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The Stateless TCP Tunnel (STT) protocol encapsulates traffic in IPv4/TCP packets. STT uses TCP segmentation offload available in most of NIC. On packet xmit STT driver appends STT header along with TCP header to the packet. For GSO packet GSO parameters are set according to tunnel configuration and packet is handed over to networking stack. This allows use of segmentation offload available in NICs The protocol is documented at http://www.ietf.org/archive/id/draft-davie-stt-06.txt Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: Jesse Gross <jesse@nicira.com> Acked-by: Jesse Gross <jesse@nicira.com>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
#ifndef __NET_STT_H
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#define __NET_STT_H 1
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#include <linux/kconfig.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) && IS_ENABLED(CONFIG_NETFILTER)
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#include <net/ip_tunnels.h>
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#define OVS_STT
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struct stthdr {
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__u8 version;
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__u8 flags;
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__u8 l4_offset;
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__u8 reserved;
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__be16 mss;
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__be16 vlan_tci;
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__be64 key;
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};
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/* Padding after the end of the tunnel headers to provide alignment
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* for inner packet IP header after 14 byte Ethernet header.
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*/
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#define STT_ETH_PAD 2
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#define STT_BASE_HLEN (sizeof(struct stthdr) + STT_ETH_PAD)
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#define STT_HEADER_LEN (sizeof(struct tcphdr) + STT_BASE_HLEN)
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static inline struct stthdr *stt_hdr(const struct sk_buff *skb)
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{
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return (struct stthdr *)(skb_transport_header(skb) +
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sizeof(struct tcphdr));
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}
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struct stt_sock;
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typedef void (stt_rcv_t)(struct stt_sock *stt_sock, struct sk_buff *skb);
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/* @list: Per-net list of STT ports.
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* @rcv: The callback is called on STT packet recv, STT reassembly can generate
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* multiple packets, in this case first packet has tunnel outer header, rest
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* of the packets are inner packet segments with no stt header.
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* @rcv_data: user data.
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* @sock: Fake TCP socket for the STT port.
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*/
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struct stt_sock {
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struct list_head list;
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stt_rcv_t *rcv;
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void *rcv_data;
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struct socket *sock;
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struct rcu_head rcu;
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};
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#define stt_sock_add rpl_stt_sock_add
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struct stt_sock *rpl_stt_sock_add(struct net *net, __be16 port,
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stt_rcv_t *rcv, void *data);
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#define stt_sock_release rpl_stt_sock_release
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void rpl_stt_sock_release(struct stt_sock *stt_sock);
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#define stt_xmit_skb rpl_stt_xmit_skb
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int rpl_stt_xmit_skb(struct sk_buff *skb, struct rtable *rt,
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__be32 src, __be32 dst, __u8 tos,
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__u8 ttl, __be16 df, __be16 src_port, __be16 dst_port,
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__be64 tun_id);
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#define stt_init_module ovs_stt_init_module
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int ovs_stt_init_module(void);
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#define stt_cleanup_module ovs_stt_cleanup_module
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void ovs_stt_cleanup_module(void);
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#endif
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#endif /*ifdef__NET_STT_H */
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