selftests/bpf: test bpf flow dissection
Adds a test that sends different types of packets over multiple tunnels and verifies that valid packets are dissected correctly. To do so, a tc-flower rule is added to drop packets on UDP src port 9, and packets are sent from ports 8, 9, and 10. Only the packets on port 9 should be dropped. Because tc-flower relies on the flow dissector to match flows, correct classification demonstrates correct dissection. Also add support logic to load the BPF program and to inject the test packets. Signed-off-by: Petar Penkov <ppenkov@google.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>hifive-unleashed-5.1
Petar Penkov
Alexei Starovoitov
parent
9c98b13cc3
commit
50b3ed57de
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@ -23,3 +23,5 @@ test_skb_cgroup_id_user
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test_socket_cookie
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test_cgroup_storage
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test_select_reuseport
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test_flow_dissector
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flow_dissector_load
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@ -47,10 +47,12 @@ TEST_PROGS := test_kmod.sh \
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test_tunnel.sh \
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test_lwt_seg6local.sh \
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test_lirc_mode2.sh \
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test_skb_cgroup_id.sh
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test_skb_cgroup_id.sh \
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test_flow_dissector.sh
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# Compile but not part of 'make run_tests'
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TEST_GEN_PROGS_EXTENDED = test_libbpf_open test_sock_addr test_skb_cgroup_id_user
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TEST_GEN_PROGS_EXTENDED = test_libbpf_open test_sock_addr test_skb_cgroup_id_user \
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flow_dissector_load test_flow_dissector
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include ../lib.mk
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@ -18,3 +18,4 @@ CONFIG_CRYPTO_HMAC=m
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CONFIG_CRYPTO_SHA256=m
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CONFIG_VXLAN=y
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CONFIG_GENEVE=y
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CONFIG_NET_CLS_FLOWER=m
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@ -0,0 +1,140 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <error.h>
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#include <errno.h>
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#include <getopt.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/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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const char *cfg_pin_path = "/sys/fs/bpf/flow_dissector";
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const char *cfg_map_name = "jmp_table";
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bool cfg_attach = true;
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char *cfg_section_name;
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char *cfg_path_name;
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static void load_and_attach_program(void)
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{
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struct bpf_program *prog, *main_prog;
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struct bpf_map *prog_array;
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int i, fd, prog_fd, ret;
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struct bpf_object *obj;
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int prog_array_fd;
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ret = bpf_prog_load(cfg_path_name, BPF_PROG_TYPE_FLOW_DISSECTOR, &obj,
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&prog_fd);
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if (ret)
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error(1, 0, "bpf_prog_load %s", cfg_path_name);
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main_prog = bpf_object__find_program_by_title(obj, cfg_section_name);
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if (!main_prog)
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error(1, 0, "bpf_object__find_program_by_title %s",
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cfg_section_name);
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prog_fd = bpf_program__fd(main_prog);
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if (prog_fd < 0)
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error(1, 0, "bpf_program__fd");
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prog_array = bpf_object__find_map_by_name(obj, cfg_map_name);
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if (!prog_array)
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error(1, 0, "bpf_object__find_map_by_name %s", cfg_map_name);
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prog_array_fd = bpf_map__fd(prog_array);
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if (prog_array_fd < 0)
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error(1, 0, "bpf_map__fd %s", cfg_map_name);
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i = 0;
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bpf_object__for_each_program(prog, obj) {
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fd = bpf_program__fd(prog);
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if (fd < 0)
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error(1, 0, "bpf_program__fd");
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if (fd != prog_fd) {
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printf("%d: %s\n", i, bpf_program__title(prog, false));
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bpf_map_update_elem(prog_array_fd, &i, &fd, BPF_ANY);
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++i;
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}
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}
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ret = bpf_prog_attach(prog_fd, 0 /* Ignore */, BPF_FLOW_DISSECTOR, 0);
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if (ret)
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error(1, 0, "bpf_prog_attach %s", cfg_path_name);
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ret = bpf_object__pin(obj, cfg_pin_path);
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if (ret)
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error(1, 0, "bpf_object__pin %s", cfg_pin_path);
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}
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static void detach_program(void)
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{
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char command[64];
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int ret;
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ret = bpf_prog_detach(0, BPF_FLOW_DISSECTOR);
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if (ret)
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error(1, 0, "bpf_prog_detach");
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/* To unpin, it is necessary and sufficient to just remove this dir */
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sprintf(command, "rm -r %s", cfg_pin_path);
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ret = system(command);
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if (ret)
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error(1, errno, command);
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}
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static void parse_opts(int argc, char **argv)
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{
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bool attach = false;
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bool detach = false;
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int c;
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while ((c = getopt(argc, argv, "adp:s:")) != -1) {
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switch (c) {
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case 'a':
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if (detach)
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error(1, 0, "attach/detach are exclusive");
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attach = true;
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break;
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case 'd':
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if (attach)
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error(1, 0, "attach/detach are exclusive");
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detach = true;
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break;
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case 'p':
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if (cfg_path_name)
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error(1, 0, "only one prog name can be given");
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cfg_path_name = optarg;
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break;
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case 's':
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if (cfg_section_name)
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error(1, 0, "only one section can be given");
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cfg_section_name = optarg;
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break;
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}
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}
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if (detach)
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cfg_attach = false;
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if (cfg_attach && !cfg_path_name)
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error(1, 0, "must provide a path to the BPF program");
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if (cfg_attach && !cfg_section_name)
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error(1, 0, "must provide a section name");
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}
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int main(int argc, char **argv)
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{
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parse_opts(argc, argv);
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if (cfg_attach)
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load_and_attach_program();
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else
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detach_program();
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return 0;
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}
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@ -0,0 +1,782 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Inject packets with all sorts of encapsulation into the kernel.
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*
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* IPv4/IPv6 outer layer 3
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* GRE/GUE/BARE outer layer 4, where bare is IPIP/SIT/IPv4-in-IPv6/..
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* IPv4/IPv6 inner layer 3
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*/
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#define _GNU_SOURCE
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#include <stddef.h>
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#include <arpa/inet.h>
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#include <asm/byteorder.h>
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#include <error.h>
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#include <errno.h>
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#include <linux/if_packet.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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#include <linux/ipv6.h>
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#include <netinet/ip.h>
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#include <netinet/in.h>
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#include <netinet/udp.h>
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#include <poll.h>
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#include <stdbool.h>
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#include <stdlib.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/ioctl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#define CFG_PORT_INNER 8000
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/* Add some protocol definitions that do not exist in userspace */
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struct grehdr {
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uint16_t unused;
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uint16_t protocol;
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} __attribute__((packed));
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struct guehdr {
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union {
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struct {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 hlen:5,
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control:1,
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version:2;
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#elif defined (__BIG_ENDIAN_BITFIELD)
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__u8 version:2,
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control:1,
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hlen:5;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 proto_ctype;
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__be16 flags;
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};
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__be32 word;
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};
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};
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static uint8_t cfg_dsfield_inner;
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static uint8_t cfg_dsfield_outer;
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static uint8_t cfg_encap_proto;
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static bool cfg_expect_failure = false;
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static int cfg_l3_extra = AF_UNSPEC; /* optional SIT prefix */
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static int cfg_l3_inner = AF_UNSPEC;
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static int cfg_l3_outer = AF_UNSPEC;
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static int cfg_num_pkt = 10;
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static int cfg_num_secs = 0;
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static char cfg_payload_char = 'a';
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static int cfg_payload_len = 100;
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static int cfg_port_gue = 6080;
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static bool cfg_only_rx;
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static bool cfg_only_tx;
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static int cfg_src_port = 9;
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static char buf[ETH_DATA_LEN];
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#define INIT_ADDR4(name, addr4, port) \
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static struct sockaddr_in name = { \
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.sin_family = AF_INET, \
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.sin_port = __constant_htons(port), \
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.sin_addr.s_addr = __constant_htonl(addr4), \
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};
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#define INIT_ADDR6(name, addr6, port) \
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static struct sockaddr_in6 name = { \
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.sin6_family = AF_INET6, \
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.sin6_port = __constant_htons(port), \
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.sin6_addr = addr6, \
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};
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INIT_ADDR4(in_daddr4, INADDR_LOOPBACK, CFG_PORT_INNER)
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INIT_ADDR4(in_saddr4, INADDR_LOOPBACK + 2, 0)
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INIT_ADDR4(out_daddr4, INADDR_LOOPBACK, 0)
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INIT_ADDR4(out_saddr4, INADDR_LOOPBACK + 1, 0)
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INIT_ADDR4(extra_daddr4, INADDR_LOOPBACK, 0)
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INIT_ADDR4(extra_saddr4, INADDR_LOOPBACK + 1, 0)
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INIT_ADDR6(in_daddr6, IN6ADDR_LOOPBACK_INIT, CFG_PORT_INNER)
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INIT_ADDR6(in_saddr6, IN6ADDR_LOOPBACK_INIT, 0)
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INIT_ADDR6(out_daddr6, IN6ADDR_LOOPBACK_INIT, 0)
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INIT_ADDR6(out_saddr6, IN6ADDR_LOOPBACK_INIT, 0)
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INIT_ADDR6(extra_daddr6, IN6ADDR_LOOPBACK_INIT, 0)
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INIT_ADDR6(extra_saddr6, IN6ADDR_LOOPBACK_INIT, 0)
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static unsigned long util_gettime(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
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}
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static void util_printaddr(const char *msg, struct sockaddr *addr)
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{
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unsigned long off = 0;
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char nbuf[INET6_ADDRSTRLEN];
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switch (addr->sa_family) {
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case PF_INET:
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off = __builtin_offsetof(struct sockaddr_in, sin_addr);
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break;
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case PF_INET6:
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off = __builtin_offsetof(struct sockaddr_in6, sin6_addr);
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break;
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default:
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error(1, 0, "printaddr: unsupported family %u\n",
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addr->sa_family);
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}
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if (!inet_ntop(addr->sa_family, ((void *) addr) + off, nbuf,
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sizeof(nbuf)))
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error(1, errno, "inet_ntop");
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fprintf(stderr, "%s: %s\n", msg, nbuf);
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}
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static unsigned long add_csum_hword(const uint16_t *start, int num_u16)
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{
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unsigned long sum = 0;
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int i;
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for (i = 0; i < num_u16; i++)
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sum += start[i];
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return sum;
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}
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static uint16_t build_ip_csum(const uint16_t *start, int num_u16,
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unsigned long sum)
