Blame tc/m_csum.c

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/*
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 * m_csum.c	checksum updating action
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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: Gregoire Baron <baronchon@n7mm.org>
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 */
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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 <unistd.h>
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#include <linux/tc_act/tc_csum.h>
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#include "utils.h"
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#include "tc_util.h"
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static void
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explain(void)
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{
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	fprintf(stderr, "Usage: ... csum <UPDATE>\n"
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			"Where: UPDATE := <TARGET> [<UPDATE>]\n"
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			"       TARGET := { ip4h | icmp | igmp | tcp | udp | udplite | sctp | <SWEETS> }\n"
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			"       SWEETS := { and | or | \'+\' }\n");
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}
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static void
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usage(void)
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{
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	explain();
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	exit(-1);
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}
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static int
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parse_csum_args(int *argc_p, char ***argv_p, struct tc_csum *sel)
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{
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	int argc = *argc_p;
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	char **argv = *argv_p;
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	if (argc <= 0)
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		return -1;
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	while (argc > 0) {
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		if ((matches(*argv, "iph") == 0) ||
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		    (matches(*argv, "ip4h") == 0) ||
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		    (matches(*argv, "ipv4h") == 0))
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			sel->update_flags |= TCA_CSUM_UPDATE_FLAG_IPV4HDR;
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		else if (matches(*argv, "icmp") == 0)
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			sel->update_flags |= TCA_CSUM_UPDATE_FLAG_ICMP;
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		else if (matches(*argv, "igmp") == 0)
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			sel->update_flags |= TCA_CSUM_UPDATE_FLAG_IGMP;
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		else if (matches(*argv, "tcp") == 0)
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			sel->update_flags |= TCA_CSUM_UPDATE_FLAG_TCP;
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		else if (matches(*argv, "udp") == 0)
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			sel->update_flags |= TCA_CSUM_UPDATE_FLAG_UDP;
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		else if (matches(*argv, "udplite") == 0)
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			sel->update_flags |= TCA_CSUM_UPDATE_FLAG_UDPLITE;
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		else if (matches(*argv, "sctp") == 0)
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			sel->update_flags |= TCA_CSUM_UPDATE_FLAG_SCTP;
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		else if ((matches(*argv, "and") == 0) ||
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			 (matches(*argv, "or") == 0) ||
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			 (matches(*argv, "+") == 0))
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			; /* just ignore: ... csum iph and tcp or udp */
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		else
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			break;
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		argc--;
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		argv++;
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	}
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	*argc_p = argc;
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	*argv_p = argv;
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	return 0;
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}
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static int
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parse_csum(struct action_util *a, int *argc_p,
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	   char ***argv_p, int tca_id, struct nlmsghdr *n)
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{
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	struct tc_csum sel = {};
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	int argc = *argc_p;
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	char **argv = *argv_p;
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	int ok = 0;
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	struct rtattr *tail;
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	while (argc > 0) {
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		if (matches(*argv, "csum") == 0) {
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			NEXT_ARG();
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			if (parse_csum_args(&argc, &argv, &sel)) {
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				fprintf(stderr, "Illegal csum construct (%s)\n",
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					*argv);
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				explain();
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				return -1;
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			}
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			ok++;
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			continue;
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		} else if (matches(*argv, "help") == 0) {
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			usage();
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		} else {
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			break;
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		}
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	}
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	if (!ok) {
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		explain();
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		return -1;
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	}
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	if (sel.update_flags == 0) {
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		fprintf(stderr, "Illegal csum construct, empty <UPDATE> list\n");
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		return -1;
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	}
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	parse_action_control_dflt(&argc, &argv, &sel.action, false, TC_ACT_OK);
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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(&sel.index, *argv, 10)) {
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				fprintf(stderr, "Illegal \"index\" (%s) <csum>\n",
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					*argv);
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				return -1;
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			}
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			argc--;
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			argv++;
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		}
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	}
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	tail = addattr_nest(n, MAX_MSG, tca_id);
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	addattr_l(n, MAX_MSG, TCA_CSUM_PARMS, &sel, sizeof(sel));
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	addattr_nest_end(n, tail);
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	*argc_p = argc;
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	*argv_p = argv;
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	return 0;
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}
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static int
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print_csum(struct action_util *au, FILE *f, struct rtattr *arg)
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{
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	struct tc_csum *sel;
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	struct rtattr *tb[TCA_CSUM_MAX + 1];
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	char *uflag_1 = "";
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	char *uflag_2 = "";
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	char *uflag_3 = "";
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	char *uflag_4 = "";
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	char *uflag_5 = "";
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	char *uflag_6 = "";
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	char *uflag_7 = "";
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	SPRINT_BUF(buf);
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	int uflag_count = 0;
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	if (arg == NULL)
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		return -1;
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	parse_rtattr_nested(tb, TCA_CSUM_MAX, arg);
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	if (tb[TCA_CSUM_PARMS] == NULL) {
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		fprintf(stderr, "Missing csum parameters\n");
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		return -1;
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	}
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	sel = RTA_DATA(tb[TCA_CSUM_PARMS]);
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	if (sel->update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
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		uflag_1 = "iph";
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		uflag_count++;
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	}
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	#define CSUM_UFLAG_BUFFER(flag_buffer, flag_value, flag_string)	\
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		do {							\
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			if (sel->update_flags & flag_value) {		\
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				flag_buffer = uflag_count > 0 ?		\
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					", " flag_string : flag_string; \
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				uflag_count++;				\
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			}						\
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		} while (0)
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	CSUM_UFLAG_BUFFER(uflag_2, TCA_CSUM_UPDATE_FLAG_ICMP, "icmp");
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	CSUM_UFLAG_BUFFER(uflag_3, TCA_CSUM_UPDATE_FLAG_IGMP, "igmp");
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	CSUM_UFLAG_BUFFER(uflag_4, TCA_CSUM_UPDATE_FLAG_TCP, "tcp");
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	CSUM_UFLAG_BUFFER(uflag_5, TCA_CSUM_UPDATE_FLAG_UDP, "udp");
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	CSUM_UFLAG_BUFFER(uflag_6, TCA_CSUM_UPDATE_FLAG_UDPLITE, "udplite");
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	CSUM_UFLAG_BUFFER(uflag_7, TCA_CSUM_UPDATE_FLAG_SCTP, "sctp");
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	if (!uflag_count) {
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		uflag_1 = "?empty";
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	}
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	print_string(PRINT_ANY, "kind", "%s ", "csum");
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	snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s",
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		 uflag_1, uflag_2, uflag_3,
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		 uflag_4, uflag_5, uflag_6, uflag_7);
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	print_string(PRINT_ANY, "csum", "(%s) ", buf);
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	print_action_control(f, "action ", sel->action, _SL_);
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	print_uint(PRINT_ANY, "index", "\tindex %u", sel->index);
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	print_int(PRINT_ANY, "ref", " ref %d", sel->refcnt);
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	print_int(PRINT_ANY, "bind", " bind %d", sel->bindcnt);
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	if (show_stats) {
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		if (tb[TCA_CSUM_TM]) {
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			struct tcf_t *tm = RTA_DATA(tb[TCA_CSUM_TM]);
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			print_tm(f, tm);
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		}
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	}
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	print_nl();
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	return 0;
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}
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struct action_util csum_action_util = {
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	.id = "csum",
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	.parse_aopt = parse_csum,
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	.print_aopt = print_csum,
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};