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[109.115.41.234]) by smtp.gmail.com with ESMTPSA id l18sm20701933wrn.48.2019.10.21.13.10.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Oct 2019 13:10:52 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org Cc: Jay Vosburgh , Veaceslav Falico , Andy Gospodarek , "David S . Miller " , Stanislav Fomichev , Daniel Borkmann , Song Liu , Alexei Starovoitov , Paul Blakey , linux-kernel@vger.kernel.org Subject: [PATCH net-next 2/4] flow_dissector: skip the ICMP dissector for non ICMP packets Date: Mon, 21 Oct 2019 22:09:46 +0200 Message-Id: <20191021200948.23775-3-mcroce@redhat.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191021200948.23775-1-mcroce@redhat.com> References: <20191021200948.23775-1-mcroce@redhat.com> MIME-Version: 1.0 X-MC-Unique: 5syPn9caP6u5y4TLCSQY9A-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org FLOW_DISSECTOR_KEY_ICMP is checked for every packet, not only ICMP ones. Even if the test overhead is probably negligible, move the ICMP dissector code under the big 'switch(ip_proto)' so it gets called only for ICMP packets. Signed-off-by: Matteo Croce --- net/core/flow_dissector.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index affde70dad47..6443fac65ce8 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -203,6 +203,25 @@ __be32 __skb_flow_get_ports(const struct sk_buff *skb,= int thoff, u8 ip_proto, } EXPORT_SYMBOL(__skb_flow_get_ports); =20 +/* If FLOW_DISSECTOR_KEY_ICMP is set, get the Type and Code from an ICMP p= acket + * using skb_flow_get_be16(). + */ +static void __skb_flow_dissect_icmp(const struct sk_buff *skb, +=09=09=09=09 struct flow_dissector *flow_dissector, +=09=09=09=09 void *target_container, +=09=09=09=09 void *data, int thoff, int hlen) +{ +=09struct flow_dissector_key_icmp *key_icmp; + +=09if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ICMP)) +=09=09return; + +=09key_icmp =3D skb_flow_dissector_target(flow_dissector, +=09=09=09=09=09 FLOW_DISSECTOR_KEY_ICMP, +=09=09=09=09=09 target_container); +=09key_icmp->icmp =3D skb_flow_get_be16(skb, thoff, data, hlen); +} + void skb_flow_dissect_meta(const struct sk_buff *skb, =09=09=09 struct flow_dissector *flow_dissector, =09=09=09 void *target_container) @@ -853,7 +872,6 @@ bool __skb_flow_dissect(const struct net *net, =09struct flow_dissector_key_basic *key_basic; =09struct flow_dissector_key_addrs *key_addrs; =09struct flow_dissector_key_ports *key_ports; -=09struct flow_dissector_key_icmp *key_icmp; =09struct flow_dissector_key_tags *key_tags; =09struct flow_dissector_key_vlan *key_vlan; =09struct bpf_prog *attached =3D NULL; @@ -1295,6 +1313,12 @@ bool __skb_flow_dissect(const struct net *net, =09=09=09=09 data, nhoff, hlen); =09=09break; =20 +=09case IPPROTO_ICMP: +=09case IPPROTO_ICMPV6: +=09=09__skb_flow_dissect_icmp(skb, flow_dissector, target_container, +=09=09=09=09=09data, nhoff, hlen); +=09=09break; + =09default: =09=09break; =09} @@ -1308,14 +1332,6 @@ bool __skb_flow_dissect(const struct net *net, =09=09=09=09=09=09=09data, hlen); =09} =20 -=09if (dissector_uses_key(flow_dissector, -=09=09=09 FLOW_DISSECTOR_KEY_ICMP)) { -=09=09key_icmp =3D skb_flow_dissector_target(flow_dissector, -=09=09=09=09=09=09 FLOW_DISSECTOR_KEY_ICMP, -=09=09=09=09=09=09 target_container); -=09=09key_icmp->icmp =3D skb_flow_get_be16(skb, nhoff, data, hlen); -=09} - =09/* Process result of IP proto processing */ =09switch (fdret) { =09case FLOW_DISSECT_RET_PROTO_AGAIN: --=20 2.21.0