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udp: Stop using RTO_ONLINK.

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Use ip_sendmsg_scope() to properly initialise the scope in
flowi4_init_output(), instead of overriding tos with the RTO_ONLINK
flag. The objective is to eventually remove RTO_ONLINK, which will
allow converting .flowi4_tos to dscp_t.

Now that the scope is determined by ip_sendmsg_scope(), we need to
check its result to set the 'connected' variable.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guillaume Nault 2023-05-22 16:38:07 +02:00 committed by David S. Miller
parent c85be08fc4
commit 0e26371db5
1 changed files with 6 additions and 11 deletions
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17
net/ipv4/udp.c
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@ -1062,8 +1062,8 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
int free = 0;
int connected = 0;
__be32 daddr, faddr, saddr;
u8 tos, scope;
__be16 dport;
u8 tos;
int err, is_udplite = IS_UDPLITE(sk);
int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE;
int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
@ -1183,12 +1183,9 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
connected = 0;
}
tos = get_rttos(&ipc, inet);
if (sock_flag(sk, SOCK_LOCALROUTE) ||
(msg->msg_flags & MSG_DONTROUTE) ||
(ipc.opt && ipc.opt->opt.is_strictroute)) {
tos |= RTO_ONLINK;
scope = ip_sendmsg_scope(inet, &ipc, msg);
if (scope == RT_SCOPE_LINK)
connected = 0;
}
if (ipv4_is_multicast(daddr)) {
if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
@ -1221,11 +1218,9 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
fl4 = &fl4_stack;
flowi4_init_output(fl4, ipc.oif, ipc.sockc.mark, tos,
RT_SCOPE_UNIVERSE, sk->sk_protocol,
flow_flags,
faddr, saddr, dport, inet->inet_sport,
sk->sk_uid);
flowi4_init_output(fl4, ipc.oif, ipc.sockc.mark, tos, scope,
sk->sk_protocol, flow_flags, faddr, saddr,
dport, inet->inet_sport, sk->sk_uid);
security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
rt = ip_route_output_flow(net, fl4, sk);