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Date: Thu, 27 Jun 2024 18:55:47 +0200
From: Davide Caratti <dcaratti@...hat.com>
To: Asbjørn Sloth Tønnesen <ast@...erby.net>
Cc: David Ahern <dsahern@...nel.org>,
aclaudi@...hat.com,
Ilya Maximets <i.maximets@....org>,
echaudro@...hat.com,
netdev@...r.kernel.org,
Jamal Hadi Salim <jhs@...atatu.com>
Subject: [RFC iproute2-next] tc: f_flower: add support for matching on tunnel metadata
extend TC flower for matching on tunnel metadata.
smoke test:
# ip link add name myep type dummy
# ip link set dev myep up
# ip address add dev myep 192.0.2.1/24
# ip neigh add dev myep 192.0.2.2 lladdr 00:c1:a0:c1:a0:00 nud permanent
# ip link add name mytun type vxlan external
# ip link set dev mytun up
# tc qdisc add dev mytun clsact
# tc filter add dev mytun egress protocol ip pref 1 handle 1 matchall action tunnel_key \
> set src_ip 192.0.2.1 dst_ip 192.0.2.2 id 42 csum nofrag continue index 1
# tc filter add dev mytun egress protocol ip pref 2 handle 2 flower action continue index 30
# tc filter add dev mytun egress protocol ip pref 3 handle 3 flower enc_src_ip 192.0.2.1 action continue index 30
# tc filter add dev mytun egress protocol ip pref 4 handle 4 flower enc_flags tundf action pipe index 100
# mausezahn mytun -c 1 -p 100 -a 00:aa:bb:cc:dd:ee -b 00:ee:dd:cc:bb:aa -t icmp -q
# expect 2 packets below
# tc -s action get action gact index 30
# expect 1 packet below
# tc -s action get action gact index 100
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
include/uapi/linux/pkt_cls.h | 8 +++++++
tc/f_flower.c | 42 ++++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+)
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 229fc925ec3a..24795aad7651 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -554,6 +554,9 @@ enum {
TCA_FLOWER_KEY_SPI, /* be32 */
TCA_FLOWER_KEY_SPI_MASK, /* be32 */
+ TCA_FLOWER_KEY_ENC_FLAGS, /* u32 */
+ TCA_FLOWER_KEY_ENC_FLAGS_MASK, /* u32 */
+
__TCA_FLOWER_MAX,
};
@@ -674,6 +677,11 @@ enum {
enum {
TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT = (1 << 0),
TCA_FLOWER_KEY_FLAGS_FRAG_IS_FIRST = (1 << 1),
+ /* FLOW_DIS_ENCAPSULATION (1 << 2) is not exposed to userspace */
+ TCA_FLOWER_KEY_FLAGS_TUNNEL_CSUM = (1 << 3),
+ TCA_FLOWER_KEY_FLAGS_TUNNEL_DONT_FRAGMENT = (1 << 4),
+ TCA_FLOWER_KEY_FLAGS_TUNNEL_OAM = (1 << 5),
+ TCA_FLOWER_KEY_FLAGS_TUNNEL_CRIT_OPT = (1 << 6),
};
enum {
diff --git a/tc/f_flower.c b/tc/f_flower.c
index 08c1001af7b4..45fc31dc380f 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -17,6 +17,7 @@
#include <linux/tc_act/tc_vlan.h>
#include <linux/mpls.h>
#include <linux/ppp_defs.h>
+#include <linux/if_tunnel.h>
#include "utils.h"
#include "tc_util.h"
@@ -28,6 +29,7 @@
enum flower_matching_flags {
FLOWER_IP_FLAGS,
+ FLOWER_ENC_DST_FLAGS,
};
enum flower_endpoint {
@@ -92,6 +94,7 @@ static void explain(void)
" erspan_opts MASKED-OPTIONS |\n"
" gtp_opts MASKED-OPTIONS |\n"
" pfcp_opts MASKED-OPTIONS |\n"
+ " enc_flags ENC-FLAGS |\n"
" ip_flags IP-FLAGS |\n"
" l2_miss L2_MISS |\n"
" enc_dst_port [ port_number ] |\n"
@@ -205,6 +208,11 @@ struct flag_to_string {
static struct flag_to_string flags_str[] = {
{ TCA_FLOWER_KEY_FLAGS_IS_FRAGMENT, FLOWER_IP_FLAGS, "frag" },
{ TCA_FLOWER_KEY_FLAGS_FRAG_IS_FIRST, FLOWER_IP_FLAGS, "firstfrag" },
+ { TCA_FLOWER_KEY_FLAGS_TUNNEL_CSUM, FLOWER_ENC_DST_FLAGS, "csum" },
+ { TCA_FLOWER_KEY_FLAGS_TUNNEL_DONT_FRAGMENT, FLOWER_ENC_DST_FLAGS, "tundf" },
+ { TCA_FLOWER_KEY_FLAGS_TUNNEL_OAM, FLOWER_ENC_DST_FLAGS, "oam" },
+ { TCA_FLOWER_KEY_FLAGS_TUNNEL_CRIT_OPT, FLOWER_ENC_DST_FLAGS, "crit" },
+
};
static int flower_parse_matching_flags(char *str,
@@ -1461,6 +1469,29 @@ static int flower_parse_enc_opts_pfcp(char *str, struct nlmsghdr *n)
return 0;
}
+static int flower_parse_enc_dstflags(char *str, struct nlmsghdr *n)
+{
+
+ __u32 dst_flags, dst_flags_mask;
+ int err;
+
+ err = flower_parse_matching_flags(str,
+ FLOWER_ENC_DST_FLAGS,
+ &dst_flags,
+ &dst_flags_mask);
+
+ if (err < 0 || !dst_flags_mask)
+ return -1;
+ err = addattr32(n, MAX_MSG, TCA_FLOWER_KEY_ENC_FLAGS, htonl(dst_flags));
+ if (err < 0)
+ return -1;
+ err = addattr32(n, MAX_MSG, TCA_FLOWER_KEY_ENC_FLAGS_MASK, htonl(dst_flags_mask));
+ if (err < 0)
+ return -1;
+
+ return 0;
+}
+
static int flower_parse_mpls_lse(int *argc_p, char ***argv_p,
struct nlmsghdr *nlh)
{
@@ -2248,6 +2279,13 @@ static int flower_parse_opt(const struct filter_util *qu, char *handle,
fprintf(stderr, "Illegal \"pfcp_opts\"\n");
return -1;
}
+ } else if (matches(*argv, "enc_flags") == 0) {
+ NEXT_ARG();
+ ret = flower_parse_enc_dstflags(*argv, n);
+ if (ret < 0) {
+ fprintf(stderr, "Illegal \"enc_flags\"\n");
+ return -1;
+ }
} else if (matches(*argv, "action") == 0) {
NEXT_ARG();
ret = parse_action(&argc, &argv, TCA_FLOWER_ACT, n);
@@ -3262,6 +3300,10 @@ static int flower_print_opt(const struct filter_util *qu, FILE *f,
tb[TCA_FLOWER_KEY_FLAGS],
tb[TCA_FLOWER_KEY_FLAGS_MASK]);
+ flower_print_matching_flags("enc_flags", FLOWER_ENC_DST_FLAGS,
+ tb[TCA_FLOWER_KEY_ENC_FLAGS],
+ tb[TCA_FLOWER_KEY_ENC_FLAGS_MASK]);
+
if (tb[TCA_FLOWER_L2_MISS]) {
struct rtattr *attr = tb[TCA_FLOWER_L2_MISS];
--
2.45.1
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