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authorXin Long <lucien.xin@gmail.com>2020-10-29 15:04:58 +0800
committerJakub Kicinski <kuba@kernel.org>2020-10-30 15:23:52 -0700
commit965ae44412f8c0c19945b3f62bc945ad0b15a8aa (patch)
treedb151fd8b905d87d9b15a845a17339736881d2e6 /net/sctp
parent527beb8ef9c02c11f8ca0d59fc46f7d081db1c33 (diff)
sctp: create udp4 sock and add its encap_rcv
This patch is to add the functions to create/release udp4 sock, and set the sock's encap_rcv to process the incoming udp encap sctp packets. In sctp_udp_rcv(), as we can see, all we need to do is fix the transport header for sctp_rcv(), then it would implement the part of rfc6951#section-5.4: "When an encapsulated packet is received, the UDP header is removed. Then, the generic lookup is performed, as done by an SCTP stack whenever a packet is received, to find the association for the received SCTP packet" Note that these functions will be called in the last patch of this patchset when enabling this feature. v1->v2: - Add pr_err() when fails to create udp v4 sock. v2->v3: - Add 'select NET_UDP_TUNNEL' in sctp Kconfig. v3->v4: - No change. v4->v5: - Change to set udp_port to 0 by default. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/Kconfig1
-rw-r--r--net/sctp/protocol.c43
2 files changed, 44 insertions, 0 deletions
diff --git a/net/sctp/Kconfig b/net/sctp/Kconfig
index 39d7fa9569f8..5da599ff84a9 100644
--- a/net/sctp/Kconfig
+++ b/net/sctp/Kconfig
@@ -11,6 +11,7 @@ menuconfig IP_SCTP
select CRYPTO_HMAC
select CRYPTO_SHA1
select LIBCRC32C
+ select NET_UDP_TUNNEL
help
Stream Control Transmission Protocol
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 25833238fe93..0f7933422d8e 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -44,6 +44,7 @@
#include <net/addrconf.h>
#include <net/inet_common.h>
#include <net/inet_ecn.h>
+#include <net/udp_tunnel.h>
#define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
@@ -840,6 +841,45 @@ static int sctp_ctl_sock_init(struct net *net)
return 0;
}
+static int sctp_udp_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ skb_set_transport_header(skb, sizeof(struct udphdr));
+ sctp_rcv(skb);
+ return 0;
+}
+
+int sctp_udp_sock_start(struct net *net)
+{
+ struct udp_tunnel_sock_cfg tuncfg = {NULL};
+ struct udp_port_cfg udp_conf = {0};
+ struct socket *sock;
+ int err;
+
+ udp_conf.family = AF_INET;
+ udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
+ udp_conf.local_udp_port = htons(net->sctp.udp_port);
+ err = udp_sock_create(net, &udp_conf, &sock);
+ if (err) {
+ pr_err("Failed to create the SCTP UDP tunneling v4 sock\n");
+ return err;
+ }
+
+ tuncfg.encap_type = 1;
+ tuncfg.encap_rcv = sctp_udp_rcv;
+ setup_udp_tunnel_sock(net, sock, &tuncfg);
+ net->sctp.udp4_sock = sock->sk;
+
+ return 0;
+}
+
+void sctp_udp_sock_stop(struct net *net)
+{
+ if (net->sctp.udp4_sock) {
+ udp_tunnel_sock_release(net->sctp.udp4_sock->sk_socket);
+ net->sctp.udp4_sock = NULL;
+ }
+}
+
/* Register address family specific functions. */
int sctp_register_af(struct sctp_af *af)
{
@@ -1271,6 +1311,9 @@ static int __net_init sctp_defaults_init(struct net *net)
/* Enable ECN by default. */
net->sctp.ecn_enable = 1;
+ /* Set UDP tunneling listening port to 0 by default */
+ net->sctp.udp_port = 0;
+
/* Set SCOPE policy to enabled */
net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;