diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/flow_dissector.c')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/flow_dissector.c | 113 |
1 files changed, 103 insertions, 10 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/flow_dissector.c b/tools/testing/selftests/bpf/prog_tests/flow_dissector.c index 126319f9a97c..8b54adfd6264 100644 --- a/tools/testing/selftests/bpf/prog_tests/flow_dissector.c +++ b/tools/testing/selftests/bpf/prog_tests/flow_dissector.c @@ -1,5 +1,8 @@ // SPDX-License-Identifier: GPL-2.0 #include <test_progs.h> +#include <error.h> +#include <linux/if.h> +#include <linux/if_tun.h> #define CHECK_FLOW_KEYS(desc, got, expected) \ CHECK_ATTR(memcmp(&got, &expected, sizeof(got)) != 0, \ @@ -79,8 +82,8 @@ struct test tests[] = { .tcp.doff = 5, }, .keys = { - .nhoff = 0, - .thoff = sizeof(struct iphdr), + .nhoff = ETH_HLEN, + .thoff = ETH_HLEN + sizeof(struct iphdr), .addr_proto = ETH_P_IP, .ip_proto = IPPROTO_TCP, .n_proto = __bpf_constant_htons(ETH_P_IP), @@ -95,8 +98,8 @@ struct test tests[] = { .tcp.doff = 5, }, .keys = { - .nhoff = 0, - .thoff = sizeof(struct ipv6hdr), + .nhoff = ETH_HLEN, + .thoff = ETH_HLEN + sizeof(struct ipv6hdr), .addr_proto = ETH_P_IPV6, .ip_proto = IPPROTO_TCP, .n_proto = __bpf_constant_htons(ETH_P_IPV6), @@ -113,8 +116,8 @@ struct test tests[] = { .tcp.doff = 5, }, .keys = { - .nhoff = VLAN_HLEN, - .thoff = VLAN_HLEN + sizeof(struct iphdr), + .nhoff = ETH_HLEN + VLAN_HLEN, + .thoff = ETH_HLEN + VLAN_HLEN + sizeof(struct iphdr), .addr_proto = ETH_P_IP, .ip_proto = IPPROTO_TCP, .n_proto = __bpf_constant_htons(ETH_P_IP), @@ -131,8 +134,9 @@ struct test tests[] = { .tcp.doff = 5, }, .keys = { - .nhoff = VLAN_HLEN * 2, - .thoff = VLAN_HLEN * 2 + sizeof(struct ipv6hdr), + .nhoff = ETH_HLEN + VLAN_HLEN * 2, + .thoff = ETH_HLEN + VLAN_HLEN * 2 + + sizeof(struct ipv6hdr), .addr_proto = ETH_P_IPV6, .ip_proto = IPPROTO_TCP, .n_proto = __bpf_constant_htons(ETH_P_IPV6), @@ -140,13 +144,73 @@ struct test tests[] = { }, }; +static int create_tap(const char *ifname) +{ + struct ifreq ifr = { + .ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS, + }; + int fd, ret; + + strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); + + fd = open("/dev/net/tun", O_RDWR); + if (fd < 0) + return -1; + + ret = ioctl(fd, TUNSETIFF, &ifr); + if (ret) + return -1; + + return fd; +} + +static int tx_tap(int fd, void *pkt, size_t len) +{ + struct iovec iov[] = { + { + .iov_len = len, + .iov_base = pkt, + }, + }; + return writev(fd, iov, ARRAY_SIZE(iov)); +} + +static int ifup(const char *ifname) +{ + struct ifreq ifr = {}; + int sk, ret; + + strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); + + sk = socket(PF_INET, SOCK_DGRAM, 0); + if (sk < 0) + return -1; + + ret = ioctl(sk, SIOCGIFFLAGS, &ifr); + if (ret) { + close(sk); + return -1; + } + + ifr.ifr_flags |= IFF_UP; + ret = ioctl(sk, SIOCSIFFLAGS, &ifr); + if (ret) { + close(sk); + return -1; + } + + close(sk); + return 0; +} + void test_flow_dissector(void) { + int i, err, prog_fd, keys_fd = -1, tap_fd; struct bpf_object *obj; - int i, err, prog_fd; + __u32 duration = 0; err = bpf_flow_load(&obj, "./bpf_flow.o", "flow_dissector", - "jmp_table", &prog_fd); + "jmp_table", "last_dissection", &prog_fd, &keys_fd); if (err) { error_cnt++; return; @@ -171,5 +235,34 @@ void test_flow_dissector(void) CHECK_FLOW_KEYS(tests[i].name, flow_keys, tests[i].keys); } + /* Do the same tests but for skb-less flow dissector. + * We use a known path in the net/tun driver that calls + * eth_get_headlen and we manually export bpf_flow_keys + * via BPF map in this case. + */ + + err = bpf_prog_attach(prog_fd, 0, BPF_FLOW_DISSECTOR, 0); + CHECK(err, "bpf_prog_attach", "err %d errno %d", err, errno); + + tap_fd = create_tap("tap0"); + CHECK(tap_fd < 0, "create_tap", "tap_fd %d errno %d", tap_fd, errno); + err = ifup("tap0"); + CHECK(err, "ifup", "err %d errno %d", err, errno); + + for (i = 0; i < ARRAY_SIZE(tests); i++) { + struct bpf_flow_keys flow_keys = {}; + struct bpf_prog_test_run_attr tattr = {}; + __u32 key = 0; + + err = tx_tap(tap_fd, &tests[i].pkt, sizeof(tests[i].pkt)); + CHECK(err < 0, "tx_tap", "err %d errno %d", err, errno); + + err = bpf_map_lookup_elem(keys_fd, &key, &flow_keys); + CHECK_ATTR(err, tests[i].name, "bpf_map_lookup_elem %d\n", err); + + CHECK_ATTR(err, tests[i].name, "skb-less err %d\n", err); + CHECK_FLOW_KEYS(tests[i].name, flow_keys, tests[i].keys); + } + bpf_object__close(obj); } |