From: Xin Long <lucien.xin@gmail.com> To: network dev <netdev@vger.kernel.org>, linux-sctp@vger.kernel.org Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>, Neil Horman <nhorman@tuxdriver.com>, Michael Tuexen <tuexen@fh-muenster.de>, davem@davemloft.net, gnault@redhat.com, pabeni@redhat.com, willemdebruijn.kernel@gmail.com Subject: [PATCHv3 net-next 04/16] sctp: create udp4 sock and add its encap_rcv Date: Tue, 13 Oct 2020 07:27:29 +0000 [thread overview] Message-ID: <7159fb58f44f9ff00ca5b3b8a26ee3aa2fd1bf8a.1602574012.git.lucien.xin@gmail.com> (raw) In-Reply-To: <dbad21ff524e119f83ae4444d1ae393ab165fa7c.1602574012.git.lucien.xin@gmail.com> 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. Signed-off-by: Xin Long <lucien.xin@gmail.com> --- include/net/netns/sctp.h | 5 +++++ include/net/sctp/constants.h | 2 ++ include/net/sctp/sctp.h | 2 ++ net/sctp/Kconfig | 1 + net/sctp/protocol.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 53 insertions(+) diff --git a/include/net/netns/sctp.h b/include/net/netns/sctp.h index d8d02e4..3d10bef 100644 --- a/include/net/netns/sctp.h +++ b/include/net/netns/sctp.h @@ -22,6 +22,11 @@ struct netns_sctp { */ struct sock *ctl_sock; + /* udp tunneling listening sock. */ + struct sock *udp4_sock; + /* udp tunneling listening port. */ + int udp_port; + /* This is the global local address list. * We actively maintain this complete list of addresses on * the system by catching address add/delete events. diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h index 122d9e2..b583166 100644 --- a/include/net/sctp/constants.h +++ b/include/net/sctp/constants.h @@ -286,6 +286,8 @@ enum { SCTP_MAX_GABS = 16 }; * functions simpler to write. */ +#define SCTP_DEFAULT_UDP_PORT 9899 /* default udp tunneling port */ + /* These are the values for pf exposure, UNUSED is to keep compatible with old * applications by default. */ diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h index 4fc747b..bfd87a0 100644 --- a/include/net/sctp/sctp.h +++ b/include/net/sctp/sctp.h @@ -84,6 +84,8 @@ int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *addr, struct sctp_pf *sctp_get_pf_specific(sa_family_t family); int sctp_register_pf(struct sctp_pf *, sa_family_t); void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); +int sctp_udp_sock_start(struct net *net); +void sctp_udp_sock_stop(struct net *net); /* * sctp/socket.c diff --git a/net/sctp/Kconfig b/net/sctp/Kconfig index 39d7fa9..5da599f 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 2583323..2b7a3e1 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 default value */ + net->sctp.udp_port = SCTP_DEFAULT_UDP_PORT; + /* Set SCOPE policy to enabled */ net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; -- 2.1.0
WARNING: multiple messages have this Message-ID (diff)
From: Xin Long <lucien.xin@gmail.com> To: network dev <netdev@vger.kernel.org>, linux-sctp@vger.kernel.org Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>, Neil Horman <nhorman@tuxdriver.com>, Michael Tuexen <tuexen@fh-muenster.de>, davem@davemloft.net, gnault@redhat.com, pabeni@redhat.com, willemdebruijn.kernel@gmail.com Subject: [PATCHv3 net-next 04/16] sctp: create udp4 sock and add its encap_rcv Date: Tue, 13 Oct 2020 15:27:29 +0800 [thread overview] Message-ID: <7159fb58f44f9ff00ca5b3b8a26ee3aa2fd1bf8a.1602574012.git.lucien.xin@gmail.com> (raw) Message-ID: <20201013072729.pMEh7UT5KgRr9HFWkjwunZlqzWhwfmD3AIUHlQA4Fek@z> (raw) In-Reply-To: <dbad21ff524e119f83ae4444d1ae393ab165fa7c.1602574012.git.lucien.xin@gmail.com> In-Reply-To: <cover.1602574012.git.lucien.xin@gmail.com> 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. Signed-off-by: Xin Long <lucien.xin@gmail.com> --- include/net/netns/sctp.h | 5 +++++ include/net/sctp/constants.h | 2 ++ include/net/sctp/sctp.h | 2 ++ net/sctp/Kconfig | 1 + net/sctp/protocol.