>
|
|
#include "bpf_load.h"
|
|
#include "libbpf.h"
|
|
#include <arpa/inet.h>
|
|
#include <fcntl.h>
|
|
#include <poll.h>
|
|
#include <net/if.h>
|
|
#include <netdb.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/syscall.h>
|
|
#include "bpf_util.h"
|
|
|
|
int sock, sock_arp, flags = 0;
|
|
static int total_ifindex;
|
|
int *ifindex_list;
|
|
char buf[8192];
|
|
|
|
static int get_route_table(int rtm_family);
|
|
static void int_exit(int sig)
|
|
{
|
|
int i = 0;
|
|
|
|
for (i = 0; i < total_ifindex; i++)
|
|
bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
|
|
exit(0);
|
|
}
|
|
|
|
static void close_and_exit(int sig)
|
|
{
|
|
int i = 0;
|
|
|
|
close(sock);
|
|
close(sock_arp);
|
|
|
|
for (i = 0; i < total_ifindex; i++)
|
|
bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
|
|
exit(0);
|
|
}
|
|
|
|
/* Get the mac address of the interface given interface name */
|
|
static __be64 getmac(char *iface)
|
|
{
|
|
struct ifreq ifr;
|
|
__be64 mac = 0;
|
|
int fd, i;
|
|
|
|
fd = socket(AF_INET, SOCK_DGRAM, 0);
|
|
ifr.ifr_addr.sa_family = AF_INET;
|
|
strncpy(ifr.ifr_name, iface, IFNAMSIZ - 1);
|
|
if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
|
|
printf("ioctl failed leaving....\n");
|
|
return -1;
|
|
}
|
|
for (i = 0; i < 6 ; i++)
|
|
*((__u8 *)&mac + i) = (__u8)ifr.ifr_hwaddr.sa_data[i];
|
|
close(fd);
|
|
return mac;
|
|
}
|
|
|
|
static int recv_msg(struct sockaddr_nl sock_addr, int sock)
|
|
{
|
|
struct nlmsghdr *nh;
|
|
int len, nll = 0;
|
|
char *buf_ptr;
|
|
|
|
buf_ptr = buf;
|
|
while (1) {
|
|
len = recv(sock, buf_ptr, sizeof(buf) - nll, 0);
|
|
if (len < 0)
|
|
return len;
|
|
|
|
nh = (struct nlmsghdr *)buf_ptr;
|
|
|
|
if (nh->nlmsg_type == NLMSG_DONE)
|
|
break;
|
|
buf_ptr += len;
|
|
nll += len;
|
|
if ((sock_addr.nl_groups & RTMGRP_NEIGH) == RTMGRP_NEIGH)
|
|
break;
|
|
|
|
if ((sock_addr.nl_groups & RTMGRP_IPV4_ROUTE) == RTMGRP_IPV4_ROUTE)
|
|
break;
|
|
}
|
|
return nll;
|
|
}
|
|
|
|
/* Function to parse the route entry returned by netlink
|
|
* Updates the route entry related map entries
|
|
*/
|
|
static void read_route(struct nlmsghdr *nh, int nll)
|
|
{
|
|
char dsts[24], gws[24], ifs[16], dsts_len[24], metrics[24];
|
|
struct bpf_lpm_trie_key *prefix_key;
|
|
struct rtattr *rt_attr;
|
|
struct rtmsg *rt_msg;
|
|
int rtm_family;
|
|
int rtl;
|
|
int i;
|
|
struct route_table {
|
|
int dst_len, iface, metric;
|
|
char *iface_name;
|
|
__be32 dst, gw;
|
|
__be64 mac;
|
|
} route;
|
|
struct arp_table {
|
|
__be64 mac;
|
|
__be32 dst;
|
|
};
|
|
|
|
struct direct_map {
|
|
struct arp_table arp;
|
|
int ifindex;
|
|
__be64 mac;
|
|
} direct_entry;
|
|
|
|
if (nh->nlmsg_type == RTM_DELROUTE)
|
|
printf("DELETING Route entry\n");
|
|
else if (nh->nlmsg_type == RTM_GETROUTE)
|
|
printf("READING Route entry\n");
|
|
else if (nh->nlmsg_type == RTM_NEWROUTE)
|
|
printf("NEW Route entry\n");
|
|
else
|
|
printf("%d\n", nh->nlmsg_type);
|
|
|
|
