The patch adds support for ERSPAN tunnel over ipv6.
Signed-off-by: William Tu <u9012...@gmail.com>
---
include/net/ip6_tunnel.h | 1 +
net/ipv6/ip6_gre.c | 266 ++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 263 insertions(+), 4 deletions(-)
diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h
index d66f70f63734..3475dad0aa77 100644
--- a/include/net/ip6_tunnel.h
+++ b/include/net/ip6_tunnel.h
@@ -36,6 +36,7 @@ struct __ip6_tnl_parm {
__be32 o_key;
__u32 fwmark;
+ __u32 index; /* ERSPAN type II index */
};
/* IPv6 tunnel */
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 8c7612f32926..eb00a65f9d4c 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -55,6 +55,7 @@
#include <net/ip6_route.h>
#include <net/ip6_tunnel.h>
#include <net/gre.h>
+#include <net/erspan.h>
static bool log_ecn_error = true;
@@ -73,10 +74,12 @@ struct ip6gre_net {
static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
+static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
static int ip6gre_tunnel_init(struct net_device *dev);
static void ip6gre_tunnel_setup(struct net_device *dev);
static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
+static void ip6erspan_tap_setup(struct net_device *dev);
/* Tunnel hash table */
@@ -121,7 +124,8 @@ static struct ip6_tnl *ip6gre_tunnel_lookup(struct
net_device *dev,
unsigned int h1 = HASH_KEY(key);
struct ip6_tnl *t, *cand = NULL;
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
- int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
+ int dev_type = (gre_proto == htons(ETH_P_TEB) ||
+ gre_proto == htons(ETH_P_ERSPAN)) ?
ARPHRD_ETHER : ARPHRD_IP6GRE;
int score, cand_score = 4;
@@ -469,6 +473,40 @@ static int ip6gre_rcv(struct sk_buff *skb, const struct
tnl_ptk_info *tpi)
return PACKET_REJECT;
}
+static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
+ struct tnl_ptk_info *tpi)
+{
+ const struct ipv6hdr *ipv6h;
+ struct erspanhdr *ershdr;
+ struct ip6_tnl *tunnel;
+ __be32 index;
+
+ ipv6h = ipv6_hdr(skb);
+ ershdr = (struct erspanhdr *)skb->data;
+
+ if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
+ return PACKET_REJECT;
+
+ tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK);
+ index = ershdr->md.index;
+
+ tunnel = ip6gre_tunnel_lookup(skb->dev,
+ &ipv6h->saddr, &ipv6h->daddr, tpi->key,
+ tpi->proto);
+ if (tunnel) {
+ if (__iptunnel_pull_header(skb, sizeof(*ershdr),
+ htons(ETH_P_TEB),
+ false, false) < 0)
+ return PACKET_REJECT;
+
+ ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
+
+ return PACKET_RCVD;
+ }
+
+ return PACKET_RCVD;
+}
+
static int gre_rcv(struct sk_buff *skb)
{
struct tnl_ptk_info tpi;
@@ -482,6 +520,12 @@ static int gre_rcv(struct sk_buff *skb)
if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
goto drop;
+ if (unlikely(tpi.proto == htons(ETH_P_ERSPAN))) {
+ if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
+ return 0;
+ goto drop;
+ }
+
if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
return 0;
@@ -739,6 +783,84 @@ static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
}
+static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct dst_entry *dst = skb_dst(skb);
+ struct net_device_stats *stats;
+ int encap_limit = -1;
+ __u8 dsfield = false;
+ struct flowi6 fl6;
+ int err = -EINVAL;
+ bool truncate;
+ __u32 mtu;
+
+ stats = &t->dev->stats;
+
+ if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
+ goto tx_err;
+
+ if (gre_handle_offloads(skb, false))
+ goto tx_err;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
+ &dsfield, &encap_limit);
+ break;
+ case htons(ETH_P_IPV6):
+ if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
+ goto tx_err;
