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Date: Wed, 5 Oct 2022 12:44:32 +0200
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: netdev@...r.kernel.org
Cc: dsahern@...il.com, stephen@...workplumber.org, gnault@...hat.com
Subject: [PATCH iproute2-next v2 3/3] f_flower: Introduce L2TPv3 support
Add support for matching on L2TPv3 session ID.
Session ID can be specified only when ip proto was
set to IPPROTO_L2TP.
L2TPv3 might be transported over IP or over UDP,
this implementation is only about L2TPv3 over IP.
IPv6 is also supported, in this case next header
is set to IPPROTO_L2TP.
Example filter:
# tc filter add dev eth0 ingress prio 1 protocol ip \
flower \
ip_proto l2tp \
l2tpv3_sid 1234 \
skip_sw \
action drop
Signed-off-by: Wojciech Drewek <wojciech.drewek@...el.com>
---
man/man8/tc-flower.8 | 11 ++++++++--
tc/f_flower.c | 49 +++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 57 insertions(+), 3 deletions(-)
diff --git a/man/man8/tc-flower.8 b/man/man8/tc-flower.8
index 5e486ea31d37..4de823e4ef3e 100644
--- a/man/man8/tc-flower.8
+++ b/man/man8/tc-flower.8
@@ -54,7 +54,9 @@ flower \- flow based traffic control filter
.IR BOS " | "
.B mpls_ttl
.IR TTL " | "
-.BR ip_proto " { " tcp " | " udp " | " sctp " | " icmp " | " icmpv6 " | "
+.B l2tpv3_sid
+.IR LSID " | "
+.BR ip_proto " { " tcp " | " udp " | " sctp " | " icmp " | " icmpv6 " | " l2tp " | "
.IR IP_PROTO " } | "
.B ip_tos
.IR MASKED_IP_TOS " | "
@@ -291,11 +293,16 @@ entry.
.I TTL
is an unsigned 8 bit value in decimal format.
.TP
+.BI l2tpv3_sid " LSID"
+Match on L2TPv3 session id field transported over IP or IPv6.
+.I LSID
+is an unsigned 32 bit value in decimal format.
+.TP
.BI ip_proto " IP_PROTO"
Match on layer four protocol.
.I IP_PROTO
may be
-.BR tcp ", " udp ", " sctp ", " icmp ", " icmpv6
+.BR tcp ", " udp ", " sctp ", " icmp ", " icmpv6 ", " l2tp
or an unsigned 8bit value in hexadecimal format.
.TP
.BI ip_tos " MASKED_IP_TOS"
diff --git a/tc/f_flower.c b/tc/f_flower.c
index 069896a48f33..a9085bf0d1c5 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -26,6 +26,10 @@
#include "tc_util.h"
#include "rt_names.h"
+#ifndef IPPROTO_L2TP
+#define IPPROTO_L2TP 115
+#endif
+
enum flower_matching_flags {
FLOWER_IP_FLAGS,
};
@@ -60,7 +64,7 @@ static void explain(void)
" ppp_proto [ ipv4 | ipv6 | mpls_uc | mpls_mc | PPP_PROTO ]"
" dst_mac MASKED-LLADDR |\n"
" src_mac MASKED-LLADDR |\n"
- " ip_proto [tcp | udp | sctp | icmp | icmpv6 | IP-PROTO ] |\n"
+ " ip_proto [tcp | udp | sctp | icmp | icmpv6 | l2tp | IP-PROTO ] |\n"
" ip_tos MASKED-IP_TOS |\n"
" ip_ttl MASKED-IP_TTL |\n"
" mpls LSE-LIST |\n"
@@ -68,6 +72,7 @@ static void explain(void)
" mpls_tc TC |\n"
" mpls_bos BOS |\n"
" mpls_ttl TTL |\n"
+ " l2tpv3_sid LSID |\n"
" dst_ip PREFIX |\n"
" src_ip PREFIX |\n"
" dst_port PORT-NUMBER |\n"
@@ -428,6 +433,11 @@ static int flower_parse_ip_proto(char *str, __be16 eth_type, int type,
if (eth_type != htons(ETH_P_IPV6))
goto err;
ip_proto = IPPROTO_ICMPV6;
+ } else if (!strcmp(str, "l2tp")) {
+ if (eth_type != htons(ETH_P_IP) &&
+ eth_type != htons(ETH_P_IPV6))
+ goto err;
+ ip_proto = IPPROTO_L2TP;
} else {
ret = get_u8(&ip_proto, str, 16);
if (ret)
@@ -646,6 +656,28 @@ 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_l2tpv3(char *str, __be16 eth_type, __u8 ip_proto,
+ struct nlmsghdr *n)
+{
+ __be32 sid;
+ int ret;
+
+ if ((eth_type != htons(ETH_P_IP) && eth_type != htons(ETH_P_IPV6)) ||
+ ip_proto != IPPROTO_L2TP) {
+ fprintf(stderr,
+ "Can't set \"l2tpv3_sid\" if ethertype isn't IP and IPv6 or ip_proto isn't l2tp\n");
+ return -1;
+ }
+ ret = get_be32(&sid, str, 10);
+ if (ret < 0) {
+ fprintf(stderr, "Illegal \"l2tpv3 session id\"\n");
+ return -1;
+ }
+ addattr32(n, MAX_MSG, TCA_FLOWER_KEY_L2TPV3_SID, sid);
+
+ return 0;
+}
+
static int flower_port_attr_type(__u8 ip_proto, enum flower_endpoint endpoint)
{
if (ip_proto == IPPROTO_TCP)
@@ -1840,6 +1872,11 @@ static int flower_parse_opt(struct filter_util *qu, char *handle,
fprintf(stderr, "Illegal \"icmp code\"\n");
return -1;
}
+ } else if (!strcmp(*argv, "l2tpv3_sid")) {
+ NEXT_ARG();
+ ret = flower_parse_l2tpv3(*argv, eth_type, 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,
@@ -2153,6 +2190,8 @@ static void flower_print_ip_proto(__u8 *p_ip_proto,
sprintf(out, "icmp");
else if (ip_proto == IPPROTO_ICMPV6)
sprintf(out, "icmpv6");
+ else if (ip_proto == IPPROTO_L2TP)
+ sprintf(out, "l2tp");
else
sprintf(out, "%02x", ip_proto);
@@ -2880,6 +2919,14 @@ static int flower_print_opt(struct filter_util *qu, FILE *f,
flower_print_masked_u8("icmp_code", tb[nl_type],
tb[nl_mask_type], NULL);
+ if (tb[TCA_FLOWER_KEY_L2TPV3_SID]) {
+ struct rtattr *attr = tb[TCA_FLOWER_KEY_L2TPV3_SID];
+
+ print_nl();
+ print_uint(PRINT_ANY, "l2tpv3_sid", " l2tpv3_sid %u",
+ 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],
--
2.31.1
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