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tc: flower: support matching on ICMP type and code

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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>
This commit is contained in:
Simon Horman 2016-12-07 14:54:03 +01:00 committed by Stephen Hemminger
parent 6910d65661
commit eb3b5696f1
2 changed files with 106 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
man/man8/tc-flower.8
View File

@ -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 " } | { "
@ -98,7 +98,7 @@ 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"
@ -117,6 +117,13 @@ 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.
.TP
.BI enc_key_id " NUMBER"
.TQ
.BI enc_dst_ip " ADDRESS"
@ -135,13 +142,16 @@ 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.

96
tc/f_flower.c
View File

@ -28,6 +28,11 @@ enum flower_endpoint {
FLOWER_ENDPOINT_DST
};
enum flower_icmp_field {
FLOWER_ICMP_FIELD_TYPE,
FLOWER_ICMP_FIELD_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"
" type ICMP-TYPE |\n"
" code ICMP-CODE }\n"
" enc_dst_ip [ IPV4-ADDR | IPV6-ADDR ] |\n"
" enc_src_ip [ IPV4-ADDR | IPV6-ADDR ] |\n"
" enc_key_id [ KEY-ID ] }\n"
@ -98,16 +105,23 @@ 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)
@ -116,6 +130,10 @@ 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,
@ -171,6 +189,41 @@ 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_FIELD_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_FIELD_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,
enum flower_icmp_field field, struct nlmsghdr *n)
{
int ret;
int type;
uint8_t value;
type = flower_icmp_attr_type(eth_type, ip_proto, field);
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)
@ -381,6 +434,22 @@ 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,
FLOWER_ICMP_FIELD_TYPE, 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,
FLOWER_ICMP_FIELD_CODE, n);
if (ret < 0) {
fprintf(stderr, "Illegal \"icmp code\"\n");
return -1;
}
} else if (matches(*argv, "enc_dst_ip") == 0) {
NEXT_ARG();
ret = flower_parse_ip_addr(*argv, 0,
@ -526,6 +595,10 @@ 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;
@ -581,6 +654,12 @@ static void flower_print_key_id(FILE *f, const char *name,
fprintf(f, "\n %s %d", name, rta_getattr_be32(attr));
}
static void flower_print_icmp(FILE *f, char *name, struct rtattr *attr)
{
if (attr)
fprintf(f, "\n %s %d", name, rta_getattr_u8(attr));
}
static int flower_print_opt(struct filter_util *qu, FILE *f,
struct rtattr *opt, __u32 handle)
{
@ -649,6 +728,13 @@ 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]);
flower_print_ip_addr(f, "enc_dst_ip",
tb[TCA_FLOWER_KEY_ENC_IPV4_DST_MASK] ?
htons(ETH_P_IP) : htons(ETH_P_IPV6),