projects/linux·blob master · refs

201 lines · 5.1 KiB

1// SPDX-License-Identifier: GPL-2.0
2#include <asm/ioctls.h>
3#include <linux/io_uring/net.h>
4#include <linux/errqueue.h>
5#include <net/sock.h>
6
7#include "uring_cmd.h"
8#include "io_uring.h"
9
10static int io_uring_cmd_get_sock_ioctl(struct socket *sock, int op)
11{
12 struct sock *sk = sock->sk;
13 struct proto *prot = READ_ONCE(sk->sk_prot);
14 int ret, arg = 0;
15
16 if (!prot || !prot->ioctl)
17 return -EOPNOTSUPP;
18
19 ret = prot->ioctl(sk, op, &arg);
20 if (ret)
21 return ret;
22 return arg;
23}
24
25static inline int io_uring_cmd_getsockopt(struct socket *sock,
26 struct io_uring_cmd *cmd,
27 unsigned int issue_flags)
28{
29 const struct io_uring_sqe *sqe = cmd->sqe;
30 bool compat = !!(issue_flags & IO_URING_F_COMPAT);
31 int optlen, optname, level, err;
32 void __user *optval;
33
34 level = READ_ONCE(sqe->level);
35 if (level != SOL_SOCKET)
36 return -EOPNOTSUPP;
37
38 optval = u64_to_user_ptr(READ_ONCE(sqe->optval));
39 optname = READ_ONCE(sqe->optname);
40 optlen = READ_ONCE(sqe->optlen);
41
42 err = do_sock_getsockopt(sock, compat, level, optname,
43 USER_SOCKPTR(optval),
44 KERNEL_SOCKPTR(&optlen));
45 if (err)
46 return err;
47
48 /* On success, return optlen */
49 return optlen;
50}
51
52static inline int io_uring_cmd_setsockopt(struct socket *sock,
53 struct io_uring_cmd *cmd,
54 unsigned int issue_flags)
55{
56 const struct io_uring_sqe *sqe = cmd->sqe;
57 bool compat = !!(issue_flags & IO_URING_F_COMPAT);
58 int optname, optlen, level;
59 void __user *optval;
60 sockptr_t optval_s;
61
62 optval = u64_to_user_ptr(READ_ONCE(sqe->optval));
63 optname = READ_ONCE(sqe->optname);
64 optlen = READ_ONCE(sqe->optlen);
65 level = READ_ONCE(sqe->level);
66 optval_s = USER_SOCKPTR(optval);
67
68 return do_sock_setsockopt(sock, compat, level, optname, optval_s,
69 optlen);
70}
71
72static int io_process_timestamp_skb(struct io_uring_cmd *cmd, struct sock *sk,
73 struct sk_buff *skb, unsigned int issue_flags)
74{
75 struct sock_exterr_skb *serr = SKB_EXT_ERR(skb);
76 struct io_uring_cqe cqe[2];
77 struct io_timespec *iots;
78 struct timespec64 ts;
79 u32 tstype, tskey;
80 int ret;
81
82 BUILD_BUG_ON(sizeof(struct io_uring_cqe) != sizeof(struct io_timespec));
83
84 ret = skb_get_tx_timestamp(skb, sk, &ts);
85 if (ret < 0)
86 return ret;
87
88 tskey = serr->ee.ee_data;
89 tstype = serr->ee.ee_info;
90
91 cqe->user_data = 0;
92 cqe->res = tskey;
93 cqe->flags = IORING_CQE_F_MORE | ctx_cqe32_flags(cmd_to_io_kiocb(cmd)->ctx);
94 cqe->flags |= tstype << IORING_TIMESTAMP_TYPE_SHIFT;
95 if (ret == SOF_TIMESTAMPING_TX_HARDWARE)
96 cqe->flags |= IORING_CQE_F_TSTAMP_HW;
97
98 iots = (struct io_timespec *)&cqe[1];
99 iots->tv_sec = ts.tv_sec;
100 iots->tv_nsec = ts.tv_nsec;
101 if (!io_uring_cmd_post_mshot_cqe32(cmd, issue_flags, cqe))