memset(&route, 0, sizeof(route));
|
|
printf("Destination\t\tGateway\t\tGenmask\t\tMetric\t\tIface\n");
|
|
for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
|
|
rt_msg = (struct rtmsg *)NLMSG_DATA(nh);
|
|
rtm_family = rt_msg->rtm_family;
|
|
if (rtm_family == AF_INET)
|
|
if (rt_msg->rtm_table != RT_TABLE_MAIN)
|
|
continue;
|
|
rt_attr = (struct rtattr *)RTM_RTA(rt_msg);
|
|
rtl = RTM_PAYLOAD(nh);
|
|
|
|
for (; RTA_OK(rt_attr, rtl); rt_attr = RTA_NEXT(rt_attr, rtl)) {
|
|
switch (rt_attr->rta_type) {
|
|
case NDA_DST:
|
|
sprintf(dsts, "%u",
|
|
(*((__be32 *)RTA_DATA(rt_attr))));
|
|
break;
|
|
case RTA_GATEWAY:
|
|
sprintf(gws, "%u",
|
|
*((__be32 *)RTA_DATA(rt_attr)));
|
|
break;
|
|
case RTA_OIF:
|
|
sprintf(ifs, "%u",
|
|
*((int *)RTA_DATA(rt_attr)));
|
|
break;
|
|
case RTA_METRICS:
|
|
sprintf(metrics, "%u",
|
|
*((int *)RTA_DATA(rt_attr)));
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
sprintf(dsts_len, "%d", rt_msg->rtm_dst_len);
|
|
route.dst = atoi(dsts);
|
|
route.dst_len = atoi(dsts_len);
|
|
route.gw = atoi(gws);
|
|
route.iface = atoi(ifs);
|
|
route.metric = atoi(metrics);
|
|
route.iface_name = alloca(sizeof(char *) * IFNAMSIZ);
|
|
route.iface_name = if_indextoname(route.iface, route.iface_name);
|
|
route.mac = getmac(route.iface_name);
|
|
if (route.mac == -1) {
|
|
int i = 0;
|
|
|
|
for (i = 0; i < total_ifindex; i++)
|
|
bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
|
|
exit(0);
|
|
}
|
|
assert(bpf_map_update_elem(map_fd[4], &route.iface, &route.iface, 0) == 0);
|
|
if (rtm_family == AF_INET) {
|
|
struct trie_value {
|
|
__u8 prefix[4];
|
|
__be64 value;
|
|
int ifindex;
|
|
int metric;
|
|
__be32 gw;
|
|
} *prefix_value;
|
|
|
|
prefix_key = alloca(sizeof(*prefix_key) + 3);
|
|
prefix_value = alloca(sizeof(*prefix_value));
|
|
|
|
prefix_key->prefixlen = 32;
|
|
prefix_key->prefixlen = route.dst_len;
|
|
direct_entry.mac = route.mac & 0xffffffffffff;
|
|
direct_entry.ifindex = route.iface;
|
|
direct_entry.arp.mac = 0;
|
|
direct_entry.arp.dst = 0;
|
|
if (route.dst_len == 32) {
|
|
if (nh->nlmsg_type == RTM_DELROUTE) {
|
|
assert(bpf_map_delete_elem(map_fd[3], &route.dst) == 0);
|
|
} else {
|
|
if (bpf_map_lookup_elem(map_fd[2], &route.dst, &direct_entry.arp.mac) == 0)
|
|
direct_entry.arp.dst = route.dst;
|
|
assert(bpf_map_update_elem(map_fd[3], &route.dst, &direct_entry, 0) == 0);
|
|
}
|
|
}
|
|
for (i = 0; i < 4; i++)
|
|
prefix_key->data[i] = (route.dst >> i * 8) & 0xff;
|
|
|
|
printf("%3d.%d.%d.%d\t\t%3x\t\t%d\t\t%d\t\t%s\n",
|
|
(int)prefix_key->data[0],
|
|
(int)prefix_key->data[1],
|
|
(int)prefix_key->data[2],
|
|
(int)prefix_key->data[3],
|
|
route.gw, route.dst_len,
|
|
route.metric,
|
|
route.iface_name);
|
|
if (bpf_map_lookup_elem(map_fd[0], prefix_key,
|
|
prefix_value) < 0) {
|
|
for (i = 0; i < 4; i++)
|
|
prefix_value->prefix[i] = prefix_key->data[i];
|
|
prefix_value->value = route.mac & 0xffffffffffff;
|
|
