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bpf: xdp: Add XDP example for head adjustment

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The XDP prog checks if the incoming packet matches any VIP:PORT
combination in the BPF hashmap.  If it is, it will encapsulate
the packet with a IPv4/v6 header as instructed by the value of
the BPF hashmap and then XDP_TX it out.

The VIP:PORT -> IP-Encap-Info can be specified by the cmd args
of the user prog.

Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau 2016-12-07 15:53:14 -08:00 committed by David S. Miller
parent ea3349a035
commit 12d8bb64e3
8 changed files with 630 additions and 93 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
samples/bpf/Makefile
View file

@ -33,6 +33,7 @@ hostprogs-y += trace_event
hostprogs-y += sampleip
hostprogs-y += tc_l2_redirect
hostprogs-y += lwt_len_hist
hostprogs-y += xdp_tx_iptunnel
test_lru_dist-objs := test_lru_dist.o libbpf.o
sock_example-objs := sock_example.o libbpf.o
@ -67,6 +68,7 @@ trace_event-objs := bpf_load.o libbpf.o trace_event_user.o
sampleip-objs := bpf_load.o libbpf.o sampleip_user.o
tc_l2_redirect-objs := bpf_load.o libbpf.o tc_l2_redirect_user.o
lwt_len_hist-objs := bpf_load.o libbpf.o lwt_len_hist_user.o
xdp_tx_iptunnel-objs := bpf_load.o libbpf.o xdp_tx_iptunnel_user.o
# Tell kbuild to always build the programs
always := $(hostprogs-y)
@ -99,6 +101,7 @@ always += test_current_task_under_cgroup_kern.o
always += trace_event_kern.o
always += sampleip_kern.o
always += lwt_len_hist_kern.o
always += xdp_tx_iptunnel_kern.o
HOSTCFLAGS += -I$(objtree)/usr/include
HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
@ -129,6 +132,7 @@ HOSTLOADLIBES_trace_event += -lelf
HOSTLOADLIBES_sampleip += -lelf
HOSTLOADLIBES_tc_l2_redirect += -l elf
HOSTLOADLIBES_lwt_len_hist += -l elf
HOSTLOADLIBES_xdp_tx_iptunnel += -lelf
# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang

2
samples/bpf/bpf_helpers.h
View file

@ -57,6 +57,8 @@ static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
(void *) BPF_FUNC_skb_set_tunnel_opt;
static unsigned long long (*bpf_get_prandom_u32)(void) =
(void *) BPF_FUNC_get_prandom_u32;
static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
(void *) BPF_FUNC_xdp_adjust_head;
/* llvm builtin functions that eBPF C program may use to
* emit BPF_LD_ABS and BPF_LD_IND instructions

