[ovs-dev] [PATCH net-next V14 3/3] openvswitch: 802.1ad: Flow handling, actions, vlan parsing and netlink attributes
Thomas F Herbert
thomasfherbert at gmail.com
Fri Oct 2 21:48:34 UTC 2015
On 9/30/15 11:33 PM, Thomas F Herbert wrote:
> Add support for 802.1ad including the ability to push and pop double
> tagged vlans. Add support for 802.1ad to netlink parsing and flow
> conversion. Uses double nested encap attributes to represent double
> tagged vlan. Inner TPID encoded along with ctci in nested attributes.
>
> Signed-off-by: Thomas F Herbert <thomasfherbert at gmail.com>
> ---
> net/openvswitch/actions.c | 4 +-
> net/openvswitch/flow.c | 87 +++++++++++++++++----
> net/openvswitch/flow.h | 11 ++-
> net/openvswitch/flow_netlink.c | 167 +++++++++++++++++++++++++++++++++++++----
> net/openvswitch/vport-netdev.c | 4 +-
> 5 files changed, 239 insertions(+), 34 deletions(-)
>
> diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
> index 315f533..c544371 100644
> --- a/net/openvswitch/actions.c
> +++ b/net/openvswitch/actions.c
> @@ -236,7 +236,7 @@ static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
> if (skb_vlan_tag_present(skb))
> invalidate_flow_key(key);
> else
> - key->eth.tci = 0;
> + key->eth.vlan.tci = 0;
> return err;
> }
>
> @@ -246,7 +246,7 @@ static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
> if (skb_vlan_tag_present(skb))
> invalidate_flow_key(key);
> else
> - key->eth.tci = vlan->vlan_tci;
> + key->eth.vlan.tci = vlan->vlan_tci;
> return skb_vlan_push(skb, vlan->vlan_tpid,
> ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
> }
> diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
> index c8db44a..86a2cb0 100644
> --- a/net/openvswitch/flow.c
> +++ b/net/openvswitch/flow.c
> @@ -305,21 +305,78 @@ static bool icmp6hdr_ok(struct sk_buff *skb)
> static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
> {
> struct qtag_prefix {
> - __be16 eth_type; /* ETH_P_8021Q */
> + __be16 eth_type; /* ETH_P_8021Q or ETH_P_8021AD */
> __be16 tci;
> };
> - struct qtag_prefix *qp;
> + struct qtag_prefix *qp = (struct qtag_prefix *)skb->data;
>
> - if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
> + struct qinqtag_prefix {
> + __be16 eth_type; /* ETH_P_8021Q or ETH_P_8021AD */
> + __be16 tci;
> + __be16 inner_tpid; /* ETH_P_8021Q */
> + __be16 ctci;
> + };
> +
> + if (likely(skb_vlan_tag_present(skb))) {
> + key->eth.vlan.tci = htons(skb->vlan_tci);
> + key->eth.vlan.tpid = skb->vlan_proto;
> +
> + /* Case where upstream
> + * processing has already stripped the outer vlan tag.
