1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * NXP Wireless LAN device driver: station RX data handling
4 *
5 * Copyright 2011-2020 NXP
6 */
7
8 #include <uapi/linux/ipv6.h>
9 #include <net/ndisc.h>
10 #include "decl.h"
11 #include "ioctl.h"
12 #include "util.h"
13 #include "fw.h"
14 #include "main.h"
15 #include "11n_aggr.h"
16 #include "11n_rxreorder.h"
17
18 /* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement
19 * frame. If frame has both source and destination mac address as same, this
20 * function drops such gratuitous frames.
21 */
22 static bool
mwifiex_discard_gratuitous_arp(struct mwifiex_private * priv,struct sk_buff * skb)23 mwifiex_discard_gratuitous_arp(struct mwifiex_private *priv,
24 struct sk_buff *skb)
25 {
26 const struct mwifiex_arp_eth_header *arp;
27 struct ethhdr *eth;
28 struct ipv6hdr *ipv6;
29 struct icmp6hdr *icmpv6;
30
31 eth = (struct ethhdr *)skb->data;
32 switch (ntohs(eth->h_proto)) {
33 case ETH_P_ARP:
34 arp = (void *)(skb->data + sizeof(struct ethhdr));
35 if (arp->hdr.ar_op == htons(ARPOP_REPLY) ||
36 arp->hdr.ar_op == htons(ARPOP_REQUEST)) {
37 if (!memcmp(arp->ar_sip, arp->ar_tip, 4))
38 return true;
39 }
40 break;
41 case ETH_P_IPV6:
42 ipv6 = (void *)(skb->data + sizeof(struct ethhdr));
43 icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +
44 sizeof(struct ipv6hdr));
45 if (NDISC_NEIGHBOUR_ADVERTISEMENT == icmpv6->icmp6_type) {
46 if (!memcmp(&ipv6->saddr, &ipv6->daddr,
47 sizeof(struct in6_addr)))
48 return true;
49 }
50 break;
51 default:
52 break;
53 }
54
55 return false;
56 }
57
58 /*
59 * This function processes the received packet and forwards it
60 * to kernel/upper layer.
61 *
62 * This function parses through the received packet and determines
63 * if it is a debug packet or normal packet.
64 *
65 * For non-debug packets, the function chops off unnecessary leading
66 * header bytes, reconstructs the packet as an ethernet frame or
67 * 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
68 *
69 * The completion callback is called after processing in complete.
70 */
mwifiex_process_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)71 int mwifiex_process_rx_packet(struct mwifiex_private *priv,
72 struct sk_buff *skb)
73 {
74 int ret;
75 struct rx_packet_hdr *rx_pkt_hdr;
76 struct rxpd *local_rx_pd;
77 int hdr_chop;
78 struct ethhdr *eth;
79 u16 rx_pkt_off, rx_pkt_len;
80 u8 *offset;
81 u8 adj_rx_rate = 0;
82
83 local_rx_pd = (struct rxpd *) (skb->data);
84
85 rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
86 rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
87 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
88
89 if (sizeof(rx_pkt_hdr->eth803_hdr) + sizeof(rfc1042_header) +
90 rx_pkt_off > skb->len) {
91 mwifiex_dbg(priv->adapter, ERROR,
92 "wrong rx packet offset: len=%d, rx_pkt_off=%d\n",
93 skb->len, rx_pkt_off);
94 priv->stats.rx_dropped++;
95 dev_kfree_skb_any(skb);
96 return -1;
97 }
98
99 if (sizeof(*rx_pkt_hdr) + rx_pkt_off <= skb->len &&
100 ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
101 sizeof(bridge_tunnel_header))) ||
102 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
103 sizeof(rfc1042_header)) &&
104 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
105 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX))) {
106 /*
107 * Replace the 803 header and rfc1042 header (llc/snap) with an
108 * EthernetII header, keep the src/dst and snap_type
109 * (ethertype).
110 * The firmware only passes up SNAP frames converting
111 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
112 * To create the Ethernet II, just move the src, dst address
113 * right before the snap_type.
