1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * NXP Wireless LAN device driver: station RX data handling
4 *
5 * Copyright 2011-2024 NXP
6 */
7
8 #include <uapi/linux/ipv6.h>
9 #include <net/ndisc.h>
10 #include "cfg.h"
11 #include "util.h"
12 #include "fw.h"
13 #include "main.h"
14 #include "11n_aggr.h"
15 #include "11n_rxreorder.h"
16
17 /*
18 * Drop gratuitous IPv4 ARP and IPv6 neighbour advertisements when
19 * source and destination addresses are identical.
20 */
21 static bool
nxpwifi_discard_gratuitous_arp(struct nxpwifi_private * priv,struct sk_buff * skb)22 nxpwifi_discard_gratuitous_arp(struct nxpwifi_private *priv,
23 struct sk_buff *skb)
24 {
25 const struct nxpwifi_arp_eth_header *arp;
26 struct ethhdr *eth;
27 struct ipv6hdr *ipv6;
28 struct icmp6hdr *icmpv6;
29
30 eth = (struct ethhdr *)skb->data;
31 switch (ntohs(eth->h_proto)) {
32 case ETH_P_ARP:
33 arp = (void *)(skb->data + sizeof(struct ethhdr));
34 if (arp->hdr.ar_op == htons(ARPOP_REPLY) ||
35 arp->hdr.ar_op == htons(ARPOP_REQUEST)) {
36 if (!memcmp(arp->ar_sip, arp->ar_tip, 4))
37 return true;
38 }
39 break;
40 case ETH_P_IPV6:
41 ipv6 = (void *)(skb->data + sizeof(struct ethhdr));
42 icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +
43 sizeof(struct ipv6hdr));
44 if (icmpv6->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
45 if (!memcmp(&ipv6->saddr, &ipv6->daddr,
46 sizeof(struct in6_addr)))
47 return true;
48 }
49 break;
50 default:
51 break;
52 }
53
54 return false;
55 }
56
57 /*
58 * Process a received data packet.
59 * Convert 802.2/LLC/SNAP to Ethernet II when appropriate, trim the
60 * rxpd and extra headers, optionally drop gratuitous ARP/NA, cache
61 * RX rate for unicast, then deliver to the stack.
62 */
nxpwifi_process_rx_packet(struct nxpwifi_private * priv,struct sk_buff * skb)63 int nxpwifi_process_rx_packet(struct nxpwifi_private *priv,
64 struct sk_buff *skb)
65 {
66 int ret;
67 struct rx_packet_hdr *rx_pkt_hdr;
68 struct rxpd *local_rx_pd;
69 int hdr_chop;
70 struct ethhdr *eth;
71 u16 rx_pkt_off;
72 u8 adj_rx_rate = 0;
73
74 local_rx_pd = (struct rxpd *)(skb->data);
75
76 rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
77 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
78
79 if (sizeof(rx_pkt_hdr->eth803_hdr) + sizeof(rfc1042_header) +
80 rx_pkt_off > skb->len) {
81 priv->stats.rx_dropped++;
82 dev_kfree_skb_any(skb);
83 return -EINVAL;
84 }
85
86 if (sizeof(*rx_pkt_hdr) + rx_pkt_off <= skb->len &&
87 ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
88 sizeof(bridge_tunnel_header))) ||
89 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
90 sizeof(rfc1042_header)) &&
91 rx_pkt_hdr->rfc1042_hdr.snap_type != htons(ETH_P_AARP) &&
92 rx_pkt_hdr->rfc1042_hdr.snap_type != htons(ETH_P_IPX)))) {
93 /*
94 * Replace the 803 header and rfc1042 header (llc/snap) with an
95 * EthernetII header, keep the src/dst and snap_type
96 * (ethertype).
97 * The firmware only passes up SNAP frames converting
98 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
99 * To create the Ethernet II, just move the src, dst address
100 * right before the snap_type.
101 */
102 eth = (struct ethhdr *)
103 ((u8 *)&rx_pkt_hdr->eth803_hdr
104 + sizeof(rx_pkt_hdr->eth803_hdr) +
105 sizeof(rx_pkt_hdr->rfc1042_hdr)
106 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
107 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
108 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
109
110 memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
111 sizeof(eth->h_source));
112 memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
113 sizeof(eth->h_dest));
114
115 /*
116 * Chop off the rxpd + the excess memory from the 802.2/llc/snap
117 * header that was removed.
118 */
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 - (u8 *)local_rx_pd;
123 }
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 */
129 skb_pull(skb, hdr_chop);
130
131 if (priv->hs2_enabled &&
132 nxpwifi_discard_gratuitous_arp(priv, skb)) {
133 nxpwifi_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n");
134 dev_kfree_skb_any(skb);
135 return 0;
136 }
137
138 /* Only stash RX bitrate for unicast packets. */
139 if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) {
140 priv->rxpd_rate = local_rx_pd->rx_rate;
141 priv->rxpd_htinfo = local_rx_pd->rate_info;
142 }
143
144 if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA ||
145 GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_UAP) {
146 adj_rx_rate = nxpwifi_adjust_data_rate(priv,
147 local_rx_pd->rx_rate,
148 local_rx_pd->rate_info);
149 nxpwifi_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr,
150 local_rx_pd->nf);
151 }
152
153 ret = nxpwifi_recv_packet(priv, skb);
154 if (ret)
155 nxpwifi_dbg(priv->adapter, ERROR,
156 "recv packet failed\n");
157
158 return ret;
159 }
160
161 /*
162 * Process a received buffer on the STA path.
163 * Validate RxPD and lengths, handle monitor/mgmt frames, fast-path
164 * non-unicast frames, and feed unicast data into 11n reorder/BA logic.
165 */
nxpwifi_process_sta_rx_packet(struct nxpwifi_private * priv,struct sk_buff * skb)166 int nxpwifi_process_sta_rx_packet(struct nxpwifi_private *priv,
167 struct sk_buff *skb)
168 {
169 struct nxpwifi_adapter *adapter = priv->adapter;
170 int ret = 0;
171 struct rxpd *local_rx_pd;
172 struct rx_packet_hdr *rx_pkt_hdr;
173 u8 ta[ETH_ALEN];
174 u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
175
176 local_rx_pd = (struct rxpd *)(skb->data);
177 rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
178 rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
179 rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
180 seq_num = le16_to_cpu(local_rx_pd->seq_num);
181
182 rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
183
184 if ((rx_pkt_offset + rx_pkt_length) > skb->len ||
185 sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) {
186 nxpwifi_dbg(adapter, ERROR,
187 "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
188 skb->len, rx_pkt_offset, rx_pkt_length);
189 priv->stats.rx_dropped++;
190 dev_kfree_skb_any(skb);
191 return ret;
192 }
193
194 if (priv->adapter->enable_net_mon && rx_pkt_type == PKT_TYPE_802DOT11) {
195 ret = nxpwifi_recv_packet_to_monif(priv, skb);
196 if (ret)
197 dev_kfree_skb_any(skb);
198 return ret;
199 }
200
201 if (rx_pkt_type == PKT_TYPE_MGMT) {
202 ret = nxpwifi_process_mgmt_packet(priv, skb);
203 if (ret && (ret != -EINPROGRESS))
204 nxpwifi_dbg(adapter, DATA, "Rx of mgmt packet failed");
205 if (ret != -EINPROGRESS)
206 dev_kfree_skb_any(skb);
207 return ret;
208 }
209
210 /*
211 * If the packet is not an unicast packet then send the packet
212 * directly to os. Don't pass thru rx reordering
213 */
214 if (!IS_11N_ENABLED(priv) ||
215 !ether_addr_equal_unaligned(priv->curr_addr,
216 rx_pkt_hdr->eth803_hdr.h_dest)) {
217 nxpwifi_process_rx_packet(priv, skb);
218 return ret;
219 }
220
221 if (nxpwifi_queuing_ra_based(priv)) {
222 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
223 } else {
224 if (rx_pkt_type != PKT_TYPE_BAR &&
225 local_rx_pd->priority < MAX_NUM_TID)
226 priv->rx_seq[local_rx_pd->priority] = seq_num;
227 memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
228 ETH_ALEN);
229 }
230
231 /* Reorder and send to OS */
232 ret = nxpwifi_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
233 ta, (u8)rx_pkt_type, skb);
234
235 if (ret || rx_pkt_type == PKT_TYPE_BAR)
236 dev_kfree_skb_any(skb);
237
238 if (ret)
239 priv->stats.rx_dropped++;
240
241 return ret;
242 }
243