prefix_value->ifindex = route.iface;
|
|
prefix_value->gw = route.gw;
|
|
prefix_value->metric = route.metric;
|
|
|
|
assert(bpf_map_update_elem(map_fd[0],
|
|
prefix_key,
|
|
prefix_value, 0
|
|
) == 0);
|
|
} else {
|
|
if (nh->nlmsg_type == RTM_DELROUTE) {
|
|
printf("deleting entry\n");
|
|
printf("prefix key=%d.%d.%d.%d/%d",
|
|
prefix_key->data[0],
|
|
prefix_key->data[1],
|
|
prefix_key->data[2],
|
|
prefix_key->data[3],
|
|
prefix_key->prefixlen);
|
|
assert(bpf_map_delete_elem(map_fd[0],
|
|
prefix_key
|
|
) == 0);
|
|
/* Rereading the route table to check if
|
|
* there is an entry with the same
|
|
* prefix but a different metric as the
|
|
* deleted enty.
|
|
*/
|
|
get_route_table(AF_INET);
|
|
} else if (prefix_key->data[0] ==
|
|
prefix_value->prefix[0] &&
|
|
prefix_key->data[1] ==
|
|
prefix_value->prefix[1] &&
|
|
prefix_key->data[2] ==
|
|
prefix_value->prefix[2] &&
|
|
prefix_key->data[3] ==
|
|
prefix_value->prefix[3] &&
|
|
route.metric >= prefix_value->metric) {
|
|
continue;
|
|
} else {
|
|
for (i = 0; i < 4; i++)
|
|
prefix_value->prefix[i] =
|
|
prefix_key->data[i];
|
|
prefix_value->value =
|
|
route.mac & 0xffffffffffff;
|
|
prefix_value->ifindex = route.iface;
|
|
prefix_value->gw = route.gw;
|
|
prefix_value->metric = route.metric;
|
|
assert(bpf_map_update_elem(
|
|
map_fd[0],
|
|
prefix_key,
|
|
prefix_value,
|
|
0) == 0);
|
|
}
|
|
}
|
|
}
|
|
memset(&route, 0, sizeof(route));
|
|
memset(dsts, 0, sizeof(dsts));
|
|
memset(dsts_len, 0, sizeof(dsts_len));
|
|
memset(gws, 0, sizeof(gws));
|
|
memset(ifs, 0, sizeof(ifs));
|
|
memset(&route, 0, sizeof(route));
|
|
}
|
|
}
|
|
|
|
/* Function to read the existing route table when the process is launched*/
|
|
static int get_route_table(int rtm_family)
|
|
{
|
|
struct sockaddr_nl sa;
|
|
struct nlmsghdr *nh;
|
|
int sock, seq = 0;
|
|
struct msghdr msg;
|
|
struct iovec iov;
|
|
int ret = 0;
|
|
int nll;
|
|
|
|
struct {
|
|
struct nlmsghdr nl;
|
|
struct rtmsg rt;
|
|
char buf[8192];
|
|
} req;
|
|
|
|
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
|
if (sock < 0) {
|
|
printf("open netlink socket: %s\n", strerror(errno));
|
|
return -1;
|
|
}
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.nl_family = AF_NETLINK;
|
|
if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
|
|
printf("bind to netlink: %s\n", strerror(errno));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
memset(&req, 0, sizeof(req));
|
|
req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
|
|
req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
|
|
req.nl.nlmsg_type = RTM_GETROUTE;
|
|
|
|
req.rt.rtm_family = rtm_family;
|
|
req.rt.rtm_table = RT_TABLE_MAIN;
|
|
req.nl.nlmsg_pid = 0;
|
|
req.nl.nlmsg_seq = ++seq;
|
|
memset(&msg, 0, sizeof(msg));
|
|
iov.iov_base = (void *)&req.nl;
|
|
iov.iov_len = req.nl.nlmsg_len;
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
ret = sendmsg(sock, &msg, 0);
|
|
if (ret < 0) {
|
|
