vxlan: Flow based tunneling
Allows putting a VXLAN device into a new flow-based mode in which skbs with a ip_tunnel_info dst metadata attached will be encapsulated according to the instructions stored in there with the VXLAN device defaults taken into consideration. Similar on the receive side, if the VXLAN_F_COLLECT_METADATA flag is set, the packet processing will populate a ip_tunnel_info struct for each packet received and attach it to the skb using the new metadata dst. The metadata structure will contain the outer header and tunnel header fields which have been stripped off. Layers further up in the stack such as routing, tc or netfitler can later match on these fields and perform forwarding. It is the responsibility of upper layers to ensure that the flag is set if the metadata is needed. The flag limits the additional cost of metadata collecting based on demand. This prepares the VXLAN device to be steered by the routing and other subsystems which allows to support encapsulation for a large number of tunnel endpoints and tunnel ids through a single net_device which improves the scalability. It also allows for OVS to leverage this mode which in turn allows for the removal of the OVS specific VXLAN code. Because the skb is currently scrubed in vxlan_rcv(), the attachment of the new dst metadata is postponed until after scrubing which requires the temporary addition of a new member to vxlan_metadata. This member is removed again in a later commit after the indirect VXLAN receive API has been removed. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf
David S. Miller
Родитель
0accfc268f
Коммит
ee122c79d4
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@ -49,6 +49,7 @@
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#include <net/ip6_tunnel.h>
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#include <net/ip6_checksum.h>
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#endif
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#include <net/dst_metadata.h>
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#define VXLAN_VERSION "0.1"
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@ -140,6 +141,11 @@ struct vxlan_dev {
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static u32 vxlan_salt __read_mostly;
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static struct workqueue_struct *vxlan_wq;
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static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
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{
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return vs->flags & VXLAN_F_COLLECT_METADATA;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static inline
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bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
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@ -1164,10 +1170,13 @@ static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
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/* Callback from net/ipv4/udp.c to receive packets */
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static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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{
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struct metadata_dst *tun_dst = NULL;
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struct ip_tunnel_info *info;
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struct vxlan_sock *vs;
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struct vxlanhdr *vxh;
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u32 flags, vni;
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struct vxlan_metadata md = {0};
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struct vxlan_metadata _md;
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struct vxlan_metadata *md = &_md;
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/* Need Vxlan and inner Ethernet header to be present */
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if (!pskb_may_pull(skb, VXLAN_HLEN))
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@ -1202,6 +1211,33 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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vni &= VXLAN_VNI_MASK;
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}
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if (vxlan_collect_metadata(vs)) {
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const struct iphdr *iph = ip_hdr(skb);
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tun_dst = metadata_dst_alloc(sizeof(*md), GFP_ATOMIC);
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if (!tun_dst)
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goto drop;
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info = &tun_dst->u.tun_info;
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info->key.ipv4_src = iph->saddr;
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info->key.ipv4_dst = iph->daddr;
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info->key.ipv4_tos = iph->tos;
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info->key.ipv4_ttl = iph->ttl;
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info->key.tp_src = udp_hdr(skb)->source;
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info->key.tp_dst = udp_hdr(skb)->dest;
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info->mode = IP_TUNNEL_INFO_RX;
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info->key.tun_flags = TUNNEL_KEY;
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info->key.tun_id = cpu_to_be64(vni >> 8);
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if (udp_hdr(skb)->check != 0)
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info->key.tun_flags |= TUNNEL_CSUM;
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md = ip_tunnel_info_opts(info, sizeof(*md));
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md->tun_dst = tun_dst;
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} else {
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memset(md, 0, sizeof(*md));
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}
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/* For backwards compatibility, only allow reserved fields to be
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* used by VXLAN extensions if explicitly requested.
