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Diffstat (limited to '')
| -rw-r--r-- | samples/bpf/xdp_tx_iptunnel_user.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/samples/bpf/xdp_tx_iptunnel_user.c b/samples/bpf/xdp_tx_iptunnel_user.c new file mode 100644 index 000000000..a419bee15 --- /dev/null +++ b/samples/bpf/xdp_tx_iptunnel_user.c @@ -0,0 +1,314 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2016 Facebook + */ +#include <linux/bpf.h> +#include <linux/if_link.h> +#include <assert.h> +#include <errno.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <net/if.h> +#include <sys/resource.h> +#include <arpa/inet.h> +#include <netinet/ether.h> +#include <unistd.h> +#include <time.h> +#include <bpf/libbpf.h> +#include <bpf/bpf.h> +#include "bpf_util.h" +#include "xdp_tx_iptunnel_common.h" + +#define STATS_INTERVAL_S 2U + +static int ifindex = -1; +static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST; +static int rxcnt_map_fd; +static __u32 prog_id; + +static void int_exit(int sig) +{ + __u32 curr_prog_id = 0; + + if (ifindex > -1) { + if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) { + printf("bpf_get_link_xdp_id failed\n"); + exit(1); + } + if (prog_id == curr_prog_id) + bpf_set_link_xdp_fd(ifindex, -1, xdp_flags); + else if (!curr_prog_id) + printf("couldn't find a prog id on a given iface\n"); + else + printf("program on interface changed, not removing\n"); + } + 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_map_lookup_elem(rxcnt_map_fd, &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 <ifname|ifindex> Interface\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(" -S use skb-mode\n"); + printf(" -N enforce native mode\n"); + printf(" -F Force loading the XDP prog\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) +{ + struct bpf_prog_load_attr prog_load_attr = { + .prog_type = BPF_PROG_TYPE_XDP, + }; + struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; + int min_port = 0, max_port = 0, vip2tnl_map_fd; + const char *optstr = "i:a:p:s:d:m:T:P:FSNh"; + unsigned char opt_flags[256] = {}; + struct bpf_prog_info info = {}; + __u32 info_len = sizeof(info); + unsigned int kill_after_s = 0; + struct iptnl_info tnl = {}; + struct bpf_object *obj; + struct vip vip = {}; + char filename[256]; + int opt, prog_fd; + int i, err; + + 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 = if_nametoindex(optarg); + if (!ifindex) + 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; + case 'S': + xdp_flags |= XDP_FLAGS_SKB_MODE; + break; + case 'N': + /* default, set below */ + break; + case 'F': + xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST; + break; + default: + usage(argv[0]); + return 1; + } + opt_flags[opt] = 0; + } + + if (!(xdp_flags & XDP_FLAGS_SKB_MODE)) + xdp_flags |= XDP_FLAGS_DRV_MODE; + + 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; + } + + if (!ifindex) { + fprintf(stderr, "Invalid ifname\n"); + return 1; + } + + snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); + prog_load_attr.file = filename; + + if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd)) + return 1; + + if (!prog_fd) { + printf("bpf_prog_load_xattr: %s\n", strerror(errno)); + return 1; + } + + rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt"); + vip2tnl_map_fd = bpf_object__find_map_fd_by_name(obj, "vip2tnl"); + if (vip2tnl_map_fd < 0 || rxcnt_map_fd < 0) { + printf("bpf_object__find_map_fd_by_name failed\n"); + return 1; + } + + signal(SIGINT, int_exit); + signal(SIGTERM, int_exit); + + while (min_port <= max_port) { + vip.dport = htons(min_port++); + if (bpf_map_update_elem(vip2tnl_map_fd, &vip, &tnl, + BPF_NOEXIST)) { + perror("bpf_map_update_elem(&vip2tnl)"); + return 1; + } + } + + if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) { + printf("link set xdp fd failed\n"); + return 1; + } + + err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len); + if (err) { + printf("can't get prog info - %s\n", strerror(errno)); + return err; + } + prog_id = info.id; + + poll_stats(kill_after_s); + + bpf_set_link_xdp_fd(ifindex, -1, xdp_flags); + + return 0; +} |