/*
* tc_filter.c "tc filter".
*
* 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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <linux/if_ether.h>
#include "rt_names.h"
#include "utils.h"
#include "tc_util.h"
#include "tc_common.h"
static void usage(void);
static void usage(void)
{
fprintf(stderr, "Usage: tc filter [ add | del | change | replace | show ] dev STRING\n");
fprintf(stderr, " [ pref PRIO ] protocol PROTO\n");
fprintf(stderr, " [ estimator INTERVAL TIME_CONSTANT ]\n");
fprintf(stderr, " [ root | classid CLASSID ] [ handle FILTERID ]\n");
fprintf(stderr, " [ [ FILTER_TYPE ] [ help | OPTIONS ] ]\n");
fprintf(stderr, "\n");
fprintf(stderr, " tc filter show [ dev STRING ] [ root | parent CLASSID ]\n");
fprintf(stderr, "Where:\n");
fprintf(stderr, "FILTER_TYPE := { rsvp | u32 | fw | route | etc. }\n");
fprintf(stderr, "FILTERID := ... format depends on classifier, see there\n");
fprintf(stderr, "OPTIONS := ... try tc filter add <desired FILTER_KIND> help\n");
return;
}
int tc_filter_modify(int cmd, unsigned flags, int argc, char **argv)
{
struct {
struct nlmsghdr n;
struct tcmsg t;
char buf[MAX_MSG];
} req;
struct filter_util *q = NULL;
__u32 prio = 0;
__u32 protocol = 0;
int protocol_set = 0;
char *fhandle = NULL;
char d[16];
char k[16];
struct tc_estimator est;
memset(&req, 0, sizeof(req));
memset(&est, 0, sizeof(est));
memset(d, 0, sizeof(d));
memset(k, 0, sizeof(k));
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
req.n.nlmsg_flags = NLM_F_REQUEST|flags;
req.n.nlmsg_type = cmd;
req.t.tcm_family = AF_UNSPEC;
if (cmd == RTM_NEWTFILTER && flags & NLM_F_CREATE)
protocol = ETH_P_ALL;
while (argc > 0) {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
if (d[0])
duparg("dev", *argv);
strncpy(d, *argv, sizeof(d)-1);
} else if (strcmp(*argv, "root") == 0) {
if (req.t.tcm_parent) {
fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
return -1;
}
req.t.tcm_parent = TC_H_ROOT;
} else if (strcmp(*argv, "parent") == 0) {
__u32 handle;
NEXT_ARG();
if (req.t.tcm_parent)
duparg("parent", *argv);
if (get_tc_classid(&handle, *argv))
invarg(*argv, "Invalid parent ID");
req.t.tcm_parent = handle;
} else if (strcmp(*argv, "handle") == 0) {
NEXT_ARG();
if (fhandle)
duparg("handle", *argv);
fhandle = *argv;
} else if (matches(*argv, "preference") == 0 ||
matches(*argv, "priority") == 0) {
NEXT_ARG();
if (prio)
duparg("priority", *argv);
if (get_u32(&prio, *argv, 0))
invarg(*argv, "invalid priority value");
} else if (matches(*argv, "protocol") == 0) {
__u16 id;
NEXT_ARG();
if (protocol_set)
duparg("protocol", *argv);
if (ll_proto_a2n(&id, *argv))
invarg(*argv, "invalid protocol");
protocol = id;
protocol_set = 1;
} else if (matches(*argv, "estimator") == 0) {
if (parse_estimator(&argc, &argv, &est) < 0)
return -1;
} else if (matches(*argv, "help") == 0) {
usage();
return 0;
} else {
strncpy(k, *argv, sizeof(k)-1);
q = get_filter_kind(k);
argc--; argv++;
break;
}
argc--; argv++;
}
req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
if (k[0])
addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
if (q) {
if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
return 1;
} else {
if (fhandle) {
fprintf(stderr, "Must specify filter type when using "
"\"handle\"\n");
return -1;
}
if (argc) {
if (matches(*argv, "help") == 0)
usage();
fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc filter help\".\n", *argv);
return -1;
}
}
if (est.ewma_log)
addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
if (d[0]) {
ll_init_map(&rth);
if ((req.t.tcm_ifindex = ll_name_to_index(d)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", d);
return 1;
}
}
if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
fprintf(stderr, "We have an error talking to the kernel\n");
return 2;
}
return 0;
}
static __u32 filter_parent;
static int filter_ifindex;
static __u32 filter_prio;
static __u32 filter_protocol;
__u16 f_proto = 0;
int print_filter(const struct sockaddr_nl *who,
struct nlmsghdr *n,
void *arg)
{
FILE *fp = (FILE*)arg;
struct tcmsg *t = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr * tb[TCA_MAX+1];
struct filter_util *q;
char abuf[256];
if (n->nlmsg_type != RTM_NEWTFILTER && n->nlmsg_type != RTM_DELTFILTER) {
