464 lines
11 KiB
C
464 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2017 - 2018 Covalent IO, Inc. http://covalent.io */
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#ifndef _LINUX_SKMSG_H
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#define _LINUX_SKMSG_H
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#include <linux/bpf.h>
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#include <linux/filter.h>
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#include <linux/scatterlist.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <net/strparser.h>
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#define MAX_MSG_FRAGS MAX_SKB_FRAGS
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#define NR_MSG_FRAG_IDS (MAX_MSG_FRAGS + 1)
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enum __sk_action {
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__SK_DROP = 0,
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__SK_PASS,
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__SK_REDIRECT,
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__SK_NONE,
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};
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struct sk_msg_sg {
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u32 start;
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u32 curr;
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u32 end;
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u32 size;
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u32 copybreak;
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unsigned long copy;
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/* The extra two elements:
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* 1) used for chaining the front and sections when the list becomes
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* partitioned (e.g. end < start). The crypto APIs require the
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* chaining;
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* 2) to chain tailer SG entries after the message.
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*/
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struct scatterlist data[MAX_MSG_FRAGS + 2];
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};
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static_assert(BITS_PER_LONG >= NR_MSG_FRAG_IDS);
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/* UAPI in filter.c depends on struct sk_msg_sg being first element. */
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struct sk_msg {
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struct sk_msg_sg sg;
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void *data;
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void *data_end;
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u32 apply_bytes;
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u32 cork_bytes;
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u32 flags;
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struct sk_buff *skb;
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struct sock *sk_redir;
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struct sock *sk;
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struct list_head list;
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};
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struct sk_psock_progs {
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struct bpf_prog *msg_parser;
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struct bpf_prog *skb_parser;
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struct bpf_prog *skb_verdict;
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};
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enum sk_psock_state_bits {
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SK_PSOCK_TX_ENABLED,
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};
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struct sk_psock_link {
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struct list_head list;
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struct bpf_map *map;
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void *link_raw;
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};
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struct sk_psock_parser {
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struct strparser strp;
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bool enabled;
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void (*saved_data_ready)(struct sock *sk);
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};
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struct sk_psock_work_state {
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struct sk_buff *skb;
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u32 len;
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u32 off;
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};
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struct sk_psock {
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struct sock *sk;
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struct sock *sk_redir;
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u32 apply_bytes;
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u32 cork_bytes;
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u32 eval;
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struct sk_msg *cork;
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struct sk_psock_progs progs;
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struct sk_psock_parser parser;
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struct sk_buff_head ingress_skb;
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struct list_head ingress_msg;
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unsigned long state;
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struct list_head link;
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spinlock_t link_lock;
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refcount_t refcnt;
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void (*saved_unhash)(struct sock *sk);
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void (*saved_close)(struct sock *sk, long timeout);
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void (*saved_write_space)(struct sock *sk);
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struct proto *sk_proto;
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struct sk_psock_work_state work_state;
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struct work_struct work;
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union {
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struct rcu_head rcu;
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struct work_struct gc;
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};
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};
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int sk_msg_alloc(struct sock *sk, struct sk_msg *msg, int len,
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int elem_first_coalesce);
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int sk_msg_clone(struct sock *sk, struct sk_msg *dst, struct sk_msg *src,
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u32 off, u32 len);
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void sk_msg_trim(struct sock *sk, struct sk_msg *msg, int len);
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int sk_msg_free(struct sock *sk, struct sk_msg *msg);
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int sk_msg_free_nocharge(struct sock *sk, struct sk_msg *msg);
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void sk_msg_free_partial(struct sock *sk, struct sk_msg *msg, u32 bytes);
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void sk_msg_free_partial_nocharge(struct sock *sk, struct sk_msg *msg,
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u32 bytes);
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void sk_msg_return(struct sock *sk, struct sk_msg *msg, int bytes);
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void sk_msg_return_zero(struct sock *sk, struct sk_msg *msg, int bytes);
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int sk_msg_zerocopy_from_iter(struct sock *sk, struct iov_iter *from,
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struct sk_msg *msg, u32 bytes);
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int sk_msg_memcopy_from_iter(struct sock *sk, struct iov_iter *from,
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struct sk_msg *msg, u32 bytes);
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static inline void sk_msg_check_to_free(struct sk_msg *msg, u32 i, u32 bytes)
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{
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WARN_ON(i == msg->sg.end && bytes);
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}
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static inline void sk_msg_apply_bytes(struct sk_psock *psock, u32 bytes)
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{
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if (psock->apply_bytes) {
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if (psock->apply_bytes < bytes)
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psock->apply_bytes = 0;
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else
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psock->apply_bytes -= bytes;
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}
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}
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static inline u32 sk_msg_iter_dist(u32 start, u32 end)
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{
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return end >= start ? end - start : end + (NR_MSG_FRAG_IDS - start);
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}
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#define sk_msg_iter_var_prev(var) \
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do { \
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if (var == 0) \
