[mirror_iproute2.git] / tc / m_bpf.c

/*
 * m_bpf.c	BFP based action module
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Authors:     Jiri Pirko <jiri@resnulli.us>
 *              Daniel Borkmann <daniel@iogearbox.net>
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdbool.h>
#include <libgen.h>
#include <linux/bpf.h>
#include <linux/tc_act/tc_bpf.h>

#include "utils.h"
#include "rt_names.h"
#include "tc_util.h"
#include "tc_bpf.h"

static const enum bpf_prog_type bpf_type = BPF_PROG_TYPE_SCHED_ACT;

static void explain(void)
{
	fprintf(stderr, "Usage: ... bpf ...\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "BPF use case:\n");
	fprintf(stderr, " bytecode BPF_BYTECODE\n");
	fprintf(stderr, " bytecode-file FILE\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "eBPF use case:\n");
	fprintf(stderr, " object-file FILE [ section ACT_NAME ] [ export UDS_FILE ]\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "Where BPF_BYTECODE := \'s,c t f k,c t f k,c t f k,...\'\n");
	fprintf(stderr, "c,t,f,k and s are decimals; s denotes number of 4-tuples\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "Where FILE points to a file containing the BPF_BYTECODE string,\n");
	fprintf(stderr, "an ELF file containing eBPF map definitions and bytecode.\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "Where ACT_NAME refers to the section name containing the\n");
	fprintf(stderr, "action (default \'%s\').\n", bpf_default_section(bpf_type));
	fprintf(stderr, "\n");
	fprintf(stderr, "Where UDS_FILE points to a unix domain socket file in order\n");
	fprintf(stderr, "to hand off control of all created eBPF maps to an agent.\n");
}

static void usage(void)
{
	explain();
	exit(-1);
}

static int parse_bpf(struct action_util *a, int *argc_p, char ***argv_p,
		     int tca_id, struct nlmsghdr *n)
{
	char **argv = *argv_p, bpf_name[256];
	struct rtattr *tail;
	struct tc_act_bpf parm = { 0 };
	struct sock_filter bpf_ops[BPF_MAXINSNS];
	bool ebpf = false, seen_run = false;
	const char *bpf_uds_name = NULL;
	const char *bpf_sec_name = NULL;
	char *bpf_obj = NULL;
	int argc = *argc_p, ret = 0;
	__u16 bpf_len = 0;
	__u32 bpf_fd = 0;

	if (matches(*argv, "bpf") != 0)
		return -1;

	NEXT_ARG();

	while (argc > 0) {
		if (matches(*argv, "run") == 0) {
			bool from_file;
			int ret;

			NEXT_ARG();
opt_bpf:
			bpf_sec_name = bpf_default_section(bpf_type);
			seen_run = true;

			if (strcmp(*argv, "bytecode-file") == 0 ||
			    strcmp(*argv, "bcf") == 0) {
				from_file = true;
			} else if (strcmp(*argv, "bytecode") == 0 ||
				   strcmp(*argv, "bc") == 0) {
				from_file = false;
			} else if (strcmp(*argv, "object-file") == 0 ||
				   strcmp(*argv, "obj") == 0) {
				ebpf = true;
			} else {
				fprintf(stderr, "unexpected \"%s\"\n", *argv);
				explain();
				return -1;
			}

			NEXT_ARG();
			if (ebpf) {
				bpf_obj = *argv;
				NEXT_ARG();

				if (strcmp(*argv, "section") == 0 ||
				    strcmp(*argv, "sec") == 0) {
					NEXT_ARG();
					bpf_sec_name = *argv;
					NEXT_ARG();
				}
				if (strcmp(*argv, "export") == 0 ||
				    strcmp(*argv, "exp") == 0) {
					NEXT_ARG();
					bpf_uds_name = *argv;
					NEXT_ARG();
				}

				PREV_ARG();
			}

			ret = ebpf ? bpf_open_object(bpf_obj, bpf_type, bpf_sec_name) :
				     bpf_parse_ops(argc, argv, bpf_ops, from_file);
			if (ret < 0) {
				fprintf(stderr, "%s\n", ebpf ?
					"Could not load object" :
					"Illegal \"bytecode\"");
				return -1;
			}

			if (ebpf) {
				bpf_obj = basename(bpf_obj);

				snprintf(bpf_name, sizeof(bpf_name), "%s:[%s]",
					 bpf_obj, bpf_sec_name);

				bpf_fd = ret;
			} else {
				bpf_len = ret;
			}
		} else if (matches(*argv, "help") == 0) {
			usage();
		} else {
			if (!seen_run)
				goto opt_bpf;
			break;
		}
		argc--;
		argv++;
	}

	parm.action = TC_ACT_PIPE;
	if (argc) {
		if (matches(*argv, "reclassify") == 0) {
			parm.action = TC_ACT_RECLASSIFY;
			argc--;
			argv++;
		} else if (matches(*argv, "pipe") == 0) {
			parm.action = TC_ACT_PIPE;
			argc--;
			argv++;
		} else if (matches(*argv, "drop") == 0 ||
			   matches(*argv, "shot") == 0) {
			parm.action = TC_ACT_SHOT;
			argc--;
			argv++;
		} else if (matches(*argv, "continue") == 0) {
			parm.action = TC_ACT_UNSPEC;
			argc--;
			argv++;
		} else if (matches(*argv, "pass") == 0) {
			parm.action = TC_ACT_OK;
			argc--;
			argv++;
		}
	}

	if (argc) {
		if (matches(*argv, "index") == 0) {
			NEXT_ARG();
			if (get_u32(&parm.index, *argv, 10)) {
				fprintf(stderr, "bpf: Illegal \"index\"\n");
				return -1;
			}
			argc--;
			argv++;
		}
	}

	if ((!bpf_len && !ebpf) || (!bpf_fd && ebpf)) {
		fprintf(stderr, "bpf: Bytecode needs to be passed\n");
		explain();
		return -1;
	}

	tail = NLMSG_TAIL(n);

	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
	addattr_l(n, MAX_MSG, TCA_ACT_BPF_PARMS, &parm, sizeof(parm));

	if (ebpf) {
		addattr32(n, MAX_MSG, TCA_ACT_BPF_FD, bpf_fd);
		addattrstrz(n, MAX_MSG, TCA_ACT_BPF_NAME, bpf_name);
	} else {
		addattr16(n, MAX_MSG, TCA_ACT_BPF_OPS_LEN, bpf_len);
		addattr_l(n, MAX_MSG, TCA_ACT_BPF_OPS, &bpf_ops,
			  bpf_len * sizeof(struct sock_filter));
	}

	tail->rta_len = (char *)NLMSG_TAIL(n) - (char *)tail;

	*argc_p = argc;
	*argv_p = argv;

	if (bpf_uds_name)
		ret = bpf_send_map_fds(bpf_uds_name, bpf_obj);

	return ret;
}

static int print_bpf(struct action_util *au, FILE *f, struct rtattr *arg)
{
	struct rtattr *tb[TCA_ACT_BPF_MAX + 1];
	struct tc_act_bpf *parm;
	SPRINT_BUF(action_buf);

	if (arg == NULL)
		return -1;

	parse_rtattr_nested(tb, TCA_ACT_BPF_MAX, arg);

	if (!tb[TCA_ACT_BPF_PARMS]) {
		fprintf(f, "[NULL bpf parameters]");
		return -1;
	}

	parm = RTA_DATA(tb[TCA_ACT_BPF_PARMS]);

	fprintf(f, "bpf ");

	if (tb[TCA_ACT_BPF_NAME])
		fprintf(f, "%s ", rta_getattr_str(tb[TCA_ACT_BPF_NAME]));
	else if (tb[TCA_ACT_BPF_FD])
		fprintf(f, "pfd %u ", rta_getattr_u32(tb[TCA_ACT_BPF_FD]));

	if (tb[TCA_ACT_BPF_OPS] && tb[TCA_ACT_BPF_OPS_LEN]) {
		bpf_print_ops(f, tb[TCA_ACT_BPF_OPS],
			      rta_getattr_u16(tb[TCA_ACT_BPF_OPS_LEN]));
		fprintf(f, " ");
	}

	fprintf(f, "default-action %s\n", action_n2a(parm->action, action_buf,
		sizeof(action_buf)));
	fprintf(f, "\tindex %d ref %d bind %d", parm->index, parm->refcnt,
		parm->bindcnt);

	if (show_stats) {
		if (tb[TCA_ACT_BPF_TM]) {
			struct tcf_t *tm = RTA_DATA(tb[TCA_ACT_BPF_TM]);
			print_tm(f, tm);
		}
	}

	fprintf(f, "\n ");

	return 0;
}

struct action_util bpf_action_util = {
	.id = "bpf",
	.parse_aopt = parse_bpf,
	.print_aopt = print_bpf,
};
Commit	Line	Data
86ab59a6 JP	1	/*
	2	* m_bpf.c BFP based action module
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Jiri Pirko <jiri@resnulli.us>
6256f8c9	10	* Daniel Borkmann <daniel@iogearbox.net>
86ab59a6 JP	11	*/
	12
	13	#include <stdio.h>
	14	#include <stdlib.h>
	15	#include <unistd.h>
	16	#include <string.h>
	17	#include <stdbool.h>
6256f8c9 DB	18	#include <libgen.h>
6256f8c9 DB	19	#include <linux/bpf.h>
86ab59a6 JP	20	#include <linux/tc_act/tc_bpf.h>
	21
	22	#include "utils.h"
	23	#include "rt_names.h"
	24	#include "tc_util.h"
	25	#include "tc_bpf.h"
	26
6256f8c9 DB	27	static const enum bpf_prog_type bpf_type = BPF_PROG_TYPE_SCHED_ACT;
6256f8c9 DB	28
86ab59a6 JP	29	static void explain(void)
	30	{
	31	fprintf(stderr, "Usage: ... bpf ...\n");
	32	fprintf(stderr, "\n");
6256f8c9 DB	33	fprintf(stderr, "BPF use case:\n");
	34	fprintf(stderr, " bytecode BPF_BYTECODE\n");
	35	fprintf(stderr, " bytecode-file FILE\n");
	36	fprintf(stderr, "\n");
	37	fprintf(stderr, "eBPF use case:\n");
	38	fprintf(stderr, " object-file FILE [ section ACT_NAME ] [ export UDS_FILE ]\n");
86ab59a6 JP	39	fprintf(stderr, "\n");
86ab59a6 JP	40	fprintf(stderr, "Where BPF_BYTECODE := \'s,c t f k,c t f k,c t f k,...\'\n");
6256f8c9 DB	41	fprintf(stderr, "c,t,f,k and s are decimals; s denotes number of 4-tuples\n");
	42	fprintf(stderr, "\n");
	43	fprintf(stderr, "Where FILE points to a file containing the BPF_BYTECODE string,\n");
	44	fprintf(stderr, "an ELF file containing eBPF map definitions and bytecode.\n");
	45	fprintf(stderr, "\n");
	46	fprintf(stderr, "Where ACT_NAME refers to the section name containing the\n");
	47	fprintf(stderr, "action (default \'%s\').\n", bpf_default_section(bpf_type));
	48	fprintf(stderr, "\n");
	49	fprintf(stderr, "Where UDS_FILE points to a unix domain socket file in order\n");
	50	fprintf(stderr, "to hand off control of all created eBPF maps to an agent.\n");
86ab59a6 JP	51	}
	52
	53	static void usage(void)
	54	{
	55	explain();
	56	exit(-1);
	57	}
	58
	59	static int parse_bpf(struct action_util a, int argc_p, char ***argv_p,
	60	int tca_id, struct nlmsghdr *n)
	61	{
6256f8c9	62	char *argv = argv_p, bpf_name[256];
86ab59a6 JP	63	struct rtattr *tail;
	64	struct tc_act_bpf parm = { 0 };
	65	struct sock_filter bpf_ops[BPF_MAXINSNS];
6256f8c9 DB	66	bool ebpf = false, seen_run = false;
	67	const char *bpf_uds_name = NULL;
	68	const char *bpf_sec_name = NULL;
	69	char *bpf_obj = NULL;
	70	int argc = *argc_p, ret = 0;
86ab59a6	71	__u16 bpf_len = 0;
6256f8c9	72	__u32 bpf_fd = 0;
86ab59a6 JP	73
	74	if (matches(*argv, "bpf") != 0)
	75	return -1;
	76