printf("send to netlink: %s\n", strerror(errno));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
memset(buf, 0, sizeof(buf));
|
|
nll = recv_msg(sa, sock);
|
|
if (nll < 0) {
|
|
printf("recv from netlink: %s\n", strerror(nll));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
nh = (struct nlmsghdr *)buf;
|
|
read_route(nh, nll);
|
|
cleanup:
|
|
close(sock);
|
|
return ret;
|
|
}
|
|
|
|
/* Function to parse the arp entry returned by netlink
|
|
* Updates the arp entry related map entries
|
|
*/
|
|
static void read_arp(struct nlmsghdr *nh, int nll)
|
|
{
|
|
struct rtattr *rt_attr;
|
|
char dsts[24], mac[24];
|
|
struct ndmsg *rt_msg;
|
|
int rtl, ndm_family;
|
|
|
|
struct arp_table {
|
|
__be64 mac;
|
|
__be32 dst;
|
|
} arp_entry;
|
|
struct direct_map {
|
|
struct arp_table arp;
|
|
int ifindex;
|
|
__be64 mac;
|
|
} direct_entry;
|
|
|
|
if (nh->nlmsg_type == RTM_GETNEIGH)
|
|
printf("READING arp entry\n");
|
|
printf("Address\tHwAddress\n");
|
|
for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
|
|
rt_msg = (struct ndmsg *)NLMSG_DATA(nh);
|
|
rt_attr = (struct rtattr *)RTM_RTA(rt_msg);
|
|
ndm_family = rt_msg->ndm_family;
|
|
rtl = RTM_PAYLOAD(nh);
|
|
for (; RTA_OK(rt_attr, rtl); rt_attr = RTA_NEXT(rt_attr, rtl)) {
|
|
switch (rt_attr->rta_type) {
|
|
case NDA_DST:
|
|
sprintf(dsts, "%u",
|
|
*((__be32 *)RTA_DATA(rt_attr)));
|
|
break;
|
|
case NDA_LLADDR:
|
|
sprintf(mac, "%lld",
|
|
*((__be64 *)RTA_DATA(rt_attr)));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
arp_entry.dst = atoi(dsts);
|
|
arp_entry.mac = atol(mac);
|
|
printf("%x\t\t%llx\n", arp_entry.dst, arp_entry.mac);
|
|
if (ndm_family == AF_INET) {
|
|
if (bpf_map_lookup_elem(map_fd[3], &arp_entry.dst,
|
|
&direct_entry) == 0) {
|
|
if (nh->nlmsg_type == RTM_DELNEIGH) {
|
|
direct_entry.arp.dst = 0;
|
|
direct_entry.arp.mac = 0;
|
|
} else if (nh->nlmsg_type == RTM_NEWNEIGH) {
|
|
direct_entry.arp.dst = arp_entry.dst;
|
|
direct_entry.arp.mac = arp_entry.mac;
|
|
}
|
|
assert(bpf_map_update_elem(map_fd[3],
|
|
&arp_entry.dst,
|
|
&direct_entry, 0
|
|
) == 0);
|
|
memset(&direct_entry, 0, sizeof(direct_entry));
|
|
}
|
|
if (nh->nlmsg_type == RTM_DELNEIGH) {
|
|
assert(bpf_map_delete_elem(map_fd[2], &arp_entry.dst) == 0);
|
|
} else if (nh->nlmsg_type == RTM_NEWNEIGH) {
|
|
assert(bpf_map_update_elem(map_fd[2],
|
|
&arp_entry.dst,
|
|
&arp_entry.mac, 0
|
|
) == 0);
|
|
}
|
|
}
|
|
memset(&arp_entry, 0, sizeof(arp_entry));
|
|
memset(dsts, 0, sizeof(dsts));
|
|
}
|
|
}
|
|
|
|
/* Function to read the existing arp table when the process is launched*/
|
|
static int get_arp_table(int rtm_family)
|
|
{
|
|
struct sockaddr_nl sa;
|
|
struct nlmsghdr *nh;
|
|
int sock, seq = 0;
|
|
struct msghdr msg;
|
|
struct iovec iov;
|
|
int ret = 0;
|
|
int nll;
|
|
struct {
|
|
struct nlmsghdr nl;
|
|
struct ndmsg rt;
|
|
char buf[8192];
|
|
} req;
|
|
|
|
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
|
if (sock < 0) {
|
|
printf("open netlink socket: %s\n", strerror(errno));
|
|
return -1;
|
|
}
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.nl_family = AF_NETLINK;
|
|
if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
|
|
printf("bind to netlink: %s\n", strerror(errno));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
memset(&req, 0, sizeof(req));
|
|
req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
|
|
req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
|
|
req.nl.nlmsg_type = RTM_GETNEIGH;
|
|
req.rt.ndm_state = NUD_REACHABLE;
|
|
req.rt.ndm_family = rtm_family;
|
|
req.nl.nlmsg_pid = 0;
|
|
req.nl.nlmsg_seq = ++seq;
|
|
memset(&msg, 0, sizeof(msg));
|
|
iov.iov_base = (void *)&req.nl;
|
|
iov.iov_len = req.nl.nlmsg_len;
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
ret = sendmsg(sock, &msg, 0);
|
|
if (ret < 0) {
|
|
printf("send to netlink: %s\n", strerror(errno));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
memset(buf, 0, sizeof(buf));
|
|
nll = recv_msg(sa, sock);
|
|
if (nll < 0) {
|
|
printf("recv from netlink: %s\n", strerror(nll));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
nh = (struct nlmsghdr *)buf;
|
|
read_arp(nh, nll);
|
|
cleanup:
|
|
close(sock);
|
|
return ret;
|
|
}
|
|
|
|
/* Function to keep track and update changes in route and arp table
|
|
* Give regular statistics of packets forwarded
|
|
*/
|
|
static int monitor_route(void)
|
|
{
|
|
unsigned int nr_cpus = bpf_num_possible_cpus();
|
|
const unsigned int nr_keys = 256;
|
|
struct pollfd fds_route, fds_arp;
|
|
__u64 prev[nr_keys][nr_cpus];
|
|
struct sockaddr_nl la, lr;
|
|
__u64 values[nr_cpus];
|
|
struct nlmsghdr *nh;
|
|
int nll, ret = 0;
|
|
int interval = 5;
|
|
__u32 key;
|
|
int i;
|
|
|
|
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
|
if (sock < 0) {
|
|
printf("open netlink socket: %s\n", strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
fcntl(sock, F_SETFL, O_NONBLOCK);
|
|
memset(&lr, 0, sizeof(lr));
|
|
lr.nl_family = AF_NETLINK;
|
|
lr.nl_groups = RTMGRP_IPV6_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_NOTIFY;
|
|
if (bind(sock, (struct sockaddr *)&lr, sizeof(lr)) < 0) {
|
|
printf("bind to netlink: %s\n", strerror(errno));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
fds_route.fd = sock;
|
|
fds_route.events = POLL_IN;
|
|
|
|
sock_arp = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
|
if (sock_arp < 0) {
|
|
printf("open netlink socket: %s\n", strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
fcntl(sock_arp, F_SETFL, O_NONBLOCK);
|
|
memset(&la, 0, sizeof(la));
|
|
la.nl_family = AF_NETLINK;
|
|
la.nl_groups = RTMGRP_NEIGH | RTMGRP_NOTIFY;
|
|
if (bind(sock_arp, (struct sockaddr *)&la, sizeof(la)) < 0) {
|
|
printf("bind to netlink: %s\n", strerror(errno));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
fds_arp.fd = sock_arp;
|
|
fds_arp.events = POLL_IN;
|
|
|
|
memset(prev, 0, sizeof(prev));
|
|
do {
|
|
signal(SIGINT, close_and_exit);
|
|
signal(SIGTERM, close_and_exit);
|
|
|
|
sleep(interval);
|
|
for (key = 0; key < nr_keys; key++) {
|
|
__u64 sum = 0;
|
|
|
|
assert(bpf_map_lookup_elem(map_fd[1], &key, values) == 0);
|
|
for (i = 0; i < nr_cpus; i++)
|
|
sum += (values[i] - prev[key][i]);
|
|
if (sum)
|
|
printf("proto %u: %10llu pkt/s\n",
|
|
key, sum / interval);
|
|
memcpy(prev[key], values, sizeof(values));
|
|
}
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
if (poll(&fds_route, 1, 3) == POLL_IN) {
|
|
nll = recv_msg(lr, sock);
|
|
if (nll < 0) {
|
|
printf("recv from netlink: %s\n", strerror(nll));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
|
|
nh = (struct nlmsghdr *)buf;
|
|
printf("Routing table updated.\n");
|
|
read_route(nh, nll);
|
|
}
|
|
memset(buf, 0, sizeof(buf));
|
|
if (poll(&fds_arp, 1, 3) == POLL_IN) {
|
|
nll = recv_msg(la, sock_arp);
|
|
if (nll < 0) {
|
|
printf("recv from netlink: %s\n", strerror(nll));
|
|
ret = -1;
|
|
goto cleanup;
|
|
}
|
|
|
|
nh = (struct nlmsghdr *)buf;
|
|
read_arp(nh, nll);
|
|
}
|
|
|
|
} while (1);
|
|
cleanup:
|
|
close(sock);
|
|
return ret;
|
|
}
|
|
|
|
int main(int ac, char **argv)
|
|
{
|
|
char filename[256];
|
|
char **ifname_list;
|
|
int i = 1;
|
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
if (ac < 2) {
|
|
printf("usage: %s [-S] Interface name list\n", argv[0]);
|
|
return 1;
|
|
}
|
|
if (!strcmp(argv[1], "-S")) {
|
|
flags = XDP_FLAGS_SKB_MODE;
|
|
total_ifindex = ac - 2;
|
|
ifname_list = (argv + 2);
|
|
} else {
|
|
flags = 0;
|
|
total_ifindex = ac - 1;
|
|
ifname_list = (argv + 1);
|
|
}
|
|
if (load_bpf_file(filename)) {
|
|
printf("%s", bpf_log_buf);
|
|
return 1;
|
|
}
|
|
printf("\n**************loading bpf file*********************\n\n\n");
|
|
if (!prog_fd[0]) {
|
|
printf("load_bpf_file: %s\n", strerror(errno));
|
|
return 1;
|
|
}
|
|
ifindex_list = (int *)malloc(total_ifindex * sizeof(int *));
|
|
for (i = 0; i < total_ifindex; i++) {
|
|
ifindex_list[i] = if_nametoindex(ifname_list[i]);
|
|
if (!ifindex_list[i]) {
|
|
printf("Couldn't translate interface name: %s",
|
|
strerror(errno));
|
|
return 1;
|
|
}
|
|
}
|
|
for (i = 0; i < total_ifindex; i++) {
|
|
if (bpf_set_link_xdp_fd(ifindex_list[i], prog_fd[0], flags) < 0) {
|
|
printf("link set xdp fd failed\n");
|
|
int recovery_index = i;
|
|
|
|
for (i = 0; i < recovery_index; i++)
|
|
bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
|
|
|
|
return 1;
|
|
}
|
|
printf("Attached to %d\n", ifindex_list[i]);
|
|
}
|
|
signal(SIGINT, int_exit);
|
|
signal(SIGTERM, int_exit);
|
|
|
|
printf("*******************ROUTE TABLE*************************\n\n\n");
|
|
get_route_table(AF_INET);
|
|
printf("*******************ARP TABLE***************************\n\n\n");
|
|
get_arp_table(AF_INET);
|
|
if (monitor_route() < 0) {
|
|
printf("Error in receiving route update");
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|