Add LWIP RIO patch to patch dir.

.github/.wordlist.txt

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+eq
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+SDK's
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src/lwip/patches/README.md

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+# LwIP patches
+
+This directory contains patch files for LwIP that enable required or desired
+functionality in Matter. Patches that are not yet integrated into mainline LwIP
+are provided as a patch file. This file also contains a list of helpful patches
+that may not be present in vendor forks of the LwIP codebase
+
+## Un-merged patches
+
+### Route information options (RIO)
+
+Required for wifi devices to support communication with a thread device behind
+an open thread border router.
+
+-   patch file: rio_patch_updated.patch
+-   savannah link: https://savannah.nongnu.org/patch/?10114
+
+Troubleshooting: The patch uses the `ip6_addr_net_eq` function, which is a
+recent API change on upstream LwIP. The previous version of this function is
+`ip6_addr_netcmp`, so this function call may need to be replaced on older forks.
+
+## Important upstream patches
+
+### Malformed neighbor solicitation packet fix
+
+-   issue raised here
+    https://github.com/project-chip/connectedhomeip/issues/9791
+-   fixed in matter fork by
+    https://github.com/project-chip/connectedhomeip/pull/10160
+-   fixed in upstream by
+    https://git.savannah.nongnu.org/cgit/lwip.git/commit/?id=bc08c1d2b79b4763fc0f8f0bf0ed58e0c2899b3a
+
+### DHCPv6 DNS bug
+
+There was a bug in the DHCPv6 code where if the router sent a DNS using DHCPv6
+stateless, it would set the DNS server as an ipv4 address, which ended up being
+garbage. This would invalidate the whole DNS table, and lwip does not have a
+default backup.
+
+-   fixed in upstream here:
+    https://git.savannah.nongnu.org/cgit/lwip.git/commit/?id=941300c21c45a4dbf1c074b29a9ca3c88c9f6553