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Date: Fri, 12 Oct 2018 06:53:30 -0700
From: Amritha Nambiar <amritha.nambiar@...el.com>
To: netdev@...r.kernel.org, davem@...emloft.net
Cc: jakub.kicinski@...ronome.com, amritha.nambiar@...el.com,
sridhar.samudrala@...el.com, jhs@...atatu.com,
xiyou.wangcong@...il.com, jiri@...nulli.us
Subject: [net-next PATCH] net: sched: cls_flower: Classify packets using
port ranges
Added support in tc flower for filtering based on port ranges.
This is a rework of the RFC patch at:
https://patchwork.ozlabs.org/patch/969595/
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_min 20
dst_port_max 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 181 sec used 5 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_min 100
dst_port_max 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 28 sec used 6 sec
Action statistics:
Sent 460 bytes 10 pkt (dropped 10, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
---
include/uapi/linux/pkt_cls.h | 5 ++
net/sched/cls_flower.c | 134 ++++++++++++++++++++++++++++++++++++++++--
2 files changed, 132 insertions(+), 7 deletions(-)
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 401d0c1..b569308 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 */
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 9aada2d..5f135f0 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -55,6 +55,9 @@ struct fl_flow_key {
struct flow_dissector_key_ip ip;
struct flow_dissector_key_ip enc_ip;
struct flow_dissector_key_enc_opts enc_opts;
+
+ struct flow_dissector_key_ports tp_min;
+ struct flow_dissector_key_ports tp_max;
} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
struct fl_flow_mask_range {
@@ -103,6 +106,11 @@ struct cls_fl_filter {
struct net_device *hw_dev;
};
+enum fl_endpoint {
+ FLOWER_ENDPOINT_DST,
+ FLOWER_ENDPOINT_SRC
+};
+
static const struct rhashtable_params mask_ht_params = {
.key_offset = offsetof(struct fl_flow_mask, key),
.key_len = sizeof(struct fl_flow_key),
@@ -179,11 +187,86 @@ static void fl_clear_masked_range(struct fl_flow_key *key,
memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
}
+static int fl_range_compare_params(struct cls_fl_filter *filter,
+ struct fl_flow_key *key,
+ struct fl_flow_key *mkey,
+ enum fl_endpoint endpoint)
+{
+ __be16 min_mask, max_mask, min_val, max_val;
+
+ if (endpoint == FLOWER_ENDPOINT_DST) {
+ min_mask = htons(filter->mask->key.tp_min.dst);
+ max_mask = htons(filter->mask->key.tp_max.dst);
+ min_val = htons(filter->key.tp_min.dst);
+ max_val = htons(filter->key.tp_max.dst);
+
+ if (min_mask && max_mask) {
+ if (htons(key->tp.dst) < min_val ||
+ htons(key->tp.dst) > max_val)
+ return -1;
+
+ /* skb does not have min and max values */
+ mkey->tp_min.dst = filter->mkey.tp_min.dst;
+ mkey->tp_max.dst = filter->mkey.tp_max.dst;
+ }
+ } else {
+ min_mask = htons(filter->mask->key.tp_min.src);
+ max_mask = htons(filter->mask->key.tp_max.src);
+ min_val = htons(filter->key.tp_min.src);
+ max_val = htons(filter->key.tp_max.src);
+
+ if (min_mask && max_mask) {
+ if (htons(key->tp.src) < min_val ||
+ htons(key->tp.src) > max_val)
+ return -1;
+
+ /* skb does not have min and max values */
+ mkey->tp_min.src = filter->mkey.tp_min.src;
+ mkey->tp_max.src = filter->mkey.tp_max.src;
+ }
+ }
+ return 0;
+}
+
+static struct cls_fl_filter *fl_lookup_range(struct fl_flow_mask *mask,
+ struct fl_flow_key *mkey,
+ struct fl_flow_key *key)
+{
+ struct cls_fl_filter *filter, *f;
+ int ret;
+
+ list_for_each_entry_rcu(filter, &mask->filters, list) {
+ ret = fl_range_compare_params(filter, key, mkey,
+ FLOWER_ENDPOINT_DST);
+ if (ret < 0)
+ continue;
+
+ ret = fl_range_compare_params(filter, key, mkey,
+ FLOWER_ENDPOINT_SRC);
+ if (ret < 0)
+ continue;
+
+ f = rhashtable_lookup_fast(&mask->ht,