fprintf(stderr, "Not a filter\n");
return 0;
}
len -= NLMSG_LENGTH(sizeof(*t));
if (len < 0) {
fprintf(stderr, "Wrong len %d\n", len);
return -1;
}
memset(tb, 0, sizeof(tb));
parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
if (tb[TCA_KIND] == NULL) {
fprintf(stderr, "print_filter: NULL kind\n");
return -1;
}
if (n->nlmsg_type == RTM_DELTFILTER)
fprintf(fp, "deleted ");
fprintf(fp, "filter ");
if (!filter_ifindex || filter_ifindex != t->tcm_ifindex)
fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
if (!filter_parent || filter_parent != t->tcm_parent) {
if (t->tcm_parent == TC_H_ROOT)
fprintf(fp, "root ");
else {
print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
fprintf(fp, "parent %s ", abuf);
}
}
if (t->tcm_info) {
f_proto = TC_H_MIN(t->tcm_info);
__u32 prio = TC_H_MAJ(t->tcm_info)>>16;
if (!filter_protocol || filter_protocol != f_proto) {
if (f_proto) {
SPRINT_BUF(b1);
fprintf(fp, "protocol %s ",
ll_proto_n2a(f_proto, b1, sizeof(b1)));
}
}
if (!filter_prio || filter_prio != prio) {
if (prio)
fprintf(fp, "pref %u ", prio);
}
}
fprintf(fp, "%s ", (char*)RTA_DATA(tb[TCA_KIND]));
q = get_filter_kind(RTA_DATA(tb[TCA_KIND]));
if (tb[TCA_OPTIONS]) {
if (q)
q->print_fopt(q, fp, tb[TCA_OPTIONS], t->tcm_handle);
else
fprintf(fp, "[cannot parse parameters]");
}
fprintf(fp, "\n");
if (show_stats && (tb[TCA_STATS] || tb[TCA_STATS2])) {
print_tcstats_attr(fp, tb, " ", NULL);
fprintf(fp, "\n");
}
fflush(fp);
return 0;
}
int tc_filter_list(int argc, char **argv)
{
struct tcmsg t;
char d[16];
__u32 prio = 0;
__u32 protocol = 0;
char *fhandle = NULL;
memset(&t, 0, sizeof(t));
t.tcm_family = AF_UNSPEC;
memset(d, 0, sizeof(d));
while (argc > 0) {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
if (d[0])
duparg("dev", *argv);
strncpy(d, *argv, sizeof(d)-1);
} else if (strcmp(*argv, "root") == 0) {
if (t.tcm_parent) {
fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
return -1;
}
filter_parent = t.tcm_parent = TC_H_ROOT;
} else if (strcmp(*argv, "parent") == 0) {
__u32 handle;
NEXT_ARG();
if (t.tcm_parent)
duparg("parent", *argv);
if (get_tc_classid(&handle, *argv))
invarg(*argv, "invalid parent ID");
filter_parent = t.tcm_parent = handle;
} else if (strcmp(*argv, "handle") == 0) {
NEXT_ARG();
if (fhandle)
duparg("handle", *argv);
fhandle = *argv;
} else if (matches(*argv, "preference") == 0 ||
matches(*argv, "priority") == 0) {
NEXT_ARG();
if (prio)
duparg("priority", *argv);
if (get_u32(&prio, *argv, 0))
invarg(*argv, "invalid preference");
filter_prio = prio;
} else if (matches(*argv, "protocol") == 0) {
__u16 res;
NEXT_ARG();
if (protocol)
duparg("protocol", *argv);
if (ll_proto_a2n(&res, *argv))
invarg(*argv, "invalid protocol");
protocol = res;
filter_protocol = protocol;
} else if (matches(*argv, "help") == 0) {
usage();
} else {
fprintf(stderr, " What is \"%s\"? Try \"tc filter help\"\n", *argv);
return -1;
}
argc--; argv++;
}
t.tcm_info = TC_H_MAKE(prio<<16, protocol);
ll_init_map(&rth);
if (d[0]) {
if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", d);
return 1;
}
filter_ifindex = t.tcm_ifindex;
}
if (rtnl_dump_request(&rth, RTM_GETTFILTER, &t, sizeof(t)) < 0) {
perror("Cannot send dump request");
return 1;
}
if (rtnl_dump_filter(&rth, print_filter, stdout, NULL, NULL) < 0) {
fprintf(stderr, "Dump terminated\n");
return 1;
}
return 0;
}
int do_filter(int argc, char **argv)
{
if (argc < 1)
return tc_filter_list(0, NULL);
if (matches(*argv, "add") == 0)
return tc_filter_modify(RTM_NEWTFILTER, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
if (matches(*argv, "change") == 0)
return tc_filter_modify(RTM_NEWTFILTER, 0, argc-1, argv+1);
if (matches(*argv, "replace") == 0)
return tc_filter_modify(RTM_NEWTFILTER, NLM_F_CREATE, argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return tc_filter_modify(RTM_DELTFILTER, 0, argc-1, argv+1);
#if 0
if (matches(*argv, "get") == 0)
return tc_filter_get(RTM_GETTFILTER, 0, argc-1, argv+1);
#endif
if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
|| matches(*argv, "lst") == 0)
return tc_filter_list(argc-1, argv+1);
if (matches(*argv, "help") == 0) {
usage();
return 0;
}
fprintf(stderr, "Command \"%s\" is unknown, try \"tc filter help\".\n", *argv);
return -1;
}