/*
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* tc_filter.c "tc filter".
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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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <linux/if_ether.h>
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#include "rt_names.h"
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#include "utils.h"
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#include "tc_util.h"
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#include "tc_common.h"
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static void usage(void)
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{
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fprintf(stderr,
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"Usage: tc filter [ add | del | change | replace | show ] dev STRING\n"
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"Usage: tc filter get dev STRING parent CLASSID protocol PROTO handle FILTERID pref PRIO FILTER_TYPE\n"
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" [ pref PRIO ] protocol PROTO [ chain CHAIN_INDEX ]\n"
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" [ estimator INTERVAL TIME_CONSTANT ]\n"
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" [ root | ingress | egress | parent CLASSID ]\n"
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" [ handle FILTERID ] [ [ FILTER_TYPE ] [ help | OPTIONS ] ]\n"
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"\n"
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" tc filter show [ dev STRING ] [ root | ingress | egress | parent CLASSID ]\n"
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"Where:\n"
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"FILTER_TYPE := { rsvp | u32 | bpf | fw | route | etc. }\n"
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"FILTERID := ... format depends on classifier, see there\n"
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"OPTIONS := ... try tc filter add <desired FILTER_KIND> help\n");
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}
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static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
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{
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struct {
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struct nlmsghdr n;
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struct tcmsg t;
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char buf[MAX_MSG];
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} req = {
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.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
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.n.nlmsg_flags = NLM_F_REQUEST | flags,
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.n.nlmsg_type = cmd,
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.t.tcm_family = AF_UNSPEC,
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};
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struct filter_util *q = NULL;
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__u32 prio = 0;
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__u32 protocol = 0;
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int protocol_set = 0;
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__u32 chain_index;
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int chain_index_set = 0;
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char *fhandle = NULL;
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char d[16] = {};
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char k[16] = {};
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struct tc_estimator est = {};
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if (cmd == RTM_NEWTFILTER && flags & NLM_F_CREATE)
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protocol = htons(ETH_P_ALL);
|
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while (argc > 0) {
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if (strcmp(*argv, "dev") == 0) {
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NEXT_ARG();
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if (d[0])
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duparg("dev", *argv);
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strncpy(d, *argv, sizeof(d)-1);
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} else if (strcmp(*argv, "root") == 0) {
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if (req.t.tcm_parent) {
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fprintf(stderr,
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"Error: \"root\" is duplicate parent ID\n");
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return -1;
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}
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req.t.tcm_parent = TC_H_ROOT;
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} else if (strcmp(*argv, "ingress") == 0) {
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if (req.t.tcm_parent) {
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fprintf(stderr,
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"Error: \"ingress\" is duplicate parent ID\n");
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return -1;
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}
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req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
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TC_H_MIN_INGRESS);
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} else if (strcmp(*argv, "egress") == 0) {
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if (req.t.tcm_parent) {
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fprintf(stderr,
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"Error: \"egress\" is duplicate parent ID\n");
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return -1;
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}
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req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
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TC_H_MIN_EGRESS);
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} else if (strcmp(*argv, "parent") == 0) {
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__u32 handle;
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NEXT_ARG();
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if (req.t.tcm_parent)
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duparg("parent", *argv);
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if (get_tc_classid(&handle, *argv))
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invarg("Invalid parent ID", *argv);
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req.t.tcm_parent = handle;
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} else if (strcmp(*argv, "handle") == 0) {
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NEXT_ARG();
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if (fhandle)
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duparg("handle", *argv);
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fhandle = *argv;
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} else if (matches(*argv, "preference") == 0 ||
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matches(*argv, "priority") == 0) {
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NEXT_ARG();
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if (prio)
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duparg("priority", *argv);
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if (get_u32(&prio, *argv, 0) || prio > 0xFFFF)
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invarg("invalid priority value", *argv);
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} else if (matches(*argv, "protocol") == 0) {
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__u16 id;
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NEXT_ARG();
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if (protocol_set)
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duparg("protocol", *argv);
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if (ll_proto_a2n(&id, *argv))
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invarg("invalid protocol", *argv);
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protocol = id;
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protocol_set = 1;
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} else if (matches(*argv, "chain") == 0) {
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NEXT_ARG();
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if (chain_index_set)
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duparg("chain", *argv);
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if (get_u32(&chain_index, *argv, 0))
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invarg("invalid chain index value", *argv);
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chain_index_set = 1;
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} else if (matches(*argv, "estimator") == 0) {
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if (parse_estimator(&argc, &argv, &est) < 0)
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return -1;
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} else if (matches(*argv, "help") == 0) {
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usage();
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return 0;
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} else {
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strncpy(k, *argv, sizeof(k)-1);
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q = get_filter_kind(k);
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argc--; argv++;
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break;
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}
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argc--; argv++;
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}
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req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
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if (chain_index_set)
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addattr32(&req.n, sizeof(req), TCA_CHAIN, chain_index);
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if (k[0])
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addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
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if (q) {
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if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