+ if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
+ &dsfield, &encap_limit))
+ goto tx_err;
+ break;
+ default:
+ memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
+ break;
+ }
+
+ if (skb->len > dev->mtu + dev->hard_header_len) {
+ pskb_trim(skb, dev->mtu + dev->hard_header_len);
+ truncate = true;
+ }
+
+ erspan_build_header(skb, t->parms.o_key, t->parms.index,
+ truncate, false);
+ t->parms.o_flags &= ~TUNNEL_KEY;
+
+ IPCB(skb)->flags = 0;
+ fl6.daddr = t->parms.raddr;
+
+ /* Push GRE header. */
+ gre_build_header(skb, 8, TUNNEL_SEQ,
+ htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
+
+ /* TooBig packet may have updated dst->dev's mtu */
+ if (dst && dst_mtu(dst) > dst->dev->mtu)
+ dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
+
+ err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
+ NEXTHDR_GRE);
+ if (err != 0) {
+ /* XXX: send ICMP error even if DF is not set. */
+ if (err == -EMSGSIZE)
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ htonl(mtu));
+ goto tx_err;
+ }
+ return NETDEV_TX_OK;
+
+tx_err:
+ stats->tx_errors++;
+ stats->tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
{
struct net_device *dev = t->dev;
@@ -1118,7 +1240,6 @@ static void ip6gre_fb_tunnel_init(struct net_device *dev)
dev_hold(dev);
}
-
static struct inet6_protocol ip6gre_protocol __read_mostly = {
.handler = gre_rcv,
.err_handler = ip6gre_err,
@@ -1133,7 +1254,8 @@ static void ip6gre_destroy_tunnels(struct net *net,
struct list_head *head)
for_each_netdev_safe(net, dev, aux)
if (dev->rtnl_link_ops == &ip6gre_link_ops ||
- dev->rtnl_link_ops == &ip6gre_tap_ops)
+ dev->rtnl_link_ops == &ip6gre_tap_ops ||
+ dev->rtnl_link_ops == &ip6erspan_tap_ops)
unregister_netdevice_queue(dev, head);
for (prio = 0; prio < 4; prio++) {
@@ -1255,6 +1377,47 @@ static int ip6gre_tap_validate(struct nlattr *tb[],
struct nlattr *data[],
return ip6gre_tunnel_validate(tb, data, extack);
}
+static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ __be16 flags = 0;
+ int ret;
+
+ if (!data)
+ return 0;
+
+ ret = ip6gre_tap_validate(tb, data, extack);
+ if (ret)
+ return ret;
+
+ /* ERSPAN should only have GRE sequence and key flag */
+ if (data[IFLA_GRE_OFLAGS])
+ flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
+ if (data[IFLA_GRE_IFLAGS])
+ flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
+ if (!data[IFLA_GRE_COLLECT_METADATA] &&
+ flags != (GRE_SEQ | GRE_KEY))
+ return -EINVAL;
+
+ /* ERSPAN Session ID only has 10-bit. Since we reuse
+ * 32-bit key field as ID, check it's range.
+ */
+ if (data[IFLA_GRE_IKEY] &&
+ (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
+ return -EINVAL;
+
+ if (data[IFLA_GRE_OKEY] &&
+ (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
+ return -EINVAL;
+
+ if (data[IFLA_GRE_ERSPAN_INDEX]) {
+ u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
+
+ if (index & ~INDEX_MASK)
+ return -EINVAL;
+ }
+ return 0;
+}
static void ip6gre_netlink_parms(struct nlattr *data[],
struct __ip6_tnl_parm *parms)
@@ -1301,6 +1464,9 @@ static void ip6gre_netlink_parms(struct nlattr *data[],
if (data[IFLA_GRE_FWMARK])
parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
+
+ if (data[IFLA_GRE_ERSPAN_INDEX])
+ parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
}
static int ip6gre_tap_init(struct net_device *dev)
@@ -1337,6 +1503,59 @@ static const struct net_device_ops ip6gre_tap_netdev_ops
= {
NETIF_F_HIGHDMA | \
NETIF_F_HW_CSUM)
+static int ip6erspan_tap_init(struct net_device *dev)
+{
+ struct ip6_tnl *tunnel;
+ int ret;
+ int t_hlen;
+
+ tunnel = netdev_priv(dev);
+
+ tunnel->dev = dev;
+ tunnel->net = dev_net(dev);
+ strcpy(tunnel->parms.name, dev->name);
