452 строки
10 KiB
C
452 строки
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* Copyright (c) 2017 - 2018 Covalent IO, Inc. http://covalent.io */
|
|
|
|
#ifndef _LINUX_SKMSG_H
|
|
#define _LINUX_SKMSG_H
|
|
|
|
#include <linux/bpf.h>
|
|
#include <linux/filter.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/skbuff.h>
|
|
|
|
#include <net/sock.h>
|
|
#include <net/tcp.h>
|
|
#include <net/strparser.h>
|
|
|
|
#define MAX_MSG_FRAGS MAX_SKB_FRAGS
|
|
|
|
enum __sk_action {
|
|
__SK_DROP = 0,
|
|
__SK_PASS,
|
|
__SK_REDIRECT,
|
|
__SK_NONE,
|
|
};
|
|
|
|
struct sk_msg_sg {
|
|
u32 start;
|
|
u32 curr;
|
|
u32 end;
|
|
u32 size;
|
|
u32 copybreak;
|
|
bool copy[MAX_MSG_FRAGS];
|
|
/* The extra element is used for chaining the front and sections when
|
|
* the list becomes partitioned (e.g. end < start). The crypto APIs
|
|
* require the chaining.
|
|
*/
|
|
struct scatterlist data[MAX_MSG_FRAGS + 1];
|
|
};
|
|
|
|
/* UAPI in filter.c depends on struct sk_msg_sg being first element. */
|
|
struct sk_msg {
|
|
struct sk_msg_sg sg;
|
|
void *data;
|
|
void *data_end;
|
|
u32 apply_bytes;
|
|
u32 cork_bytes;
|
|
u32 flags;
|
|
struct sk_buff *skb;
|
|
struct sock *sk_redir;
|
|
struct sock *sk;
|
|
struct list_head list;
|
|
};
|
|
|
|
struct sk_psock_progs {
|
|
struct bpf_prog *msg_parser;
|
|
struct bpf_prog *skb_parser;
|
|
struct bpf_prog *skb_verdict;
|
|
};
|
|
|
|
enum sk_psock_state_bits {
|
|
SK_PSOCK_TX_ENABLED,
|
|
};
|
|
|
|
struct sk_psock_link {
|
|
struct list_head list;
|
|
struct bpf_map *map;
|
|
void *link_raw;
|
|
};
|
|
|
|
struct sk_psock_parser {
|
|
struct strparser strp;
|
|
bool enabled;
|
|
void (*saved_data_ready)(struct sock *sk);
|
|
};
|
|
|
|
struct sk_psock_work_state {
|
|
struct sk_buff *skb;
|
|
u32 len;
|
|
u32 off;
|
|
};
|
|
|
|
struct sk_psock {
|
|
struct sock *sk;
|
|
struct sock *sk_redir;
|
|
u32 apply_bytes;
|
|
u32 cork_bytes;
|
|
u32 eval;
|
|
struct sk_msg *cork;
|
|
struct sk_psock_progs progs;
|
|
struct sk_psock_parser parser;
|
|
struct sk_buff_head ingress_skb;
|
|
struct list_head ingress_msg;
|
|
unsigned long state;
|
|
struct list_head link;
|
|
spinlock_t link_lock;
|
|
refcount_t refcnt;
|
|
void (*saved_unhash)(struct sock *sk);
|
|
void (*saved_close)(struct sock *sk, long timeout);
|
|
void (*saved_write_space)(struct sock *sk);
|
|
struct proto *sk_proto;
|
|
struct sk_psock_work_state work_state;
|
|
struct work_struct work;
|
|
union {
|
|
struct rcu_head rcu;
|
|
struct work_struct gc;
|
|
};
|
|
};
|
|
|
|
int sk_msg_alloc(struct sock *sk, struct sk_msg *msg, int len,
|
|
int elem_first_coalesce);
|
|
int sk_msg_clone(struct sock *sk, struct sk_msg *dst, struct sk_msg *src,
|
|
u32 off, u32 len);
|
|
void sk_msg_trim(struct sock *sk, struct sk_msg *msg, int len);
|
|
int sk_msg_free(struct sock *sk, struct sk_msg *msg);
|
|
int sk_msg_free_nocharge(struct sock *sk, struct sk_msg *msg);
|
|
void sk_msg_free_partial(struct sock *sk, struct sk_msg *msg, u32 bytes);
|
|
void sk_msg_free_partial_nocharge(struct sock *sk, struct sk_msg *msg,
|
|
u32 bytes);
|
|
|
|
void sk_msg_return(struct sock *sk, struct sk_msg *msg, int bytes);
|
|
void sk_msg_return_zero(struct sock *sk, struct sk_msg *msg, int bytes);
|
|
|
|
int sk_msg_zerocopy_from_iter(struct sock *sk, struct iov_iter *from,
|
|
struct sk_msg *msg, u32 bytes);
|
|
int sk_msg_memcopy_from_iter(struct sock *sk, struct iov_iter *from,
|
|
struct sk_msg *msg, u32 bytes);
|
|
|
|
static inline void sk_msg_check_to_free(struct sk_msg *msg, u32 i, u32 bytes)
|
|
{
|
|
WARN_ON(i == msg->sg.end && bytes);
|
|
}
|
|
|
|
static inline void sk_msg_apply_bytes(struct sk_psock *psock, u32 bytes)
|
|
{
|
|
if (psock->apply_bytes) {
|
|
if (psock->apply_bytes < bytes)
|
|
psock->apply_bytes = 0;
|
|
else
|
|
psock->apply_bytes -= bytes;
|
|
}
|
|
}
|
|
|
|
#define sk_msg_iter_var_prev(var) \
|
|
do { \
|
|
if (var == 0) \
|
|
var = MAX_MSG_FRAGS - 1; \
|
|
else \
|
|
var--; \
|
|
} while (0)
|
|
|
|
#define sk_msg_iter_var_next(var) \
|
|
do { \
|
|
var++; \
|
|
if (var == MAX_MSG_FRAGS) \
|
|
var = 0; \
|
|
} while (0)
|
|
|
|
#define sk_msg_iter_prev(msg, which) \
|
|
sk_msg_iter_var_prev(msg->sg.which)
|
|
|
|
#define sk_msg_iter_next(msg, which) \
|
|
sk_msg_iter_var_next(msg->sg.which)
|
|
|
|
static inline void sk_msg_clear_meta(struct sk_msg *msg)
|
|
{
|
|
memset(&msg->sg, 0, offsetofend(struct sk_msg_sg, copy));
|
|
}
|
|
|
|
static inline void sk_msg_init(struct sk_msg *msg)
|
|
{
|
|
BUILD_BUG_ON(ARRAY_SIZE(msg->sg.data) - 1 != MAX_MSG_FRAGS);
|
|
memset(msg, 0, sizeof(*msg));
|
|
sg_init_marker(msg->sg.data, MAX_MSG_FRAGS);
|
|
}
|
|
|
|
static inline void sk_msg_xfer(struct sk_msg *dst, struct sk_msg *src,
|
|
int which, u32 size)
|
|
{
|
|
dst->sg.data[which] = src->sg.data[which];
|
|
dst->sg.data[which].length = size;
|
|
dst->sg.size += size;
|
|
src->sg.data[which].length -= size;
|
|
src->sg.data[which].offset += size;
|
|
}
|
|
|
|
static inline void sk_msg_xfer_full(struct sk_msg *dst, struct sk_msg *src)
|
|
{
|
|
memcpy(dst, src, sizeof(*src));
|
|
sk_msg_init(src);
|
|
}
|
|
|
|
static inline bool sk_msg_full(const struct sk_msg *msg)
|
|
{
|
|
return (msg->sg.end == msg->sg.start) && msg->sg.size;
|
|
}
|
|
|
|
static inline u32 sk_msg_elem_used(const struct sk_msg *msg)
|
|
{
|
|
if (sk_msg_full(msg))
|
|
return MAX_MSG_FRAGS;
|
|
|
|
return msg->sg.end >= msg->sg.start ?
|
|
msg->sg.end - msg->sg.start :
|
|
msg->sg.end + (MAX_MSG_FRAGS - msg->sg.start);
|
|
}
|
|
|
|
static inline struct scatterlist *sk_msg_elem(struct sk_msg *msg, int which)
|
|
{
|
|
return &msg->sg.data[which];
|
|
}
|
|
|
|
static inline struct scatterlist sk_msg_elem_cpy(struct sk_msg *msg, int which)
|
|
{
|
|
return msg->sg.data[which];
|
|
}
|
|
|
|
static inline struct page *sk_msg_page(struct sk_msg *msg, int which)
|
|
{
|
|
return sg_page(sk_msg_elem(msg, which));
|
|
}
|
|
|
|
static inline bool sk_msg_to_ingress(const struct sk_msg *msg)
|
|
{
|
|
return msg->flags & BPF_F_INGRESS;
|
|
}
|
|
|
|
static inline void sk_msg_compute_data_pointers(struct sk_msg *msg)
|
|
{
|
|
struct scatterlist *sge = sk_msg_elem(msg, msg->sg.start);
|
|
|
|
if (msg->sg.copy[msg->sg.start]) {
|
|
msg->data = NULL;
|
|
msg->data_end = NULL;
|
|
} else {
|
|
msg->data = sg_virt(sge);
|
|
msg->data_end = msg->data + sge->length;
|
|
}
|
|
}
|
|
|
|
static inline void sk_msg_page_add(struct sk_msg *msg, struct page *page,
|
|
u32 len, u32 offset)
|
|
{
|
|
struct scatterlist *sge;
|
|
|
|
get_page(page);
|
|
sge = sk_msg_elem(msg, msg->sg.end);
|
|
sg_set_page(sge, page, len, offset);
|
|
sg_unmark_end(sge);
|
|
|
|
msg->sg.copy[msg->sg.end] = true;
|
|
msg->sg.size += len;
|
|
sk_msg_iter_next(msg, end);
|
|
}
|
|
|
|
static inline void sk_msg_sg_copy(struct sk_msg *msg, u32 i, bool copy_state)
|
|
{
|
|
do {
|
|
msg->sg.copy[i] = copy_state;
|
|
sk_msg_iter_var_next(i);
|
|
if (i == msg->sg.end)
|
|
break;
|
|
} while (1);
|
|
}
|
|
|
|
static inline void sk_msg_sg_copy_set(struct sk_msg *msg, u32 start)
|
|
{
|
|
sk_msg_sg_copy(msg, start, true);
|
|
}
|
|
|
|
static inline void sk_msg_sg_copy_clear(struct sk_msg *msg, u32 start)
|
|
{
|
|
sk_msg_sg_copy(msg, start, false);
|
|
}
|
|
|
|
static inline struct sk_psock *sk_psock(const struct sock *sk)
|
|
{
|
|
return rcu_dereference_sk_user_data(sk);
|
|
}
|
|
|
|
static inline void sk_psock_queue_msg(struct sk_psock *psock,
|
|
struct sk_msg *msg)
|
|
{
|
|
list_add_tail(&msg->list, &psock->ingress_msg);
|
|
}
|
|
|
|
static inline bool sk_psock_queue_empty(const struct sk_psock *psock)
|
|
{
|
|
return psock ? list_empty(&psock->ingress_msg) : true;
|
|
}
|
|
|
|
static inline void sk_psock_report_error(struct sk_psock *psock, int err)
|
|
{
|
|
struct sock *sk = psock->sk;
|
|
|
|
sk->sk_err = err;
|
|
sk->sk_error_report(sk);
|
|
}
|
|
|
|
struct sk_psock *sk_psock_init(struct sock *sk, int node);
|
|
|
|
int sk_psock_init_strp(struct sock *sk, struct sk_psock *psock);
|
|
void sk_psock_start_strp(struct sock *sk, struct sk_psock *psock);
|
|
void sk_psock_stop_strp(struct sock *sk, struct sk_psock *psock);
|
|
|
|
int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock,
|
|
struct sk_msg *msg);
|
|
|
|
static inline struct sk_psock_link *sk_psock_init_link(void)
|
|
{
|
|
return kzalloc(sizeof(struct sk_psock_link),
|
|
GFP_ATOMIC | __GFP_NOWARN);
|
|
}
|
|
|
|
static inline void sk_psock_free_link(struct sk_psock_link *link)
|
|
{
|
|
kfree(link);
|
|
}
|
|
|
|
struct sk_psock_link *sk_psock_link_pop(struct sk_psock *psock);
|
|
#if defined(CONFIG_BPF_STREAM_PARSER)
|
|
void sk_psock_unlink(struct sock *sk, struct sk_psock_link *link);
|
|
#else
|
|
static inline void sk_psock_unlink(struct sock *sk,
|
|
struct sk_psock_link *link)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
void __sk_psock_purge_ingress_msg(struct sk_psock *psock);
|
|
|
|
static inline void sk_psock_cork_free(struct sk_psock *psock)
|
|
{
|
|
if (psock->cork) {
|
|
sk_msg_free(psock->sk, psock->cork);
|
|
kfree(psock->cork);
|
|
psock->cork = NULL;
|
|
}
|
|
}
|
|
|
|
static inline void sk_psock_update_proto(struct sock *sk,
|
|
struct sk_psock *psock,
|
|
struct proto *ops)
|
|
{
|
|
psock->saved_unhash = sk->sk_prot->unhash;
|
|
psock->saved_close = sk->sk_prot->close;
|
|
psock->saved_write_space = sk->sk_write_space;
|
|
|
|
psock->sk_proto = sk->sk_prot;
|
|
sk->sk_prot = ops;
|
|
}
|
|
|
|
static inline void sk_psock_restore_proto(struct sock *sk,
|
|
struct sk_psock *psock)
|
|
{
|
|
sk->sk_write_space = psock->saved_write_space;
|
|
|
|
if (psock->sk_proto) {
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
bool has_ulp = !!icsk->icsk_ulp_data;
|
|
|
|
if (has_ulp)
|
|
tcp_update_ulp(sk, psock->sk_proto);
|
|
else
|
|
sk->sk_prot = psock->sk_proto;
|
|
psock->sk_proto = NULL;
|
|
}
|
|
}
|
|
|
|
static inline void sk_psock_set_state(struct sk_psock *psock,
|
|
enum sk_psock_state_bits bit)
|
|
{
|
|
set_bit(bit, &psock->state);
|
|
}
|
|
|
|
static inline void sk_psock_clear_state(struct sk_psock *psock,
|
|
enum sk_psock_state_bits bit)
|
|
{
|
|
clear_bit(bit, &psock->state);
|
|
}
|
|
|
|
static inline bool sk_psock_test_state(const struct sk_psock *psock,
|
|
enum sk_psock_state_bits bit)
|
|
{
|
|
return test_bit(bit, &psock->state);
|
|
}
|
|
|
|
static inline struct sk_psock *sk_psock_get_checked(struct sock *sk)
|
|
{
|
|
struct sk_psock *psock;
|
|
|
|
rcu_read_lock();
|
|
psock = sk_psock(sk);
|
|
if (psock) {
|
|
if (sk->sk_prot->recvmsg != tcp_bpf_recvmsg) {
|
|
psock = ERR_PTR(-EBUSY);
|
|
goto out;
|
|
}
|
|
|
|
if (!refcount_inc_not_zero(&psock->refcnt))
|
|
psock = ERR_PTR(-EBUSY);
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
return psock;
|
|
}
|
|
|
|
static inline struct sk_psock *sk_psock_get(struct sock *sk)
|
|
{
|
|
struct sk_psock *psock;
|
|
|
|
rcu_read_lock();
|
|
psock = sk_psock(sk);
|
|
if (psock && !refcount_inc_not_zero(&psock->refcnt))
|
|
psock = NULL;
|
|
rcu_read_unlock();
|
|
return psock;
|
|
}
|
|
|
|
void sk_psock_stop(struct sock *sk, struct sk_psock *psock);
|
|
void sk_psock_destroy(struct rcu_head *rcu);
|
|
void sk_psock_drop(struct sock *sk, struct sk_psock *psock);
|
|
|
|
static inline void sk_psock_put(struct sock *sk, struct sk_psock *psock)
|
|
{
|
|
if (refcount_dec_and_test(&psock->refcnt))
|
|
sk_psock_drop(sk, psock);
|
|
}
|
|
|
|
static inline void sk_psock_data_ready(struct sock *sk, struct sk_psock *psock)
|
|
{
|
|
if (psock->parser.enabled)
|
|
psock->parser.saved_data_ready(sk);
|
|
else
|
|
sk->sk_data_ready(sk);
|
|
}
|
|
|
|
static inline void psock_set_prog(struct bpf_prog **pprog,
|
|
struct bpf_prog *prog)
|
|
{
|
|
prog = xchg(pprog, prog);
|
|
if (prog)
|
|
bpf_prog_put(prog);
|
|
}
|
|
|
|
static inline void psock_progs_drop(struct sk_psock_progs *progs)
|
|
{
|
|
psock_set_prog(&progs->msg_parser, NULL);
|
|
psock_set_prog(&progs->skb_parser, NULL);
|
|
psock_set_prog(&progs->skb_verdict, NULL);
|
|
}
|
|
|
|
#endif /* _LINUX_SKMSG_H */
|