ipv4: remove obsolete EXPORT_SYMBOL() and EXPORT_SYMBOL_GPL()

These symbols no longer need to be exported, they are only used from
vmlinux:

- inet_send_prepare
- inet_splice_eof
- inet_sk_rebuild_header
- inet_current_timestamp
- snmp_fold_field
- snmp_get_cpu_field64
- snmp_fold_field64
- fib_nh_common_release
- fib_nh_common_init
- fib_nexthop_info
- fib_add_nexthop
- ip_build_and_send_pkt
- ipv4_sk_update_pmtu
- ipv4_sk_redirect
- rt_dst_clone

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20260604173413.2782008-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/ipv4/af_inet.c

@@ -852,7 +852,6 @@ int inet_send_prepare(struct sock *sk)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(inet_send_prepare);
 
 int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 {
@@ -881,7 +880,6 @@ void inet_splice_eof(struct socket *sock)
 	if (prot->splice_eof)
 		prot->splice_eof(sock);
 }
-EXPORT_SYMBOL_GPL(inet_splice_eof);
 
 int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 		 int flags)
@@ -1349,7 +1347,6 @@ int inet_sk_rebuild_header(struct sock *sk)
 
 	return err;
 }
-EXPORT_SYMBOL(inet_sk_rebuild_header);
 
 void inet_sk_set_state(struct sock *sk, int state)
 {
@@ -1579,7 +1576,6 @@ __be32 inet_current_timestamp(void)
 	/* Convert to network byte order. */
 	return htonl(msecs);
 }
-EXPORT_SYMBOL(inet_current_timestamp);
 
 int inet_recv_error(struct sock *sk, struct msghdr *msg, int len)
 {
@@ -1665,7 +1661,6 @@ unsigned long snmp_fold_field(void __percpu *mib, int offt)
 		res += snmp_get_cpu_field(mib, i, offt);
 	return res;
 }
-EXPORT_SYMBOL_GPL(snmp_fold_field);
 
 #if BITS_PER_LONG==32
 
@@ -1686,7 +1681,6 @@ u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
 
 	return v;
 }
-EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
 
 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
 {
@@ -1698,7 +1692,6 @@ u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
 	}
 	return res;
 }
-EXPORT_SYMBOL_GPL(snmp_fold_field64);
 #endif
 
 #ifdef CONFIG_IP_MULTICAST

net/ipv4/fib_semantics.c

@@ -207,7 +207,6 @@ void fib_nh_common_release(struct fib_nh_common *nhc)
 	rt_fibinfo_free(&nhc->nhc_rth_input);
 	free_nh_exceptions(nhc);
 }
-EXPORT_SYMBOL_GPL(fib_nh_common_release);
 
 void fib_nh_release(struct net *net, struct fib_nh *fib_nh)
 {
@@ -639,7 +638,6 @@ int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc,
 	nhc->nhc_pcpu_rth_output = NULL;
 	return err;
 }
-EXPORT_SYMBOL_GPL(fib_nh_common_init);
 
 int fib_nh_init(struct net *net, struct fib_nh *nh,
 		struct fib_config *cfg, int nh_weight,
@@ -1642,7 +1640,6 @@ int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc,
 nla_put_failure:
 	return -EMSGSIZE;
 }
-EXPORT_SYMBOL_GPL(fib_nexthop_info);
 
 #if IS_ENABLED(CONFIG_IP_ROUTE_MULTIPATH) || IS_ENABLED(CONFIG_IPV6)
 int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc,
@@ -1675,7 +1672,6 @@ int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc,
 nla_put_failure:
 	return -EMSGSIZE;
 }
-EXPORT_SYMBOL_GPL(fib_add_nexthop);
 #endif
 
 #ifdef CONFIG_IP_ROUTE_MULTIPATH

net/ipv4/ip_output.c

@@ -195,7 +195,6 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
 	/* Send it out. */
 	return ip_local_out(net, skb->sk, skb);
 }
-EXPORT_SYMBOL_GPL(ip_build_and_send_pkt);
 
 static int ip_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
 {

net/ipv4/route.c

@@ -1171,7 +1171,6 @@ void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu)
 	bh_unlock_sock(sk);
 	dst_release(odst);
 }
-EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu);
 
 void ipv4_redirect(struct sk_buff *skb, struct net *net,
 		   int oif, u8 protocol)
@@ -1203,7 +1202,6 @@ void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk)
 		ip_rt_put(rt);
 	}
 }
-EXPORT_SYMBOL_GPL(ipv4_sk_redirect);
 
 INDIRECT_CALLABLE_SCOPE struct dst_entry *ipv4_dst_check(struct dst_entry *dst,
 							 u32 cookie)
@@ -1701,7 +1699,6 @@ struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt)
 	}
 	return new_rt;
 }
-EXPORT_SYMBOL(rt_dst_clone);
 
 /* called in rcu_read_lock() section */
 enum skb_drop_reason