547 lines
13 KiB
C
547 lines
13 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
|
|
#define NR_MSG_FRAG_IDS (MAX_MSG_FRAGS + 1)
|
|
|
|
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;
|
|
unsigned long copy;
|
|
/* The extra two elements:
|
|
* 1) used for chaining the front and sections when the list becomes
|
|
* partitioned (e.g. end < start). The crypto APIs require the
|
|
* chaining;
|
|
* 2) to chain tailer SG entries after the message.
|
|
*/
|
|
struct scatterlist data[MAX_MSG_FRAGS + 2];
|
|
};
|
|
static_assert(BITS_PER_LONG >= NR_MSG_FRAG_IDS);
|
|
|
|
/* 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 *stream_parser;
|
|
struct bpf_prog *stream_verdict;
|
|
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_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;
|
|
#if IS_ENABLED(CONFIG_BPF_STREAM_PARSER)
|
|
struct strparser strp;
|
|
#endif
|
|
struct sk_buff_head ingress_skb;
|
|
struct list_head ingress_msg;
|
|
spinlock_t ingress_lock;
|
|
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);
|
|
void (*saved_data_ready)(struct sock *sk);
|
|
int (*psock_update_sk_prot)(struct sock *sk, struct sk_psock *psock,
|
|
bool restore);
|
|
struct proto *sk_proto;
|
|
struct mutex work_mutex;
|
|
struct sk_psock_work_state work_state;
|
|
struct work_struct work;
|
|
struct rcu_work rwork;
|
|
};
|
|
|
|
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);
|
|
int sk_msg_recvmsg(struct sock *sk, struct sk_psock *psock, struct msghdr *msg,
|
|
int len, int flags);
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
static inline u32 sk_msg_iter_dist(u32 start, u32 end)
|
|
{
|
|
return end >= start ? end - start : end + (NR_MSG_FRAG_IDS - start);
|
|
}
|
|
|
|
#define sk_msg_iter_var_prev(var) \
|
|
do { \
|
|
if (var == 0) \
|
|
var = NR_MSG_FRAG_IDS - 1; \
|
|
else \
|
|
var--; \
|
|
} while (0)
|
|
|
|
#define sk_msg_iter_var_next(var) \
|
|
do { \
|
|
var++; \
|
|
if (var == NR_MSG_FRAG_IDS) \
|
|
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 != NR_MSG_FRAG_IDS);
|
|
memset(msg, 0, sizeof(*msg));
|
|
sg_init_marker(msg->sg.data, NR_MSG_FRAG_IDS);
|
|
}
|
|
|
|
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.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 sk_msg_iter_dist(msg->sg.start, msg->sg.end) == MAX_MSG_FRAGS;
|
|
}
|
|
|
|
static inline u32 sk_msg_elem_used(const struct sk_msg *msg)
|
|
{
|
|
return sk_msg_iter_dist(msg->sg.start, msg->sg.end);
|
|
}
|
|
|
|
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 (test_bit(msg->sg.start, &msg->sg.copy)) {
|
|
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);
|
|
|
|
__set_bit(msg->sg.end, &msg->sg.copy);
|
|
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 {
|
|
if (copy_state)
|
|
__set_bit(i, &msg->sg.copy);
|
|
else
|
|
__clear_bit(i, &msg->sg.copy);
|
|
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_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 void sock_drop(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
sk_drops_add(sk, skb);
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
static inline void drop_sk_msg(struct sk_psock *psock, struct sk_msg *msg)
|
|
{
|
|
if (msg->skb)
|
|
sock_drop(psock->sk, msg->skb);
|
|
kfree(msg);
|
|
}
|
|
|
|
static inline void sk_psock_queue_msg(struct sk_psock *psock,
|
|
struct sk_msg *msg)
|
|
{
|
|
spin_lock_bh(&psock->ingress_lock);
|
|
if (sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED))
|
|
list_add_tail(&msg->list, &psock->ingress_msg);
|
|
else
|
|
drop_sk_msg(psock, msg);
|
|
spin_unlock_bh(&psock->ingress_lock);
|
|
}
|
|
|
|
static inline struct sk_msg *sk_psock_dequeue_msg(struct sk_psock *psock)
|
|
{
|
|
struct sk_msg *msg;
|
|
|
|
spin_lock_bh(&psock->ingress_lock);
|
|
msg = list_first_entry_or_null(&psock->ingress_msg, struct sk_msg, list);
|
|
if (msg)
|
|
list_del(&msg->list);
|
|
spin_unlock_bh(&psock->ingress_lock);
|
|
return msg;
|
|
}
|
|
|
|
static inline struct sk_msg *sk_psock_peek_msg(struct sk_psock *psock)
