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-rw-r--r--samples/bpf/Makefile4
-rw-r--r--samples/bpf/bpf_helpers.h2
-rw-r--r--samples/bpf/bpf_load.c94
-rw-r--r--samples/bpf/bpf_load.h1
-rw-r--r--samples/bpf/xdp1_user.c93
-rw-r--r--samples/bpf/xdp_tx_iptunnel_common.h37
-rw-r--r--samples/bpf/xdp_tx_iptunnel_kern.c236
-rw-r--r--samples/bpf/xdp_tx_iptunnel_user.c256
8 files changed, 630 insertions, 93 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 00cd3081c038..f2219c1489e5 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -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
diff --git a/samples/bpf/bpf_helpers.h b/samples/bpf/bpf_helpers.h
index 8370a6e3839d..faaffe2e139a 100644
--- a/samples/bpf/bpf_helpers.h
+++ b/samples/bpf/bpf_helpers.h
@@ -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
diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
index 49b45ccbe153..e30b6de94f2e 100644
--- a/samples/bpf/bpf_load.c
+++ b/samples/bpf/bpf_load.c
@@ -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;
+}
diff --git a/samples/bpf/bpf_load.h b/samples/bpf/bpf_load.h
index 4adeeef53ad6..fb46a421ab41 100644
--- a/samples/bpf/bpf_load.h
+++ b/samples/bpf/bpf_load.h
@@ -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
diff --git a/samples/bpf/xdp1_user.c b/samples/bpf/xdp1_user.c
index 2b2150d6d6f7..5f040a0d7712 100644
--- a/samples/bpf/xdp1_user.c
+++ b/samples/bpf/xdp1_user.c
@@ -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)
diff --git a/samples/bpf/xdp_tx_iptunnel_common.h b/samples/bpf/xdp_tx_iptunnel_common.h
new file mode 100644
index 000000000000..dd12cc35110f
--- /dev/null
+++ b/samples/bpf/xdp_tx_iptunnel_common.h
@@ -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
diff --git a/samples/bpf/xdp_tx_iptunnel_kern.c b/samples/bpf/xdp_tx_iptunnel_kern.c
new file mode 100644
index 000000000000..85c38ecd3a2d
--- /dev/null
+++ b/samples/bpf/xdp_tx_iptunnel_kern.c
@@ -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";
diff --git a/samples/bpf/xdp_tx_iptunnel_user.c b/samples/bpf/xdp_tx_iptunnel_user.c
new file mode 100644
index 000000000000..7a71f5c74684
--- /dev/null
+++ b/samples/bpf/xdp_tx_iptunnel_user.c
@@ -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;
+}