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cfg80211: remove unused function ieee80211_data_from_8023()
This function hasn't been used since the removal of iwmc3200wifi in 2012. It also appears to have a bug when qos=True, since then it'll copy uninitialized stack memory to the SKB. Just remove the function entirely. Reported-by: Jouni Malinen <j@w1.fi> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
parent
62b093b375
commit
a6bcda4484
@ -299,9 +299,6 @@ Data path helpers
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.. kernel-doc:: include/net/cfg80211.h
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:functions: ieee80211_data_to_8023
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.. kernel-doc:: include/net/cfg80211.h
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:functions: ieee80211_data_from_8023
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.. kernel-doc:: include/net/cfg80211.h
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:functions: ieee80211_amsdu_to_8023s
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@ -4346,19 +4346,6 @@ static inline int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
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return ieee80211_data_to_8023_exthdr(skb, NULL, addr, iftype);
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}
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/**
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* ieee80211_data_from_8023 - convert an 802.3 frame to 802.11
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* @skb: the 802.3 frame
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* @addr: the device MAC address
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* @iftype: the virtual interface type
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* @bssid: the network bssid (used only for iftype STATION and ADHOC)
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* @qos: build 802.11 QoS data frame
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* Return: 0 on success, or a negative error code.
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*/
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int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
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enum nl80211_iftype iftype, const u8 *bssid,
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bool qos);
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/**
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* ieee80211_amsdu_to_8023s - decode an IEEE 802.11n A-MSDU frame
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*
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@ -529,121 +529,6 @@ int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
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}
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EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
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int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
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enum nl80211_iftype iftype,
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const u8 *bssid, bool qos)
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{
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struct ieee80211_hdr hdr;
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u16 hdrlen, ethertype;
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__le16 fc;
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const u8 *encaps_data;
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int encaps_len, skip_header_bytes;
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int nh_pos, h_pos;
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int head_need;
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if (unlikely(skb->len < ETH_HLEN))
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return -EINVAL;
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nh_pos = skb_network_header(skb) - skb->data;
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h_pos = skb_transport_header(skb) - skb->data;
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/* convert Ethernet header to proper 802.11 header (based on
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* operation mode) */
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ethertype = (skb->data[12] << 8) | skb->data[13];
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fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
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switch (iftype) {
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case NL80211_IFTYPE_AP:
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case NL80211_IFTYPE_AP_VLAN:
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case NL80211_IFTYPE_P2P_GO:
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fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
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/* DA BSSID SA */
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memcpy(hdr.addr1, skb->data, ETH_ALEN);
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memcpy(hdr.addr2, addr, ETH_ALEN);
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memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
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hdrlen = 24;
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break;
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case NL80211_IFTYPE_STATION:
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case NL80211_IFTYPE_P2P_CLIENT:
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fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
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/* BSSID SA DA */
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memcpy(hdr.addr1, bssid, ETH_ALEN);
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memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
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memcpy(hdr.addr3, skb->data, ETH_ALEN);
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hdrlen = 24;
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break;
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case NL80211_IFTYPE_OCB:
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case NL80211_IFTYPE_ADHOC:
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/* DA SA BSSID */
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memcpy(hdr.addr1, skb->data, ETH_ALEN);
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memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
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memcpy(hdr.addr3, bssid, ETH_ALEN);
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hdrlen = 24;
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break;
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default:
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return -EOPNOTSUPP;
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}
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if (qos) {
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fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
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hdrlen += 2;
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}
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hdr.frame_control = fc;
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hdr.duration_id = 0;
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hdr.seq_ctrl = 0;
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skip_header_bytes = ETH_HLEN;
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if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
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encaps_data = bridge_tunnel_header;
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encaps_len = sizeof(bridge_tunnel_header);
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skip_header_bytes -= 2;
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} else if (ethertype >= ETH_P_802_3_MIN) {
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encaps_data = rfc1042_header;
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encaps_len = sizeof(rfc1042_header);
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skip_header_bytes -= 2;
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} else {
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encaps_data = NULL;
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encaps_len = 0;
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}
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skb_pull(skb, skip_header_bytes);
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nh_pos -= skip_header_bytes;
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h_pos -= skip_header_bytes;
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head_need = hdrlen + encaps_len - skb_headroom(skb);
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if (head_need > 0 || skb_cloned(skb)) {
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head_need = max(head_need, 0);
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if (head_need)
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skb_orphan(skb);
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if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
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return -ENOMEM;
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}
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if (encaps_data) {
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memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
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nh_pos += encaps_len;
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h_pos += encaps_len;
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}
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memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
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nh_pos += hdrlen;
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h_pos += hdrlen;
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/* Update skb pointers to various headers since this modified frame
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* is going to go through Linux networking code that may potentially
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* need things like pointer to IP header. */
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skb_reset_mac_header(skb);
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skb_set_network_header(skb, nh_pos);
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skb_set_transport_header(skb, h_pos);
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return 0;
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}
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EXPORT_SYMBOL(ieee80211_data_from_8023);
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static void
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__frame_add_frag(struct sk_buff *skb, struct page *page,
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void *ptr, int len, int size)
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