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Linux/samples/bpf/xdp1_user.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* Copyright (c) 2016 PLUMgrid
  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 <unistd.h>
 13 #include <libgen.h>
 14 #include <sys/resource.h>
 15 #include <net/if.h>
 16 
 17 #include "bpf_util.h"
 18 #include "bpf.h"
 19 #include "libbpf.h"
 20 
 21 static int ifindex;
 22 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 23 static __u32 prog_id;
 24 
 25 static void int_exit(int sig)
 26 {
 27         __u32 curr_prog_id = 0;
 28 
 29         if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
 30                 printf("bpf_get_link_xdp_id failed\n");
 31                 exit(1);
 32         }
 33         if (prog_id == curr_prog_id)
 34                 bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
 35         else if (!curr_prog_id)
 36                 printf("couldn't find a prog id on a given interface\n");
 37         else
 38                 printf("program on interface changed, not removing\n");
 39         exit(0);
 40 }
 41 
 42 /* simple per-protocol drop counter
 43  */
 44 static void poll_stats(int map_fd, int interval)
 45 {
 46         unsigned int nr_cpus = bpf_num_possible_cpus();
 47         __u64 values[nr_cpus], prev[UINT8_MAX] = { 0 };
 48         int i;
 49 
 50         while (1) {
 51                 __u32 key = UINT32_MAX;
 52 
 53                 sleep(interval);
 54 
 55                 while (bpf_map_get_next_key(map_fd, &key, &key) != -1) {
 56                         __u64 sum = 0;
 57 
 58                         assert(bpf_map_lookup_elem(map_fd, &key, values) == 0);
 59                         for (i = 0; i < nr_cpus; i++)
 60                                 sum += values[i];
 61                         if (sum > prev[key])
 62                                 printf("proto %u: %10llu pkt/s\n",
 63                                        key, (sum - prev[key]) / interval);
 64                         prev[key] = sum;
 65                 }
 66         }
 67 }
 68 
 69 static void usage(const char *prog)
 70 {
 71         fprintf(stderr,
 72                 "usage: %s [OPTS] IFACE\n\n"
 73                 "OPTS:\n"
 74                 "    -S    use skb-mode\n"
 75                 "    -N    enforce native mode\n"
 76                 "    -F    force loading prog\n",
 77                 prog);
 78 }
 79 
 80 int main(int argc, char **argv)
 81 {
 82         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 83         struct bpf_prog_load_attr prog_load_attr = {
 84                 .prog_type      = BPF_PROG_TYPE_XDP,
 85         };
 86         struct bpf_prog_info info = {};
 87         __u32 info_len = sizeof(info);
 88         const char *optstr = "FSN";
 89         int prog_fd, map_fd, opt;
 90         struct bpf_object *obj;
 91         struct bpf_map *map;
 92         char filename[256];
 93         int err;
 94 
 95         while ((opt = getopt(argc, argv, optstr)) != -1) {
 96                 switch (opt) {
 97                 case 'S':
 98                         xdp_flags |= XDP_FLAGS_SKB_MODE;
 99                         break;
100                 case 'N':
101                         xdp_flags |= XDP_FLAGS_DRV_MODE;
102                         break;
103                 case 'F':
104                         xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
105                         break;
106                 default:
107                         usage(basename(argv[0]));
108                         return 1;
109                 }
110         }
111 
112         if (optind == argc) {
113                 usage(basename(argv[0]));
114                 return 1;
115         }
116 
117         if (setrlimit(RLIMIT_MEMLOCK, &r)) {
118                 perror("setrlimit(RLIMIT_MEMLOCK)");
119                 return 1;
120         }
121 
122         ifindex = if_nametoindex(argv[optind]);
123         if (!ifindex) {
124                 perror("if_nametoindex");
125                 return 1;
126         }
127 
128         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
129         prog_load_attr.file = filename;
130 
131         if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
132                 return 1;
133 
134         map = bpf_map__next(NULL, obj);
135         if (!map) {
136                 printf("finding a map in obj file failed\n");
137                 return 1;
138         }
139         map_fd = bpf_map__fd(map);
140 
141         if (!prog_fd) {
142                 printf("load_bpf_file: %s\n", strerror(errno));
143                 return 1;
144         }
145 
146         signal(SIGINT, int_exit);
147         signal(SIGTERM, int_exit);
148 
149         if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
150                 printf("link set xdp fd failed\n");
151                 return 1;
152         }
153 
154         err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
155         if (err) {
156                 printf("can't get prog info - %s\n", strerror(errno));
157                 return err;
158         }
159         prog_id = info.id;
160 
161         poll_stats(map_fd, 2);
162 
163         return 0;
164 }
165 

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