blob: 8d3d51e918b0d68c19ac5a436ad2b37ef97603a3 [file] [log] [blame] [edit]
/*
* m_action.c Action Management
*
* This program is free software; you can distribute 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: J Hadi Salim (hadi@cyberus.ca)
*
* TODO:
* - parse to be passed a filedescriptor for logging purposes
*
*/
#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 <dlfcn.h>
#include "utils.h"
#include "tc_common.h"
#include "tc_util.h"
static struct action_util * action_list;
#ifdef ANDROID
extern struct action_util mirred_action_util;
#endif
#ifdef CONFIG_GACT
int gact_ld = 0 ; //fuckin backward compatibility
#endif
int tab_flush = 0;
static void act_usage(void)
{
/*XXX: In the near future add a action->print_help to improve
* usability
* This would mean new tc will not be backward compatible
* with any action .so from the old days. But if someone really
* does that, they would know how to fix this ..
*
*/
fprintf (stderr, "usage: tc actions <ACTSPECOP>*\n");
fprintf(stderr,
"Where: \tACTSPECOP := ACR | GD | FL\n"
"\tACR := add | change | replace <ACTSPEC>* \n"
"\tGD := get | delete | <ACTISPEC>*\n"
"\tFL := ls | list | flush | <ACTNAMESPEC>\n"
"\tACTNAMESPEC := action <ACTNAME>\n"
"\tACTISPEC := <ACTNAMESPEC> <INDEXSPEC>\n"
"\tACTSPEC := action <ACTDETAIL> [INDEXSPEC]\n"
"\tINDEXSPEC := index <32 bit indexvalue>\n"
"\tACTDETAIL := <ACTNAME> <ACTPARAMS>\n"
"\t\tExample ACTNAME is gact, mirred, bpf, etc\n"
"\t\tEach action has its own parameters (ACTPARAMS)\n"
"\n");
exit(-1);
}
static int print_noaopt(struct action_util *au, FILE *f, struct rtattr *opt)
{
if (opt && RTA_PAYLOAD(opt))
fprintf(f, "[Unknown action, optlen=%u] ",
(unsigned) RTA_PAYLOAD(opt));
return 0;
}
static int parse_noaopt(struct action_util *au, int *argc_p, char ***argv_p, int code, struct nlmsghdr *n)
{
int argc = *argc_p;
char **argv = *argv_p;
if (argc) {
fprintf(stderr, "Unknown action \"%s\", hence option \"%s\" is unparsable\n", au->id, *argv);
} else {
fprintf(stderr, "Unknown action \"%s\"\n", au->id);
}
return -1;
}
static struct action_util *get_action_kind(char *str)
{
#ifdef ANDROID
if (!strcmp(str, "mirred")) {
return &mirred_action_util;
} else {
fprintf(stderr, "Android does not support action '%s'", str);
return NULL;
}
#endif
static void *aBODY;
void *dlh;
char buf[256];
struct action_util *a;
#ifdef CONFIG_GACT
int looked4gact = 0;
restart_s:
#endif
for (a = action_list; a; a = a->next) {
if (strcmp(a->id, str) == 0)
return a;
}
snprintf(buf, sizeof(buf), "%s/m_%s.so", get_tc_lib(), str);
dlh = dlopen(buf, RTLD_LAZY | RTLD_GLOBAL);
if (dlh == NULL) {
dlh = aBODY;
if (dlh == NULL) {
dlh = aBODY = dlopen(NULL, RTLD_LAZY);
if (dlh == NULL)
goto noexist;
}
}
snprintf(buf, sizeof(buf), "%s_action_util", str);
a = dlsym(dlh, buf);
if (a == NULL)
goto noexist;
reg:
a->next = action_list;
action_list = a;
return a;
noexist:
#ifdef CONFIG_GACT
if (!looked4gact) {
looked4gact = 1;
strcpy(str,"gact");
goto restart_s;
}
#endif
a = malloc(sizeof(*a));
if (a) {
memset(a, 0, sizeof(*a));
strncpy(a->id, "noact", 15);
a->parse_aopt = parse_noaopt;
a->print_aopt = print_noaopt;
goto reg;
}
return a;
}
static int
new_cmd(char **argv)
{
if ((matches(*argv, "change") == 0) ||
(matches(*argv, "replace") == 0)||
(matches(*argv, "delete") == 0)||
(matches(*argv, "get") == 0)||
(matches(*argv, "add") == 0))
return 1;
return 0;
}
int
parse_action(int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
{
int argc = *argc_p;
char **argv = *argv_p;
struct rtattr *tail, *tail2;
char k[16];
int ok = 0;
int eap = 0; /* expect action parameters */
int ret = 0;
int prio = 0;
if (argc <= 0)
return -1;
tail = tail2 = NLMSG_TAIL(n);
addattr_l(n, MAX_MSG, tca_id, NULL, 0);
while (argc > 0) {
memset(k, 0, sizeof (k));
if (strcmp(*argv, "action") == 0 ) {
argc--;
argv++;
eap = 1;
#ifdef CONFIG_GACT
if (!gact_ld) {
get_action_kind("gact");
}
#endif
continue;
} else if (strcmp(*argv, "flowid") == 0) {
break;
} else if (strcmp(*argv, "classid") == 0) {
break;
} else if (strcmp(*argv, "help") == 0) {
return -1;
} else if (new_cmd(argv)) {
goto done0;
} else {
struct action_util *a = NULL;
strncpy(k, *argv, sizeof (k) - 1);
eap = 0;
if (argc > 0 ) {
a = get_action_kind(k);
} else {
done0:
if (ok)
break;
else
goto done;
}
if (NULL == a) {
goto bad_val;
}
tail = NLMSG_TAIL(n);
addattr_l(n, MAX_MSG, ++prio, NULL, 0);
addattr_l(n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
ret = a->parse_aopt(a,&argc, &argv, TCA_ACT_OPTIONS, n);
if (ret < 0) {
fprintf(stderr,"bad action parsing\n");
goto bad_val;
}
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
ok++;
}
}
if (eap > 0) {
fprintf(stderr,"bad action empty %d\n",eap);
goto bad_val;
}
tail2->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail2;
done:
*argc_p = argc;
*argv_p = argv;
return 0;
bad_val:
/* no need to undo things, returning from here should
* cause enough pain */
fprintf(stderr, "parse_action: bad value (%d:%s)!\n",argc,*argv);
return -1;
}
static int
tc_print_one_action(FILE * f, struct rtattr *arg)
{
struct rtattr *tb[TCA_ACT_MAX + 1];
int err = 0;
struct action_util *a = NULL;
if (arg == NULL)
return -1;
parse_rtattr_nested(tb, TCA_ACT_MAX, arg);
if (tb[TCA_ACT_KIND] == NULL) {
fprintf(stderr, "NULL Action!\n");
return -1;
}
a = get_action_kind(RTA_DATA(tb[TCA_ACT_KIND]));
if (NULL == a)
return err;
err = a->print_aopt(a, f, tb[TCA_ACT_OPTIONS]);
if (0 > err)
return err;
if (show_stats && tb[TCA_ACT_STATS]) {
fprintf(f, "\tAction statistics:\n");
print_tcstats2_attr(f, tb[TCA_ACT_STATS], "\t", NULL);
fprintf(f, "\n");
}
return 0;
}
static int
tc_print_action_flush(FILE *f, const struct rtattr *arg)
{
struct rtattr *tb[TCA_MAX + 1];
int err = 0;
struct action_util *a = NULL;
__u32 *delete_count = 0;
parse_rtattr_nested(tb, TCA_MAX, arg);
if (tb[TCA_KIND] == NULL) {
fprintf(stderr, "NULL Action!\n");
return -1;
}
a = get_action_kind(RTA_DATA(tb[TCA_KIND]));
if (NULL == a)
return err;
delete_count = RTA_DATA(tb[TCA_FCNT]);
fprintf(f," %s (%d entries)\n", a->id, *delete_count);
tab_flush = 0;
return 0;
}
int
tc_print_action(FILE *f, const struct rtattr *arg)
{
int i;
struct rtattr *tb[TCA_ACT_MAX_PRIO + 1];
if (arg == NULL)
return 0;
parse_rtattr_nested(tb, TCA_ACT_MAX_PRIO, arg);
if (tab_flush && NULL != tb[0] && NULL == tb[1])
return tc_print_action_flush(f, tb[0]);
for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
if (tb[i]) {
fprintf(f, "\n\taction order %d: ", i);
if (0 > tc_print_one_action(f, tb[i])) {
fprintf(f, "Error printing action\n");
}
}
}
return 0;
}
int print_action(const struct sockaddr_nl *who,
struct nlmsghdr *n,
void *arg)
{
FILE *fp = (FILE*)arg;
struct tcamsg *t = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr * tb[TCAA_MAX+1];
len -= NLMSG_LENGTH(sizeof(*t));
if (len < 0) {
fprintf(stderr, "Wrong len %d\n", len);
return -1;
}
parse_rtattr(tb, TCAA_MAX, TA_RTA(t), len);
if (NULL == tb[TCA_ACT_TAB]) {
if (n->nlmsg_type != RTM_GETACTION)
fprintf(stderr, "print_action: NULL kind\n");
return -1;
}
if (n->nlmsg_type == RTM_DELACTION) {
if (n->nlmsg_flags & NLM_F_ROOT) {
fprintf(fp, "Flushed table ");
tab_flush = 1;
} else {
fprintf(fp, "deleted action ");
}
}
if (n->nlmsg_type == RTM_NEWACTION)
fprintf(fp, "Added action ");
tc_print_action(fp, tb[TCA_ACT_TAB]);
return 0;
}
static int tc_action_gd(int cmd, unsigned flags, int *argc_p, char ***argv_p)
{
char k[16];
struct action_util *a = NULL;
int argc = *argc_p;
char **argv = *argv_p;
int prio = 0;
int ret = 0;
__u32 i;
struct sockaddr_nl nladdr;
struct rtattr *tail;
struct rtattr *tail2;
struct nlmsghdr *ans = NULL;
struct {
struct nlmsghdr n;
struct tcamsg t;
char buf[MAX_MSG];
} req;
req.t.tca_family = AF_UNSPEC;
memset(&req, 0, sizeof(req));
memset(&nladdr, 0, sizeof(nladdr));
nladdr.nl_family = AF_NETLINK;
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg));
req.n.nlmsg_flags = NLM_F_REQUEST|flags;
req.n.nlmsg_type = cmd;
argc -=1;
argv +=1;
tail = NLMSG_TAIL(&req.n);
addattr_l(&req.n, MAX_MSG, TCA_ACT_TAB, NULL, 0);
while (argc > 0) {
if (strcmp(*argv, "action") == 0 ) {
argc--;
argv++;
continue;
} else if (strcmp(*argv, "help") == 0) {
return -1;
}
strncpy(k, *argv, sizeof (k) - 1);
a = get_action_kind(k);
if (NULL == a) {
fprintf(stderr, "Error: non existent action: %s\n",k);
ret = -1;
goto bad_val;
}
if (strcmp(a->id, k) != 0) {
fprintf(stderr, "Error: non existent action: %s\n",k);
ret = -1;
goto bad_val;
}
argc -=1;
argv +=1;
if (argc <= 0) {
fprintf(stderr, "Error: no index specified action: %s\n",k);
ret = -1;
goto bad_val;
}
if (matches(*argv, "index") == 0) {
NEXT_ARG();
if (get_u32(&i, *argv, 10)) {
fprintf(stderr, "Illegal \"index\"\n");
ret = -1;
goto bad_val;
}
argc -=1;
argv +=1;
} else {
fprintf(stderr, "Error: no index specified action: %s\n",k);
ret = -1;
goto bad_val;
}
tail2 = NLMSG_TAIL(&req.n);
addattr_l(&req.n, MAX_MSG, ++prio, NULL, 0);
addattr_l(&req.n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
addattr32(&req.n, MAX_MSG, TCA_ACT_INDEX, i);
tail2->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail2;
}
tail->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail;
req.n.nlmsg_seq = rth.dump = ++rth.seq;
if (cmd == RTM_GETACTION)
ans = &req.n;
if (rtnl_talk(&rth, &req.n, ans, MAX_MSG) < 0) {
fprintf(stderr, "We have an error talking to the kernel\n");
return 1;
}
if (ans && print_action(NULL, &req.n, (void*)stdout) < 0) {
fprintf(stderr, "Dump terminated\n");
return 1;
}
*argc_p = argc;
*argv_p = argv;
bad_val:
return ret;
}
static int tc_action_modify(int cmd, unsigned flags, int *argc_p, char ***argv_p)
{
int argc = *argc_p;
char **argv = *argv_p;
int ret = 0;
struct rtattr *tail;
struct {
struct nlmsghdr n;
struct tcamsg t;
char buf[MAX_MSG];
} req;
req.t.tca_family = AF_UNSPEC;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg));
req.n.nlmsg_flags = NLM_F_REQUEST|flags;
req.n.nlmsg_type = cmd;
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, char **argv, int event)
{
int ret = 0, prio = 0, msg_size = 0;
char k[16];
struct rtattr *tail,*tail2;
struct action_util *a = NULL;
struct {
struct nlmsghdr n;
struct tcamsg t;
char buf[MAX_MSG];
} req;
req.t.tca_family = AF_UNSPEC;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg));
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 (NULL == a) {
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);
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;
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:
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;
}
return tc_act_list_or_flush(argc-2, argv+2, RTM_GETACTION);
} else if (matches(*argv, "flush") == 0) {
if (argc <= 2) {
act_usage();
return -1;
}
return tc_act_list_or_flush(argc-2, argv+2, RTM_DELACTION);
} else if (matches(*argv, "help") == 0) {
act_usage();
return -1;
} else {
ret = -1;
}
if (ret < 0) {
fprintf(stderr, "Command \"%s\" is unknown, try \"tc actions help\".\n", *argv);
return -1;
}
}
return 0;
}