94
samples/bpf/bpf_load.c
View file

@ -12,6 +12,10 @@
#include <linux/bpf.h>
#include <linux/filter.h>
#include <linux/perf_event.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
@ -450,3 +454,93 @@ struct ksym *ksym_search(long key)
/* out of range. return _stext */
return &syms[0];
}
int set_link_xdp_fd(int ifindex, int fd)
{
struct sockaddr_nl sa;
int sock, seq = 0, len, ret = -1;
char buf[4096];
struct nlattr *nla, *nla_xdp;
struct {
struct nlmsghdr nh;
struct ifinfomsg ifinfo;
char attrbuf[64];
} req;
struct nlmsghdr *nh;
struct nlmsgerr *err;
memset(&sa, 0, sizeof(sa));
sa.nl_family = AF_NETLINK;
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (sock < 0) {
printf("open netlink socket: %s\n", strerror(errno));
return -1;
}
if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
printf("bind to netlink: %s\n", strerror(errno));
goto cleanup;
}
memset(&req, 0, sizeof(req));
req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.nh.nlmsg_type = RTM_SETLINK;
req.nh.nlmsg_pid = 0;
req.nh.nlmsg_seq = ++seq;
req.ifinfo.ifi_family = AF_UNSPEC;
req.ifinfo.ifi_index = ifindex;
nla = (struct nlattr *)(((char *)&req)
+ NLMSG_ALIGN(req.nh.nlmsg_len));
nla->nla_type = NLA_F_NESTED | 43/*IFLA_XDP*/;
nla_xdp = (struct nlattr *)((char *)nla + NLA_HDRLEN);
nla_xdp->nla_type = 1/*IFLA_XDP_FD*/;
nla_xdp->nla_len = NLA_HDRLEN + sizeof(int);
memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd));
nla->nla_len = NLA_HDRLEN + nla_xdp->nla_len;
req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len);
if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
printf("send to netlink: %s\n", strerror(errno));
goto cleanup;
}
len = recv(sock, buf, sizeof(buf), 0);
if (len < 0) {
printf("recv from netlink: %s\n", strerror(errno));
goto cleanup;
}
for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len);
nh = NLMSG_NEXT(nh, len)) {
if (nh->nlmsg_pid != getpid()) {
printf("Wrong pid %d, expected %d\n",
nh->nlmsg_pid, getpid());
goto cleanup;
}
if (nh->nlmsg_seq != seq) {
printf("Wrong seq %d, expected %d\n",
nh->nlmsg_seq, seq);
goto cleanup;
}
switch (nh->nlmsg_type) {
case NLMSG_ERROR:
err = (struct nlmsgerr *)NLMSG_DATA(nh);
if (!err->error)
continue;
printf("nlmsg error %s\n", strerror(-err->error));
goto cleanup;
case NLMSG_DONE:
break;
}
}
ret = 0;
cleanup:
close(sock);
return ret;
}

1
samples/bpf/bpf_load.h
View file

@ -31,4 +31,5 @@ struct ksym {
int load_kallsyms(void);
struct ksym *ksym_search(long key);
int set_link_xdp_fd(int ifindex, int fd);
#endif

93
samples/bpf/xdp1_user.c
View file

@ -5,111 +5,18 @@
* 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 "bpf_util.h"
#include "libbpf.h"
static int set_link_xdp_fd(int ifindex, int fd)
{
struct sockaddr_nl sa;
int sock, seq = 0, len, ret = -1;
char buf[4096];
struct nlattr *nla, *nla_xdp;
struct {
struct nlmsghdr nh;
struct ifinfomsg ifinfo;
char attrbuf[64];
} req;
struct nlmsghdr *nh;
struct nlmsgerr *err;
memset(&sa, 0, sizeof(sa));
sa.nl_family = AF_NETLINK;
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (sock < 0) {
printf("open netlink socket: %s\n", strerror(errno));
return -1;
}
if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
printf("bind to netlink: %s\n", strerror(errno));
goto cleanup;
}
memset(&req, 0, sizeof(req));
req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.nh.nlmsg_type = RTM_SETLINK;
req.nh.nlmsg_pid = 0;
req.nh.nlmsg_seq = ++seq;
req.ifinfo.ifi_family = AF_UNSPEC;
req.ifinfo.ifi_index = ifindex;
nla = (struct nlattr *)(((char *)&req)
+ NLMSG_ALIGN(req.nh.nlmsg_len));
nla->nla_type = NLA_F_NESTED | 43/*IFLA_XDP*/;
nla_xdp = (struct nlattr *)((char *)nla + NLA_HDRLEN);
nla_xdp->nla_type = 1/*IFLA_XDP_FD*/;
nla_xdp->nla_len = NLA_HDRLEN + sizeof(int);
memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd));
nla->nla_len = NLA_HDRLEN + nla_xdp->nla_len;
req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len);
if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
printf("send to netlink: %s\n", strerror(errno));
goto cleanup;
}
len = recv(sock, buf, sizeof(buf), 0);
if (len < 0) {
printf("recv from netlink: %s\n", strerror(errno));
goto cleanup;
}
for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len);
nh = NLMSG_NEXT(nh, len)) {
if (nh->nlmsg_pid != getpid()) {
printf("Wrong pid %d, expected %d\n",
nh->nlmsg_pid, getpid());
goto cleanup;
}
if (nh->nlmsg_seq != seq) {
printf("Wrong seq %d, expected %d\n",
nh->nlmsg_seq, seq);
goto cleanup;
}
switch (nh->nlmsg_type) {
case NLMSG_ERROR:
err = (struct nlmsgerr *)NLMSG_DATA(nh);
if (!err->error)
continue;
printf("nlmsg error %s\n", strerror(-err->error));
goto cleanup;
case NLMSG_DONE:
break;
}
}
ret = 0;
cleanup:
close(sock);
return ret;
}
static int ifindex;
static void int_exit(int sig)

