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Viewing changes to datapath/linux/compat/udp.c

  • Committer: Package Import Robot
  • Author(s): James Page
  • Date: 2015-08-10 11:35:15 UTC
  • mfrom: (1.1.30)
  • Revision ID: package-import@ubuntu.com-20150810113515-575vj06oq29emxsn
Tags: 2.4.0~git20150810.97bab95-0ubuntu1
* New upstream snapshot from 2.4 branch:
  - d/*: Align any relevant packaging changes with upstream.
* d/*: wrap-and-sort.
* d/openvswitch-{common,vswitch}.install: Correct install location for
  bash completion files.
* d/tests/openflow.py: Explicitly use ovs-testcontroller as provided
  by 2.4.0 release.

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datapath/linux/compat/udp.c
 
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#include <linux/version.h>
 
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#ifndef HAVE_UDP_SET_CSUM
 
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#include <net/udp.h>
 
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/* Function to set UDP checksum for an IPv4 UDP packet. This is intended
 
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 * for the simple case like when setting the checksum for a UDP tunnel.
 
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 */
 
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void rpl_udp_set_csum(bool nocheck, struct sk_buff *skb,
 
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                      __be32 saddr, __be32 daddr, int len)
 
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{
 
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        struct udphdr *uh = udp_hdr(skb);
 
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        if (nocheck)
 
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                uh->check = 0;
 
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        else if (skb_is_gso(skb))
 
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                uh->check = ~udp_v4_check(len, saddr, daddr, 0);
 
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        else if (skb_dst(skb) && skb_dst(skb)->dev &&
 
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                 (skb_dst(skb)->dev->features & NETIF_F_V4_CSUM)) {
 
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                BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
 
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                skb->ip_summed = CHECKSUM_PARTIAL;
 
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                skb->csum_start = skb_transport_header(skb) - skb->head;
 
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                skb->csum_offset = offsetof(struct udphdr, check);
 
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                uh->check = ~udp_v4_check(len, saddr, daddr, 0);
 
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        } else {
 
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                __wsum csum;
 
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                BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
 
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                uh->check = 0;
 
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                csum = skb_checksum(skb, 0, len, 0);
 
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                uh->check = udp_v4_check(len, saddr, daddr, csum);
 
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                if (uh->check == 0)
 
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                        uh->check = CSUM_MANGLED_0;
 
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                skb->ip_summed = CHECKSUM_UNNECESSARY;
 
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        }
 
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}
 
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EXPORT_SYMBOL_GPL(rpl_udp_set_csum);
 
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#endif /* Linux version < 3.16 */