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[NET]: Detect hardware rx checksum faults correctly 

Here is the patch that introduces the generic skb_checksum_complete
which also checks for hardware RX checksum faults.  If that happens,
it'll call netdev_rx_csum_fault which currently prints out a stack
trace with the device name.  In future it can turn off RX checksum.

I've converted every spot under net/ that does RX checksum checks to
use skb_checksum_complete or __skb_checksum_complete with the
exceptions of:

* Those places where checksums are done bit by bit.  These will call
netdev_rx_csum_fault directly.

* The following have not been completely checked/converted:

ipmr
ip_vs
netfilter
dccp

This patch is based on patches and suggestions from Stephen Hemminger
and David S. Miller.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2005-11-10 13:01:24 -08:00 committed by David S. Miller
parent 1064e944d0
commit fb286bb299
19 changed files with 173 additions and 134 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/netdevice.h
View File

@ -927,6 +927,13 @@ extern int netdev_max_backlog;
extern int weight_p;
extern int netdev_set_master(struct net_device *dev, struct net_device *master);
extern int skb_checksum_help(struct sk_buff *skb, int inward);
#ifdef CONFIG_BUG
extern void netdev_rx_csum_fault(struct net_device *dev);
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
/* rx skb timestamps */
extern void net_enable_timestamp(void);
extern void net_disable_timestamp(void);

27
include/linux/skbuff.h
View File

@ -1236,8 +1236,7 @@ extern unsigned int datagram_poll(struct file *file, struct socket *sock,
extern int skb_copy_datagram_iovec(const struct sk_buff *from,
int offset, struct iovec *to,
int size);
extern int skb_copy_and_csum_datagram_iovec(const
struct sk_buff *skb,
extern int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb,
int hlen,
struct iovec *iov);
extern void skb_free_datagram(struct sock *sk, struct sk_buff *skb);
@ -1305,6 +1304,30 @@ static inline void skb_set_timestamp(struct sk_buff *skb, const struct timeval *
extern void __net_timestamp(struct sk_buff *skb);
extern unsigned int __skb_checksum_complete(struct sk_buff *skb);
/**
* skb_checksum_complete - Calculate checksum of an entire packet
* @skb: packet to process
*
* This function calculates the checksum over the entire packet plus
* the value of skb->csum. The latter can be used to supply the
* checksum of a pseudo header as used by TCP/UDP. It returns the
* checksum.
*
* For protocols that contain complete checksums such as ICMP/TCP/UDP,
* this function can be used to verify that checksum on received
* packets. In that case the function should return zero if the
* checksum is correct. In particular, this function will return zero
* if skb->ip_summed is CHECKSUM_UNNECESSARY which indicates that the
* hardware has already verified the correctness of the checksum.
*/
static inline unsigned int skb_checksum_complete(struct sk_buff *skb)
{
return skb->ip_summed != CHECKSUM_UNNECESSARY &&
__skb_checksum_complete(skb);
}
#ifdef CONFIG_NETFILTER
static inline void nf_conntrack_put(struct nf_conntrack *nfct)
{

3
include/net/tcp.h
View File

@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/cache.h>
#include <linux/percpu.h>
#include <linux/skbuff.h>
#include <net/inet_connection_sock.h>
#include <net/inet_timewait_sock.h>
@ -852,7 +853,7 @@ static __inline__ u16 tcp_v4_check(struct tcphdr *th, int len,
static __inline__ int __tcp_checksum_complete(struct sk_buff *skb)
{
return (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum));
return __skb_checksum_complete(skb);
}
static __inline__ int tcp_checksum_complete(struct sk_buff *skb)

