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Message-Id: <20170523143344.5067-1-jiri@resnulli.us>
Date: Tue, 23 May 2017 16:33:44 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, jhs@...atatu.com, xiyou.wangcong@...il.com,
simon.horman@...ronome.com, mlxsw@...lanox.com, idosch@...lanox.com
Subject: [patch iproute2] tc: flower: add support for tcp flags
From: Jiri Pirko <jiri@...lanox.com>
Allow user to insert a flower classifier filter rule which includes
match for tcp flags.
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
include/linux/pkt_cls.h | 3 +++
man/man8/tc-flower.8 | 8 +++++++
tc/f_flower.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 74 insertions(+)
diff --git a/include/linux/pkt_cls.h b/include/linux/pkt_cls.h
index d613be3..ce9dfb9 100644
--- a/include/linux/pkt_cls.h
+++ b/include/linux/pkt_cls.h
@@ -450,6 +450,9 @@ enum {
TCA_FLOWER_KEY_MPLS_TC, /* u8 - 3 bits */
TCA_FLOWER_KEY_MPLS_LABEL, /* be32 - 20 bits */
+ TCA_FLOWER_KEY_TCP_FLAGS, /* be16 */
+ TCA_FLOWER_KEY_TCP_FLAGS_MASK, /* be16 */
+
__TCA_FLOWER_MAX,
};
diff --git a/man/man8/tc-flower.8 b/man/man8/tc-flower.8
index ba29065..7648079 100644
--- a/man/man8/tc-flower.8
+++ b/man/man8/tc-flower.8
@@ -35,6 +35,8 @@ flower \- flow based traffic control filter
.IR PREFIX " | { "
.BR dst_port " | " src_port " } "
.IR port_number " } | "
+.B tcp_flags
+.IR MASKED_TCP_FLAGS " | "
.B type
.IR MASKED_TYPE " | "
.B code
@@ -136,6 +138,12 @@ Match on layer 4 protocol source or destination port number. Only available for
.BR ip_proto " values " udp ", " tcp " and " sctp
which have to be specified in beforehand.
.TP
+.BI tcp_flags " MASKED_TCP_FLAGS"
+Match on TCP flags represented as 12bit bitfield in in hexadecimal format.
+A mask may be optionally provided to limit the bits which are matched. A mask
+is provided by following the value with a slash and then the mask. If the mask
+is missing then a match on all bits is assumed.
+.TP
.BI type " MASKED_TYPE"
.TQ
.BI code " MASKED_CODE"
diff --git a/tc/f_flower.c b/tc/f_flower.c
index ebc63ca..c74a681 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -57,6 +57,7 @@ static void explain(void)
" src_ip PREFIX |\n"
" dst_port PORT-NUMBER |\n"
" src_port PORT-NUMBER |\n"
+ " tcp_flags MASKED-TCP_FLAGS |\n"
" type MASKED-ICMP-TYPE |\n"
" code MASKED-ICMP-CODE |\n"
" arp_tip IPV4-PREFIX |\n"
@@ -474,6 +475,42 @@ static int flower_parse_port(char *str, __u8 ip_proto,
return 0;
}
+#define TCP_FLAGS_MAX_MASK 0xfff
+
+static int flower_parse_tcp_flags(char *str, int flags_type, int mask_type,
+ struct nlmsghdr *n)
+{
+ char *slash;
+ int ret, err = -1;
+ __u16 flags;
+
+ slash = strchr(str, '/');
+ if (slash)
+ *slash = '\0';
+
+ ret = get_u16(&flags, str, 16);
+ printf("ret %d flags %x %x\n", ret, flags, flags & ~TCP_FLAGS_MAX_MASK);
+ if (ret < 0 || flags & ~TCP_FLAGS_MAX_MASK)
+ goto err;
+
+ addattr16(n, MAX_MSG, flags_type, htons(flags));
+
+ if (slash) {
+ ret = get_u16(&flags, str, 16);
+ if (ret < 0 || flags & ~TCP_FLAGS_MAX_MASK)
+ goto err;
+ } else {
+ flags = TCP_FLAGS_MAX_MASK;
+ }
+ addattr16(n, MAX_MSG, mask_type, htons(flags));
+
+ err = 0;
+err:
+ if (slash)
+ *slash = '/';
+ return err;
+}
+
static int flower_parse_key_id(const char *str, int type, struct nlmsghdr *n)
{
int ret;
@@ -671,6 +708,16 @@ static int flower_parse_opt(struct filter_util *qu, char *handle,
fprintf(stderr, "Illegal \"src_port\"\n");
return -1;
}
+ } else if (matches(*argv, "tcp_flags") == 0) {
+ NEXT_ARG();
+ ret = flower_parse_tcp_flags(*argv,
+ TCA_FLOWER_KEY_TCP_FLAGS,
+ TCA_FLOWER_KEY_TCP_FLAGS_MASK,
+ n);
+ if (ret < 0) {
+ fprintf(stderr, "Illegal \"tcp_flags\"\n");
+ return -1;
+ }
} else if (matches(*argv, "type") == 0) {
NEXT_ARG();
ret = flower_parse_icmp(*argv, eth_type, ip_proto,
@@ -1000,6 +1047,19 @@ static void flower_print_port(FILE *f, char *name, struct rtattr *attr)
fprintf(f, "\n %s %d", name, rta_getattr_be16(attr));
}
+static void flower_print_tcp_flags(FILE *f, char *name,
+ struct rtattr *flags_attr,
+ struct rtattr *mask_attr)
+{
+ if (!flags_attr)
+ return;
+ fprintf(f, "\n %s %x", name, rta_getattr_be16(flags_attr));
+ if (!mask_attr)
+ return;
+ fprintf(f, "/%x", rta_getattr_be16(mask_attr));
+}
+
+
static void flower_print_key_id(FILE *f, const char *name,
struct rtattr *attr)
{
@@ -1110,6 +1170,9 @@ static int flower_print_opt(struct filter_util *qu, FILE *f,
if (nl_type >= 0)
flower_print_port(f, "src_port", tb[nl_type]);
+ flower_print_tcp_flags(f, "tcp_flags", tb[TCA_FLOWER_KEY_TCP_FLAGS],
+ tb[TCA_FLOWER_KEY_TCP_FLAGS_MASK]);
+
nl_type = flower_icmp_attr_type(eth_type, ip_proto,
FLOWER_ICMP_FIELD_TYPE);
nl_mask_type = flower_icmp_attr_mask_type(eth_type, ip_proto,
--
2.9.3
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