soreuseport: BPF selection functional test
This program will build classic and extended BPF programs and validate the socket selection logic when used with SO_ATTACH_REUSEPORT_CBPF and SO_ATTACH_REUSEPORT_EBPF. It also validates the re-programing flow and several edge cases. Signed-off-by: Craig Gallek <kraig@google.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Craig Gallek
David S. Miller
Родитель
538950a1b7
Коммит
3ca8e40299
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@ -1,3 +1,4 @@
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socket
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psock_fanout
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psock_tpacket
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reuseport_bpf
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@ -4,7 +4,7 @@ CFLAGS = -Wall -O2 -g
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CFLAGS += -I../../../../usr/include/
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NET_PROGS = socket psock_fanout psock_tpacket
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NET_PROGS = socket psock_fanout psock_tpacket reuseport_bpf
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all: $(NET_PROGS)
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%: %.c
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@ -0,0 +1,467 @@
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/*
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* Test functionality of BPF filters for SO_REUSEPORT. The tests below will use
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* a BPF program (both classic and extended) to read the first word from an
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* incoming packet (expected to be in network byte-order), calculate a modulus
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* of that number, and then dispatch the packet to the Nth socket using the
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* result. These tests are run for each supported address family and protocol.
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* Additionally, a few edge cases in the implementation are tested.
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*/
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#include <errno.h>
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#include <error.h>
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#include <linux/bpf.h>
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#include <linux/filter.h>
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#include <linux/unistd.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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#endif
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struct test_params {
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int recv_family;
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int send_family;
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int protocol;
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size_t recv_socks;
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uint16_t recv_port;
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uint16_t send_port_min;
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};
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static size_t sockaddr_size(void)
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{
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return sizeof(struct sockaddr_storage);
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}
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static struct sockaddr *new_any_sockaddr(int family, uint16_t port)
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{
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struct sockaddr_storage *addr;
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struct sockaddr_in *addr4;
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struct sockaddr_in6 *addr6;
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addr = malloc(sizeof(struct sockaddr_storage));
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memset(addr, 0, sizeof(struct sockaddr_storage));
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switch (family) {
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case AF_INET:
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addr4 = (struct sockaddr_in *)addr;
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addr4->sin_family = AF_INET;
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addr4->sin_addr.s_addr = htonl(INADDR_ANY);
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addr4->sin_port = htons(port);
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break;
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case AF_INET6:
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addr6 = (struct sockaddr_in6 *)addr;
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addr6->sin6_family = AF_INET6;
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addr6->sin6_addr = in6addr_any;
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addr6->sin6_port = htons(port);
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break;
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default:
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error(1, 0, "Unsupported family %d", family);
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}
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return (struct sockaddr *)addr;
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}
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static struct sockaddr *new_loopback_sockaddr(int family, uint16_t port)
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{
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struct sockaddr *addr = new_any_sockaddr(family, port);
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struct sockaddr_in *addr4;
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struct sockaddr_in6 *addr6;
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switch (family) {
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case AF_INET:
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addr4 = (struct sockaddr_in *)addr;
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addr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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break;
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case AF_INET6:
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addr6 = (struct sockaddr_in6 *)addr;
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addr6->sin6_addr = in6addr_loopback;
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break;
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default:
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error(1, 0, "Unsupported family %d", family);
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}
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return addr;
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}
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static void attach_ebpf(int fd, uint16_t mod)
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{
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static char bpf_log_buf[65536];
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static const char bpf_license[] = "GPL";
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int bpf_fd;
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const struct bpf_insn prog[] = {
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/* BPF_MOV64_REG(BPF_REG_6, BPF_REG_1) */
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{ BPF_ALU64 | BPF_MOV | BPF_X, BPF_REG_6, BPF_REG_1, 0, 0 },
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/* BPF_LD_ABS(BPF_W, 0) R0 = (uint32_t)skb[0] */