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{
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sum += add_csum_hword(start, num_u16);
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while (sum >> 16)
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sum = (sum & 0xffff) + (sum >> 16);
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return ~sum;
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}
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static void build_ipv4_header(void *header, uint8_t proto,
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uint32_t src, uint32_t dst,
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int payload_len, uint8_t tos)
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{
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struct iphdr *iph = header;
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iph->ihl = 5;
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iph->version = 4;
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iph->tos = tos;
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iph->ttl = 8;
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iph->tot_len = htons(sizeof(*iph) + payload_len);
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iph->id = htons(1337);
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iph->protocol = proto;
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iph->saddr = src;
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iph->daddr = dst;
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iph->check = build_ip_csum((void *) iph, iph->ihl << 1, 0);
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}
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static void ipv6_set_dsfield(struct ipv6hdr *ip6h, uint8_t dsfield)
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{
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uint16_t val, *ptr = (uint16_t *)ip6h;
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val = ntohs(*ptr);
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val &= 0xF00F;
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val |= ((uint16_t) dsfield) << 4;
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*ptr = htons(val);
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}
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static void build_ipv6_header(void *header, uint8_t proto,
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struct sockaddr_in6 *src,
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struct sockaddr_in6 *dst,
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int payload_len, uint8_t dsfield)
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{
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struct ipv6hdr *ip6h = header;
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ip6h->version = 6;
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ip6h->payload_len = htons(payload_len);
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ip6h->nexthdr = proto;
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ip6h->hop_limit = 8;
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ipv6_set_dsfield(ip6h, dsfield);
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memcpy(&ip6h->saddr, &src->sin6_addr, sizeof(ip6h->saddr));
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memcpy(&ip6h->daddr, &dst->sin6_addr, sizeof(ip6h->daddr));
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}
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static uint16_t build_udp_v4_csum(const struct iphdr *iph,
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const struct udphdr *udph,
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int num_words)
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{
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unsigned long pseudo_sum;
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int num_u16 = sizeof(iph->saddr); /* halfwords: twice byte len */
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pseudo_sum = add_csum_hword((void *) &iph->saddr, num_u16);
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pseudo_sum += htons(IPPROTO_UDP);
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pseudo_sum += udph->len;
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return build_ip_csum((void *) udph, num_words, pseudo_sum);
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}
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static uint16_t build_udp_v6_csum(const struct ipv6hdr *ip6h,
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const struct udphdr *udph,
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int num_words)
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{
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unsigned long pseudo_sum;
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int num_u16 = sizeof(ip6h->saddr); /* halfwords: twice byte len */
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pseudo_sum = add_csum_hword((void *) &ip6h->saddr, num_u16);
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pseudo_sum += htons(ip6h->nexthdr);
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pseudo_sum += ip6h->payload_len;
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return build_ip_csum((void *) udph, num_words, pseudo_sum);
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}
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static void build_udp_header(void *header, int payload_len,
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uint16_t dport, int family)
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{
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struct udphdr *udph = header;
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int len = sizeof(*udph) + payload_len;
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udph->source = htons(cfg_src_port);
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udph->dest = htons(dport);
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udph->len = htons(len);
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udph->check = 0;
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if (family == AF_INET)
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udph->check = build_udp_v4_csum(header - sizeof(struct iphdr),
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udph, len >> 1);
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else
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udph->check = build_udp_v6_csum(header - sizeof(struct ipv6hdr),
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udph, len >> 1);
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}
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static void build_gue_header(void *header, uint8_t proto)
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{
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struct guehdr *gueh = header;
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gueh->proto_ctype = proto;
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}
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static void build_gre_header(void *header, uint16_t proto)
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{
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struct grehdr *greh = header;
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greh->protocol = htons(proto);
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}
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static int l3_length(int family)
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{
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if (family == AF_INET)
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return sizeof(struct iphdr);
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else
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return sizeof(struct ipv6hdr);
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}
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static int build_packet(void)
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{
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int ol3_len = 0, ol4_len = 0, il3_len = 0, il4_len = 0;
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int el3_len = 0;
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if (cfg_l3_extra)
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el3_len = l3_length(cfg_l3_extra);
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/* calculate header offsets */
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if (cfg_encap_proto) {
|
||||
ol3_len = l3_length(cfg_l3_outer);
|
||||
|
||||
if (cfg_encap_proto == IPPROTO_GRE)
|
||||
ol4_len = sizeof(struct grehdr);
|
||||
else if (cfg_encap_proto == IPPROTO_UDP)
|
||||
ol4_len = sizeof(struct udphdr) + sizeof(struct guehdr);
|
||||
}
|
||||
|
||||
il3_len = l3_length(cfg_l3_inner);
|
||||
il4_len = sizeof(struct udphdr);
|
||||
|
||||
if (el3_len + ol3_len + ol4_len + il3_len + il4_len + cfg_payload_len >=
|
||||
sizeof(buf))
|
||||
error(1, 0, "packet too large\n");
|
||||
|
||||
/*
|
||||
* Fill packet from inside out, to calculate correct checksums.
|
||||
* But create ip before udp headers, as udp uses ip for pseudo-sum.
|
||||
*/
|
||||
memset(buf + el3_len + ol3_len + ol4_len + il3_len + il4_len,
|
||||
cfg_payload_char, cfg_payload_len);
|
||||
|
||||
/* add zero byte for udp csum padding */
|
||||
buf[el3_len + ol3_len + ol4_len + il3_len + il4_len + cfg_payload_len] = 0;
|
||||
|
||||
switch (cfg_l3_inner) {
|
||||
case PF_INET:
|
||||
build_ipv4_header(buf + el3_len + ol3_len + ol4_len,
|
||||
IPPROTO_UDP,
|
||||
in_saddr4.sin_addr.s_addr,
|
||||
in_daddr4.sin_addr.s_addr,
|
||||
il4_len + cfg_payload_len,
|
||||
cfg_dsfield_inner);
|
||||
break;
|
||||
case PF_INET6:
|
||||
build_ipv6_header(buf + el3_len + ol3_len + ol4_len,
|
||||
IPPROTO_UDP,
|
||||
&in_saddr6, &in_daddr6,
|
||||
il4_len + cfg_payload_len,
|
||||
cfg_dsfield_inner);
|
||||
break;
|
||||
}
|
||||
|
||||
build_udp_header(buf + el3_len + ol3_len + ol4_len + il3_len,
|
||||
cfg_payload_len, CFG_PORT_INNER, cfg_l3_inner);
|
||||
|
||||
if (!cfg_encap_proto)
|
||||
return il3_len + il4_len + cfg_payload_len;
|
||||
|
||||
switch (cfg_l3_outer) {
|
||||
case PF_INET:
|
||||
build_ipv4_header(buf + el3_len, cfg_encap_proto,
|
||||
out_saddr4.sin_addr.s_addr,
|
||||
out_daddr4.sin_addr.s_addr,
|
||||
ol4_len + il3_len + il4_len + cfg_payload_len,
|
||||
cfg_dsfield_outer);
|
||||
break;
|
||||
case PF_INET6:
|
||||
build_ipv6_header(buf + el3_len, cfg_encap_proto,
|
||||
&out_saddr6, &out_daddr6,
|
||||
ol4_len + il3_len + il4_len + cfg_payload_len,
|
||||
cfg_dsfield_outer);
|
||||
break;
|
||||
}
|
||||
|
||||
switch (cfg_encap_proto) {
|
||||
case IPPROTO_UDP:
|
||||
build_gue_header(buf + el3_len + ol3_len + ol4_len -
|
||||
sizeof(struct guehdr),
|
||||
cfg_l3_inner == PF_INET ? IPPROTO_IPIP
|
||||
: IPPROTO_IPV6);
|
||||
build_udp_header(buf + el3_len + ol3_len,
|
||||
sizeof(struct guehdr) + il3_len + il4_len +
|
||||
cfg_payload_len,
|
||||
cfg_port_gue, cfg_l3_outer);
|
||||
break;
|
||||
case IPPROTO_GRE:
|
||||
build_gre_header(buf + el3_len + ol3_len,
|
||||
cfg_l3_inner == PF_INET ? ETH_P_IP
|
||||
: ETH_P_IPV6);
|
||||
break;
|
||||
}
|
||||
|
||||
switch (cfg_l3_extra) {
|
||||
case PF_INET:
|
||||
build_ipv4_header(buf,
|
||||
cfg_l3_outer == PF_INET ? IPPROTO_IPIP
|
||||
: IPPROTO_IPV6,
|
||||
extra_saddr4.sin_addr.s_addr,
|
||||
extra_daddr4.sin_addr.s_addr,
|
||||
ol3_len + ol4_len + il3_len + il4_len +
|
||||
cfg_payload_len, 0);
|
||||
break;
|
||||
case PF_INET6:
|
||||
build_ipv6_header(buf,
|
||||
cfg_l3_outer == PF_INET ? IPPROTO_IPIP
|
||||
: IPPROTO_IPV6,
|
||||
&extra_saddr6, &extra_daddr6,
|
||||
ol3_len + ol4_len + il3_len + il4_len +
|
||||
cfg_payload_len, 0);
|
||||
break;
|
||||
}
|
||||
|
||||
return el3_len + ol3_len + ol4_len + il3_len + il4_len +
|
||||
cfg_payload_len;
|
||||
}
|
||||
|
||||
/* sender transmits encapsulated over RAW or unencap'd over UDP */
|
||||
static int setup_tx(void)
|
||||
{
|
||||
int family, fd, ret;
|
||||
|
||||
if (cfg_l3_extra)
|
||||
family = cfg_l3_extra;
|
||||
else if (cfg_l3_outer)
|
||||
family = cfg_l3_outer;
|
||||
else
|
||||
family = cfg_l3_inner;
|
||||
|
||||
fd = socket(family, SOCK_RAW, IPPROTO_RAW);
|
||||
if (fd == -1)
|
||||
error(1, errno, "socket tx");
|
||||
|
||||
if (cfg_l3_extra) {
|
||||
if (cfg_l3_extra == PF_INET)
|
||||
ret = connect(fd, (void *) &extra_daddr4,
|
||||
sizeof(extra_daddr4));
|
||||
else
|
||||
ret = connect(fd, (void *) &extra_daddr6,
|
||||
sizeof(extra_daddr6));
|
||||
if (ret)
|
||||
error(1, errno, "connect tx");
|
||||
} else if (cfg_l3_outer) {
|
||||
/* connect to destination if not encapsulated */
|
||||
if (cfg_l3_outer == PF_INET)
|
||||
ret = connect(fd, (void *) &out_daddr4,
|
||||
sizeof(out_daddr4));
|
||||
