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mac80211: allow rx of mesh eapol frames with default rx key

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Without this patch, eapol frames cannot be received in mesh
mode, when 802.1X should be used. Initially only a MGTK is
defined, which is found and set as rx->key, when there are
no other keys set. ieee80211_drop_unencrypted would then
drop these eapol frames, as they are data frames without
encryption and there exists some rx->key.

Fix this by differentiating between mesh eapol frames and
other data frames with existing rx->key. Allow mesh mesh
eapol frames only if they are for our vif address.

With this patch in-place, ieee80211_rx_h_mesh_fwding continues
after the ieee80211_drop_unencrypted check and notices, that
these eapol frames have to be delivered locally, as they should.

Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
Link: https://lore.kernel.org/r/20200625104214.50319-1-markus.theil@tu-ilmenau.de
[small code cleanups]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Markus Theil 2020-06-25 12:42:14 +02:00 committed by Johannes Berg
parent 5af7fef39d
commit 0b467b6387
1 changed files with 26 additions and 0 deletions
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26
net/mac80211/rx.c
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@ -2396,6 +2396,7 @@ static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
{
struct ieee80211_hdr *hdr = (void *)rx->skb->data;
struct sk_buff *skb = rx->skb;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
@ -2406,6 +2407,31 @@ static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
if (status->flag & RX_FLAG_DECRYPTED)
return 0;
/* check mesh EAPOL frames first */
if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
ieee80211_is_data(fc))) {
struct ieee80211s_hdr *mesh_hdr;
u16 hdr_len = ieee80211_hdrlen(fc);
u16 ethertype_offset;
__be16 ethertype;
if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
goto drop_check;
/* make sure fixed part of mesh header is there, also checks skb len */
if (!pskb_may_pull(rx->skb, hdr_len + 6))
goto drop_check;
mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
sizeof(rfc1042_header);
if (skb_copy_bits(rx->skb, ethertype_offset, &ethertype, 2) == 0 &&
ethertype == rx->sdata->control_port_protocol)
return 0;
}
drop_check:
/* Drop unencrypted frames if key is set. */
if (unlikely(!ieee80211_has_protected(fc) &&
!ieee80211_is_any_nullfunc(fc) &&