diff options
Diffstat (limited to 'net/l2tp/l2tp_core.c')
| -rw-r--r-- | net/l2tp/l2tp_core.c | 89 |
1 files changed, 77 insertions, 12 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index f6732b6c758b..e91d55924d94 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -53,6 +53,9 @@ #include <net/inet_common.h> #include <net/xfrm.h> #include <net/protocol.h> +#include <net/inet6_connection_sock.h> +#include <net/inet_ecn.h> +#include <net/ip6_route.h> #include <asm/byteorder.h> #include <linux/atomic.h> @@ -446,21 +449,43 @@ static inline int l2tp_verify_udp_checksum(struct sock *sk, { struct udphdr *uh = udp_hdr(skb); u16 ulen = ntohs(uh->len); - struct inet_sock *inet; __wsum psum; - if (sk->sk_no_check || skb_csum_unnecessary(skb) || !uh->check) - return 0; - - inet = inet_sk(sk); - psum = csum_tcpudp_nofold(inet->inet_saddr, inet->inet_daddr, ulen, - IPPROTO_UDP, 0); - - if ((skb->ip_summed == CHECKSUM_COMPLETE) && - !csum_fold(csum_add(psum, skb->csum))) + if (sk->sk_no_check || skb_csum_unnecessary(skb)) return 0; - skb->csum = psum; +#if IS_ENABLED(CONFIG_IPV6) + if (sk->sk_family == PF_INET6) { + if (!uh->check) { + LIMIT_NETDEBUG(KERN_INFO "L2TP: IPv6: checksum is 0\n"); + return 1; + } + if ((skb->ip_summed == CHECKSUM_COMPLETE) && + !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, + &ipv6_hdr(skb)->daddr, ulen, + IPPROTO_UDP, skb->csum)) { + skb->ip_summed = CHECKSUM_UNNECESSARY; + return 0; + } + skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, + &ipv6_hdr(skb)->daddr, + skb->len, IPPROTO_UDP, + 0)); + } else +#endif + { + struct inet_sock *inet; + if (!uh->check) + return 0; + inet = inet_sk(sk); + psum = csum_tcpudp_nofold(inet->inet_saddr, inet->inet_daddr, + ulen, IPPROTO_UDP, 0); + + if ((skb->ip_summed == CHECKSUM_COMPLETE) && + !csum_fold(csum_add(psum, skb->csum))) + return 0; + skb->csum = psum; + } return __skb_checksum_complete(skb); } @@ -988,7 +1013,12 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb, /* Queue the packet to IP for output */ skb->local_df = 1; - error = ip_queue_xmit(skb, fl); +#if IS_ENABLED(CONFIG_IPV6) + if (skb->sk->sk_family == PF_INET6) + error = inet6_csk_xmit(skb, NULL); + else +#endif + error = ip_queue_xmit(skb, fl); /* Update stats */ if (error >= 0) { @@ -1021,6 +1051,31 @@ static inline void l2tp_skb_set_owner_w(struct sk_buff *skb, struct sock *sk) skb->destructor = l2tp_sock_wfree; } +#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 (!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, &np->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, &np->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. */ @@ -1089,6 +1144,11 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len uh->check = 0; /* Calculate UDP checksum if configured to do so */ +#if IS_ENABLED(CONFIG_IPV6) + if (sk->sk_family == PF_INET6) + l2tp_xmit_ipv6_csum(sk, skb, udp_len); + else +#endif if (sk->sk_no_check == UDP_CSUM_NOXMIT) skb->ip_summed = CHECKSUM_NONE; else if ((skb_dst(skb) && skb_dst(skb)->dev) && @@ -1424,6 +1484,11 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32 /* Mark socket as an encapsulation socket. See net/ipv4/udp.c */ udp_sk(sk)->encap_type = UDP_ENCAP_L2TPINUDP; udp_sk(sk)->encap_rcv = l2tp_udp_encap_recv; +#if IS_ENABLED(CONFIG_IPV6) + if (sk->sk_family == PF_INET6) + udpv6_encap_enable(); + else +#endif udp_encap_enable(); } |