37
samples/bpf/xdp_tx_iptunnel_common.h Normal file
View file

@ -0,0 +1,37 @@
/* Copyright (c) 2016 Facebook
*
* 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.
*/
#ifndef _SAMPLES_BPF_XDP_TX_IPTNL_COMMON_H
#define _SAMPLES_BPF_XDP_TX_IPTNL_COMMON_H
#include <linux/types.h>
#define MAX_IPTNL_ENTRIES 256U
struct vip {
union {
__u32 v6[4];
__u32 v4;
} daddr;
__u16 dport;
__u16 family;
__u8 protocol;
};
struct iptnl_info {
union {
__u32 v6[4];
__u32 v4;
} saddr;
union {
__u32 v6[4];
__u32 v4;
} daddr;
__u16 family;
__u8 dmac[6];
};
#endif

236
samples/bpf/xdp_tx_iptunnel_kern.c Normal file
View file

@ -0,0 +1,236 @@
/* Copyright (c) 2016 Facebook
*
* 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.
*
* This program shows how to use bpf_xdp_adjust_head() by
* encapsulating the incoming packet in an IPv4/v6 header
* and then XDP_TX it out.
*/
#include <uapi/linux/bpf.h>
#include <linux/in.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include "bpf_helpers.h"
#include "xdp_tx_iptunnel_common.h"
struct bpf_map_def SEC("maps") rxcnt = {
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
.key_size = sizeof(__u32),
.value_size = sizeof(__u64),
.max_entries = 256,
};
struct bpf_map_def SEC("maps") vip2tnl = {
.type = BPF_MAP_TYPE_HASH,
.key_size = sizeof(struct vip),
.value_size = sizeof(struct iptnl_info),
.max_entries = MAX_IPTNL_ENTRIES,
};
static __always_inline void count_tx(u32 protocol)
{
u64 *rxcnt_count;
rxcnt_count = bpf_map_lookup_elem(&rxcnt, &protocol);
if (rxcnt_count)
*rxcnt_count += 1;
}
static __always_inline int get_dport(void *trans_data, void *data_end,
u8 protocol)
{
struct tcphdr *th;
struct udphdr *uh;
switch (protocol) {
case IPPROTO_TCP:
th = (struct tcphdr *)trans_data;
if (th + 1 > data_end)
return -1;
return th->dest;
case IPPROTO_UDP:
uh = (struct udphdr *)trans_data;
if (uh + 1 > data_end)
return -1;
return uh->dest;
default:
return 0;
}
}
static __always_inline void set_ethhdr(struct ethhdr *new_eth,
const struct ethhdr *old_eth,
const struct iptnl_info *tnl,
__be16 h_proto)
{
memcpy(new_eth->h_source, old_eth->h_dest, sizeof(new_eth->h_source));
memcpy(new_eth->h_dest, tnl->dmac, sizeof(new_eth->h_dest));
new_eth->h_proto = h_proto;
}
static __always_inline int handle_ipv4(struct xdp_md *xdp)
{
void *data_end = (void *)(long)xdp->data_end;
void *data = (void *)(long)xdp->data;
struct iptnl_info *tnl;
struct ethhdr *new_eth;
struct ethhdr *old_eth;
struct iphdr *iph = data + sizeof(struct ethhdr);
u16 *next_iph_u16;
u16 payload_len;
struct vip vip = {};
int dport;
u32 csum = 0;
int i;
if (iph + 1 > data_end)
return XDP_DROP;
dport = get_dport(iph + 1, data_end, iph->protocol);
if (dport == -1)
return XDP_DROP;
vip.protocol = iph->protocol;
vip.family = AF_INET;
vip.daddr.v4 = iph->daddr;
vip.dport = dport;
payload_len = ntohs(iph->tot_len);
tnl = bpf_map_lookup_elem(&vip2tnl, &vip);
/* It only does v4-in-v4 */
if (!tnl || tnl->family != AF_INET)