+
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
+ if (ret) {
+ free_percpu(dev->tstats);
+ dev->tstats = NULL;
+ return ret;
+ }
+
+ tunnel->tun_hlen = 8;
+ tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
+ sizeof(struct erspanhdr);
+ t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
+
+ dev->hard_header_len = LL_MAX_HEADER + t_hlen;
+ dev->mtu = ETH_DATA_LEN - t_hlen;
+ if (dev->type == ARPHRD_ETHER)
+ dev->mtu -= ETH_HLEN;
+ if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ dev->mtu -= 8;
+
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+ tunnel = netdev_priv(dev);
+ ip6gre_tnl_link_config(tunnel, 1);
+
+ return 0;
+}
+
+static const struct net_device_ops ip6erspan_netdev_ops = {
+ .ndo_init = ip6erspan_tap_init,
+ .ndo_uninit = ip6gre_tunnel_uninit,
+ .ndo_start_xmit = ip6erspan_tunnel_xmit,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_change_mtu = ip6_tnl_change_mtu,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
+ .ndo_get_iflink = ip6_tnl_get_iflink,
+};
+
static void ip6gre_tap_setup(struct net_device *dev)
{
@@ -1528,6 +1747,8 @@ static size_t ip6gre_get_size(const struct net_device
*dev)
nla_total_size(2) +
/* IFLA_GRE_FWMARK */
nla_total_size(4) +
+ /* IFLA_GRE_ERSPAN_INDEX */
+ nla_total_size(4) +
0;
}
@@ -1549,7 +1770,8 @@ static int ip6gre_fill_info(struct sk_buff *skb, const
struct net_device *dev)
nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
- nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
+ nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
+ nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
goto nla_put_failure;
if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
@@ -1585,8 +1807,23 @@ static const struct nla_policy
ip6gre_policy[IFLA_GRE_MAX + 1] = {
[IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
[IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
[IFLA_GRE_FWMARK] = { .type = NLA_U32 },
+ [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
};
+static void ip6erspan_tap_setup(struct net_device *dev)
+{
+ ether_setup(dev);
+
+ dev->netdev_ops = &ip6erspan_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->priv_destructor = ip6gre_dev_free;
+
+ dev->features |= NETIF_F_NETNS_LOCAL;
+ dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+ netif_keep_dst(dev);
+}
+
static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
.kind = "ip6gre",
.maxtype = IFLA_GRE_MAX,
@@ -1616,6 +1853,20 @@ static struct rtnl_link_ops ip6gre_tap_ops __read_mostly
= {
.get_link_net = ip6_tnl_get_link_net,
};
+static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
+ .kind = "ip6erspan",
+ .maxtype = IFLA_GRE_MAX,
+ .policy = ip6gre_policy,
+ .priv_size = sizeof(struct ip6_tnl),
+ .setup = ip6erspan_tap_setup,
+ .validate = ip6erspan_tap_validate,
+ .newlink = ip6gre_newlink,
+ .changelink = ip6gre_changelink,
+ .get_size = ip6gre_get_size,
+ .fill_info = ip6gre_fill_info,
+ .get_link_net = ip6_tnl_get_link_net,
+};
+
/*
* And now the modules code and kernel interface.
*/
@@ -1644,9 +1895,15 @@ static int __init ip6gre_init(void)
if (err < 0)
goto tap_ops_failed;
+ err = rtnl_link_register(&ip6erspan_tap_ops);
+ if (err < 0)
+ goto erspan_link_failed;
+
out:
return err;
+erspan_link_failed:
+ rtnl_link_unregister(&ip6gre_tap_ops);
tap_ops_failed:
rtnl_link_unregister(&ip6gre_link_ops);
rtnl_link_failed:
@@ -1660,6 +1917,7 @@ static void __exit ip6gre_fini(void)
{
rtnl_link_unregister(&ip6gre_tap_ops);
rtnl_link_unregister(&ip6gre_link_ops);
+ rtnl_link_unregister(&ip6erspan_tap_ops);
inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
unregister_pernet_device(&ip6gre_net_ops);
}
--
2.7.4
