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[NET]: Make mangling a checksum (0 -> 0xffff on the wire) explicit.

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Al Viro 2006-11-16 02:36:50 -08:00 committed by David S. Miller
parent b51655b958
commit f6ab028804
7 changed files with 11 additions and 10 deletions
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1
include/net/checksum.h
View File

@ -92,4 +92,5 @@ static inline __wsum csum_unfold(__sum16 n)
return (__force __wsum)n;
}
#define CSUM_MANGLED_0 ((__force __sum16)0xffff)
#endif

6
net/ipv4/ipvs/ip_vs_proto_udp.c
View File

@ -125,7 +125,7 @@ udp_fast_csum_update(struct udphdr *uhdr, __be32 oldip, __be32 newip,
ip_vs_check_diff(oldport ^ htons(0xFFFF),
newport, uhdr->check));
if (!uhdr->check)
uhdr->check = -1;
uhdr->check = CSUM_MANGLED_0;
}
static int
@ -173,7 +173,7 @@ udp_snat_handler(struct sk_buff **pskb,
cp->protocol,
(*pskb)->csum);
if (udph->check == 0)
udph->check = -1;
udph->check = CSUM_MANGLED_0;
IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n",
pp->name, udph->check,
(char*)&(udph->check) - (char*)udph);
@ -228,7 +228,7 @@ udp_dnat_handler(struct sk_buff **pskb,
cp->protocol,
(*pskb)->csum);
if (udph->check == 0)
udph->check = -1;
udph->check = CSUM_MANGLED_0;
(*pskb)->ip_summed = CHECKSUM_UNNECESSARY;
}
return 1;

2
net/ipv4/netfilter/ip_nat_helper.c
View File

@ -264,7 +264,7 @@ ip_nat_mangle_udp_packet(struct sk_buff **pskb,
csum_partial((char *)udph,
datalen, 0));
if (!udph->check)
udph->check = -1;
udph->check = CSUM_MANGLED_0;
} else
udph->check = nf_proto_csum_update(*pskb,
htons(oldlen) ^ htons(0xFFFF),

2
net/ipv4/netfilter/ip_nat_proto_udp.c
View File

@ -121,7 +121,7 @@ udp_manip_pkt(struct sk_buff **pskb,
*portptr ^ htons(0xFFFF), newport,
hdr->check, 0);
if (!hdr->check)
hdr->check = -1;
hdr->check = CSUM_MANGLED_0;
}
*portptr = newport;
return 1;

4
net/ipv4/udp.c
View File

@ -441,7 +441,7 @@ static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
if (uh->check == 0)
uh->check = -1;
uh->check = CSUM_MANGLED_0;
}
}
@ -490,7 +490,7 @@ int udp_push_pending_frames(struct sock *sk, struct udp_sock *up)
uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
sk->sk_protocol, csum );
if (uh->check == 0)
uh->check = -1;
uh->check = CSUM_MANGLED_0;
send:
err = ip_push_pending_frames(sk);

4
net/ipv6/raw.c
View File

@ -536,8 +536,8 @@ static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
&fl->fl6_dst,
total_len, fl->proto, tmp_csum);
if (tmp_csum == 0 && fl->proto == IPPROTO_UDP)
tmp_csum = -1;
if (csum == 0 && fl->proto == IPPROTO_UDP)
csum = CSUM_MANGLED_0;
if (skb_store_bits(skb, offset, &csum, 2))
BUG();

2
net/ipv6/udp.c
View File

@ -536,7 +536,7 @@ static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
up->len, fl->proto, csum );
if (uh->check == 0)
uh->check = -1;
uh->check = CSUM_MANGLED_0;
err = ip6_push_pending_frames(sk);
out: