/*
* m_egress.c ingress/egress packet mirror/redir actions module
*
* 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: Add Ingress support
*
*/
#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 "utils.h"
#include "tc_util.h"
#include "tc_common.h"
#include <linux/tc_act/tc_mirred.h>
static void
explain(void)
{
fprintf(stderr, "Usage: mirred <DIRECTION> <ACTION> [index INDEX] <dev DEVICENAME> \n");
fprintf(stderr, "where: \n");
fprintf(stderr, "\tDIRECTION := <ingress | egress>\n");
fprintf(stderr, "\tACTION := <mirror | redirect>\n");
fprintf(stderr, "\tINDEX is the specific policy instance id\n");
fprintf(stderr, "\tDEVICENAME is the devicename \n");
}
static void
usage(void)
{
explain();
exit(-1);
}
static const char *mirred_n2a(int action)
{
switch (action) {
case TCA_EGRESS_REDIR:
return "Egress Redirect";
case TCA_INGRESS_REDIR:
return "Ingress Redirect";
case TCA_EGRESS_MIRROR:
return "Egress Mirror";
case TCA_INGRESS_MIRROR:
return "Ingress Mirror";
default:
return "unknown";
}
}
static int
parse_egress(struct action_util *a, int *argc_p, char ***argv_p,
int tca_id, struct nlmsghdr *n)
{
int argc = *argc_p;
char **argv = *argv_p;
int ok = 0, iok = 0, mirror=0,redir=0;
struct tc_mirred p;
struct rtattr *tail;
char d[16];
memset(d,0,sizeof(d)-1);
memset(&p,0,sizeof(struct tc_mirred));
while (argc > 0) {
if (matches(*argv, "action") == 0) {
break;
} else if (matches(*argv, "egress") == 0) {
NEXT_ARG();
ok++;
continue;
} else {
if (matches(*argv, "index") == 0) {
NEXT_ARG();
if (get_u32(&p.index, *argv, 10)) {
fprintf(stderr, "Illegal \"index\"\n");
return -1;
}
iok++;
if (!ok) {
argc--;
argv++;
break;
}
} else if(!ok) {
fprintf(stderr, "was expecting egress (%s)\n", *argv);
break;
} else if (!mirror && matches(*argv, "mirror") == 0) {
mirror=1;
if (redir) {
fprintf(stderr, "Can't have both mirror and redir\n");
return -1;
}
p.eaction = TCA_EGRESS_MIRROR;
p.action = TC_ACT_PIPE;
ok++;
} else if (!redir && matches(*argv, "redirect") == 0) {
redir=1;
if (mirror) {
fprintf(stderr, "Can't have both mirror and redir\n");
return -1;
}
p.eaction = TCA_EGRESS_REDIR;
p.action = TC_ACT_STOLEN;
ok++;
} else if ((redir || mirror) && matches(*argv, "dev") == 0) {
NEXT_ARG();
if (strlen(d))
duparg("dev", *argv);
strncpy(d, *argv, sizeof(d)-1);
argc--;
argv++;
break;
}
}
NEXT_ARG();
}
if (!ok && !iok) {
return -1;
}
if (d[0]) {
int idx;
ll_init_map(&rth);
if ((idx = ll_name_to_index(d)) == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", d);
return -1;
}
p.ifindex = idx;
}
if (argc && p.eaction == TCA_EGRESS_MIRROR) {
if (matches(*argv, "reclassify") == 0) {
p.action = TC_POLICE_RECLASSIFY;
NEXT_ARG();
} else if (matches(*argv, "pipe") == 0) {
p.action = TC_POLICE_PIPE;
NEXT_ARG();
} else if (matches(*argv, "drop") == 0 ||
matches(*argv, "shot") == 0) {
p.action = TC_POLICE_SHOT;
NEXT_ARG();
} else if (matches(*argv, "continue") == 0) {
p.action = TC_POLICE_UNSPEC;
NEXT_ARG();
} else if (matches(*argv, "pass") == 0) {
p.action = TC_POLICE_OK;
NEXT_ARG();
}
}
if (argc) {
if (iok && matches(*argv, "index") == 0) {
fprintf(stderr, "mirred: Illegal double index\n");
return -1;
} else {
if (matches(*argv, "index") == 0) {
NEXT_ARG();
if (get_u32(&p.index, *argv, 10)) {
fprintf(stderr, "mirred: Illegal \"index\"\n");
return -1;
}
argc--;
argv++;
}
}
}
tail = NLMSG_TAIL(n);
addattr_l(n, MAX_MSG, tca_id, NULL, 0);
addattr_l(n, MAX_MSG, TCA_MIRRED_PARMS, &p, sizeof (p));
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
*argc_p = argc;
*argv_p = argv;
return 0;
}
static int
parse_mirred(struct action_util *a, int *argc_p, char ***argv_p,
int tca_id, struct nlmsghdr *n)
{
int argc = *argc_p;
char **argv = *argv_p;
if (argc < 0) {
fprintf(stderr,"mirred bad argument count %d\n", argc);
return -1;
}
if (matches(*argv, "mirred") == 0) {
NEXT_ARG();
} else {
fprintf(stderr,"mirred bad argument %s\n", *argv);
return -1;
}
if (matches(*argv, "egress") == 0 || matches(*argv, "index") == 0) {
int ret = parse_egress(a, &argc, &argv, tca_id, n);
if (ret == 0) {
*argc_p = argc;
*argv_p = argv;
return 0;
}
} else if (matches(*argv, "ingress") == 0) {
fprintf(stderr,"mirred ingress not supported at the moment\n");
} else if (matches(*argv, "help") == 0) {
usage();
} else {
fprintf(stderr,"mirred option not supported %s\n", *argv);
}
return -1;
}
static int
print_mirred(struct action_util *au,FILE * f, struct rtattr *arg)
{
struct tc_mirred *p;
struct rtattr *tb[TCA_MIRRED_MAX + 1];
const char *dev;
SPRINT_BUF(b1);
if (arg == NULL)
return -1;
parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
if (tb[TCA_MIRRED_PARMS] == NULL) {
fprintf(f, "[NULL mirred parameters]");
return -1;
}
p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
/*
ll_init_map(&rth);
*/
if ((dev = ll_index_to_name(p->ifindex)) == 0) {
fprintf(stderr, "Cannot find device %d\n", p->ifindex);
return -1;
}
fprintf(f, "mirred (%s to device %s) %s", mirred_n2a(p->eaction), dev,action_n2a(p->action, b1, sizeof (b1)));
fprintf(f, "\n ");
fprintf(f, "\tindex %d ref %d bind %d",p->index,p->refcnt,p->bindcnt);
if (show_stats) {
if (tb[TCA_MIRRED_TM]) {
struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
print_tm(f,tm);
}
}
fprintf(f, "\n ");
return 0;
}
struct action_util mirred_action_util = {
.id = "mirred",
.parse_aopt = parse_mirred,
.print_aopt = print_mirred,
};