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l2tp: call udp{6}_set_csum

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Call common functions to set checksum for UDP tunnel.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2014-06-04 17:19:56 -07:00 committed by David S. Miller
parent af5fcba7f3
commit 77157e1973
1 changed files with 5 additions and 49 deletions
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54
net/l2tp/l2tp_core.c
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@ -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: