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