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/*
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* f_bpf.c BPF-based Classifier
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*
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* This program is free software; you can distribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Daniel Borkmann <daniel@iogearbox.net>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <linux/bpf.h>
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#include "utils.h"
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#include "tc_util.h"
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#include "bpf_util.h"
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static const enum bpf_prog_type bpf_type = BPF_PROG_TYPE_SCHED_CLS;
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static void explain(void)
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{
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fprintf(stderr,
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"Usage: ... bpf ...\n"
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"\n"
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"BPF use case:\n"
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" bytecode BPF_BYTECODE\n"
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" bytecode-file FILE\n"
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"\n"
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"eBPF use case:\n"
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" object-file FILE [ section CLS_NAME ] [ export UDS_FILE ]"
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" [ verbose ] [ direct-action ] [ skip_hw | skip_sw ]\n"
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" object-pinned FILE [ direct-action ] [ skip_hw | skip_sw ]\n"
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"\n"
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"Common remaining options:\n"
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" [ action ACTION_SPEC ]\n"
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" [ classid CLASSID ]\n"
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"\n"
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"Where BPF_BYTECODE := \'s,c t f k,c t f k,c t f k,...\'\n"
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"c,t,f,k and s are decimals; s denotes number of 4-tuples\n"
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"\n"
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"Where FILE points to a file containing the BPF_BYTECODE string,\n"
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"an ELF file containing eBPF map definitions and bytecode, or a\n"
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"pinned eBPF program.\n"
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"\n"
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"Where CLS_NAME refers to the section name containing the\n"
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"classifier (default \'%s\').\n"
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"\n"
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"Where UDS_FILE points to a unix domain socket file in order\n"
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"to hand off control of all created eBPF maps to an agent.\n"
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"\n"
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"ACTION_SPEC := ... look at individual actions\n"
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"NOTE: CLASSID is parsed as hexadecimal input.\n",
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bpf_prog_to_default_section(bpf_type));
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}
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static void bpf_cbpf_cb(void *nl, const struct sock_filter *ops, int ops_len)
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{
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addattr16(nl, MAX_MSG, TCA_BPF_OPS_LEN, ops_len);
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addattr_l(nl, MAX_MSG, TCA_BPF_OPS, ops,
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ops_len * sizeof(struct sock_filter));
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}
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static void bpf_ebpf_cb(void *nl, int fd, const char *annotation)
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{
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addattr32(nl, MAX_MSG, TCA_BPF_FD, fd);
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addattrstrz(nl, MAX_MSG, TCA_BPF_NAME, annotation);
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}
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static const struct bpf_cfg_ops bpf_cb_ops = {
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.cbpf_cb = bpf_cbpf_cb,
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.ebpf_cb = bpf_ebpf_cb,
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};
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static int bpf_parse_opt(struct filter_util *qu, char *handle,
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int argc, char **argv, struct nlmsghdr *n)
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{
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const char *bpf_obj = NULL, *bpf_uds_name = NULL;
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struct tcmsg *t = NLMSG_DATA(n);
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unsigned int bpf_gen_flags = 0;
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unsigned int bpf_flags = 0;
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struct bpf_cfg_in cfg = {};
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bool seen_run = false;
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bool skip_sw = false;
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struct rtattr *tail;
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int ret = 0;
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if (handle) {
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if (get_u32(&t->tcm_handle, handle, 0)) {
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fprintf(stderr, "Illegal \"handle\"\n");
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return -1;
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}
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}
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if (argc == 0)
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return 0;
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tail = (struct rtattr *)(((void *)n) + NLMSG_ALIGN(n->nlmsg_len));
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addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
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while (argc > 0) {
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if (matches(*argv, "run") == 0) {
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NEXT_ARG();
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if (seen_run)
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duparg("run", *argv);
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opt_bpf:
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seen_run = true;
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cfg.type = bpf_type;
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cfg.argc = argc;
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cfg.argv = argv;
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if (bpf_parse_common(&cfg, &bpf_cb_ops) < 0) {
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fprintf(stderr,
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"Unable to parse bpf command line\n");
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return -1;
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}
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argc = cfg.argc;
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argv = cfg.argv;
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bpf_obj = cfg.object;
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bpf_uds_name = cfg.uds;
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} else if (matches(*argv, "classid") == 0 ||
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matches(*argv, "flowid") == 0) {
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unsigned int handle;
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NEXT_ARG();
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if (get_tc_classid(&handle, *argv)) {
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fprintf(stderr, "Illegal \"classid\"\n");
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return -1;
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}
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addattr32(n, MAX_MSG, TCA_BPF_CLASSID, handle);
