ip_gre: Add support to collect tunnel metadata.
Following patch create new tunnel flag which enable tunnel metadata collection on given device. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar
David S. Miller
Родитель
a9020fde67
Коммит
2e15ea390e
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@ -82,6 +82,8 @@ struct ip_tunnel_dst {
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__be32 saddr;
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};
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struct metadata_dst;
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struct ip_tunnel {
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struct ip_tunnel __rcu *next;
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struct hlist_node hash_node;
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@ -115,6 +117,7 @@ struct ip_tunnel {
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unsigned int prl_count; /* # of entries in PRL */
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int ip_tnl_net_id;
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struct gro_cells gro_cells;
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bool collect_md;
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};
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#define TUNNEL_CSUM __cpu_to_be16(0x01)
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@ -149,6 +152,7 @@ struct tnl_ptk_info {
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struct ip_tunnel_net {
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struct net_device *fb_tunnel_dev;
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struct hlist_head tunnels[IP_TNL_HASH_SIZE];
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struct ip_tunnel __rcu *collect_md_tun;
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};
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struct ip_tunnel_encap_ops {
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@ -235,7 +239,8 @@ struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
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__be32 key);
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int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
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const struct tnl_ptk_info *tpi, bool log_ecn_error);
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const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
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bool log_ecn_error);
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int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
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struct ip_tunnel_parm *p);
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int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
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@ -112,6 +112,7 @@ enum {
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IFLA_GRE_ENCAP_FLAGS,
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IFLA_GRE_ENCAP_SPORT,
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IFLA_GRE_ENCAP_DPORT,
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IFLA_GRE_COLLECT_METADATA,
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__IFLA_GRE_MAX,
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};
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@ -25,6 +25,7 @@
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#include <linux/udp.h>
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#include <linux/if_arp.h>
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#include <linux/mroute.h>
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#include <linux/if_vlan.h>
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#include <linux/init.h>
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#include <linux/in6.h>
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#include <linux/inetdevice.h>
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@ -47,6 +48,7 @@
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#include <net/netns/generic.h>
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#include <net/rtnetlink.h>
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#include <net/gre.h>
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#include <net/dst_metadata.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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@ -200,9 +202,29 @@ static int ipgre_err(struct sk_buff *skb, u32 info,
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return PACKET_RCVD;
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}
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static __be64 key_to_tunnel_id(__be32 key)
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{
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#ifdef __BIG_ENDIAN
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return (__force __be64)((__force u32)key);
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#else
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return (__force __be64)((__force u64)key << 32);
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#endif
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}
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/* Returns the least-significant 32 bits of a __be64. */
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static __be32 tunnel_id_to_key(__be64 x)
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{
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#ifdef __BIG_ENDIAN
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return (__force __be32)x;
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#else
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return (__force __be32)((__force u64)x >> 32);
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#endif
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}
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static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
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{
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struct net *net = dev_net(skb->dev);
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struct metadata_dst *tun_dst = NULL;
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struct ip_tunnel_net *itn;
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const struct iphdr *iph;
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struct ip_tunnel *tunnel;
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@ -218,40 +240,162 @@ static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
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if (tunnel) {
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skb_pop_mac_header(skb);
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ip_tunnel_rcv(tunnel, skb, tpi, log_ecn_error);
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if (tunnel->collect_md) {
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struct ip_tunnel_info *info;
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tun_dst = metadata_dst_alloc(0, GFP_ATOMIC);
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if (!tun_dst)
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return PACKET_REJECT;
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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->mode = IP_TUNNEL_INFO_RX;
