/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NET_NF_TABLES_H
#define _NET_NF_TABLES_H
#include <linux/unaligned.h>
#include <linux/list.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/nf_tables.h>
#include <linux/u64_stats_sync.h>
#include <linux/rhashtable.h>
#include <net/netfilter/nf_flow_table.h>
#include <net/netlink.h>
#include <net/flow_offload.h>
#include <net/netns/generic.h>
#define NFT_MAX_HOOKS (NF_INET_INGRESS + 1)
struct module;
#define NFT_JUMP_STACK_SIZE 16
enum {
NFT_PKTINFO_L4PROTO = (1 << 0),
NFT_PKTINFO_INNER = (1 << 1),
NFT_PKTINFO_INNER_FULL = (1 << 2),
};
struct nft_pktinfo {
struct sk_buff *skb;
const struct nf_hook_state *state;
u8 flags;
u8 tprot;
u16 fragoff;
u16 thoff;
u16 inneroff;
};
static inline struct sock *nft_sk(const struct nft_pktinfo *pkt)
{
return pkt->state->sk;
}
static inline unsigned int nft_thoff(const struct nft_pktinfo *pkt)
{
return pkt->thoff;
}
static inline struct net *nft_net(const struct nft_pktinfo *pkt)
{
return pkt->state->net;
}
static inline unsigned int nft_hook(const struct nft_pktinfo *pkt)
{
return pkt->state->hook;
}
static inline u8 nft_pf(const struct nft_pktinfo *pkt)
{
return pkt->state->pf;
}
static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt)
{
return pkt->state->in;
}
static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt)
{
return pkt->state->out;
}
static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
pkt->skb = skb;
pkt->state = state;
}
static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt)
{
pkt->flags = 0;
pkt->tprot = 0;
pkt->thoff = 0;
pkt->fragoff = 0;
}
/**
* struct nft_verdict - nf_tables verdict
*
* @code: nf_tables/netfilter verdict code
* @chain: destination chain for NFT_JUMP/NFT_GOTO
*/
struct nft_verdict {
u32 code;
struct nft_chain *chain;
};
struct nft_data {
union {
u32 data[4];
struct nft_verdict verdict;
};
} __attribute__((aligned(__alignof__(u64))));
#define NFT_REG32_NUM 20
/**
* struct nft_regs - nf_tables register set
*
* @data: data registers
* @verdict: verdict register
*
* The first four data registers alias to the verdict register.
*/
struct nft_regs {
union {
u32 data[NFT_REG32_NUM];
struct nft_verdict verdict;
};
};
struct nft_regs_track {
struct {
const struct nft_expr *selector;
const struct nft_expr *bitwise;
u8 num_reg;
} regs[NFT_REG32_NUM];
const struct nft_expr *cur;
const struct nft_expr *last;
};
/* Store/load an u8, u16 or u64 integer to/from the u32 data register.
*
* Note, when using concatenations, register allocation happens at 32-bit
* level. So for store instruction, pad the rest part with zero to avoid
* garbage values.
*/
static inline void nft_reg_store8(u32 *dreg, u8 val)
{
*dreg = 0;
*(u8 *)dreg = val;
}
static inline u8 nft_reg_load8(const u32 *sreg)
{
return *(u8 *)sreg;
}
static inline void nft_reg_store16(u32 *dreg, u16 val)
{
*dreg = 0;
*(u16 *)dreg = val;
}
static inline void nft_reg_store_be16(u32 *dreg, __be16 val)
{
nft_reg_store16(dreg, (__force __u16)val);
}
static inline u16 nft_reg_load16(const u32 *sreg)
{
return *(u16 *)sreg;
}
static inline __be16 nft_reg_load_be16(const u32 *sreg)
{
return (__force __be16)nft_reg_load16(sreg);
}
static inline __be32 nft_reg_load_be32(const u32 *sreg)
{
return *(__force __be32 *)sreg;
}
static inline void nft_reg_store64(u64 *dreg, u64 val)
{
put_unaligned(val, dreg);
}
static inline u64 nft_reg_load64(const u32 *sreg)
{
return get_unaligned((u64 *)sreg);
}
static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
unsigned int len)
{
if (len % NFT_REG32_SIZE)
dst[len / NFT_REG32_SIZE] = 0;
memcpy(dst, src, len);
}
/**
* struct nft_ctx - nf_tables rule/set context
*
* @net: net namespace
* @table: the table the chain is contained in
* @chain: the chain the rule is contained in
* @nla: netlink attributes
* @portid: netlink portID of the original message
* @seq: netlink sequence number
* @flags: modifiers to new request
* @family: protocol family
* @level: depth of the chains
* @report: notify via unicast netlink message
* @reg_inited: bitmap of initialised registers
*/
struct nft_ctx {
struct net *net;
struct nft_table *table;
struct nft_chain *chain;
const struct nlattr * const *nla;
u32 portid;
u32 seq;
u16 flags;
u8 family;
u8 level;
bool report;
DECLARE_BITMAP(reg_inited, NFT_REG32_NUM);
};
enum nft_data_desc_flags {
NFT_DATA_DESC_SETELEM = (1 << 0),
};
struct nft_data_desc {
enum nft_data_types type;
unsigned int size;
unsigned int len;
unsigned int flags;
};
int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
struct nft_data_desc *desc, const struct nlattr *nla);
void nft_data_hold(const struct nft_data *data, enum nft_data_types type);
void nft_data_release(const struct nft_data *data, enum nft_data_types type);
int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
enum nft_data_types type, unsigned int len);
static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
{
return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
}
static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
{
return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
}
int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
int nft_parse_register_load(const struct nft_ctx *ctx,
const struct nlattr *attr, u8 *sreg, u32 len);
int nft_parse_register_store(const struct nft_ctx *ctx,
const struct nlattr *attr, u8 *dreg,
const struct nft_data *data,
enum nft_data_types type, unsigned int len);
/**
* struct nft_userdata - user defined data associated with an object
*
* @len: length of the data
* @data: content
*
* The presence of user data is indicated in an object specific fashion,
* so a length of zero can't occur and the value "len" indicates data
* of length len + 1.
