docs: networking: convert mac80211-injection.txt to ReST

- add SPDX header;
- adjust title markup;
- mark code blocks and literals as such;
- mark tables as such;
- adjust identation, whitespaces and blank lines;
- add to networking/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/index.rst

@@ -77,6 +77,7 @@ Contents:
    l2tp
    lapb-module
    ltpc
+   mac80211-injection
 
 .. only::  subproject and html
 

Documentation/networking/mac80211-injection.rst

@@ -1,9 +1,12 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=========================================
 How to use packet injection with mac80211
 =========================================
 
 mac80211 now allows arbitrary packets to be injected down any Monitor Mode
 interface from userland.  The packet you inject needs to be composed in the
-following format:
+following format::
 
  [ radiotap header  ]
  [ ieee80211 header ]
@@ -18,15 +21,19 @@ radiotap headers and used to control injection:
 
  * IEEE80211_RADIOTAP_FLAGS
 
-   IEEE80211_RADIOTAP_F_FCS: FCS will be removed and recalculated
+   =========================  ===========================================
-   IEEE80211_RADIOTAP_F_WEP: frame will be encrypted if key available
+   IEEE80211_RADIOTAP_F_FCS   FCS will be removed and recalculated
-   IEEE80211_RADIOTAP_F_FRAG: frame will be fragmented if longer than the
+   IEEE80211_RADIOTAP_F_WEP   frame will be encrypted if key available
+   IEEE80211_RADIOTAP_F_FRAG  frame will be fragmented if longer than the
 			      current fragmentation threshold.
+   =========================  ===========================================
 
  * IEEE80211_RADIOTAP_TX_FLAGS
 
-   IEEE80211_RADIOTAP_F_TX_NOACK: frame should be sent without waiting for
+   =============================  ========================================
+   IEEE80211_RADIOTAP_F_TX_NOACK  frame should be sent without waiting for
 				  an ACK even if it is a unicast frame
+   =============================  ========================================
 
  * IEEE80211_RADIOTAP_RATE
 
@@ -37,8 +44,10 @@ radiotap headers and used to control injection:
    HT rate for the transmission (only for devices without own rate control).
    Also some flags are parsed
 
-   IEEE80211_RADIOTAP_MCS_SGI: use short guard interval
+   ============================  ========================
-   IEEE80211_RADIOTAP_MCS_BW_40: send in HT40 mode
+   IEEE80211_RADIOTAP_MCS_SGI    use short guard interval
+   IEEE80211_RADIOTAP_MCS_BW_40  send in HT40 mode
+   ============================  ========================
 
  * IEEE80211_RADIOTAP_DATA_RETRIES
 
@@ -51,17 +60,17 @@ radiotap headers and used to control injection:
    without own rate control). Also other fields are parsed
 
    flags field
-   IEEE80211_RADIOTAP_VHT_FLAG_SGI: use short guard interval
+	IEEE80211_RADIOTAP_VHT_FLAG_SGI: use short guard interval
 
    bandwidth field
-   1: send using 40MHz channel width
+	* 1: send using 40MHz channel width
-   4: send using 80MHz channel width
+	* 4: send using 80MHz channel width
-   11: send using 160MHz channel width
+	* 11: send using 160MHz channel width
 
 The injection code can also skip all other currently defined radiotap fields
 facilitating replay of captured radiotap headers directly.
 
-Here is an example valid radiotap header defining some parameters
+Here is an example valid radiotap header defining some parameters::
 
 	0x00, 0x00, // <-- radiotap version
 	0x0b, 0x00, // <- radiotap header length
@@ -71,7 +80,7 @@ Here is an example valid radiotap header defining some parameters
 	0x01 //<-- antenna
 
 The ieee80211 header follows immediately afterwards, looking for example like
-this:
+this::
 
 	0x08, 0x01, 0x00, 0x00,
 	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
@@ -84,10 +93,10 @@ Then lastly there is the payload.
 After composing the packet contents, it is sent by send()-ing it to a logical
 mac80211 interface that is in Monitor mode.  Libpcap can also be used,
 (which is easier than doing the work to bind the socket to the right
-interface), along the following lines:
+interface), along the following lines:::
 
 	ppcap = pcap_open_live(szInterfaceName, 800, 1, 20, szErrbuf);
-...
+	...
 	r = pcap_inject(ppcap, u8aSendBuffer, nLength);
 
 You can also find a link to a complete inject application here:

MAINTAINERS

@@ -10079,7 +10079,7 @@ S:	Maintained
 W:	https://wireless.wiki.kernel.org/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211.git
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git
-F:	Documentation/networking/mac80211-injection.txt
+F:	Documentation/networking/mac80211-injection.rst
 F:	Documentation/networking/mac80211_hwsim/mac80211_hwsim.rst
 F:	drivers/net/wireless/mac80211_hwsim.[ch]
 F:	include/net/mac80211.h

net/mac80211/tx.c

@@ -2144,7 +2144,7 @@ static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
 
 		/*
 		 * Please update the file
-		 * Documentation/networking/mac80211-injection.txt
+		 * Documentation/networking/mac80211-injection.rst
 		 * when parsing new fields here.
 		 */