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info->key.tun_flags = tpi->flags &
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(TUNNEL_CSUM | TUNNEL_KEY);
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info->key.tun_id = key_to_tunnel_id(tpi->key);
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info->key.tp_src = 0;
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info->key.tp_dst = 0;
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}
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ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
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return PACKET_RCVD;
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}
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return PACKET_REJECT;
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}
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static void build_header(struct sk_buff *skb, int hdr_len, __be16 flags,
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__be16 proto, __be32 key, __be32 seq)
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{
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struct gre_base_hdr *greh;
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skb_push(skb, hdr_len);
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skb_reset_transport_header(skb);
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greh = (struct gre_base_hdr *)skb->data;
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greh->flags = tnl_flags_to_gre_flags(flags);
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greh->protocol = proto;
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if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) {
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__be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
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if (flags & TUNNEL_SEQ) {
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*ptr = seq;
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ptr--;
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}
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if (flags & TUNNEL_KEY) {
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*ptr = key;
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ptr--;
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}
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if (flags & TUNNEL_CSUM &&
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!(skb_shinfo(skb)->gso_type &
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(SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {
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*ptr = 0;
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*(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0,
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skb->len, 0));
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}
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}
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}
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static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
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const struct iphdr *tnl_params,
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__be16 proto)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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struct tnl_ptk_info tpi;
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tpi.flags = tunnel->parms.o_flags;
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tpi.proto = proto;
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tpi.key = tunnel->parms.o_key;
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if (tunnel->parms.o_flags & TUNNEL_SEQ)
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tunnel->o_seqno++;
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tpi.seq = htonl(tunnel->o_seqno);
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/* Push GRE header. */
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gre_build_header(skb, &tpi, tunnel->tun_hlen);
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skb_set_inner_protocol(skb, tpi.proto);
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build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
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proto, tunnel->parms.o_key, htonl(tunnel->o_seqno));
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skb_set_inner_protocol(skb, proto);
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ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol);
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}
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static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ip_tunnel_info *tun_info;
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struct net *net = dev_net(dev);
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const struct ip_tunnel_key *key;
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struct flowi4 fl;
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struct rtable *rt;
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int min_headroom;
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int tunnel_hlen;
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__be16 df, flags;
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int err;
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tun_info = skb_tunnel_info(skb, AF_INET);
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if (unlikely(!tun_info || tun_info->mode != IP_TUNNEL_INFO_TX))
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goto err_free_skb;
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key = &tun_info->key;
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memset(&fl, 0, sizeof(fl));
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fl.daddr = key->ipv4_dst;
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fl.saddr = key->ipv4_src;
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fl.flowi4_tos = RT_TOS(key->ipv4_tos);
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fl.flowi4_mark = skb->mark;
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fl.flowi4_proto = IPPROTO_GRE;
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rt = ip_route_output_key(net, &fl);
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if (IS_ERR(rt))
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goto err_free_skb;
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tunnel_hlen = ip_gre_calc_hlen(key->tun_flags);
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min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
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+ tunnel_hlen + sizeof(struct iphdr);
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if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
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int head_delta = SKB_DATA_ALIGN(min_headroom -
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skb_headroom(skb) +
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16);
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err = pskb_expand_head(skb, max_t(int, head_delta, 0),
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0, GFP_ATOMIC);
