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 ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
90 sizeof(bridge_tunnel_header))) ||
91 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
92 sizeof(rfc1042_header)) &&
93 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
94 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
95 /*
96 * Replace the 803 header and rfc1042 header (llc/snap) with an
97 * EthernetII header, keep the src/dst and snap_type
98 * (ethertype).
99 * The firmware only passes up SNAP frames converting
100 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
101 * To create the Ethernet II, just move the src, dst address
102 * right before the snap_type.
103 */
104 eth = (struct ethhdr *)
105 ((u8 *) &rx_pkt_hdr->eth803_hdr
106 + sizeof(rx_pkt_hdr->eth803_hdr) +
107 sizeof(rx_pkt_hdr->rfc1042_hdr)
108 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
109 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
110 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
111
112 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
113 sizeof(eth->h_source));
114 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
115 sizeof(eth->h_dest));
116
117 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap
118 header that was removed. */
119 hdr_chop = (u8 *) eth - (u8 *) local_rx_pd;
120 } else {
121 /* Chop off the rxpd */
122 hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
123 (u8 *) local_rx_pd;
124 }
125
126 /* Chop off the leading header bytes so the it points to the start of
127 either the reconstructed EthII frame or the 802.2/llc/snap frame */
128 skb_pull(skb, hdr_chop);
129
130 if (priv->hs2_enabled &&
131 mwifiex_discard_gratuitous_arp(priv, skb)) {
132 mwifiex_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n");
133 dev_kfree_skb_any(skb);
134 return 0;
135 }
136
137 if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
138 ntohs(rx_pkt_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
139 offset = (u8 *)local_rx_pd + rx_pkt_off;
140 mwifiex_process_tdls_action_frame(priv, offset, rx_pkt_len);
141 }
142
143 /* Only stash RX bitrate for unicast packets. */
144 if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) {
145 priv->rxpd_rate = local_rx_pd->rx_rate;
146 priv->rxpd_htinfo = local_rx_pd->ht_info;
147 }
148
149 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA ||
150 GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
151 adj_rx_rate = mwifiex_adjust_data_rate(priv,
152 local_rx_pd->rx_rate,
153 local_rx_pd->ht_info);
154 mwifiex_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr,
155 local_rx_pd->nf);
156 }
157
158 ret = mwifiex_recv_packet(priv, skb);
159 if (ret == -1)
160 mwifiex_dbg(priv->adapter, ERROR,
161 "recv packet failed\n");
162
163 return ret;
164 }
165
166 /*
167 * This function processes the received buffer.
168 *
169 * The function looks into the RxPD and performs sanity tests on the
170 * received buffer to ensure its a valid packet, before processing it
171 * further. If the packet is determined to be aggregated, it is
172 * de-aggregated accordingly. Non-unicast packets are sent directly to
173 * the kernel/upper layers. Unicast packets are handed over to the
174 * Rx reordering routine if 11n is enabled.
175 *
176 * The completion callback is called after processing in complete.
177 */
mwifiex_process_sta_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)178 int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
179 struct sk_buff *skb)
180 {
181 struct mwifiex_adapter *adapter = priv->adapter;
182 int ret = 0;
183 struct rxpd *local_rx_pd;
184 struct rx_packet_hdr *rx_pkt_hdr;
185 u8 ta[ETH_ALEN];
186 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
187 struct mwifiex_sta_node *sta_ptr;
188
189 local_rx_pd = (struct rxpd *) (skb->data);
190 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
191 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
192 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
193 seq_num = le16_to_cpu(local_rx_pd->seq_num);
194
195 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
196
197 if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
198 mwifiex_dbg(adapter, ERROR,
199 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
200 skb->len, rx_pkt_offset, rx_pkt_length);
201 priv->stats.rx_dropped++;
202 dev_kfree_skb_any(skb);
203 return ret;
204 }
205
206 if (rx_pkt_type == PKT_TYPE_MGMT) {
207 ret = mwifiex_process_mgmt_packet(priv, skb);
208 if (ret)
209 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
210 dev_kfree_skb_any(skb);
211 return ret;
212 }
213
214 /*
215 * If the packet is not an unicast packet then send the packet
216 * directly to os. Don't pass thru rx reordering
217 */
218 if ((!IS_11N_ENABLED(priv) &&
219 !(ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
220 !(local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET))) ||
221 !ether_addr_equal_unaligned(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest)) {
222 mwifiex_process_rx_packet(priv, skb);
223 return ret;
224 }
225
226 if (mwifiex_queuing_ra_based(priv) ||
227 (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
228 local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET)) {
229 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
230 if (local_rx_pd->flags & MWIFIEX_RXPD_FLAGS_TDLS_PACKET &&
231 local_rx_pd->priority < MAX_NUM_TID) {
232 sta_ptr = mwifiex_get_sta_entry(priv, ta);
233 if (sta_ptr)
234 sta_ptr->rx_seq[local_rx_pd->priority] =
235 le16_to_cpu(local_rx_pd->seq_num);
236 mwifiex_auto_tdls_update_peer_signal(priv, ta,
237 local_rx_pd->snr,
238 local_rx_pd->nf);
239 }
240 } else {
241 if (rx_pkt_type != PKT_TYPE_BAR &&
242 local_rx_pd->priority < MAX_NUM_TID)
243 priv->rx_seq[local_rx_pd->priority] = seq_num;
244 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
245 ETH_ALEN);
246 }
247
248 /* Reorder and send to OS */
249 ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
250 ta, (u8) rx_pkt_type, skb);
251
252 if (ret || (rx_pkt_type == PKT_TYPE_BAR))
253 dev_kfree_skb_any(skb);
254
255 if (ret)
256 priv->stats.rx_dropped++;
257
258 return ret;
259 }
260