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ip6_gre: add ip6 gre and gretap collect_md mode
Similar to gre, vxlan, geneve, ipip tunnels, allow ip6 gre and gretap tunnels to operate in collect metadata mode. bpf_skb_[gs]et_tunnel_key() helpers can make use of it right away. OVS can use it as well in the future. Signed-off-by: William Tu <u9012063@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu
David S. Miller
parent
c34bc2b505
commit
6712abc168
@ -56,6 +56,7 @@
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#include <net/ip6_tunnel.h>
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#include <net/gre.h>
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#include <net/erspan.h>
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#include <net/dst_metadata.h>
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static bool log_ecn_error = true;
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@ -69,6 +70,7 @@ static unsigned int ip6gre_net_id __read_mostly;
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struct ip6gre_net {
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struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
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struct ip6_tnl __rcu *collect_md_tun;
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struct net_device *fb_tunnel_dev;
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};
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@ -229,6 +231,10 @@ static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
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if (cand)
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return cand;
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t = rcu_dereference(ign->collect_md_tun);
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if (t && t->dev->flags & IFF_UP)
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return t;
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dev = ign->fb_tunnel_dev;
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if (dev->flags & IFF_UP)
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return netdev_priv(dev);
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@ -264,6 +270,9 @@ static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
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{
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struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
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if (t->parms.collect_md)
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rcu_assign_pointer(ign->collect_md_tun, t);
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rcu_assign_pointer(t->next, rtnl_dereference(*tp));
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rcu_assign_pointer(*tp, t);
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}
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@ -273,6 +282,9 @@ static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
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struct ip6_tnl __rcu **tp;
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struct ip6_tnl *iter;
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if (t->parms.collect_md)
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rcu_assign_pointer(ign->collect_md_tun, NULL);
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for (tp = ip6gre_bucket(ign, t);
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(iter = rtnl_dereference(*tp)) != NULL;
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tp = &iter->next) {
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@ -463,7 +475,22 @@ static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
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&ipv6h->saddr, &ipv6h->daddr, tpi->key,
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tpi->proto);
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if (tunnel) {
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ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
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if (tunnel->parms.collect_md) {
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struct metadata_dst *tun_dst;
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__be64 tun_id;
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__be16 flags;
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flags = tpi->flags;
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tun_id = key32_to_tunnel_id(tpi->key);
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tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
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if (!tun_dst)
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return PACKET_REJECT;
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ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
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} else {
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ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
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}
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return PACKET_RCVD;
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}
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@ -633,8 +660,38 @@ static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
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/* Push GRE header. */
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protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
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gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
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protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
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if (tunnel->parms.collect_md) {
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struct ip_tunnel_info *tun_info;
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const struct ip_tunnel_key *key;
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__be16 flags;
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tun_info = skb_tunnel_info(skb);
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if (unlikely(!tun_info ||
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!(tun_info->mode & IP_TUNNEL_INFO_TX) ||
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ip_tunnel_info_af(tun_info) != AF_INET6))
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return -EINVAL;
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key = &tun_info->key;
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memset(fl6, 0, sizeof(*fl6));
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fl6->flowi6_proto = IPPROTO_GRE;
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fl6->daddr = key->u.ipv6.dst;
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fl6->flowlabel = key->label;
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fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
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dsfield = key->tos;
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flags = key->tun_flags & (TUNNEL_CSUM | TUNNEL_KEY);
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tunnel->tun_hlen = gre_calc_hlen(flags);
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gre_build_header(skb, tunnel->tun_hlen,
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flags, protocol,
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tunnel_id_to_key32(tun_info->key.tun_id), 0);
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} else {
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gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
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protocol, tunnel->parms.o_key,
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htonl(tunnel->o_seqno));
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}
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return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
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NEXTHDR_GRE);
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@ -645,13 +702,15 @@ static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
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struct ip6_tnl *t = netdev_priv(dev);
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int encap_limit = -1;
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struct flowi6 fl6;
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__u8 dsfield;
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__u8 dsfield = 0;
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__u32 mtu;
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int err;
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memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
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prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, &dsfield, &encap_limit);
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if (!t->parms.collect_md)
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prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
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&dsfield, &encap_limit);
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err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
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if (err)
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@ -676,14 +735,15 @@ static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
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struct ipv6hdr *ipv6h = ipv6_hdr(skb);
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int encap_limit = -1;
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struct flowi6 fl6;
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__u8 dsfield;
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__u8 dsfield = 0;
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__u32 mtu;
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int err;
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if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
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return -1;
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if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
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if (!t->parms.collect_md &&
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prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
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return -1;
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if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
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@ -731,7 +791,8 @@ static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
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if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
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encap_limit = t->parms.encap_limit;
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memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
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if (!t->parms.collect_md)
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memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
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err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
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if (err)
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@ -1201,6 +1262,11 @@ static int ip6gre_tunnel_init_common(struct net_device *dev)
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if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
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dev->mtu -= 8;
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if (tunnel->parms.collect_md) {
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dev->features |= NETIF_F_NETNS_LOCAL;
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netif_keep_dst(dev);
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}
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return 0;
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}
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@ -1215,6 +1281,9 @@ static int ip6gre_tunnel_init(struct net_device *dev)
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tunnel = netdev_priv(dev);
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if (tunnel->parms.collect_md)
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return 0;
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memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
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memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
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@ -1464,6 +1533,9 @@ static void ip6gre_netlink_parms(struct nlattr *data[],
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if (data[IFLA_GRE_ERSPAN_INDEX])
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parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
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if (data[IFLA_GRE_COLLECT_METADATA])
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parms->collect_md = true;
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}
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static int ip6gre_tap_init(struct net_device *dev)
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@ -1622,8 +1694,13 @@ static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
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ip6gre_netlink_parms(data, &nt->parms);
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if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
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return -EEXIST;
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if (nt->parms.collect_md) {
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if (rtnl_dereference(ign->collect_md_tun))
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return -EEXIST;
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} else {
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if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
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return -EEXIST;
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}
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if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
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eth_hw_addr_random(dev);
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@ -1742,6 +1819,8 @@ static size_t ip6gre_get_size(const struct net_device *dev)
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nla_total_size(2) +
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/* IFLA_GRE_ENCAP_DPORT */
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nla_total_size(2) +
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/* IFLA_GRE_COLLECT_METADATA */
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nla_total_size(0) +
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/* IFLA_GRE_FWMARK */
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nla_total_size(4) +
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/* IFLA_GRE_ERSPAN_INDEX */
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@ -1781,6 +1860,11 @@ static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
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t->encap.flags))
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goto nla_put_failure;
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if (p->collect_md) {
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if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
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goto nla_put_failure;
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}
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return 0;
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nla_put_failure:
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@ -1803,6 +1887,7 @@ static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
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[IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
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[IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
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[IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
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[IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
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[IFLA_GRE_FWMARK] = { .type = NLA_U32 },
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[IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
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};
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@ -861,7 +861,7 @@ int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
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struct metadata_dst *tun_dst,
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bool log_ecn_err)
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{
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return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate,
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return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate,
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log_ecn_err);
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}
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EXPORT_SYMBOL(ip6_tnl_rcv);
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@ -979,6 +979,9 @@ int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
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int ret = 0;
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struct net *net = t->net;
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if (t->parms.collect_md)
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return 1;
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if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
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((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
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(ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
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