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return 1;
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} else {
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if (fhandle) {
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fprintf(stderr,
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"Must specify filter type when using \"handle\"\n");
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return -1;
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}
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if (argc) {
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if (matches(*argv, "help") == 0)
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usage();
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fprintf(stderr,
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"Garbage instead of arguments \"%s ...\". Try \"tc filter help\".\n",
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*argv);
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return -1;
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}
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}
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if (est.ewma_log)
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addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
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|
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if (d[0]) {
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ll_init_map(&rth);
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req.t.tcm_ifindex = ll_name_to_index(d);
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if (req.t.tcm_ifindex == 0) {
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fprintf(stderr, "Cannot find device \"%s\"\n", d);
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return 1;
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}
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}
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if (rtnl_talk(&rth, &req.n, NULL, 0) < 0) {
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fprintf(stderr, "We have an error talking to the kernel\n");
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return 2;
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}
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return 0;
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}
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static __u32 filter_parent;
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static int filter_ifindex;
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static __u32 filter_prio;
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static __u32 filter_protocol;
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static __u32 filter_chain_index;
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static int filter_chain_index_set;
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__u16 f_proto;
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int print_filter(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
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{
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FILE *fp = (FILE *)arg;
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struct tcmsg *t = NLMSG_DATA(n);
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int len = n->nlmsg_len;
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struct rtattr *tb[TCA_MAX+1];
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struct filter_util *q;
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char abuf[256];
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if (n->nlmsg_type != RTM_NEWTFILTER &&
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n->nlmsg_type != RTM_GETTFILTER &&
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n->nlmsg_type != RTM_DELTFILTER) {
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fprintf(stderr, "Not a filter(cmd %d)\n", n->nlmsg_type);
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return 0;
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}
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len -= NLMSG_LENGTH(sizeof(*t));
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if (len < 0) {
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fprintf(stderr, "Wrong len %d\n", len);
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return -1;
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}
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parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
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if (tb[TCA_KIND] == NULL) {
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fprintf(stderr, "print_filter: NULL kind\n");
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return -1;
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}
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if (n->nlmsg_type == RTM_DELTFILTER)
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fprintf(fp, "deleted ");
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if (n->nlmsg_type == RTM_NEWTFILTER &&
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(n->nlmsg_flags & NLM_F_CREATE) &&
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!(n->nlmsg_flags & NLM_F_EXCL))
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fprintf(fp, "replaced ");
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if (n->nlmsg_type == RTM_NEWTFILTER &&
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(n->nlmsg_flags & NLM_F_CREATE) &&
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(n->nlmsg_flags & NLM_F_EXCL))
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fprintf(fp, "added ");
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fprintf(fp, "filter ");
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if (!filter_ifindex || filter_ifindex != t->tcm_ifindex)
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fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
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if (!filter_parent || filter_parent != t->tcm_parent) {
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if (t->tcm_parent == TC_H_ROOT)
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fprintf(fp, "root ");
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else if (t->tcm_parent == TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS))
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fprintf(fp, "ingress ");
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else if (t->tcm_parent == TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_EGRESS))
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fprintf(fp, "egress ");
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else {
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print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
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fprintf(fp, "parent %s ", abuf);
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}
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}
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if (t->tcm_info) {
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f_proto = TC_H_MIN(t->tcm_info);
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__u32 prio = TC_H_MAJ(t->tcm_info)>>16;
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if (!filter_protocol || filter_protocol != f_proto) {
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if (f_proto) {
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SPRINT_BUF(b1);
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fprintf(fp, "protocol %s ",
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ll_proto_n2a(f_proto, b1, sizeof(b1)));
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}
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}
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if (!filter_prio || filter_prio != prio) {
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if (prio)
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fprintf(fp, "pref %u ", prio);
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}
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}
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fprintf(fp, "%s ", rta_getattr_str(tb[TCA_KIND]));
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if (tb[TCA_CHAIN]) {
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__u32 chain_index = rta_getattr_u32(tb[TCA_CHAIN]);
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if (!filter_chain_index_set ||
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filter_chain_index != chain_index)
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fprintf(fp, "chain %u ", chain_index);
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}
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q = get_filter_kind(RTA_DATA(tb[TCA_KIND]));
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if (tb[TCA_OPTIONS]) {
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if (q)
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q->print_fopt(q, fp, tb[TCA_OPTIONS], t->tcm_handle);
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else
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fprintf(fp, "[cannot parse parameters]");
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}
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fprintf(fp, "\n");
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if (show_stats && (tb[TCA_STATS] || tb[TCA_STATS2])) {
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print_tcstats_attr(fp, tb, " ", NULL);
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fprintf(fp, "\n");
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}
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fflush(fp);
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return 0;
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}
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static int tc_filter_get(int cmd, unsigned int flags, int argc, char **argv)
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{
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struct {
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struct nlmsghdr n;
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struct tcmsg t;
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char buf[MAX_MSG];
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} req = {
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.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
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/* NLM_F_ECHO is for backward compatibility. old kernels never
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* respond without it and newer kernels will ignore it.