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*/
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@ -1209,13 +1245,16 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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struct vxlanhdr_gbp *gbp;
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gbp = (struct vxlanhdr_gbp *)vxh;
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md.gbp = ntohs(gbp->policy_id);
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md->gbp = ntohs(gbp->policy_id);
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if (tun_dst)
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info->key.tun_flags |= TUNNEL_VXLAN_OPT;
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if (gbp->dont_learn)
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md.gbp |= VXLAN_GBP_DONT_LEARN;
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md->gbp |= VXLAN_GBP_DONT_LEARN;
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if (gbp->policy_applied)
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md.gbp |= VXLAN_GBP_POLICY_APPLIED;
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md->gbp |= VXLAN_GBP_POLICY_APPLIED;
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flags &= ~VXLAN_GBP_USED_BITS;
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}
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@ -1233,8 +1272,8 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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goto bad_flags;
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}
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md.vni = vxh->vx_vni;
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vs->rcv(vs, skb, &md);
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md->vni = vxh->vx_vni;
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vs->rcv(vs, skb, md);
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return 0;
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drop:
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@ -1247,6 +1286,9 @@ bad_flags:
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ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
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error:
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if (tun_dst)
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dst_release((struct dst_entry *)tun_dst);
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/* Return non vxlan pkt */
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return 1;
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}
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@ -1263,7 +1305,12 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
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int err = 0;
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union vxlan_addr *remote_ip;
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vni = ntohl(md->vni) >> 8;
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/* For flow based devices, map all packets to VNI 0 */
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if (vs->flags & VXLAN_F_FLOW_BASED)
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vni = 0;
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else
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vni = ntohl(md->vni) >> 8;
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/* Is this VNI defined? */
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vxlan = vxlan_vs_find_vni(vs, vni);
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if (!vxlan)
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@ -1292,12 +1339,19 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
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#endif
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}
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if (md->tun_dst) {
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skb_dst_set(skb, (struct dst_entry *)md->tun_dst);
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md->tun_dst = NULL;
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}
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if ((vxlan->flags & VXLAN_F_LEARN) &&
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vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
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goto drop;
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skb_reset_network_header(skb);
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skb->mark = md->gbp;
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/* In flow-based mode, GBP is carried in dst_metadata */
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if (!(vs->flags & VXLAN_F_FLOW_BASED))
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skb->mark = md->gbp;
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if (oip6)
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err = IP6_ECN_decapsulate(oip6, skb);
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@ -1330,6 +1384,9 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
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return;
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drop:
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if (md->tun_dst)
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dst_release((struct dst_entry *)md->tun_dst);
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/* Consume bad packet */
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kfree_skb(skb);
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}
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@ -1878,22 +1935,40 @@ static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
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static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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struct vxlan_rdst *rdst, bool did_rsc)
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{
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struct ip_tunnel_info *info = skb_tunnel_info(skb);
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struct vxlan_dev *vxlan = netdev_priv(dev);
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struct sock *sk = vxlan->vn_sock->sock->sk;
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struct rtable *rt = NULL;
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const struct iphdr *old_iph;
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struct flowi4 fl4;
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union vxlan_addr *dst;
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struct vxlan_metadata md;
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union vxlan_addr remote_ip;
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struct vxlan_metadata _md;
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struct vxlan_metadata *md = &_md;
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__be16 src_port = 0, dst_port;
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u32 vni;
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__be16 df = 0;
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__u8 tos, ttl;
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int err;
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u32 flags = vxlan->flags;
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dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
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vni = rdst->remote_vni;
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dst = &rdst->remote_ip;
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if (rdst) {
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dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
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vni = rdst->remote_vni;
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dst = &rdst->remote_ip;
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} else {
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if (!info) {
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WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
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dev->name);
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goto drop;
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}
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dst_port = info->key.tp_dst ? : vxlan->dst_port;
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vni = be64_to_cpu(info->key.tun_id);
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remote_ip.sin.sin_family = AF_INET;
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remote_ip.sin.sin_addr.s_addr = info->key.ipv4_dst;
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dst = &remote_ip;
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}
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if (vxlan_addr_any(dst)) {
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if (did_rsc) {
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@ -1918,8 +1993,25 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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vxlan->port_max, true);
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if (dst->sa.sa_family == AF_INET) {
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if (info) {
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if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
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df = htons(IP_DF);
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if (info->key.tun_flags & TUNNEL_CSUM)
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flags |= VXLAN_F_UDP_CSUM;
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else
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flags &= ~VXLAN_F_UDP_CSUM;
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ttl = info->key.ipv4_ttl;
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tos = info->key.ipv4_tos;
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if (info->options_len)
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md = ip_tunnel_info_opts(info, sizeof(*md));
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} else {
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md->gbp = skb->mark;