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if (unlikely(err))
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goto err_free_rt;
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}
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/* Push Tunnel header. */
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skb = gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM));
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if (IS_ERR(skb)) {
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skb = NULL;
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goto err_free_rt;
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}
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flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY);
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build_header(skb, tunnel_hlen, flags, htons(ETH_P_TEB),
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tunnel_id_to_key(tun_info->key.tun_id), 0);
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df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
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err = iptunnel_xmit(skb->sk, rt, skb, fl.saddr,
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key->ipv4_dst, IPPROTO_GRE,
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key->ipv4_tos, key->ipv4_ttl, df, false);
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iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
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return;
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err_free_rt:
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ip_rt_put(rt);
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err_free_skb:
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kfree_skb(skb);
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dev->stats.tx_dropped++;
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}
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static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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const struct iphdr *tnl_params;
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if (tunnel->collect_md) {
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gre_fb_xmit(skb, dev);
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return NETDEV_TX_OK;
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}
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if (dev->header_ops) {
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/* Need space for new headers */
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if (skb_cow_head(skb, dev->needed_headroom -
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@ -277,7 +421,6 @@ static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
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goto out;
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__gre_xmit(skb, dev, tnl_params, skb->protocol);
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return NETDEV_TX_OK;
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free_skb:
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@ -292,6 +435,11 @@ static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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if (tunnel->collect_md) {
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gre_fb_xmit(skb, dev);
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return NETDEV_TX_OK;
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}
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skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM));
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if (IS_ERR(skb))
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goto out;
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@ -300,7 +448,6 @@ static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
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goto free_skb;
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__gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB));
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return NETDEV_TX_OK;
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free_skb:
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@ -596,8 +743,10 @@ out:
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return ipgre_tunnel_validate(tb, data);
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}
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static void ipgre_netlink_parms(struct nlattr *data[], struct nlattr *tb[],
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struct ip_tunnel_parm *parms)
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static void ipgre_netlink_parms(struct net_device *dev,
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struct nlattr *data[],
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struct nlattr *tb[],
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struct ip_tunnel_parm *parms)
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{
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memset(parms, 0, sizeof(*parms));
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@ -635,6 +784,12 @@ static void ipgre_netlink_parms(struct nlattr *data[], struct nlattr *tb[],
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if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC]))
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parms->iph.frag_off = htons(IP_DF);
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if (data[IFLA_GRE_COLLECT_METADATA]) {
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struct ip_tunnel *t = netdev_priv(dev);
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t->collect_md = true;
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}
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}
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/* This function returns true when ENCAP attributes are present in the nl msg */
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@ -712,7 +867,7 @@ static int ipgre_newlink(struct net *src_net, struct net_device *dev,
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return err;
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}
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ipgre_netlink_parms(data, tb, &p);
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ipgre_netlink_parms(dev, data, tb, &p);
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return ip_tunnel_newlink(dev, tb, &p);
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}
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@ -730,7 +885,7 @@ static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[],
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return err;
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}
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ipgre_netlink_parms(data, tb, &p);
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ipgre_netlink_parms(dev, data, tb, &p);
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return ip_tunnel_changelink(dev, tb, &p);
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}
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@ -765,6 +920,8 @@ static size_t ipgre_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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0;
