From 13127e1bbe84181c259c61eb65ca2b707f3ed31b Mon Sep 17 00:00:00 2001
From: Ivan Vecera <ivecera@redhat.com>
Date: Wed, 31 May 2017 15:38:41 +0200
Subject: [PATCH 164/169] tc: Add support for the matchall traffic classifier.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1435624
Upstream status: iproute2.git commit d5cbf3ff0561b

Upstream commit(s):
commit d5cbf3ff0561b6c8158c3538c7fe1946add9dec3
Author: Yotam Gigi <yotamg@mellanox.com>
Date:   Wed Aug 31 09:28:26 2016 +0200

    tc: Add support for the matchall traffic classifier.

    The matchall classifier matches every packet and allows the user to apply
    actions on it. In addition, it supports the skip_sw and skip_hw (as can
    be found on u32 and flower filter) that direct the kernel to skip the
    software/hardware processing of the actions.

    This filter is very useful in usecases where every packet should be
    matched. For example, packet mirroring (SPAN) can be setup very easily
    using that filter.

    Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
    Signed-off-by: Jiri Pirko <jiri@mellanox.com>

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
---
 tc/Makefile     |   1 +
 tc/f_matchall.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 144 insertions(+)
 create mode 100644 tc/f_matchall.c

diff --git a/tc/Makefile b/tc/Makefile
index a6ad9aee..6967a942 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -59,6 +59,7 @@ TCMODULES += q_mqprio.o
 TCMODULES += q_codel.o
 TCMODULES += q_fq_codel.o
 TCMODULES += q_fq.o
+TCMODULES += f_matchall.o
 
 ifeq ($(TC_CONFIG_IPSET), y)
   ifeq ($(TC_CONFIG_XT), y)
diff --git a/tc/f_matchall.c b/tc/f_matchall.c
new file mode 100644
index 00000000..04e524e3
--- /dev/null
+++ b/tc/f_matchall.c
@@ -0,0 +1,143 @@
+/*
+ * f_matchall.c		Match-all Classifier
+ *
+ *		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:	Jiri Pirko <jiri@mellanox.com>, Yotam Gigi <yotamg@mellanox.com>
+ *
+ */
+
+#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.h>
+
+#include "utils.h"
+#include "tc_util.h"
+
+static void explain(void)
+{
+	fprintf(stderr, "Usage: ... matchall [skip_sw | skip_hw]\n");
+	fprintf(stderr, "                 [ action ACTION_SPEC ] [ classid CLASSID ]\n");
+	fprintf(stderr, "\n");
+	fprintf(stderr, "Where: SELECTOR := SAMPLE SAMPLE ...\n");
+	fprintf(stderr, "       FILTERID := X:Y:Z\n");
+	fprintf(stderr, "       ACTION_SPEC := ... look at individual actions\n");
+	fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
+}
+
+static int matchall_parse_opt(struct filter_util *qu, char *handle,
+			   int argc, char **argv, struct nlmsghdr *n)
+{
+	struct tcmsg *t = NLMSG_DATA(n);
+	struct rtattr *tail;
+	__u32 flags = 0;
+	long h = 0;
+
+	if (handle) {
+		h = strtol(handle, NULL, 0);
+		if (h == LONG_MIN || h == LONG_MAX) {
+			fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
+			    handle);
+			return -1;
+		}
+	}
+	t->tcm_handle = h;
+
+	if (argc == 0)
+		return 0;
+
+	tail = (struct rtattr *)(((void *)n)+NLMSG_ALIGN(n->nlmsg_len));
+	addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
+
+	while (argc > 0) {
+		if (matches(*argv, "classid") == 0 ||
+			   strcmp(*argv, "flowid") == 0) {
+			unsigned int handle;
+
+			NEXT_ARG();
+			if (get_tc_classid(&handle, *argv)) {
+				fprintf(stderr, "Illegal \"classid\"\n");
+				return -1;
+			}
+			addattr_l(n, MAX_MSG, TCA_MATCHALL_CLASSID, &handle, 4);
+		} else if (matches(*argv, "action") == 0) {
+			NEXT_ARG();
+			if (parse_action(&argc, &argv, TCA_MATCHALL_ACT, n)) {
+				fprintf(stderr, "Illegal \"action\"\n");
+				return -1;
+			}
+			continue;
+
+		} else if (strcmp(*argv, "skip_hw") == 0) {
+			NEXT_ARG();
+			flags |= TCA_CLS_FLAGS_SKIP_HW;
+			continue;
+		} else if (strcmp(*argv, "skip_sw") == 0) {
+			NEXT_ARG();
+			flags |= TCA_CLS_FLAGS_SKIP_SW;
+			continue;
+		} else if (strcmp(*argv, "help") == 0) {
+			explain();
+			return -1;
+		} else {
+			fprintf(stderr, "What is \"%s\"?\n", *argv);
+			explain();
+			return -1;
+		}
+		argc--; argv++;
+	}
+
+	if (flags) {
+		if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW |
+			       TCA_CLS_FLAGS_SKIP_SW))) {
+			fprintf(stderr,
+				"skip_hw and skip_sw are mutually exclusive\n");
+			return -1;
+		}
+		addattr_l(n, MAX_MSG, TCA_MATCHALL_FLAGS, &flags, 4);
+	}
+
+	tail->rta_len = (((void *)n)+n->nlmsg_len) - (void *)tail;
+	return 0;
+}
+
+static int matchall_print_opt(struct filter_util *qu, FILE *f,
+			   struct rtattr *opt, __u32 handle)
+{
+	struct rtattr *tb[TCA_MATCHALL_MAX+1];
+
+	if (opt == NULL)
+		return 0;
+
+	parse_rtattr_nested(tb, TCA_MATCHALL_MAX, opt);
+
+	if (handle)
+		fprintf(f, "handle 0x%x ", handle);
+
+	if (tb[TCA_MATCHALL_CLASSID]) {
+		SPRINT_BUF(b1);
+		fprintf(f, "flowid %s ",
+			sprint_tc_classid(rta_getattr_u32(tb[TCA_MATCHALL_CLASSID]), b1));
+	}
+
+	if (tb[TCA_MATCHALL_ACT])
+		tc_print_action(f, tb[TCA_MATCHALL_ACT]);
+
+	return 0;
+}
+
+struct filter_util matchall_filter_util = {
+	.id = "matchall",
+	.parse_fopt = matchall_parse_opt,
+	.print_fopt = matchall_print_opt,
+};
-- 
2.13.0