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Message-ID: <20161012232547.2383961-4-tom@herbertland.com>
Date: Wed, 12 Oct 2016 16:25:45 -0700
From: Tom Herbert <tom@...bertland.com>
To: <davem@...emloft.net>, <netdev@...r.kernel.org>
CC: <kernel-team@...com>
Subject: [PATCH net-next 3/5] udp: Add UDP flow dissection functions to IPv4 and IPv6
Add per protocol offload callbacks for flow_dissect to UDP for
IPv4 and IPv6. The callback functions extract the port number
information and with the packet addresses (given in an argument with
type flow_dissector_key_addrs) it performs a lookup on the UDP
socket. If a socket is found and flow_dissect is set for the
socket then that function is called.
Signed-off-by: Tom Herbert <tom@...bertland.com>
---
net/ipv4/udp_offload.c | 39 +++++++++++++++++++++++++++++++++++++++
net/ipv6/udp_offload.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+)
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index f9333c9..c7753ba 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -377,11 +377,50 @@ static int udp4_gro_complete(struct sk_buff *skb, int nhoff)
return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb);
}
+/* Assumes rcu lock is held */
+static int udp4_flow_dissect(const struct sk_buff *skb, void *data, int hlen,
+ int *nhoff, u8 *ip_proto, __be16 *proto,
+ struct flow_dissector_key_addrs *key_addrs)
+{
+ u16 _ports[2], *ports;
+ struct net *net;
+ struct sock *sk;
+ int dif = -1;
+
+ /* See if there is a flow dissector in the UDP socket */
+
+ if (skb->dev) {
+ net = dev_net(skb->dev);
+ dif = skb->dev->ifindex;
+ } else if (skb->sk) {
+ net = sock_net(skb->sk);
+ } else {
+ return FLOW_DIS_RET_PASS;
+ }
+
+ ports = __skb_header_pointer(skb, *nhoff, sizeof(_ports),
+ data, hlen, &_ports);
+ if (!ports)
+ return FLOW_DIS_RET_BAD;
+
+ sk = udp4_lib_lookup_noref(net,
+ key_addrs->v4addrs.src, ports[0],
+ key_addrs->v4addrs.dst, ports[1],
+ dif);
+
+ if (sk && udp_sk(sk)->flow_dissect)
+ return udp_sk(sk)->flow_dissect(sk, skb, data, hlen, nhoff,
+ ip_proto, proto);
+ else
+ return FLOW_DIS_RET_PASS;
+}
+
static const struct net_offload udpv4_offload = {
.callbacks = {
.gso_segment = udp4_ufo_fragment,
.gro_receive = udp4_gro_receive,
.gro_complete = udp4_gro_complete,
+ .flow_dissect = udp4_flow_dissect,
},
};
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index ac858c4..b3f4a6c 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -163,11 +163,49 @@ static int udp6_gro_complete(struct sk_buff *skb, int nhoff)
return udp_gro_complete(skb, nhoff, udp6_lib_lookup_skb);
}
+/* Assumes rcu lock is held */
+static int udp6_flow_dissect(const struct sk_buff *skb, void *data, int hlen,
+ int *nhoff, u8 *ip_proto, __be16 *proto,
+ const struct flow_dissector_key_addrs *key_addrs)
+{
+ u16 _ports[2], *ports;
+ struct net *net;
+ struct sock *sk;
+ int dif = -1;
+
+ /* See if there is a flow dissector in the UDP socket */
+
+ if (skb->dev) {
+ net = dev_net(skb->dev);
+ dif = skb->dev->ifindex;
+ } else if (skb->sk) {
+ net = sock_net(skb->sk);
+ } else {
+ return FLOW_DIS_RET_PASS;
+ }
+
+ ports = __skb_header_pointer(skb, *nhoff, sizeof(_ports),
+ data, hlen, &_ports);
+ if (!ports)
+ return FLOW_DIS_RET_BAD;
+
+ sk = udp6_lib_lookup_noref(net,
+ &key_addrs->v6addrs.src, ports[0],
+ &key_addrs->v6addrs.dst, ports[1],
+ dif);
+
+ if (sk && udp_sk(sk)->flow_dissect)
+ return udp_sk(sk)->flow_dissect(sk, skb, data, hlen, nhoff,
+ ip_proto, proto);
+ return FLOW_DIS_RET_PASS;
+}
+
static const struct net_offload udpv6_offload = {
.callbacks = {
.gso_segment = udp6_ufo_fragment,
.gro_receive = udp6_gro_receive,
.gro_complete = udp6_gro_complete,
+ .flow_dissect = udp6_flow_dissect,
},
};
--
2.9.3
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