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}
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memset(&fl4, 0, sizeof(fl4));
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fl4.flowi4_oif = rdst->remote_ifindex;
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fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
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fl4.flowi4_tos = RT_TOS(tos);
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fl4.flowi4_mark = skb->mark;
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fl4.flowi4_proto = IPPROTO_UDP;
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@ -1958,14 +2050,12 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
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ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
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md.vni = htonl(vni << 8);
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md.gbp = skb->mark;
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md->vni = htonl(vni << 8);
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err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
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dst->sin.sin_addr.s_addr, tos, ttl, df,
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src_port, dst_port, &md,
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src_port, dst_port, md,
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!net_eq(vxlan->net, dev_net(vxlan->dev)),
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vxlan->flags);
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flags);
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if (err < 0) {
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/* skb is already freed. */
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skb = NULL;
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@ -1980,7 +2070,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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u32 flags;
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memset(&fl6, 0, sizeof(fl6));
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fl6.flowi6_oif = rdst->remote_ifindex;
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fl6.flowi6_oif = rdst ? rdst->remote_ifindex : 0;
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fl6.daddr = dst->sin6.sin6_addr;
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fl6.saddr = vxlan->saddr.sin6.sin6_addr;
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fl6.flowi6_mark = skb->mark;
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@ -2018,11 +2108,11 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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}
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ttl = ttl ? : ip6_dst_hoplimit(ndst);
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md.vni = htonl(vni << 8);
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md.gbp = skb->mark;
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md->vni = htonl(vni << 8);
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md->gbp = skb->mark;
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err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
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0, ttl, src_port, dst_port, &md,
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0, ttl, src_port, dst_port, md,
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!net_eq(vxlan->net, dev_net(vxlan->dev)),
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vxlan->flags);
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#endif
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@ -2051,6 +2141,7 @@ tx_free:
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static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct vxlan_dev *vxlan = netdev_priv(dev);
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const struct ip_tunnel_info *info = skb_tunnel_info(skb);
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struct ethhdr *eth;
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bool did_rsc = false;
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struct vxlan_rdst *rdst, *fdst = NULL;
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@ -2078,6 +2169,12 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
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#endif
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}
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if (vxlan->flags & VXLAN_F_FLOW_BASED &&
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info && info->mode == IP_TUNNEL_INFO_TX) {
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vxlan_xmit_one(skb, dev, NULL, false);
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return NETDEV_TX_OK;
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}
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f = vxlan_find_mac(vxlan, eth->h_dest);
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did_rsc = false;
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@ -2405,6 +2502,7 @@ static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
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[IFLA_VXLAN_RSC] = { .type = NLA_U8 },
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[IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
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[IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
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[IFLA_VXLAN_FLOWBASED] = { .type = NLA_U8 },
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[IFLA_VXLAN_PORT] = { .type = NLA_U16 },
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[IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
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[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
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@ -2681,6 +2779,10 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
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if (data[IFLA_VXLAN_LIMIT])
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vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
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if (data[IFLA_VXLAN_FLOWBASED] &&
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nla_get_u8(data[IFLA_VXLAN_FLOWBASED]))
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vxlan->flags |= VXLAN_F_FLOW_BASED;
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if (data[IFLA_VXLAN_PORT_RANGE]) {
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const struct ifla_vxlan_port_range *p
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= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
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@ -2777,6 +2879,7 @@ static size_t vxlan_get_size(const struct net_device *dev)
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nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
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nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
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nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
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nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_FLOWBASED */
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nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
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nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
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nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
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|
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@ -2843,6 +2946,8 @@ static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
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!!(vxlan->flags & VXLAN_F_L2MISS)) ||
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nla_put_u8(skb, IFLA_VXLAN_L3MISS,
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!!(vxlan->flags & VXLAN_F_L3MISS)) ||
|
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nla_put_u8(skb, IFLA_VXLAN_FLOWBASED,
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!!(vxlan->flags & VXLAN_F_FLOW_BASED)) ||
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nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
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nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
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nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
|
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|
|
|
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|
|
@ -3469,5 +3469,6 @@ static inline unsigned int skb_gso_network_seglen(const struct sk_buff *skb)
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skb_network_header(skb);
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return hdr_len + skb_gso_transport_seglen(skb);
|
||||
}
|
||||
|
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#endif /* __KERNEL__ */
|
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#endif /* _LINUX_SKBUFF_H */
|
||||
|
|
|
|||
|
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@ -8,6 +8,9 @@
|
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struct metadata_dst {
|
||||
struct dst_entry dst;
|
||||
size_t opts_len;
|
||||
union {
|
||||
struct ip_tunnel_info tun_info;
|
||||
} u;
|
||||
};
|
||||
|
||||
static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb)
|
||||
|
|
@ -20,6 +23,16 @@ static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb)
|
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return NULL;
|
||||
}
|
||||
|
||||
static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb)
|
||||
{
|
||||
struct metadata_dst *md_dst = skb_metadata_dst(skb);
|
||||
|
||||
if (md_dst)
|
||||
return &md_dst->u.tun_info;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline bool skb_valid_dst(const struct sk_buff *skb)
|
||||
{
|
||||
struct dst_entry *dst = skb_dst(skb);
|
||||
|
|
|
|||
|
|
@ -38,10 +38,19 @@ struct ip_tunnel_key {
|
|||
__be16 tp_dst;
|
||||
} __packed __aligned(4); /* Minimize padding. */
|
||||
|
||||
/* Indicates whether the tunnel info structure represents receive
|
||||
* or transmit tunnel parameters.