*/
struct nft_userdata {
u8 len;
unsigned char data[];
};
/* placeholder structure for opaque set element backend representation. */
struct nft_elem_priv { };
/**
* struct nft_set_elem - generic representation of set elements
*
* @key: element key
* @key_end: closing element key
* @data: element data
* @priv: element private data and extensions
*/
struct nft_set_elem {
union {
u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
struct nft_data val;
} key;
union {
u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
struct nft_data val;
} key_end;
union {
u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
struct nft_data val;
} data;
struct nft_elem_priv *priv;
};
static inline void *nft_elem_priv_cast(const struct nft_elem_priv *priv)
{
return (void *)priv;
}
/**
* enum nft_iter_type - nftables set iterator type
*
* @NFT_ITER_UNSPEC: unspecified, to catch errors
* @NFT_ITER_READ: read-only iteration over set elements
* @NFT_ITER_UPDATE: iteration under mutex to update set element state
*/
enum nft_iter_type {
NFT_ITER_UNSPEC,
NFT_ITER_READ,
NFT_ITER_UPDATE,
};
struct nft_set;
struct nft_set_iter {
u8 genmask;
enum nft_iter_type type:8;
unsigned int count;
unsigned int skip;
int err;
int (*fn)(const struct nft_ctx *ctx,
struct nft_set *set,
const struct nft_set_iter *iter,
struct nft_elem_priv *elem_priv);
};
/**
* struct nft_set_desc - description of set elements
*
* @ktype: key type
* @klen: key length
* @dtype: data type
* @dlen: data length
* @objtype: object type
* @size: number of set elements
* @policy: set policy
* @gc_int: garbage collector interval
* @timeout: element timeout
* @field_len: length of each field in concatenation, bytes
* @field_count: number of concatenated fields in element
* @expr: set must support for expressions
*/
struct nft_set_desc {
u32 ktype;
unsigned int klen;
u32 dtype;
unsigned int dlen;
u32 objtype;
unsigned int size;
u32 policy;
u32 gc_int;
u64 timeout;
u8 field_len[NFT_REG32_COUNT];
u8 field_count;
bool expr;
};
/**
* enum nft_set_class - performance class
*
* @NFT_SET_CLASS_O_1: constant, O(1)
* @NFT_SET_CLASS_O_LOG_N: logarithmic, O(log N)
* @NFT_SET_CLASS_O_N: linear, O(N)
*/
enum nft_set_class {
NFT_SET_CLASS_O_1,
NFT_SET_CLASS_O_LOG_N,
NFT_SET_CLASS_O_N,
};
/**
* struct nft_set_estimate - estimation of memory and performance
* characteristics
*
* @size: required memory
* @lookup: lookup performance class
* @space: memory class
*/
struct nft_set_estimate {
u64 size;
enum nft_set_class lookup;
enum nft_set_class space;
};
#define NFT_EXPR_MAXATTR 16
#define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
ALIGN(size, __alignof__(struct nft_expr)))
/**
* struct nft_expr - nf_tables expression
*
* @ops: expression ops
* @data: expression private data
*/
struct nft_expr {
const struct nft_expr_ops *ops;
unsigned char data[]
__attribute__((aligned(__alignof__(u64))));
};
static inline void *nft_expr_priv(const struct nft_expr *expr)
{
return (void *)expr->data;
}
struct nft_expr_info;
int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
struct nft_expr_info *info);
int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp);
void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
const struct nft_expr *expr, bool reset);
bool nft_expr_reduce_bitwise(struct nft_regs_track *track,
const struct nft_expr *expr);
struct nft_set_ext;
/**
* struct nft_set_ops - nf_tables set operations
*
* @lookup: look up an element within the set
* @update: update an element if exists, add it if doesn't exist
* @delete: delete an element
* @insert: insert new element into set
* @activate: activate new element in the next generation
* @deactivate: lookup for element and deactivate it in the next generation
* @flush: deactivate element in the next generation
* @remove: remove element from set
* @walk: iterate over all set elements
* @get: get set elements
* @commit: commit set elements
* @abort: abort set elements
* @privsize: function to return size of set private data
* @estimate: estimate the required memory size and the lookup complexity class
* @init: initialize private data of new set instance
* @destroy: destroy private data of set instance
* @gc_init: initialize garbage collection
* @elemsize: element private size
*
* Operations lookup, update and delete have simpler interfaces, are faster
* and currently only used in the packet path. All the rest are slower,
* control plane functions.
*/
struct nft_set_ops {
bool (*lookup)(const struct net *net,
const struct nft_set *set,
const u32 *key,
const struct nft_set_ext **ext);
bool (*update)(struct nft_set *set,
const u32 *key,
struct nft_elem_priv *
(*new)(struct nft_set *,
const struct nft_expr *,
struct nft_regs *),
const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_set_ext **ext);
bool (*delete)(const struct nft_set *set,
const u32 *key);
int (*insert)(const struct net *net,
const struct nft_set *set,
const struct nft_set_elem *elem,
struct nft_elem_priv **priv);
void (*activate)(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *elem_priv);
struct nft_elem_priv * (*deactivate)(const struct net *net,
const struct nft_set *set,
const struct nft_set_elem *elem);
void (*flush)(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *priv);
void (*remove)(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *elem_priv);
void (*walk)(const struct nft_ctx *ctx,
struct nft_set *set,
struct nft_set_iter *iter);
struct nft_elem_priv * (*get)(const struct net *net,
const struct nft_set *set,
const struct nft_set_elem *elem,
unsigned int flags);
void (*commit)(struct nft_set *set);
void (*abort)(const struct nft_set *set);
u64 (*privsize)(const struct nlattr * const nla[],
const struct nft_set_desc *desc);
bool (*estimate)(const struct nft_set_desc *desc,
u32 features,
struct nft_set_estimate *est);
int (*init)(const struct nft_set *set,
const struct nft_set_desc *desc,
const struct nlattr * const nla[]);
void (*destroy)(const struct nft_ctx *ctx,
const struct nft_set *set);
void (*gc_init)(const struct nft_set *set);
unsigned int elemsize;
};
/**
* struct nft_set_type - nf_tables set type
*
* @ops: set ops for this type
* @features: features supported by the implementation
*/
struct nft_set_type {
const struct nft_set_ops ops;
u32 features;
};
#define to_set_type(o) container_of(o, struct nft_set_type, ops)
struct nft_set_elem_expr {
u8 size;
unsigned char data[]
__attribute__((aligned(__alignof__(struct nft_expr))));
};
#define nft_setelem_expr_at(__elem_expr, __offset) \
((struct nft_expr *)&__elem_expr->data[__offset])
#define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \
for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \
__size < (__elem_expr)->size; \
__size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size)
#define NFT_SET_EXPR_MAX 2