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var = NR_MSG_FRAG_IDS - 1; \
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else \
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var--; \
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} while (0)
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#define sk_msg_iter_var_next(var) \
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do { \
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var++; \
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if (var == NR_MSG_FRAG_IDS) \
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var = 0; \
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} while (0)
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#define sk_msg_iter_prev(msg, which) \
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sk_msg_iter_var_prev(msg->sg.which)
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#define sk_msg_iter_next(msg, which) \
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sk_msg_iter_var_next(msg->sg.which)
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static inline void sk_msg_clear_meta(struct sk_msg *msg)
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{
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memset(&msg->sg, 0, offsetofend(struct sk_msg_sg, copy));
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}
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static inline void sk_msg_init(struct sk_msg *msg)
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{
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BUILD_BUG_ON(ARRAY_SIZE(msg->sg.data) - 1 != NR_MSG_FRAG_IDS);
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memset(msg, 0, sizeof(*msg));
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sg_init_marker(msg->sg.data, NR_MSG_FRAG_IDS);
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}
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static inline void sk_msg_xfer(struct sk_msg *dst, struct sk_msg *src,
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int which, u32 size)
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{
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dst->sg.data[which] = src->sg.data[which];
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dst->sg.data[which].length = size;
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dst->sg.size += size;
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src->sg.data[which].length -= size;
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src->sg.data[which].offset += size;
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}
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static inline void sk_msg_xfer_full(struct sk_msg *dst, struct sk_msg *src)
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{
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memcpy(dst, src, sizeof(*src));
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sk_msg_init(src);
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}
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static inline bool sk_msg_full(const struct sk_msg *msg)
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{
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return sk_msg_iter_dist(msg->sg.start, msg->sg.end) == MAX_MSG_FRAGS;
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}
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static inline u32 sk_msg_elem_used(const struct sk_msg *msg)
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{
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return sk_msg_iter_dist(msg->sg.start, msg->sg.end);
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}
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static inline struct scatterlist *sk_msg_elem(struct sk_msg *msg, int which)
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{
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return &msg->sg.data[which];
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}
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static inline struct scatterlist sk_msg_elem_cpy(struct sk_msg *msg, int which)
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{
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return msg->sg.data[which];
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}
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static inline struct page *sk_msg_page(struct sk_msg *msg, int which)
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{
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return sg_page(sk_msg_elem(msg, which));
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}
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static inline bool sk_msg_to_ingress(const struct sk_msg *msg)
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{
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return msg->flags & BPF_F_INGRESS;
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}
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static inline void sk_msg_compute_data_pointers(struct sk_msg *msg)
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{
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struct scatterlist *sge = sk_msg_elem(msg, msg->sg.start);
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if (test_bit(msg->sg.start, &msg->sg.copy)) {
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msg->data = NULL;
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msg->data_end = NULL;
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} else {
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msg->data = sg_virt(sge);
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msg->data_end = msg->data + sge->length;
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}
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}
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static inline void sk_msg_page_add(struct sk_msg *msg, struct page *page,
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u32 len, u32 offset)
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{
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struct scatterlist *sge;
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get_page(page);
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sge = sk_msg_elem(msg, msg->sg.end);
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sg_set_page(sge, page, len, offset);
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sg_unmark_end(sge);
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__set_bit(msg->sg.end, &msg->sg.copy);
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msg->sg.size += len;
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sk_msg_iter_next(msg, end);
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}
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static inline void sk_msg_sg_copy(struct sk_msg *msg, u32 i, bool copy_state)
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{
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do {
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if (copy_state)
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__set_bit(i, &msg->sg.copy);
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else
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__clear_bit(i, &msg->sg.copy);
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sk_msg_iter_var_next(i);
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if (i == msg->sg.end)
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break;
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} while (1);
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}
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static inline void sk_msg_sg_copy_set(struct sk_msg *msg, u32 start)
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{
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sk_msg_sg_copy(msg, start, true);
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}
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static inline void sk_msg_sg_copy_clear(struct sk_msg *msg, u32 start)
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{
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sk_msg_sg_copy(msg, start, false);
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}
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static inline struct sk_psock *sk_psock(const struct sock *sk)
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{
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return rcu_dereference_sk_user_data(sk);
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}
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static inline void sk_psock_queue_msg(struct sk_psock *psock,
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struct sk_msg *msg)
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{
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list_add_tail(&msg->list, &psock->ingress_msg);
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}
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static inline bool sk_psock_queue_empty(const struct sk_psock *psock)
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{
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return psock ? list_empty(&psock->ingress_msg) : true;
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}
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static inline void sk_psock_report_error(struct sk_psock *psock, int err)
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{
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struct sock *sk = psock->sk;
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sk->sk_err = err;
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sk->sk_error_report(sk);
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}
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struct sk_psock *sk_psock_init(struct sock *sk, int node);
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int sk_psock_init_strp(struct sock *sk, struct sk_psock *psock);
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void sk_psock_start_strp(struct sock *sk, struct sk_psock *psock);
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void sk_psock_stop_strp(struct sock *sk, struct sk_psock *psock);
