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udp: additional GRO support 

Implement GRO for UDPv6. Add UDP checksum verification in gro_receive
for both UDP4 and UDP6 calling skb_gro_checksum_validate_zero_check.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2014-08-22 13:34:44 -07:00 committed by David S. Miller
parent 149d0774a7
commit 57c67ff4bd
4 changed files with 96 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
include/net/udp.h
View File

@ -158,6 +158,24 @@ static inline __sum16 udp_v4_check(int len, __be32 saddr,
void udp_set_csum(bool nocheck, struct sk_buff *skb,
__be32 saddr, __be32 daddr, int len);
struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
struct udphdr *uh);
int udp_gro_complete(struct sk_buff *skb, int nhoff);
static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb)
{
struct udphdr *uh;
unsigned int hlen, off;
off = skb_gro_offset(skb);
hlen = off + sizeof(*uh);
uh = skb_gro_header_fast(skb, off);
if (skb_gro_header_hard(skb, hlen))
uh = skb_gro_header_slow(skb, hlen, off);
return uh;
}
/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
static inline void udp_lib_hash(struct sock *sk)
{

1
net/ipv4/udp.c
View File

@ -99,6 +99,7 @@
#include <linux/slab.h>
#include <net/tcp_states.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <net/net_namespace.h>

61
net/ipv4/udp_offload.c
View File

@ -228,29 +228,22 @@ unlock:
}
EXPORT_SYMBOL(udp_del_offload);
static struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb)
struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
struct udphdr *uh)
{
struct udp_offload_priv *uo_priv;
struct sk_buff *p, **pp = NULL;
struct udphdr *uh, *uh2;
unsigned int hlen, off;
struct udphdr *uh2;
unsigned int off = skb_gro_offset(skb);
int flush = 1;
if (NAPI_GRO_CB(skb)->udp_mark ||
(!skb->encapsulation && skb->ip_summed != CHECKSUM_COMPLETE))
(!skb->encapsulation && !NAPI_GRO_CB(skb)->csum_valid))
goto out;
/* mark that this skb passed once through the udp gro layer */
NAPI_GRO_CB(skb)->udp_mark = 1;
off = skb_gro_offset(skb);
hlen = off + sizeof(*uh);
uh = skb_gro_header_fast(skb, off);
if (skb_gro_header_hard(skb, hlen)) {
uh = skb_gro_header_slow(skb, hlen, off);
if (unlikely(!uh))
goto out;
}
NAPI_GRO_CB(skb)->encapsulation++;
rcu_read_lock();
uo_priv = rcu_dereference(udp_offload_base);
@ -269,7 +262,12 @@ unflush:
continue;
uh2 = (struct udphdr *)(p->data + off);
if ((*(u32 *)&uh->source != *(u32 *)&uh2->source)) {
/* Match ports and either checksums are either both zero
* or nonzero.
*/
if ((*(u32 *)&uh->source != *(u32 *)&uh2->source) ||
(!uh->check ^ !uh2->check)) {
NAPI_GRO_CB(p)->same_flow = 0;
continue;
}
@ -286,7 +284,24 @@ out:
return pp;
}
static int udp_gro_complete(struct sk_buff *skb, int nhoff)
static struct sk_buff **udp4_gro_receive(struct sk_buff **head,
struct sk_buff *skb)
{
struct udphdr *uh = udp_gro_udphdr(skb);
/* Don't bother verifying checksum if we're going to flush anyway. */
if (unlikely(!uh) ||
(!NAPI_GRO_CB(skb)->flush &&
skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
inet_gro_compute_pseudo))) {
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
}
return udp_gro_receive(head, skb, uh);
}
int udp_gro_complete(struct sk_buff *skb, int nhoff)
{
struct udp_offload_priv *uo_priv;
__be16 newlen = htons(skb->len - nhoff);
@ -311,12 +326,24 @@ static int udp_gro_complete(struct sk_buff *skb, int nhoff)
return err;
}
int udp4_gro_complete(struct sk_buff *skb, int nhoff)
{
const struct iphdr *iph = ip_hdr(skb);
struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
if (uh->check)
uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,
iph->daddr, 0);
return udp_gro_complete(skb, nhoff);
}
static const struct net_offload udpv4_offload = {
.callbacks = {
.gso_send_check = udp4_ufo_send_check,
.gso_segment = udp4_ufo_fragment,
.gro_receive = udp_gro_receive,
.gro_complete = udp_gro_complete,
.gro_receive = udp4_gro_receive,
.gro_complete = udp4_gro_complete,
},
};

33
net/ipv6/udp_offload.c
View File

@ -10,6 +10,7 @@
* UDPv6 GSO support
*/
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <net/protocol.h>
#include <net/ipv6.h>
#include <net/udp.h>
@ -127,10 +128,42 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
out:
return segs;
}
static struct sk_buff **udp6_gro_receive(struct sk_buff **head,
struct sk_buff *skb)
{
struct udphdr *uh = udp_gro_udphdr(skb);
/* Don't bother verifying checksum if we're going to flush anyway. */
if (unlikely(!uh) ||
(!NAPI_GRO_CB(skb)->flush &&
skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
ip6_gro_compute_pseudo))) {
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
}
return udp_gro_receive(head, skb, uh);
}
int udp6_gro_complete(struct sk_buff *skb, int nhoff)
{
const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
if (uh->check)
uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
&ipv6h->daddr, 0);
return udp_gro_complete(skb, nhoff);
}
static const struct net_offload udpv6_offload = {
.callbacks = {
.gso_send_check = udp6_ufo_send_check,
.gso_segment = udp6_ufo_fragment,
.gro_receive = udp6_gro_receive,
.gro_complete = udp6_gro_complete,
},
};