else
|
||||
ret = connect(fd, (void *) &out_daddr6,
|
||||
sizeof(out_daddr6));
|
||||
if (ret)
|
||||
error(1, errno, "connect tx");
|
||||
} else {
|
||||
/* otherwise using loopback */
|
||||
if (cfg_l3_inner == PF_INET)
|
||||
ret = connect(fd, (void *) &in_daddr4,
|
||||
sizeof(in_daddr4));
|
||||
else
|
||||
ret = connect(fd, (void *) &in_daddr6,
|
||||
sizeof(in_daddr6));
|
||||
if (ret)
|
||||
error(1, errno, "connect tx");
|
||||
}
|
||||
|
||||
return fd;
|
||||
}
|
||||
|
||||
/* receiver reads unencapsulated UDP */
|
||||
static int setup_rx(void)
|
||||
{
|
||||
int fd, ret;
|
||||
|
||||
fd = socket(cfg_l3_inner, SOCK_DGRAM, 0);
|
||||
if (fd == -1)
|
||||
error(1, errno, "socket rx");
|
||||
|
||||
if (cfg_l3_inner == PF_INET)
|
||||
ret = bind(fd, (void *) &in_daddr4, sizeof(in_daddr4));
|
||||
else
|
||||
ret = bind(fd, (void *) &in_daddr6, sizeof(in_daddr6));
|
||||
if (ret)
|
||||
error(1, errno, "bind rx");
|
||||
|
||||
return fd;
|
||||
}
|
||||
|
||||
static int do_tx(int fd, const char *pkt, int len)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = write(fd, pkt, len);
|
||||
if (ret == -1)
|
||||
error(1, errno, "send");
|
||||
if (ret != len)
|
||||
error(1, errno, "send: len (%d < %d)\n", ret, len);
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int do_poll(int fd, short events, int timeout)
|
||||
{
|
||||
struct pollfd pfd;
|
||||
int ret;
|
||||
|
||||
pfd.fd = fd;
|
||||
pfd.events = events;
|
||||
|
||||
ret = poll(&pfd, 1, timeout);
|
||||
if (ret == -1)
|
||||
error(1, errno, "poll");
|
||||
if (ret && !(pfd.revents & POLLIN))
|
||||
error(1, errno, "poll: unexpected event 0x%x\n", pfd.revents);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int do_rx(int fd)
|
||||
{
|
||||
char rbuf;
|
||||
int ret, num = 0;
|
||||
|
||||
while (1) {
|
||||
ret = recv(fd, &rbuf, 1, MSG_DONTWAIT);
|
||||
if (ret == -1 && errno == EAGAIN)
|
||||
break;
|
||||
if (ret == -1)
|
||||
error(1, errno, "recv");
|
||||
if (rbuf != cfg_payload_char)
|
||||
error(1, 0, "recv: payload mismatch");
|
||||
num++;
|
||||
};
|
||||
|
||||
return num;
|
||||
}
|
||||
|
||||
static int do_main(void)
|
||||
{
|
||||
unsigned long tstop, treport, tcur;
|
||||
int fdt = -1, fdr = -1, len, tx = 0, rx = 0;
|
||||
|
||||
if (!cfg_only_tx)
|
||||
fdr = setup_rx();
|
||||
if (!cfg_only_rx)
|
||||
fdt = setup_tx();
|
||||
|
||||
len = build_packet();
|
||||
|
||||
tcur = util_gettime();
|
||||
treport = tcur + 1000;
|
||||
tstop = tcur + (cfg_num_secs * 1000);
|
||||
|
||||
while (1) {
|
||||
if (!cfg_only_rx)
|
||||
tx += do_tx(fdt, buf, len);
|
||||
|
||||
if (!cfg_only_tx)
|
||||
rx += do_rx(fdr);
|
||||
|
||||
if (cfg_num_secs) {
|
||||
tcur = util_gettime();
|
||||
if (tcur >= tstop)
|
||||
break;
|
||||
if (tcur >= treport) {
|
||||
fprintf(stderr, "pkts: tx=%u rx=%u\n", tx, rx);
|
||||
tx = 0;
|
||||
rx = 0;
|
||||
treport = tcur + 1000;
|
||||
}
|
||||
} else {
|
||||
if (tx == cfg_num_pkt)
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* read straggler packets, if any */
|
||||
if (rx < tx) {
|
||||
tstop = util_gettime() + 100;
|
||||
while (rx < tx) {
|
||||
tcur = util_gettime();
|
||||
if (tcur >= tstop)
|
||||
break;
|
||||
|
||||
do_poll(fdr, POLLIN, tstop - tcur);
|
||||
rx += do_rx(fdr);
|
||||
}
|
||||
}
|
||||
|
||||
fprintf(stderr, "pkts: tx=%u rx=%u\n", tx, rx);
|
||||
|
||||
if (fdr != -1 && close(fdr))
|
||||
error(1, errno, "close rx");
|
||||
if (fdt != -1 && close(fdt))
|
||||
error(1, errno, "close tx");
|
||||
|
||||
/*
|
||||
* success (== 0) only if received all packets
|
||||
* unless failure is expected, in which case none must arrive.