/**
* struct nft_set - nf_tables set instance
*
* @list: table set list node
* @bindings: list of set bindings
* @refs: internal refcounting for async set destruction
* @table: table this set belongs to
* @net: netnamespace this set belongs to
* @name: name of the set
* @handle: unique handle of the set
* @ktype: key type (numeric type defined by userspace, not used in the kernel)
* @dtype: data type (verdict or numeric type defined by userspace)
* @objtype: object type (see NFT_OBJECT_* definitions)
* @size: maximum set size
* @field_len: length of each field in concatenation, bytes
* @field_count: number of concatenated fields in element
* @use: number of rules references to this set
* @nelems: number of elements
* @ndeact: number of deactivated elements queued for removal
* @timeout: default timeout value in jiffies
* @gc_int: garbage collection interval in msecs
* @policy: set parameterization (see enum nft_set_policies)
* @udlen: user data length
* @udata: user data
* @pending_update: list of pending update set element
* @ops: set ops
* @flags: set flags
* @dead: set will be freed, never cleared
* @genmask: generation mask
* @klen: key length
* @dlen: data length
* @num_exprs: numbers of exprs
* @exprs: stateful expression
* @catchall_list: list of catch-all set element
* @data: private set data
*/
struct nft_set {
struct list_head list;
struct list_head bindings;
refcount_t refs;
struct nft_table *table;
possible_net_t net;
char *name;
u64 handle;
u32 ktype;
u32 dtype;
u32 objtype;
u32 size;
u8 field_len[NFT_REG32_COUNT];
u8 field_count;
u32 use;
atomic_t nelems;
u32 ndeact;
u64 timeout;
u32 gc_int;
u16 policy;
u16 udlen;
unsigned char *udata;
struct list_head pending_update;
/* runtime data below here */
const struct nft_set_ops *ops ____cacheline_aligned;
u16 flags:13,
dead:1,
genmask:2;
u8 klen;
u8 dlen;
u8 num_exprs;
struct nft_expr *exprs[NFT_SET_EXPR_MAX];
struct list_head catchall_list;
unsigned char data[]
__attribute__((aligned(__alignof__(u64))));
};
static inline bool nft_set_is_anonymous(const struct nft_set *set)
{
return set->flags & NFT_SET_ANONYMOUS;
}
static inline void *nft_set_priv(const struct nft_set *set)
{
return (void *)set->data;
}
static inline enum nft_data_types nft_set_datatype(const struct nft_set *set)
{
return set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
}
static inline bool nft_set_gc_is_pending(const struct nft_set *s)
{
return refcount_read(&s->refs) != 1;
}
static inline struct nft_set *nft_set_container_of(const void *priv)
{
return (void *)priv - offsetof(struct nft_set, data);
}
struct nft_set *nft_set_lookup_global(const struct net *net,
const struct nft_table *table,
const struct nlattr *nla_set_name,
const struct nlattr *nla_set_id,
u8 genmask);
struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
const struct nft_set *set);
static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
{
u32 gc_int = READ_ONCE(set->gc_int);
return gc_int ? msecs_to_jiffies(gc_int) : HZ;
}
/**
* struct nft_set_binding - nf_tables set binding
*
* @list: set bindings list node
* @chain: chain containing the rule bound to the set
* @flags: set action flags
*
* A set binding contains all information necessary for validation
* of new elements added to a bound set.
*/
struct nft_set_binding {
struct list_head list;
const struct nft_chain *chain;
u32 flags;
};
enum nft_trans_phase;
void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set);
void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_set_binding *binding,
enum nft_trans_phase phase);
int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_set_binding *binding);
void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set);
/**
* enum nft_set_extensions - set extension type IDs
*
* @NFT_SET_EXT_KEY: element key
* @NFT_SET_EXT_KEY_END: upper bound element key, for ranges
* @NFT_SET_EXT_DATA: mapping data
* @NFT_SET_EXT_FLAGS: element flags
* @NFT_SET_EXT_TIMEOUT: element timeout
* @NFT_SET_EXT_USERDATA: user data associated with the element
* @NFT_SET_EXT_EXPRESSIONS: expressions associated with the element
* @NFT_SET_EXT_OBJREF: stateful object reference associated with element
* @NFT_SET_EXT_NUM: number of extension types
*/
enum nft_set_extensions {
NFT_SET_EXT_KEY,
NFT_SET_EXT_KEY_END,
NFT_SET_EXT_DATA,
NFT_SET_EXT_FLAGS,
NFT_SET_EXT_TIMEOUT,
NFT_SET_EXT_USERDATA,
NFT_SET_EXT_EXPRESSIONS,
NFT_SET_EXT_OBJREF,
NFT_SET_EXT_NUM
};
/**
* struct nft_set_ext_type - set extension type
*
* @len: fixed part length of the extension
* @align: alignment requirements of the extension
*/
struct nft_set_ext_type {
u8 len;
u8 align;
};
extern const struct nft_set_ext_type nft_set_ext_types[];
/**
* struct nft_set_ext_tmpl - set extension template
*
* @len: length of extension area
* @offset: offsets of individual extension types
* @ext_len: length of the expected extension(used to sanity check)
*/
struct nft_set_ext_tmpl {
u16 len;
u8 offset[NFT_SET_EXT_NUM];
u8 ext_len[NFT_SET_EXT_NUM];
};
/**
* struct nft_set_ext - set extensions
*
* @genmask: generation mask
* @offset: offsets of individual extension types
* @data: beginning of extension data
*/
struct nft_set_ext {
u8 genmask;
u8 offset[NFT_SET_EXT_NUM];
char data[];
};
static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
{
memset(tmpl, 0, sizeof(*tmpl));
tmpl->len = sizeof(struct nft_set_ext);
}
static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
unsigned int len)
{
tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
if (tmpl->len > U8_MAX)
return -EINVAL;
tmpl->offset[id] = tmpl->len;
tmpl->ext_len[id] = nft_set_ext_types[id].len + len;
tmpl->len += tmpl->ext_len[id];
return 0;
}
static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
{
return nft_set_ext_add_length(tmpl, id, 0);
}
static inline void nft_set_ext_init(struct nft_set_ext *ext,
const struct nft_set_ext_tmpl *tmpl)
{
memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
}
static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
{
return !!ext->offset[id];
}
static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
{
return ext && __nft_set_ext_exists(ext, id);
}
static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
{
return (void *)ext + ext->offset[id];
}
static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
{
return nft_set_ext(ext, NFT_SET_EXT_KEY);
}
static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext)
{
return nft_set_ext(ext, NFT_SET_EXT_KEY_END);
}
static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
{
return nft_set_ext(ext, NFT_SET_EXT_DATA);
}
static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
{
return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
