[PATCH/RFC iproute2/net-next 3/3] tc: flower: support matching on ICMP type and code

Simon Horman
2016-12-02T10:00:00Z

Support matching on ICMP type and code.

Example usage:

tc qdisc add dev eth0 ingress

tc filter add dev eth0 protocol ip parent ffff: flower \
indev eth0 ip_proto icmp type 8 code 0 action drop

tc filter add dev eth0 protocol ipv6 parent ffff: flower \
indev eth0 ip_proto icmpv6 type 128 code 0 action drop

Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
man/man8/tc-flower.8 | 20 ++++++++---
tc/f_flower.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 105 insertions(+), 11 deletions(-)

diff --git a/man/man8/tc-flower.8 b/man/man8/tc-flower.8
index a401293fed50..c01ace6249dd 100644
--- a/man/man8/tc-flower.8
+++ b/man/man8/tc-flower.8
@@ -29,7 +29,7 @@ flower \- flow based traffic control filter
.IR PRIORITY " | "
.BR vlan_eth_type " { " ipv4 " | " ipv6 " | "
.IR ETH_TYPE " } | "
-.BR ip_proto " { " tcp " | " udp " | " sctp " | "
+.BR ip_proto " { " tcp " | " udp " | " sctp " | " icmp " | " icmpv6 " | "
.IR IP_PROTO " } | { "
.BR dst_ip " | " src_ip " } { "
.IR ipv4_address " | " ipv6_address " } | { "
@@ -94,7 +94,7 @@ or an unsigned 16bit value in hexadecimal format.
Match on layer four protocol.
.I IP_PROTO
may be
-.BR tcp ", " udp ", " sctp
+.BR tcp ", " udp ", " sctp ", " icmp ", " icmpv6
or an unsigned 8bit value in hexadecimal format.
.TP
.BI dst_ip " ADDRESS"
@@ -112,6 +112,13 @@ option of tc filter.
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 type " NUMBER"
+.TQ
+.BI code " NUMBER"
+Match on ICMP type or code. Only available for
+.BR ip_proto " values " icmp " and " icmpv6
+which have to be specified in beforehand.
.SH NOTES
As stated above where applicable, matches of a certain layer implicitly depend
on the matches of the next lower layer. Precisely, layer one and two matches
@@ -120,13 +127,16 @@ have no dependency, layer three matches
(\fBip_proto\fR, \fBdst_ip\fR and \fBsrc_ip\fR)
depend on the
.B protocol
-option of tc filter
-and finally layer four matches
+option of tc filter, layer four port matches
(\fBdst_port\fR and \fBsrc_port\fR)
depend on
.B ip_proto
being set to
-.BR tcp ", " udp " or " sctp.
+.BR tcp ", " udp " or " sctp,
+and finally ICMP matches (\fBcode\fR and \fBtype\fR) depend on
+.B ip_proto
+being set to
+.BR icmp " or " icmpv6.
.P
There can be only used one mask per one prio. If user needs to specify different
mask, he has to use different prio.
diff --git a/tc/f_flower.c b/tc/f_flower.c
index 42253067b43d..59f6f1ea26e6 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -28,6 +28,11 @@ enum flower_endpoint {
flower_dst
};

+enum flower_icmp_field {
+ flower_icmp_type,
+ flower_icmp_code
+};
+
static void explain(void)
{
fprintf(stderr,
@@ -42,11 +47,13 @@ static void explain(void)
" vlan_ethtype [ ipv4 | ipv6 | ETH-TYPE ] |\n"
" dst_mac MAC-ADDR |\n"
" src_mac MAC-ADDR |\n"
- " ip_proto [tcp | udp | sctp | IP-PROTO ] |\n"
+ " ip_proto [tcp | udp | sctp | icmp | icmpv6 | IP-PROTO ] |\n"
" dst_ip [ IPV4-ADDR | IPV6-ADDR ] |\n"
" src_ip [ IPV4-ADDR | IPV6-ADDR ] |\n"
" dst_port PORT-NUMBER |\n"
- " src_port PORT-NUMBER }\n"
+ " src_port PORT-NUMBER |\n"
+ " type ICMP-TYPE |\n"
+ " code ICMP-CODE }\n"
" FILTERID := X:Y:Z\n"
" ACTION-SPEC := ... look at individual actions\n"
"\n"
@@ -95,16 +102,23 @@ static int flower_parse_ip_proto(char *str, __be16 eth_type, int type,
int ret;
__u8 ip_proto;

