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-rw-r--r--net/ipv6/sit.c119
1 files changed, 116 insertions, 3 deletions
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 335363478bbf..6b9c1f128eaf 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -577,6 +577,10 @@ static int ipip6_rcv(struct sk_buff *skb)
if (tunnel != NULL) {
struct pcpu_tstats *tstats;
+ if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
+ tunnel->parms.iph.protocol != 0)
+ goto out;
+
secpath_reset(skb);
skb->mac_header = skb->network_header;
skb_reset_network_header(skb);
@@ -629,6 +633,35 @@ out:
return 0;
}
+static const struct tnl_ptk_info tpi = {
+ /* no tunnel info required for ipip. */
+ .proto = htons(ETH_P_IP),
+};
+
+static int ipip_rcv(struct sk_buff *skb)
+{
+ const struct iphdr *iph = ip_hdr(skb);
+ struct ip_tunnel *tunnel;
+
+ tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
+ iph->saddr, iph->daddr);
+ if (tunnel != NULL) {
+ if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
+ tunnel->parms.iph.protocol != 0)
+ goto drop;
+
+ if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
+ goto drop;
+ return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
+ }
+
+ return 1;
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
/*
* If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
* stores the embedded IPv4 address in v4dst and returns true.
@@ -877,6 +910,43 @@ tx_error:
return NETDEV_TX_OK;
}
+static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ const struct iphdr *tiph = &tunnel->parms.iph;
+
+ if (likely(!skb->encapsulation)) {
+ skb_reset_inner_headers(skb);
+ skb->encapsulation = 1;
+ }
+
+ ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
+ return NETDEV_TX_OK;
+}
+
+static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ ipip_tunnel_xmit(skb, dev);
+ break;
+ case htons(ETH_P_IPV6):
+ ipip6_tunnel_xmit(skb, dev);
+ break;
+ default:
+ goto tx_err;
+ }
+
+ return NETDEV_TX_OK;
+
+tx_err:
+ dev->stats.tx_errors++;
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+
+}
+
static void ipip6_tunnel_bind_dev(struct net_device *dev)
{
struct net_device *tdev = NULL;
@@ -1027,7 +1097,11 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
goto done;
err = -EINVAL;
- if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
+ if (p.iph.protocol != IPPROTO_IPV6 &&
+ p.iph.protocol != IPPROTO_IPIP &&
+ p.iph.protocol != 0)
+ goto done;
+ if (p.iph.version != 4 ||
p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
goto done;
if (p.iph.ttl)
@@ -1164,7 +1238,7 @@ static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
static const struct net_device_ops ipip6_netdev_ops = {
.ndo_uninit = ipip6_tunnel_uninit,
- .ndo_start_xmit = ipip6_tunnel_xmit,
+ .ndo_start_xmit = sit_tunnel_xmit,
.ndo_do_ioctl = ipip6_tunnel_ioctl,
.ndo_change_mtu = ipip6_tunnel_change_mtu,
.ndo_get_stats64 = ip_tunnel_get_stats64,
@@ -1232,6 +1306,22 @@ static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
return 0;
}
+static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+ u8 proto;
+
+ if (!data)
+ return 0;
+
+ proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+ if (proto != IPPROTO_IPV6 &&
+ proto != IPPROTO_IPIP &&
+ proto != 0)
+ return -EINVAL;
+
+ return 0;
+}
+
static void ipip6_netlink_parms(struct nlattr *data[],
struct ip_tunnel_parm *parms)
{
@@ -1268,6 +1358,10 @@ static void ipip6_netlink_parms(struct nlattr *data[],
if (data[IFLA_IPTUN_FLAGS])
parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
+
+ if (data[IFLA_IPTUN_PROTO])
+ parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+
}
#ifdef CONFIG_IPV6_SIT_6RD
@@ -1391,6 +1485,8 @@ static size_t ipip6_get_size(const struct net_device *dev)
nla_total_size(1) +
/* IFLA_IPTUN_FLAGS */
nla_total_size(2) +
+ /* IFLA_IPTUN_PROTO */
+ nla_total_size(1) +
#ifdef CONFIG_IPV6_SIT_6RD
/* IFLA_IPTUN_6RD_PREFIX */
nla_total_size(sizeof(struct in6_addr)) +
@@ -1416,6 +1512,7 @@ static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
!!(parm->iph.frag_off & htons(IP_DF))) ||
+ nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
goto nla_put_failure;
@@ -1445,6 +1542,7 @@ static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
[IFLA_IPTUN_TOS] = { .type = NLA_U8 },
[IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
[IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
+ [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
#ifdef CONFIG_IPV6_SIT_6RD
[IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
[IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
@@ -1459,6 +1557,7 @@ static struct rtnl_link_ops sit_link_ops __read_mostly = {
.policy = ipip6_policy,
.priv_size = sizeof(struct ip_tunnel),
.setup = ipip6_tunnel_setup,
+ .validate = ipip6_validate,
.newlink = ipip6_newlink,
.changelink = ipip6_changelink,
.get_size = ipip6_get_size,
@@ -1471,6 +1570,12 @@ static struct xfrm_tunnel sit_handler __read_mostly = {
.priority = 1,
};
+static struct xfrm_tunnel ipip_handler __read_mostly = {
+ .handler = ipip_rcv,
+ .err_handler = ipip6_err,
+ .priority = 2,
+};
+
static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
{
int prio;
@@ -1553,6 +1658,7 @@ static void __exit sit_cleanup(void)
{
rtnl_link_unregister(&sit_link_ops);
xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
+ xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
unregister_pernet_device(&sit_net_ops);
rcu_barrier(); /* Wait for completion of call_rcu()'s */
@@ -1569,9 +1675,14 @@ static int __init sit_init(void)
return err;
err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
if (err < 0) {
- pr_info("%s: can't add protocol\n", __func__);
+ pr_info("%s: can't register ip6ip4\n", __func__);
goto xfrm_tunnel_failed;
}
+ err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
+ if (err < 0) {
+ pr_info("%s: can't register ip4ip4\n", __func__);
+ goto xfrm_tunnel4_failed;
+ }
err = rtnl_link_register(&sit_link_ops);
if (err < 0)
goto rtnl_link_failed;
@@ -1580,6 +1691,8 @@ out:
return err;
rtnl_link_failed:
+ xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
+xfrm_tunnel4_failed:
xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
xfrm_tunnel_failed:
unregister_pernet_device(&sit_net_ops);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 08:56:53 +0100