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12d8bb64 MKL |
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 <assert.h> | |
9 | #include <errno.h> | |
10 | #include <signal.h> | |
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <string.h> | |
14 | #include <sys/resource.h> | |
15 | #include <arpa/inet.h> | |
16 | #include <netinet/ether.h> | |
17 | #include <unistd.h> | |
18 | #include <time.h> | |
19 | #include "bpf_load.h" | |
20 | #include "libbpf.h" | |
21 | #include "bpf_util.h" | |
22 | #include "xdp_tx_iptunnel_common.h" | |
23 | ||
24 | #define STATS_INTERVAL_S 2U | |
25 | ||
26 | static int ifindex = -1; | |
27 | ||
28 | static void int_exit(int sig) | |
29 | { | |
30 | if (ifindex > -1) | |
31 | set_link_xdp_fd(ifindex, -1); | |
32 | exit(0); | |
33 | } | |
34 | ||
35 | /* simple per-protocol drop counter | |
36 | */ | |
37 | static void poll_stats(unsigned int kill_after_s) | |
38 | { | |
39 | const unsigned int nr_protos = 256; | |
40 | unsigned int nr_cpus = bpf_num_possible_cpus(); | |
41 | time_t started_at = time(NULL); | |
42 | __u64 values[nr_cpus], prev[nr_protos][nr_cpus]; | |
43 | __u32 proto; | |
44 | int i; | |
45 | ||
46 | memset(prev, 0, sizeof(prev)); | |
47 | ||
48 | while (!kill_after_s || time(NULL) - started_at <= kill_after_s) { | |
49 | sleep(STATS_INTERVAL_S); | |
50 | ||
51 | for (proto = 0; proto < nr_protos; proto++) { | |
52 | __u64 sum = 0; | |
53 | ||
54 | assert(bpf_lookup_elem(map_fd[0], &proto, values) == 0); | |
55 | for (i = 0; i < nr_cpus; i++) | |
56 | sum += (values[i] - prev[proto][i]); | |
57 | ||
58 | if (sum) | |
59 | printf("proto %u: sum:%10llu pkts, rate:%10llu pkts/s\n", | |
60 | proto, sum, sum / STATS_INTERVAL_S); | |
61 | memcpy(prev[proto], values, sizeof(values)); | |
62 | } | |
63 | } | |
64 | } | |
65 | ||
66 | static void usage(const char *cmd) | |
67 | { | |
68 | printf("Start a XDP prog which encapsulates incoming packets\n" | |
69 | "in an IPv4/v6 header and XDP_TX it out. The dst <VIP:PORT>\n" | |
70 | "is used to select packets to encapsulate\n\n"); | |
71 | printf("Usage: %s [...]\n", cmd); | |
72 | printf(" -i <ifindex> Interface Index\n"); | |
73 | printf(" -a <vip-service-address> IPv4 or IPv6\n"); | |
74 | printf(" -p <vip-service-port> A port range (e.g. 433-444) is also allowed\n"); | |
75 | printf(" -s <source-ip> Used in the IPTunnel header\n"); | |
76 | printf(" -d <dest-ip> Used in the IPTunnel header\n"); | |
77 | printf(" -m <dest-MAC> Used in sending the IP Tunneled pkt\n"); | |
78 | printf(" -T <stop-after-X-seconds> Default: 0 (forever)\n"); | |
79 | printf(" -P <IP-Protocol> Default is TCP\n"); | |
80 | printf(" -h Display this help\n"); | |
81 | } | |
82 | ||
83 | static int parse_ipstr(const char *ipstr, unsigned int *addr) | |
84 | { | |
85 | if (inet_pton(AF_INET6, ipstr, addr) == 1) { | |
86 | return AF_INET6; | |
87 | } else if (inet_pton(AF_INET, ipstr, addr) == 1) { | |
88 | addr[1] = addr[2] = addr[3] = 0; | |
89 | return AF_INET; | |
90 | } | |
91 | ||
92 | fprintf(stderr, "%s is an invalid IP\n", ipstr); | |
93 | return AF_UNSPEC; | |
94 | } | |
95 | ||
96 | static int parse_ports(const char *port_str, int *min_port, int *max_port) | |
97 | { | |
98 | char *end; | |
99 | long tmp_min_port; | |
100 | long tmp_max_port; | |
101 | ||
102 | tmp_min_port = strtol(optarg, &end, 10); | |
103 | if (tmp_min_port < 1 || tmp_min_port > 65535) { | |
104 | fprintf(stderr, "Invalid port(s):%s\n", optarg); | |
105 | return 1; | |
106 | } | |
107 | ||
108 | if (*end == '-') { | |
109 | end++; | |
110 | tmp_max_port = strtol(end, NULL, 10); | |
111 | if (tmp_max_port < 1 || tmp_max_port > 65535) { | |
112 | fprintf(stderr, "Invalid port(s):%s\n", optarg); | |
113 | return 1; | |
114 | } | |
115 | } else { | |
116 | tmp_max_port = tmp_min_port; | |
117 | } | |
118 | ||
119 | if (tmp_min_port > tmp_max_port) { | |
120 | fprintf(stderr, "Invalid port(s):%s\n", optarg); | |
