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Date: Sat, 8 Jun 2013 12:56:03 +0200
From: Daniel Borkmann <dborkman@...hat.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: [PATCH net-next] net: udp4: move GSO functions to udp_offload
Similarly to TCP offloading and UDPv6 offloading, move all related
UDPv4 functions to udp_offload.c to make things more explicit. Also,
by this, we can make those functions static.
Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
---
include/net/udp.h | 7 ++--
net/ipv4/Makefile | 2 +-
net/ipv4/af_inet.c | 9 +----
net/ipv4/udp.c | 75 +------------------------------------
net/ipv4/udp_offload.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 108 insertions(+), 85 deletions(-)
create mode 100644 net/ipv4/udp_offload.c
diff --git a/include/net/udp.h b/include/net/udp.h
index 065f379..b30a71a 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -187,6 +187,8 @@ extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
extern int udp_disconnect(struct sock *sk, int flags);
extern unsigned int udp_poll(struct file *file, struct socket *sock,
poll_table *wait);
+extern struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
+ netdev_features_t features);
extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen);
extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
@@ -262,11 +264,10 @@ extern int udp4_proc_init(void);
extern void udp4_proc_exit(void);
#endif
+extern int udpv4_offload_init(void);
+
extern void udp_init(void);
-extern int udp4_ufo_send_check(struct sk_buff *skb);
-extern struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
- netdev_features_t features);
extern void udp_encap_enable(void);
#if IS_ENABLED(CONFIG_IPV6)
extern void udpv6_encap_enable(void);
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index 4d3e138..a9dd333 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -9,7 +9,7 @@ obj-y := route.o inetpeer.o protocol.o \
tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \
tcp_minisocks.o tcp_cong.o tcp_metrics.o tcp_fastopen.o \
tcp_offload.o datagram.o raw.o udp.o udplite.o \
- arp.o icmp.o devinet.o af_inet.o igmp.o \
+ udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \
fib_frontend.o fib_semantics.o fib_trie.o \
inet_fragment.o ping.o
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 7b51429..5598b06 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1566,13 +1566,6 @@ static const struct net_protocol udp_protocol = {
.netns_ok = 1,
};
-static const struct net_offload udp_offload = {
- .callbacks = {
- .gso_send_check = udp4_ufo_send_check,
- .gso_segment = udp4_ufo_fragment,
- },
-};
-
static const struct net_protocol icmp_protocol = {
.handler = icmp_rcv,
.err_handler = icmp_err,
@@ -1672,7 +1665,7 @@ static int __init ipv4_offload_init(void)
/*
* Add offloads
*/
- if (inet_add_offload(&udp_offload, IPPROTO_UDP) < 0)
+ if (udpv4_offload_init() < 0)
pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
if (tcpv4_offload_init() < 0)
pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index c7338ec..aef854f 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2286,29 +2286,8 @@ void __init udp_init(void)
sysctl_udp_wmem_min = SK_MEM_QUANTUM;
}
-int udp4_ufo_send_check(struct sk_buff *skb)
-{
- if (!pskb_may_pull(skb, sizeof(struct udphdr)))
- return -EINVAL;
-
- if (likely(!skb->encapsulation)) {
- const struct iphdr *iph;
- struct udphdr *uh;
-
- iph = ip_hdr(skb);
- uh = udp_hdr(skb);
-
- uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
- IPPROTO_UDP, 0);
- skb->csum_start = skb_transport_header(skb) - skb->head;
- skb->csum_offset = offsetof(struct udphdr, check);
- skb->ip_summed = CHECKSUM_PARTIAL;
- }
- return 0;
-}
-
-static struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
- netdev_features_t features)
+struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
+ netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EINVAL);
int mac_len = skb->mac_len;
@@ -2367,53 +2346,3 @@ static struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
out:
return segs;
}
-
-struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
- netdev_features_t features)
-{
- struct sk_buff *segs = ERR_PTR(-EINVAL);
- unsigned int mss;
- mss = skb_shinfo(skb)->gso_size;
- if (unlikely(skb->len <= mss))
- goto out;
-
- if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
- /* Packet is from an untrusted source, reset gso_segs. */
- int type = skb_shinfo(skb)->gso_type;
-
- if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY |
- SKB_GSO_UDP_TUNNEL |
- SKB_GSO_GRE | SKB_GSO_MPLS) ||
- !(type & (SKB_GSO_UDP))))
- goto out;
-
- skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
-
- segs = NULL;
- goto out;
- }
-
- /* Fragment the skb. IP headers of the fragments are updated in
- * inet_gso_segment()
- */
- if (skb->encapsulation && skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL)
- segs = skb_udp_tunnel_segment(skb, features);
- else {
- int offset;
- __wsum csum;
-
- /* Do software UFO. Complete and fill in the UDP checksum as
- * HW cannot do checksum of UDP packets sent as multiple
- * IP fragments.
