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Linux/samples/bpf/xdp_tx_iptunnel_user.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* Copyright (c) 2016 Facebook
  3  */
  4 #include <linux/bpf.h>
  5 #include <linux/if_link.h>
  6 #include <assert.h>
  7 #include <errno.h>
  8 #include <signal.h>
  9 #include <stdio.h>
 10 #include <stdlib.h>
 11 #include <string.h>
 12 #include <net/if.h>
 13 #include <sys/resource.h>
 14 #include <arpa/inet.h>
 15 #include <netinet/ether.h>
 16 #include <unistd.h>
 17 #include <time.h>
 18 #include <bpf/libbpf.h>
 19 #include <bpf/bpf.h>
 20 #include "bpf_util.h"
 21 #include "xdp_tx_iptunnel_common.h"
 22 
 23 #define STATS_INTERVAL_S 2U
 24 
 25 static int ifindex = -1;
 26 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 27 static int rxcnt_map_fd;
 28 static __u32 prog_id;
 29 
 30 static void int_exit(int sig)
 31 {
 32         __u32 curr_prog_id = 0;
 33 
 34         if (ifindex > -1) {
 35                 if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
 36                         printf("bpf_get_link_xdp_id failed\n");
 37                         exit(1);
 38                 }
 39                 if (prog_id == curr_prog_id)
 40                         bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
 41                 else if (!curr_prog_id)
 42                         printf("couldn't find a prog id on a given iface\n");
 43                 else
 44                         printf("program on interface changed, not removing\n");
 45         }
 46         exit(0);
 47 }
 48 
 49 /* simple per-protocol drop counter
 50  */
 51 static void poll_stats(unsigned int kill_after_s)
 52 {
 53         const unsigned int nr_protos = 256;
 54         unsigned int nr_cpus = bpf_num_possible_cpus();
 55         time_t started_at = time(NULL);
 56         __u64 values[nr_cpus], prev[nr_protos][nr_cpus];
 57         __u32 proto;
 58         int i;
 59 
 60         memset(prev, 0, sizeof(prev));
 61 
 62         while (!kill_after_s || time(NULL) - started_at <= kill_after_s) {
 63                 sleep(STATS_INTERVAL_S);
 64 
 65                 for (proto = 0; proto < nr_protos; proto++) {
 66                         __u64 sum = 0;
 67 
 68                         assert(bpf_map_lookup_elem(rxcnt_map_fd, &proto,
 69                                                    values) == 0);
 70                         for (i = 0; i < nr_cpus; i++)
 71                                 sum += (values[i] - prev[proto][i]);
 72 
 73                         if (sum)
 74                                 printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n",
 75                                        proto, sum, sum / STATS_INTERVAL_S);
 76                         memcpy(prev[proto], values, sizeof(values));
 77                 }
 78         }
 79 }
 80 
 81 static void usage(const char *cmd)
 82 {
 83         printf("Start a XDP prog which encapsulates incoming packets\n"
 84                "in an IPv4/v6 header and XDP_TX it out.  The dst <VIP:PORT>\n"
 85                "is used to select packets to encapsulate\n\n");
 86         printf("Usage: %s [...]\n", cmd);
 87         printf("    -i <ifname|ifindex> Interface\n");
 88         printf("    -a <vip-service-address> IPv4 or IPv6\n");
 89         printf("    -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n");
 90         printf("    -s <source-ip> Used in the IPTunnel header\n");
 91         printf("    -d <dest-ip> Used in the IPTunnel header\n");
 92         printf("    -m <dest-MAC> Used in sending the IP Tunneled pkt\n");
 93         printf("    -T <stop-after-X-seconds> Default: 0 (forever)\n");
 94         printf("    -P <IP-Protocol> Default is TCP\n");
 95         printf("    -S use skb-mode\n");
 96         printf("    -N enforce native mode\n");
 97         printf("    -F Force loading the XDP prog\n");
 98         printf("    -h Display this help\n");
 99 }
100 
101 static int parse_ipstr(const char *ipstr, unsigned int *addr)
102 {
103         if (inet_pton(AF_INET6, ipstr, addr) == 1) {
104                 return AF_INET6;
105         } else if (inet_pton(AF_INET, ipstr, addr) == 1) {
106                 addr[1] = addr[2] = addr[3] = 0;
107                 return AF_INET;
108         }
109 
110         fprintf(stderr, "%s is an invalid IP\n", ipstr);
111         return AF_UNSPEC;
112 }
113 
114 static int parse_ports(const char *port_str, int *min_port, int *max_port)
115 {
116         char *end;
117         long tmp_min_port;
118         long tmp_max_port;
119 
120         tmp_min_port = strtol(optarg, &end, 10);
121         if (tmp_min_port < 1 || tmp_min_port > 65535) {
122                 fprintf(stderr, "Invalid port(s):%s\n", optarg);
123                 return 1;
124         }
125 
126         if (*end == '-') {
127                 end++;
128                 tmp_max_port = strtol(end, NULL, 10);
129                 if (tmp_max_port < 1 || tmp_max_port > 65535) {
130                         fprintf(stderr, "Invalid port(s):%s\n", optarg);
131                         return 1;
132                 }
133         } else {
134                 tmp_max_port = tmp_min_port;
135         }
136 
137         if (tmp_min_port > tmp_max_port) {
138                 fprintf(stderr, "Invalid port(s):%s\n", optarg);
139                 return 1;
140         }
141 
142         if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) {
143                 fprintf(stderr, "Port range (%s) is larger than %u\n",
144                         port_str, MAX_IPTNL_ENTRIES);
145                 return 1;
146         }
147         *min_port = tmp_min_port;
148         *max_port = tmp_max_port;
149 
150         return 0;
151 }
152 
153 int main(int argc, char **argv)
154 {
155         struct bpf_prog_load_attr prog_load_attr = {
156                 .prog_type      = BPF_PROG_TYPE_XDP,
157         };
158         int min_port = 0, max_port = 0, vip2tnl_map_fd;
159         const char *optstr = "i:a:p:s:d:m:T:P:FSNh";