- if (eth_type != htons(ETH_P_IP) && eth_type != htons(ETH_P_IPV6)) {
- fprintf(stderr, "Illegal \"eth_type\" for ip proto\n");
- return -1;
- }
+ if (eth_type != htons(ETH_P_IP) && eth_type != htons(ETH_P_IPV6))
+ goto err;
+
if (matches(str, "tcp") == 0) {
ip_proto = IPPROTO_TCP;
} else if (matches(str, "udp") == 0) {
ip_proto = IPPROTO_UDP;
} else if (matches(str, "sctp") == 0) {
ip_proto = IPPROTO_SCTP;
+ } else if (matches(str, "icmp") == 0) {
+ if (eth_type != htons(ETH_P_IP))
+ goto err;
+ ip_proto = IPPROTO_ICMP;
+ } else if (matches(str, "icmpv6") == 0) {
+ if (eth_type != htons(ETH_P_IPV6))
+ goto err;
+ ip_proto = IPPROTO_ICMPV6;
} else {
ret = get_u8(&ip_proto, str, 16);
if (ret)
@@ -113,6 +127,10 @@ static int flower_parse_ip_proto(char *str, __be16 eth_type, int type,
addattr8(n, MAX_MSG, type, ip_proto);
*p_ip_proto = ip_proto;
return 0;
+
+err:
+ fprintf(stderr, "Illegal \"eth_type\" for ip proto\n");
+ return -1;
}

static int flower_parse_ip_addr(char *str, __be16 eth_type,
@@ -165,6 +183,39 @@ static int flower_parse_ip_addr(char *str, __be16 eth_type,
return 0;
}

+static int flower_icmp_attr_type(__be16 eth_type, __u8 ip_proto,
+ enum flower_icmp_field field)
+{
+ if (eth_type == htons(ETH_P_IP) && ip_proto == IPPROTO_ICMP)
+ return field == flower_icmp_code ? TCA_FLOWER_KEY_ICMPV4_CODE :
+ TCA_FLOWER_KEY_ICMPV4_TYPE;
+ else if (eth_type == htons(ETH_P_IPV6) &&ip_proto == IPPROTO_ICMPV6)
+ return field == flower_icmp_code ? TCA_FLOWER_KEY_ICMPV6_CODE :
+ TCA_FLOWER_KEY_ICMPV6_TYPE;
+
+ return -1;
+}
+
+static int flower_parse_icmp(char *str, __u16 eth_type, __u8 ip_proto,
+ bool is_code, struct nlmsghdr *n)
+{
+ int ret;
+ int type;
+ uint8_t value;
+
+ type = flower_icmp_attr_type(eth_type, ip_proto, is_code);
+ if (type < 0)
+ return -1;
+
+ ret = get_u8(&value, str, 10);
+ if (ret)
+ return -1;
+
+ addattr8(n, MAX_MSG, type, value);
+
+ return 0;
+}
+
static int flower_port_attr_type(__u8 ip_proto, enum flower_endpoint endpoint)
{
if (ip_proto == IPPROTO_TCP)
@@ -358,6 +409,22 @@ static int flower_parse_opt(struct filter_util *qu, char *handle,
fprintf(stderr, "Illegal \"src_port\"\n");
return -1;
}
+ } else if (matches(*argv, "type") == 0) {
+ NEXT_ARG();
+ ret = flower_parse_icmp(*argv, eth_type, ip_proto,
+ false, n);
+ if (ret < 0) {
+ fprintf(stderr, "Illegal \"icmp type\"\n");
+ return -1;
+ }
+ } else if (matches(*argv, "code") == 0) {
+ NEXT_ARG();
+ ret = flower_parse_icmp(*argv, eth_type, ip_proto,
+ true, n);
+ if (ret < 0) {
+ fprintf(stderr, "Illegal \"icmp code\"\n");
+ return -1;
+ }
} else if (matches(*argv, "action") == 0) {
NEXT_ARG();
ret = parse_action(&argc, &argv, TCA_FLOWER_ACT, n);
@@ -471,6 +538,10 @@ static void flower_print_ip_proto(FILE *f, __u8 *p_ip_proto,
fprintf(f, "udp");
else if (ip_proto == IPPROTO_SCTP)
fprintf(f, "sctp");
+ else if (ip_proto == IPPROTO_ICMP)
+ fprintf(f, "icmp");
+ else if (ip_proto == IPPROTO_ICMPV6)
+ fprintf(f, "icmpv6");
else
fprintf(f, "%02x", ip_proto);
*p_ip_proto = ip_proto;
@@ -519,6 +590,12 @@ static void flower_print_port(FILE *f, char *name, struct rtattr *attr)
fprintf(f, "\n %s %d", name, ntohs(rta_getattr_u16(attr)));
}

+static void flower_print_icmp(FILE *f, char *name, struct rtattr *attr)
+{
+ if (attr)
+ fprintf(f, "\n %s %d", name, ntohs(rta_getattr_u8(attr)));
+}
+
static int flower_print_opt(struct filter_util *qu, FILE *f,
struct rtattr *opt, __u32 handle)
{
@@ -587,6 +664,13 @@ static int flower_print_opt(struct filter_util *qu, FILE *f,
if (nl_type >= 0)
flower_print_port(f, "src_port", tb[nl_type]);

+ nl_type = flower_icmp_attr_type(eth_type, ip_proto, false);
+ if (nl_type >= 0)
+ flower_print_icmp(f, "icmp_type", tb[nl_type]);
+ nl_type = flower_icmp_attr_type(eth_type, ip_proto, true);
+ if (nl_type >= 0)
+ flower_print_icmp(f, "icmp_code", tb[nl_type]);
+
if (tb[TCA_FLOWER_FLAGS]) {
__u32 flags = rta_getattr_u32(tb[TCA_FLOWER_FLAGS]);

--
2.7.0.rc3.207.g0ac5344