- */
- offset = skb_checksum_start_offset(skb);
- csum = skb_checksum(skb, offset, skb->len - offset, 0);
- offset += skb->csum_offset;
- *(__sum16 *)(skb->data + offset) = csum_fold(csum);
- skb->ip_summed = CHECKSUM_NONE;
-
- segs = skb_segment(skb, features);
- }
-out:
- return segs;
-}
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
new file mode 100644
index 0000000..f35ecca
--- /dev/null
+++ b/net/ipv4/udp_offload.c
@@ -0,0 +1,100 @@
+/*
+ * IPV4 GSO/GRO offload support
+ * Linux INET implementation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * UDPv4 GSO support
+ */
+
+#include <linux/skbuff.h>
+#include <net/udp.h>
+#include <net/protocol.h>
+
+static int udp4_ufo_send_check(struct sk_buff *skb)
+{
+ if (!pskb_may_pull(skb, sizeof(struct udphdr)))
+ return -EINVAL;
+
+ if (likely(!skb->encapsulation)) {
+ const struct iphdr *iph;
+ struct udphdr *uh;
+
+ iph = ip_hdr(skb);
+ uh = udp_hdr(skb);
+
+ uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
+ IPPROTO_UDP, 0);
+ skb->csum_start = skb_transport_header(skb) - skb->head;
+ skb->csum_offset = offsetof(struct udphdr, check);
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ }
+
+ return 0;
+}
+
+static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
+ netdev_features_t features)
+{
+ struct sk_buff *segs = ERR_PTR(-EINVAL);
+ unsigned int mss;
+
+ mss = skb_shinfo(skb)->gso_size;
+ if (unlikely(skb->len <= mss))
+ goto out;
+
+ if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
+ /* Packet is from an untrusted source, reset gso_segs. */
+ int type = skb_shinfo(skb)->gso_type;
+
+ if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY |
+ SKB_GSO_UDP_TUNNEL |
+ SKB_GSO_GRE | SKB_GSO_MPLS) ||
+ !(type & (SKB_GSO_UDP))))
+ goto out;
+
+ skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
+
+ segs = NULL;
+ goto out;
+ }
+
+ /* Fragment the skb. IP headers of the fragments are updated in
+ * inet_gso_segment()
+ */
+ if (skb->encapsulation && skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL)
+ segs = skb_udp_tunnel_segment(skb, features);
+ else {
+ int offset;
+ __wsum csum;
+
+ /* Do software UFO. Complete and fill in the UDP checksum as
+ * HW cannot do checksum of UDP packets sent as multiple
+ * IP fragments.
+ */
+ offset = skb_checksum_start_offset(skb);
+ csum = skb_checksum(skb, offset, skb->len - offset, 0);
+ offset += skb->csum_offset;
+ *(__sum16 *)(skb->data + offset) = csum_fold(csum);
+ skb->ip_summed = CHECKSUM_NONE;
+
+ segs = skb_segment(skb, features);
+ }
+out:
+ return segs;
+}
+
+static const struct net_offload udpv4_offload = {
+ .callbacks = {
+ .gso_send_check = udp4_ufo_send_check,
+ .gso_segment = udp4_ufo_fragment,
+ },
+};
+
+int __init udpv4_offload_init(void)
+{
+ return inet_add_offload(&udpv4_offload, IPPROTO_UDP);
+}
--
1.7.11.7
--
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