21
net/core/datagram.c
View File

@ -350,6 +350,20 @@ fault:
return -EFAULT;
}
unsigned int __skb_checksum_complete(struct sk_buff *skb)
{
unsigned int sum;
sum = (u16)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum));
if (likely(!sum)) {
if (unlikely(skb->ip_summed == CHECKSUM_HW))
netdev_rx_csum_fault(skb->dev);
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
return sum;
}
EXPORT_SYMBOL(__skb_checksum_complete);
/**
* skb_copy_and_csum_datagram_iovec - Copy and checkum skb to user iovec.
* @skb: skbuff
@ -363,7 +377,7 @@ fault:
* -EFAULT - fault during copy. Beware, in this case iovec
* can be modified!
*/
int skb_copy_and_csum_datagram_iovec(const struct sk_buff *skb,
int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb,
int hlen, struct iovec *iov)
{
unsigned int csum;
@ -376,8 +390,7 @@ int skb_copy_and_csum_datagram_iovec(const struct sk_buff *skb,
iov++;
if (iov->iov_len < chunk) {
if ((unsigned short)csum_fold(skb_checksum(skb, 0, chunk + hlen,
skb->csum)))
if (__skb_checksum_complete(skb))
goto csum_error;
if (skb_copy_datagram_iovec(skb, hlen, iov, chunk))
goto fault;
@ -388,6 +401,8 @@ int skb_copy_and_csum_datagram_iovec(const struct sk_buff *skb,
goto fault;
if ((unsigned short)csum_fold(csum))
goto csum_error;
if (unlikely(skb->ip_summed == CHECKSUM_HW))
netdev_rx_csum_fault(skb->dev);
iov->iov_len -= chunk;
iov->iov_base += chunk;
}

12
net/core/dev.c
View File

@ -1108,6 +1108,18 @@ out:
return ret;
}
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
if (net_ratelimit()) {
printk(KERN_ERR "%s: hw csum failure.\n", dev->name);
dump_stack();
}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif
#ifdef CONFIG_HIGHMEM
/* Actually, we should eliminate this check as soon as we know, that:
* 1. IOMMU is present and allows to map all the memory.

18
net/core/netpoll.c
View File

@ -101,16 +101,20 @@ void netpoll_queue(struct sk_buff *skb)
static int checksum_udp(struct sk_buff *skb, struct udphdr *uh,
unsigned short ulen, u32 saddr, u32 daddr)
{
if (uh->check == 0)
unsigned int psum;
if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY)
return 0;
if (skb->ip_summed == CHECKSUM_HW)
return csum_tcpudp_magic(
saddr, daddr, ulen, IPPROTO_UDP, skb->csum);
psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
skb->csum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
if (skb->ip_summed == CHECKSUM_HW &&
!(u16)csum_fold(csum_add(psum, skb->csum)))
return 0;
return csum_fold(skb_checksum(skb, 0, skb->len, skb->csum));
skb->csum = psum;
return __skb_checksum_complete(skb);
}
/*
@ -489,7 +493,7 @@ int __netpoll_rx(struct sk_buff *skb)
if (ulen != len)
goto out;
if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr) < 0)
if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
goto out;
if (np->local_ip && np->local_ip != ntohl(iph->daddr))
goto out;

6
net/ipv4/icmp.c
View File

@ -934,11 +934,11 @@ int icmp_rcv(struct sk_buff *skb)
case CHECKSUM_HW:
if (!(u16)csum_fold(skb->csum))
break;
LIMIT_NETDEBUG(KERN_DEBUG "icmp v4 hw csum failure\n");
/* fall through */
case CHECKSUM_NONE:
if ((u16)csum_fold(skb_checksum(skb, 0, skb->len, 0)))
skb->csum = 0;
if (__skb_checksum_complete(skb))
goto error;
default:;
}
if (!pskb_pull(skb, sizeof(struct icmphdr)))

