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authorJarno Rajahalme <jrajahalme@nicira.com>2013-10-23 01:44:59 -0700
committerJesse Gross <jesse@nicira.com>2013-11-01 18:43:45 -0700
commit5eb26b156e29eadcc21f73fb5d14497f0db24b86 (patch)
treec038f2ce812b576b011de5e640f6187447149e0e /net/openvswitch
parentdf23e9f642830f10c505c8a3d57772ad1238c701 (diff)
openvswitch: TCP flags matching support.
tcp_flags=flags/mask Bitwise match on TCP flags. The flags and mask are 16-bit num‐ bers written in decimal or in hexadecimal prefixed by 0x. Each 1-bit in mask requires that the corresponding bit in port must match. Each 0-bit in mask causes the corresponding bit to be ignored. TCP protocol currently defines 9 flag bits, and additional 3 bits are reserved (must be transmitted as zero), see RFCs 793, 3168, and 3540. The flag bits are, numbering from the least significant bit: 0: FIN No more data from sender. 1: SYN Synchronize sequence numbers. 2: RST Reset the connection. 3: PSH Push function. 4: ACK Acknowledgement field significant. 5: URG Urgent pointer field significant. 6: ECE ECN Echo. 7: CWR Congestion Windows Reduced. 8: NS Nonce Sum. 9-11: Reserved. 12-15: Not matchable, must be zero. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com> Signed-off-by: Jesse Gross <jesse@nicira.com>
Diffstat (limited to 'net/openvswitch')
-rw-r--r--net/openvswitch/flow.c2
-rw-r--r--net/openvswitch/flow.h2
-rw-r--r--net/openvswitch/flow_netlink.c31
3 files changed, 33 insertions, 2 deletions
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index b73c7680a3d..b409f527960 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -428,6 +428,7 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
struct tcphdr *tcp = tcp_hdr(skb);
key->ipv4.tp.src = tcp->source;
key->ipv4.tp.dst = tcp->dest;
+ key->ipv4.tp.flags = TCP_FLAGS_BE16(tcp);
}
} else if (key->ip.proto == IPPROTO_UDP) {
if (udphdr_ok(skb)) {
@@ -496,6 +497,7 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
struct tcphdr *tcp = tcp_hdr(skb);
key->ipv6.tp.src = tcp->source;
key->ipv6.tp.dst = tcp->dest;
+ key->ipv6.tp.flags = TCP_FLAGS_BE16(tcp);
}
} else if (key->ip.proto == NEXTHDR_UDP) {
if (udphdr_ok(skb)) {
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index 204e0ccd116..1510f51dbf7 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -93,6 +93,7 @@ struct sw_flow_key {
struct {
__be16 src; /* TCP/UDP/SCTP source port. */
__be16 dst; /* TCP/UDP/SCTP destination port. */
+ __be16 flags; /* TCP flags. */
} tp;
struct {
u8 sha[ETH_ALEN]; /* ARP source hardware address. */
@@ -109,6 +110,7 @@ struct sw_flow_key {
struct {
__be16 src; /* TCP/UDP/SCTP source port. */
__be16 dst; /* TCP/UDP/SCTP destination port. */
+ __be16 flags; /* TCP flags. */
} tp;
struct {
struct in6_addr target; /* ND target address. */
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index e04649c56a9..2bc1bc1aca3 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -114,6 +114,7 @@ static bool match_validate(const struct sw_flow_match *match,
mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
| (1 << OVS_KEY_ATTR_IPV6)
| (1 << OVS_KEY_ATTR_TCP)
+ | (1 << OVS_KEY_ATTR_TCP_FLAGS)
| (1 << OVS_KEY_ATTR_UDP)
| (1 << OVS_KEY_ATTR_SCTP)
| (1 << OVS_KEY_ATTR_ICMP)
@@ -154,8 +155,11 @@ static bool match_validate(const struct sw_flow_match *match,
if (match->key->ip.proto == IPPROTO_TCP) {
key_expected |= 1 << OVS_KEY_ATTR_TCP;
- if (match->mask && (match->mask->key.ip.proto == 0xff))
+ key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
+ if (match->mask && (match->mask->key.ip.proto == 0xff)) {
mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
+ mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
+ }
}
if (match->key->ip.proto == IPPROTO_ICMP) {
@@ -186,8 +190,11 @@ static bool match_validate(const struct sw_flow_match *match,
if (match->key->ip.proto == IPPROTO_TCP) {
key_expected |= 1 << OVS_KEY_ATTR_TCP;
- if (match->mask && (match->mask->key.ip.proto == 0xff))
+ key_expected |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
+ if (match->mask && (match->mask->key.ip.proto == 0xff)) {
mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
+ mask_allowed |= 1 << OVS_KEY_ATTR_TCP_FLAGS;
+ }
}
if (match->key->ip.proto == IPPROTO_ICMPV6) {
@@ -235,6 +242,7 @@ static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
[OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
[OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
[OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
+ [OVS_KEY_ATTR_TCP_FLAGS] = sizeof(__be16),
[OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
[OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp),
[OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
@@ -634,6 +642,19 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
attrs &= ~(1 << OVS_KEY_ATTR_TCP);
}
+ if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
+ if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
+ SW_FLOW_KEY_PUT(match, ipv4.tp.flags,
+ nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
+ is_mask);
+ } else {
+ SW_FLOW_KEY_PUT(match, ipv6.tp.flags,
+ nla_get_be16(a[OVS_KEY_ATTR_TCP_FLAGS]),
+ is_mask);
+ }
+ attrs &= ~(1 << OVS_KEY_ATTR_TCP_FLAGS);
+ }
+
if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
const struct ovs_key_udp *udp_key;
@@ -1004,9 +1025,15 @@ int ovs_nla_put_flow(const struct sw_flow_key *swkey,
if (swkey->eth.type == htons(ETH_P_IP)) {
tcp_key->tcp_src = output->ipv4.tp.src;
tcp_key->tcp_dst = output->ipv4.tp.dst;
+ if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
+ output->ipv4.tp.flags))
+ goto nla_put_failure;
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
tcp_key->tcp_src = output->ipv6.tp.src;
tcp_key->tcp_dst = output->ipv6.tp.dst;
+ if (nla_put_be16(skb, OVS_KEY_ATTR_TCP_FLAGS,
+ output->ipv6.tp.flags))
+ goto nla_put_failure;
}
} else if (swkey->ip.proto == IPPROTO_UDP) {
struct ovs_key_udp *udp_key;