}
struct nft_timeout {
u64 timeout;
u64 expiration;
};
static inline struct nft_timeout *nft_set_ext_timeout(const struct nft_set_ext *ext)
{
return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
}
static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
{
return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
}
static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
{
return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS);
}
static inline bool __nft_set_elem_expired(const struct nft_set_ext *ext,
u64 tstamp)
{
if (!nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) ||
READ_ONCE(nft_set_ext_timeout(ext)->timeout) == 0)
return false;
return time_after_eq64(tstamp, READ_ONCE(nft_set_ext_timeout(ext)->expiration));
}
static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
{
return __nft_set_elem_expired(ext, get_jiffies_64());
}
static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
const struct nft_elem_priv *elem_priv)
{
return (void *)elem_priv + set->ops->elemsize;
}
static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
{
return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
}
struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
const struct nft_set *set,
const struct nlattr *attr);
struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
const struct nft_set_ext_tmpl *tmpl,
const u32 *key, const u32 *key_end,
const u32 *data,
u64 timeout, u64 expiration, gfp_t gfp);
int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_expr *expr_array[]);
void nft_set_elem_destroy(const struct nft_set *set,
const struct nft_elem_priv *elem_priv,
bool destroy_expr);
void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
const struct nft_set *set,
const struct nft_elem_priv *elem_priv);
struct nft_expr_ops;
/**
* struct nft_expr_type - nf_tables expression type
*
* @select_ops: function to select nft_expr_ops
* @release_ops: release nft_expr_ops
* @ops: default ops, used when no select_ops functions is present
* @inner_ops: inner ops, used for inner packet operation
* @list: used internally
* @name: Identifier
* @owner: module reference
* @policy: netlink attribute policy
* @maxattr: highest netlink attribute number
* @family: address family for AF-specific types
* @flags: expression type flags
*/
struct nft_expr_type {
const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
const struct nlattr * const tb[]);
void (*release_ops)(const struct nft_expr_ops *ops);
const struct nft_expr_ops *ops;
const struct nft_expr_ops *inner_ops;
struct list_head list;
const char *name;
struct module *owner;
const struct nla_policy *policy;
unsigned int maxattr;
u8 family;
u8 flags;
};
#define NFT_EXPR_STATEFUL 0x1
#define NFT_EXPR_GC 0x2
enum nft_trans_phase {
NFT_TRANS_PREPARE,
NFT_TRANS_PREPARE_ERROR,
NFT_TRANS_ABORT,
NFT_TRANS_COMMIT,
NFT_TRANS_RELEASE
};
struct nft_flow_rule;
struct nft_offload_ctx;
/**
* struct nft_expr_ops - nf_tables expression operations
*
* @eval: Expression evaluation function
* @clone: Expression clone function
* @size: full expression size, including private data size
* @init: initialization function
* @activate: activate expression in the next generation
* @deactivate: deactivate expression in next generation
* @destroy: destruction function, called after synchronize_rcu
* @destroy_clone: destruction clone function
* @dump: function to dump parameters
* @validate: validate expression, called during loop detection
* @reduce: reduce expression
* @gc: garbage collection expression
* @offload: hardware offload expression
* @offload_action: function to report true/false to allocate one slot or not in the flow
* offload array
* @offload_stats: function to synchronize hardware stats via updating the counter expression
* @type: expression type
* @data: extra data to attach to this expression operation
*/
struct nft_expr_ops {
void (*eval)(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt);
int (*clone)(struct nft_expr *dst,
const struct nft_expr *src, gfp_t gfp);
unsigned int size;
int (*init)(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[]);
void (*activate)(const struct nft_ctx *ctx,
const struct nft_expr *expr);
void (*deactivate)(const struct nft_ctx *ctx,
const struct nft_expr *expr,
enum nft_trans_phase phase);
void (*destroy)(const struct nft_ctx *ctx,
const struct nft_expr *expr);
void (*destroy_clone)(const struct nft_ctx *ctx,
const struct nft_expr *expr);
int (*dump)(struct sk_buff *skb,
const struct nft_expr *expr,
bool reset);
int (*validate)(const struct nft_ctx *ctx,
const struct nft_expr *expr);
bool (*reduce)(struct nft_regs_track *track,
const struct nft_expr *expr);
bool (*gc)(struct net *net,
const struct nft_expr *expr);
int (*offload)(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_expr *expr);
bool (*offload_action)(const struct nft_expr *expr);
void (*offload_stats)(struct nft_expr *expr,
const struct flow_stats *stats);
const struct nft_expr_type *type;
void *data;
};
/**
* struct nft_rule - nf_tables rule
*
* @list: used internally
* @handle: rule handle
* @genmask: generation mask
* @dlen: length of expression data
* @udata: user data is appended to the rule
* @data: expression data
*/
struct nft_rule {
struct list_head list;
u64 handle:42,
genmask:2,
dlen:12,
udata:1;
unsigned char data[]
__attribute__((aligned(__alignof__(struct nft_expr))));
};
static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
{
return (struct nft_expr *)&rule->data[0];
}
static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
{
return ((void *)expr) + expr->ops->size;
}
static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
{
return (struct nft_expr *)&rule->data[rule->dlen];
}
static inline bool nft_expr_more(const struct nft_rule *rule,
const struct nft_expr *expr)
{
return expr != nft_expr_last(rule) && expr->ops;
}
static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
{
return (void *)&rule->data[rule->dlen];
}
void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule);
void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
enum nft_trans_phase phase);
void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule);
static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_set_elem_expr *elem_expr;
struct nft_expr *expr;
u32 size;
if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) {
elem_expr = nft_set_ext_expr(ext);
nft_setelem_expr_foreach(expr, elem_expr, size) {
expr->ops->eval(expr, regs, pkt);
if (regs->verdict.code == NFT_BREAK)
return;
}
}
}
/*
* The last pointer isn't really necessary, but the compiler isn't able to
* determine that the result of nft_expr_last() is always the same since it
* can't assume that the dlen value wasn't changed within calls in the loop.