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int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock,
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struct sk_msg *msg);
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static inline struct sk_psock_link *sk_psock_init_link(void)
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{
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return kzalloc(sizeof(struct sk_psock_link),
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GFP_ATOMIC | __GFP_NOWARN);
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}
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static inline void sk_psock_free_link(struct sk_psock_link *link)
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{
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kfree(link);
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}
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struct sk_psock_link *sk_psock_link_pop(struct sk_psock *psock);
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#if defined(CONFIG_BPF_STREAM_PARSER)
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void sk_psock_unlink(struct sock *sk, struct sk_psock_link *link);
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#else
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static inline void sk_psock_unlink(struct sock *sk,
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struct sk_psock_link *link)
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{
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}
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#endif
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void __sk_psock_purge_ingress_msg(struct sk_psock *psock);
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static inline void sk_psock_cork_free(struct sk_psock *psock)
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{
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if (psock->cork) {
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sk_msg_free(psock->sk, psock->cork);
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kfree(psock->cork);
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psock->cork = NULL;
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}
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}
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static inline void sk_psock_update_proto(struct sock *sk,
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struct sk_psock *psock,
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struct proto *ops)
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{
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psock->saved_unhash = sk->sk_prot->unhash;
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psock->saved_close = sk->sk_prot->close;
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psock->saved_write_space = sk->sk_write_space;
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psock->sk_proto = sk->sk_prot;
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sk->sk_prot = ops;
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}
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static inline void sk_psock_restore_proto(struct sock *sk,
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struct sk_psock *psock)
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{
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sk->sk_prot->unhash = psock->saved_unhash;
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if (psock->sk_proto) {
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struct inet_connection_sock *icsk = inet_csk(sk);
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bool has_ulp = !!icsk->icsk_ulp_data;
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if (has_ulp) {
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tcp_update_ulp(sk, psock->sk_proto,
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psock->saved_write_space);
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} else {
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sk->sk_prot = psock->sk_proto;
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sk->sk_write_space = psock->saved_write_space;
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}
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psock->sk_proto = NULL;
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} else {
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sk->sk_write_space = psock->saved_write_space;
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}
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}
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static inline void sk_psock_set_state(struct sk_psock *psock,
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enum sk_psock_state_bits bit)
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{
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set_bit(bit, &psock->state);
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}
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static inline void sk_psock_clear_state(struct sk_psock *psock,
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enum sk_psock_state_bits bit)
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{
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clear_bit(bit, &psock->state);
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}
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static inline bool sk_psock_test_state(const struct sk_psock *psock,
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enum sk_psock_state_bits bit)
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{
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return test_bit(bit, &psock->state);
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}
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static inline struct sk_psock *sk_psock_get_checked(struct sock *sk)
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{
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struct sk_psock *psock;
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rcu_read_lock();
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psock = sk_psock(sk);
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if (psock) {
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if (sk->sk_prot->recvmsg != tcp_bpf_recvmsg) {
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psock = ERR_PTR(-EBUSY);
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goto out;
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}
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if (!refcount_inc_not_zero(&psock->refcnt))
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psock = ERR_PTR(-EBUSY);
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}
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out:
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rcu_read_unlock();
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return psock;
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}
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static inline struct sk_psock *sk_psock_get(struct sock *sk)
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{
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struct sk_psock *psock;
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rcu_read_lock();
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psock = sk_psock(sk);
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if (psock && !refcount_inc_not_zero(&psock->refcnt))
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psock = NULL;
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rcu_read_unlock();
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return psock;
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}
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void sk_psock_stop(struct sock *sk, struct sk_psock *psock);
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void sk_psock_destroy(struct rcu_head *rcu);
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void sk_psock_drop(struct sock *sk, struct sk_psock *psock);
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static inline void sk_psock_put(struct sock *sk, struct sk_psock *psock)
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{
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if (refcount_dec_and_test(&psock->refcnt))
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sk_psock_drop(sk, psock);
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}
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static inline void sk_psock_data_ready(struct sock *sk, struct sk_psock *psock)
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{
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if (psock->parser.enabled)
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psock->parser.saved_data_ready(sk);
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else
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sk->sk_data_ready(sk);
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}
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static inline void psock_set_prog(struct bpf_prog **pprog,
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struct bpf_prog *prog)
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{
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prog = xchg(pprog, prog);
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if (prog)
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bpf_prog_put(prog);
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}
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static inline void psock_progs_drop(struct sk_psock_progs *progs)
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{
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psock_set_prog(&progs->msg_parser, NULL);
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psock_set_prog(&progs->skb_parser, NULL);
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psock_set_prog(&progs->skb_verdict, NULL);
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}
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#endif /* _LINUX_SKMSG_H */
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