|
||||
*/
|
||||
if (cfg_expect_failure)
|
||||
return rx != 0;
|
||||
else
|
||||
return rx != tx;
|
||||
}
|
||||
|
||||
|
||||
static void __attribute__((noreturn)) usage(const char *filepath)
|
||||
{
|
||||
fprintf(stderr, "Usage: %s [-e gre|gue|bare|none] [-i 4|6] [-l len] "
|
||||
"[-O 4|6] [-o 4|6] [-n num] [-t secs] [-R] [-T] "
|
||||
"[-s <osrc> [-d <odst>] [-S <isrc>] [-D <idst>] "
|
||||
"[-x <otos>] [-X <itos>] [-f <isport>] [-F]\n",
|
||||
filepath);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
static void parse_addr(int family, void *addr, const char *optarg)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = inet_pton(family, optarg, addr);
|
||||
if (ret == -1)
|
||||
error(1, errno, "inet_pton");
|
||||
if (ret == 0)
|
||||
error(1, 0, "inet_pton: bad string");
|
||||
}
|
||||
|
||||
static void parse_addr4(struct sockaddr_in *addr, const char *optarg)
|
||||
{
|
||||
parse_addr(AF_INET, &addr->sin_addr, optarg);
|
||||
}
|
||||
|
||||
static void parse_addr6(struct sockaddr_in6 *addr, const char *optarg)
|
||||
{
|
||||
parse_addr(AF_INET6, &addr->sin6_addr, optarg);
|
||||
}
|
||||
|
||||
static int parse_protocol_family(const char *filepath, const char *optarg)
|
||||
{
|
||||
if (!strcmp(optarg, "4"))
|
||||
return PF_INET;
|
||||
if (!strcmp(optarg, "6"))
|
||||
return PF_INET6;
|
||||
|
||||
usage(filepath);
|
||||
}
|
||||
|
||||
static void parse_opts(int argc, char **argv)
|
||||
{
|
||||
int c;
|
||||
|
||||
while ((c = getopt(argc, argv, "d:D:e:f:Fhi:l:n:o:O:Rs:S:t:Tx:X:")) != -1) {
|
||||
switch (c) {
|
||||
case 'd':
|
||||
if (cfg_l3_outer == AF_UNSPEC)
|
||||
error(1, 0, "-d must be preceded by -o");
|
||||
if (cfg_l3_outer == AF_INET)
|
||||
parse_addr4(&out_daddr4, optarg);
|
||||
else
|
||||
parse_addr6(&out_daddr6, optarg);
|
||||
break;
|
||||
case 'D':
|
||||
if (cfg_l3_inner == AF_UNSPEC)
|
||||
error(1, 0, "-D must be preceded by -i");
|
||||
if (cfg_l3_inner == AF_INET)
|
||||
parse_addr4(&in_daddr4, optarg);
|
||||
else
|
||||
parse_addr6(&in_daddr6, optarg);
|
||||
break;
|
||||
case 'e':
|
||||
if (!strcmp(optarg, "gre"))
|
||||
cfg_encap_proto = IPPROTO_GRE;
|
||||
else if (!strcmp(optarg, "gue"))
|
||||
cfg_encap_proto = IPPROTO_UDP;
|
||||
else if (!strcmp(optarg, "bare"))
|
||||
cfg_encap_proto = IPPROTO_IPIP;
|
||||
else if (!strcmp(optarg, "none"))
|
||||
cfg_encap_proto = IPPROTO_IP; /* == 0 */
|
||||
else
|
||||
usage(argv[0]);
|
||||
break;
|
||||
case 'f':
|
||||
cfg_src_port = strtol(optarg, NULL, 0);
|
||||
break;
|
||||
case 'F':
|
||||
cfg_expect_failure = true;
|
||||
break;
|
||||
case 'h':
|
||||
usage(argv[0]);
|
||||
break;
|
||||
case 'i':
|
||||
if (!strcmp(optarg, "4"))
|
||||
cfg_l3_inner = PF_INET;
|
||||
else if (!strcmp(optarg, "6"))
|
||||
cfg_l3_inner = PF_INET6;
|
||||
else
|
||||
usage(argv[0]);
|
||||
break;
|
||||
case 'l':
|
||||
cfg_payload_len = strtol(optarg, NULL, 0);
|
||||
break;
|
||||
case 'n':
|
||||
cfg_num_pkt = strtol(optarg, NULL, 0);
|
||||
break;
|
||||
case 'o':
|
||||
cfg_l3_outer = parse_protocol_family(argv[0], optarg);
|
||||
break;
|
||||
case 'O':
|
||||
cfg_l3_extra = parse_protocol_family(argv[0], optarg);
|
||||
break;
|
||||
case 'R':
|
||||
cfg_only_rx = true;
|
||||
break;
|
||||
case 's':
|
||||
if (cfg_l3_outer == AF_INET)
|
||||
parse_addr4(&out_saddr4, optarg);
|
||||
else
|
||||
parse_addr6(&out_saddr6, optarg);
|
||||
break;
|
||||
case 'S':
|
||||
if (cfg_l3_inner == AF_INET)
|
||||
parse_addr4(&in_saddr4, optarg);
|
||||
else
|
||||
parse_addr6(&in_saddr6, optarg);
|
||||
break;
|
||||
case 't':
|
||||
cfg_num_secs = strtol(optarg, NULL, 0);
|
||||
break;
|
||||
case 'T':
|
||||
cfg_only_tx = true;
|
||||
break;
|
||||
case 'x':
|
||||
cfg_dsfield_outer = strtol(optarg, NULL, 0);
|
||||
break;
|
||||
case 'X':
|
||||
cfg_dsfield_inner = strtol(optarg, NULL, 0);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (cfg_only_rx && cfg_only_tx)
|
||||
error(1, 0, "options: cannot combine rx-only and tx-only");
|
||||
|
||||
if (cfg_encap_proto && cfg_l3_outer == AF_UNSPEC)
|
||||
error(1, 0, "options: must specify outer with encap");
|
||||
else if ((!cfg_encap_proto) && cfg_l3_outer != AF_UNSPEC)
|
||||
error(1, 0, "options: cannot combine no-encap and outer");
|
||||
else if ((!cfg_encap_proto) && cfg_l3_extra != AF_UNSPEC)
|
||||
error(1, 0, "options: cannot combine no-encap and extra");
|
||||
|
||||
if (cfg_l3_inner == AF_UNSPEC)
|
||||
cfg_l3_inner = AF_INET6;
|
||||
if (cfg_l3_inner == AF_INET6 && cfg_encap_proto == IPPROTO_IPIP)
|
||||
cfg_encap_proto = IPPROTO_IPV6;
|
||||
|
||||
/* RFC 6040 4.2:
|
||||
* on decap, if outer encountered congestion (CE == 0x3),
|
||||
* but inner cannot encode ECN (NoECT == 0x0), then drop packet.