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} else if (matches(*argv, "direct-action") == 0 ||
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matches(*argv, "da") == 0) {
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bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
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} else if (matches(*argv, "skip_hw") == 0) {
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bpf_gen_flags |= TCA_CLS_FLAGS_SKIP_HW;
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} else if (matches(*argv, "skip_sw") == 0) {
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bpf_gen_flags |= TCA_CLS_FLAGS_SKIP_SW;
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skip_sw = true;
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} else if (matches(*argv, "action") == 0) {
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NEXT_ARG();
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if (parse_action(&argc, &argv, TCA_BPF_ACT, n)) {
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fprintf(stderr, "Illegal \"action\"\n");
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return -1;
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}
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continue;
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} else if (matches(*argv, "police") == 0) {
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NEXT_ARG();
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if (parse_police(&argc, &argv, TCA_BPF_POLICE, n)) {
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fprintf(stderr, "Illegal \"police\"\n");
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return -1;
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}
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continue;
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} else if (matches(*argv, "help") == 0) {
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explain();
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return -1;
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} else {
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if (!seen_run)
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goto opt_bpf;
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fprintf(stderr, "What is \"%s\"?\n", *argv);
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explain();
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return -1;
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}
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NEXT_ARG_FWD();
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}
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if (skip_sw)
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cfg.ifindex = t->tcm_ifindex;
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if (bpf_load_common(&cfg, &bpf_cb_ops, n) < 0) {
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fprintf(stderr, "Unable to load program\n");
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return -1;
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}
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if (bpf_gen_flags)
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addattr32(n, MAX_MSG, TCA_BPF_FLAGS_GEN, bpf_gen_flags);
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if (bpf_flags)
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addattr32(n, MAX_MSG, TCA_BPF_FLAGS, bpf_flags);
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tail->rta_len = (((void *)n) + n->nlmsg_len) - (void *)tail;
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if (bpf_uds_name)
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ret = bpf_send_map_fds(bpf_uds_name, bpf_obj);
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return ret;
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}
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static int bpf_print_opt(struct filter_util *qu, FILE *f,
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struct rtattr *opt, __u32 handle)
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{
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struct rtattr *tb[TCA_BPF_MAX + 1];
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int dump_ok = 0;
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if (opt == NULL)
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return 0;
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parse_rtattr_nested(tb, TCA_BPF_MAX, opt);
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if (handle)
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print_0xhex(PRINT_ANY, "handle", "handle %#llx ", handle);
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if (tb[TCA_BPF_CLASSID]) {
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SPRINT_BUF(b1);
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print_string(PRINT_ANY, "flowid", "flowid %s ",
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sprint_tc_classid(rta_getattr_u32(tb[TCA_BPF_CLASSID]), b1));
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}
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if (tb[TCA_BPF_NAME])
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print_string(PRINT_ANY, "bpf_name", "%s ",
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rta_getattr_str(tb[TCA_BPF_NAME]));
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if (tb[TCA_BPF_FLAGS]) {
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unsigned int flags = rta_getattr_u32(tb[TCA_BPF_FLAGS]);
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if (flags & TCA_BPF_FLAG_ACT_DIRECT)
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print_bool(PRINT_ANY,
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"direct-action", "direct-action ", true);
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}
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if (tb[TCA_BPF_FLAGS_GEN]) {
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unsigned int flags =
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rta_getattr_u32(tb[TCA_BPF_FLAGS_GEN]);
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if (flags & TCA_CLS_FLAGS_SKIP_HW)
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print_bool(PRINT_ANY, "skip_hw", "skip_hw ", true);
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if (flags & TCA_CLS_FLAGS_SKIP_SW)
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print_bool(PRINT_ANY, "skip_sw", "skip_sw ", true);
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if (flags & TCA_CLS_FLAGS_IN_HW)
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print_bool(PRINT_ANY, "in_hw", "in_hw ", true);
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else if (flags & TCA_CLS_FLAGS_NOT_IN_HW)
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print_bool(PRINT_ANY,
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"not_in_hw", "not_in_hw ", true);
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}
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if (tb[TCA_BPF_OPS] && tb[TCA_BPF_OPS_LEN])
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bpf_print_ops(tb[TCA_BPF_OPS],
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rta_getattr_u16(tb[TCA_BPF_OPS_LEN]));
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if (tb[TCA_BPF_ID])
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dump_ok = bpf_dump_prog_info(f, rta_getattr_u32(tb[TCA_BPF_ID]));
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if (!dump_ok && tb[TCA_BPF_TAG]) {
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SPRINT_BUF(b);
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print_string(PRINT_ANY, "tag", "tag %s ",
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hexstring_n2a(RTA_DATA(tb[TCA_BPF_TAG]),
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RTA_PAYLOAD(tb[TCA_BPF_TAG]), b, sizeof(b)));
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}
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if (tb[TCA_BPF_POLICE]) {
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print_nl();
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tc_print_police(f, tb[TCA_BPF_POLICE]);
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}
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if (tb[TCA_BPF_ACT])
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tc_print_action(f, tb[TCA_BPF_ACT], 0);
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return 0;
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}
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struct filter_util bpf_filter_util = {
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.id = "bpf",
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.parse_fopt = bpf_parse_opt,
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.print_fopt = bpf_print_opt,
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};
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