*/
#define nft_rule_for_each_expr(expr, last, rule) \
for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
(expr) != (last); \
(expr) = nft_expr_next(expr))
#define NFT_CHAIN_POLICY_UNSET U8_MAX
struct nft_rule_dp {
u64 is_last:1,
dlen:12,
handle:42; /* for tracing */
unsigned char data[]
__attribute__((aligned(__alignof__(struct nft_expr))));
};
struct nft_rule_dp_last {
struct nft_rule_dp end; /* end of nft_rule_blob marker */
struct rcu_head h; /* call_rcu head */
struct nft_rule_blob *blob; /* ptr to free via call_rcu */
const struct nft_chain *chain; /* for nftables tracing */
};
static inline const struct nft_rule_dp *nft_rule_next(const struct nft_rule_dp *rule)
{
return (void *)rule + sizeof(*rule) + rule->dlen;
}
struct nft_rule_blob {
unsigned long size;
unsigned char data[]
__attribute__((aligned(__alignof__(struct nft_rule_dp))));
};
/**
* struct nft_chain - nf_tables chain
*
* @blob_gen_0: rule blob pointer to the current generation
* @blob_gen_1: rule blob pointer to the future generation
* @rules: list of rules in the chain
* @list: used internally
* @rhlhead: used internally
* @table: table that this chain belongs to
* @handle: chain handle
* @use: number of jump references to this chain
* @flags: bitmask of enum NFTA_CHAIN_FLAGS
* @bound: bind or not
* @genmask: generation mask
* @name: name of the chain
* @udlen: user data length
* @udata: user data in the chain
* @blob_next: rule blob pointer to the next in the chain
*/
struct nft_chain {
struct nft_rule_blob __rcu *blob_gen_0;
struct nft_rule_blob __rcu *blob_gen_1;
struct list_head rules;
struct list_head list;
struct rhlist_head rhlhead;
struct nft_table *table;
u64 handle;
u32 use;
u8 flags:5,
bound:1,
genmask:2;
char *name;
u16 udlen;
u8 *udata;
/* Only used during control plane commit phase: */
struct nft_rule_blob *blob_next;
};
int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain);
int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
const struct nft_set_iter *iter,
struct nft_elem_priv *elem_priv);
int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set);
int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
enum nft_chain_types {
NFT_CHAIN_T_DEFAULT = 0,
NFT_CHAIN_T_ROUTE,
NFT_CHAIN_T_NAT,
NFT_CHAIN_T_MAX
};
/**
* struct nft_chain_type - nf_tables chain type info
*
* @name: name of the type
* @type: numeric identifier
* @family: address family
* @owner: module owner
* @hook_mask: mask of valid hooks
* @hooks: array of hook functions
* @ops_register: base chain register function
* @ops_unregister: base chain unregister function
*/
struct nft_chain_type {
const char *name;
enum nft_chain_types type;
int family;
struct module *owner;
unsigned int hook_mask;
nf_hookfn *hooks[NFT_MAX_HOOKS];
int (*ops_register)(struct net *net, const struct nf_hook_ops *ops);
void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops);
};
int nft_chain_validate_dependency(const struct nft_chain *chain,
enum nft_chain_types type);
int nft_chain_validate_hooks(const struct nft_chain *chain,
unsigned int hook_flags);
static inline bool nft_chain_binding(const struct nft_chain *chain)
{
return chain->flags & NFT_CHAIN_BINDING;
}
static inline bool nft_chain_is_bound(struct nft_chain *chain)
{
return (chain->flags & NFT_CHAIN_BINDING) && chain->bound;
}
int nft_chain_add(struct nft_table *table, struct nft_chain *chain);
void nft_chain_del(struct nft_chain *chain);
void nf_tables_chain_destroy(struct nft_chain *chain);
struct nft_stats {
u64 bytes;
u64 pkts;
struct u64_stats_sync syncp;
};
struct nft_hook {
struct list_head list;
struct nf_hook_ops ops;
struct rcu_head rcu;
};
/**
* struct nft_base_chain - nf_tables base chain
*
* @ops: netfilter hook ops
* @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family)
* @type: chain type
* @policy: default policy
* @flags: indicate the base chain disabled or not
* @stats: per-cpu chain stats
* @chain: the chain
* @flow_block: flow block (for hardware offload)
*/
struct nft_base_chain {
struct nf_hook_ops ops;
struct list_head hook_list;
const struct nft_chain_type *type;
u8 policy;
u8 flags;
struct nft_stats __percpu *stats;
struct nft_chain chain;
struct flow_block flow_block;
};
static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
{
return container_of(chain, struct nft_base_chain, chain);
}
static inline bool nft_is_base_chain(const struct nft_chain *chain)
{
return chain->flags & NFT_CHAIN_BASE;
}
int __nft_release_basechain(struct nft_ctx *ctx);
unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
static inline bool nft_use_inc(u32 *use)
{
if (*use == UINT_MAX)
return false;
(*use)++;
return true;
}
static inline void nft_use_dec(u32 *use)
{
WARN_ON_ONCE((*use)-- == 0);
}
/* For error and abort path: restore use counter to previous state. */
static inline void nft_use_inc_restore(u32 *use)
{
WARN_ON_ONCE(!nft_use_inc(use));
}
#define nft_use_dec_restore nft_use_dec
/**
* struct nft_table - nf_tables table
*
* @list: used internally
* @chains_ht: chains in the table
* @chains: same, for stable walks
* @sets: sets in the table
* @objects: stateful objects in the table
* @flowtables: flow tables in the table
* @hgenerator: handle generator state
* @handle: table handle
* @use: number of chain references to this table
* @family:address family
* @flags: table flag (see enum nft_table_flags)
* @genmask: generation mask
* @nlpid: netlink port ID
* @name: name of the table
* @udlen: length of the user data
* @udata: user data
* @validate_state: internal, set when transaction adds jumps
*/
struct nft_table {
struct list_head list;
struct rhltable chains_ht;
struct list_head chains;
struct list_head sets;
struct list_head objects;
struct list_head flowtables;
u64 hgenerator;
u64 handle;
u32 use;
u16 family:6,
flags:8,
genmask:2;
u32 nlpid;
char *name;
u16 udlen;
u8 *udata;
u8 validate_state;
};
static inline bool nft_table_has_owner(const struct nft_table *table)
{
return table->flags & NFT_TABLE_F_OWNER;
}
static inline bool nft_table_is_orphan(const struct nft_table *table)
{
return (table->flags & (NFT_TABLE_F_OWNER | NFT_TABLE_F_PERSIST)) ==
NFT_TABLE_F_PERSIST;
}
static inline bool nft_base_chain_netdev(int family, u32 hooknum)
{
return family == NFPROTO_NETDEV ||
(family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
}
void nft_register_chain_type(const struct nft_chain_type *);
void nft_unregister_chain_type(const struct nft_chain_type *);
int nft_register_expr(struct nft_expr_type *);
void nft_unregister_expr(struct nft_expr_type *);
int nft_verdict_dump(struct sk_buff *skb, int type,
const struct nft_verdict *v);
/**
* struct nft_object_hash_key - key to lookup nft_object
*
* @name: name of the stateful object to look up
* @table: table the object belongs to
*/
struct nft_object_hash_key {
const char *name;
const struct nft_table *table;
};
/**
* struct nft_object - nf_tables stateful object
*
* @list: table stateful object list node
* @rhlhead: nft_objname_ht node
* @key: keys that identify this object
* @genmask: generation mask
* @use: number of references to this stateful object
* @handle: unique object handle
* @udlen: length of user data
* @udata: user data
* @ops: object operations
* @data: object data, layout depends on type
*/
struct nft_object {
struct list_head list;
struct rhlist_head rhlhead;
struct nft_object_hash_key key;
u32 genmask:2;
u32 use;
u64 handle;
u16 udlen;
u8 *udata;
/* runtime data below here */
const struct nft_object_ops *ops ____cacheline_aligned;
unsigned char data[]
__attribute__((aligned(__alignof__(u64))));
};
static inline void *nft_obj_data(const struct nft_object *obj)
{
return (void *)obj->data;
}
#define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
struct nft_object *nft_obj_lookup(const struct net *net,
const struct nft_table *table,
const struct nlattr *nla, u32 objtype,
u8 genmask);
void nft_obj_notify(struct net *net, const struct nft_table *table,
struct nft_object *obj, u32 portid, u32 seq,
int event, u16 flags, int family, int report, gfp_t gfp);
/**
* struct nft_object_type - stateful object type
*
* @select_ops: function to select nft_object_ops
* @ops: default ops, used when no select_ops functions is present
* @list: list node in list of object types
* @type: stateful object numeric type
* @owner: module owner
* @maxattr: maximum netlink attribute
* @family: address family for AF-specific object types
* @policy: netlink attribute policy
*/
struct nft_object_type {
const struct nft_object_ops *(*select_ops)(const struct nft_ctx *,
const struct nlattr * const tb[]);
const struct nft_object_ops *ops;
struct list_head list;
u32 type;
unsigned int maxattr;
u8 family;
struct module *owner;
const struct nla_policy *policy;
};
/**
* struct nft_object_ops - stateful object operations
*
* @eval: stateful object evaluation function
* @size: stateful object size
* @init: initialize object from netlink attributes
* @destroy: release existing stateful object
* @dump: netlink dump stateful object
* @update: update stateful object
* @type: pointer to object type
*/
struct nft_object_ops {
void (*eval)(struct nft_object *obj,
struct nft_regs *regs,
const struct nft_pktinfo *pkt);
unsigned int size;
int (*init)(const struct nft_ctx *ctx,
const struct nlattr *const tb[],
struct nft_object *obj);
void (*destroy)(const struct nft_ctx *ctx,
struct nft_object *obj);
int (*dump)(struct sk_buff *skb,
struct nft_object *obj,
bool reset);
void (*update)(struct nft_object *obj,
struct nft_object *newobj);
const struct nft_object_type *type;
};
int nft_register_obj(struct nft_object_type *obj_type);
void nft_unregister_obj(struct nft_object_type *obj_type);
#define NFT_NETDEVICE_MAX 256
/**
* struct nft_flowtable - nf_tables flow table
*
* @list: flow table list node in table list
* @table: the table the flow table is contained in
* @name: name of this flow table
* @hooknum: hook number
* @ops_len: number of hooks in array
* @genmask: generation mask
* @use: number of references to this flow table
* @handle: unique object handle
* @hook_list: hook list for hooks per net_device in flowtables
* @data: rhashtable and garbage collector
*/
struct nft_flowtable {
struct list_head list;
struct nft_table *table;
char *name;
int hooknum;
int ops_len;
u32 genmask:2;
u32 use;
u64 handle;
/* runtime data below here */
struct list_head hook_list ____cacheline_aligned;
struct nf_flowtable data;
};
struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
const struct nlattr *nla,
u8 genmask);
void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
struct nft_flowtable *flowtable,
enum nft_trans_phase phase);
void nft_register_flowtable_type(struct nf_flowtable_type *type);
void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
/**
* struct nft_traceinfo - nft tracing information and state
*
* @trace: other struct members are initialised
* @nf_trace: copy of skb->nf_trace before rule evaluation
* @type: event type (enum nft_trace_types)
* @skbid: hash of skb to be used as trace id
* @packet_dumped: packet headers sent in a previous traceinfo message
* @basechain: base chain currently processed
*/
struct nft_traceinfo {
bool trace;
bool nf_trace;
bool packet_dumped;
enum nft_trace_types type:8;
u32 skbid;
const struct nft_base_chain *basechain;
};
void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
const struct nft_chain *basechain);
void nft_trace_notify(const struct nft_pktinfo *pkt,
const struct nft_verdict *verdict,
const struct nft_rule_dp *rule,
struct nft_traceinfo *info);
#define MODULE_ALIAS_NFT_CHAIN(family, name) \
MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
#define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
#define MODULE_ALIAS_NFT_EXPR(name) \
MODULE_ALIAS("nft-expr-" name)
#define MODULE_ALIAS_NFT_OBJ(type) \
MODULE_ALIAS("nft-obj-" __stringify(type))
#if IS_ENABLED(CONFIG_NF_TABLES)
/*
* The gencursor defines two generations, the currently active and the
* next one. Objects contain a bitmask of 2 bits specifying the generations
* they're active in. A set bit means they're inactive in the generation
* represented by that bit.
