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authorAlexei Starovoitov <ast@plumgrid.com>2014-12-01 18:06:38 -0500
committerDavid S. Miller <davem@davemloft.net>2014-12-06 00:47:33 -0500
commita80857822b0c2ed608c93504bd3687b78f20c619 (patch)
tree8fb218a13a13a16d5083c7b831398f967137f152 /samples/bpf
parent249b812d8005ec38e351ee763ceb85d56b155064 (diff)
samples: bpf: trivial eBPF program in C
this example does the same task as previous socket example in assembler, but this one does it in C. eBPF program in kernel does: /* assume that packet is IPv4, load one byte of IP->proto */ int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol)); long *value; value = bpf_map_lookup_elem(&my_map, &index); if (value) __sync_fetch_and_add(value, 1); Corresponding user space reads map[tcp], map[udp], map[icmp] and prints protocol stats every second Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf')
-rw-r--r--samples/bpf/Makefile14
-rw-r--r--samples/bpf/libbpf.h2
-rw-r--r--samples/bpf/sockex1_kern.c25
-rw-r--r--samples/bpf/sockex1_user.c49
4 files changed, 89 insertions, 1 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index f46d3492d032..770d145186c3 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -4,12 +4,26 @@ obj- := dummy.o
4# List of programs to build 4# List of programs to build
5hostprogs-y := test_verifier test_maps 5hostprogs-y := test_verifier test_maps
6hostprogs-y += sock_example 6hostprogs-y += sock_example
7hostprogs-y += sockex1
7 8
8test_verifier-objs := test_verifier.o libbpf.o 9test_verifier-objs := test_verifier.o libbpf.o
9test_maps-objs := test_maps.o libbpf.o 10test_maps-objs := test_maps.o libbpf.o
10sock_example-objs := sock_example.o libbpf.o 11sock_example-objs := sock_example.o libbpf.o
12sockex1-objs := bpf_load.o libbpf.o sockex1_user.o
11 13
12# Tell kbuild to always build the programs 14# Tell kbuild to always build the programs
13always := $(hostprogs-y) 15always := $(hostprogs-y)
16always += sockex1_kern.o
14 17
15HOSTCFLAGS += -I$(objtree)/usr/include 18HOSTCFLAGS += -I$(objtree)/usr/include
19
20HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable
21HOSTLOADLIBES_sockex1 += -lelf
22
23# point this to your LLVM backend with bpf support
24LLC=$(srctree)/tools/bpf/llvm/bld/Debug+Asserts/bin/llc
25
26%.o: %.c
27 clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
28 -D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
29 -O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
diff --git a/samples/bpf/libbpf.h b/samples/bpf/libbpf.h
index cc62ad4d95de..58c5fe1bdba1 100644
--- a/samples/bpf/libbpf.h
+++ b/samples/bpf/libbpf.h
@@ -15,7 +15,7 @@ int bpf_prog_load(enum bpf_prog_type prog_type,
15 const struct bpf_insn *insns, int insn_len, 15 const struct bpf_insn *insns, int insn_len,
16 const char *license); 16 const char *license);
17 17
18#define LOG_BUF_SIZE 8192 18#define LOG_BUF_SIZE 65536
19extern char bpf_log_buf[LOG_BUF_SIZE]; 19extern char bpf_log_buf[LOG_BUF_SIZE];
20 20
21/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ 21/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
diff --git a/samples/bpf/sockex1_kern.c b/samples/bpf/sockex1_kern.c
new file mode 100644
index 000000000000..066892662915
--- /dev/null
+++ b/samples/bpf/sockex1_kern.c
@@ -0,0 +1,25 @@
1#include <uapi/linux/bpf.h>
2#include <uapi/linux/if_ether.h>
3#include <uapi/linux/ip.h>
4#include "bpf_helpers.h"
5
6struct bpf_map_def SEC("maps") my_map = {
7 .type = BPF_MAP_TYPE_ARRAY,
8 .key_size = sizeof(u32),
9 .value_size = sizeof(long),
10 .max_entries = 256,
11};
12
13SEC("socket1")
14int bpf_prog1(struct sk_buff *skb)
15{
16 int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol));
17 long *value;
18
19 value = bpf_map_lookup_elem(&my_map, &index);
20 if (value)
21 __sync_fetch_and_add(value, 1);
22
23 return 0;
24}
25char _license[] SEC("license") = "GPL";
diff --git a/samples/bpf/sockex1_user.c b/samples/bpf/sockex1_user.c
new file mode 100644
index 000000000000..34a443ff3831
--- /dev/null
+++ b/samples/bpf/sockex1_user.c
@@ -0,0 +1,49 @@
1#include <stdio.h>
2#include <assert.h>
3#include <linux/bpf.h>
4#include "libbpf.h"
5#include "bpf_load.h"
6#include <unistd.h>
7#include <arpa/inet.h>
8
9int main(int ac, char **argv)
10{
11 char filename[256];
12 FILE *f;
13 int i, sock;
14
15 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
16
17 if (load_bpf_file(filename)) {
18 printf("%s", bpf_log_buf);
19 return 1;
20 }
21
22 sock = open_raw_sock("lo");
23
24 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
25 sizeof(prog_fd[0])) == 0);
26
27 f = popen("ping -c5 localhost", "r");
28 (void) f;
29
30 for (i = 0; i < 5; i++) {
31 long long tcp_cnt, udp_cnt, icmp_cnt;
32 int key;
33
34 key = IPPROTO_TCP;
35 assert(bpf_lookup_elem(map_fd[0], &key, &tcp_cnt) == 0);
36
37 key = IPPROTO_UDP;
38 assert(bpf_lookup_elem(map_fd[0], &key, &udp_cnt) == 0);
39
40 key = IPPROTO_ICMP;
41 assert(bpf_lookup_elem(map_fd[0], &key, &icmp_cnt) == 0);
42
43 printf("TCP %lld UDP %lld ICMP %lld packets\n",
44 tcp_cnt, udp_cnt, icmp_cnt);
45 sleep(1);
46 }
47
48 return 0;
49}