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Date: Sat, 3 Dec 2016 11:49:18 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Simon Horman <simon.horman@...ronome.com>
Cc: David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
Jay Vosburgh <j.vosburgh@...il.com>,
Veaceslav Falico <vfalico@...il.com>,
Andy Gospodarek <andy@...yhouse.net>,
Jamal Hadi Salim <jhs@...atatu.com>,
Jiri Pirko <jiri@...lanox.com>
Subject: Re: [PATCH v2 net-next 1/2] flow dissector: ICMP support
Fri, Dec 02, 2016 at 09:31:41PM CET, simon.horman@...ronome.com wrote:
>Allow dissection of ICMP(V6) type and code. This re-uses transport layer
>port dissection code as although ICMP is not a transport protocol and their
>type and code are not ports this allows sharing of both code and storage.
>
>Signed-off-by: Simon Horman <simon.horman@...ronome.com>
>---
> drivers/net/bonding/bond_main.c | 6 +++--
> include/linux/skbuff.h | 5 +++++
> include/net/flow_dissector.h | 50 ++++++++++++++++++++++++++++++++++++++---
> net/core/flow_dissector.c | 34 +++++++++++++++++++++++++---
> net/sched/cls_flow.c | 4 ++--
> 5 files changed, 89 insertions(+), 10 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 8029dd4912b6..a6f75cfb2bf7 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -3181,7 +3181,8 @@ static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
> } else {
> return false;
> }
>- if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
>+ if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 &&
>+ proto >= 0 && !skb_flow_is_icmp_any(skb, proto))
> fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
>
> return true;
>@@ -3209,7 +3210,8 @@ u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
> return bond_eth_hash(skb);
>
> if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
>- bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
>+ bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23 ||
>+ flow_keys_are_icmp_any(&flow))
> hash = bond_eth_hash(skb);
> else
> hash = (__force u32)flow.ports.ports;
>diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
>index 9c535fbccf2c..44a8f69a9198 100644
>--- a/include/linux/skbuff.h
>+++ b/include/linux/skbuff.h
>@@ -1094,6 +1094,11 @@ u32 __skb_get_poff(const struct sk_buff *skb, void *data,
> __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
> void *data, int hlen_proto);
>
>+static inline bool skb_flow_is_icmp_any(const struct sk_buff *skb, u8 ip_proto)
>+{
>+ return flow_protos_are_icmp_any(skb->protocol, ip_proto);
>+}
>+
> static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
> int thoff, u8 ip_proto)
> {
>diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
>index c4f31666afd2..5540dfa18872 100644
>--- a/include/net/flow_dissector.h
>+++ b/include/net/flow_dissector.h
>@@ -2,6 +2,7 @@
> #define _NET_FLOW_DISSECTOR_H
>
> #include <linux/types.h>
>+#include <linux/in.h>
> #include <linux/in6.h>
> #include <uapi/linux/if_ether.h>
>
>@@ -89,10 +90,15 @@ struct flow_dissector_key_addrs {
> };
>
> /**
>- * flow_dissector_key_tp_ports:
>- * @ports: port numbers of Transport header
>+ * flow_dissector_key_ports:
>+ * @ports: port numbers of Transport header or
>+ * type and code of ICMP header
>+ * ports: source (high) and destination (low) port numbers
> * src: source port number
> * dst: destination port number
>+ * icmp: ICMP type (high) and code (low)
>+ * type: ICMP type
>+ * type: ICMP code
> */
> struct flow_dissector_key_ports {
> union {
>@@ -101,6 +107,11 @@ struct flow_dissector_key_ports {
> __be16 src;
> __be16 dst;
> };
>+ __be16 icmp;
>+ struct {
>+ u8 type;
>+ u8 code;
>+ };
Digging into this a bit more. I think it would be much nice not to mix
up l4 ports and icmp stuff.
How about to have FLOW_DISSECTOR_KEY_ICMP
and
struct flow_dissector_key_icmp {
u8 type;
u8 code;
};
The you can make this structure and struct flow_dissector_key_ports into
an union in struct flow_keys.
Looks much cleaner to me.