|
||||
*/
|
||||
if (((cfg_dsfield_outer & 0x3) == 0x3) &&
|
||||
((cfg_dsfield_inner & 0x3) == 0x0))
|
||||
cfg_expect_failure = true;
|
||||
}
|
||||
|
||||
static void print_opts(void)
|
||||
{
|
||||
if (cfg_l3_inner == PF_INET6) {
|
||||
util_printaddr("inner.dest6", (void *) &in_daddr6);
|
||||
util_printaddr("inner.source6", (void *) &in_saddr6);
|
||||
} else {
|
||||
util_printaddr("inner.dest4", (void *) &in_daddr4);
|
||||
util_printaddr("inner.source4", (void *) &in_saddr4);
|
||||
}
|
||||
|
||||
if (!cfg_l3_outer)
|
||||
return;
|
||||
|
||||
fprintf(stderr, "encap proto: %u\n", cfg_encap_proto);
|
||||
|
||||
if (cfg_l3_outer == PF_INET6) {
|
||||
util_printaddr("outer.dest6", (void *) &out_daddr6);
|
||||
util_printaddr("outer.source6", (void *) &out_saddr6);
|
||||
} else {
|
||||
util_printaddr("outer.dest4", (void *) &out_daddr4);
|
||||
util_printaddr("outer.source4", (void *) &out_saddr4);
|
||||
}
|
||||
|
||||
if (!cfg_l3_extra)
|
||||
return;
|
||||
|
||||
if (cfg_l3_outer == PF_INET6) {
|
||||
util_printaddr("extra.dest6", (void *) &extra_daddr6);
|
||||
util_printaddr("extra.source6", (void *) &extra_saddr6);
|
||||
} else {
|
||||
util_printaddr("extra.dest4", (void *) &extra_daddr4);
|
||||
util_printaddr("extra.source4", (void *) &extra_saddr4);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
parse_opts(argc, argv);
|
||||
print_opts();
|
||||
return do_main();
|
||||
}
|
||||
|
|
@ -0,0 +1,115 @@
|
|||
#!/bin/bash
|
||||
# SPDX-License-Identifier: GPL-2.0
|
||||
#
|
||||
# Load BPF flow dissector and verify it correctly dissects traffic
|
||||
export TESTNAME=test_flow_dissector
|
||||
unmount=0
|
||||
|
||||
# Kselftest framework requirement - SKIP code is 4.
|
||||
ksft_skip=4
|
||||
|
||||
msg="skip all tests:"
|
||||
if [ $UID != 0 ]; then
|
||||
echo $msg please run this as root >&2
|
||||
exit $ksft_skip
|
||||
fi
|
||||
|
||||
# This test needs to be run in a network namespace with in_netns.sh. Check if
|
||||
# this is the case and run it with in_netns.sh if it is being run in the root
|
||||
# namespace.
|
||||
if [[ -z $(ip netns identify $$) ]]; then
|
||||
../net/in_netns.sh "$0" "$@"
|
||||
exit $?
|
||||
fi
|
||||
|
||||
# Determine selftest success via shell exit code
|
||||
exit_handler()
|
||||
{
|
||||
if (( $? == 0 )); then
|
||||
echo "selftests: $TESTNAME [PASS]";
|
||||
else
|
||||
echo "selftests: $TESTNAME [FAILED]";
|
||||
fi
|
||||
|
||||
set +e
|
||||
|
||||
# Cleanup
|
||||
tc filter del dev lo ingress pref 1337 2> /dev/null
|
||||
tc qdisc del dev lo ingress 2> /dev/null
|
||||
./flow_dissector_load -d 2> /dev/null
|
||||
if [ $unmount -ne 0 ]; then
|
||||
umount bpffs 2> /dev/null
|
||||
fi
|
||||
}
|
||||
|
||||
# Exit script immediately (well catched by trap handler) if any
|
||||
# program/thing exits with a non-zero status.
|
||||
set -e
|
||||
|
||||
# (Use 'trap -l' to list meaning of numbers)
|
||||
trap exit_handler 0 2 3 6 9
|
||||
|
||||
# Mount BPF file system
|
||||
if /bin/mount | grep /sys/fs/bpf > /dev/null; then
|
||||
echo "bpffs already mounted"
|
||||
else
|
||||
echo "bpffs not mounted. Mounting..."
|
||||
unmount=1
|
||||
/bin/mount bpffs /sys/fs/bpf -t bpf
|
||||
fi
|
||||
|
||||
# Attach BPF program
|
||||
./flow_dissector_load -p bpf_flow.o -s dissect
|
||||
|
||||
# Setup
|
||||
tc qdisc add dev lo ingress
|
||||
|
||||
echo "Testing IPv4..."
|
||||
# Drops all IP/UDP packets coming from port 9
|
||||
tc filter add dev lo parent ffff: protocol ip pref 1337 flower ip_proto \
|
||||
udp src_port 9 action drop
|
||||
|
||||
# Send 10 IPv4/UDP packets from port 8. Filter should not drop any.
|
||||
./test_flow_dissector -i 4 -f 8
|
||||
# Send 10 IPv4/UDP packets from port 9. Filter should drop all.
|
||||
./test_flow_dissector -i 4 -f 9 -F
|
||||
# Send 10 IPv4/UDP packets from port 10. Filter should not drop any.
|
||||
./test_flow_dissector -i 4 -f 10
|
||||
|
||||
echo "Testing IPIP..."
|
||||
# Send 10 IPv4/IPv4/UDP packets from port 8. Filter should not drop any.
|
||||
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
|
||||
-D 192.168.0.1 -S 1.1.1.1 -f 8
|
||||
# Send 10 IPv4/IPv4/UDP packets from port 9. Filter should drop all.
|
||||
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
|
||||
-D 192.168.0.1 -S 1.1.1.1 -f 9 -F
|
||||
# Send 10 IPv4/IPv4/UDP packets from port 10. Filter should not drop any.
|
||||
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
|
||||
-D 192.168.0.1 -S 1.1.1.1 -f 10
|
||||
|
||||
echo "Testing IPv4 + GRE..."
|
||||
# Send 10 IPv4/GRE/IPv4/UDP packets from port 8. Filter should not drop any.
|
||||
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
|
||||
-D 192.168.0.1 -S 1.1.1.1 -f 8
|
||||
# Send 10 IPv4/GRE/IPv4/UDP packets from port 9. Filter should drop all.
|
||||
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
|
||||
-D 192.168.0.1 -S 1.1.1.1 -f 9 -F
|
||||
# Send 10 IPv4/GRE/IPv4/UDP packets from port 10. Filter should not drop any.
|
||||
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
|
||||
-D 192.168.0.1 -S 1.1.1.1 -f 10
|
||||
|
||||
tc filter del dev lo ingress pref 1337
|
||||
|
||||
echo "Testing IPv6..."
|
||||
# Drops all IPv6/UDP packets coming from port 9
|
||||
tc filter add dev lo parent ffff: protocol ipv6 pref 1337 flower ip_proto \
|
||||
udp src_port 9 action drop
|
||||
|
||||
# Send 10 IPv6/UDP packets from port 8. Filter should not drop any.
|
||||
./test_flow_dissector -i 6 -f 8
|
||||
# Send 10 IPv6/UDP packets from port 9. Filter should drop all.
|
||||
./test_flow_dissector -i 6 -f 9 -F
|
||||
# Send 10 IPv6/UDP packets from port 10. Filter should not drop any.
|
||||
./test_flow_dissector -i 6 -f 10
|
||||
|
||||
exit 0
|
||||
|
|
@ -0,0 +1,54 @@
|
|||
#!/bin/bash
|
||||
# SPDX-License-Identifier: GPL-2.0
|
||||
#
|
||||
# add private ipv4 and ipv6 addresses to loopback
|
||||
|
||||
readonly V6_INNER='100::a/128'
|
||||
readonly V4_INNER='192.168.0.1/32'
|
||||
|
||||
if getopts ":s" opt; then
|
||||
readonly SIT_DEV_NAME='sixtofourtest0'
|
||||
readonly V6_SIT='2::/64'
|
||||
readonly V4_SIT='172.17.0.1/32'
|
||||
shift
|
||||
fi
|
||||
|
||||
fail() {
|
||||
echo "error: $*" 1>&2
|
||||
exit 1
|
||||
}
|
||||
|
||||
setup() {
|
||||
ip -6 addr add "${V6_INNER}" dev lo || fail 'failed to setup v6 address'
|
||||
ip -4 addr add "${V4_INNER}" dev lo || fail 'failed to setup v4 address'
|
||||
|
||||
if [[ -n "${V6_SIT}" ]]; then
|
||||
ip link add "${SIT_DEV_NAME}" type sit remote any local any \
|
||||
|| fail 'failed to add sit'
|
||||
ip link set dev "${SIT_DEV_NAME}" up \
|
||||
|| fail 'failed to bring sit device up'
|
||||
ip -6 addr add "${V6_SIT}" dev "${SIT_DEV_NAME}" \
|
||||
|| fail 'failed to setup v6 SIT address'
|
||||
ip -4 addr add "${V4_SIT}" dev "${SIT_DEV_NAME}" \
|
||||
|| fail 'failed to setup v4 SIT address'
|
||||
fi
|
||||
|
||||
sleep 2 # avoid race causing bind to fail
|
||||
}
|
||||
|
||||
cleanup() {
|
||||
if [[ -n "${V6_SIT}" ]]; then
|
||||
ip -4 addr del "${V4_SIT}" dev "${SIT_DEV_NAME}"
|
||||
ip -6 addr del "${V6_SIT}" dev "${SIT_DEV_NAME}"
|
||||
ip link del "${SIT_DEV_NAME}"
|
||||
fi
|
||||
|
||||
ip -4 addr del "${V4_INNER}" dev lo
|
||||
ip -6 addr del "${V6_INNER}" dev lo
|
||||
}
|
||||
|
||||
trap cleanup EXIT
|
||||
|
||||
setup
|
||||
"$@"
|
||||
exit "$?"
|
||||
|
|
@ -0,0 +1,36 @@
|
|||
#!/bin/bash
|
||||
# SPDX-License-Identifier: GPL-2.0
|
||||
#
|
||||
# setup tunnels for flow dissection test
|
||||
|
||||
readonly SUFFIX="test_$(mktemp -u XXXX)"
|
||||
CONFIG="remote 127.0.0.2 local 127.0.0.1 dev lo"
|
||||
|
||||
setup() {
|
||||
ip link add "ipip_${SUFFIX}" type ipip ${CONFIG}
|
||||
ip link add "gre_${SUFFIX}" type gre ${CONFIG}
|
||||
ip link add "sit_${SUFFIX}" type sit ${CONFIG}
|
||||
|
||||
echo "tunnels before test:"
|
||||
ip tunnel show
|
||||
|
||||
ip link set "ipip_${SUFFIX}" up
|
||||
ip link set "gre_${SUFFIX}" up
|
||||
ip link set "sit_${SUFFIX}" up
|
||||
}
|
||||
|
||||
|
||||
cleanup() {
|
||||
ip tunnel del "ipip_${SUFFIX}"
|
||||
ip tunnel del "gre_${SUFFIX}"
|
||||
ip tunnel del "sit_${SUFFIX}"
|
||||
|
||||
echo "tunnels after test:"
|
||||
ip tunnel show
|
||||
}
|
||||
|
||||
trap cleanup EXIT
|
||||
|
||||
setup
|
||||
"$@"
|
||||
exit "$?"
|
||||
Loading…
Reference in New Issue