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Message-ID: <20161207113914.GB1987@nanopsycho>
Date: Wed, 7 Dec 2016 12:39:14 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Simon Horman <simon.horman@...ronome.com>
Cc: Jiri Pirko <jiri@...lanox.com>, Tom Herbert <tom@...bertland.com>,
David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 2/2] net/sched: cls_flower: Support matching
on ICMP type and code
Wed, Dec 07, 2016 at 12:34:12PM CET, simon.horman@...ronome.com wrote:
>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@...ronome.com>
>---
>v3
>* Use separate dissector key FLOW_DISSECTOR_KEY_ICMP
>* Use separate structure to hold icmp fields, this does not share
> storage with ports
>
>v2
>* Move helpers to another patch
>---
> include/uapi/linux/pkt_cls.h | 10 +++++++++
> net/sched/cls_flower.c | 49 ++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 59 insertions(+)
>
>diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
>index 1adc0b654996..884c5aa515c4 100644
>--- a/include/uapi/linux/pkt_cls.h
>+++ b/include/uapi/linux/pkt_cls.h
>@@ -458,6 +458,16 @@ enum {
> TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK, /* be16 */
> TCA_FLOWER_KEY_ENC_UDP_DST_PORT, /* be16 */
> TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK, /* be16 */
>+
>+ TCA_FLOWER_KEY_ICMPV4_CODE, /* u8 */
>+ TCA_FLOWER_KEY_ICMPV4_CODE_MASK,/* u8 */
>+ TCA_FLOWER_KEY_ICMPV4_TYPE, /* u8 */
>+ TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,/* u8 */
>+ TCA_FLOWER_KEY_ICMPV6_CODE, /* u8 */
>+ TCA_FLOWER_KEY_ICMPV6_CODE_MASK,/* u8 */
>+ TCA_FLOWER_KEY_ICMPV6_TYPE, /* u8 */
>+ TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,/* u8 */
>+
> __TCA_FLOWER_MAX,
> };
>
>diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
>index 29a9e6d9f274..56df0368125a 100644
>--- a/net/sched/cls_flower.c
>+++ b/net/sched/cls_flower.c
>@@ -39,6 +39,7 @@ struct fl_flow_key {
> struct flow_dissector_key_ipv6_addrs ipv6;
> };
> struct flow_dissector_key_ports tp;
>+ struct flow_dissector_key_icmp icmp;
> struct flow_dissector_key_keyid enc_key_id;
> union {
> struct flow_dissector_key_ipv4_addrs enc_ipv4;
>@@ -386,6 +387,14 @@ static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
> [TCA_FLOWER_KEY_ENC_UDP_SRC_PORT_MASK] = { .type = NLA_U16 },
> [TCA_FLOWER_KEY_ENC_UDP_DST_PORT] = { .type = NLA_U16 },
> [TCA_FLOWER_KEY_ENC_UDP_DST_PORT_MASK] = { .type = NLA_U16 },
>+ [TCA_FLOWER_KEY_ICMPV4_TYPE] = { .type = NLA_U8 },
>+ [TCA_FLOWER_KEY_ICMPV4_TYPE_MASK] = { .type = NLA_U8 },
>+ [TCA_FLOWER_KEY_ICMPV4_CODE] = { .type = NLA_U8 },
>+ [TCA_FLOWER_KEY_ICMPV4_CODE_MASK] = { .type = NLA_U8 },
>+ [TCA_FLOWER_KEY_ICMPV6_TYPE] = { .type = NLA_U8 },
>+ [TCA_FLOWER_KEY_ICMPV6_TYPE_MASK] = { .type = NLA_U8 },
>+ [TCA_FLOWER_KEY_ICMPV6_CODE] = { .type = NLA_U8 },
>+ [TCA_FLOWER_KEY_ICMPV6_CODE_MASK] = { .type = NLA_U8 },
> };
>
> static void fl_set_key_val(struct nlattr **tb,
>@@ -502,6 +511,24 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
> fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_SCTP_DST,
> &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
> sizeof(key->tp.dst));
>+ } else if (flow_basic_key_is_icmpv4(&key->basic)) {
Please just use:
key->basic.n_proto and key->basic.ip_proto
like the rest of the code. And drop the helpers.
The rest looks fine to me.
>+ fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV4_TYPE,
>+ &mask->icmp.type,
>+ TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,
>+ sizeof(key->icmp.type));
>+ fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV4_CODE,
>+ &mask->icmp.code,
>+ TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
>+ sizeof(key->icmp.code));
>+ } else if (flow_basic_key_is_icmpv6(&key->basic)) {
>+ fl_set_key_val(tb, &key->icmp.type, TCA_FLOWER_KEY_ICMPV6_TYPE,
>+ &mask->icmp.type,
>+ TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,
>+ sizeof(key->icmp.type));
>+ fl_set_key_val(tb, &key->icmp.code, TCA_FLOWER_KEY_ICMPV4_CODE,
>+ &mask->icmp.code,
>+ TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
>+ sizeof(key->icmp.code));
> }
>
> if (tb[TCA_FLOWER_KEY_ENC_IPV4_SRC] ||
>@@ -612,6 +639,8 @@ static void fl_init_dissector(struct cls_fl_head *head,
> FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
> FLOW_DISSECTOR_KEY_PORTS, tp);
> FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
>+ FLOW_DISSECTOR_KEY_ICMP, icmp);
>+ FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
> FLOW_DISSECTOR_KEY_VLAN, vlan);
> FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
> FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
>@@ -977,6 +1006,26 @@ static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
> &mask->tp.dst, TCA_FLOWER_KEY_SCTP_DST_MASK,
> sizeof(key->tp.dst))))
> goto nla_put_failure;
>+ else if (flow_basic_key_is_icmpv4(&key->basic) &&
>+ (fl_dump_key_val(skb, &key->icmp.type,
>+ TCA_FLOWER_KEY_ICMPV4_TYPE, &mask->icmp.type,
>+ TCA_FLOWER_KEY_ICMPV4_TYPE_MASK,
>+ sizeof(key->icmp.type)) ||
>+ fl_dump_key_val(skb, &key->icmp.code,
>+ TCA_FLOWER_KEY_ICMPV4_CODE, &mask->icmp.code,
>+ TCA_FLOWER_KEY_ICMPV4_CODE_MASK,
>+ sizeof(key->icmp.code))))
>+ goto nla_put_failure;
>+ else if (flow_basic_key_is_icmpv6(&key->basic) &&
>+ (fl_dump_key_val(skb, &key->icmp.type,
>+ TCA_FLOWER_KEY_ICMPV6_TYPE, &mask->icmp.type,
>+ TCA_FLOWER_KEY_ICMPV6_TYPE_MASK,
>+ sizeof(key->icmp.type)) ||
>+ fl_dump_key_val(skb, &key->icmp.code,
>+ TCA_FLOWER_KEY_ICMPV6_CODE, &mask->icmp.code,
>+ TCA_FLOWER_KEY_ICMPV6_CODE_MASK,
>+ sizeof(key->icmp.code))))
>+ goto nla_put_failure;
>
> if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
> (fl_dump_key_val(skb, &key->enc_ipv4.src,
>--
>2.7.0.rc3.207.g0ac5344
>
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