102 return -ENOBUFS;
103 return 0;
104}
105
106static int io_uring_cmd_timestamp(struct socket *sock,
107 struct io_uring_cmd *cmd,
108 unsigned int issue_flags)
109{
110 struct sock *sk = sock->sk;
111 struct sk_buff_head *q = &sk->sk_error_queue;
112 struct sk_buff *skb, *tmp;
113 struct sk_buff_head list;
114 int ret;
115
116 if (!(issue_flags & IO_URING_F_CQE32))
117 return -EINVAL;
118 ret = io_cmd_poll_multishot(cmd, issue_flags, EPOLLERR);
119 if (unlikely(ret))
120 return ret;
121
122 if (skb_queue_empty_lockless(q))
123 return -EAGAIN;
124 __skb_queue_head_init(&list);
125
126 scoped_guard(spinlock_irq, &q->lock) {
127 skb_queue_walk_safe(q, skb, tmp) {
128 /* don't support skbs with payload */
129 if (!skb_has_tx_timestamp(skb, sk) || skb->len)
130 continue;
131 __skb_unlink(skb, q);
132 __skb_queue_tail(&list, skb);
133 }
134 }
135
136 while (1) {
137 skb = skb_peek(&list);
138 if (!skb)
139 break;
140 ret = io_process_timestamp_skb(cmd, sk, skb, issue_flags);
141 if (ret)
142 break;
143 __skb_dequeue(&list);
144 consume_skb(skb);
145 }
146
147 if (!unlikely(skb_queue_empty(&list))) {
148 scoped_guard(spinlock_irqsave, &q->lock)
149 skb_queue_splice(&list, q);
150 }
151 /*
152 * Aux CQEs cannot overflow and the poll is edge triggered, so nothing
153 * re-runs the command once the CQ drains. End the multishot instead.
154 */
155 if (ret == -ENOBUFS)
156 return -ENOBUFS;
157 return -EAGAIN;
158}
159
160static int io_uring_cmd_getsockname(struct socket *sock,
161 struct io_uring_cmd *cmd,
162 unsigned int issue_flags)
163{
164 const struct io_uring_sqe *sqe = cmd->sqe;
165 struct sockaddr __user *uaddr;
166 unsigned int peer;
167 int __user *ulen;
168
169 if (sqe->ioprio || sqe->__pad1 || sqe->len || sqe->rw_flags)
170 return -EINVAL;
171
172 uaddr = u64_to_user_ptr(READ_ONCE(sqe->addr));
173 ulen = u64_to_user_ptr(READ_ONCE(sqe->addr3));
174 peer = READ_ONCE(sqe->optlen);
175 if (peer > 1)
176 return -EINVAL;
177 return do_getsockname(sock, peer, uaddr, ulen);
178}
179
180int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
181{
182 struct socket *sock = cmd->file->private_data;
183
184 switch (cmd->cmd_op) {
185 case SOCKET_URING_OP_SIOCINQ:
186 return io_uring_cmd_get_sock_ioctl(sock, SIOCINQ);
187 case SOCKET_URING_OP_SIOCOUTQ:
188 return io_uring_cmd_get_sock_ioctl(sock, SIOCOUTQ);
189 case SOCKET_URING_OP_GETSOCKOPT:
190 return io_uring_cmd_getsockopt(sock, cmd, issue_flags);
191 case SOCKET_URING_OP_SETSOCKOPT:
192 return io_uring_cmd_setsockopt(sock, cmd, issue_flags);
193 case SOCKET_URING_OP_TX_TIMESTAMP:
194 return io_uring_cmd_timestamp(sock, cmd, issue_flags);
195 case SOCKET_URING_OP_GETSOCKNAME:
196 return io_uring_cmd_getsockname(sock, cmd, issue_flags);
197 default:
198 return -EOPNOTSUPP;
199 }
200}
201EXPORT_SYMBOL_GPL(io_uring_cmd_sock);