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Date: Fri, 09 Nov 2018 16:11:10 -0800
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 v3] net: sched: cls_flower: Classify packets using
port ranges
Added support in tc flower 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
v3:
1. Moved new fields in UAPI enum to the end of enum.
2. Removed couple of empty lines.
v2:
Addressed Jiri's comments:
1. Added separate functions for dst and src comparisons.
2. Removed endpoint enum.
3. Added new bit TCA_FLOWER_FLAGS_RANGE to decide normal/range
lookup.
4. Cleaned up fl_lookup function.
Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
---
include/uapi/linux/pkt_cls.h | 7 ++
net/sched/cls_flower.c | 132 ++++++++++++++++++++++++++++++++++++++++--
2 files changed, 133 insertions(+), 6 deletions(-)
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 401d0c1..95d0db2 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -485,6 +485,11 @@ enum {
TCA_FLOWER_IN_HW_COUNT,
+ 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_MAX,
};
@@ -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/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 9aada2d..7780106 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -55,6 +55,8 @@ 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 {
@@ -65,6 +67,7 @@ struct fl_flow_mask_range {
struct fl_flow_mask {
struct fl_flow_key key;
struct fl_flow_mask_range range;
+ u32 flags;
struct rhash_head ht_node;
struct rhashtable ht;
struct rhashtable_params filter_ht_params;
@@ -179,13 +182,89 @@ static void fl_clear_masked_range(struct fl_flow_key *key,
memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
}
-static struct cls_fl_filter *fl_lookup(struct fl_flow_mask *mask,
- struct fl_flow_key *mkey)
+static bool fl_range_port_dst_cmp(struct cls_fl_filter *filter,
+ struct fl_flow_key *key,
+ struct fl_flow_key *mkey)
+{
+ __be16 min_mask, max_mask, min_val, max_val;
+
+ 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 false;
+
+ /* 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;
+ }
+ return true;
+}
+
+static bool fl_range_port_src_cmp(struct cls_fl_filter *filter,
+ struct fl_flow_key *key,
+ struct fl_flow_key *mkey)
+{
+ __be16 min_mask, max_mask, min_val, max_val;
+
+ 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 false;
+
+ /* 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 true;
+}
+
+static struct cls_fl_filter *__fl_lookup(struct fl_flow_mask *mask,
+ struct fl_flow_key *mkey)
{
return rhashtable_lookup_fast(&mask->ht, fl_key_get_start(mkey, mask),
mask->filter_ht_params);
}
+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;
+
+ list_for_each_entry_rcu(filter, &mask->filters, list) {
+ if (!fl_range_port_dst_cmp(filter, key, mkey))
+ continue;
+
+ if (!fl_range_port_src_cmp(filter, key, mkey))
+ continue;
+
+ f = __fl_lookup(mask, mkey);
+ 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 *key)
+{
+ if ((mask->flags & TCA_FLOWER_MASK_FLAGS_RANGE))
+ return fl_lookup_range(mask, mkey, key);
+
+ return __fl_lookup(mask, mkey);
+}
+
static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res)
{
@@ -208,7 +287,7 @@ static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
fl_set_masked_key(&skb_mkey, &skb_key, mask);
- f = fl_lookup(mask, &skb_mkey);
+ f = fl_lookup(mask, &skb_mkey, &skb_key);
if (f && !tc_skip_sw(f->flags)) {
*res = f->res;
return tcf_exts_exec(skb, &f->exts, res);
@@ -909,6 +988,23 @@ 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 +1122,7 @@ 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,
@@ -1074,6 +1169,10 @@ static struct fl_flow_mask *fl_create_new_mask(struct cls_fl_head *head,
fl_mask_copy(newmask, mask);
+ if ((newmask->key.tp_min.dst && newmask->key.tp_max.dst) ||
+ (newmask->key.tp_min.src && newmask->key.tp_max.src))
+ newmask->flags |= TCA_FLOWER_MASK_FLAGS_RANGE;
+
err = fl_init_mask_hashtable(newmask);
if (err)
goto errout_free;
@@ -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)) {
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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