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* In old kernels there is a side effect:
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* In addition to a response to the GET you will receive an
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* event (if you do tc mon).
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*/
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.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ECHO | flags,
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.n.nlmsg_type = cmd,
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.t.tcm_parent = TC_H_UNSPEC,
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.t.tcm_family = AF_UNSPEC,
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};
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struct filter_util *q = NULL;
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__u32 prio = 0;
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__u32 protocol = 0;
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int protocol_set = 0;
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__u32 chain_index;
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int chain_index_set = 0;
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__u32 parent_handle = 0;
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char *fhandle = NULL;
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char d[16] = {};
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char k[16] = {};
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while (argc > 0) {
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if (strcmp(*argv, "dev") == 0) {
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NEXT_ARG();
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if (d[0])
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duparg("dev", *argv);
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strncpy(d, *argv, sizeof(d)-1);
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} else if (strcmp(*argv, "root") == 0) {
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if (req.t.tcm_parent) {
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fprintf(stderr,
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"Error: \"root\" is duplicate parent ID\n");
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return -1;
|
}
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req.t.tcm_parent = TC_H_ROOT;
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} else if (strcmp(*argv, "ingress") == 0) {
|
if (req.t.tcm_parent) {
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fprintf(stderr,
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"Error: \"ingress\" is duplicate parent ID\n");
|
return -1;
|
}
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req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
|
TC_H_MIN_INGRESS);
|
} else if (strcmp(*argv, "egress") == 0) {
|
if (req.t.tcm_parent) {
|
fprintf(stderr,
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"Error: \"egress\" is duplicate parent ID\n");
|
return -1;
|
}
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req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
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TC_H_MIN_EGRESS);
|
} else if (strcmp(*argv, "parent") == 0) {
|
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NEXT_ARG();
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if (req.t.tcm_parent)
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duparg("parent", *argv);
|
if (get_tc_classid(&parent_handle, *argv))
|
invarg("Invalid parent ID", *argv);
|
req.t.tcm_parent = parent_handle;
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} else if (strcmp(*argv, "handle") == 0) {
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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) || prio > 0xFFFF)
|
invarg("invalid priority value", *argv);
|
} else if (matches(*argv, "protocol") == 0) {
|
__u16 id;
|
|
NEXT_ARG();
|
if (protocol_set)
|
duparg("protocol", *argv);
|
if (ll_proto_a2n(&id, *argv))
|
invarg("invalid protocol", *argv);
|
protocol = id;
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protocol_set = 1;
|
} else if (matches(*argv, "chain") == 0) {
|
NEXT_ARG();
|
if (chain_index_set)
|