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 53 insertions(+) diff --git a/include/net/netns/sctp.h b/include/net/netns/sctp.h index d8d02e4..3d10bef 100644 --- a/include/net/netns/sctp.h +++ b/include/net/netns/sctp.h @@ -22,6 +22,11 @@ struct netns_sctp { */ struct sock *ctl_sock; + /* udp tunneling listening sock. */ + struct sock *udp4_sock; + /* udp tunneling listening port. */ + int udp_port; + /* This is the global local address list. * We actively maintain this complete list of addresses on * the system by catching address add/delete events. diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h index 122d9e2..b583166 100644 --- a/include/net/sctp/constants.h +++ b/include/net/sctp/constants.h @@ -286,6 +286,8 @@ enum { SCTP_MAX_GABS = 16 }; * functions simpler to write. */ +#define SCTP_DEFAULT_UDP_PORT 9899 /* default udp tunneling port */ + /* These are the values for pf exposure, UNUSED is to keep compatible with old * applications by default. */ diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h index 4fc747b..bfd87a0 100644 --- a/include/net/sctp/sctp.h +++ b/include/net/sctp/sctp.h @@ -84,6 +84,8 @@ int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *addr, struct sctp_pf *sctp_get_pf_specific(sa_family_t family); int sctp_register_pf(struct sctp_pf *, sa_family_t); void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); +int sctp_udp_sock_start(struct net *net); +void sctp_udp_sock_stop(struct net *net); /* * sctp/socket.c diff --git a/net/sctp/Kconfig b/net/sctp/Kconfig index 39d7fa9..5da599f 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 2583323..2b7a3e1 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 default value */ + net->sctp.udp_port = SCTP_DEFAULT_UDP_PORT; + /* Set SCOPE policy to enabled */ net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; -- 2.1.0
next prev parent reply other threads:[~2020-10-13 7:27 UTC|newest] Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-13 7:27 [PATCHv3 net-next 00/16] sctp: Implement RFC6951: UDP Encapsulation of SCTP Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 01/16] udp: check udp sock encap_type in __udp_lib_err Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 02/16] udp6: move the mss check after udp gso tunnel processing Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 03/16] udp: support sctp over udp in skb_udp_tunnel_segment Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` Xin Long [this message] 2020-10-13 7:27 ` [PATCHv3 net-next 04/16] sctp: create udp4 sock and add its encap_rcv Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 05/16] sctp: create udp6 sock and set " Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 06/16] sctp: add encap_err_lookup for udp encap socks Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 07/16] sctp: add encap_port for netns sock asoc and transport Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 08/16] sctp: add SCTP_REMOTE_UDP_ENCAPS_PORT sockopt Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 09/16] sctp: allow changing transport encap_port by peer packets Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 10/16] sctp: add udphdr to overhead when udp_port is set Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 11/16] sctp: call sk_setup_caps in sctp_packet_transmit instead Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 12/16] sctp: support for sending packet over udp4 sock Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 13/16] sctp: support for sending packet over udp6 sock Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 14/16] sctp: add the error cause for new encapsulation port restart Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 15/16] sctp: handle the init chunk matching an existing asoc Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-13 7:27 ` [PATCHv3 net-next 16/16] sctp: enable udp tunneling socks Xin Long 2020-10-13 7:27 ` Xin Long 2020-10-15 17:42 ` Marcelo Ricardo Leitner 2020-10-15 17:42 ` Marcelo Ricardo Leitner 2020-10-15 21:23 ` David Laight 2020-10-15 21:35 ` Michael Tuexen 2020-10-15 21:35 ` Michael Tuexen 2020-10-16 7:08 ` Xin Long 2020-10-16 7:08 ` Xin Long 2020-10-19 10:40 ` Xin Long 2020-10-19 10:40 ` Xin Long 2020-10-13 17:19 ` [PATCHv3 net-next 02/16] udp6: move the mss check after udp gso tunnel processing Willem de Bruijn 2020-10-13 17:19 ` Willem de Bruijn 2020-10-15 3:34 ` [PATCHv3 net-next 00/16] sctp: Implement RFC6951: UDP Encapsulation of SCTP Jakub Kicinski 2020-10-15 3:34 ` Jakub Kicinski 2020-10-15 12:41 ` Marcelo Ricardo Leitner 2020-10-15 12:41 ` Marcelo Ricardo Leitner
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=7159fb58f44f9ff00ca5b3b8a26ee3aa2fd1bf8a.1602574012.git.lucien.xin@gmail.com \ --to=lucien.xin@gmail.com \ --cc=davem@davemloft.net \ --cc=gnault@redhat.com \ --cc=linux-sctp@vger.kernel.org \ --cc=marcelo.leitner@gmail.com \ --cc=netdev@vger.kernel.org \ --cc=nhorman@tuxdriver.com \ --cc=pabeni@redhat.com \ --cc=tuexen@fh-muenster.de \ --cc=willemdebruijn.kernel@gmail.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).