package/kernel/mac80211/patches/338-v4.19-0003-brcmfmac-handle-msgbuf-packets-marked-with-monitor-m.patch

   1 From a8d7631858aff156b72f807ee7cc062048e63836 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Sun, 24 Jun 2018 21:44:37 +0200
   4 Subject: [PATCH] brcmfmac: handle msgbuf packets marked with monitor mode flag
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 New Broadcom firmwares mark monitor mode packets using a newly defined
  10 bit in the flags field. Use it to filter them out and pass to the
  11 monitor interface. These defines were found in bcmmsgbuf.h from SDK.
  12
  13 As not every firmware generates radiotap header this commit introduces
  14 BRCMF_FEAT_MONITOR_FMT_RADIOTAP flag. It has to be has based on firmware
  15 capabilities. If not present brcmf_netif_mon_rx() will assume packet is
  16 a raw 802.11 frame and will prepend it with an empty radiotap header.
  17
  18 This new code is limited to the msgbuf protocol at this point. Adding
  19 support for SDIO/USB devices will require some extra work (possibly a
  20 new firmware release).
  21
  22 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  23 Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
  24 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  25 ---
  26  .../wireless/broadcom/brcm80211/brcmfmac/core.c    | 25 ++++++++++++++++++++++
  27  .../wireless/broadcom/brcm80211/brcmfmac/core.h    |  2 ++
  28  .../wireless/broadcom/brcm80211/brcmfmac/msgbuf.c  | 18 ++++++++++++++++
  29  3 files changed, 45 insertions(+)
  30
  31 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
  32 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
  33 @@ -21,6 +21,7 @@
  34  #include <net/cfg80211.h>
  35  #include <net/rtnetlink.h>
  36  #include <net/addrconf.h>
  37 +#include <net/ieee80211_radiotap.h>
  38  #include <net/ipv6.h>
  39  #include <brcmu_utils.h>
  40  #include <brcmu_wifi.h>
  41 @@ -404,6 +405,30 @@ void brcmf_netif_rx(struct brcmf_if *ifp
  42                 netif_rx_ni(skb);
  43  }
  44
  45 +void brcmf_netif_mon_rx(struct brcmf_if *ifp, struct sk_buff *skb)
  46 +{
  47 +       if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_MONITOR_FMT_RADIOTAP)) {
  48 +               /* Do nothing */
  49 +       } else {
  50 +               struct ieee80211_radiotap_header *radiotap;
  51 +
  52 +               /* TODO: use RX status to fill some radiotap data */
  53 +               radiotap = skb_push(skb, sizeof(*radiotap));
  54 +               memset(radiotap, 0, sizeof(*radiotap));
  55 +               radiotap->it_len = cpu_to_le16(sizeof(*radiotap));
  56 +
  57 +               /* TODO: 4 bytes with receive status? */
  58 +               skb->len -= 4;
  59 +       }
  60 +
  61 +       skb->dev = ifp->ndev;
  62 +       skb_reset_mac_header(skb);
  63 +       skb->pkt_type = PACKET_OTHERHOST;
  64 +       skb->protocol = htons(ETH_P_802_2);
  65 +
  66 +       brcmf_netif_rx(ifp, skb);
  67 +}
  68 +
  69  static int brcmf_rx_hdrpull(struct brcmf_pub *drvr, struct sk_buff *skb,
  70                             struct brcmf_if **ifp)
  71  {
  72 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h
  73 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h
  74 @@ -121,6 +121,7 @@ struct brcmf_pub {
  75
  76         struct brcmf_if *iflist[BRCMF_MAX_IFS];
  77         s32 if2bss[BRCMF_MAX_IFS];
  78 +       struct brcmf_if *mon_if;
  79
  80         struct mutex proto_block;
  81         unsigned char proto_buf[BRCMF_DCMD_MAXLEN];
  82 @@ -216,6 +217,7 @@ void brcmf_txflowblock_if(struct brcmf_i
  83                           enum brcmf_netif_stop_reason reason, bool state);
  84  void brcmf_txfinalize(struct brcmf_if *ifp, struct sk_buff *txp, bool success);
  85  void brcmf_netif_rx(struct brcmf_if *ifp, struct sk_buff *skb);
  86 +void brcmf_netif_mon_rx(struct brcmf_if *ifp, struct sk_buff *skb);
  87  void brcmf_net_setcarrier(struct brcmf_if *ifp, bool on);
  88  int __init brcmf_core_init(void);
  89  void __exit brcmf_core_exit(void);
  90 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c
  91 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c
  92 @@ -69,6 +69,8 @@
  93  #define BRCMF_MSGBUF_MAX_EVENTBUF_POST         8
  94
  95  #define BRCMF_MSGBUF_PKT_FLAGS_FRAME_802_3     0x01
  96 +#define BRCMF_MSGBUF_PKT_FLAGS_FRAME_802_11    0x02
  97 +#define BRCMF_MSGBUF_PKT_FLAGS_FRAME_MASK      0x07
  98  #define BRCMF_MSGBUF_PKT_FLAGS_PRIO_SHIFT      5
  99
 100  #define BRCMF_MSGBUF_TX_FLUSH_CNT1             32
 101 @@ -1128,6 +1130,7 @@ brcmf_msgbuf_process_rx_complete(struct
 102         struct sk_buff *skb;
 103         u16 data_offset;
 104         u16 buflen;
 105 +       u16 flags;
 106         u32 idx;
 107         struct brcmf_if *ifp;
 108
 109 @@ -1137,6 +1140,7 @@ brcmf_msgbuf_process_rx_complete(struct
 110         data_offset = le16_to_cpu(rx_complete->data_offset);
 111         buflen = le16_to_cpu(rx_complete->data_len);
 112         idx = le32_to_cpu(rx_complete->msg.request_id);
 113 +       flags = le16_to_cpu(rx_complete->flags);
 114
 115         skb = brcmf_msgbuf_get_pktid(msgbuf->drvr->bus_if->dev,
 116                                      msgbuf->rx_pktids, idx);
 117 @@ -1150,6 +1154,20 @@ brcmf_msgbuf_process_rx_complete(struct
 118
 119         skb_trim(skb, buflen);
 120
 121 +       if ((flags & BRCMF_MSGBUF_PKT_FLAGS_FRAME_MASK) ==
 122 +           BRCMF_MSGBUF_PKT_FLAGS_FRAME_802_11) {
 123 +               ifp = msgbuf->drvr->mon_if;
 124 +
 125 +               if (!ifp) {
 126 +                       brcmf_err("Received unexpected monitor pkt\n");
 127 +                       brcmu_pkt_buf_free_skb(skb);
 128 +                       return;
 129 +               }
 130 +
 131 +               brcmf_netif_mon_rx(ifp, skb);
 132 +               return;
 133 +       }
 134 +
 135         ifp = brcmf_get_ifp(msgbuf->drvr, rx_complete->msg.ifidx);
 136         if (!ifp || !ifp->ndev) {
 137                 brcmf_err("Received pkt for invalid ifidx %d\n",