[ovs-dev] [ofp11_match v2 7/7] Allow general masking of IPv6 addresses rather than just CIDR masks.
Ben Pfaff
blp at nicira.com
Sat Jun 9 22:55:58 UTC 2012
OF1.2 and later make these fields fully maskable so we might as well also.
Signed-off-by: Ben Pfaff <blp at nicira.com>
---
NEWS | 4 ++--
include/openflow/nicira-ext.h | 6 ++++--
lib/meta-flow.c | 25 +++++++++++--------------
lib/meta-flow.h | 1 -
lib/packets.c | 7 ++++---
tests/ovs-ofctl.at | 18 ++++++++++++++++--
utilities/ovs-ofctl.8.in | 6 +++++-
7 files changed, 42 insertions(+), 25 deletions(-)
diff --git a/NEWS b/NEWS
index 24ba8fc..3d879c8 100644
--- a/NEWS
+++ b/NEWS
@@ -3,8 +3,8 @@ post-v1.7.0
- ovs-ofctl:
- "mod-port" command can now control all OpenFlow config flags.
- OpenFlow:
- - Allow general bitwise masking for IPv4 source and destination
- addresses in IPv4 and ARP packets. (Previously, only CIDR masks
+ - Allow general bitwise masking for IPv4 and IPv6 addresses in
+ IPv4, IPv6, and ARP packets. (Previously, only CIDR masks
were allowed.)
- Allow support for arbitrary Ethernet masks. (Previously, only
the multicast bit in the destination address could be individually
diff --git a/include/openflow/nicira-ext.h b/include/openflow/nicira-ext.h
index 9401376..2f46311 100644
--- a/include/openflow/nicira-ext.h
+++ b/include/openflow/nicira-ext.h
@@ -1608,7 +1608,8 @@ OFP_ASSERT(sizeof(struct nx_action_output_reg) == 24);
*
* Format: 128-bit IPv6 address.
*
- * Masking: Only CIDR masks are allowed, that is, masks that consist of N
+ * Masking: Fully maskable, in Open vSwitch 1.8 and later. In previous
+ * versions, only CIDR masks are allowed, that is, masks that consist of N
* high-order bits set to 1 and the other 128-N bits set to 0. */
#define NXM_NX_IPV6_SRC NXM_HEADER (0x0001, 19, 16)
#define NXM_NX_IPV6_SRC_W NXM_HEADER_W(0x0001, 19, 16)
@@ -1636,7 +1637,8 @@ OFP_ASSERT(sizeof(struct nx_action_output_reg) == 24);
*
* Format: 128-bit IPv6 address.
*
- * Masking: Only CIDR masks are allowed, that is, masks that consist of N
+ * Masking: Fully maskable, in Open vSwitch 1.8 and later. In previous
+ * versions, only CIDR masks are allowed, that is, masks that consist of N
* high-order bits set to 1 and the other 128-N bits set to 0. */
#define NXM_NX_ND_TARGET NXM_HEADER (0x0001, 23, 16)
#define NXM_NX_ND_TARGET_W NXM_HEADER_W (0x0001, 23, 16)
diff --git a/lib/meta-flow.c b/lib/meta-flow.c
index 98169d3..3186bd7 100644
--- a/lib/meta-flow.c
+++ b/lib/meta-flow.c
@@ -195,7 +195,7 @@ static const struct mf_field mf_fields[MFF_N_IDS] = {
{
MFF_IPV6_SRC, "ipv6_src", NULL,
MF_FIELD_SIZES(ipv6),
- MFM_CIDR, 0,
+ MFM_FULLY, 0,
MFS_IPV6,
MFP_IPV6,
true,
@@ -204,7 +204,7 @@ static const struct mf_field mf_fields[MFF_N_IDS] = {
}, {
MFF_IPV6_DST, "ipv6_dst", NULL,
MF_FIELD_SIZES(ipv6),
- MFM_CIDR, 0,
+ MFM_FULLY, 0,
MFS_IPV6,
MFP_IPV6,
true,
@@ -407,7 +407,7 @@ static const struct mf_field mf_fields[MFF_N_IDS] = {
{
MFF_ND_TARGET, "nd_target", NULL,
MF_FIELD_SIZES(ipv6),
- MFM_CIDR, 0,
+ MFM_FULLY, 0,
MFS_IPV6,
MFP_ND,
false,
@@ -783,11 +783,6 @@ mf_is_mask_valid(const struct mf_field *mf, const union mf_value *mask)
case MFM_FULLY:
return true;
-
- case MFM_CIDR:
- return (mf->n_bytes == 4
- ? ip_is_cidr(mask->be32)
- : ipv6_is_cidr(&mask->ipv6));
}
NOT_REACHED();
@@ -2060,12 +2055,14 @@ mf_from_ipv6_string(const struct mf_field *mf, const char *s,
netmask = strtok_r(NULL, "/", &save_ptr);
if (netmask) {
- int prefix = atoi(netmask);
- if (prefix <= 0 || prefix > 128) {
- free(str);
- return xasprintf("%s: prefix bits not between 1 and 128", s);
- } else {
- *mask = ipv6_create_mask(prefix);
+ if (inet_pton(AF_INET6, netmask, mask) != 1) {
+ int prefix = atoi(netmask);
+ if (prefix <= 0 || prefix > 128) {
+ free(str);
+ return xasprintf("%s: prefix bits not between 1 and 128", s);
+ } else {
+ *mask = ipv6_create_mask(prefix);
+ }
}
} else {
*mask = in6addr_exact;
diff --git a/lib/meta-flow.h b/lib/meta-flow.h
index 29e3fa7..ffde5cc 100644
--- a/lib/meta-flow.h
+++ b/lib/meta-flow.h
@@ -144,7 +144,6 @@ enum mf_prereqs {
enum mf_maskable {
MFM_NONE, /* No sub-field masking. */
MFM_FULLY, /* Every bit is individually maskable. */
- MFM_CIDR /* Contiguous low-order bits may be masked. */
};
/* How to format or parse a field's value. */
diff --git a/lib/packets.c b/lib/packets.c
index 833074c..5729167 100644
--- a/lib/packets.c
+++ b/lib/packets.c
@@ -350,7 +350,10 @@ ipv6_create_mask(int mask)
/* Given the IPv6 netmask 'netmask', returns the number of bits of the IPv6
* address that it specifies, that is, the number of 1-bits in 'netmask'.
- * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()). */
+ * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()).
+ *
+ * If 'netmask' is not a CIDR netmask (see ipv6_is_cidr()), the return value
+ * will still be in the valid range but isn't otherwise meaningful. */
int
ipv6_count_cidr_bits(const struct in6_addr *netmask)
{
@@ -358,8 +361,6 @@ ipv6_count_cidr_bits(const struct in6_addr *netmask)
int count = 0;
const uint8_t *netmaskp = &netmask->s6_addr[0];
- assert(ipv6_is_cidr(netmask));
-
for (i=0; i<16; i++) {
if (netmaskp[i] == 0xff) {
count += 8;
diff --git a/tests/ovs-ofctl.at b/tests/ovs-ofctl.at
index 959bdd2..291195a 100644
--- a/tests/ovs-ofctl.at
+++ b/tests/ovs-ofctl.at
@@ -350,14 +350,21 @@ NXM_NX_ARP_THA(0002e30f80a4)
NXM_OF_ETH_TYPE(86dd) NXM_NX_IPV6_SRC(20010db83c4d00010002000300040005)
NXM_OF_ETH_TYPE(0800) NXM_NX_IPV6_SRC(20010db83c4d00010002000300040005)
NXM_OF_ETH_TYPE(86dd) NXM_NX_IPV6_SRC_W(20010db83c4d00010000000000000000/ffffffffffffffff0000000000000000)
+NXM_OF_ETH_TYPE(86dd) NXM_NX_IPV6_SRC_W(20010db83c4d00010000000000000000/5a5a5a5a5a5a5a5a0000000000000000)
NXM_OF_ETH_TYPE(0800) NXM_NX_IPV6_SRC_W(20010db83c4d00010000000000000000/ffffffffffffffff0000000000000000)
# IPv6 destination
NXM_OF_ETH_TYPE(86dd) NXM_NX_IPV6_DST(20010db83c4d00010002000300040005)
NXM_OF_ETH_TYPE(0800) NXM_NX_IPV6_DST(20010db83c4d00010002000300040005)
-NXM_OF_ETH_TYPE(86dd) NXM_NX_IPV6_DST_W(20010db83c4d00010000000000000000/ffffffffffffffff0000000000000000)
+NXM_OF_ETH_TYPE(86dd) NXM_NX_IPV6_DST_W(20010db83c4d00010000000000000000/77777777777777777777777777777777)
NXM_OF_ETH_TYPE(0800) NXM_NX_IPV6_DST_W(20010db83c4d00010000000000000000/ffffffffffffffff0000000000000000)
+# ND target address
+NXM_OF_ETH_TYPE(86dd) NXM_OF_IP_PROTO(3a) NXM_NX_ICMPV6_TYPE(87) NXM_NX_ND_TARGET(20010db83c4d00010002000300040005)
+NXM_OF_ETH_TYPE(86dd) NXM_OF_IP_PROTO(3a) NXM_NX_ICMPV6_TYPE(88) NXM_NX_ND_TARGET(20010db83c4d00010002000300040005)
