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gre/sit: Don't generate link-local addr if addr_gen_mode is IN6_ADDR_GEN_MODE_NONE 

When addr_gen_mode is set to IN6_ADDR_GEN_MODE_NONE, the link-local addr
should not be generated. But it isn't the case for GRE (as well as GRE6)
and SIT tunnels. Make it so that tunnels consider the addr_gen_mode,
especially for IN6_ADDR_GEN_MODE_NONE.

Do this in add_v4_addrs() to cover both GRE and SIT only if the addr
scope is link.

Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com>
Acked-by: Antonio Quartulli <a@unstable.cc>
Link: https://lore.kernel.org/r/20211020200618.467342-1-ssuryaextr@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stephen Suryaputra 2021-10-20 16:06:18 -04:00 committed by Jakub Kicinski
parent f3956e309e
commit 61e18ce734
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/addrconf.c
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@ -3110,6 +3110,9 @@ static void add_v4_addrs(struct inet6_dev *idev)
memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
if (idev->dev->flags&IFF_POINTOPOINT) {
if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
return;
addr.s6_addr32[0] = htonl(0xfe800000);
scope = IFA_LINK;
plen = 64;