mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
15f35d49c9
Since UDP-Lite is always using checksum, the following path is
triggered when calculating pseudo header for it:
udp4_csum_init() or udp6_csum_init()
skb_checksum_init_zero_check()
__skb_checksum_validate_complete()
The problem can appear if skb->len is less than CHECKSUM_BREAK. In
this particular case __skb_checksum_validate_complete() also invokes
__skb_checksum_complete(skb). If UDP-Lite is using partial checksum
that covers only part of a packet, the function will return bad
checksum and the packet will be dropped.
It can be fixed if we skip skb_checksum_init_zero_check() and only
set the required pseudo header checksum for UDP-Lite with partial
checksum before udp4_csum_init()/udp6_csum_init() functions return.
Fixes: ed70fcfcee ("net: Call skb_checksum_init in IPv4")
Fixes: e4f45b7f40 ("net: Call skb_checksum_init in IPv6")
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <net/ip.h>
|
|
#include <net/udp.h>
|
|
#include <net/udplite.h>
|
|
#include <asm/checksum.h>
|
|
|
|
#ifndef _HAVE_ARCH_IPV6_CSUM
|
|
__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
|
|
const struct in6_addr *daddr,
|
|
__u32 len, __u8 proto, __wsum csum)
|
|
{
|
|
|
|
int carry;
|
|
__u32 ulen;
|
|
__u32 uproto;
|
|
__u32 sum = (__force u32)csum;
|
|
|
|
sum += (__force u32)saddr->s6_addr32[0];
|
|
carry = (sum < (__force u32)saddr->s6_addr32[0]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)saddr->s6_addr32[1];
|
|
carry = (sum < (__force u32)saddr->s6_addr32[1]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)saddr->s6_addr32[2];
|
|
carry = (sum < (__force u32)saddr->s6_addr32[2]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)saddr->s6_addr32[3];
|
|
carry = (sum < (__force u32)saddr->s6_addr32[3]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)daddr->s6_addr32[0];
|
|
carry = (sum < (__force u32)daddr->s6_addr32[0]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)daddr->s6_addr32[1];
|
|
carry = (sum < (__force u32)daddr->s6_addr32[1]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)daddr->s6_addr32[2];
|
|
carry = (sum < (__force u32)daddr->s6_addr32[2]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)daddr->s6_addr32[3];
|
|
carry = (sum < (__force u32)daddr->s6_addr32[3]);
|
|
sum += carry;
|
|
|
|
ulen = (__force u32)htonl((__u32) len);
|
|
sum += ulen;
|
|
carry = (sum < ulen);
|
|
sum += carry;
|
|
|
|
uproto = (__force u32)htonl(proto);
|
|
sum += uproto;
|
|
carry = (sum < uproto);
|
|
sum += carry;
|
|
|
|
return csum_fold((__force __wsum)sum);
|
|
}
|
|
EXPORT_SYMBOL(csum_ipv6_magic);
|
|
#endif
|
|
|
|
int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
|
|
{
|
|
int err;
|
|
|
|
UDP_SKB_CB(skb)->partial_cov = 0;
|
|
UDP_SKB_CB(skb)->cscov = skb->len;
|
|
|
|
if (proto == IPPROTO_UDPLITE) {
|
|
err = udplite_checksum_init(skb, uh);
|
|
if (err)
|
|
return err;
|
|
|
|
if (UDP_SKB_CB(skb)->partial_cov) {
|
|
skb->csum = ip6_compute_pseudo(skb, proto);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels)
|
|
* we accept a checksum of zero here. When we find the socket
|
|
* for the UDP packet we'll check if that socket allows zero checksum
|
|
* for IPv6 (set by socket option).
|
|
*
|
|
* Note, we are only interested in != 0 or == 0, thus the
|
|
* force to int.
|
|
*/
|
|
return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check,
|
|
ip6_compute_pseudo);
|
|
}
|
|
EXPORT_SYMBOL(udp6_csum_init);
|
|
|
|
/* Function to set UDP checksum for an IPv6 UDP packet. This is intended
|
|
* for the simple case like when setting the checksum for a UDP tunnel.
|
|
*/
|
|
void udp6_set_csum(bool nocheck, struct sk_buff *skb,
|
|
const struct in6_addr *saddr,
|
|
const struct in6_addr *daddr, int len)
|
|
{
|
|
struct udphdr *uh = udp_hdr(skb);
|
|
|
|
if (nocheck)
|
|
uh->check = 0;
|
|
else if (skb_is_gso(skb))
|
|
uh->check = ~udp_v6_check(len, saddr, daddr, 0);
|
|
else if (skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
uh->check = 0;
|
|
uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb));
|
|
if (uh->check == 0)
|
|
uh->check = CSUM_MANGLED_0;
|
|
} else {
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
skb->csum_start = skb_transport_header(skb) - skb->head;
|
|
skb->csum_offset = offsetof(struct udphdr, check);
|
|
uh->check = ~udp_v6_check(len, saddr, daddr, 0);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(udp6_set_csum);
|