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Linux/samples/bpf/xdp_tx_iptunnel_user.c

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  1 /* Copyright (c) 2016 Facebook
  2  *
  3  * This program is free software; you can redistribute it and/or
  4  * modify it under the terms of version 2 of the GNU General Public
  5  * License as published by the Free Software Foundation.
  6  */
  7 #include <linux/bpf.h>
  8 #include <linux/if_link.h>
  9 #include <assert.h>
 10 #include <errno.h>
 11 #include <signal.h>
 12 #include <stdio.h>
 13 #include <stdlib.h>
 14 #include <string.h>
 15 #include <sys/resource.h>
 16 #include <arpa/inet.h>
 17 #include <netinet/ether.h>
 18 #include <unistd.h>
 19 #include <time.h>
 20 #include "bpf_load.h"
 21 #include <bpf/bpf.h>
 22 #include "bpf_util.h"
 23 #include "xdp_tx_iptunnel_common.h"
 24 
 25 #define STATS_INTERVAL_S 2U
 26 
 27 static int ifindex = -1;
 28 static __u32 xdp_flags = 0;
 29 
 30 static void int_exit(int sig)
 31 {
 32         if (ifindex > -1)
 33                 bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
 34         exit(0);
 35 }
 36 
 37 /* simple per-protocol drop counter
 38  */
 39 static void poll_stats(unsigned int kill_after_s)
 40 {
 41         const unsigned int nr_protos = 256;
 42         unsigned int nr_cpus = bpf_num_possible_cpus();
 43         time_t started_at = time(NULL);
 44         __u64 values[nr_cpus], prev[nr_protos][nr_cpus];
 45         __u32 proto;
 46         int i;
 47 
 48         memset(prev, 0, sizeof(prev));
 49 
 50         while (!kill_after_s || time(NULL) - started_at <= kill_after_s) {
 51                 sleep(STATS_INTERVAL_S);
 52 
 53                 for (proto = 0; proto < nr_protos; proto++) {
 54                         __u64 sum = 0;
 55 
 56                         assert(bpf_map_lookup_elem(map_fd[0], &proto, values) == 0);
 57                         for (i = 0; i < nr_cpus; i++)
 58                                 sum += (values[i] - prev[proto][i]);
 59 
 60                         if (sum)
 61                                 printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n",
 62                                        proto, sum, sum / STATS_INTERVAL_S);
 63                         memcpy(prev[proto], values, sizeof(values));
 64                 }
 65         }
 66 }
 67 
 68 static void usage(const char *cmd)
 69 {
 70         printf("Start a XDP prog which encapsulates incoming packets\n"
 71                "in an IPv4/v6 header and XDP_TX it out.  The dst <VIP:PORT>\n"
 72                "is used to select packets to encapsulate\n\n");
 73         printf("Usage: %s [...]\n", cmd);
 74         printf("    -i <ifindex> Interface Index\n");
 75         printf("    -a <vip-service-address> IPv4 or IPv6\n");
 76         printf("    -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n");
 77         printf("    -s <source-ip> Used in the IPTunnel header\n");
 78         printf("    -d <dest-ip> Used in the IPTunnel header\n");
 79         printf("    -m <dest-MAC> Used in sending the IP Tunneled pkt\n");
 80         printf("    -T <stop-after-X-seconds> Default: 0 (forever)\n");
 81         printf("    -P <IP-Protocol> Default is TCP\n");
 82         printf("    -S use skb-mode\n");
 83         printf("    -N enforce native mode\n");
 84         printf("    -h Display this help\n");
 85 }
 86 
 87 static int parse_ipstr(const char *ipstr, unsigned int *addr)
 88 {
 89         if (inet_pton(AF_INET6, ipstr, addr) == 1) {
 90                 return AF_INET6;
 91         } else if (inet_pton(AF_INET, ipstr, addr) == 1) {
 92                 addr[1] = addr[2] = addr[3] = 0;
 93                 return AF_INET;
 94         }
 95 
 96         fprintf(stderr, "%s is an invalid IP\n", ipstr);
 97         return AF_UNSPEC;
 98 }
 99 
100 static int parse_ports(const char *port_str, int *min_port, int *max_port)
101 {
102         char *end;
103         long tmp_min_port;
104         long tmp_max_port;
105 
106         tmp_min_port = strtol(optarg, &end, 10);
107         if (tmp_min_port < 1 || tmp_min_port > 65535) {
108                 fprintf(stderr, "Invalid port(s):%s\n", optarg);
109                 return 1;
110         }
111 
112         if (*end == '-') {
113                 end++;
114                 tmp_max_port = strtol(end, NULL, 10);
115                 if (tmp_max_port < 1 || tmp_max_port > 65535) {
116                         fprintf(stderr, "Invalid port(s):%s\n", optarg);
117                         return 1;
118                 }
119         } else {
120                 tmp_max_port = tmp_min_port;
121         }
122 
123         if (tmp_min_port > tmp_max_port) {
124                 fprintf(stderr, "Invalid port(s):%s\n", optarg);
125                 return 1;
126         }
127 
128         if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) {
129                 fprintf(stderr, "Port range (%s) is larger than %u\n",
130                         port_str, MAX_IPTNL_ENTRIES);
131                 return 1;
132         }
133         *min_port = tmp_min_port;
134         *max_port = tmp_max_port;