	77	NEXT_ARG();
	78
	79	while (argc > 0) {
	80	if (matches(*argv, "run") == 0) {
	81	bool from_file;
	82	int ret;
	83
	84	NEXT_ARG();
6256f8c9 DB	85	opt_bpf:
	86	bpf_sec_name = bpf_default_section(bpf_type);
	87	seen_run = true;
	88
	89	if (strcmp(*argv, "bytecode-file") == 0 \|\|
	90	strcmp(*argv, "bcf") == 0) {
86ab59a6	91	from_file = true;
6256f8c9 DB	92	} else if (strcmp(*argv, "bytecode") == 0 \|\|
6256f8c9 DB	93	strcmp(*argv, "bc") == 0) {
86ab59a6	94	from_file = false;
6256f8c9 DB	95	} else if (strcmp(*argv, "object-file") == 0 \|\|
	96	strcmp(*argv, "obj") == 0) {
	97	ebpf = true;
86ab59a6 JP	98	} else {
	99	fprintf(stderr, "unexpected \"%s\"\n", *argv);
	100	explain();
	101	return -1;
	102	}
6256f8c9	103
86ab59a6	104	NEXT_ARG();
6256f8c9 DB	105	if (ebpf) {
	106	bpf_obj = *argv;
	107	NEXT_ARG();
	108
	109	if (strcmp(*argv, "section") == 0 \|\|
	110	strcmp(*argv, "sec") == 0) {
	111	NEXT_ARG();
	112	bpf_sec_name = *argv;
	113	NEXT_ARG();
	114	}
	115	if (strcmp(*argv, "export") == 0 \|\|
	116	strcmp(*argv, "exp") == 0) {
	117	NEXT_ARG();
	118	bpf_uds_name = *argv;
	119	NEXT_ARG();
	120	}
	121
	122	PREV_ARG();
	123	}
	124
	125	ret = ebpf ? bpf_open_object(bpf_obj, bpf_type, bpf_sec_name) :
	126	bpf_parse_ops(argc, argv, bpf_ops, from_file);
86ab59a6	127	if (ret < 0) {
6256f8c9 DB	128	fprintf(stderr, "%s\n", ebpf ?
	129	"Could not load object" :
	130	"Illegal \"bytecode\"");
86ab59a6 JP	131	return -1;
86ab59a6 JP	132	}
6256f8c9 DB	133
	134	if (ebpf) {
	135	bpf_obj = basename(bpf_obj);
	136
	137	snprintf(bpf_name, sizeof(bpf_name), "%s:[%s]",
	138	bpf_obj, bpf_sec_name);
	139
	140	bpf_fd = ret;
	141	} else {
	142	bpf_len = ret;
	143	}
86ab59a6 JP	144	} else if (matches(*argv, "help") == 0) {
	145	usage();
	146	} else {
6256f8c9 DB	147	if (!seen_run)
6256f8c9 DB	148	goto opt_bpf;
86ab59a6 JP	149	break;
	150	}
	151	argc--;
	152	argv++;
	153	}
	154
	155	parm.action = TC_ACT_PIPE;
	156	if (argc) {
	157	if (matches(*argv, "reclassify") == 0) {
	158	parm.action = TC_ACT_RECLASSIFY;
51cf3675 DB	159	argc--;
51cf3675 DB	160	argv++;
86ab59a6 JP	161	} else if (matches(*argv, "pipe") == 0) {
86ab59a6 JP	162	parm.action = TC_ACT_PIPE;
51cf3675 DB	163	argc--;
51cf3675 DB	164	argv++;
86ab59a6 JP	165	} else if (matches(*argv, "drop") == 0 \|\|
	166	matches(*argv, "shot") == 0) {
	167	parm.action = TC_ACT_SHOT;
51cf3675 DB	168	argc--;
51cf3675 DB	169	argv++;
86ab59a6 JP	170	} else if (matches(*argv, "continue") == 0) {
86ab59a6 JP	171	parm.action = TC_ACT_UNSPEC;
51cf3675 DB	172	argc--;
51cf3675 DB	173	argv++;
86ab59a6 JP	174	} else if (matches(*argv, "pass") == 0) {
86ab59a6 JP	175	parm.action = TC_ACT_OK;
51cf3675 DB	176	argc--;
51cf3675 DB	177	argv++;
86ab59a6 JP	178	}
	179	}
	180
	181	if (argc) {