*
* New objects start out as inactive in the current and active in the
* next generation. When committing the ruleset the bitmask is cleared,
* meaning they're active in all generations. When removing an object,
* it is set inactive in the next generation. After committing the ruleset,
* the objects are removed.
*/
static inline unsigned int nft_gencursor_next(const struct net *net)
{
return net->nft.gencursor + 1 == 1 ? 1 : 0;
}
static inline u8 nft_genmask_next(const struct net *net)
{
return 1 << nft_gencursor_next(net);
}
static inline u8 nft_genmask_cur(const struct net *net)
{
/* Use READ_ONCE() to prevent refetching the value for atomicity */
return 1 << READ_ONCE(net->nft.gencursor);
}
#define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
/*
* Generic transaction helpers
*/
/* Check if this object is currently active. */
#define nft_is_active(__net, __obj) \
(((__obj)->genmask & nft_genmask_cur(__net)) == 0)
/* Check if this object is active in the next generation. */
#define nft_is_active_next(__net, __obj) \
(((__obj)->genmask & nft_genmask_next(__net)) == 0)
/* This object becomes active in the next generation. */
#define nft_activate_next(__net, __obj) \
(__obj)->genmask = nft_genmask_cur(__net)
/* This object becomes inactive in the next generation. */
#define nft_deactivate_next(__net, __obj) \
(__obj)->genmask = nft_genmask_next(__net)
/* After committing the ruleset, clear the stale generation bit. */
#define nft_clear(__net, __obj) \
(__obj)->genmask &= ~nft_genmask_next(__net)
#define nft_active_genmask(__obj, __genmask) \
!((__obj)->genmask & __genmask)
/*
* Set element transaction helpers
*/
static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
u8 genmask)
{
return !(ext->genmask & genmask);
}
static inline void nft_set_elem_change_active(const struct net *net,
const struct nft_set *set,
struct nft_set_ext *ext)
{
ext->genmask ^= nft_genmask_next(net);
}
#endif /* IS_ENABLED(CONFIG_NF_TABLES) */
#define NFT_SET_ELEM_DEAD_MASK (1 << 2)
#if defined(__LITTLE_ENDIAN_BITFIELD)
#define NFT_SET_ELEM_DEAD_BIT 2
#elif defined(__BIG_ENDIAN_BITFIELD)
#define NFT_SET_ELEM_DEAD_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
#else
#error
#endif
static inline void nft_set_elem_dead(struct nft_set_ext *ext)
{
unsigned long *word = (unsigned long *)ext;
BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
set_bit(NFT_SET_ELEM_DEAD_BIT, word);
}
static inline int nft_set_elem_is_dead(const struct nft_set_ext *ext)
{
unsigned long *word = (unsigned long *)ext;
BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
return test_bit(NFT_SET_ELEM_DEAD_BIT, word);
}
/**
* struct nft_trans - nf_tables object update in transaction
*
* @list: used internally
* @net: struct net
* @table: struct nft_table the object resides in
* @msg_type: message type
* @seq: netlink sequence number
* @flags: modifiers to new request
* @report: notify via unicast netlink message
* @put_net: net needs to be put
*
* This is the information common to all objects in the transaction,
* this must always be the first member of derived sub-types.
*/
struct nft_trans {
struct list_head list;
struct net *net;
struct nft_table *table;
int msg_type;
u32 seq;
u16 flags;
u8 report:1;
u8 put_net:1;
};
/**
* struct nft_trans_binding - nf_tables object with binding support in transaction
* @nft_trans: base structure, MUST be first member
* @binding_list: list of objects with possible bindings
*
* This is the base type used by objects that can be bound to a chain.
*/
struct nft_trans_binding {
struct nft_trans nft_trans;
struct list_head binding_list;
};
struct nft_trans_rule {
struct nft_trans nft_trans;
struct nft_rule *rule;
struct nft_chain *chain;
struct nft_flow_rule *flow;
u32 rule_id;
bool bound;
};
#define nft_trans_container_rule(trans) \
container_of(trans, struct nft_trans_rule, nft_trans)
#define nft_trans_rule(trans) \
nft_trans_container_rule(trans)->rule
#define nft_trans_flow_rule(trans) \
nft_trans_container_rule(trans)->flow
#define nft_trans_rule_id(trans) \
nft_trans_container_rule(trans)->rule_id
#define nft_trans_rule_bound(trans) \
nft_trans_container_rule(trans)->bound
#define nft_trans_rule_chain(trans) \
nft_trans_container_rule(trans)->chain
struct nft_trans_set {
struct nft_trans_binding nft_trans_binding;
struct list_head list_trans_newset;
struct nft_set *set;
u32 set_id;
u32 gc_int;
u64 timeout;
bool update;
bool bound;
u32 size;
};
#define nft_trans_container_set(t) \
container_of(t, struct nft_trans_set, nft_trans_binding.nft_trans)
#define nft_trans_set(trans) \
nft_trans_container_set(trans)->set
#define nft_trans_set_id(trans) \
nft_trans_container_set(trans)->set_id
#define nft_trans_set_bound(trans) \
nft_trans_container_set(trans)->bound
#define nft_trans_set_update(trans) \
nft_trans_container_set(trans)->update
#define nft_trans_set_timeout(trans) \
nft_trans_container_set(trans)->timeout
#define nft_trans_set_gc_int(trans) \
nft_trans_container_set(trans)->gc_int
#define nft_trans_set_size(trans) \
nft_trans_container_set(trans)->size
struct nft_trans_chain {
struct nft_trans_binding nft_trans_binding;
struct nft_chain *chain;
char *name;
struct nft_stats __percpu *stats;
u8 policy;
bool update;
bool bound;
u32 chain_id;
struct nft_base_chain *basechain;
struct list_head hook_list;
};
#define nft_trans_container_chain(t) \
container_of(t, struct nft_trans_chain, nft_trans_binding.nft_trans)
#define nft_trans_chain(trans) \
nft_trans_container_chain(trans)->chain
#define nft_trans_chain_update(trans) \
nft_trans_container_chain(trans)->update
#define nft_trans_chain_name(trans) \
nft_trans_container_chain(trans)->name
#define nft_trans_chain_stats(trans) \
nft_trans_container_chain(trans)->stats
#define nft_trans_chain_policy(trans) \
