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3822cc986c
Add the iproute2 support for the ACT_CSUM action. Can be used as
following, certainly in conjunction with the ACT_PEDIT action (pedit):
# In order to DNAT (stateless) IPv4 packet from 192.168.1.100 to
# 0x12345678 (18.52.86.120), and update the IPv4 header checksum and
# the UDP checksum (the last one, only if the packet is UDP).
tc filter add eth0 prio 1 protocol ip parent ffff: \
u32 match ip src 192.168.1.100/32 flowid :1 \
action pedit munge offset 16 u32 set 0x12345678 \
pipe csum ip and udp
# In order to alter destination address of IPv6 TCP packets from fc00::1
# and correct the TCP checksum (nothing happened? except maybe for
# checksums in the TCP payload ...).
tc filter add eth0 prio 1 protocol ipv6 parent ffff: \
u32 match ip6 src fc00::1/128 match ip6 protocol 0x06 0xff flowid :1 \
action pedit munge offset 24 u32 set 0x12345678 \
pipe csum tcp
33 lines
554 B
C
33 lines
554 B
C
#ifndef __LINUX_TC_CSUM_H
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#define __LINUX_TC_CSUM_H
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#include <linux/types.h>
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#include <linux/pkt_cls.h>
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#define TCA_ACT_CSUM 16
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enum {
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TCA_CSUM_UNSPEC,
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TCA_CSUM_PARMS,
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TCA_CSUM_TM,
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__TCA_CSUM_MAX
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};
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#define TCA_CSUM_MAX (__TCA_CSUM_MAX - 1)
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enum {
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TCA_CSUM_UPDATE_FLAG_IPV4HDR = 1,
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TCA_CSUM_UPDATE_FLAG_ICMP = 2,
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TCA_CSUM_UPDATE_FLAG_IGMP = 4,
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TCA_CSUM_UPDATE_FLAG_TCP = 8,
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TCA_CSUM_UPDATE_FLAG_UDP = 16,
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TCA_CSUM_UPDATE_FLAG_UDPLITE = 32
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};
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struct tc_csum {
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tc_gen;
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__u32 update_flags;
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};
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#endif /* __LINUX_TC_CSUM_H */
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