From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- include/net/lwtunnel.h | 269 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 269 insertions(+) create mode 100644 include/net/lwtunnel.h (limited to 'include/net/lwtunnel.h') diff --git a/include/net/lwtunnel.h b/include/net/lwtunnel.h new file mode 100644 index 000000000..53bd2d02a --- /dev/null +++ b/include/net/lwtunnel.h @@ -0,0 +1,269 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __NET_LWTUNNEL_H +#define __NET_LWTUNNEL_H 1 + +#include +#include +#include +#include +#include + +#define LWTUNNEL_HASH_BITS 7 +#define LWTUNNEL_HASH_SIZE (1 << LWTUNNEL_HASH_BITS) + +/* lw tunnel state flags */ +#define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0) +#define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1) +#define LWTUNNEL_STATE_XMIT_REDIRECT BIT(2) + +/* LWTUNNEL_XMIT_CONTINUE should be distinguishable from dst_output return + * values (NET_XMIT_xxx and NETDEV_TX_xxx in linux/netdevice.h) for safety. + */ +enum { + LWTUNNEL_XMIT_DONE, + LWTUNNEL_XMIT_CONTINUE = 0x100, +}; + + +struct lwtunnel_state { + __u16 type; + __u16 flags; + __u16 headroom; + atomic_t refcnt; + int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb); + int (*orig_input)(struct sk_buff *); + struct rcu_head rcu; + __u8 data[]; +}; + +struct lwtunnel_encap_ops { + int (*build_state)(struct net *net, struct nlattr *encap, + unsigned int family, const void *cfg, + struct lwtunnel_state **ts, + struct netlink_ext_ack *extack); + void (*destroy_state)(struct lwtunnel_state *lws); + int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); + int (*input)(struct sk_buff *skb); + int (*fill_encap)(struct sk_buff *skb, + struct lwtunnel_state *lwtstate); + int (*get_encap_size)(struct lwtunnel_state *lwtstate); + int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b); + int (*xmit)(struct sk_buff *skb); + + struct module *owner; +}; + +#ifdef CONFIG_LWTUNNEL + +DECLARE_STATIC_KEY_FALSE(nf_hooks_lwtunnel_enabled); + +void lwtstate_free(struct lwtunnel_state *lws); + +static inline struct lwtunnel_state * +lwtstate_get(struct lwtunnel_state *lws) +{ + if (lws) + atomic_inc(&lws->refcnt); + + return lws; +} + +static inline void lwtstate_put(struct lwtunnel_state *lws) +{ + if (!lws) + return; + + if (atomic_dec_and_test(&lws->refcnt)) + lwtstate_free(lws); +} + +static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) +{ + if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT)) + return true; + + return false; +} + +static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) +{ + if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT)) + return true; + + return false; +} + +static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate) +{ + if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT)) + return true; + + return false; +} + +static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate, + unsigned int mtu) +{ + if ((lwtunnel_xmit_redirect(lwtstate) || + lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu) + return lwtstate->headroom; + + return 0; +} + +int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, + unsigned int num); +int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, + unsigned int num); +int lwtunnel_valid_encap_type(u16 encap_type, + struct netlink_ext_ack *extack); +int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len, + struct netlink_ext_ack *extack); +int lwtunnel_build_state(struct net *net, u16 encap_type, + struct nlattr *encap, + unsigned int family, const void *cfg, + struct lwtunnel_state **lws, + struct netlink_ext_ack *extack); +int lwtunnel_fill_encap(struct sk_buff *skb, struct lwtunnel_state *lwtstate, + int encap_attr, int encap_type_attr); +int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate); +struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len); +int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b); +int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb); +int lwtunnel_input(struct sk_buff *skb); +int lwtunnel_xmit(struct sk_buff *skb); +int bpf_lwt_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, + bool ingress); + +static inline void lwtunnel_set_redirect(struct dst_entry *dst) +{ + if (lwtunnel_output_redirect(dst->lwtstate)) { + dst->lwtstate->orig_output = dst->output; + dst->output = lwtunnel_output; + } + if (lwtunnel_input_redirect(dst->lwtstate)) { + dst->lwtstate->orig_input = dst->input; + dst->input = lwtunnel_input; + } +} +#else + +static inline void lwtstate_free(struct lwtunnel_state *lws) +{ +} + +static inline struct lwtunnel_state * +lwtstate_get(struct lwtunnel_state *lws) +{ + return lws; +} + +static inline void lwtstate_put(struct lwtunnel_state *lws) +{ +} + +static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) +{ + return false; +} + +static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) +{ + return false; +} + +static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate) +{ + return false; +} + +static inline void lwtunnel_set_redirect(struct dst_entry *dst) +{ +} + +static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate, + unsigned int mtu) +{ + return 0; +} + +static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, + unsigned int num) +{ + return -EOPNOTSUPP; + +} + +static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, + unsigned int num) +{ + return -EOPNOTSUPP; +} + +static inline int lwtunnel_valid_encap_type(u16 encap_type, + struct netlink_ext_ack *extack) +{ + NL_SET_ERR_MSG(extack, "CONFIG_LWTUNNEL is not enabled in this kernel"); + return -EOPNOTSUPP; +} +static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len, + struct netlink_ext_ack *extack) +{ + /* return 0 since we are not walking attr looking for + * RTA_ENCAP_TYPE attribute on nexthops. + */ + return 0; +} + +static inline int lwtunnel_build_state(struct net *net, u16 encap_type, + struct nlattr *encap, + unsigned int family, const void *cfg, + struct lwtunnel_state **lws, + struct netlink_ext_ack *extack) +{ + return -EOPNOTSUPP; +} + +static inline int lwtunnel_fill_encap(struct sk_buff *skb, + struct lwtunnel_state *lwtstate, + int encap_attr, int encap_type_attr) +{ + return 0; +} + +static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate) +{ + return 0; +} + +static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len) +{ + return NULL; +} + +static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a, + struct lwtunnel_state *b) +{ + return 0; +} + +static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb) +{ + return -EOPNOTSUPP; +} + +static inline int lwtunnel_input(struct sk_buff *skb) +{ + return -EOPNOTSUPP; +} + +static inline int lwtunnel_xmit(struct sk_buff *skb) +{ + return -EOPNOTSUPP; +} + +#endif /* CONFIG_LWTUNNEL */ + +#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type)) + +#endif /* __NET_LWTUNNEL_H */ -- cgit v1.2.3