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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>
This commit is contained in:
Willem de Bruijn 2015-08-14 22:31:37 -04:00 committed by David S. Miller
parent 95e22792fa
commit 30da679e67
1 changed files with 53 additions and 0 deletions
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53
tools/testing/selftests/net/psock_fanout.c
View File

@ -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,