114 */
115 eth = (struct ethhdr *)
116 ((u8 *) &rx_pkt_hdr->eth803_hdr
117 + sizeof(rx_pkt_hdr->eth803_hdr) +
118 sizeof(rx_pkt_hdr->rfc1042_hdr)
119 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
120 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
121 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
122
123 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
124 sizeof(eth->h_source));
125 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
126 sizeof(eth->h_dest));
127
128 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
129 header that was removed. */
130 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;
131 } else {
132 /* Chop off the rxpd */
133 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
134 (u8 *) local_rx_pd;
135 }
136
137 /* Chop off the leading header bytes so the it points to the start of
138 either the reconstructed EthII frame or the 802.2/llc/snap frame */
139 skb_pull(skb, hdr_chop);
140
141 if (priv->hs2_enabled &&
142 mwifiex_discard_gratuitous_arp(priv, skb)) {
143 mwifiex_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n");
144 dev_kfree_skb_any(skb);
145 return 0;
146 }
147
148 if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
149 ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
150 offset = (u8 *)local_rx_pd + rx_pkt_off;
151 mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);
152 }
153
154 /* Only stash RX bitrate for unicast packets. */
155 if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) {
156 priv->rxpd_rate = local_rx_pd->rx_rate;
157 priv->rxpd_htinfo = local_rx_pd->ht_info;
158 }
159
160 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA ||
161 GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
162 adj_rx_rate = mwifiex_adjust_data_rate(priv,
163 local_rx_pd->rx_rate,
164 local_rx_pd->ht_info);
165 mwifiex_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr,
166 local_rx_pd->nf);
167 }
168
169 ret = mwifiex_recv_packet(priv, skb);
170 if (ret == -1)
171 mwifiex_dbg(priv->adapter, ERROR,
172 "recv packet failed\n");
173
174 return ret;
175 }
176
177 /*
178 * This function processes the received buffer.
179 *
180 * The function looks into the RxPD and performs sanity tests on the
181 * received buffer to ensure its a valid packet, before processing it
182 * further. If the packet is determined to be aggregated, it is
183 * de-aggregated accordingly. Non-unicast packets are sent directly to
184 * the kernel/upper layers. Unicast packets are handed over to the
185 * Rx reordering routine if 11n is enabled.
186 *
187 * The completion callback is called after processing in complete.
188 */
mwifiex_process_sta_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)189 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
190 struct sk_buff *skb)
191 {
192 struct mwifiex_adapter *adapter = priv->adapter;
193 int ret = 0;
194 struct rxpd *local_rx_pd;
195 struct rx_packet_hdr *rx_pkt_hdr;
196 u8 ta[ETH_ALEN];
197 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
198 struct mwifiex_sta_node *sta_ptr;
199
200 local_rx_pd = (struct rxpd *) (skb->data);
201 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
202 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
203 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
204 seq_num = le16_to_cpu(local_rx_pd->seq_num);
205
206 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
207
208 if ((rx_pkt_offset + rx_pkt_length) > skb->len ||
209 sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) {
210 mwifiex_dbg(adapter, ERROR,
211 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
212 skb->len, rx_pkt_offset, rx_pkt_length);
213 priv->stats.rx_dropped++;
214 dev_kfree_skb_any(skb);
215 return ret;
216 }
217
218 if (rx_pkt_type == PKT_TYPE_MGMT) {
219 ret = mwifiex_process_mgmt_packet(priv, skb);
220 if (ret)
221 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
222 dev_kfree_skb_any(skb);
223 return ret;
224 }
225
226 /*
227 * If the packet is not an unicast packet then send the packet
228 * directly to os. Don't pass thru rx reordering
229 */
230 if ((!IS_11N_ENABLED(priv) &&
231 !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
232 !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) ||
233 !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
234 mwifiex_process_rx_packet(priv, skb);
235 return ret;
236 }
237
238 if (mwifiex_queuing_ra_based(priv) ||
239 (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
240 local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {
241 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
242 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&
243 local_rx_pd->priority < MAX_NUM_TID) {
244 sta_ptr = mwifiex_get_sta_entry(priv, ta);
245 if (sta_ptr)
246 sta_ptr->rx_seq[local_rx_pd->priority] =
247 le16_to_cpu(local_rx_pd->seq_num);
248 mwifiex_auto_tdls_update_peer_signal(priv, ta,
249 local_rx_pd->snr,
250 local_rx_pd->nf);
251 }
252 } else {
253 if (rx_pkt_type != PKT_TYPE_BAR &&
254 local_rx_pd->priority < MAX_NUM_TID)
255 priv->rx_seq[local_rx_pd->priority] = seq_num;
256 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
257 ETH_ALEN);
258 }
259
260 /* Reorder and send to OS */
261 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
262 ta, (u8) rx_pkt_type, skb);
263
264 if (ret || (rx_pkt_type == PKT_TYPE_BAR))
265 dev_kfree_skb_any(skb);
266
267 if (ret)
268 priv->stats.rx_dropped++;
269
270 return ret;
271 }
272