19
net/ipv4/igmp.c
View File

@ -872,11 +872,18 @@ int igmp_rcv(struct sk_buff *skb)
return 0;
}
if (!pskb_may_pull(skb, sizeof(struct igmphdr)) ||
(u16)csum_fold(skb_checksum(skb, 0, len, 0))) {
in_dev_put(in_dev);
kfree_skb(skb);
return 0;
if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
goto drop;
switch (skb->ip_summed) {
case CHECKSUM_HW:
if (!(u16)csum_fold(skb->csum))
break;
/* fall through */
case CHECKSUM_NONE:
skb->csum = 0;
if (__skb_checksum_complete(skb))
goto drop;
}
ih = skb->h.igmph;
@ -906,6 +913,8 @@ int igmp_rcv(struct sk_buff *skb)
default:
NETDEBUG(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type);
}
drop:
in_dev_put(in_dev);
kfree_skb(skb);
return 0;

15
net/ipv4/ip_gre.c
View File

@ -577,15 +577,16 @@ static int ipgre_rcv(struct sk_buff *skb)
goto drop_nolock;
if (flags&GRE_CSUM) {
if (skb->ip_summed == CHECKSUM_HW) {
switch (skb->ip_summed) {
case CHECKSUM_HW:
csum = (u16)csum_fold(skb->csum);
if (csum)
skb->ip_summed = CHECKSUM_NONE;
}
if (skb->ip_summed == CHECKSUM_NONE) {
skb->csum = skb_checksum(skb, 0, skb->len, 0);
if (!csum)
break;
/* fall through */
case CHECKSUM_NONE:
skb->csum = 0;
csum = __skb_checksum_complete(skb);
skb->ip_summed = CHECKSUM_HW;
csum = (u16)csum_fold(skb->csum);
}
offset += 4;
}

11
net/ipv4/netfilter/ip_conntrack_proto_icmp.c
View File

@ -13,6 +13,7 @@
#include <linux/in.h>
#include <linux/icmp.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <net/ip.h>
#include <net/checksum.h>
#include <linux/netfilter.h>
@ -230,19 +231,15 @@ icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
case CHECKSUM_HW:
if (!(u16)csum_fold(skb->csum))
break;
if (LOG_INVALID(IPPROTO_ICMP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_icmp: bad HW ICMP checksum ");
return -NF_ACCEPT;
/* fall through */
case CHECKSUM_NONE:
if ((u16)csum_fold(skb_checksum(skb, 0, skb->len, 0))) {
skb->csum = 0;
if (__skb_checksum_complete(skb)) {
if (LOG_INVALID(IPPROTO_ICMP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_icmp: bad ICMP checksum ");
return -NF_ACCEPT;
}
default:
break;
}
checksum_skipped:

24
net/ipv4/tcp_ipv4.c
View File

@ -1110,24 +1110,18 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
static int tcp_v4_checksum_init(struct sk_buff *skb)
{
if (skb->ip_summed == CHECKSUM_HW) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (!tcp_v4_check(skb->h.th, skb->len, skb->nh.iph->saddr,
skb->nh.iph->daddr, skb->csum))
skb->nh.iph->daddr, skb->csum)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
return 0;
LIMIT_NETDEBUG(KERN_DEBUG "hw tcp v4 csum failed\n");
skb->ip_summed = CHECKSUM_NONE;
}
}
skb->csum = csum_tcpudp_nofold(skb->nh.iph->saddr, skb->nh.iph->daddr,
skb->len, IPPROTO_TCP, 0);
if (skb->len <= 76) {
if (tcp_v4_check(skb->h.th, skb->len, skb->nh.iph->saddr,
skb->nh.iph->daddr,
skb_checksum(skb, 0, skb->len, 0)))
return -1;
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else {
skb->csum = ~tcp_v4_check(skb->h.th, skb->len,
skb->nh.iph->saddr,
skb->nh.iph->daddr, 0);
return __skb_checksum_complete(skb);
}
return 0;
}
@ -1219,7 +1213,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
* provided case of th->doff==0 is elimineted.
* So, we defer the checks. */
if ((skb->ip_summed != CHECKSUM_UNNECESSARY &&
tcp_v4_checksum_init(skb) < 0))
tcp_v4_checksum_init(skb)))
goto bad_packet;
th = skb->h.th;