121 | return 1; | |
122 | } | |
123 | ||
124 | if (tmp_max_port - tmp_min_port + 1 > MAX_IPTNL_ENTRIES) { | |
125 | fprintf(stderr, "Port range (%s) is larger than %u\n", | |
126 | port_str, MAX_IPTNL_ENTRIES); | |
127 | return 1; | |
128 | } | |
129 | *min_port = tmp_min_port; | |
130 | *max_port = tmp_max_port; | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | int main(int argc, char **argv) | |
136 | { | |
137 | unsigned char opt_flags[256] = {}; | |
138 | unsigned int kill_after_s = 0; | |
139 | const char *optstr = "i:a:p:s:d:m:T:P:h"; | |
140 | int min_port = 0, max_port = 0; | |
141 | struct iptnl_info tnl = {}; | |
142 | struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; | |
143 | struct vip vip = {}; | |
144 | char filename[256]; | |
145 | int opt; | |
146 | int i; | |
147 | ||
148 | tnl.family = AF_UNSPEC; | |
149 | vip.protocol = IPPROTO_TCP; | |
150 | ||
151 | for (i = 0; i < strlen(optstr); i++) | |
152 | if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z') | |
153 | opt_flags[(unsigned char)optstr[i]] = 1; | |
154 | ||
155 | while ((opt = getopt(argc, argv, optstr)) != -1) { | |
156 | unsigned short family; | |
157 | unsigned int *v6; | |
158 | ||
159 | switch (opt) { | |
160 | case 'i': | |
161 | ifindex = atoi(optarg); | |
162 | break; | |
163 | case 'a': | |
164 | vip.family = parse_ipstr(optarg, vip.daddr.v6); | |
165 | if (vip.family == AF_UNSPEC) | |
166 | return 1; | |
167 | break; | |
168 | case 'p': | |
169 | if (parse_ports(optarg, &min_port, &max_port)) | |
170 | return 1; | |
171 | break; | |
172 | case 'P': | |
173 | vip.protocol = atoi(optarg); | |
174 | break; | |
175 | case 's': | |
176 | case 'd': | |
177 | if (opt == 's') | |
178 | v6 = tnl.saddr.v6; | |
179 | else | |
180 | v6 = tnl.daddr.v6; | |
181 | ||
182 | family = parse_ipstr(optarg, v6); | |
183 | if (family == AF_UNSPEC) | |
184 | return 1; | |
185 | if (tnl.family == AF_UNSPEC) { | |
186 | tnl.family = family; | |
187 | } else if (tnl.family != family) { | |
188 | fprintf(stderr, | |
189 | "The IP version of the src and dst addresses used in the IP encapsulation does not match\n"); | |
190 | return 1; | |
191 | } | |
192 | break; | |
193 | case 'm': | |
194 | if (!ether_aton_r(optarg, | |
195 | (struct ether_addr *)tnl.dmac)) { | |
196 | fprintf(stderr, "Invalid mac address:%s\n", | |
197 | optarg); | |
198 | return 1; | |
199 | } | |
200 | break; | |
201 | case 'T': | |
202 | kill_after_s = atoi(optarg); | |
203 | break; | |
204 | default: | |
205 | usage(argv[0]); | |
206 | return 1; | |
207 | } | |
208 | opt_flags[opt] = 0; | |
209 | } | |
210 | ||
211 | for (i = 0; i < strlen(optstr); i++) { | |
212 | if (opt_flags[(unsigned int)optstr[i]]) { | |
213 | fprintf(stderr, "Missing argument -%c\n", optstr[i]); | |
214 | usage(argv[0]); | |
215 | return 1; | |
216 | } | |
217 | } | |
218 | ||
219 | if (setrlimit(RLIMIT_MEMLOCK, &r)) { | |
220 | perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)"); | |
221 | return 1; | |
222 | } | |
223 | ||
224 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); | |
225 | ||
226 | if (load_bpf_file(filename)) { | |
227 | printf("%s", bpf_log_buf); | |
228 | return 1; | |
229 | } | |
230 | ||
231 | if (!prog_fd[0]) { | |
232 | printf("load_bpf_file: %s\n", strerror(errno)); | |
233 | return 1; | |
234 | } | |
235 | ||
236 | signal(SIGINT, int_exit); | |
237 | ||
238 | while (min_port <= max_port) { | |
239 | vip.dport = htons(min_port++); | |
240 | if (bpf_update_elem(map_fd[1], &vip, &tnl, BPF_NOEXIST)) { | |
241 | perror("bpf_update_elem(&vip2tnl)"); | |
242 | return 1; | |
243 | } | |
244 | } | |
245 | ||
246 | if (set_link_xdp_fd(ifindex, prog_fd[0]) < 0) { | |
247 | printf("link set xdp fd failed\n"); | |
248 | return 1; | |
249 | } | |
250 | ||
251 | poll_stats(kill_after_s); | |
252 | ||
253 | set_link_xdp_fd(ifindex, -1); | |
254 | ||
255 | return 0; | |
256 | } |