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-rw-r--r--tc/m_mirred.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/tc/m_mirred.c b/tc/m_mirred.c
new file mode 100644
index 0000000..e5653e6
--- /dev/null
+++ b/tc/m_mirred.c
@@ -0,0 +1,325 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * m_egress.c ingress/egress packet mirror/redir actions module
+ *
+ * Authors: J Hadi Salim (hadi@cyberus.ca)
+ *
+ * TODO: Add Ingress support
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.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"
+ "where:\n"
+ "\tDIRECTION := <ingress | egress>\n"
+ "\tACTION := <mirror | redirect>\n"
+ "\tINDEX is the specific policy instance id\n"
+ "\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 const char *mirred_direction(int action)
+{
+ switch (action) {
+ case TCA_EGRESS_REDIR:
+ case TCA_EGRESS_MIRROR:
+ return "egress";
+ case TCA_INGRESS_REDIR:
+ case TCA_INGRESS_MIRROR:
+ return "ingress";
+ default:
+ return "unknown";
+ }
+}
+
+static const char *mirred_action(int action)
+{
+ switch (action) {
+ case TCA_EGRESS_REDIR:
+ case TCA_INGRESS_REDIR:
+ return "redirect";
+ case TCA_EGRESS_MIRROR:
+ case TCA_INGRESS_MIRROR:
+ return "mirror";
+ default:
+ return "unknown";
+ }
+}
+
+static int
+parse_direction(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, ingress = 0, egress = 0;
+ struct tc_mirred p = {};
+ struct rtattr *tail;
+ char d[IFNAMSIZ] = {};
+
+ while (argc > 0) {
+
+ if (matches(*argv, "action") == 0) {
+ NEXT_ARG();
+ break;
+ } else if (!egress && matches(*argv, "egress") == 0) {
+ egress = 1;
+ if (ingress) {
+ fprintf(stderr,
+ "Can't have both egress and ingress\n");
+ return -1;
+ }
+ NEXT_ARG();
+ ok++;
+ continue;
+ } else if (!ingress && matches(*argv, "ingress") == 0) {
+ ingress = 1;
+ if (egress) {
+ fprintf(stderr,
+ "Can't have both ingress and egress\n");
+ return -1;
+ }
+ 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 or ingress (%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 = egress ? TCA_EGRESS_MIRROR :
+ TCA_INGRESS_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 = egress ? TCA_EGRESS_REDIR :
+ TCA_INGRESS_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);
+
+ idx = ll_name_to_index(d);
+ if (!idx)
+ return nodev(d);
+
+ p.ifindex = idx;
+ }
+
+
+ if (p.eaction == TCA_EGRESS_MIRROR || p.eaction == TCA_INGRESS_MIRROR)
+ parse_action_control_dflt(&argc, &argv, &p.action, false,
+ TC_ACT_PIPE);
+
+ if (argc) {
+ if (iok && matches(*argv, "index") == 0) {
+ fprintf(stderr, "mirred: Illegal double index\n");
+ return -1;
+ }
+
+ 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 = addattr_nest(n, MAX_MSG, tca_id);
+ addattr_l(n, MAX_MSG, TCA_MIRRED_PARMS, &p, sizeof(p));
+ addattr_nest_end(n, 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, "ingress") == 0 ||
+ matches(*argv, "index") == 0) {
+ int ret = parse_direction(a, &argc, &argv, tca_id, n);
+
+ if (ret == 0) {
+ *argc_p = argc;
+ *argv_p = argv;
+ return 0;
+ }
+
+ } 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;
+
+ print_string(PRINT_ANY, "kind", "%s ", "mirred");
+ if (arg == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
+
+ if (tb[TCA_MIRRED_PARMS] == NULL) {
+ fprintf(stderr, "Missing mirred parameters\n");
+ return -1;
+ }
+ p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
+
+ dev = ll_index_to_name(p->ifindex);
+ if (dev == 0) {
+ fprintf(stderr, "Cannot find device %d\n", p->ifindex);
+ return -1;
+ }
+
+ print_string(PRINT_FP, NULL, "(%s", mirred_n2a(p->eaction));
+ print_string(PRINT_JSON, "mirred_action", NULL,
+ mirred_action(p->eaction));
+ print_string(PRINT_JSON, "direction", NULL,
+ mirred_direction(p->eaction));
+ print_string(PRINT_ANY, "to_dev", " to device %s)", dev);
+ print_action_control(f, " ", p->action, "");
+
+ print_nl();
+ print_uint(PRINT_ANY, "index", "\tindex %u", p->index);
+ print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
+ print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
+
+ if (show_stats) {
+ if (tb[TCA_MIRRED_TM]) {
+ struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
+
+ print_tm(f, tm);
+ }
+ }
+ print_nl();
+ return 0;
+}
+
+struct action_util mirred_action_util = {
+ .id = "mirred",
+ .parse_aopt = parse_mirred,
+ .print_aopt = print_mirred,
+};
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