|
||||
*/
|
||||
enum {
|
||||
IP_TUNNEL_INFO_RX,
|
||||
IP_TUNNEL_INFO_TX,
|
||||
};
|
||||
|
||||
struct ip_tunnel_info {
|
||||
struct ip_tunnel_key key;
|
||||
const void *options;
|
||||
u8 options_len;
|
||||
u8 mode;
|
||||
};
|
||||
|
||||
/* 6rd prefix/relay information */
|
||||
|
|
@ -284,6 +293,11 @@ static inline void iptunnel_xmit_stats(int err,
|
|||
}
|
||||
}
|
||||
|
||||
static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info, size_t n)
|
||||
{
|
||||
return info + 1;
|
||||
}
|
||||
|
||||
#endif /* CONFIG_INET */
|
||||
|
||||
#endif /* __NET_IP_TUNNELS_H */
|
||||
|
|
|
|||
|
|
@ -7,6 +7,7 @@
|
|||
#include <linux/skbuff.h>
|
||||
#include <linux/netdevice.h>
|
||||
#include <linux/udp.h>
|
||||
#include <net/dst_metadata.h>
|
||||
|
||||
#define VNI_HASH_BITS 10
|
||||
#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
|
||||
|
|
@ -97,6 +98,9 @@ struct vxlanhdr {
|
|||
struct vxlan_metadata {
|
||||
__be32 vni;
|
||||
u32 gbp;
|
||||
|
||||
/* Temporary until vxlan_rcv() API is gone */
|
||||
struct metadata_dst *tun_dst;
|
||||
};
|
||||
|
||||
struct vxlan_sock;
|
||||
|
|
@ -130,6 +134,8 @@ struct vxlan_sock {
|
|||
#define VXLAN_F_REMCSUM_RX 0x400
|
||||
#define VXLAN_F_GBP 0x800
|
||||
#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
|
||||
#define VXLAN_F_COLLECT_METADATA 0x2000
|
||||
#define VXLAN_F_FLOW_BASED 0x4000
|
||||
|
||||
/* Flags that are used in the receive path. These flags must match in
|
||||
* order for a socket to be shareable
|
||||
|
|
@ -137,7 +143,9 @@ struct vxlan_sock {
|
|||
#define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \
|
||||
VXLAN_F_UDP_ZERO_CSUM6_RX | \
|
||||
VXLAN_F_REMCSUM_RX | \
|
||||
VXLAN_F_REMCSUM_NOPARTIAL)
|
||||
VXLAN_F_REMCSUM_NOPARTIAL | \
|
||||
VXLAN_F_COLLECT_METADATA | \
|
||||
VXLAN_F_FLOW_BASED)
|
||||
|
||||
struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
|
||||
vxlan_rcv_t *rcv, void *data,
|
||||
|
|
|
|||
|
|
@ -382,6 +382,7 @@ enum {
|
|||
IFLA_VXLAN_REMCSUM_RX,
|
||||
IFLA_VXLAN_GBP,
|
||||
IFLA_VXLAN_REMCSUM_NOPARTIAL,
|
||||
IFLA_VXLAN_FLOWBASED,
|
||||
__IFLA_VXLAN_MAX
|
||||
};
|
||||
#define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
|
||||
|
|
|
|||
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