135 
136         return 0;
137 }
138 
139 int main(int argc, char **argv)
140 {
141         unsigned char opt_flags[256] = {};
142         unsigned int kill_after_s = 0;
143         const char *optstr = "i:a:p:s:d:m:T:P:SNh";
144         int min_port = 0, max_port = 0;
145         struct iptnl_info tnl = {};
146         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
147         struct vip vip = {};
148         char filename[256];
149         int opt;
150         int i;
151 
152         tnl.family = AF_UNSPEC;
153         vip.protocol = IPPROTO_TCP;
154 
155         for (i = 0; i < strlen(optstr); i++)
156                 if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z')
157                         opt_flags[(unsigned char)optstr[i]] = 1;
158 
159         while ((opt = getopt(argc, argv, optstr)) != -1) {
160                 unsigned short family;
161                 unsigned int *v6;
162 
163                 switch (opt) {
164                 case 'i':
165                         ifindex = atoi(optarg);
166                         break;
167                 case 'a':
168                         vip.family = parse_ipstr(optarg, vip.daddr.v6);
169                         if (vip.family == AF_UNSPEC)
170                                 return 1;
171                         break;
172                 case 'p':
173                         if (parse_ports(optarg, &min_port, &max_port))
174                                 return 1;
175                         break;
176                 case 'P':
177                         vip.protocol = atoi(optarg);
178                         break;
179                 case 's':
180                 case 'd':
181                         if (opt == 's')
182                                 v6 = tnl.saddr.v6;
183                         else
184                                 v6 = tnl.daddr.v6;
185 
186                         family = parse_ipstr(optarg, v6);
187                         if (family == AF_UNSPEC)
188                                 return 1;
189                         if (tnl.family == AF_UNSPEC) {
190                                 tnl.family = family;
191                         } else if (tnl.family != family) {
192                                 fprintf(stderr,
193                                         "The IP version of the src and dst addresses used in the IP encapsulation does not match\n");
194                                 return 1;
195                         }
196                         break;
197                 case 'm':
198                         if (!ether_aton_r(optarg,
199                                           (struct ether_addr *)tnl.dmac)) {
200                                 fprintf(stderr, "Invalid mac address:%s\n",
201                                         optarg);
202                                 return 1;
203                         }
204                         break;
205                 case 'T':
206                         kill_after_s = atoi(optarg);
207                         break;
208                 case 'S':
209                         xdp_flags |= XDP_FLAGS_SKB_MODE;
210                         break;
211                 case 'N':
212                         xdp_flags |= XDP_FLAGS_DRV_MODE;
213                         break;
214                 default:
215                         usage(argv[0]);
216                         return 1;
217                 }
218                 opt_flags[opt] = 0;
219         }
220 
221         for (i = 0; i < strlen(optstr); i++) {
222                 if (opt_flags[(unsigned int)optstr[i]]) {
223                         fprintf(stderr, "Missing argument -%c\n", optstr[i]);
224                         usage(argv[0]);
225                         return 1;
226                 }
227         }
228 
229         if (setrlimit(RLIMIT_MEMLOCK, &r)) {
230                 perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)");
231                 return 1;
232         }
233 
234         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
235 
236         if (load_bpf_file(filename)) {
237                 printf("%s", bpf_log_buf);
238                 return 1;
239         }
240 
241         if (!prog_fd[0]) {
242                 printf("load_bpf_file: %s\n", strerror(errno));
243                 return 1;
244         }
245 
246         signal(SIGINT, int_exit);
247         signal(SIGTERM, int_exit);
248 
249         while (min_port <= max_port) {
250                 vip.dport = htons(min_port++);
251                 if (bpf_map_update_elem(map_fd[1], &vip, &tnl, BPF_NOEXIST)) {
252                         perror("bpf_map_update_elem(&vip2tnl)");
253                         return 1;
254                 }
255         }
256 
257         if (bpf_set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) {
258                 printf("link set xdp fd failed\n");
259                 return 1;
260         }
261 
262         poll_stats(kill_after_s);
263 
264         bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
265 
266         return 0;
267 }
268 

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