nft_trans_container_chain(trans)->policy
#define nft_trans_chain_bound(trans) \
nft_trans_container_chain(trans)->bound
#define nft_trans_chain_id(trans) \
nft_trans_container_chain(trans)->chain_id
#define nft_trans_basechain(trans) \
nft_trans_container_chain(trans)->basechain
#define nft_trans_chain_hooks(trans) \
nft_trans_container_chain(trans)->hook_list
struct nft_trans_table {
struct nft_trans nft_trans;
bool update;
};
#define nft_trans_container_table(trans) \
container_of(trans, struct nft_trans_table, nft_trans)
#define nft_trans_table_update(trans) \
nft_trans_container_table(trans)->update
enum nft_trans_elem_flags {
NFT_TRANS_UPD_TIMEOUT = (1 << 0),
NFT_TRANS_UPD_EXPIRATION = (1 << 1),
};
struct nft_trans_elem {
struct nft_trans nft_trans;
struct nft_set *set;
struct nft_elem_priv *elem_priv;
u64 timeout;
u64 expiration;
u8 update_flags;
bool bound;
};
#define nft_trans_container_elem(t) \
container_of(t, struct nft_trans_elem, nft_trans)
#define nft_trans_elem_set(trans) \
nft_trans_container_elem(trans)->set
#define nft_trans_elem_priv(trans) \
nft_trans_container_elem(trans)->elem_priv
#define nft_trans_elem_update_flags(trans) \
nft_trans_container_elem(trans)->update_flags
#define nft_trans_elem_timeout(trans) \
nft_trans_container_elem(trans)->timeout
#define nft_trans_elem_expiration(trans) \
nft_trans_container_elem(trans)->expiration
#define nft_trans_elem_set_bound(trans) \
nft_trans_container_elem(trans)->bound
struct nft_trans_obj {
struct nft_trans nft_trans;
struct nft_object *obj;
struct nft_object *newobj;
bool update;
};
#define nft_trans_container_obj(t) \
container_of(t, struct nft_trans_obj, nft_trans)
#define nft_trans_obj(trans) \
nft_trans_container_obj(trans)->obj
#define nft_trans_obj_newobj(trans) \
nft_trans_container_obj(trans)->newobj
#define nft_trans_obj_update(trans) \
nft_trans_container_obj(trans)->update
struct nft_trans_flowtable {
struct nft_trans nft_trans;
struct nft_flowtable *flowtable;
struct list_head hook_list;
u32 flags;
bool update;
};
#define nft_trans_container_flowtable(t) \
container_of(t, struct nft_trans_flowtable, nft_trans)
#define nft_trans_flowtable(trans) \
nft_trans_container_flowtable(trans)->flowtable
#define nft_trans_flowtable_update(trans) \
nft_trans_container_flowtable(trans)->update
#define nft_trans_flowtable_hooks(trans) \
nft_trans_container_flowtable(trans)->hook_list
#define nft_trans_flowtable_flags(trans) \
nft_trans_container_flowtable(trans)->flags
#define NFT_TRANS_GC_BATCHCOUNT 256
struct nft_trans_gc {
struct list_head list;
struct net *net;
struct nft_set *set;
u32 seq;
u16 count;
struct nft_elem_priv *priv[NFT_TRANS_GC_BATCHCOUNT];
struct rcu_head rcu;
};
static inline void nft_ctx_update(struct nft_ctx *ctx,
const struct nft_trans *trans)
{
switch (trans->msg_type) {
case NFT_MSG_NEWRULE:
case NFT_MSG_DELRULE:
case NFT_MSG_DESTROYRULE:
ctx->chain = nft_trans_rule_chain(trans);
break;
case NFT_MSG_NEWCHAIN:
case NFT_MSG_DELCHAIN:
case NFT_MSG_DESTROYCHAIN:
ctx->chain = nft_trans_chain(trans);
break;
default:
ctx->chain = NULL;
break;
}
ctx->net = trans->net;
ctx->table = trans->table;
ctx->family = trans->table->family;
ctx->report = trans->report;
ctx->flags = trans->flags;
ctx->seq = trans->seq;
}
struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
unsigned int gc_seq, gfp_t gfp);
void nft_trans_gc_destroy(struct nft_trans_gc *trans);
struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
unsigned int gc_seq, gfp_t gfp);
void nft_trans_gc_queue_async_done(struct nft_trans_gc *gc);
struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp);
void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans);
void nft_trans_gc_elem_add(struct nft_trans_gc *gc, void *priv);
struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
unsigned int gc_seq);
struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc);
void nft_setelem_data_deactivate(const struct net *net,
const struct nft_set *set,
struct nft_elem_priv *elem_priv);
int __init nft_chain_filter_init(void);
void nft_chain_filter_fini(void);
void __init nft_chain_route_init(void);
void nft_chain_route_fini(void);
void nf_tables_trans_destroy_flush_work(void);
int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
__be64 nf_jiffies64_to_msecs(u64 input);
#ifdef CONFIG_MODULES
__printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...);
#else
static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; }
#endif
struct nftables_pernet {
struct list_head tables;
struct list_head commit_list;
struct list_head commit_set_list;
struct list_head binding_list;
struct list_head module_list;
struct list_head notify_list;
struct mutex commit_mutex;
u64 table_handle;
u64 tstamp;
unsigned int base_seq;
unsigned int gc_seq;
u8 validate_state;
};
extern unsigned int nf_tables_net_id;
static inline struct nftables_pernet *nft_pernet(const struct net *net)
{
return net_generic(net, nf_tables_net_id);
}
static inline u64 nft_net_tstamp(const struct net *net)
{
return nft_pernet(net)->tstamp;
}
#define __NFT_REDUCE_READONLY 1UL
#define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY
static inline bool nft_reduce_is_readonly(const struct nft_expr *expr)
{
return expr->ops->reduce == NFT_REDUCE_READONLY;
}
void nft_reg_track_update(struct nft_regs_track *track,
const struct nft_expr *expr, u8 dreg, u8 len);
void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len);
void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg);
static inline bool nft_reg_track_cmp(struct nft_regs_track *track,
const struct nft_expr *expr, u8 dreg)
{
return track->regs[dreg].selector &&
track->regs[dreg].selector->ops == expr->ops &&
track->regs[dreg].num_reg == 0;
}
#endif /* _NET_NF_TABLES_H */
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