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Commit 77157e19 authored by Tom Herbert's avatar Tom Herbert Committed by David S. Miller
Browse files

l2tp: call udp{6}_set_csum 



Call common functions to set checksum for UDP tunnel.

Signed-off-by: default avatarTom Herbert <therbert@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent af5fcba7

net/l2tp/l2tp_core.c

+5 −49
Original line number Diff line number Diff line
@@ -1095,33 +1095,6 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb, 
	return 0;

}



#if IS_ENABLED(CONFIG_IPV6)

static void l2tp_xmit_ipv6_csum(struct sock *sk, struct sk_buff *skb,

				int udp_len)

{

	struct ipv6_pinfo *np = inet6_sk(sk);

	struct udphdr *uh = udp_hdr(skb);



	if (udp_get_no_check6_tx(sk))

		skb->ip_summed = CHECKSUM_NONE;

	else if (!skb_dst(skb) || !skb_dst(skb)->dev ||

	    !(skb_dst(skb)->dev->features & NETIF_F_IPV6_CSUM)) {

		__wsum csum = skb_checksum(skb, 0, udp_len, 0);

		skb->ip_summed = CHECKSUM_UNNECESSARY;

		uh->check = csum_ipv6_magic(&np->saddr, &sk->sk_v6_daddr, udp_len,

					    IPPROTO_UDP, csum);

		if (uh->check == 0)

			uh->check = CSUM_MANGLED_0;

	} else {

		skb->ip_summed = CHECKSUM_PARTIAL;

		skb->csum_start = skb_transport_header(skb) - skb->head;

		skb->csum_offset = offsetof(struct udphdr, check);

		uh->check = ~csum_ipv6_magic(&np->saddr, &sk->sk_v6_daddr,

					     udp_len, IPPROTO_UDP, 0);

	}

}

#endif



/* If caller requires the skb to have a ppp header, the header must be

 * inserted in the skb data before calling this function.

 */
@@ -1133,7 +1106,6 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len 
	struct flowi *fl;

	struct udphdr *uh;

	struct inet_sock *inet;

	__wsum csum;

	int headroom;

	int uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;

	int udp_len;
@@ -1182,33 +1154,17 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len 
		uh->dest = inet->inet_dport;

		udp_len = uhlen + hdr_len + data_len;

		uh->len = htons(udp_len);

		uh->check = 0;



		/* Calculate UDP checksum if configured to do so */

#if IS_ENABLED(CONFIG_IPV6)

		if (sk->sk_family == PF_INET6 && !tunnel->v4mapped)

			l2tp_xmit_ipv6_csum(sk, skb, udp_len);

			udp6_set_csum(udp_get_no_check6_tx(sk),

				      skb, &inet6_sk(sk)->saddr,

				      &sk->sk_v6_daddr, udp_len);

		else

#endif

		if (sk->sk_no_check_tx)

			skb->ip_summed = CHECKSUM_NONE;

		else if ((skb_dst(skb) && skb_dst(skb)->dev) &&

			 (!(skb_dst(skb)->dev->features & NETIF_F_V4_CSUM))) {

			skb->ip_summed = CHECKSUM_COMPLETE;

			csum = skb_checksum(skb, 0, udp_len, 0);

			uh->check = csum_tcpudp_magic(inet->inet_saddr,

						      inet->inet_daddr,

						      udp_len, IPPROTO_UDP, csum);

			if (uh->check == 0)

				uh->check = CSUM_MANGLED_0;

		} else {

			skb->ip_summed = CHECKSUM_PARTIAL;

			skb->csum_start = skb_transport_header(skb) - skb->head;

			skb->csum_offset = offsetof(struct udphdr, check);

			uh->check = ~csum_tcpudp_magic(inet->inet_saddr,

						       inet->inet_daddr,

						       udp_len, IPPROTO_UDP, 0);

		}

		udp_set_csum(sk->sk_no_check_tx, skb, inet->inet_saddr,

			     inet->inet_daddr, udp_len);

		break;



	case L2TP_ENCAPTYPE_IP: