From 5806ef25bc6e6cf0c04005ff25a4585437d567de Mon Sep 17 00:00:00 2001 From: Benjamin Berg Date: Sun, 27 Aug 2023 14:05:22 +0300 Subject: wifi: cfg80211: add ieee80211_fragment_element to public API This function will be used by the kunit tests within cfg80211. As it is generally useful, move it from mac80211 to cfg80211. Signed-off-by: Benjamin Berg Signed-off-by: Gregory Greenman Link: https://lore.kernel.org/r/20230827135854.5af9391659f5.Ie534ed6591ba02be8572d4d7242394f29e3af04b@changeid Signed-off-by: Johannes Berg --- net/wireless/util.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'net/wireless/util.c') diff --git a/net/wireless/util.c b/net/wireless/util.c index fff99fe43fdd..56cbd9979a3f 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -1966,6 +1966,35 @@ size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen, } EXPORT_SYMBOL(ieee80211_ie_split_ric); +void ieee80211_fragment_element(struct sk_buff *skb, u8 *len_pos, u8 frag_id) +{ + unsigned int elem_len; + + if (!len_pos) + return; + + elem_len = skb->data + skb->len - len_pos - 1; + + while (elem_len > 255) { + /* this one is 255 */ + *len_pos = 255; + /* remaining data gets smaller */ + elem_len -= 255; + /* make space for the fragment ID/len in SKB */ + skb_put(skb, 2); + /* shift back the remaining data to place fragment ID/len */ + memmove(len_pos + 255 + 3, len_pos + 255 + 1, elem_len); + /* place the fragment ID */ + len_pos += 255 + 1; + *len_pos = frag_id; + /* and point to fragment length to update later */ + len_pos++; + } + + *len_pos = elem_len; +} +EXPORT_SYMBOL(ieee80211_fragment_element); + bool ieee80211_operating_class_to_band(u8 operating_class, enum nl80211_band *band) { -- cgit v1.2.3