1// SPDX-License-Identifier: ISC
2/*
3 * Copyright (c) 2014 Broadcom Corporation
4 */
5
6#include <linux/vmalloc.h>
7#include <net/cfg80211.h>
8#include <net/netlink.h>
9
10#include <brcmu_wifi.h>
11#include "fwil_types.h"
12#include "core.h"
13#include "p2p.h"
14#include "debug.h"
15#include "cfg80211.h"
16#include "vendor.h"
17#include "fwil.h"
18
19static int brcmf_cfg80211_vndr_cmds_dcmd_handler(struct wiphy *wiphy,
20						 struct wireless_dev *wdev,
21						 const void *data, int len)
22{
23	struct brcmf_cfg80211_vif *vif;
24	struct brcmf_if *ifp;
25	const struct brcmf_vndr_dcmd_hdr *cmdhdr = data;
26	struct sk_buff *reply;
27	unsigned int payload, ret_len;
28	void *dcmd_buf = NULL, *wr_pointer;
29	u16 msglen, maxmsglen = PAGE_SIZE - 0x100;
30	int ret;
31
32	if (len < sizeof(*cmdhdr)) {
33		brcmf_err("vendor command too short: %d\n", len);
34		return -EINVAL;
35	}
36
37	vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev);
38	ifp = vif->ifp;
39
40	brcmf_dbg(TRACE, "ifidx=%d, cmd=%d\n", ifp->ifidx, cmdhdr->cmd);
41
42	if (cmdhdr->offset > len) {
43		brcmf_err("bad buffer offset %d > %d\n", cmdhdr->offset, len);
44		return -EINVAL;
45	}
46
47	len -= cmdhdr->offset;
48	ret_len = cmdhdr->len;
49	if (ret_len > 0 || len > 0) {
50		if (len > BRCMF_DCMD_MAXLEN) {
51			brcmf_err("oversize input buffer %d\n", len);
52			len = BRCMF_DCMD_MAXLEN;
53		}
54		if (ret_len > BRCMF_DCMD_MAXLEN) {
55			brcmf_err("oversize return buffer %d\n", ret_len);
56			ret_len = BRCMF_DCMD_MAXLEN;
57		}
58		payload = max_t(unsigned int, ret_len, len) + 1;
59		dcmd_buf = vzalloc(payload);
60		if (NULL == dcmd_buf)
61			return -ENOMEM;
62
63		memcpy(dcmd_buf, (void *)cmdhdr + cmdhdr->offset, len);
64		*(char *)(dcmd_buf + len)  = '\0';
65	}
66
67	if (cmdhdr->set)
68		ret = brcmf_fil_cmd_data_set(ifp, cmdhdr->cmd, dcmd_buf,
69					     ret_len);
70	else
71		ret = brcmf_fil_cmd_data_get(ifp, cmdhdr->cmd, dcmd_buf,
72					     ret_len);
73	if (ret != 0)
74		goto exit;
75
76	wr_pointer = dcmd_buf;
77	while (ret_len > 0) {
78		msglen = ret_len > maxmsglen ? maxmsglen : ret_len;
79		ret_len -= msglen;
80		payload = msglen + sizeof(msglen);
81		reply = cfg80211_vendor_cmd_alloc_reply_skb(wiphy, payload);
82		if (NULL == reply) {
83			ret = -ENOMEM;
84			break;
85		}
86
87		if (nla_put(reply, BRCMF_NLATTR_DATA, msglen, wr_pointer) ||
88		    nla_put_u16(reply, BRCMF_NLATTR_LEN, msglen)) {
89			kfree_skb(reply);
90			ret = -ENOBUFS;
91			break;
92		}
93
94		ret = cfg80211_vendor_cmd_reply(reply);
95		if (ret)
96			break;
97
98		wr_pointer += msglen;
99	}
100
101exit:
102	vfree(dcmd_buf);
103
104	return ret;
105}
106
107const struct wiphy_vendor_command brcmf_vendor_cmds[] = {
108	{
109		{
110			.vendor_id = BROADCOM_OUI,
111			.subcmd = BRCMF_VNDR_CMDS_DCMD
112		},
113		.flags = WIPHY_VENDOR_CMD_NEED_WDEV |
114			 WIPHY_VENDOR_CMD_NEED_NETDEV,
115		.policy = VENDOR_CMD_RAW_DATA,
116		.doit = brcmf_cfg80211_vndr_cmds_dcmd_handler
117	},
118};
119