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net: udp4: move GSO functions to udp_offload

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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@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-06-08 12:56:03 +02:00 committed by David S. Miller
parent 946d3bd723
commit da5bab079f
5 changed files with 108 additions and 85 deletions
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7
include/net/udp.h
View File

@ -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);

2
net/ipv4/Makefile
View File

@ -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

9
net/ipv4/af_inet.c
View File

@ -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__);

75
net/ipv4/udp.c
View File

@ -2290,29 +2290,8 @@ 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;
@ -2371,53 +2350,3 @@ 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;
}

100
net/ipv4/udp_offload.c Normal file
View File

@ -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);
}