7
net/ipv4/udp.c
View File

@ -761,7 +761,7 @@ int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
static __inline__ int __udp_checksum_complete(struct sk_buff *skb)
{
return (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum));
return __skb_checksum_complete(skb);
}
static __inline__ int udp_checksum_complete(struct sk_buff *skb)
@ -1100,11 +1100,8 @@ static int udp_checksum_init(struct sk_buff *skb, struct udphdr *uh,
if (uh->check == 0) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else if (skb->ip_summed == CHECKSUM_HW) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (!udp_check(uh, ulen, saddr, daddr, skb->csum))
return 0;
LIMIT_NETDEBUG(KERN_DEBUG "udp v4 hw csum failure.\n");
skb->ip_summed = CHECKSUM_NONE;
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
if (skb->ip_summed != CHECKSUM_UNNECESSARY)
skb->csum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);

21
net/ipv6/icmp.c
View File

@ -585,17 +585,16 @@ static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
daddr = &skb->nh.ipv6h->daddr;
/* Perform checksum. */
if (skb->ip_summed == CHECKSUM_HW) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
skb->csum)) {
LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 hw checksum failed\n");
skb->ip_summed = CHECKSUM_NONE;
}
}
if (skb->ip_summed == CHECKSUM_NONE) {
if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
skb_checksum(skb, 0, skb->len, 0))) {
switch (skb->ip_summed) {
case CHECKSUM_HW:
if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
skb->csum))
break;
/* fall through */
case CHECKSUM_NONE:
skb->csum = ~csum_ipv6_magic(saddr, daddr, skb->len,
IPPROTO_ICMPV6, 0);
if (__skb_checksum_complete(skb)) {
LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n",
NIP6(*saddr), NIP6(*daddr));
goto discard_it;

42
net/ipv6/raw.c
View File

@ -298,13 +298,10 @@ void rawv6_err(struct sock *sk, struct sk_buff *skb,
static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
{
if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
skb->ip_summed != CHECKSUM_UNNECESSARY) {
if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
/* FIXME: increment a raw6 drops counter here */
kfree_skb(skb);
return 0;
}
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb_checksum_complete(skb)) {
/* FIXME: increment a raw6 drops counter here */
kfree_skb(skb);
return 0;
}
/* Charge it to the socket. */
@ -337,32 +334,25 @@ int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
if (!rp->checksum)
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
if (skb->ip_summed == CHECKSUM_HW) {
skb_postpull_rcsum(skb, skb->nh.raw,
skb->h.raw - skb->nh.raw);
if (skb->ip_summed == CHECKSUM_HW) {
skb_postpull_rcsum(skb, skb->nh.raw,
skb->h.raw - skb->nh.raw);
if (!csum_ipv6_magic(&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr,
skb->len, inet->num, skb->csum))
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (csum_ipv6_magic(&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr,
skb->len, inet->num, skb->csum)) {
LIMIT_NETDEBUG(KERN_DEBUG "raw v6 hw csum failure.\n");
skb->ip_summed = CHECKSUM_NONE;
}
}
if (skb->ip_summed == CHECKSUM_NONE)
skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr,
skb->len, inet->num, 0);
}
if (skb->ip_summed != CHECKSUM_UNNECESSARY)
skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr,
skb->len, inet->num, 0);
if (inet->hdrincl) {
if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
(unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
if (skb_checksum_complete(skb)) {
/* FIXME: increment a raw6 drops counter here */
kfree_skb(skb);
return 0;
}
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
rawv6_rcv_skb(sk, skb);
@ -407,7 +397,7 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
} else if (msg->msg_flags&MSG_TRUNC) {
if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
if (__skb_checksum_complete(skb))
goto csum_copy_err;
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
} else {

