From: Jakub Kicinski <kuba@kernel.org>
Date: Tue, 12 Oct 2021 08:58:38 -0700
Subject: ipv6: constify dev_addr passing
Patch-mainline: v5.16-rc1
Git-commit: 1a8a23d2da4fec6f090ec26bbe76eab2b77410e9
References: jsc#PED-1565

In preparation for netdev->dev_addr being constant
make all relevant arguments in ndisc constant.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/net/ndisc.h |    2 +-
 net/ipv6/addrconf.c |    4 ++--
 net/ipv6/ndisc.c    |    4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -137,7 +137,7 @@ struct ndisc_options *ndisc_parse_option
 					  u8 *opt, int opt_len,
 					  struct ndisc_options *ndopts);
 
-void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
+void __ndisc_fill_addr_option(struct sk_buff *skb, int type, const void *data,
 			      int data_len, int pad);
 
 #define NDISC_OPS_REDIRECT_DATA_SPACE	2
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2230,12 +2230,12 @@ static int addrconf_ifid_6lowpan(u8 *eui
 
 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
 {
-	union fwnet_hwaddr *ha;
+	const union fwnet_hwaddr *ha;
 
 	if (dev->addr_len != FWNET_ALEN)
 		return -1;
 
-	ha = (union fwnet_hwaddr *)dev->dev_addr;
+	ha = (const union fwnet_hwaddr *)dev->dev_addr;
 
 	memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
 	eui[0] ^= 2;
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -142,7 +142,7 @@ struct neigh_table nd_tbl = {
 };
 EXPORT_SYMBOL_GPL(nd_tbl);
 
-void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
+void __ndisc_fill_addr_option(struct sk_buff *skb, int type, const void *data,
 			      int data_len, int pad)
 {
 	int space = __ndisc_opt_addr_space(data_len, pad);
@@ -165,7 +165,7 @@ void __ndisc_fill_addr_option(struct sk_
 EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option);
 
 static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type,
-					  void *data, u8 icmp6_type)
+					  const void *data, u8 icmp6_type)
 {
 	__ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len,
 				 ndisc_addr_option_pad(skb->dev->type));