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/*
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* m_bpf.c BPF based action module
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*
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* This program is free software; you can redistribute 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: Jiri Pirko <jiri@resnulli.us>
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* 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 <linux/tc_act/tc_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_ACT;
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static void explain(void)
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{
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fprintf(stderr,
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"Usage: ... bpf ... [ index INDEX ]\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 ACT_NAME ] [ export UDS_FILE ]"
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" [ verbose ]\n"
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" object-pinned FILE\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 ACT_NAME refers to the section name containing the\n"
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"action (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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"Where optionally INDEX points to an existing action, or\n"
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"explicitly specifies an action index upon creation.\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_ACT_BPF_OPS_LEN, ops_len);
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addattr_l(nl, MAX_MSG, TCA_ACT_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_ACT_BPF_FD, fd);
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addattrstrz(nl, MAX_MSG, TCA_ACT_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 action_util *a, int *ptr_argc, char ***ptr_argv,
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int tca_id, 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 tc_act_bpf parm = {};
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struct bpf_cfg_in cfg = {};
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bool seen_run = false;
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struct rtattr *tail;
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int argc, ret = 0;
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char **argv;
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argv = *ptr_argv;
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argc = *ptr_argc;
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if (matches(*argv, "bpf") != 0)
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return -1;
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NEXT_ARG();
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tail = addattr_nest(n, MAX_MSG, tca_id);
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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_and_load_common(&cfg, &bpf_cb_ops, n))
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return -1;
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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, "help") == 0) {
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explain();
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return -1;
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} else if (matches(*argv, "index") == 0) {
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break;
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} else {
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if (!seen_run)
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goto opt_bpf;
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break;
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}
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NEXT_ARG_FWD();
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}
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parse_action_control_dflt(&argc, &argv, &parm.action,
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false, TC_ACT_PIPE);
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if (argc) {
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if (matches(*argv, "index") == 0) {
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NEXT_ARG();
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if (get_u32(&parm.index, *argv, 10)) {
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fprintf(stderr, "bpf: Illegal \"index\"\n");
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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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}
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addattr_l(n, MAX_MSG, TCA_ACT_BPF_PARMS, &parm, sizeof(parm));
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addattr_nest_end(n, 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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*ptr_argc = argc;
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*ptr_argv = argv;
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return ret;
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}
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static int bpf_print_opt(struct action_util *au, FILE *f, struct rtattr *arg)
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{
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struct rtattr *tb[TCA_ACT_BPF_MAX + 1];
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struct tc_act_bpf *parm;
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int d_ok = 0;
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if (arg == NULL)
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return -1;
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parse_rtattr_nested(tb, TCA_ACT_BPF_MAX, arg);
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if (!tb[TCA_ACT_BPF_PARMS]) {
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fprintf(stderr, "Missing bpf parameters\n");
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return -1;
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}
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parm = RTA_DATA(tb[TCA_ACT_BPF_PARMS]);
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print_string(PRINT_ANY, "kind", "%s ", "bpf");
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if (tb[TCA_ACT_BPF_NAME])
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print_string(PRINT_ANY, "bpf_name", "%s ",
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rta_getattr_str(tb[TCA_ACT_BPF_NAME]));
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if (tb[TCA_ACT_BPF_OPS] && tb[TCA_ACT_BPF_OPS_LEN]) {
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bpf_print_ops(tb[TCA_ACT_BPF_OPS],
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rta_getattr_u16(tb[TCA_ACT_BPF_OPS_LEN]));
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print_string(PRINT_FP, NULL, "%s", " ");
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}
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if (tb[TCA_ACT_BPF_ID])
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d_ok = bpf_dump_prog_info(f,
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rta_getattr_u32(tb[TCA_ACT_BPF_ID]));
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if (!d_ok && tb[TCA_ACT_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_ACT_BPF_TAG]),
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RTA_PAYLOAD(tb[TCA_ACT_BPF_TAG]),
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b, sizeof(b)));
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}
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print_action_control(f, "default-action ", parm->action, _SL_);
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print_uint(PRINT_ANY, "index", "\t index %u", parm->index);
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print_int(PRINT_ANY, "ref", " ref %d", parm->refcnt);
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print_int(PRINT_ANY, "bind", " bind %d", parm->bindcnt);
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if (show_stats) {
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if (tb[TCA_ACT_BPF_TM]) {
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struct tcf_t *tm = RTA_DATA(tb[TCA_ACT_BPF_TM]);
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print_tm(f, tm);
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}
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}
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fprintf(f, "\n ");
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return 0;
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}
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struct action_util bpf_action_util = {
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.id = "bpf",
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.parse_aopt = bpf_parse_opt,
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.print_aopt = bpf_print_opt,
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};
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