| /* |
| * 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; |
| 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; |
| |
| 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 prpriority value"); |
| } else if (matches(*argv, "protocol") == 0) { |
| __u16 id; |
| NEXT_ARG(); |
| if (protocol) |
| duparg("protocol", *argv); |
| if (ll_proto_a2n(&id, *argv)) |
| invarg(*argv, "invalid protocol"); |
| protocol = id; |
| } else if (matches(*argv, "estimator") == 0) { |
| if (parse_estimator(&argc, &argv, &est) < 0) |
| return -1; |
| } else if (matches(*argv, "help") == 0) { |
| usage(); |
| } 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; |
| |
| 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) { |
| __u32 protocol = TC_H_MIN(t->tcm_info); |
| __u32 prio = TC_H_MAJ(t->tcm_info)>>16; |
| if (!filter_protocol || filter_protocol != protocol) { |
| if (protocol) { |
| SPRINT_BUF(b1); |
| fprintf(fp, "protocol %s ", |
| ll_proto_n2a(protocol, 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; |
| } |
| |