return XDP_PASS;
/* The vip key is found. Add an IP header and send it out */
if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct iphdr)))
return XDP_DROP;
data = (void *)(long)xdp->data;
data_end = (void *)(long)xdp->data_end;
new_eth = data;
iph = data + sizeof(*new_eth);
old_eth = data + sizeof(*iph);
if (new_eth + 1 > data_end ||
old_eth + 1 > data_end ||
iph + 1 > data_end)
return XDP_DROP;
set_ethhdr(new_eth, old_eth, tnl, htons(ETH_P_IP));
iph->version = 4;
iph->ihl = sizeof(*iph) >> 2;
iph->frag_off = 0;
iph->protocol = IPPROTO_IPIP;
iph->check = 0;
iph->tos = 0;
iph->tot_len = htons(payload_len + sizeof(*iph));
iph->daddr = tnl->daddr.v4;
iph->saddr = tnl->saddr.v4;
iph->ttl = 8;
next_iph_u16 = (u16 *)iph;
#pragma clang loop unroll(full)
for (i = 0; i < sizeof(*iph) >> 1; i++)
csum += *next_iph_u16++;
iph->check = ~((csum & 0xffff) + (csum >> 16));
count_tx(vip.protocol);
return XDP_TX;
}
static __always_inline int handle_ipv6(struct xdp_md *xdp)
{
void *data_end = (void *)(long)xdp->data_end;
void *data = (void *)(long)xdp->data;
struct iptnl_info *tnl;
struct ethhdr *new_eth;
struct ethhdr *old_eth;
struct ipv6hdr *ip6h = data + sizeof(struct ethhdr);
__u16 payload_len;
struct vip vip = {};
int dport;
if (ip6h + 1 > data_end)
return XDP_DROP;
dport = get_dport(ip6h + 1, data_end, ip6h->nexthdr);
if (dport == -1)
return XDP_DROP;
vip.protocol = ip6h->nexthdr;
vip.family = AF_INET6;
memcpy(vip.daddr.v6, ip6h->daddr.s6_addr32, sizeof(vip.daddr));
vip.dport = dport;
payload_len = ip6h->payload_len;
tnl = bpf_map_lookup_elem(&vip2tnl, &vip);
/* It only does v6-in-v6 */
if (!tnl || tnl->family != AF_INET6)
return XDP_PASS;
/* The vip key is found. Add an IP header and send it out */
if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct ipv6hdr)))
return XDP_DROP;
data = (void *)(long)xdp->data;
data_end = (void *)(long)xdp->data_end;
new_eth = data;
ip6h = data + sizeof(*new_eth);
old_eth = data + sizeof(*ip6h);
if (new_eth + 1 > data_end ||
old_eth + 1 > data_end ||
ip6h + 1 > data_end)
return XDP_DROP;
set_ethhdr(new_eth, old_eth, tnl, htons(ETH_P_IPV6));
ip6h->version = 6;
ip6h->priority = 0;
memset(ip6h->flow_lbl, 0, sizeof(ip6h->flow_lbl));
ip6h->payload_len = htons(ntohs(payload_len) + sizeof(*ip6h));
ip6h->nexthdr = IPPROTO_IPV6;
ip6h->hop_limit = 8;
memcpy(ip6h->saddr.s6_addr32, tnl->saddr.v6, sizeof(tnl->saddr.v6));
memcpy(ip6h->daddr.s6_addr32, tnl->daddr.v6, sizeof(tnl->daddr.v6));
count_tx(vip.protocol);
return XDP_TX;
}
SEC("xdp_tx_iptunnel")
int _xdp_tx_iptunnel(struct xdp_md *xdp)
{
void *data_end = (void *)(long)xdp->data_end;
void *data = (void *)(long)xdp->data;
struct ethhdr *eth = data;
__u16 h_proto;
if (eth + 1 > data_end)
return XDP_DROP;
h_proto = eth->h_proto;
if (h_proto == htons(ETH_P_IP))
return handle_ipv4(xdp);
else if (h_proto == htons(ETH_P_IPV6))
return handle_ipv6(xdp);
else
return XDP_PASS;
}
char _license[] SEC("license") = "GPL";