> + */
> + if (unlikely(skb->vlan_proto == htons(ETH_P_8021AD))) {
> + if (unlikely(skb->len < sizeof(struct qtag_prefix) +
> + sizeof(__be16))) {
> + key->eth.vlan.tci = 0;
> + return 0;
> + }
> +
> + if (unlikely(!pskb_may_pull(skb,
> + sizeof(struct qtag_prefix) +
> + sizeof(__be16))))
> + return -ENOMEM;
> +
> + key->eth.cvlan.tci =
> + qp->tci | htons(VLAN_TAG_PRESENT);
> + key->eth.cvlan.tpid = qp->eth_type;
> +
> + __skb_pull(skb, sizeof(struct qtag_prefix));
> + }
> return 0;
>
> - if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
> - sizeof(__be16))))
> - return -ENOMEM;
> + } else if (qp->eth_type == htons(ETH_P_8021AD)) {
> + struct qinqtag_prefix *qinqp =
> + (struct qinqtag_prefix *)skb->data;
> +
> + if (unlikely(skb->len < sizeof(struct qinqtag_prefix) +
> + sizeof(__be16)))
> + return 0;
> +
> + if (unlikely(!pskb_may_pull(skb, sizeof(struct qinqtag_prefix) +
> + sizeof(__be16))))
> + return -ENOMEM;
> + key->eth.vlan.tci = qinqp->tci | htons(VLAN_TAG_PRESENT);
> + key->eth.vlan.tpid = qp->eth_type;
> + key->eth.cvlan.tci = qinqp->ctci | htons(VLAN_TAG_PRESENT);
> + key->eth.cvlan.tpid = qinqp->inner_tpid;
> +
> + __skb_pull(skb, sizeof(struct qinqtag_prefix));
>
> - qp = (struct qtag_prefix *) skb->data;
> - key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
> - __skb_pull(skb, sizeof(struct qtag_prefix));
> + return 0;
> +
> + } else if (qp->eth_type == htons(ETH_P_8021Q)) {
> + if (unlikely(skb->len < sizeof(struct qtag_prefix) +
> + sizeof(__be16)))
> + return 0;
> +
> + if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
> + sizeof(__be16))))
> + return -ENOMEM;
> + key->eth.vlan.tci = qp->tci | htons(VLAN_TAG_PRESENT);
> + key->eth.vlan.tpid = qp->eth_type;
> +
> + __skb_pull(skb, sizeof(struct qtag_prefix));
> + }
>
> return 0;
> }
> @@ -480,12 +537,12 @@ static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
> * update skb->csum here.
> */
>
> - key->eth.tci = 0;
> - if (skb_vlan_tag_present(skb))
> - key->eth.tci = htons(skb->vlan_tci);
> - else if (eth->h_proto == htons(ETH_P_8021Q))
> - if (unlikely(parse_vlan(skb, key)))
> - return -ENOMEM;
> + key->eth.vlan.tci = 0;
> + key->eth.vlan.tpid = 0;
> + key->eth.cvlan.tci = 0;
> + key->eth.cvlan.tpid = 0;
> + if (unlikely(parse_vlan(skb, key)))
> + return -ENOMEM;
>
> key->eth.type = parse_ethertype(skb);
> if (unlikely(key->eth.type == htons(0)))
> diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
> index fe527d2..539494e 100644
> --- a/net/openvswitch/flow.h
> +++ b/net/openvswitch/flow.h
> @@ -68,7 +68,16 @@ struct sw_flow_key {
> struct {
> u8 src[ETH_ALEN]; /* Ethernet source address. */
> u8 dst[ETH_ALEN]; /* Ethernet destination address. */
> - __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
> + struct {
> + __be16 tpid; /* Outer Vlan type 802.1q or 802.1ad.*/
> + __be16 tci; /* 0 if no VLAN, VLAN_TAG_PRESENT */
> + /* set otherwise. */
> + } vlan;
> + struct {
> + __be16 tpid; /* Inner Vlan DL_type 802.1q.*/
> + __be16 tci; /* 0 if no CVLAN, VLAN_TAG_PRESENT */
> + /* set otherwise. */
> + } cvlan;
> __be16 type; /* Ethernet frame type. */
> } eth;
> union {
> diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
> index c92d6a2..08f56ab 100644
> --- a/net/openvswitch/flow_netlink.c
> +++ b/net/openvswitch/flow_netlink.c
> @@ -811,6 +811,27 @@ static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
> return 0;
> }
>
> +static int cust_vlan_from_nlattrs(struct sw_flow_match *match,
> + const struct nlattr *a[],
> + bool is_mask, bool log)
> +{
> + __be16 ctci = 0;
> + __be16 c_tpid = 0;
> +
> + ctci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
> + if (!(ctci & htons(VLAN_TAG_PRESENT))) {
> + if (is_mask)
> + OVS_NLERR(log, "VLAN CTCI mask does not have exact match for VLAN_TAG_PRESENT bit.");
> + else
> + OVS_NLERR(log, "VLAN CTCI does not have VLAN_TAG_PRESENT bit set.");
> + return -EINVAL;
> + }
> + c_tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
> + SW_FLOW_KEY_PUT(match, eth.cvlan.tpid, c_tpid, is_mask);
> + SW_FLOW_KEY_PUT(match, eth.cvlan.tci, ctci, is_mask);
> + return 0;
> +}
> +
> static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
> u64 attrs, const struct nlattr **a,
> bool is_mask, bool log)
> @@ -845,7 +866,7 @@ static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
> return -EINVAL;
> }
>
> - SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
> + SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask);
> attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
> }
>
> @@ -1064,6 +1085,93 @@ static void mask_set_nlattr(struct nlattr *attr, u8 val)
> nlattr_set(attr, val, ovs_key_lens);
> }
>
> +static int parse_vlan_from_nlattrs(const struct nlattr **nla,
> + struct sw_flow_match *match,
> + u64 *key_attrs, bool *ie_valid,
> + const struct nlattr **a, bool is_mask,
> + bool log)
> +{
> + int err;
> + const struct nlattr *encap;
> +
> + if (!is_mask) {
> + u64 v_attrs = 0;
> +
> + err = parse_flow_nlattrs(*nla, a, &v_attrs, log);
> + if (err)
> + return err;
> + /* Another encap attribute here indicates
> + * the presence of a double tagged vlan.
> + */
> + if ((v_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
> + eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]))) {
> + if (!((v_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
> + (v_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
> + OVS_NLERR(log, "Invalid Inner VLAN frame");
> + return -EINVAL;
> + }
> + SW_FLOW_KEY_PUT(match, eth.vlan.tpid,
> + nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]),
> + is_mask);
> + encap = a[OVS_KEY_ATTR_ENCAP];
> + v_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
> +
> + err = cust_vlan_from_nlattrs(match, a, is_mask, log);
> + if (err)
> + return err;
> + *ie_valid = true;
> + *nla = encap;
> +
> + /* Insure that tci key attribute isn't
> + * overwritten by encapsulated customer tci.
> + * Ethertype is cleared because it is c_tpid.
> + */
> + v_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
> + v_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
> + }
> + *key_attrs |= v_attrs;
> +
> + if (*ie_valid) {
> + err = parse_flow_nlattrs(*nla, a, key_attrs, log);
> + if (err)
> + return err;
> + }
> +
> + } else {
> + u64 mask_v_attrs = 0;
> +
> + err = parse_flow_mask_nlattrs(*nla, a, &mask_v_attrs, log);
> + if (err)
> + return err;
> +
> + if (mask_v_attrs & 1 << OVS_KEY_ATTR_ENCAP) {
> + if (!*ie_valid) {
> + OVS_NLERR(log, "Encap mask attribute is set for non-CVLAN frame.");
> + err = -EINVAL;
> + return err;
> + }
> + encap = a[OVS_KEY_ATTR_ENCAP];
> + mask_v_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
> +
> + err = cust_vlan_from_nlattrs(match, a, is_mask, log);
> + if (err)
> + return err;
> + *nla = encap;
> +
> + mask_v_attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
> + mask_v_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
> + }
> +
> + *key_attrs |= mask_v_attrs;
> + if (*ie_valid) {
Pravin, could you please review the above code encoding the netmask of
the tpids. I am seeing a duplicate key (Type 6, ethertype key)
discovered by parse_vlan_from_nlattrs() below which I noticed (chagrined
I am) only after submitting this patch.
> + err = parse_flow_mask_nlattrs(*nla, a, key_attrs, log);
> + if (err)
> + return err;
> + }
> + }
> + return 0;
> +}
> +
> /**
> * ovs_nla_get_match - parses Netlink attributes into a flow key and
> * mask. In case the 'mask' is NULL, the flow is treated as exact match
> @@ -1091,6 +1199,7 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
> u64 key_attrs = 0;
> u64 mask_attrs = 0;
> bool encap_valid = false;
> + bool i_encap_valid = false;
> int err;
>
> err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
> @@ -1099,11 +1208,11 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
>
> if ((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
> (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
> - (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
> + eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]))) {
> __be16 tci;
>
> - if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
> - (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
> + if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
> + (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
> OVS_NLERR(log, "Invalid Vlan frame.");
> return -EINVAL;
> }
> @@ -1115,9 +1224,12 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
> encap_valid = true;
>
> if (tci & htons(VLAN_TAG_PRESENT)) {
> - err = parse_flow_nlattrs(encap, a, &key_attrs, log);
> + err = parse_vlan_from_nlattrs(&encap, match, &key_attrs,
> + &i_encap_valid, a, false,
> + log);
> if (err)
> return err;
> +
> } else if (!tci) {
> /* Corner case for truncated 802.1Q header. */
> if (nla_len(encap)) {
> @@ -1169,7 +1281,7 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
> goto free_newmask;
>
> /* Always match on tci. */
> - SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
> + SW_FLOW_KEY_PUT(match, eth.vlan.tci, htons(0xffff), true);
>
> if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP) {
> __be16 eth_type = 0;
> @@ -1188,10 +1300,13 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
> if (eth_type == htons(0xffff)) {
> mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
> encap = a[OVS_KEY_ATTR_ENCAP];
> - err = parse_flow_mask_nlattrs(encap, a,
> - &mask_attrs, log);
> + err = parse_vlan_from_nlattrs(&encap, match,
> + &mask_attrs,
> + &i_encap_valid,
> + a, true, log);
> if (err)
> goto free_newmask;
> +
> } else {
> OVS_NLERR(log, "VLAN frames must have an exact match on the TPID (mask=%x).",
> ntohs(eth_type));
> @@ -1320,6 +1435,7 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
> {
> struct ovs_key_ethernet *eth_key;
> struct nlattr *nla, *encap;
> + struct nlattr *in_encap = NULL;
>
> if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
> goto nla_put_failure;
> @@ -1368,17 +1484,36 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
> ether_addr_copy(eth_key->eth_src, output->eth.src);
> ether_addr_copy(eth_key->eth_dst, output->eth.dst);
>
> - if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
> + if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) {
> __be16 eth_type;
> - eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
> +
> + eth_type = !is_mask ? output->eth.vlan.tpid : htons(0xffff);
> +
> if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
> - nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
> + nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.vlan.tci))
> goto nla_put_failure;
> encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
> - if (!swkey->eth.tci)
> + if (!swkey->eth.vlan.tci)
> goto unencap;
> - } else
> + if (swkey->eth.cvlan.tci) {
> + __be16 eth_type;
> +
> + /* Customer tci is nested but uses same key attribute.
> + */
> + eth_type = !is_mask ? output->eth.cvlan.tpid :
> + htons(0xffff);
> + if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
> + eth_type) ||
> + nla_put_be16(skb, OVS_KEY_ATTR_VLAN,
> + output->eth.cvlan.tci))
> + goto nla_put_failure;
> + in_encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
> + if (!swkey->eth.cvlan.tci)
> + goto unencap;
> + }
> + } else {
> encap = NULL;
> + }
>
> if (swkey->eth.type == htons(ETH_P_802_2)) {
> /*
> @@ -1525,6 +1660,8 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
> unencap:
> if (encap)
> nla_nest_end(skb, encap);
> + if (in_encap)
> + nla_nest_end(skb, in_encap);
>
> return 0;
>
> @@ -2174,7 +2311,7 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
>
> case OVS_ACTION_ATTR_PUSH_VLAN:
> vlan = nla_data(a);
> - if (vlan->vlan_tpid != htons(ETH_P_8021Q))
> + if (!eth_type_vlan(vlan->vlan_tpid))
> return -EINVAL;
> if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
> return -EINVAL;
> @@ -2279,7 +2416,7 @@ int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
>
> (*sfa)->orig_len = nla_len(attr);
> err = __ovs_nla_copy_actions(net, attr, key, 0, sfa, key->eth.type,
> - key->eth.tci, log);
> + key->eth.vlan.tci, log);
> if (err)
> ovs_nla_free_flow_actions(*sfa);
>
> diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
> index f7e8dcc..d2581b7 100644
> --- a/net/openvswitch/vport-netdev.c
> +++ b/net/openvswitch/vport-netdev.c
> @@ -194,7 +194,9 @@ static unsigned int packet_length(const struct sk_buff *skb)
> {
> unsigned int length = skb->len - ETH_HLEN;
>
> - if (skb->protocol == htons(ETH_P_8021Q))
> + if (eth_type_vlan(skb->protocol))
> + length -= VLAN_HLEN;
> + if (skb->protocol == htons(ETH_P_8021AD))
> length -= VLAN_HLEN;
>
> return length;
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