duparg("chain", *argv);
|
if (get_u32(&chain_index, *argv, 0))
|
invarg("invalid chain index value", *argv);
|
chain_index_set = 1;
|
} else if (matches(*argv, "help") == 0) {
|
usage();
|
return 0;
|
} else {
|
if (!**argv)
|
invarg("invalid filter name", *argv);
|
|
strncpy(k, *argv, sizeof(k)-1);
|
|
q = get_filter_kind(k);
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argc--; argv++;
|
break;
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}
|
|
argc--; argv++;
|
}
|
|
if (!protocol_set) {
|
fprintf(stderr, "Must specify filter protocol\n");
|
return -1;
|
}
|
|
if (!prio) {
|
fprintf(stderr, "Must specify filter priority\n");
|
return -1;
|
}
|
|
req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
|
|
if (chain_index_set)
|
addattr32(&req.n, sizeof(req), TCA_CHAIN, chain_index);
|
|
if (req.t.tcm_parent == TC_H_UNSPEC) {
|
fprintf(stderr, "Must specify filter parent\n");
|
return -1;
|
}
|
|
if (k[0])
|
addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
|
else {
|
fprintf(stderr, "Must specify filter type\n");
|
return -1;
|
}
|
|
if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
|
return 1;
|
|
|
if (!fhandle) {
|
fprintf(stderr, "Must specify filter \"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 (d[0]) {
|
ll_init_map(&rth);
|
|
req.t.tcm_ifindex = ll_name_to_index(d);
|
if (req.t.tcm_ifindex == 0) {
|
fprintf(stderr, "Cannot find device \"%s\"\n", d);
|
return 1;
|
}
|
filter_ifindex = req.t.tcm_ifindex;
|
} else {
|
fprintf(stderr, "Must specify netdevice \"dev\"\n");
|
return -1;
|
}
|
|
if (rtnl_talk(&rth, &req.n, &req.n, MAX_MSG) < 0) {
|
fprintf(stderr, "We have an error talking to the kernel\n");
|
return 2;
|
}
|
|
print_filter(NULL, &req.n, (void *)stdout);
|
|
return 0;
|
}
|
|
static int tc_filter_list(int argc, char **argv)
|
{
|
struct {
|
struct nlmsghdr n;
|
struct tcmsg t;
|
char buf[MAX_MSG];
|
} req = {
|
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
|
.n.nlmsg_type = RTM_GETTFILTER,
|
.t.tcm_parent = TC_H_UNSPEC,
|
.t.tcm_family = AF_UNSPEC,
|
};
|
char d[16] = {};
|
__u32 prio = 0;
|
__u32 protocol = 0;
|
__u32 chain_index;
|
char *fhandle = NULL;
|
|
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;
|
}
|
filter_parent = req.t.tcm_parent = TC_H_ROOT;
|
} else if (strcmp(*argv, "ingress") == 0) {
|
if (req.t.tcm_parent) {
|
fprintf(stderr,
|
"Error: \"ingress\" is duplicate parent ID\n");
|
return -1;
|
}
|
filter_parent = TC_H_MAKE(TC_H_CLSACT,
|
TC_H_MIN_INGRESS);
|
req.t.tcm_parent = filter_parent;
|
} else if (strcmp(*argv, "egress") == 0) {
|
if (req.t.tcm_parent) {
|
fprintf(stderr,
|
"Error: \"egress\" is duplicate parent ID\n");
|
return -1;
|
}
|
filter_parent = TC_H_MAKE(TC_H_CLSACT,
|
TC_H_MIN_EGRESS);
|
req.t.tcm_parent = filter_parent;
|
} 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("invalid parent ID", *argv);
|
filter_parent = 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("invalid preference", *argv);
|
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("invalid protocol", *argv);
|
protocol = res;
|
filter_protocol = protocol;
|
} else if (matches(*argv, "chain") == 0) {
|
NEXT_ARG();
|
if (filter_chain_index_set)
|
duparg("chain", *argv);
|
if (get_u32(&chain_index, *argv, 0))
|
invarg("invalid chain index value", *argv);
|
filter_chain_index_set = 1;
|
filter_chain_index = chain_index;
|
} else if (matches(*argv, "help") == 0) {
|
usage();
|
} else {
|
fprintf(stderr,
|
" What is \"%s\"? Try \"tc filter help\"\n",
|
*argv);
|
return -1;
|
}
|
|
argc--; argv++;
|
}
|
|
req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
|
|
ll_init_map(&rth);
|
|
if (d[0]) {
|
req.t.tcm_ifindex = ll_name_to_index(d);
|
if (req.t.tcm_ifindex == 0) {
|
fprintf(stderr, "Cannot find device \"%s\"\n", d);
|
return 1;
|
}
|
filter_ifindex = req.t.tcm_ifindex;
|
}
|
|
if (filter_chain_index_set)
|
addattr32(&req.n, sizeof(req), TCA_CHAIN, chain_index);
|
|
if (rtnl_dump_request_n(&rth, &req.n) < 0) {
|
perror("Cannot send dump request");
|
return 1;
|
}
|
|
if (rtnl_dump_filter(&rth, print_filter, stdout) < 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 (matches(*argv, "get") == 0)
|
return tc_filter_get(RTM_GETTFILTER, 0, argc-1, argv+1);
|
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;
|
}
|
