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      1 /*
      2  * q_fifo.c		FIFO.
      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:	Alexey Kuznetsov, <kuznet (at) ms2.inr.ac.ru>
     10  *
     11  */
     12 
     13 #include <stdio.h>
     14 #include <stdlib.h>
     15 #include <unistd.h>
     16 #include <syslog.h>
     17 #include <fcntl.h>
     18 #include <sys/socket.h>
     19 #include <netinet/in.h>
     20 #include <arpa/inet.h>
     21 #include <string.h>
     22 
     23 #include "utils.h"
     24 #include "tc_util.h"
     25 
     26 static void explain(void)
     27 {
     28 	fprintf(stderr, "Usage: ... [p|b]fifo [ limit NUMBER ]\n");
     29 }
     30 
     31 #define usage() return(-1)
     32 
     33 static int fifo_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
     34 {
     35 	int ok=0;
     36 	struct tc_fifo_qopt opt;
     37 	memset(&opt, 0, sizeof(opt));
     38 
     39 	while (argc > 0) {
     40 		if (strcmp(*argv, "limit") == 0) {
     41 			NEXT_ARG();
     42 			if (get_size(&opt.limit, *argv)) {
     43 				fprintf(stderr, "Illegal \"limit\"\n");
     44 				return -1;
     45 			}
     46 			ok++;
     47 		} else if (strcmp(*argv, "help") == 0) {
     48 			explain();
     49 			return -1;
     50 		} else {
     51 			fprintf(stderr, "What is \"%s\"?\n", *argv);
     52 			explain();
     53 			return -1;
     54 		}
     55 		argc--; argv++;
     56 	}
     57 
     58 	if (ok)
     59 		addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
     60 	return 0;
     61 }
     62 
     63 static int fifo_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
     64 {
     65 	struct tc_fifo_qopt *qopt;
     66 
     67 	if (opt == NULL)
     68 		return 0;
     69 
     70 	if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
     71 		return -1;
     72 	qopt = RTA_DATA(opt);
     73 	if (strcmp(qu->id, "bfifo") == 0) {
     74 		SPRINT_BUF(b1);
     75 		fprintf(f, "limit %s", sprint_size(qopt->limit, b1));
     76 	} else
     77 		fprintf(f, "limit %up", qopt->limit);
     78 	return 0;
     79 }
     80 
     81 
     82 struct qdisc_util bfifo_qdisc_util = {
     83 	.id = "bfifo",
     84 	.parse_qopt = fifo_parse_opt,
     85 	.print_qopt = fifo_print_opt,
     86 };
     87 
     88 struct qdisc_util pfifo_qdisc_util = {
     89 	.id = "pfifo",
     90 	.parse_qopt = fifo_parse_opt,
     91 	.print_qopt = fifo_print_opt,
     92 };
     93 
     94 extern int prio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt);
     95 struct qdisc_util pfifo_fast_qdisc_util = {
     96 	.id = "pfifo_fast",
     97 	.print_qopt = prio_print_opt,
     98 };
     99