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authorWillem de Bruijn <willemb@google.com>2015-08-15 05:31:37 +0300
committerDavid S. Miller <davem@davemloft.net>2015-08-18 00:22:48 +0300
commit30da679e679dbe7bb103c5d9c137ec5a070b7150 (patch)
treeb2a932691177a1608f4c91016eea0a71c244987f /tools
parent95e22792fa5460e579a69171777ff79d8725be29 (diff)
downloadlinux-30da679e679dbe7bb103c5d9c137ec5a070b7150.tar.xz
selftests/net: test extended BPF fanout mode
Test PACKET_FANOUT_EBPF by inserting a program into the the kernel with bpf(), then attaching it to the fanout group. Observe the same payload-based distribution as in the PACKET_FANOUT_CBPF test. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/net/psock_fanout.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/tools/testing/selftests/net/psock_fanout.c b/tools/testing/selftests/net/psock_fanout.c
index baf46a20e1b3..412459369686 100644
--- a/tools/testing/selftests/net/psock_fanout.c
+++ b/tools/testing/selftests/net/psock_fanout.c
@@ -20,6 +20,7 @@
* - PACKET_FANOUT_CPU
* - PACKET_FANOUT_ROLLOVER
* - PACKET_FANOUT_CBPF
+ * - PACKET_FANOUT_EBPF
*
* Todo:
* - functionality: PACKET_FANOUT_FLAG_DEFRAG
@@ -45,7 +46,9 @@
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
+#include <linux/unistd.h> /* for __NR_bpf */
#include <linux/filter.h>
+#include <linux/bpf.h>
#include <linux/if_packet.h>
#include <net/ethernet.h>
#include <netinet/ip.h>
@@ -92,6 +95,51 @@ static int sock_fanout_open(uint16_t typeflags, int num_packets)
return fd;
}
+static void sock_fanout_set_ebpf(int fd)
+{
+ const int len_off = __builtin_offsetof(struct __sk_buff, len);
+ struct bpf_insn prog[] = {
+ { BPF_ALU64 | BPF_MOV | BPF_X, 6, 1, 0, 0 },
+ { BPF_LDX | BPF_W | BPF_MEM, 0, 6, len_off, 0 },
+ { BPF_JMP | BPF_JGE | BPF_K, 0, 0, 1, DATA_LEN },
+ { BPF_JMP | BPF_JA | BPF_K, 0, 0, 4, 0 },
+ { BPF_LD | BPF_B | BPF_ABS, 0, 0, 0, 0x50 },
+ { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 2, DATA_CHAR },
+ { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 1, DATA_CHAR_1 },
+ { BPF_ALU | BPF_MOV | BPF_K, 0, 0, 0, 0 },
+ { BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
+ };
+ char log_buf[512];
+ union bpf_attr attr;
+ int pfd;
+
+ memset(&attr, 0, sizeof(attr));
+ attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
+ attr.insns = (unsigned long) prog;
+ attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
+ attr.license = (unsigned long) "GPL";
+ attr.log_buf = (unsigned long) log_buf,
+ attr.log_size = sizeof(log_buf),
+ attr.log_level = 1,
+
+ pfd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
+ if (pfd < 0) {
+ perror("bpf");
+ fprintf(stderr, "bpf verifier:\n%s\n", log_buf);
+ exit(1);
+ }
+
+ if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &pfd, sizeof(pfd))) {
+ perror("fanout data ebpf");
+ exit(1);
+ }
+
+ if (close(pfd)) {
+ perror("close ebpf");
+ exit(1);
+ }
+}
+
static char *sock_fanout_open_ring(int fd)
{
struct tpacket_req req = {
@@ -223,6 +271,8 @@ static int test_datapath(uint16_t typeflags, int port_off,
}
if (type == PACKET_FANOUT_CBPF)
sock_setfilter(fds[0], SOL_PACKET, PACKET_FANOUT_DATA);
+ else if (type == PACKET_FANOUT_EBPF)
+ sock_fanout_set_ebpf(fds[0]);
rings[0] = sock_fanout_open_ring(fds[0]);
rings[1] = sock_fanout_open_ring(fds[1]);
@@ -301,8 +351,11 @@ int main(int argc, char **argv)
port_off, expect_lb[0], expect_lb[1]);
ret |= test_datapath(PACKET_FANOUT_ROLLOVER,
port_off, expect_rb[0], expect_rb[1]);
+
ret |= test_datapath(PACKET_FANOUT_CBPF,
port_off, expect_bpf[0], expect_bpf[1]);
+ ret |= test_datapath(PACKET_FANOUT_EBPF,
+ port_off, expect_bpf[0], expect_bpf[1]);
set_cpuaffinity(0);
ret |= test_datapath(PACKET_FANOUT_CPU, port_off,