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88 lines
3.1 KiB
Diff
88 lines
3.1 KiB
Diff
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From: Felix Fietkau <nbd@nbd.name>
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Date: Thu, 1 Dec 2022 14:57:30 +0100
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Subject: [PATCH] wifi: mac80211: fix and simplify unencrypted drop check for
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mesh
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ieee80211_drop_unencrypted is called from ieee80211_rx_h_mesh_fwding and
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ieee80211_frame_allowed.
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Since ieee80211_rx_h_mesh_fwding can forward packets for other mesh nodes
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and is called earlier, it needs to check the decryptions status and if the
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packet is using the control protocol on its own, instead of deferring to
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the later call from ieee80211_frame_allowed.
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Because of that, ieee80211_drop_unencrypted has a mesh specific check
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that skips over the mesh header in order to check the payload protocol.
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This code is invalid when called from ieee80211_frame_allowed, since that
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happens after the 802.11->802.3 conversion.
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Fix this by moving the mesh specific check directly into
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ieee80211_rx_h_mesh_fwding.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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Link: https://lore.kernel.org/r/20221201135730.19723-1-nbd@nbd.name
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Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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---
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--- a/net/mac80211/rx.c
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+++ b/net/mac80211/rx.c
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@@ -2403,7 +2403,6 @@ static int ieee80211_802_1x_port_control
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static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
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{
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- struct ieee80211_hdr *hdr = (void *)rx->skb->data;
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struct sk_buff *skb = rx->skb;
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struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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@@ -2414,31 +2413,6 @@ static int ieee80211_drop_unencrypted(st
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if (status->flag & RX_FLAG_DECRYPTED)
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return 0;
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- /* check mesh EAPOL frames first */
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- if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
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- ieee80211_is_data(fc))) {
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- struct ieee80211s_hdr *mesh_hdr;
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- u16 hdr_len = ieee80211_hdrlen(fc);
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- u16 ethertype_offset;
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- __be16 ethertype;
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-
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- if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
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- goto drop_check;
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-
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- /* make sure fixed part of mesh header is there, also checks skb len */
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- if (!pskb_may_pull(rx->skb, hdr_len + 6))
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- goto drop_check;
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-
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- mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
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- ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
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- sizeof(rfc1042_header);
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-
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- if (skb_copy_bits(rx->skb, ethertype_offset, ðertype, 2) == 0 &&
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- ethertype == rx->sdata->control_port_protocol)
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- return 0;
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- }
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-
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-drop_check:
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/* Drop unencrypted frames if key is set. */
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if (unlikely(!ieee80211_has_protected(fc) &&
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!ieee80211_is_any_nullfunc(fc) &&
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@@ -2892,8 +2866,16 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
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hdr = (struct ieee80211_hdr *) skb->data;
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mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
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- if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
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- return RX_DROP_MONITOR;
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+ if (ieee80211_drop_unencrypted(rx, hdr->frame_control)) {
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+ int offset = hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr) +
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+ sizeof(rfc1042_header);
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+ __be16 ethertype;
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+
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+ if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr) ||
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+ skb_copy_bits(rx->skb, offset, ðertype, 2) != 0 ||
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+ ethertype != rx->sdata->control_port_protocol)
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+ return RX_DROP_MONITOR;
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+ }
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/* frame is in RMC, don't forward */
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if (ieee80211_is_data(hdr->frame_control) &&
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