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linux/net/ipv6
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Herbert Xu 663ead3bb8 [NET]: Use csum_start offset instead of skb_transport_header 
The skb transport pointer is currently used to specify the start
of the checksum region for transmit checksum offload.  Unfortunately,
the same pointer is also used during receive side processing.

This creates a problem when we want to retransmit a received
packet with partial checksums since the skb transport pointer
would be overwritten.

This patch solves this problem by creating a new 16-bit csum_start
offset value to replace the skb transport header for the purpose
of checksums.  This offset is calculated from skb->head so that
it does not have to change when skb->data changes.

No extra space is required since csum_offset itself fits within
a 16-bit word so we can use the other 16 bits for csum_start.

For backwards compatibility, just before we push a packet with
partial checksums off into the device driver, we set the skb
transport header to what it would have been under the old scheme.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25 22:28:40 -07:00
..
netfilter [SK_BUFF]: Introduce skb_copy_to_linear_data{_offset} 2007-04-25 22:28:29 -07:00
addrconf.c [IPv6]: Use rtnl registration interface 2007-04-25 22:27:13 -07:00
addrconf_core.c [IPV6]: Fix __ipv6_addr_type() export in correct place. 2007-02-26 11:42:57 -08:00
af_inet6.c [INET]: Use jhash + random secret for ehash. 2007-04-25 22:28:06 -07:00
ah6.c [SK_BUFF]: unions of just one member don't get anything done, kill them 2007-04-25 22:26:20 -07:00
anycast.c [IPV6]: /proc/net/anycast6 unbalanced inet6_dev refcnt 2007-02-28 09:42:10 -08:00
datagram.c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
esp6.c [XFRM]: Optimize MTU calculation 2007-04-25 22:28:38 -07:00
exthdrs.c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
exthdrs_core.c [NET] IPV6: Fix whitespace errors. 2007-02-10 23:19:42 -08:00
fib6_rules.c [IPV6] FIB6RULE: Find source address during looking up route. 2007-04-25 22:28:35 -07:00
icmp.c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
inet6_connection_sock.c [TCP]: Restore SKB socket owner setting in tcp_transmit_skb(). 2007-01-26 01:04:55 -08:00
inet6_hashtables.c [IPV6] HASHTABLES: Use appropriate seed for caluculating ehash index. 2007-02-12 20:26:39 -08:00
ip6_fib.c [IPv6]: Use rtnl registration interface 2007-04-25 22:27:13 -07:00
ip6_flowlabel.c [PATCH] mark struct file_operations const 7 2007-02-12 09:48:46 -08:00
ip6_input.c [SK_BUFF]: unions of just one member don't get anything done, kill them 2007-04-25 22:26:20 -07:00
ip6_output.c [SK_BUFF]: Introduce skb_copy_from_linear_data{_offset} 2007-04-25 22:28:23 -07:00
ip6_tunnel.c [SK_BUFF]: unions of just one member don't get anything done, kill them 2007-04-25 22:26:20 -07:00
ipcomp6.c [SK_BUFF]: Introduce skb_copy_to_linear_data{_offset} 2007-04-25 22:28:29 -07:00
ipv6_sockglue.c [SK_BUFF]: Introduce skb_reset_transport_header(skb) 2007-04-25 22:25:15 -07:00
Kconfig [IPV6] ADDRCONF: Optimistic Duplicate Address Detection (RFC 4429) Support. 2007-04-25 22:23:43 -07:00
Makefile [IPV6]: Decentralize EXPORT_SYMBOLs. 2007-04-25 22:23:36 -07:00
mcast.c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
mip6.c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
ndisc.c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
netfilter.c [SK_BUFF]: Introduce ipv6_hdr(), remove skb->nh.ipv6h 2007-04-25 22:25:14 -07:00
proc.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
protocol.c [IPV6]: Decentralize EXPORT_SYMBOLs. 2007-04-25 22:23:36 -07:00
raw.c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
reassembly.c [SK_BUFF]: unions of just one member don't get anything done, kill them 2007-04-25 22:26:20 -07:00
route.c [IPv6]: Use rtnl registration interface 2007-04-25 22:27:13 -07:00
sit.c [SK_BUFF]: unions of just one member don't get anything done, kill them 2007-04-25 22:26:20 -07:00
sysctl_net_ipv6.c [PATCH] sysctl: remove insert_at_head from register_sysctl 2007-02-14 08:09:59 -08:00
tcp_ipv6.c [NET]: Use csum_start offset instead of skb_transport_header 2007-04-25 22:28:40 -07:00
tunnel6.c [IPSEC]: changing API of xfrm6_tunnel_register 2007-02-13 12:55:55 -08:00
udp.c [SK_BUFF]: Introduce udp_hdr(), remove skb->h.uh 2007-04-25 22:25:22 -07:00
udp_impl.h [NET] IPV6: Fix whitespace errors. 2007-02-10 23:19:42 -08:00
udplite.c [UDP]: Clean up UDP-Lite receive checksum 2007-04-25 22:23:51 -07:00
xfrm6_input.c [SK_BUFF]: Introduce ipv6_hdr(), remove skb->nh.ipv6h 2007-04-25 22:25:14 -07:00
xfrm6_mode_beet.c [SK_BUFF]: unions of just one member don't get anything done, kill them 2007-04-25 22:26:20 -07:00
xfrm6_mode_ro.c [SK_BUFF]: Some more layer header conversions 2007-04-25 22:26:03 -07:00
xfrm6_mode_transport.c [SK_BUFF]: unions of just one member don't get anything done, kill them 2007-04-25 22:26:20 -07:00
xfrm6_mode_tunnel.c [SK_BUFF]: unions of just one member don't get anything done, kill them 2007-04-25 22:26:20 -07:00
xfrm6_output.c [SK_BUFF]: Introduce skb_reset_network_header(skb) 2007-04-25 22:24:46 -07:00
xfrm6_policy.c [SK_BUFF]: Introduce skb_network_header_len 2007-04-25 22:26:19 -07:00
xfrm6_state.c [NET] IPV6: Fix whitespace errors. 2007-02-10 23:19:42 -08:00
xfrm6_tunnel.c [SK_BUFF]: Introduce ipv6_hdr(), remove skb->nh.ipv6h 2007-04-25 22:25:14 -07:00