+ fl_key_get_start(mkey, mask),
+ mask->filter_ht_params);
+ if (f)
+ return f;
+ }
+ return NULL;
+}
+
static struct cls_fl_filter *fl_lookup(struct fl_flow_mask *mask,
- struct fl_flow_key *mkey)
+ struct fl_flow_key *mkey,
+ struct fl_flow_key *key, bool is_skb)
{
- return rhashtable_lookup_fast(&mask->ht, fl_key_get_start(mkey, mask),
- mask->filter_ht_params);
+ if ((!(mask->key.tp_min.dst && mask->key.tp_max.dst) &&
+ !(mask->key.tp_min.src && mask->key.tp_max.src)) || !is_skb) {
+ return rhashtable_lookup_fast(&mask->ht,
+ fl_key_get_start(mkey, mask),
+ mask->filter_ht_params);
+ }
+ /* Classify based on range */
+ return fl_lookup_range(mask, mkey, key);
}
static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
@@ -207,8 +290,8 @@ static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
skb_flow_dissect(skb, &mask->dissector, &skb_key, 0);
fl_set_masked_key(&skb_mkey, &skb_key, mask);
+ f = fl_lookup(mask, &skb_mkey, &skb_key, true);
- f = fl_lookup(mask, &skb_mkey);
if (f && !tc_skip_sw(f->flags)) {
*res = f->res;
return tcf_exts_exec(skb, &f->exts, res);
@@ -909,6 +992,23 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
sizeof(key->arp.tha));
}
+ if (key->basic.ip_proto == IPPROTO_TCP ||
+ key->basic.ip_proto == IPPROTO_UDP ||
+ key->basic.ip_proto == IPPROTO_SCTP) {
+ fl_set_key_val(tb, &key->tp_min.dst,
+ TCA_FLOWER_KEY_PORT_DST_MIN, &mask->tp_min.dst,
+ TCA_FLOWER_UNSPEC, sizeof(key->tp_min.dst));
+ fl_set_key_val(tb, &key->tp_max.dst,
+ TCA_FLOWER_KEY_PORT_DST_MAX, &mask->tp_max.dst,
+ TCA_FLOWER_UNSPEC, sizeof(key->tp_max.dst));
+ fl_set_key_val(tb, &key->tp_min.src,
+ TCA_FLOWER_KEY_PORT_SRC_MIN, &mask->tp_min.src,
+ TCA_FLOWER_UNSPEC, sizeof(key->tp_min.src));
+ fl_set_key_val(tb, &key->tp_max.src,
+ TCA_FLOWER_KEY_PORT_SRC_MAX, &mask->tp_max.src,
+ TCA_FLOWER_UNSPEC, sizeof(key->tp_max.src));
+ }
+
if (tb[TCA_FLOWER_KEY_ENC_IPV4_SRC] ||
tb[TCA_FLOWER_KEY_ENC_IPV4_DST]) {
key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
@@ -1026,8 +1126,7 @@ static void fl_init_dissector(struct flow_dissector *dissector,
FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
FL_KEY_SET_IF_MASKED(mask, keys, cnt,
FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
- FL_KEY_SET_IF_MASKED(mask, keys, cnt,
- FLOW_DISSECTOR_KEY_PORTS, tp);
+ FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_PORTS, tp);
FL_KEY_SET_IF_MASKED(mask, keys, cnt,
FLOW_DISSECTOR_KEY_IP, ip);
FL_KEY_SET_IF_MASKED(mask, keys, cnt,
@@ -1227,7 +1326,7 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
goto errout_idr;
if (!tc_skip_sw(fnew->flags)) {
- if (!fold && fl_lookup(fnew->mask, &fnew->mkey)) {
+ if (!fold && fl_lookup(fnew->mask, &fnew->mkey, NULL, false)) {
err = -EEXIST;
goto errout_mask;
}
@@ -1800,6 +1899,27 @@ static int fl_dump_key(struct sk_buff *skb, struct net *net,
sizeof(key->arp.tha))))
goto nla_put_failure;
+ if ((key->basic.ip_proto == IPPROTO_TCP ||
+ key->basic.ip_proto == IPPROTO_UDP ||
+ key->basic.ip_proto == IPPROTO_SCTP) &&
+ (fl_dump_key_val(skb, &key->tp_min.dst,
+ TCA_FLOWER_KEY_PORT_DST_MIN,
+ &mask->tp_min.dst, TCA_FLOWER_UNSPEC,
+ sizeof(key->tp_min.dst)) ||
+ fl_dump_key_val(skb, &key->tp_max.dst,
+ TCA_FLOWER_KEY_PORT_DST_MAX,
+ &mask->tp_max.dst, TCA_FLOWER_UNSPEC,
+ sizeof(key->tp_max.dst)) ||
+ fl_dump_key_val(skb, &key->tp_min.src,
+ TCA_FLOWER_KEY_PORT_SRC_MIN,
+ &mask->tp_min.src, TCA_FLOWER_UNSPEC,
+ sizeof(key->tp_min.src)) ||
+ fl_dump_key_val(skb, &key->tp_max.src,
+ TCA_FLOWER_KEY_PORT_SRC_MAX,
+ &mask->tp_max.src, TCA_FLOWER_UNSPEC,
+ sizeof(key->tp_max.src))))
+ goto nla_put_failure;
+
if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
(fl_dump_key_val(skb, &key->enc_ipv4.src,
TCA_FLOWER_KEY_ENC_IPV4_SRC, &mask->enc_ipv4.src,
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