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Date: Tue, 11 Oct 2022 11:01:37 +0300 From: Eyal Birger <eyal.birger@...il.com> To: idosch@...sch.org, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, steffen.klassert@...unet.com, herbert@...dor.apana.org.au, dsahern@...nel.org, contact@...elbtn.com, pablo@...filter.org, nicolas.dichtel@...nd.com, razor@...ckwall.org, daniel@...earbox.net Cc: netdev@...r.kernel.org, Eyal Birger <eyal.birger@...il.com> Subject: [PATCH ipsec] xfrm: lwtunnel: squelch kernel warning in case XFRM encap type is not available Ido reported that a kernel warning [1] can be triggered from user space when the kernel is compiled with CONFIG_MODULES=y and CONFIG_XFRM=n when adding an xfrm encap type route, e.g: $ ip route add 198.51.100.0/24 dev dummy1 encap xfrm if_id 1 Error: lwt encapsulation type not supported. The reason for the warning is that the LWT infrastructure has an autoloading feature which is meant only for encap types that don't use a net device, which is not the case in xfrm encap. Mute this warning for xfrm encap as there's no encap module to autoload in this case. [1] WARNING: CPU: 3 PID: 2746262 at net/core/lwtunnel.c:57 lwtunnel_valid_encap_type+0x4f/0x120 [...] Call Trace: <TASK> rtm_to_fib_config+0x211/0x350 inet_rtm_newroute+0x3a/0xa0 rtnetlink_rcv_msg+0x154/0x3c0 netlink_rcv_skb+0x49/0xf0 netlink_unicast+0x22f/0x350 netlink_sendmsg+0x208/0x440 ____sys_sendmsg+0x21f/0x250 ___sys_sendmsg+0x83/0xd0 __sys_sendmsg+0x54/0xa0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Reported-by: Ido Schimmel <idosch@...sch.org> Fixes: 2c2493b9da91 ("xfrm: lwtunnel: add lwtunnel support for xfrm interfaces in collect_md mode") Signed-off-by: Eyal Birger <eyal.birger@...il.com> --- net/core/lwtunnel.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/core/lwtunnel.c b/net/core/lwtunnel.c index 6fac2f0ef074..711cd3b4347a 100644 --- a/net/core/lwtunnel.c +++ b/net/core/lwtunnel.c @@ -48,9 +48,11 @@ static const char *lwtunnel_encap_str(enum lwtunnel_encap_types encap_type) return "RPL"; case LWTUNNEL_ENCAP_IOAM6: return "IOAM6"; + case LWTUNNEL_ENCAP_XFRM: + /* module autoload not supported for encap type */ + return NULL; case LWTUNNEL_ENCAP_IP6: case LWTUNNEL_ENCAP_IP: - case LWTUNNEL_ENCAP_XFRM: case LWTUNNEL_ENCAP_NONE: case __LWTUNNEL_ENCAP_MAX: /* should not have got here */ -- 2.34.1
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