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Date: Fri, 9 Nov 2018 09:51:43 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Amritha Nambiar <amritha.nambiar@...el.com>
Cc: stephen@...workplumber.org, netdev@...r.kernel.org,
jakub.kicinski@...ronome.com, sridhar.samudrala@...el.com,
jhs@...atatu.com, xiyou.wangcong@...il.com
Subject: Re: [iproute2 PATCH v2] tc: flower: Classify packets based port
ranges
Wed, Nov 07, 2018 at 10:22:50PM CET, amritha.nambiar@...el.com wrote:
>Added support for filtering based on port ranges.
>
>Example:
>1. Match on a port range:
>-------------------------
>$ tc filter add dev enp4s0 protocol ip parent ffff:\
> prio 1 flower ip_proto tcp dst_port range 20-30 skip_hw\
> action drop
>
>$ tc -s filter show dev enp4s0 parent ffff:
>filter protocol ip pref 1 flower chain 0
>filter protocol ip pref 1 flower chain 0 handle 0x1
> eth_type ipv4
> ip_proto tcp
> dst_port range 20-30
> skip_hw
> not_in_hw
> action order 1: gact action drop
> random type none pass val 0
> index 1 ref 1 bind 1 installed 85 sec used 3 sec
> Action statistics:
> Sent 460 bytes 10 pkt (dropped 10, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
>
>2. Match on IP address and port range:
>--------------------------------------
>$ tc filter add dev enp4s0 protocol ip parent ffff:\
> prio 1 flower dst_ip 192.168.1.1 ip_proto tcp dst_port range 100-200\
> skip_hw action drop
>
>$ tc -s filter show dev enp4s0 parent ffff:
>filter protocol ip pref 1 flower chain 0 handle 0x2
> eth_type ipv4
> ip_proto tcp
> dst_ip 192.168.1.1
> dst_port range 100-200
> skip_hw
> not_in_hw
> action order 1: gact action drop
> random type none pass val 0
> index 2 ref 1 bind 1 installed 58 sec used 2 sec
> Action statistics:
> Sent 920 bytes 20 pkt (dropped 20, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
>
>v2:
>Addressed Jiri's comment to sync output format with input
>
>Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
>---
> include/uapi/linux/pkt_cls.h | 7 ++
> tc/f_flower.c | 145 +++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 142 insertions(+), 10 deletions(-)
>
>diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
>index 401d0c1..b63c3cf 100644
>--- a/include/uapi/linux/pkt_cls.h
>+++ b/include/uapi/linux/pkt_cls.h
>@@ -405,6 +405,11 @@ enum {
> TCA_FLOWER_KEY_UDP_SRC, /* be16 */
> TCA_FLOWER_KEY_UDP_DST, /* be16 */
>
>+ TCA_FLOWER_KEY_PORT_SRC_MIN, /* be16 */
>+ TCA_FLOWER_KEY_PORT_SRC_MAX, /* be16 */
>+ TCA_FLOWER_KEY_PORT_DST_MIN, /* be16 */
>+ TCA_FLOWER_KEY_PORT_DST_MAX, /* be16 */
>+
> TCA_FLOWER_FLAGS,
> TCA_FLOWER_KEY_VLAN_ID, /* be16 */
> TCA_FLOWER_KEY_VLAN_PRIO, /* u8 */
>@@ -518,6 +523,8 @@ enum {
> TCA_FLOWER_KEY_FLAGS_FRAG_IS_FIRST = (1 << 1),
> };
>
>+#define TCA_FLOWER_MASK_FLAGS_RANGE (1 << 0) /* Range-based match */
>+
> /* Match-all classifier */
>
> enum {
>diff --git a/tc/f_flower.c b/tc/f_flower.c
>index 65fca04..7724a1d 100644
>--- a/tc/f_flower.c
>+++ b/tc/f_flower.c
>@@ -494,6 +494,66 @@ static int flower_parse_port(char *str, __u8 ip_proto,
> return 0;
> }
>
>+static int flower_port_range_attr_type(__u8 ip_proto, enum flower_endpoint type,
>+ __be16 *min_port_type,
>+ __be16 *max_port_type)
>+{
>+ if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP ||
>+ ip_proto == IPPROTO_SCTP) {
>+ if (type == FLOWER_ENDPOINT_SRC) {
>+ *min_port_type = TCA_FLOWER_KEY_PORT_SRC_MIN;
>+ *max_port_type = TCA_FLOWER_KEY_PORT_SRC_MAX;
>+ } else {
>+ *min_port_type = TCA_FLOWER_KEY_PORT_DST_MIN;
>+ *max_port_type = TCA_FLOWER_KEY_PORT_DST_MAX;
>+ }
>+ } else {
>+ return -1;
>+ }
>+
>+ return 0;
>+}
>+
>+static int flower_parse_port_range(__be16 *min, __be16 *max, __u8 ip_proto,
>+ enum flower_endpoint endpoint,
>+ struct nlmsghdr *n)
>+{
>+ __be16 min_port_type, max_port_type;
>+
>+ flower_port_range_attr_type(ip_proto, endpoint, &min_port_type,
>+ &max_port_type);
>+ addattr16(n, MAX_MSG, min_port_type, *min);
>+ addattr16(n, MAX_MSG, max_port_type, *max);
>+
>+ return 0;
>+}
>+
>+static int get_range(__be16 *min, __be16 *max, char *argv)
>+{
>+ char *r;
>+
>+ r = strchr(argv, '-');
>+ if (r) {
>+ *r = '\0';
>+ if (get_be16(min, argv, 10)) {
>+ fprintf(stderr, "invalid min range\n");
>+ return -1;
>+ }
>+ if (get_be16(max, r + 1, 10)) {
>+ fprintf(stderr, "invalid max range\n");
>+ return -1;
>+ }
>+ if (htons(*max) <= htons(*min)) {
>+ fprintf(stderr, "max value should be greater than min value\n");
>+ return -1;
>+ }
>+ } else {
>+ fprintf(stderr, "Illegal range format\n");
>+ return -1;
>+ }
>+ return 0;
>+}
>+
> #define TCP_FLAGS_MAX_MASK 0xfff
>
> static int flower_parse_tcp_flags(char *str, int flags_type, int mask_type,
>@@ -1061,20 +1121,54 @@ static int flower_parse_opt(struct filter_util *qu, char *handle,
> return -1;
> }
> } else if (matches(*argv, "dst_port") == 0) {
>+ __be16 min, max;
>+
> NEXT_ARG();
>- ret = flower_parse_port(*argv, ip_proto,
>- FLOWER_ENDPOINT_DST, n);
>- if (ret < 0) {
>- fprintf(stderr, "Illegal \"dst_port\"\n");
>- return -1;
>+ if (matches(*argv, "range") == 0) {
>+ NEXT_ARG();
>+ ret = get_range(&min, &max, *argv);
>+ if (ret < 0)
>+ return -1;
>+ ret = flower_parse_port_range(&min, &max,
>+ ip_proto,
>+ FLOWER_ENDPOINT_DST,
>+ n);
>+ if (ret < 0) {
>+ fprintf(stderr, "Illegal \"dst_port range\"\n");
>+ return -1;
>+ }
>+ } else {
>+ ret = flower_parse_port(*argv, ip_proto,
>+ FLOWER_ENDPOINT_DST, n);
>+ if (ret < 0) {
>+ fprintf(stderr, "Illegal \"dst_port\"\n");
>+ return -1;
>+ }
> }
> } else if (matches(*argv, "src_port") == 0) {
>+ __be16 min, max;
>+
> NEXT_ARG();
>- ret = flower_parse_port(*argv, ip_proto,
>- FLOWER_ENDPOINT_SRC, n);
>- if (ret < 0) {
>- fprintf(stderr, "Illegal \"src_port\"\n");
>- return -1;
>+ if (matches(*argv, "range") == 0) {
>+ NEXT_ARG();
>+ ret = get_range(&min, &max, *argv);
>+ if (ret < 0)
>+ return -1;
>+ ret = flower_parse_port_range(&min, &max,
>+ ip_proto,
>+ FLOWER_ENDPOINT_SRC,
>+ n);
>+ if (ret < 0) {
>+ fprintf(stderr, "Illegal \"src_port range\"\n");
>+ return -1;
>+ }
>+ } else {
>+ ret = flower_parse_port(*argv, ip_proto,
>+ FLOWER_ENDPOINT_SRC, n);
>+ if (ret < 0) {
>+ fprintf(stderr, "Illegal \"src_port\"\n");
>+ return -1;
>+ }
> }
> } else if (matches(*argv, "tcp_flags") == 0) {
> NEXT_ARG();
>@@ -1490,6 +1584,22 @@ static void flower_print_port(char *name, struct rtattr *attr)
> print_hu(PRINT_ANY, name, namefrm, rta_getattr_be16(attr));
> }
>
>+static void flower_print_port_range(char *name, struct rtattr *min_attr,
>+ struct rtattr *max_attr)
>+{
>+ SPRINT_BUF(namefrm);
>+ SPRINT_BUF(out);
>+ size_t done;
>+
>+ if (!min_attr || !max_attr)
>+ return;
>+
>+ done = sprintf(out, "%u", rta_getattr_be16(min_attr));
>+ sprintf(out + done, "-%u", rta_getattr_be16(max_attr));
>+ sprintf(namefrm, "\n %s %%s", name);
>+ print_string(PRINT_ANY, name, namefrm, out);
>+}
>+
> static void flower_print_tcp_flags(const char *name, struct rtattr *flags_attr,
> struct rtattr *mask_attr)
> {
>@@ -1678,6 +1788,7 @@ static int flower_print_opt(struct filter_util *qu, FILE *f,
> struct rtattr *opt, __u32 handle)
> {
> struct rtattr *tb[TCA_FLOWER_MAX + 1];
>+ __be16 min_port_type, max_port_type;
> int nl_type, nl_mask_type;
> __be16 eth_type = 0;
> __u8 ip_proto = 0xff;
>@@ -1796,6 +1907,20 @@ static int flower_print_opt(struct filter_util *qu, FILE *f,
> if (nl_type >= 0)
> flower_print_port("src_port", tb[nl_type]);
>
>+ if (flower_port_range_attr_type(ip_proto, FLOWER_ENDPOINT_DST,
>+ &min_port_type, &max_port_type)
>+ == 0) {
This is odd. Please convert to !fower_port....
>+ flower_print_port_range("dst_port range",
>+ tb[min_port_type], tb[max_port_type]);
>+ }
>+
>+ if (flower_port_range_attr_type(ip_proto, FLOWER_ENDPOINT_SRC,
>+ &min_port_type, &max_port_type)
>+ == 0) {
Same here.
>+ flower_print_port_range("src_port range",
>+ tb[min_port_type], tb[max_port_type]);
>+ }
>+
> flower_print_tcp_flags("tcp_flags", tb[TCA_FLOWER_KEY_TCP_FLAGS],
> tb[TCA_FLOWER_KEY_TCP_FLAGS_MASK]);
>
>
Otherwise this looks fine.
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