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}
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@ -796,6 +953,11 @@ static int ipgre_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 (t->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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@ -817,6 +979,7 @@ static const struct nla_policy ipgre_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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};
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static struct rtnl_link_ops ipgre_link_ops __read_mostly = {
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|
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@ -851,7 +1014,7 @@ static struct rtnl_link_ops ipgre_tap_ops __read_mostly = {
|
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static int __net_init ipgre_tap_init_net(struct net *net)
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{
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return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, NULL);
|
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return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0");
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}
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|
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static void __net_exit ipgre_tap_exit_net(struct net *net)
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|
|
|
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|
|
@ -230,10 +230,13 @@ skip_key_lookup:
|
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if (cand)
|
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return cand;
|
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|
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t = rcu_dereference(itn->collect_md_tun);
|
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if (t)
|
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return t;
|
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|
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if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP)
|
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return netdev_priv(itn->fb_tunnel_dev);
|
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|
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|
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return NULL;
|
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}
|
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EXPORT_SYMBOL_GPL(ip_tunnel_lookup);
|
||||
|
|
@ -261,11 +264,15 @@ static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t)
|
|||
{
|
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struct hlist_head *head = ip_bucket(itn, &t->parms);
|
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|
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if (t->collect_md)
|
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rcu_assign_pointer(itn->collect_md_tun, t);
|
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hlist_add_head_rcu(&t->hash_node, head);
|
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}
|
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|
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static void ip_tunnel_del(struct ip_tunnel *t)
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static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t)
|
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{
|
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if (t->collect_md)
|
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rcu_assign_pointer(itn->collect_md_tun, NULL);
|
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hlist_del_init_rcu(&t->hash_node);
|
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}
|
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|
||||
|
|
@ -419,7 +426,8 @@ static struct ip_tunnel *ip_tunnel_create(struct net *net,
|
|||
}
|
||||
|
||||
int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
|
||||
const struct tnl_ptk_info *tpi, bool log_ecn_error)
|
||||
const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
|
||||
bool log_ecn_error)
|
||||
{
|
||||
struct pcpu_sw_netstats *tstats;
|
||||
const struct iphdr *iph = ip_hdr(skb);
|
||||
|
|
@ -478,6 +486,9 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
|
|||
skb->dev = tunnel->dev;
|
||||
}
|
||||
|
||||
if (tun_dst)
|
||||
skb_dst_set(skb, (struct dst_entry *)tun_dst);
|
||||
|
||||
gro_cells_receive(&tunnel->gro_cells, skb);
|
||||
return 0;
|
||||
|
||||
|
|
@ -806,7 +817,7 @@ static void ip_tunnel_update(struct ip_tunnel_net *itn,
|
|||
struct ip_tunnel_parm *p,
|
||||
bool set_mtu)
|
||||
{
|
||||
ip_tunnel_del(t);
|
||||
ip_tunnel_del(itn, t);
|
||||
t->parms.iph.saddr = p->iph.saddr;
|
||||
t->parms.iph.daddr = p->iph.daddr;
|
||||
t->parms.i_key = p->i_key;
|
||||
|
|
@ -967,7 +978,7 @@ void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
|
|||
itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id);
|
||||
|
||||
if (itn->fb_tunnel_dev != dev) {
|
||||
ip_tunnel_del(netdev_priv(dev));
|
||||
ip_tunnel_del(itn, netdev_priv(dev));
|
||||
unregister_netdevice_queue(dev, head);
|
||||
}
|
||||
}
|
||||
|
|
@ -1072,8 +1083,13 @@ int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
|
|||
nt = netdev_priv(dev);
|
||||
itn = net_generic(net, nt->ip_tnl_net_id);
|
||||
|
||||
if (ip_tunnel_find(itn, p, dev->type))
|
||||
return -EEXIST;
|
||||
if (nt->collect_md) {
|
||||
if (rtnl_dereference(itn->collect_md_tun))
|
||||
return -EEXIST;
|
||||
} else {
|
||||
if (ip_tunnel_find(itn, p, dev->type))
|
||||
return -EEXIST;
|
||||
}
|
||||
|
||||
nt->net = net;
|
||||
nt->parms = *p;
|
||||
|
|
@ -1089,7 +1105,6 @@ int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
|
|||
dev->mtu = mtu;
|
||||
|
||||
ip_tunnel_add(itn, nt);
|
||||
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
|
@ -1163,6 +1178,10 @@ int ip_tunnel_init(struct net_device *dev)
|
|||
iph->version = 4;
|
||||
iph->ihl = 5;
|
||||
|
||||
if (tunnel->collect_md) {
|
||||
dev->features |= NETIF_F_NETNS_LOCAL;
|
||||
netif_keep_dst(dev);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ip_tunnel_init);
|
||||
|
|
@ -1176,7 +1195,7 @@ void ip_tunnel_uninit(struct net_device *dev)
|
|||
itn = net_generic(net, tunnel->ip_tnl_net_id);
|
||||
/* fb_tunnel_dev will be unregisted in net-exit call. */
|
||||
if (itn->fb_tunnel_dev != dev)
|
||||
ip_tunnel_del(netdev_priv(dev));
|
||||
ip_tunnel_del(itn, netdev_priv(dev));
|
||||
|
||||
ip_tunnel_dst_reset_all(tunnel);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -198,7 +198,7 @@ static int ipip_rcv(struct sk_buff *skb)
|
|||
goto drop;
|
||||
if (iptunnel_pull_header(skb, 0, tpi.proto))
|
||||
goto drop;
|
||||
return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
|
||||
return ip_tunnel_rcv(tunnel, skb, &tpi, NULL, log_ecn_error);
|
||||
}
|
||||
|
||||
return -1;
|
||||
|
|
|
|||
|
|
@ -742,7 +742,7 @@ static int ipip_rcv(struct sk_buff *skb)
|
|||
goto drop;
|
||||
if (iptunnel_pull_header(skb, 0, tpi.proto))
|
||||
goto drop;
|
||||
return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
|
||||
return ip_tunnel_rcv(tunnel, skb, &tpi, NULL, log_ecn_error);
|
||||
}
|
||||
|
||||
return 1;
|
||||
|
|
|
|||
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