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{ BPF_LD | BPF_ABS | BPF_W, 0, 0, 0, 0 },
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/* BPF_ALU64_IMM(BPF_MOD, BPF_REG_0, mod) */
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{ BPF_ALU64 | BPF_MOD | BPF_K, BPF_REG_0, 0, 0, mod },
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/* BPF_EXIT_INSN() */
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{ BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
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};
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union bpf_attr attr;
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memset(&attr, 0, sizeof(attr));
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attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
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attr.insn_cnt = ARRAY_SIZE(prog);
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attr.insns = (uint64_t)prog;
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attr.license = (uint64_t)bpf_license;
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attr.log_buf = (uint64_t)bpf_log_buf;
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attr.log_size = sizeof(bpf_log_buf);
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attr.log_level = 1;
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attr.kern_version = 0;
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bpf_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
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if (bpf_fd < 0)
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error(1, errno, "ebpf error. log:\n%s\n", bpf_log_buf);
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if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &bpf_fd,
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sizeof(bpf_fd)))
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error(1, errno, "failed to set SO_ATTACH_REUSEPORT_EBPF");
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}
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static void attach_cbpf(int fd, uint16_t mod)
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{
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struct sock_filter code[] = {
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/* A = (uint32_t)skb[0] */
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{ BPF_LD | BPF_W | BPF_ABS, 0, 0, 0 },
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/* A = A % mod */
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{ BPF_ALU | BPF_MOD, 0, 0, mod },
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/* return A */
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{ BPF_RET | BPF_A, 0, 0, 0 },
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};
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struct sock_fprog p = {
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.len = ARRAY_SIZE(code),
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.filter = code,
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};
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if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_CBPF, &p, sizeof(p)))
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error(1, errno, "failed to set SO_ATTACH_REUSEPORT_CBPF");
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}
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static void build_recv_group(const struct test_params p, int fd[], uint16_t mod,
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void (*attach_bpf)(int, uint16_t))
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{
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struct sockaddr * const addr =
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new_any_sockaddr(p.recv_family, p.recv_port);
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int i, opt;
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for (i = 0; i < p.recv_socks; ++i) {
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fd[i] = socket(p.recv_family, p.protocol, 0);
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if (fd[i] < 0)
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error(1, errno, "failed to create recv %d", i);
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opt = 1;
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if (setsockopt(fd[i], SOL_SOCKET, SO_REUSEPORT, &opt,
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sizeof(opt)))
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error(1, errno, "failed to set SO_REUSEPORT on %d", i);
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if (i == 0)
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attach_bpf(fd[i], mod);
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if (bind(fd[i], addr, sockaddr_size()))
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error(1, errno, "failed to bind recv socket %d", i);
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if (p.protocol == SOCK_STREAM)
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if (listen(fd[i], p.recv_socks * 10))
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error(1, errno, "failed to listen on socket");
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}
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free(addr);
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}
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static void send_from(struct test_params p, uint16_t sport, char *buf,
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size_t len)
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{
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struct sockaddr * const saddr = new_any_sockaddr(p.send_family, sport);
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struct sockaddr * const daddr =
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new_loopback_sockaddr(p.send_family, p.recv_port);
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const int fd = socket(p.send_family, p.protocol, 0);
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if (fd < 0)
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error(1, errno, "failed to create send socket");
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if (bind(fd, saddr, sockaddr_size()))
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error(1, errno, "failed to bind send socket");
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if (connect(fd, daddr, sockaddr_size()))
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error(1, errno, "failed to connect");
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if (send(fd, buf, len, 0) < 0)
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error(1, errno, "failed to send message");
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close(fd);
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free(saddr);
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free(daddr);
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}
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static void test_recv_order(const struct test_params p, int fd[], int mod)
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{
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char recv_buf[8], send_buf[8];
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struct msghdr msg;
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struct iovec recv_io = { recv_buf, 8 };
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struct epoll_event ev;
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int epfd, conn, i, sport, expected;
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uint32_t data, ndata;
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epfd = epoll_create(1);
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if (epfd < 0)
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error(1, errno, "failed to create epoll");