|
|
{
|
|
struct sk_msg *msg;
|
|
|
|
spin_lock_bh(&psock->ingress_lock);
|
|
msg = list_first_entry_or_null(&psock->ingress_msg, struct sk_msg, list);
|
|
spin_unlock_bh(&psock->ingress_lock);
|
|
return msg;
|
|
}
|
|
|
|
static inline struct sk_msg *sk_psock_next_msg(struct sk_psock *psock,
|
|
struct sk_msg *msg)
|
|
{
|
|
struct sk_msg *ret;
|
|
|
|
spin_lock_bh(&psock->ingress_lock);
|
|
if (list_is_last(&msg->list, &psock->ingress_msg))
|
|
ret = NULL;
|
|
else
|
|
ret = list_next_entry(msg, list);
|
|
spin_unlock_bh(&psock->ingress_lock);
|
|
return ret;
|
|
}
|
|
|
|
static inline bool sk_psock_queue_empty(const struct sk_psock *psock)
|
|
{
|
|
return psock ? list_empty(&psock->ingress_msg) : true;
|
|
}
|
|
|
|
static inline void kfree_sk_msg(struct sk_msg *msg)
|
|
{
|
|
if (msg->skb)
|
|
consume_skb(msg->skb);
|
|
kfree(msg);
|
|
}
|
|
|
|
static inline void sk_psock_report_error(struct sk_psock *psock, int err)
|
|
{
|
|
struct sock *sk = psock->sk;
|
|
|
|
sk->sk_err = err;
|
|
sk_error_report(sk);
|
|
}
|
|
|
|
struct sk_psock *sk_psock_init(struct sock *sk, int node);
|
|
void sk_psock_stop(struct sk_psock *psock, bool wait);
|
|
|
|
#if IS_ENABLED(CONFIG_BPF_STREAM_PARSER)
|
|
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);
|
|
#else
|
|
static inline int sk_psock_init_strp(struct sock *sk, struct sk_psock *psock)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline void sk_psock_start_strp(struct sock *sk, struct sk_psock *psock)
|
|
{
|
|
}
|
|
|
|
static inline void sk_psock_stop_strp(struct sock *sk, struct sk_psock *psock)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
void sk_psock_start_verdict(struct sock *sk, struct sk_psock *psock);
|
|
void sk_psock_stop_verdict(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);
|
|
|
|
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_restore_proto(struct sock *sk,
|
|
struct sk_psock *psock)
|
|
{
|
|
if (psock->psock_update_sk_prot)
|
|
psock->psock_update_sk_prot(sk, psock, true);
|
|
}
|
|
|
|
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_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->saved_data_ready)
|
|
psock->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 int psock_replace_prog(struct bpf_prog **pprog,
|
|
struct bpf_prog *prog,
|
|
struct bpf_prog *old)
|
|
{
|
|
if (cmpxchg(pprog, old, prog) != old)
|
|
return -ENOENT;
|
|
|
|
if (old)
|
|
bpf_prog_put(old);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void psock_progs_drop(struct sk_psock_progs *progs)
|
|
{
|
|
psock_set_prog(&progs->msg_parser, NULL);
|
|
psock_set_prog(&progs->stream_parser, NULL);
|
|
psock_set_prog(&progs->stream_verdict, NULL);
|
|
psock_set_prog(&progs->skb_verdict, NULL);
|
|
}
|
|
|
|
int sk_psock_tls_strp_read(struct sk_psock *psock, struct sk_buff *skb);
|
|
|
|
static inline bool sk_psock_strp_enabled(struct sk_psock *psock)
|
|
{
|
|
if (!psock)
|
|
return false;
|
|
return !!psock->saved_data_ready;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NET_SOCK_MSG)
|
|
|
|
/* We only have one bit so far. */
|
|
#define BPF_F_PTR_MASK ~(BPF_F_INGRESS)
|
|
|
|
static inline bool skb_bpf_ingress(const struct sk_buff *skb)
|
|
{
|
|
unsigned long sk_redir = skb->_sk_redir;
|
|
|
|
return sk_redir & BPF_F_INGRESS;
|
|
}
|
|
|
|
static inline void skb_bpf_set_ingress(struct sk_buff *skb)
|
|
{
|
|
skb->_sk_redir |= BPF_F_INGRESS;
|
|
}
|
|
|
|
static inline void skb_bpf_set_redir(struct sk_buff *skb, struct sock *sk_redir,
|
|
bool ingress)
|
|
{
|
|
skb->_sk_redir = (unsigned long)sk_redir;
|
|
if (ingress)
|
|
skb->_sk_redir |= BPF_F_INGRESS;
|
|
}
|
|
|
|
static inline struct sock *skb_bpf_redirect_fetch(const struct sk_buff *skb)
|
|
{
|
|
unsigned long sk_redir = skb->_sk_redir;
|
|
|
|
return (struct sock *)(sk_redir & BPF_F_PTR_MASK);
|
|
}
|
|
|
|
static inline void skb_bpf_redirect_clear(struct sk_buff *skb)
|
|
{
|
|
skb->_sk_redir = 0;
|
|
}
|
|
#endif /* CONFIG_NET_SOCK_MSG */
|
|
#endif /* _LINUX_SKMSG_H */
|