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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:35:05 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:39:31 +0000
commit85c675d0d09a45a135bddd15d7b385f8758c32fb (patch)
tree76267dbc9b9a130337be3640948fe397b04ac629 /net/ipv6/ip6_udp_tunnel.c
parentAdding upstream version 6.6.15. (diff)
downloadlinux-85c675d0d09a45a135bddd15d7b385f8758c32fb.tar.xz
linux-85c675d0d09a45a135bddd15d7b385f8758c32fb.zip
Adding upstream version 6.7.7.upstream/6.7.7
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/ipv6/ip6_udp_tunnel.c')
-rw-r--r--net/ipv6/ip6_udp_tunnel.c75
1 files changed, 73 insertions, 2 deletions
diff --git a/net/ipv6/ip6_udp_tunnel.c b/net/ipv6/ip6_udp_tunnel.c
index cdc4d4ee24..a7bf0327b3 100644
--- a/net/ipv6/ip6_udp_tunnel.c
+++ b/net/ipv6/ip6_udp_tunnel.c
@@ -1,3 +1,4 @@
+
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/module.h>
#include <linux/errno.h>
@@ -75,8 +76,9 @@ EXPORT_SYMBOL_GPL(udp_sock_create6);
int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb,
- struct net_device *dev, struct in6_addr *saddr,
- struct in6_addr *daddr,
+ struct net_device *dev,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
__u8 prio, __u8 ttl, __be32 label,
__be16 src_port, __be16 dst_port, bool nocheck)
{
@@ -111,4 +113,73 @@ int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
}
EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
+/**
+ * udp_tunnel6_dst_lookup - perform route lookup on UDP tunnel
+ * @skb: Packet for which lookup is done
+ * @dev: Tunnel device
+ * @net: Network namespace of tunnel device
+ * @sock: Socket which provides route info
+ * @oif: Index of the output interface
+ * @saddr: Memory to store the src ip address
+ * @key: Tunnel information
+ * @sport: UDP source port
+ * @dport: UDP destination port
+ * @dsfield: The traffic class field
+ * @dst_cache: The dst cache to use for lookup
+ * This function performs a route lookup on a UDP tunnel
+ *
+ * It returns a valid dst pointer and stores src address to be used in
+ * tunnel in param saddr on success, else a pointer encoded error code.
+ */
+
+struct dst_entry *udp_tunnel6_dst_lookup(struct sk_buff *skb,
+ struct net_device *dev,
+ struct net *net,
+ struct socket *sock,
+ int oif,
+ struct in6_addr *saddr,
+ const struct ip_tunnel_key *key,
+ __be16 sport, __be16 dport, u8 dsfield,
+ struct dst_cache *dst_cache)
+{
+ struct dst_entry *dst = NULL;
+ struct flowi6 fl6;
+
+#ifdef CONFIG_DST_CACHE
+ if (dst_cache) {
+ dst = dst_cache_get_ip6(dst_cache, saddr);
+ if (dst)
+ return dst;
+ }
+#endif
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_mark = skb->mark;
+ fl6.flowi6_proto = IPPROTO_UDP;
+ fl6.flowi6_oif = oif;
+ fl6.daddr = key->u.ipv6.dst;
+ fl6.saddr = key->u.ipv6.src;
+ fl6.fl6_sport = sport;
+ fl6.fl6_dport = dport;
+ fl6.flowlabel = ip6_make_flowinfo(dsfield, key->label);
+
+ dst = ipv6_stub->ipv6_dst_lookup_flow(net, sock->sk, &fl6,
+ NULL);
+ if (IS_ERR(dst)) {
+ netdev_dbg(dev, "no route to %pI6\n", &fl6.daddr);
+ return ERR_PTR(-ENETUNREACH);
+ }
+ if (dst->dev == dev) { /* is this necessary? */
+ netdev_dbg(dev, "circular route to %pI6\n", &fl6.daddr);
+ dst_release(dst);
+ return ERR_PTR(-ELOOP);
+ }
+#ifdef CONFIG_DST_CACHE
+ if (dst_cache)
+ dst_cache_set_ip6(dst_cache, dst, &fl6.saddr);
+#endif
+ *saddr = fl6.saddr;
+ return dst;
+}
+EXPORT_SYMBOL_GPL(udp_tunnel6_dst_lookup);
+
MODULE_LICENSE("GPL");