20
net/ipv6/tcp_ipv6.c
View File

@ -1401,20 +1401,18 @@ out:
static int tcp_v6_checksum_init(struct sk_buff *skb)
{
if (skb->ip_summed == CHECKSUM_HW) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr,skb->csum))
&skb->nh.ipv6h->daddr,skb->csum)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
return 0;
LIMIT_NETDEBUG(KERN_DEBUG "hw tcp v6 csum failed\n");
}
}
skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr, 0);
if (skb->len <= 76) {
if (tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr,skb_checksum(skb, 0, skb->len, 0)))
return -1;
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else {
skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr,0);
return __skb_checksum_complete(skb);
}
return 0;
}
@ -1575,7 +1573,7 @@ static int tcp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
goto discard_it;
if ((skb->ip_summed != CHECKSUM_UNNECESSARY &&
tcp_v6_checksum_init(skb) < 0))
tcp_v6_checksum_init(skb)))
goto bad_packet;
th = skb->h.th;

25
net/ipv6/udp.c
View File

@ -248,7 +248,7 @@ try_again:
err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
copied);
} else if (msg->msg_flags&MSG_TRUNC) {
if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
if (__skb_checksum_complete(skb))
goto csum_copy_err;
err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
copied);
@ -363,13 +363,10 @@ static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
return -1;
}
if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
kfree_skb(skb);
return 0;
}
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (skb_checksum_complete(skb)) {
UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
kfree_skb(skb);
return 0;
}
if (sock_queue_rcv_skb(sk,skb)<0) {
@ -491,13 +488,10 @@ static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
uh = skb->h.uh;
}
if (skb->ip_summed==CHECKSUM_HW) {
if (skb->ip_summed == CHECKSUM_HW &&
!csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
LIMIT_NETDEBUG(KERN_DEBUG "udp v6 hw csum failure.\n");
skb->ip_summed = CHECKSUM_NONE;
}
}
if (skb->ip_summed != CHECKSUM_UNNECESSARY)
skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
@ -521,8 +515,7 @@ static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
goto discard;
if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
(unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
if (skb_checksum_complete(skb))
goto discard;
UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);

15
net/rxrpc/transport.c
View File

@ -23,6 +23,7 @@
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/icmp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/ip.h>
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
@ -475,15 +476,11 @@ void rxrpc_trans_receive_packet(struct rxrpc_transport *trans)
/* we'll probably need to checksum it (didn't call
* sock_recvmsg) */
if (pkt->ip_summed != CHECKSUM_UNNECESSARY) {
if ((unsigned short)
csum_fold(skb_checksum(pkt, 0, pkt->len,
pkt->csum))) {
kfree_skb(pkt);
rxrpc_krxiod_queue_transport(trans);
_leave(" CSUM failed");
return;
}
if (skb_checksum_complete(pkt)) {
kfree_skb(pkt);
rxrpc_krxiod_queue_transport(trans);
_leave(" CSUM failed");
return;
}
addr = pkt->nh.iph->saddr;

5
net/sunrpc/socklib.c
View File

@ -6,6 +6,9 @@
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/compiler.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/pagemap.h>
#include <linux/udp.h>
@ -165,6 +168,8 @@ int csum_partial_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
return -1;
if ((unsigned short)csum_fold(desc.csum))
return -1;
if (unlikely(skb->ip_summed == CHECKSUM_HW))
netdev_rx_csum_fault(skb->dev);
return 0;
no_checksum:
if (xdr_partial_copy_from_skb(xdr, 0, &desc, skb_read_bits) < 0)

9
net/sunrpc/svcsock.c
View File

@ -623,12 +623,9 @@ svc_udp_recvfrom(struct svc_rqst *rqstp)
/* we can use it in-place */
rqstp->rq_arg.head[0].iov_base = skb->data + sizeof(struct udphdr);
rqstp->rq_arg.head[0].iov_len = len;
if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
skb_free_datagram(svsk->sk_sk, skb);
return 0;
}
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (skb_checksum_complete(skb)) {
skb_free_datagram(svsk->sk_sk, skb);
return 0;
}
rqstp->rq_skbuff = skb;
}