	182	if (matches(*argv, "index") == 0) {
	183	NEXT_ARG();
	184	if (get_u32(&parm.index, *argv, 10)) {
	185	fprintf(stderr, "bpf: Illegal \"index\"\n");
	186	return -1;
	187	}
	188	argc--;
	189	argv++;
	190	}
	191	}
	192
6256f8c9	193	if ((!bpf_len && !ebpf) \|\| (!bpf_fd && ebpf)) {
86ab59a6 JP	194	fprintf(stderr, "bpf: Bytecode needs to be passed\n");
	195	explain();
	196	return -1;
	197	}
	198
	199	tail = NLMSG_TAIL(n);
6256f8c9	200
86ab59a6 JP	201	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
86ab59a6 JP	202	addattr_l(n, MAX_MSG, TCA_ACT_BPF_PARMS, &parm, sizeof(parm));
6256f8c9 DB	203
	204	if (ebpf) {
	205	addattr32(n, MAX_MSG, TCA_ACT_BPF_FD, bpf_fd);
	206	addattrstrz(n, MAX_MSG, TCA_ACT_BPF_NAME, bpf_name);
	207	} else {
	208	addattr16(n, MAX_MSG, TCA_ACT_BPF_OPS_LEN, bpf_len);
	209	addattr_l(n, MAX_MSG, TCA_ACT_BPF_OPS, &bpf_ops,
	210	bpf_len * sizeof(struct sock_filter));
	211	}
	212
86ab59a6 JP	213	tail->rta_len = (char )NLMSG_TAIL(n) - (char )tail;
	214
	215	*argc_p = argc;
	216	*argv_p = argv;
6256f8c9 DB	217
6256f8c9 DB	218	if (bpf_uds_name)
4bd62446	219	ret = bpf_send_map_fds(bpf_uds_name, bpf_obj);
6256f8c9 DB	220
6256f8c9 DB	221	return ret;
86ab59a6 JP	222	}
	223
	224	static int print_bpf(struct action_util au, FILE f, struct rtattr *arg)
	225	{
	226	struct rtattr *tb[TCA_ACT_BPF_MAX + 1];
	227	struct tc_act_bpf *parm;
6256f8c9	228	SPRINT_BUF(action_buf);
86ab59a6 JP	229
	230	if (arg == NULL)
	231	return -1;
	232
	233	parse_rtattr_nested(tb, TCA_ACT_BPF_MAX, arg);
	234
	235	if (!tb[TCA_ACT_BPF_PARMS]) {
	236	fprintf(f, "[NULL bpf parameters]");
	237	return -1;
	238	}
6256f8c9	239
86ab59a6 JP	240	parm = RTA_DATA(tb[TCA_ACT_BPF_PARMS]);
86ab59a6 JP	241
6256f8c9 DB	242	fprintf(f, "bpf ");
	243
	244	if (tb[TCA_ACT_BPF_NAME])
	245	fprintf(f, "%s ", rta_getattr_str(tb[TCA_ACT_BPF_NAME]));
	246	else if (tb[TCA_ACT_BPF_FD])
	247	fprintf(f, "pfd %u ", rta_getattr_u32(tb[TCA_ACT_BPF_FD]));
86ab59a6	248
6256f8c9	249	if (tb[TCA_ACT_BPF_OPS] && tb[TCA_ACT_BPF_OPS_LEN]) {
86ab59a6 JP	250	bpf_print_ops(f, tb[TCA_ACT_BPF_OPS],
86ab59a6 JP	251	rta_getattr_u16(tb[TCA_ACT_BPF_OPS_LEN]));
6256f8c9 DB	252	fprintf(f, " ");
6256f8c9 DB	253	}
86ab59a6	254
6256f8c9 DB	255	fprintf(f, "default-action %s\n", action_n2a(parm->action, action_buf,
	256	sizeof(action_buf)));
	257	fprintf(f, "\tindex %d ref %d bind %d", parm->index, parm->refcnt,
86ab59a6 JP	258	parm->bindcnt);
	259
	260	if (show_stats) {
	261	if (tb[TCA_ACT_BPF_TM]) {
	262	struct tcf_t *tm = RTA_DATA(tb[TCA_ACT_BPF_TM]);
	263	print_tm(f, tm);
	264	}
	265	}
	266
	267	fprintf(f, "\n ");
	268
	269	return 0;
	270	}
	271
	272	struct action_util bpf_action_util = {
	273	.id = "bpf",
	274	.parse_aopt = parse_bpf,
	275	.print_aopt = print_bpf,
	276	};