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726 lines
16 KiB
726 lines
16 KiB
/*
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* m_action.c Action Management
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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: J Hadi Salim (hadi@cyberus.ca)
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*
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* TODO:
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* - parse to be passed a filedescriptor for logging purposes
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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 <dlfcn.h>
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#include "utils.h"
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#include "tc_common.h"
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#include "tc_util.h"
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static struct action_util *action_list;
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#ifdef CONFIG_GACT
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int gact_ld; /* f*ckin backward compatibility */
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#endif
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int tab_flush;
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static void act_usage(void)
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{
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/*XXX: In the near future add a action->print_help to improve
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* usability
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* This would mean new tc will not be backward compatible
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* with any action .so from the old days. But if someone really
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* does that, they would know how to fix this ..
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*
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*/
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fprintf(stderr, "usage: tc actions <ACTSPECOP>*\n");
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fprintf(stderr,
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"Where: \tACTSPECOP := ACR | GD | FL\n"
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"\tACR := add | change | replace <ACTSPEC>*\n"
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"\tGD := get | delete | <ACTISPEC>*\n"
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"\tFL := ls | list | flush | <ACTNAMESPEC>\n"
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"\tACTNAMESPEC := action <ACTNAME>\n"
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"\tACTISPEC := <ACTNAMESPEC> <INDEXSPEC>\n"
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"\tACTSPEC := action <ACTDETAIL> [INDEXSPEC]\n"
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"\tINDEXSPEC := index <32 bit indexvalue>\n"
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"\tACTDETAIL := <ACTNAME> <ACTPARAMS>\n"
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"\t\tExample ACTNAME is gact, mirred, bpf, etc\n"
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"\t\tEach action has its own parameters (ACTPARAMS)\n"
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"\n");
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exit(-1);
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}
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static int print_noaopt(struct action_util *au, FILE *f, struct rtattr *opt)
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{
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if (opt && RTA_PAYLOAD(opt))
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fprintf(f, "[Unknown action, optlen=%u] ",
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(unsigned int) RTA_PAYLOAD(opt));
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return 0;
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}
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static int parse_noaopt(struct action_util *au, int *argc_p, char ***argv_p, int code, struct nlmsghdr *n)
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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) {
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fprintf(stderr, "Unknown action \"%s\", hence option \"%s\" is unparsable\n", au->id, *argv);
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} else {
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fprintf(stderr, "Unknown action \"%s\"\n", au->id);
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}
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return -1;
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}
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static struct action_util *get_action_kind(char *str)
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{
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static void *aBODY;
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void *dlh;
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char buf[256];
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struct action_util *a;
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#ifdef CONFIG_GACT
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int looked4gact = 0;
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restart_s:
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#endif
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for (a = action_list; a; a = a->next) {
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if (strcmp(a->id, str) == 0)
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return a;
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}
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snprintf(buf, sizeof(buf), "%s/m_%s.so", get_tc_lib(), str);
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dlh = dlopen(buf, RTLD_LAZY | RTLD_GLOBAL);
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if (dlh == NULL) {
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dlh = aBODY;
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if (dlh == NULL) {
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dlh = aBODY = dlopen(NULL, RTLD_LAZY);
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if (dlh == NULL)
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goto noexist;
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}
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}
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snprintf(buf, sizeof(buf), "%s_action_util", str);
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a = dlsym(dlh, buf);
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if (a == NULL)
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goto noexist;
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reg:
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a->next = action_list;
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action_list = a;
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return a;
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noexist:
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#ifdef CONFIG_GACT
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if (!looked4gact) {
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looked4gact = 1;
