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authorBen Hutchings <ben@decadent.org.uk>2014-10-30 18:27:17 +0000
committerDavid S. Miller <davem@davemloft.net>2014-10-30 20:01:18 -0400
commit5188cd44c55db3e92cd9e77a40b5baa7ed4340f7 (patch)
treed4f4a4497056c8bbf9dd7435356e45f9bcbf9796
parent3d0ad09412ffe00c9afa201d01effdb6023d09b4 (diff)
drivers/net, ipv6: Select IPv6 fragment idents for virtio UFO packets
UFO is now disabled on all drivers that work with virtio net headers, but userland may try to send UFO/IPv6 packets anyway. Instead of sending with ID=0, we should select identifiers on their behalf (as we used to). Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Fixes: 916e4cf46d02 ("ipv6: reuse ip6_frag_id from ip6_ufo_append_data") Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/macvtap.c3
-rw-r--r--drivers/net/tun.c6
-rw-r--r--include/net/ipv6.h2
-rw-r--r--net/ipv6/output_core.c34
4 files changed, 44 insertions, 1 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 2aeaa61ece09..6f226de655a4 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -16,6 +16,7 @@
#include <linux/idr.h>
#include <linux/fs.h>
+#include <net/ipv6.h>
#include <net/net_namespace.h>
#include <net/rtnetlink.h>
#include <net/sock.h>
@@ -572,6 +573,8 @@ static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb,
pr_warn_once("macvtap: %s: using disabled UFO feature; please fix this program\n",
current->comm);
gso_type = SKB_GSO_UDP;
+ if (skb->protocol == htons(ETH_P_IPV6))
+ ipv6_proxy_select_ident(skb);
break;
default:
return -EINVAL;
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 280d3d2a9792..7302398f0b1f 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -65,6 +65,7 @@
#include <linux/nsproxy.h>
#include <linux/virtio_net.h>
#include <linux/rcupdate.h>
+#include <net/ipv6.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
@@ -1139,6 +1140,8 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
break;
}
+ skb_reset_network_header(skb);
+
if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
pr_debug("GSO!\n");
switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
@@ -1159,6 +1162,8 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
current->comm);
}
skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
+ if (skb->protocol == htons(ETH_P_IPV6))
+ ipv6_proxy_select_ident(skb);
break;
}
default:
@@ -1189,7 +1194,6 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
}
- skb_reset_network_header(skb);
skb_probe_transport_header(skb, 0);
rxhash = skb_get_hash(skb);
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 97f472012438..4292929392b0 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -671,6 +671,8 @@ static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_add
return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
}
+void ipv6_proxy_select_ident(struct sk_buff *skb);
+
int ip6_dst_hoplimit(struct dst_entry *dst);
static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index fc24c390af05..97f41a3e68d9 100644
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -3,11 +3,45 @@
* not configured or static. These functions are needed by GSO/GRO implementation.
*/
#include <linux/export.h>
+#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ip6_fib.h>
#include <net/addrconf.h>
#include <net/secure_seq.h>
+/* This function exists only for tap drivers that must support broken
+ * clients requesting UFO without specifying an IPv6 fragment ID.
+ *
+ * This is similar to ipv6_select_ident() but we use an independent hash
+ * seed to limit information leakage.
+ *
+ * The network header must be set before calling this.
+ */
+void ipv6_proxy_select_ident(struct sk_buff *skb)
+{
+ static u32 ip6_proxy_idents_hashrnd __read_mostly;
+ struct in6_addr buf[2];
+ struct in6_addr *addrs;
+ u32 hash, id;
+
+ addrs = skb_header_pointer(skb,
+ skb_network_offset(skb) +
+ offsetof(struct ipv6hdr, saddr),
+ sizeof(buf), buf);
+ if (!addrs)
+ return;
+
+ net_get_random_once(&ip6_proxy_idents_hashrnd,
+ sizeof(ip6_proxy_idents_hashrnd));
+
+ hash = __ipv6_addr_jhash(&addrs[1], ip6_proxy_idents_hashrnd);
+ hash = __ipv6_addr_jhash(&addrs[0], hash);
+
+ id = ip_idents_reserve(hash, 1);
+ skb_shinfo(skb)->ip6_frag_id = htonl(id);
+}
+EXPORT_SYMBOL_GPL(ipv6_proxy_select_ident);
+
int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
{
u16 offset = sizeof(struct ipv6hdr);