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authorHerbert Xu <herbert@gondor.apana.org.au>2005-11-10 13:01:24 -0800
committerDavid S. Miller <davem@davemloft.net>2005-11-10 13:01:24 -0800
commitfb286bb2990a107009dbf25f6ffebeb7df77f9be (patch)
tree0eede2c37f1b3831e59601933eebf6b82be75ffc /net/ipv4
parent1064e944d03eb7a72c0fa11236d5e69cfd877a71 (diff)
[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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/icmp.c6
-rw-r--r--net/ipv4/igmp.c19
-rw-r--r--net/ipv4/ip_gre.c15
-rw-r--r--net/ipv4/netfilter/ip_conntrack_proto_icmp.c11
-rw-r--r--net/ipv4/tcp_ipv4.c24
-rw-r--r--net/ipv4/udp.c7
6 files changed, 40 insertions, 42 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 175e093ec56..e3eceecd049 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -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)))
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index c6247fc8406..c04607b4921 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -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;
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 896ce3f8f53..4e9c74b54b1 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -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;
}
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
index 5198f3a1e2c..e4d6b268e8c 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
@@ -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:
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 634dabb558f..ac1fcf5b4eb 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -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;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index e0bd1013cb0..2422a5f7195 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -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);