summaryrefslogtreecommitdiff
path: root/net/xdp/xsk_diag.c
blob: 661d007c3b2887223ecf417e1fb6f970b50146e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
// SPDX-License-Identifier: GPL-2.0
/* XDP sockets monitoring support
 *
 * Copyright(c) 2019 Intel Corporation.
 *
 * Author: Björn Töpel <bjorn.topel@intel.com>
 */

#include <linux/module.h>
#include <net/xdp_sock.h>
#include <linux/xdp_diag.h>
#include <linux/sock_diag.h>

#include "xsk_queue.h"
#include "xsk.h"

static int xsk_diag_put_info(const struct xdp_sock *xs, struct sk_buff *nlskb)
{
	struct xdp_diag_info di = {};

	di.ifindex = xs->dev ? xs->dev->ifindex : 0;
	di.queue_id = xs->queue_id;
	return nla_put(nlskb, XDP_DIAG_INFO, sizeof(di), &di);
}

static int xsk_diag_put_ring(const struct xsk_queue *queue, int nl_type,
			     struct sk_buff *nlskb)
{
	struct xdp_diag_ring dr = {};

	dr.entries = queue->nentries;
	return nla_put(nlskb, nl_type, sizeof(dr), &dr);
}

static int xsk_diag_put_rings_cfg(const struct xdp_sock *xs,
				  struct sk_buff *nlskb)
{
	int err = 0;

	if (xs->rx)
		err = xsk_diag_put_ring(xs->rx, XDP_DIAG_RX_RING, nlskb);
	if (!err && xs->tx)
		err = xsk_diag_put_ring(xs->tx, XDP_DIAG_TX_RING, nlskb);
	return err;
}

static int xsk_diag_put_umem(const struct xdp_sock *xs, struct sk_buff *nlskb)
{
	struct xdp_umem *umem = xs->umem;
	struct xdp_diag_umem du = {};
	int err;

	if (!umem)
		return 0;

	du.id = umem->id;
	du.size = umem->size;
	du.num_pages = umem->npgs;
	du.chunk_size = (__u32)(~umem->chunk_mask + 1);
	du.headroom = umem->headroom;
	du.ifindex = umem->dev ? umem->dev->ifindex : 0;
	du.queue_id = umem->queue_id;
	du.flags = 0;
	if (umem->zc)
		du.flags |= XDP_DU_F_ZEROCOPY;
	du.refs = refcount_read(&umem->users);

	err = nla_put(nlskb, XDP_DIAG_UMEM, sizeof(du), &du);

	if (!err && umem->fq)
		err = xsk_diag_put_ring(xs->tx, XDP_DIAG_UMEM_FILL_RING, nlskb);
	if (!err && umem->cq) {
		err = xsk_diag_put_ring(xs->tx, XDP_DIAG_UMEM_COMPLETION_RING,
					nlskb);
	}
	return err;
}

static int xsk_diag_fill(struct sock *sk, struct sk_buff *nlskb,
			 struct xdp_diag_req *req,
			 struct user_namespace *user_ns,
			 u32 portid, u32 seq, u32 flags, int sk_ino)
{
	struct xdp_sock *xs = xdp_sk(sk);
	struct xdp_diag_msg *msg;
	struct nlmsghdr *nlh;

	nlh = nlmsg_put(nlskb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*msg),
			flags);
	if (!nlh)
		return -EMSGSIZE;

	msg = nlmsg_data(nlh);
	memset(msg, 0, sizeof(*msg));
	msg->xdiag_family = AF_XDP;
	msg->xdiag_type = sk->sk_type;
	msg->xdiag_ino = sk_ino;
	sock_diag_save_cookie(sk, msg->xdiag_cookie);

	if ((req->xdiag_show & XDP_SHOW_INFO) && xsk_diag_put_info(xs, nlskb))
		goto out_nlmsg_trim;

	if ((req->xdiag_show & XDP_SHOW_INFO) &&
	    nla_put_u32(nlskb, XDP_DIAG_UID,
			from_kuid_munged(user_ns, sock_i_uid(sk))))
		goto out_nlmsg_trim;

	if ((req->xdiag_show & XDP_SHOW_RING_CFG) &&
	    xsk_diag_put_rings_cfg(xs, nlskb))
		goto out_nlmsg_trim;

	if ((req->xdiag_show & XDP_SHOW_UMEM) &&
	    xsk_diag_put_umem(xs, nlskb))
		goto out_nlmsg_trim;

	if ((req->xdiag_show & XDP_SHOW_MEMINFO) &&
	    sock_diag_put_meminfo(sk, nlskb, XDP_DIAG_MEMINFO))
		goto out_nlmsg_trim;

	nlmsg_end(nlskb, nlh);
	return 0;

out_nlmsg_trim:
	nlmsg_cancel(nlskb, nlh);
	return -EMSGSIZE;
}

static int xsk_diag_dump(struct sk_buff *nlskb, struct netlink_callback *cb)
{
	struct xdp_diag_req *req = nlmsg_data(cb->nlh);
	struct net *net = sock_net(nlskb->sk);
	int num = 0, s_num = cb->args[0];
	struct sock *sk;

	mutex_lock(&net->xdp.lock);

	sk_for_each(sk, &net->xdp.list) {
		if (!net_eq(sock_net(sk), net))
			continue;
		if (num++ < s_num)
			continue;

		if (xsk_diag_fill(sk, nlskb, req,
				  sk_user_ns(NETLINK_CB(cb->skb).sk),
				  NETLINK_CB(cb->skb).portid,
				  cb->nlh->nlmsg_seq, NLM_F_MULTI,
				  sock_i_ino(sk)) < 0) {
			num--;
			break;
		}
	}

	mutex_unlock(&net->xdp.lock);
	cb->args[0] = num;
	return nlskb->len;
}

static int xsk_diag_handler_dump(struct sk_buff *nlskb, struct nlmsghdr *hdr)
{
	struct netlink_dump_control c = { .dump = xsk_diag_dump };
	int hdrlen = sizeof(struct xdp_diag_req);
	struct net *net = sock_net(nlskb->sk);

	if (nlmsg_len(hdr) < hdrlen)
		return -EINVAL;

	if (!(hdr->nlmsg_flags & NLM_F_DUMP))
		return -EOPNOTSUPP;

	return netlink_dump_start(net->diag_nlsk, nlskb, hdr, &c);
}

static const struct sock_diag_handler xsk_diag_handler = {
	.family = AF_XDP,
	.dump = xsk_diag_handler_dump,
};

static int __init xsk_diag_init(void)
{
	return sock_diag_register(&xsk_diag_handler);
}

static void __exit xsk_diag_exit(void)
{
	sock_diag_unregister(&xsk_diag_handler);
}

module_init(xsk_diag_init);
module_exit(xsk_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_XDP);