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for (i = 0; i < p.recv_socks; ++i) {
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ev.events = EPOLLIN;
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ev.data.fd = fd[i];
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if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd[i], &ev))
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error(1, errno, "failed to register sock %d epoll", i);
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}
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memset(&msg, 0, sizeof(msg));
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msg.msg_iov = &recv_io;
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msg.msg_iovlen = 1;
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for (data = 0; data < p.recv_socks * 2; ++data) {
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sport = p.send_port_min + data;
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ndata = htonl(data);
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memcpy(send_buf, &ndata, sizeof(ndata));
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send_from(p, sport, send_buf, sizeof(ndata));
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i = epoll_wait(epfd, &ev, 1, -1);
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if (i < 0)
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error(1, errno, "epoll wait failed");
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if (p.protocol == SOCK_STREAM) {
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conn = accept(ev.data.fd, NULL, NULL);
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if (conn < 0)
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error(1, errno, "error accepting");
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i = recvmsg(conn, &msg, 0);
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close(conn);
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} else {
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i = recvmsg(ev.data.fd, &msg, 0);
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}
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if (i < 0)
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error(1, errno, "recvmsg error");
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if (i != sizeof(ndata))
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error(1, 0, "expected size %zd got %d",
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sizeof(ndata), i);
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for (i = 0; i < p.recv_socks; ++i)
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if (ev.data.fd == fd[i])
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break;
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memcpy(&ndata, recv_buf, sizeof(ndata));
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fprintf(stderr, "Socket %d: %d\n", i, ntohl(ndata));
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expected = (sport % mod);
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if (i != expected)
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error(1, 0, "expected socket %d", expected);
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}
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}
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static void test_reuseport_ebpf(const struct test_params p)
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{
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int i, fd[p.recv_socks];
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fprintf(stderr, "Testing EBPF mod %zd...\n", p.recv_socks);
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build_recv_group(p, fd, p.recv_socks, attach_ebpf);
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test_recv_order(p, fd, p.recv_socks);
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fprintf(stderr, "Reprograming, testing mod %zd...\n", p.recv_socks / 2);
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attach_ebpf(fd[0], p.recv_socks / 2);
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test_recv_order(p, fd, p.recv_socks / 2);
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for (i = 0; i < p.recv_socks; ++i)
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close(fd[i]);
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}
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static void test_reuseport_cbpf(const struct test_params p)
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{
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int i, fd[p.recv_socks];
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fprintf(stderr, "Testing CBPF mod %zd...\n", p.recv_socks);
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build_recv_group(p, fd, p.recv_socks, attach_cbpf);
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test_recv_order(p, fd, p.recv_socks);
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fprintf(stderr, "Reprograming, testing mod %zd...\n", p.recv_socks / 2);
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attach_cbpf(fd[0], p.recv_socks / 2);
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test_recv_order(p, fd, p.recv_socks / 2);
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for (i = 0; i < p.recv_socks; ++i)
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close(fd[i]);
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}
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static void test_extra_filter(const struct test_params p)
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{
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struct sockaddr * const addr =
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new_any_sockaddr(p.recv_family, p.recv_port);
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int fd1, fd2, opt;
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fprintf(stderr, "Testing too many filters...\n");
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fd1 = socket(p.recv_family, p.protocol, 0);
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if (fd1 < 0)
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error(1, errno, "failed to create socket 1");
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fd2 = socket(p.recv_family, p.protocol, 0);
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if (fd2 < 0)
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error(1, errno, "failed to create socket 2");
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opt = 1;
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if (setsockopt(fd1, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt)))
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error(1, errno, "failed to set SO_REUSEPORT on socket 1");
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if (setsockopt(fd2, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt)))
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error(1, errno, "failed to set SO_REUSEPORT on socket 2");
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attach_ebpf(fd1, 10);
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attach_ebpf(fd2, 10);
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if (bind(fd1, addr, sockaddr_size()))
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error(1, errno, "failed to bind recv socket 1");
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if (!bind(fd2, addr, sockaddr_size()) && errno != EADDRINUSE)
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error(1, errno, "bind socket 2 should fail with EADDRINUSE");
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free(addr);
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}
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static void test_filter_no_reuseport(const struct test_params p)