256
samples/bpf/xdp_tx_iptunnel_user.c Normal file
View file

@ -0,0 +1,256 @@
/* Copyright (c) 2016 Facebook
*
* 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 <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <arpa/inet.h>
#include <netinet/ether.h>
#include <unistd.h>
#include <time.h>
#include "bpf_load.h"
#include "libbpf.h"
#include "bpf_util.h"
#include "xdp_tx_iptunnel_common.h"
#define STATS_INTERVAL_S 2U
static int ifindex = -1;
static void int_exit(int sig)
{
if (ifindex > -1)
set_link_xdp_fd(ifindex, -1);
exit(0);
}
/* simple per-protocol drop counter
*/
static void poll_stats(unsigned int kill_after_s)
{
const unsigned int nr_protos = 256;
unsigned int nr_cpus = bpf_num_possible_cpus();
time_t started_at = time(NULL);
__u64 values[nr_cpus], prev[nr_protos][nr_cpus];
__u32 proto;
int i;
memset(prev, 0, sizeof(prev));
while (!kill_after_s || time(NULL) - started_at <= kill_after_s) {
sleep(STATS_INTERVAL_S);
for (proto = 0; proto < nr_protos; proto++) {
__u64 sum = 0;
assert(bpf_lookup_elem(map_fd[0], &proto, values) == 0);
for (i = 0; i < nr_cpus; i++)
sum += (values[i] - prev[proto][i]);
if (sum)
printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n",
proto, sum, sum / STATS_INTERVAL_S);
memcpy(prev[proto], values, sizeof(values));
}
}
}
static void usage(const char *cmd)
{
printf("Start a XDP prog which encapsulates incoming packets\n"
"in an IPv4/v6 header and XDP_TX it out. The dst <VIP:PORT>\n"
"is used to select packets to encapsulate\n\n");
printf("Usage: %s [...]\n", cmd);
printf(" -i <ifindex> Interface Index\n");
printf(" -a <vip-service-address> IPv4 or IPv6\n");
printf(" -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n");
printf(" -s <source-ip> Used in the IPTunnel header\n");
printf(" -d <dest-ip> Used in the IPTunnel header\n");
printf(" -m <dest-MAC> Used in sending the IP Tunneled pkt\n");
printf(" -T <stop-after-X-seconds> Default: 0 (forever)\n");
printf(" -P <IP-Protocol> Default is TCP\n");
printf(" -h Display this help\n");
}
static int parse_ipstr(const char *ipstr, unsigned int *addr)
{
if (inet_pton(AF_INET6, ipstr, addr) == 1) {
return AF_INET6;
} else if (inet_pton(AF_INET, ipstr, addr) == 1) {
addr[1] = addr[2] = addr[3] = 0;
return AF_INET;
}
fprintf(stderr, "%s is an invalid IP\n", ipstr);
return AF_UNSPEC;
}
static int parse_ports(const char *port_str, int *min_port, int *max_port)
{
char *end;
long tmp_min_port;
long tmp_max_port;
tmp_min_port = strtol(optarg, &end, 10);
if (tmp_min_port < 1 || tmp_min_port > 65535) {
fprintf(stderr, "Invalid port(s):%s\n", optarg);
return 1;
}
if (*end == '-') {
end++;
tmp_max_port = strtol(end, NULL, 10);
if (tmp_max_port < 1 || tmp_max_port > 65535) {
