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openvswitch: Fix checksum update for actions on UDP packets.

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When modifying IP addresses or ports on a UDP packet we don't
correctly follow the rules for unchecksummed packets.  This meant
that packets without a checksum can be given a incorrect new checksum
and packets with a checksum can become marked as being unchecksummed.
This fixes it to handle those requirements.

Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Jesse Gross 2012-03-06 15:05:46 -08:00
parent 651a68ea2c
commit 81e5d41d7e
1 changed files with 32 additions and 12 deletions
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44
net/openvswitch/actions.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2007-2011 Nicira Networks.
* Copyright (c) 2007-2012 Nicira Networks.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
@ -145,9 +145,16 @@ static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
*addr, new_addr, 1);
} else if (nh->protocol == IPPROTO_UDP) {
if (likely(transport_len >= sizeof(struct udphdr)))
inet_proto_csum_replace4(&udp_hdr(skb)->check, skb,
*addr, new_addr, 1);
if (likely(transport_len >= sizeof(struct udphdr))) {
struct udphdr *uh = udp_hdr(skb);
if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
inet_proto_csum_replace4(&uh->check, skb,
*addr, new_addr, 1);
if (!uh->check)
uh->check = CSUM_MANGLED_0;
}
}
}
csum_replace4(&nh->check, *addr, new_addr);
@ -197,8 +204,22 @@ static void set_tp_port(struct sk_buff *skb, __be16 *port,
skb->rxhash = 0;
}
static int set_udp_port(struct sk_buff *skb,
const struct ovs_key_udp *udp_port_key)
static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port)
{
struct udphdr *uh = udp_hdr(skb);
if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
set_tp_port(skb, port, new_port, &uh->check);
if (!uh->check)
uh->check = CSUM_MANGLED_0;
} else {
*port = new_port;
skb->rxhash = 0;
}
}
static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key)
{
struct udphdr *uh;
int err;
@ -210,16 +231,15 @@ static int set_udp_port(struct sk_buff *skb,
uh = udp_hdr(skb);
if (udp_port_key->udp_src != uh->source)
set_tp_port(skb, &uh->source, udp_port_key->udp_src, &uh->check);
set_udp_port(skb, &uh->source, udp_port_key->udp_src);
if (udp_port_key->udp_dst != uh->dest)
set_tp_port(skb, &uh->dest, udp_port_key->udp_dst, &uh->check);
set_udp_port(skb, &uh->dest, udp_port_key->udp_dst);
return 0;
}
static int set_tcp_port(struct sk_buff *skb,
const struct ovs_key_tcp *tcp_port_key)
static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key)
{
struct tcphdr *th;
int err;
@ -328,11 +348,11 @@ static int execute_set_action(struct sk_buff *skb,
break;
case OVS_KEY_ATTR_TCP:
err = set_tcp_port(skb, nla_data(nested_attr));
err = set_tcp(skb, nla_data(nested_attr));
break;
case OVS_KEY_ATTR_UDP:
err = set_udp_port(skb, nla_data(nested_attr));
err = set_udp(skb, nla_data(nested_attr));
break;
}