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authorAlexei Starovoitov <ast@plumgrid.com>2014-12-02 02:06:39 +0300
committerDavid S. Miller <davem@davemloft.net>2014-12-06 08:47:34 +0300
commitfbe3310840c65f3cf97dd90d23e177d061c376f2 (patch)
treeee28163a6c53e0131fd2d3d626d02b0610eaed2b /samples/bpf/sockex2_user.c
parenta80857822b0c2ed608c93504bd3687b78f20c619 (diff)
downloadlinux-fbe3310840c65f3cf97dd90d23e177d061c376f2.tar.xz
samples: bpf: large eBPF program in C
sockex2_kern.c is purposefully large eBPF program in C. llvm compiles ~200 lines of C code into ~300 eBPF instructions. It's similar to __skb_flow_dissect() to demonstrate that complex packet parsing can be done by eBPF. Then it uses (struct flow_keys)->dst IP address (or hash of ipv6 dst) to keep stats of number of packets per IP. User space loads eBPF program, attaches it to loopback interface and prints dest_ip->#packets stats every second. Usage: $sudo samples/bpf/sockex2 ip 127.0.0.1 count 19 ip 127.0.0.1 count 178115 ip 127.0.0.1 count 369437 ip 127.0.0.1 count 559841 ip 127.0.0.1 count 750539 Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/sockex2_user.c')
-rw-r--r--samples/bpf/sockex2_user.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/samples/bpf/sockex2_user.c b/samples/bpf/sockex2_user.c
new file mode 100644
index 000000000000..d2d5f5a790d3
--- /dev/null
+++ b/samples/bpf/sockex2_user.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <assert.h>
+#include <linux/bpf.h>
+#include "libbpf.h"
+#include "bpf_load.h"
+#include <unistd.h>
+#include <arpa/inet.h>
+
+int main(int ac, char **argv)
+{
+ char filename[256];
+ FILE *f;
+ int i, sock;
+
+ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+
+ if (load_bpf_file(filename)) {
+ printf("%s", bpf_log_buf);
+ return 1;
+ }
+
+ sock = open_raw_sock("lo");
+
+ assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
+ sizeof(prog_fd[0])) == 0);
+
+ f = popen("ping -c5 localhost", "r");
+ (void) f;
+
+ for (i = 0; i < 5; i++) {
+ int key = 0, next_key;
+ long long value;
+
+ while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) {
+ bpf_lookup_elem(map_fd[0], &next_key, &value);
+ printf("ip %s count %lld\n",
+ inet_ntoa((struct in_addr){htonl(next_key)}),
+ value);
+ key = next_key;
+ }
+ sleep(1);
+ }
+ return 0;
+}