160         unsigned char opt_flags[256] = {};
161         struct bpf_prog_info info = {};
162         __u32 info_len = sizeof(info);
163         unsigned int kill_after_s = 0;
164         struct iptnl_info tnl = {};
165         struct bpf_object *obj;
166         struct vip vip = {};
167         char filename[256];
168         int opt, prog_fd;
169         int i, err;
170 
171         tnl.family = AF_UNSPEC;
172         vip.protocol = IPPROTO_TCP;
173 
174         for (i = 0; i < strlen(optstr); i++)
175                 if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z')
176                         opt_flags[(unsigned char)optstr[i]] = 1;
177 
178         while ((opt = getopt(argc, argv, optstr)) != -1) {
179                 unsigned short family;
180                 unsigned int *v6;
181 
182                 switch (opt) {
183                 case 'i':
184                         ifindex = if_nametoindex(optarg);
185                         if (!ifindex)
186                                 ifindex = atoi(optarg);
187                         break;
188                 case 'a':
189                         vip.family = parse_ipstr(optarg, vip.daddr.v6);
190                         if (vip.family == AF_UNSPEC)
191                                 return 1;
192                         break;
193                 case 'p':
194                         if (parse_ports(optarg, &min_port, &max_port))
195                                 return 1;
196                         break;
197                 case 'P':
198                         vip.protocol = atoi(optarg);
199                         break;
200                 case 's':
201                 case 'd':
202                         if (opt == 's')
203                                 v6 = tnl.saddr.v6;
204                         else
205                                 v6 = tnl.daddr.v6;
206 
207                         family = parse_ipstr(optarg, v6);
208                         if (family == AF_UNSPEC)
209                                 return 1;
210                         if (tnl.family == AF_UNSPEC) {
211                                 tnl.family = family;
212                         } else if (tnl.family != family) {
213                                 fprintf(stderr,
214                                         "The IP version of the src and dst addresses used in the IP encapsulation does not match\n");
215                                 return 1;
216                         }
217                         break;
218                 case 'm':
219                         if (!ether_aton_r(optarg,
220                                           (struct ether_addr *)tnl.dmac)) {
221                                 fprintf(stderr, "Invalid mac address:%s\n",
222                                         optarg);
223                                 return 1;
224                         }
225                         break;
226                 case 'T':
227                         kill_after_s = atoi(optarg);
228                         break;
229                 case 'S':
230                         xdp_flags |= XDP_FLAGS_SKB_MODE;
231                         break;
232                 case 'N':
233                         /* default, set below */
234                         break;
235                 case 'F':
236                         xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
237                         break;
238                 default:
239                         usage(argv[0]);
240                         return 1;
241                 }
242                 opt_flags[opt] = 0;
243         }
244 
245         if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
246                 xdp_flags |= XDP_FLAGS_DRV_MODE;
247 
248         for (i = 0; i < strlen(optstr); i++) {
249                 if (opt_flags[(unsigned int)optstr[i]]) {
250                         fprintf(stderr, "Missing argument -%c\n", optstr[i]);
251                         usage(argv[0]);
252                         return 1;
253                 }
254         }
255 
256         if (!ifindex) {
257                 fprintf(stderr, "Invalid ifname\n");
258                 return 1;
259         }
260 
261         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
262         prog_load_attr.file = filename;
263 
264         if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
265                 return 1;
266 
267         if (!prog_fd) {
268                 printf("bpf_prog_load_xattr: %s\n", strerror(errno));
269                 return 1;
270         }
271 
272         rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
273         vip2tnl_map_fd = bpf_object__find_map_fd_by_name(obj, "vip2tnl");
274         if (vip2tnl_map_fd < 0 || rxcnt_map_fd < 0) {
275                 printf("bpf_object__find_map_fd_by_name failed\n");
276                 return 1;
277         }
278 
279         signal(SIGINT, int_exit);
280         signal(SIGTERM, int_exit);
281 
282         while (min_port <= max_port) {
283                 vip.dport = htons(min_port++);
284                 if (bpf_map_update_elem(vip2tnl_map_fd, &vip, &tnl,
285                                         BPF_NOEXIST)) {
286                         perror("bpf_map_update_elem(&vip2tnl)");
287                         return 1;
288                 }
289         }
290 
291         if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
292                 printf("link set xdp fd failed\n");
293                 return 1;
294         }
295 
296         err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
297         if (err) {
298                 printf("can't get prog info - %s\n", strerror(errno));
299                 return err;
300         }
301         prog_id = info.id;
302 
303         poll_stats(kill_after_s);
304 
305         bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
306 
307         return 0;
308 }
309 

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