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Date: Tue, 12 Jul 2022 09:56:08 -0700 From: Tony Nguyen <anthony.l.nguyen@...el.com> To: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com Cc: Alan Brady <alan.brady@...el.com>, netdev@...r.kernel.org, anthony.l.nguyen@...el.com, yoshfuji@...ux-ipv6.org, dsahern@...nel.org, Gurucharan <gurucharanx.g@...el.com> Subject: [PATCH net-next 1/1] ping: fix ipv6 ping socket flow labels From: Alan Brady <alan.brady@...el.com> Ping sockets don't appear to make any attempt to preserve flow labels created and set by userspace. Instead they are always clobbered by autolabels (if enabled) or zero. This grabs the flowlabel out of the msghdr similar to how rawv6_sendmsg does it and moves the memset up so we don't zero it. Signed-off-by: Alan Brady <alan.brady@...el.com> Tested-by: Gurucharan <gurucharanx.g@...el.com> (A Contingent worker at Intel) Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com> --- net/ipv6/ping.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c index ecf3a553a0dc..b1179f62bd23 100644 --- a/net/ipv6/ping.c +++ b/net/ipv6/ping.c @@ -64,6 +64,8 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) if (err) return err; + memset(&fl6, 0, sizeof(fl6)); + if (msg->msg_name) { DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); if (msg->msg_namelen < sizeof(*u)) @@ -72,12 +74,15 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) return -EAFNOSUPPORT; } daddr = &(u->sin6_addr); + if (np->sndflow) + fl6.flowlabel = u->sin6_flowinfo & IPV6_FLOWINFO_MASK; if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) oif = u->sin6_scope_id; } else { if (sk->sk_state != TCP_ESTABLISHED) return -EDESTADDRREQ; daddr = &sk->sk_v6_daddr; + fl6.flowlabel = np->flow_label; } if (!oif) @@ -101,7 +106,6 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) ipc6.sockc.tsflags = sk->sk_tsflags; ipc6.sockc.mark = sk->sk_mark; - memset(&fl6, 0, sizeof(fl6)); fl6.flowi6_oif = oif; if (msg->msg_controllen) { -- 2.35.1
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