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{
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struct sockaddr * const addr =
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new_any_sockaddr(p.recv_family, p.recv_port);
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const char bpf_license[] = "GPL";
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struct bpf_insn ecode[] = {
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{ BPF_ALU64 | BPF_MOV | BPF_K, BPF_REG_0, 0, 0, 10 },
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{ BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
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};
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struct sock_filter ccode[] = {{ BPF_RET | BPF_A, 0, 0, 0 }};
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union bpf_attr eprog;
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struct sock_fprog cprog;
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int fd, bpf_fd;
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fprintf(stderr, "Testing filters on non-SO_REUSEPORT socket...\n");
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memset(&eprog, 0, sizeof(eprog));
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eprog.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
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eprog.insn_cnt = ARRAY_SIZE(ecode);
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eprog.insns = (uint64_t)ecode;
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eprog.license = (uint64_t)bpf_license;
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eprog.kern_version = 0;
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memset(&cprog, 0, sizeof(cprog));
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cprog.len = ARRAY_SIZE(ccode);
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cprog.filter = ccode;
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bpf_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &eprog, sizeof(eprog));
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if (bpf_fd < 0)
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error(1, errno, "ebpf error");
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fd = socket(p.recv_family, p.protocol, 0);
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if (fd < 0)
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error(1, errno, "failed to create socket 1");
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if (bind(fd, addr, sockaddr_size()))
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error(1, errno, "failed to bind recv socket 1");
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errno = 0;
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if (!setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &bpf_fd,
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sizeof(bpf_fd)) || errno != EINVAL)
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error(1, errno, "setsockopt should have returned EINVAL");
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errno = 0;
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if (!setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_CBPF, &cprog,
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sizeof(cprog)) || errno != EINVAL)
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error(1, errno, "setsockopt should have returned EINVAL");
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free(addr);
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}
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static void test_filter_without_bind(void)
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{
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int fd1, fd2;
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fprintf(stderr, "Testing filter add without bind...\n");
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fd1 = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd1 < 0)
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error(1, errno, "failed to create socket 1");
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fd2 = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd2 < 0)
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error(1, errno, "failed to create socket 2");
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attach_ebpf(fd1, 10);
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attach_cbpf(fd2, 10);
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close(fd1);
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close(fd2);
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}
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int main(void)
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{
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fprintf(stderr, "---- IPv4 UDP ----\n");
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test_reuseport_ebpf((struct test_params) {
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.recv_family = AF_INET,
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.send_family = AF_INET,
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.protocol = SOCK_DGRAM,
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.recv_socks = 10,
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.recv_port = 8000,
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.send_port_min = 9000});
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test_reuseport_cbpf((struct test_params) {
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.recv_family = AF_INET,
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.send_family = AF_INET,
|
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.protocol = SOCK_DGRAM,
|
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.recv_socks = 10,
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.recv_port = 8001,
|
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.send_port_min = 9020});
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test_extra_filter((struct test_params) {
|
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.recv_family = AF_INET,
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.protocol = SOCK_DGRAM,
|
||||
.recv_port = 8002});
|
||||
test_filter_no_reuseport((struct test_params) {
|
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.recv_family = AF_INET,
|
||||
.protocol = SOCK_DGRAM,
|
||||
.recv_port = 8008});
|
||||
|
||||
fprintf(stderr, "---- IPv6 UDP ----\n");
|
||||
test_reuseport_ebpf((struct test_params) {
|
||||
.recv_family = AF_INET6,
|
||||
.send_family = AF_INET6,
|
||||
.protocol = SOCK_DGRAM,
|
||||
.recv_socks = 10,
|
||||
.recv_port = 8003,
|
||||
.send_port_min = 9040});
|
||||
test_reuseport_cbpf((struct test_params) {
|
||||
.recv_family = AF_INET6,
|
||||
.send_family = AF_INET6,
|
||||
.protocol = SOCK_DGRAM,
|
||||
.recv_socks = 10,
|
||||
.recv_port = 8004,
|
||||
.send_port_min = 9060});
|
||||
test_extra_filter((struct test_params) {
|
||||
.recv_family = AF_INET6,
|
||||
.protocol = SOCK_DGRAM,
|
||||
.recv_port = 8005});
|
||||
test_filter_no_reuseport((struct test_params) {
|
||||
.recv_family = AF_INET6,
|
||||
.protocol = SOCK_DGRAM,
|
||||
.recv_port = 8009});
|
||||
|
||||
fprintf(stderr, "---- IPv6 UDP w/ mapped IPv4 ----\n");
|
||||
test_reuseport_ebpf((struct test_params) {
|
||||
.recv_family = AF_INET6,
|
||||
.send_family = AF_INET,
|
||||
.protocol = SOCK_DGRAM,
|
||||
.recv_socks = 10,
|
||||
.recv_port = 8006,
|
||||
.send_port_min = 9080});
|
||||
test_reuseport_cbpf((struct test_params) {
|
||||
.recv_family = AF_INET6,
|
||||
.send_family = AF_INET,
|
||||
.protocol = SOCK_DGRAM,
|
||||
.recv_socks = 10,
|
||||
.recv_port = 8007,
|
||||
.send_port_min = 9100});
|
||||
|
||||
|
||||
test_filter_without_bind();
|
||||
|
||||
fprintf(stderr, "SUCCESS\n");
|
||||
return 0;
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче