netdev - [PATCH iproute2-next] tc: Classifier support for SPI field

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Message-ID: <20230725035016.505386-1-rkannoth@marvell.com>
Date: Tue, 25 Jul 2023 09:20:16 +0530
From: Ratheesh Kannoth <rkannoth@...vell.com>
To: <dsahern@...il.com>, <stephen@...workplumber.org>
CC: <netdev@...r.kernel.org>, Ratheesh Kannoth <rkannoth@...vell.com>
Subject: [PATCH iproute2-next] tc: Classifier support for SPI field

tc flower support for SPI field in ESP and AH packets.

Signed-off-by: Ratheesh Kannoth <rkannoth@...vell.com>
---
 include/uapi/linux/pkt_cls.h |  5 +++-
 tc/f_flower.c                | 55 ++++++++++++++++++++++++++++++++++--
 2 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 7865f5a9..fce639a6 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -594,6 +594,9 @@ enum {
 
 	TCA_FLOWER_KEY_L2TPV3_SID,	/* be32 */
 
+	TCA_FLOWER_KEY_SPI,		/* be32 */
+	TCA_FLOWER_KEY_SPI_MASK,	/* be32 */
+
 	TCA_FLOWER_L2_MISS,		/* u8 */
 
 	TCA_FLOWER_KEY_CFM,		/* nested */
diff --git a/tc/f_flower.c b/tc/f_flower.c
index 6da5028a..d31a6fcb 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -60,7 +60,7 @@ static void explain(void)
 		"			ppp_proto [ ipv4 | ipv6 | mpls_uc | mpls_mc | PPP_PROTO ] |\n"
 		"			dst_mac MASKED-LLADDR |\n"
 		"			src_mac MASKED-LLADDR |\n"
-		"			ip_proto [tcp | udp | sctp | icmp | icmpv6 | l2tp | IP-PROTO ] |\n"
+		"			ip_proto [tcp | udp | sctp | icmp | icmpv6 | l2tp | esp | ah | IP-PROTO ] |\n"
 		"			ip_tos MASKED-IP_TOS |\n"
 		"			ip_ttl MASKED-IP_TTL |\n"
 		"			mpls LSE-LIST |\n"
@@ -68,6 +68,7 @@ static void explain(void)
 		"			mpls_tc TC |\n"
 		"			mpls_bos BOS |\n"
 		"			mpls_ttl TTL |\n"
+		"			spi SPI-INDEX  |\n"
 		"			l2tpv3_sid LSID |\n"
 		"			dst_ip PREFIX |\n"
 		"			src_ip PREFIX |\n"
@@ -437,6 +438,16 @@ static int flower_parse_ip_proto(char *str, __be16 eth_type, int type,
 		    eth_type != htons(ETH_P_IPV6))
 			goto err;
 		ip_proto = IPPROTO_L2TP;
+	} else if (!strcmp(str, "esp")) {
+		if (eth_type != htons(ETH_P_IP) &&
+		    eth_type != htons(ETH_P_IPV6))
+			goto err;
+		ip_proto = IPPROTO_ESP;
+	} else if (!strcmp(str, "ah")) {
+		if (eth_type != htons(ETH_P_IP) &&
+		    eth_type != htons(ETH_P_IPV6))
+			goto err;
+		ip_proto = IPPROTO_AH;
 	} else {
 		ret = get_u8(&ip_proto, str, 16);
 		if (ret)
@@ -655,6 +666,29 @@ static int flower_parse_icmp(char *str, __u16 eth_type, __u8 ip_proto,
 	return flower_parse_u8(str, value_type, mask_type, NULL, NULL, n);
 }
 
+static int flower_parse_spi(char *str, __u8 ip_proto, struct nlmsghdr *n)
+{
+	__be32 spi;
+	int ret;
+
+	if (ip_proto != IPPROTO_UDP && ip_proto != IPPROTO_ESP && ip_proto != IPPROTO_AH) {
+		fprintf(stderr,
+			"Can't set \"spi\" if ip_proto isn't ESP/UDP/AH\n");
+		return -1;
+	}
+
+	ret = get_be32(&spi, str, 16);
+	if (ret < 0) {
+		fprintf(stderr, "Illegal \"spi index\"\n");
+		return -1;
+	}
+
+	addattr32(n, MAX_MSG, TCA_FLOWER_KEY_SPI, spi);
+	addattr32(n, MAX_MSG, TCA_FLOWER_KEY_SPI_MASK, UINT32_MAX);
+
+	return 0;
+}
+
 static int flower_parse_l2tpv3(char *str, __u8 ip_proto,
 			       struct nlmsghdr *n)
 {
@@ -1935,6 +1969,11 @@ static int flower_parse_opt(struct filter_util *qu, char *handle,
 			ret = flower_parse_l2tpv3(*argv, ip_proto, n);
 			if (ret < 0)
 				return -1;
+		} else if (!strcmp(*argv, "spi")) {
+			NEXT_ARG();
+			ret = flower_parse_spi(*argv, ip_proto, n);
+			if (ret < 0)
+				return -1;
 		} else if (matches(*argv, "arp_tip") == 0) {
 			NEXT_ARG();
 			ret = flower_parse_arp_ip_addr(*argv, eth_type,
@@ -2256,8 +2295,12 @@ static void flower_print_ip_proto(__u8 *p_ip_proto,
 		sprintf(out, "icmpv6");
 	else if (ip_proto == IPPROTO_L2TP)
 		sprintf(out, "l2tp");
+	else if (ip_proto == IPPROTO_ESP)
+		sprintf(out, "esp");
+	else if (ip_proto == IPPROTO_AH)
+		sprintf(out, "ah");
 	else
-		sprintf(out, "%02x", ip_proto);
+		sprintf(out, "0x%02x", ip_proto);
 
 	print_nl();
 	print_string(PRINT_ANY, "ip_proto", "  ip_proto %s", out);
@@ -3024,6 +3067,14 @@ static int flower_print_opt(struct filter_util *qu, FILE *f,
 			   rta_getattr_be32(attr));
 	}
 
+	if (tb[TCA_FLOWER_KEY_SPI]) {
+		struct rtattr *attr = tb[TCA_FLOWER_KEY_SPI];
+
+		print_nl();
+		print_hex(PRINT_ANY, "spi", "  spi 0x%x",
+			   rta_getattr_be32(attr));
+	}
+
 	flower_print_ip4_addr("arp_sip", tb[TCA_FLOWER_KEY_ARP_SIP],
 			     tb[TCA_FLOWER_KEY_ARP_SIP_MASK]);
 	flower_print_ip4_addr("arp_tip", tb[TCA_FLOWER_KEY_ARP_TIP],
-- 
2.25.1