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conntrack: Add support for NAT.

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Extend OVS conntrack interface to cover NAT.  New nested NAT action
may be included with a CT action.  A bare NAT action only mangles
existing connections.  If a NAT action with src or dst range attribute
is included, new (non-committed) connections are mangled according to
the NAT attributes.

This work extends on a branch by Thomas Graf at
https://github.com/tgraf/ovs/tree/nat.

Signed-off-by: Jarno Rajahalme <jarno@ovn.org>
Acked-by: Ben Pfaff <blp@ovn.org>
This commit is contained in:
Jarno Rajahalme
2015-11-24 15:47:56 -08:00
parent 2fa3e06d35
commit 9ac0aadab9
12 changed files with 1579 additions and 39 deletions
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7
lib/packets.h
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@@ -725,10 +725,13 @@ BUILD_ASSERT_DECL(TCP_HEADER_LEN == sizeof(struct tcp_header));
#define CS_REPLY_DIR 0x08
#define CS_INVALID 0x10
#define CS_TRACKED 0x20
#define CS_SRC_NAT 0x40
#define CS_DST_NAT 0x80
/* Undefined connection state bits. */
#define CS_SUPPORTED_MASK (CS_NEW | CS_ESTABLISHED | CS_RELATED \
| CS_INVALID | CS_REPLY_DIR | CS_TRACKED)
| CS_INVALID | CS_REPLY_DIR | CS_TRACKED \
| CS_SRC_NAT | CS_DST_NAT)
#define CS_UNSUPPORTED_MASK (~(uint32_t)CS_SUPPORTED_MASK)
#define ARP_HRD_ETHERNET 1
@@ -951,6 +954,8 @@ struct vxlanhdr {
#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
void ipv6_format_addr(const struct in6_addr *addr, struct ds *);
void ipv6_format_addr_bracket(const struct in6_addr *addr, struct ds *,
bool bracket);
void ipv6_format_mapped(const struct in6_addr *addr, struct ds *);
void ipv6_format_masked(const struct in6_addr *addr,
const struct in6_addr *mask, struct ds *);