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:
parent
95e22792fa
commit
30da679e67
|
@ -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,
|
||||
|
|
Loading…
Reference in a new issue