fprintf(stderr, "Invalid port(s):%s\n", optarg);
return 1;
}
} else {
tmp_max_port = tmp_min_port;
}
if (tmp_min_port > tmp_max_port) {
fprintf(stderr, "Invalid port(s):%s\n", optarg);
return 1;
}
if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) {
fprintf(stderr, "Port range (%s) is larger than %u\n",
port_str, MAX_IPTNL_ENTRIES);
return 1;
}
*min_port = tmp_min_port;
*max_port = tmp_max_port;
return 0;
}
int main(int argc, char **argv)
{
unsigned char opt_flags[256] = {};
unsigned int kill_after_s = 0;
const char *optstr = "i:a:p:s:d:m:T:P:h";
int min_port = 0, max_port = 0;
struct iptnl_info tnl = {};
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
struct vip vip = {};
char filename[256];
int opt;
int i;
tnl.family = AF_UNSPEC;
vip.protocol = IPPROTO_TCP;
for (i = 0; i < strlen(optstr); i++)
if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z')
opt_flags[(unsigned char)optstr[i]] = 1;
while ((opt = getopt(argc, argv, optstr)) != -1) {
unsigned short family;
unsigned int *v6;
switch (opt) {
case 'i':
ifindex = atoi(optarg);
break;
case 'a':
vip.family = parse_ipstr(optarg, vip.daddr.v6);
if (vip.family == AF_UNSPEC)
return 1;
break;
case 'p':
if (parse_ports(optarg, &min_port, &max_port))
return 1;
break;
case 'P':
vip.protocol = atoi(optarg);
break;
case 's':
case 'd':
if (opt == 's')
v6 = tnl.saddr.v6;
else
v6 = tnl.daddr.v6;
family = parse_ipstr(optarg, v6);
if (family == AF_UNSPEC)
return 1;
if (tnl.family == AF_UNSPEC) {
tnl.family = family;
} else if (tnl.family != family) {
fprintf(stderr,
"The IP version of the src and dst addresses used in the IP encapsulation does not match\n");
return 1;
}
break;
case 'm':
if (!ether_aton_r(optarg,
(struct ether_addr *)tnl.dmac)) {
fprintf(stderr, "Invalid mac address:%s\n",
optarg);
return 1;
}
break;
case 'T':
kill_after_s = atoi(optarg);
break;
default:
usage(argv[0]);
return 1;
}
opt_flags[opt] = 0;
}
for (i = 0; i < strlen(optstr); i++) {
if (opt_flags[(unsigned int)optstr[i]]) {
fprintf(stderr, "Missing argument -%c\n", optstr[i]);
usage(argv[0]);
return 1;
}
}
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)");
return 1;
}
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
if (load_bpf_file(filename)) {
printf("%s", bpf_log_buf);
return 1;
}
if (!prog_fd[0]) {
printf("load_bpf_file: %s\n", strerror(errno));
return 1;
}
signal(SIGINT, int_exit);
while (min_port <= max_port) {
vip.dport = htons(min_port++);
if (bpf_update_elem(map_fd[1], &vip, &tnl, BPF_NOEXIST)) {
perror("bpf_update_elem(&vip2tnl)");
return 1;
}
}
if (set_link_xdp_fd(ifindex, prog_fd[0]) < 0) {
printf("link set xdp fd failed\n");
return 1;
}
poll_stats(kill_after_s);
set_link_xdp_fd(ifindex, -1);
return 0;
}