+NXM_OF_ETH_TYPE(86dd) NXM_OF_IP_PROTO(3a) NXM_NX_ICMPV6_TYPE(87) NXM_NX_ND_TARGET_W(20010db83c4d00010002000300040005/0123456789abcdeffedcba9876543210)
+NXM_OF_ETH_TYPE(86dd) NXM_OF_IP_PROTO(3a) NXM_NX_ICMPV6_TYPE(88) NXM_NX_ND_TARGET_W(20010db83c4d00010002000300040005/fedcba98765432100123456789abcdef)
+
# ND source hardware address
NXM_OF_ETH_TYPE(86dd) NXM_OF_IP_PROTO(3a) NXM_NX_ICMPV6_TYPE(87) NXM_NX_ND_TARGET(20010db83c4d00010002000300040005) NXM_NX_ND_SLL(0002e30f80a4)
NXM_OF_ETH_TYPE(86dd) NXM_OF_IP_PROTO(3a) NXM_NX_ICMPV6_TYPE(88) NXM_NX_ND_TARGET(20010db83c4d00010002000300040005) NXM_NX_ND_SLL(0002e30f80a4)
@@ -554,14 +561,21 @@ nx_pull_match() returned error OFPBMC_BAD_PREREQ
NXM_OF_ETH_TYPE(86dd), NXM_NX_IPV6_SRC(20010db83c4d00010002000300040005)
nx_pull_match() returned error OFPBMC_BAD_PREREQ
NXM_OF_ETH_TYPE(86dd), NXM_NX_IPV6_SRC_W(20010db83c4d00010000000000000000/ffffffffffffffff0000000000000000)
+NXM_OF_ETH_TYPE(86dd), NXM_NX_IPV6_SRC_W(00000818184800000000000000000000/5a5a5a5a5a5a5a5a0000000000000000)
nx_pull_match() returned error OFPBMC_BAD_PREREQ
# IPv6 destination
NXM_OF_ETH_TYPE(86dd), NXM_NX_IPV6_DST(20010db83c4d00010002000300040005)
nx_pull_match() returned error OFPBMC_BAD_PREREQ
-NXM_OF_ETH_TYPE(86dd), NXM_NX_IPV6_DST_W(20010db83c4d00010000000000000000/ffffffffffffffff0000000000000000)
+NXM_OF_ETH_TYPE(86dd), NXM_NX_IPV6_DST_W(20010530344500010000000000000000/77777777777777777777777777777777)
nx_pull_match() returned error OFPBMC_BAD_PREREQ
+# ND target address
+NXM_OF_ETH_TYPE(86dd), NXM_OF_IP_PROTO(3a), NXM_NX_ICMPV6_TYPE(87), NXM_NX_ND_TARGET(20010db83c4d00010002000300040005)
+NXM_OF_ETH_TYPE(86dd), NXM_OF_IP_PROTO(3a), NXM_NX_ICMPV6_TYPE(88), NXM_NX_ND_TARGET(20010db83c4d00010002000300040005)
+NXM_OF_ETH_TYPE(86dd), NXM_OF_IP_PROTO(3a), NXM_NX_ICMPV6_TYPE(87), NXM_NX_ND_TARGET_W(00010520080900010000000000040000/0123456789abcdeffedcba9876543210)
+NXM_OF_ETH_TYPE(86dd), NXM_OF_IP_PROTO(3a), NXM_NX_ICMPV6_TYPE(88), NXM_NX_ND_TARGET_W(20000898344400000002000300000005/fedcba98765432100123456789abcdef)
+
# ND source hardware address
NXM_OF_ETH_TYPE(86dd), NXM_OF_IP_PROTO(3a), NXM_NX_ICMPV6_TYPE(87), NXM_NX_ND_TARGET(20010db83c4d00010002000300040005), NXM_NX_ND_SLL(0002e30f80a4)
nx_pull_match() returned error OFPBMC_BAD_PREREQ
diff --git a/utilities/ovs-ofctl.8.in b/utilities/ovs-ofctl.8.in
index 4d34bd4..9c4ea0c 100644
--- a/utilities/ovs-ofctl.8.in
+++ b/utilities/ovs-ofctl.8.in
@@ -676,7 +676,11 @@ which may be specified as defined in RFC 2373. The preferred format is
address. A single instance of \fB::\fR may be used to indicate multiple
groups of 16-bits of zeros. The optional \fInetmask\fR allows
restricting a match to an IPv6 address prefix. A netmask is specified
-as a CIDR block (e.g. \fB2001:db8:3c4d:1::/64\fR).
+as an IPv6 address (e.g. \fB2001:db8:3c4d:1::/ffff:ffff:ffff:ffff::\fR)
+or a CIDR block (e.g. \fB2001:db8:3c4d:1::/64\fR). Open vSwitch 1.8
+and later support arbitrary masks; earlier versions support only CIDR
+masks, that is, CIDR block and IPv6 addresses that are equivalent to
+CIDR blocks.
.
.IP \fBipv6_label=\fIlabel\fR
When \fBdl_type\fR is 0x86dd (possibly via shorthand, e.g., \fBipv6\fR
--
1.7.2.5
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