> };
> };
>
>@@ -188,9 +199,42 @@ struct flow_keys_digest {
> void make_flow_keys_digest(struct flow_keys_digest *digest,
> const struct flow_keys *flow);
>
>+static inline bool flow_protos_are_icmpv4(__be16 n_proto, u8 ip_proto)
>+{
>+ return n_proto == htons(ETH_P_IP) && ip_proto == IPPROTO_ICMP;
>+}
>+
>+static inline bool flow_protos_are_icmpv6(__be16 n_proto, u8 ip_proto)
>+{
>+ return n_proto == htons(ETH_P_IPV6) && ip_proto == IPPROTO_ICMPV6;
>+}
>+
>+static inline bool flow_protos_are_icmp_any(__be16 n_proto, u8 ip_proto)
>+{
>+ return flow_protos_are_icmpv4(n_proto, ip_proto) ||
>+ flow_protos_are_icmpv6(n_proto, ip_proto);
>+}
>+
>+static inline bool flow_basic_key_is_icmpv4(const struct flow_dissector_key_basic *basic)
>+{
>+ return flow_protos_are_icmpv4(basic->n_proto, basic->ip_proto);
>+}
>+
>+static inline bool flow_basic_key_is_icmpv6(const struct flow_dissector_key_basic *basic)
>+{
>+ return flow_protos_are_icmpv6(basic->n_proto, basic->ip_proto);
>+}
>+
>+static inline bool flow_keys_are_icmp_any(const struct flow_keys *keys)
>+{
>+ return flow_protos_are_icmp_any(keys->basic.n_proto,
>+ keys->basic.ip_proto);
>+}
>+
> static inline bool flow_keys_have_l4(const struct flow_keys *keys)
> {
>- return (keys->ports.ports || keys->tags.flow_label);
>+ return (!flow_keys_are_icmp_any(keys) && keys->ports.ports) ||
>+ keys->tags.flow_label;
> }
>
> u32 flow_hash_from_keys(struct flow_keys *keys);
>diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
>index 1eb6f949e5b2..0584b4bb4390 100644
>--- a/net/core/flow_dissector.c
>+++ b/net/core/flow_dissector.c
>@@ -58,6 +58,28 @@ void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
> EXPORT_SYMBOL(skb_flow_dissector_init);
>
> /**
>+ * skb_flow_get_be16 - extract be16 entity
>+ * @skb: sk_buff to extract from
>+ * @poff: offset to extract at
>+ * @data: raw buffer pointer to the packet
>+ * @hlen: packet header length
>+ *
>+ * The function will try to retrieve a be32 entity at
>+ * offset poff
>+ */
>+__be16 skb_flow_get_be16(const struct sk_buff *skb, int poff, void *data,
>+ int hlen)
>+{
>+ __be16 *u, _u;
>+
>+ u = __skb_header_pointer(skb, poff, sizeof(_u), data, hlen, &_u);
>+ if (u)
>+ return *u;
>+
>+ return 0;
>+}
>+
>+/**
> * __skb_flow_get_ports - extract the upper layer ports and return them
> * @skb: sk_buff to extract the ports from
> * @thoff: transport header offset
>@@ -542,8 +564,13 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
> key_ports = skb_flow_dissector_target(flow_dissector,
> FLOW_DISSECTOR_KEY_PORTS,
> target_container);
>- key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
>- data, hlen);
>+ if (flow_protos_are_icmp_any(proto, ip_proto))
>+ key_ports->icmp = skb_flow_get_be16(skb, nhoff, data,
>+ hlen);
>+ else
>+ key_ports->ports = __skb_flow_get_ports(skb, nhoff,
>+ ip_proto, data,
>+ hlen);
> }
>
> out_good:
>@@ -718,7 +745,8 @@ void make_flow_keys_digest(struct flow_keys_digest *digest,
>
> data->n_proto = flow->basic.n_proto;
> data->ip_proto = flow->basic.ip_proto;
>- data->ports = flow->ports.ports;
>+ if (flow_keys_have_l4(flow))
>+ data->ports = flow->ports.ports;
> data->src = flow->addrs.v4addrs.src;
> data->dst = flow->addrs.v4addrs.dst;
> }
>diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
>index e39672394c7b..a1a7ae71aa62 100644
>--- a/net/sched/cls_flow.c
>+++ b/net/sched/cls_flow.c
>@@ -96,7 +96,7 @@ static u32 flow_get_proto(const struct sk_buff *skb,
> static u32 flow_get_proto_src(const struct sk_buff *skb,
> const struct flow_keys *flow)
> {
>- if (flow->ports.ports)
>+ if (!flow_keys_are_icmp_any(flow) && flow->ports.ports)
> return ntohs(flow->ports.src);
>
> return addr_fold(skb->sk);
>@@ -105,7 +105,7 @@ static u32 flow_get_proto_src(const struct sk_buff *skb,
> static u32 flow_get_proto_dst(const struct sk_buff *skb,
> const struct flow_keys *flow)
> {
>- if (flow->ports.ports)
>+ if (!flow_keys_are_icmp_any(flow) && flow->ports.ports)
> return ntohs(flow->ports.dst);
>
> return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
>--
>2.7.0.rc3.207.g0ac5344
>
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