mirror of
https://github.com/openvswitch/ovs
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beabb77598
Upstream commit:
udp: Generic functions to set checksum
Added udp_set_csum and udp6_set_csum functions to set UDP checksums
in packets. These are for simple UDP packets such as those that might
be created in UDP tunnels.
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Upstream: af5fcba7 ("udp: Generic functions to set checksum")
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Thomas Graf <tgraf@noironetworks.com>
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
#ifndef __NET_UDP_WRAPPER_H
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#define __NET_UDP_WRAPPER_H 1
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#include <linux/version.h>
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#include_next <net/udp.h>
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#ifndef HAVE_UDP_FLOW_SRC_PORT
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static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb,
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int min, int max, bool use_eth)
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{
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u32 hash;
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if (min >= max) {
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/* Use default range */
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inet_get_local_port_range(net, &min, &max);
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}
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hash = skb_get_hash(skb);
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if (unlikely(!hash) && use_eth) {
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/* Can't find a normal hash, caller has indicated an Ethernet
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* packet so use that to compute a hash.
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*/
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hash = jhash(skb->data, 2 * ETH_ALEN,
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(__force u32) skb->protocol);
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}
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/* Since this is being sent on the wire obfuscate hash a bit
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* to minimize possbility that any useful information to an
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* attacker is leaked. Only upper 16 bits are relevant in the
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* computation for 16 bit port value.
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*/
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hash ^= hash << 16;
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return htons((((u64) hash * (max - min)) >> 32) + min);
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}
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#endif
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0)
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static inline __sum16 udp_v4_check(int len, __be32 saddr,
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__be32 daddr, __wsum base)
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{
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return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base);
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}
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void udp_set_csum(bool nocheck, struct sk_buff *skb,
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__be32 saddr, __be32 daddr, int len);
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#endif
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#endif
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