tools: bpftool: add net attach command to attach XDP on interface
By this commit, using `bpftool net attach`, user can attach XDP prog on interface. New type of enum 'net_attach_type' has been made, as stat ted at cover-letter, the meaning of 'attach' is, prog will be attached on interface. With 'overwrite' option at argument, attached XDP program could be replaced. Added new helper 'net_parse_dev' to parse the network device at argument. BPF prog will be attached through libbpf 'bpf_set_link_xdp_fd'. Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>alistair/sunxi64-5.4-dsi
Daniel T. Lee
Alexei Starovoitov
parent
a9436dca11
commit
04949ccc27
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@ -55,6 +55,35 @@ struct bpf_attach_info {
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__u32 flow_dissector_id;
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};
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enum net_attach_type {
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NET_ATTACH_TYPE_XDP,
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NET_ATTACH_TYPE_XDP_GENERIC,
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NET_ATTACH_TYPE_XDP_DRIVER,
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NET_ATTACH_TYPE_XDP_OFFLOAD,
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};
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static const char * const attach_type_strings[] = {
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[NET_ATTACH_TYPE_XDP] = "xdp",
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[NET_ATTACH_TYPE_XDP_GENERIC] = "xdpgeneric",
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[NET_ATTACH_TYPE_XDP_DRIVER] = "xdpdrv",
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[NET_ATTACH_TYPE_XDP_OFFLOAD] = "xdpoffload",
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};
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const size_t net_attach_type_size = ARRAY_SIZE(attach_type_strings);
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static enum net_attach_type parse_attach_type(const char *str)
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{
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enum net_attach_type type;
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for (type = 0; type < net_attach_type_size; type++) {
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if (attach_type_strings[type] &&
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is_prefix(str, attach_type_strings[type]))
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return type;
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}
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return net_attach_type_size;
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}
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static int dump_link_nlmsg(void *cookie, void *msg, struct nlattr **tb)
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{
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struct bpf_netdev_t *netinfo = cookie;
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@ -223,6 +252,97 @@ static int query_flow_dissector(struct bpf_attach_info *attach_info)
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return 0;
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}
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static int net_parse_dev(int *argc, char ***argv)
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{
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int ifindex;
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if (is_prefix(**argv, "dev")) {
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NEXT_ARGP();
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ifindex = if_nametoindex(**argv);
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if (!ifindex)
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p_err("invalid devname %s", **argv);
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NEXT_ARGP();
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} else {
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p_err("expected 'dev', got: '%s'?", **argv);
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return -1;
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}
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return ifindex;
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}
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static int do_attach_detach_xdp(int progfd, enum net_attach_type attach_type,
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int ifindex, bool overwrite)
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{
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__u32 flags = 0;
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if (!overwrite)
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flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
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if (attach_type == NET_ATTACH_TYPE_XDP_GENERIC)
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flags |= XDP_FLAGS_SKB_MODE;
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if (attach_type == NET_ATTACH_TYPE_XDP_DRIVER)
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flags |= XDP_FLAGS_DRV_MODE;
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if (attach_type == NET_ATTACH_TYPE_XDP_OFFLOAD)
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flags |= XDP_FLAGS_HW_MODE;
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return bpf_set_link_xdp_fd(ifindex, progfd, flags);
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}
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static int do_attach(int argc, char **argv)
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{
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enum net_attach_type attach_type;
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int progfd, ifindex, err = 0;
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bool overwrite = false;
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/* parse attach args */
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if (!REQ_ARGS(5))
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return -EINVAL;
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attach_type = parse_attach_type(*argv);
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if (attach_type == net_attach_type_size) {
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p_err("invalid net attach/detach type: %s", *argv);
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return -EINVAL;
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}
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NEXT_ARG();
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progfd = prog_parse_fd(&argc, &argv);
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if (progfd < 0)
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return -EINVAL;
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ifindex = net_parse_dev(&argc, &argv);
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if (ifindex < 1) {
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close(progfd);
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return -EINVAL;
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}
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if (argc) {
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if (is_prefix(*argv, "overwrite")) {
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overwrite = true;
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} else {
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p_err("expected 'overwrite', got: '%s'?", *argv);
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close(progfd);
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return -EINVAL;
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}
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}
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/* attach xdp prog */
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if (is_prefix("xdp", attach_type_strings[attach_type]))
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err = do_attach_detach_xdp(progfd, attach_type, ifindex,
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overwrite);
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if (err < 0) {
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p_err("interface %s attach failed: %s",
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attach_type_strings[attach_type], strerror(-err));
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return err;
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}
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if (json_output)
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jsonw_null(json_wtr);
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return 0;
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}
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static int do_show(int argc, char **argv)
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{
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struct bpf_attach_info attach_info = {};
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@ -232,13 +352,9 @@ static int do_show(int argc, char **argv)
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char err_buf[256];
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if (argc == 2) {
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if (strcmp(argv[0], "dev") != 0)
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usage();
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filter_idx = if_nametoindex(argv[1]);
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if (filter_idx == 0) {
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fprintf(stderr, "invalid dev name %s\n", argv[1]);
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filter_idx = net_parse_dev(&argc, &argv);
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if (filter_idx < 1)
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return -1;
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}
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} else if (argc != 0) {
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usage();
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}
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@ -305,13 +421,18 @@ static int do_help(int argc, char **argv)
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fprintf(stderr,
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"Usage: %s %s { show | list } [dev <devname>]\n"
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" %s %s attach ATTACH_TYPE PROG dev <devname> [ overwrite ]\n"
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" %s %s help\n"
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"\n"
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" " HELP_SPEC_PROGRAM "\n"
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" ATTACH_TYPE := { xdp | xdpgeneric | xdpdrv | xdpoffload }\n"
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"\n"
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"Note: Only xdp and tc attachments are supported now.\n"
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" For progs attached to cgroups, use \"bpftool cgroup\"\n"
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" to dump program attachments. For program types\n"
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" sk_{filter,skb,msg,reuseport} and lwt/seg6, please\n"
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" consult iproute2.\n",
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bin_name, argv[-2], bin_name, argv[-2]);
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bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2]);
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return 0;
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}
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@ -319,6 +440,7 @@ static int do_help(int argc, char **argv)
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static const struct cmd cmds[] = {
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{ "show", do_show },
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{ "list", do_show },
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{ "attach", do_attach },
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{ "help", do_help },
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{ 0 }
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};
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