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strcpy(str, "gact");
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goto restart_s;
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}
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#endif
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a = calloc(1, sizeof(*a));
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if (a) {
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strncpy(a->id, "noact", 15);
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a->parse_aopt = parse_noaopt;
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a->print_aopt = print_noaopt;
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goto reg;
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}
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return a;
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}
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static int
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new_cmd(char **argv)
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{
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if ((matches(*argv, "change") == 0) ||
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(matches(*argv, "replace") == 0) ||
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(matches(*argv, "delete") == 0) ||
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(matches(*argv, "get") == 0) ||
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(matches(*argv, "add") == 0))
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return 1;
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return 0;
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}
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int parse_action(int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
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{
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int argc = *argc_p;
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char **argv = *argv_p;
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struct rtattr *tail, *tail2;
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char k[16];
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int act_ck_len = 0;
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int ok = 0;
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int eap = 0; /* expect action parameters */
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int ret = 0;
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int prio = 0;
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unsigned char act_ck[TC_COOKIE_MAX_SIZE];
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if (argc <= 0)
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return -1;
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tail = tail2 = NLMSG_TAIL(n);
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addattr_l(n, MAX_MSG, tca_id, NULL, 0);
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while (argc > 0) {
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memset(k, 0, sizeof(k));
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if (strcmp(*argv, "action") == 0) {
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argc--;
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argv++;
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eap = 1;
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#ifdef CONFIG_GACT
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if (!gact_ld) {
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get_action_kind("gact");
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}
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#endif
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continue;
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} else if (strcmp(*argv, "flowid") == 0) {
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break;
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} else if (strcmp(*argv, "classid") == 0) {
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break;
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} else if (strcmp(*argv, "help") == 0) {
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return -1;
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} else if (new_cmd(argv)) {
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goto done0;
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} else {
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struct action_util *a = NULL;
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strncpy(k, *argv, sizeof(k) - 1);
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eap = 0;
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if (argc > 0) {
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a = get_action_kind(k);
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} else {
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done0:
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if (ok)
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break;
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else
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goto done;
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}
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if (a == NULL) {
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goto bad_val;
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}
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tail = NLMSG_TAIL(n);
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addattr_l(n, MAX_MSG, ++prio, NULL, 0);
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addattr_l(n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
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ret = a->parse_aopt(a, &argc, &argv, TCA_ACT_OPTIONS,
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n);
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if (ret < 0) {
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fprintf(stderr, "bad action parsing\n");
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goto bad_val;
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}
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if (*argv && strcmp(*argv, "cookie") == 0) {
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size_t slen;
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NEXT_ARG();
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slen = strlen(*argv);
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if (slen > TC_COOKIE_MAX_SIZE * 2) {
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char cookie_err_m[128];
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snprintf(cookie_err_m, 128,
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"%zd Max allowed size %d",
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slen, TC_COOKIE_MAX_SIZE*2);
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invarg(cookie_err_m, *argv);
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}
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if (hex2mem(*argv, act_ck, slen / 2) < 0)
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invarg("cookie must be a hex string\n",
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*argv);
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act_ck_len = slen / 2;
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argc--;
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argv++;
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}
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if (act_ck_len)
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addattr_l(n, MAX_MSG, TCA_ACT_COOKIE,
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&act_ck, act_ck_len);
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tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
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ok++;
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}
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}
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if (eap > 0) {
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fprintf(stderr, "bad action empty %d\n", eap);
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goto bad_val;
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}
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tail2->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail2;
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done:
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*argc_p = argc;
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*argv_p = argv;
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return 0;
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bad_val:
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/* no need to undo things, returning from here should
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* cause enough pain */
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fprintf(stderr, "parse_action: bad value (%d:%s)!\n", argc, *argv);
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return -1;
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}
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static int tc_print_one_action(FILE *f, struct rtattr *arg)
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{
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struct rtattr *tb[TCA_ACT_MAX + 1];
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int err = 0;
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struct action_util *a = NULL;
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if (arg == NULL)
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return -1;
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parse_rtattr_nested(tb, TCA_ACT_MAX, arg);
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if (tb[TCA_ACT_KIND] == NULL) {
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fprintf(stderr, "NULL Action!\n");
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return -1;
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}
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a = get_action_kind(RTA_DATA(tb[TCA_ACT_KIND]));
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if (a == NULL)
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return err;
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err = a->print_aopt(a, f, tb[TCA_ACT_OPTIONS]);
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if (err < 0)
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return err;
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if (show_stats && tb[TCA_ACT_STATS]) {
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fprintf(f, "\tAction statistics:\n");
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print_tcstats2_attr(f, tb[TCA_ACT_STATS], "\t", NULL);
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if (tb[TCA_ACT_COOKIE]) {
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int strsz = RTA_PAYLOAD(tb[TCA_ACT_COOKIE]);
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char b1[strsz * 2 + 1];
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fprintf(f, "\n\tcookie len %d %s ", strsz,
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hexstring_n2a(RTA_DATA(tb[TCA_ACT_COOKIE]),
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strsz, b1, sizeof(b1)));
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}
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fprintf(f, "\n");
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}
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return 0;
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}
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static int
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tc_print_action_flush(FILE *f, const struct rtattr *arg)
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{
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struct rtattr *tb[TCA_MAX + 1];
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int err = 0;
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struct action_util *a = NULL;
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__u32 *delete_count = 0;
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parse_rtattr_nested(tb, TCA_MAX, arg);
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if (tb[TCA_KIND] == NULL) {
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fprintf(stderr, "NULL Action!\n");
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return -1;
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}
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a = get_action_kind(RTA_DATA(tb[TCA_KIND]));
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if (a == NULL)
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return err;
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delete_count = RTA_DATA(tb[TCA_FCNT]);
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fprintf(f, " %s (%d entries)\n", a->id, *delete_count);
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tab_flush = 0;
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return 0;
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}
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int
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tc_print_action(FILE *f, const struct rtattr *arg, unsigned short tot_acts)
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{
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int i;
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if (arg == NULL)
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return 0;
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if (!tot_acts)
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tot_acts = TCA_ACT_MAX_PRIO;
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struct rtattr *tb[tot_acts + 1];
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parse_rtattr_nested(tb, tot_acts, arg);
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if (tab_flush && NULL != tb[0] && NULL == tb[1])
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return tc_print_action_flush(f, tb[0]);
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for (i = 0; i < tot_acts; i++) {
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if (tb[i]) {
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fprintf(f, "\n\taction order %d: ", i);
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if (tc_print_one_action(f, tb[i]) < 0) {
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fprintf(f, "Error printing action\n");
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}
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}
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}
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return 0;
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}
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int print_action(const struct sockaddr_nl *who,
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struct nlmsghdr *n,
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void *arg)
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{
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FILE *fp = (FILE *)arg;
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struct tcamsg *t = NLMSG_DATA(n);
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int len = n->nlmsg_len;
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__u32 *tot_acts = NULL;
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struct rtattr *tb[TCA_ROOT_MAX+1];
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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_ROOT_MAX, TA_RTA(t), len);
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if (tb[TCA_ROOT_COUNT])
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tot_acts = RTA_DATA(tb[TCA_ROOT_COUNT]);
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fprintf(fp, "total acts %d\n", tot_acts ? *tot_acts:0);
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if (tb[TCA_ACT_TAB] == NULL) {
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if (n->nlmsg_type != RTM_GETACTION)
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fprintf(stderr, "print_action: NULL kind\n");
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return -1;
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}
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if (n->nlmsg_type == RTM_DELACTION) {
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if (n->nlmsg_flags & NLM_F_ROOT) {
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fprintf(fp, "Flushed table ");
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tab_flush = 1;
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} else {
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fprintf(fp, "Deleted action ");
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}
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}
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if (n->nlmsg_type == RTM_NEWACTION) {
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if ((n->nlmsg_flags & NLM_F_CREATE) &&
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!(n->nlmsg_flags & NLM_F_REPLACE)) {
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fprintf(fp, "Added action ");
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} else if (n->nlmsg_flags & NLM_F_REPLACE) {
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fprintf(fp, "Replaced action ");
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}
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}
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tc_print_action(fp, tb[TCA_ACT_TAB], tot_acts ? *tot_acts:0);
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return 0;
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}
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static int tc_action_gd(int cmd, unsigned int flags, int *argc_p, char ***argv_p)
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{
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char k[16];
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struct action_util *a = NULL;
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int argc = *argc_p;
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char **argv = *argv_p;
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int prio = 0;
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int ret = 0;
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__u32 i = 0;
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struct rtattr *tail;
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struct rtattr *tail2;
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struct nlmsghdr *ans = NULL;
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struct {
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struct nlmsghdr n;
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struct tcamsg 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 tcamsg)),
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.n.nlmsg_flags = NLM_F_REQUEST | flags,
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.n.nlmsg_type = cmd,
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.t.tca_family = AF_UNSPEC,
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};
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argc -= 1;
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argv += 1;
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|
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tail = NLMSG_TAIL(&req.n);
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addattr_l(&req.n, MAX_MSG, TCA_ACT_TAB, NULL, 0);
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while (argc > 0) {
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if (strcmp(*argv, "action") == 0) {
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argc--;
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argv++;
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continue;
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} else if (strcmp(*argv, "help") == 0) {
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return -1;
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}
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strncpy(k, *argv, sizeof(k) - 1);
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a = get_action_kind(k);
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if (a == NULL) {
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fprintf(stderr, "Error: non existent action: %s\n", k);
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ret = -1;
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goto bad_val;
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}
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if (strcmp(a->id, k) != 0) {
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fprintf(stderr, "Error: non existent action: %s\n", k);
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ret = -1;
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goto bad_val;
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}
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argc -= 1;
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argv += 1;
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if (argc <= 0) {
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fprintf(stderr, "Error: no index specified action: %s\n", k);
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ret = -1;
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goto bad_val;
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}
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if (matches(*argv, "index") == 0) {
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NEXT_ARG();
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if (get_u32(&i, *argv, 10)) {
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fprintf(stderr, "Illegal \"index\"\n");
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ret = -1;
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goto bad_val;
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}
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argc -= 1;
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argv += 1;
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} else {
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fprintf(stderr, "Error: no index specified action: %s\n", k);
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ret = -1;
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goto bad_val;
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}
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tail2 = NLMSG_TAIL(&req.n);
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addattr_l(&req.n, MAX_MSG, ++prio, NULL, 0);
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addattr_l(&req.n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
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if (i > 0)
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addattr32(&req.n, MAX_MSG, TCA_ACT_INDEX, i);
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tail2->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail2;
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}
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tail->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail;
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req.n.nlmsg_seq = rth.dump = ++rth.seq;
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if (cmd == RTM_GETACTION)
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ans = &req.n;
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if (rtnl_talk(&rth, &req.n, ans, MAX_MSG) < 0) {
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fprintf(stderr, "We have an error talking to the kernel\n");
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return 1;
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}
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if (ans && print_action(NULL, &req.n, (void *)stdout) < 0) {
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fprintf(stderr, "Dump terminated\n");
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return 1;
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}
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*argc_p = argc;
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*argv_p = argv;
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bad_val:
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|
return ret;
|
|
}
|
|
|
|
static int tc_action_modify(int cmd, unsigned int flags, int *argc_p, char ***argv_p)
|
|
{
|
|
int argc = *argc_p;
|
|
char **argv = *argv_p;
|
|
int ret = 0;
|
|
struct {
|
|
struct nlmsghdr n;
|
|
struct tcamsg t;
|
|
char buf[MAX_MSG];
|
|
} req = {
|
|
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg)),
|
|
.n.nlmsg_flags = NLM_F_REQUEST | flags,
|
|
.n.nlmsg_type = cmd,
|
|
.t.tca_family = AF_UNSPEC,
|
|
};
|
|
struct rtattr *tail = NLMSG_TAIL(&req.n);
|
|
|
|
argc -= 1;
|
|
argv += 1;
|
|
if (parse_action(&argc, &argv, TCA_ACT_TAB, &req.n)) {
|
|
fprintf(stderr, "Illegal \"action\"\n");
|
|
return -1;
|
|
}
|
|
tail->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail;
|
|
|
|
if (rtnl_talk(&rth, &req.n, NULL, 0) < 0) {
|
|
fprintf(stderr, "We have an error talking to the kernel\n");
|
|
ret = -1;
|
|
}
|
|
|
|
*argc_p = argc;
|
|
*argv_p = argv;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tc_act_list_or_flush(int *argc_p, char ***argv_p, int event)
|
|
{
|
|
struct rtattr *tail, *tail2, *tail3, *tail4;
|
|
int ret = 0, prio = 0, msg_size = 0;
|
|
struct action_util *a = NULL;
|
|
struct nla_bitfield32 flag_select = { 0 };
|
|
char **argv = *argv_p;
|
|
__u32 msec_since = 0;
|
|
int argc = *argc_p;
|
|
char k[16];
|
|
struct {
|
|
struct nlmsghdr n;
|
|
struct tcamsg t;
|
|
char buf[MAX_MSG];
|
|
} req = {
|
|
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg)),
|
|
.t.tca_family = AF_UNSPEC,
|
|
};
|
|
|
|
tail = NLMSG_TAIL(&req.n);
|
|
addattr_l(&req.n, MAX_MSG, TCA_ACT_TAB, NULL, 0);
|
|
tail2 = NLMSG_TAIL(&req.n);
|
|
|
|
strncpy(k, *argv, sizeof(k) - 1);
|
|
#ifdef CONFIG_GACT
|
|
if (!gact_ld) {
|
|
get_action_kind("gact");
|
|
}
|
|
#endif
|
|
a = get_action_kind(k);
|
|
if (a == NULL) {
|
|
fprintf(stderr, "bad action %s\n", k);
|
|
goto bad_val;
|
|
}
|
|
if (strcmp(a->id, k) != 0) {
|
|
fprintf(stderr, "bad action %s\n", k);
|
|
goto bad_val;
|
|
}
|
|
strncpy(k, *argv, sizeof(k) - 1);
|
|
|
|
argc -= 1;
|
|
argv += 1;
|
|
|
|
if (argc && (strcmp(*argv, "since") == 0)) {
|
|
NEXT_ARG();
|
|
if (get_u32(&msec_since, *argv, 0))
|
|
invarg("dump time \"since\" is invalid", *argv);
|
|
}
|
|
|
|
addattr_l(&req.n, MAX_MSG, ++prio, NULL, 0);
|
|
addattr_l(&req.n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
|
|
tail2->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail2;
|
|
tail->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail;
|
|
|
|
tail3 = NLMSG_TAIL(&req.n);
|
|
flag_select.value |= TCA_FLAG_LARGE_DUMP_ON;
|
|
flag_select.selector |= TCA_FLAG_LARGE_DUMP_ON;
|
|
addattr_l(&req.n, MAX_MSG, TCA_ROOT_FLAGS, &flag_select,
|
|
sizeof(struct nla_bitfield32));
|
|
tail3->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail3;
|
|
if (msec_since) {
|
|
tail4 = NLMSG_TAIL(&req.n);
|
|
addattr32(&req.n, MAX_MSG, TCA_ROOT_TIME_DELTA, msec_since);
|
|
tail4->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail4;
|
|
}
|
|
msg_size = NLMSG_ALIGN(req.n.nlmsg_len) - NLMSG_ALIGN(sizeof(struct nlmsghdr));
|
|
|
|
if (event == RTM_GETACTION) {
|
|
if (rtnl_dump_request(&rth, event, (void *)&req.t, msg_size) < 0) {
|
|
perror("Cannot send dump request");
|
|
return 1;
|
|
}
|
|
ret = rtnl_dump_filter(&rth, print_action, stdout);
|
|
}
|
|
|
|
if (event == RTM_DELACTION) {
|
|
req.n.nlmsg_len = NLMSG_ALIGN(req.n.nlmsg_len);
|
|
req.n.nlmsg_type = RTM_DELACTION;
|
|
req.n.nlmsg_flags |= NLM_F_ROOT;
|
|
req.n.nlmsg_flags |= NLM_F_REQUEST;
|
|
if (rtnl_talk(&rth, &req.n, NULL, 0) < 0) {
|
|
fprintf(stderr, "We have an error flushing\n");
|
|
return 1;
|
|
}
|
|
|
|
}
|
|
|
|
bad_val:
|
|
|
|
*argc_p = argc;
|
|
*argv_p = argv;
|
|
return ret;
|
|
}
|
|
|
|
int do_action(int argc, char **argv)
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
while (argc > 0) {
|
|
|
|
if (matches(*argv, "add") == 0) {
|
|
ret = tc_action_modify(RTM_NEWACTION, NLM_F_EXCL|NLM_F_CREATE, &argc, &argv);
|
|
} else if (matches(*argv, "change") == 0 ||
|
|
matches(*argv, "replace") == 0) {
|
|
ret = tc_action_modify(RTM_NEWACTION, NLM_F_CREATE|NLM_F_REPLACE, &argc, &argv);
|
|
} else if (matches(*argv, "delete") == 0) {
|
|
argc -= 1;
|
|
argv += 1;
|
|
ret = tc_action_gd(RTM_DELACTION, 0, &argc, &argv);
|
|
} else if (matches(*argv, "get") == 0) {
|
|
argc -= 1;
|
|
argv += 1;
|
|
ret = tc_action_gd(RTM_GETACTION, 0, &argc, &argv);
|
|
} else if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
|
|
|| matches(*argv, "lst") == 0) {
|
|
if (argc <= 2) {
|
|
act_usage();
|
|
return -1;
|
|
}
|
|
|
|
argc -= 2;
|
|
argv += 2;
|
|
return tc_act_list_or_flush(&argc, &argv,
|
|
RTM_GETACTION);
|
|
} else if (matches(*argv, "flush") == 0) {
|
|
if (argc <= 2) {
|
|
act_usage();
|
|
return -1;
|
|
}
|
|
|
|
argc -= 2;
|
|
argv += 2;
|
|
return tc_act_list_or_flush(&argc, &argv,
|
|
RTM_DELACTION);
|
|
} else if (matches(*argv, "help") == 0) {
|
|
act_usage();
|
|
return -1;
|
|
} else {
|
|
fprintf(stderr, "Command \"%s\" is unknown, try \"tc actions help\".\n", *argv);
|
|
return -1;
|
|
}
|
|
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|