diff options
| author | Tom Herbert <therbert@google.com> | 2014-05-23 08:47:40 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-05-23 16:28:53 -0400 |
| commit | 6b649feafe10b293f4bd5a74aca95faf625ae525 (patch) | |
| tree | 842991b315c84e51fa4c2ececfba60e2992944b9 | |
| parent | 1c19448c9ba6545b80ded18488a64a7f3d8e6998 (diff) | |
l2tp: Add support for zero IPv6 checksums
Added new L2TP configuration options to allow TX and RX of
zero checksums in IPv6. Default is not to use them.
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/uapi/linux/l2tp.h | 2 | ||||
| -rw-r--r-- | net/l2tp/l2tp_core.c | 9 | ||||
| -rw-r--r-- | net/l2tp/l2tp_core.h | 4 | ||||
| -rw-r--r-- | net/l2tp/l2tp_netlink.c | 7 |
4 files changed, 20 insertions, 2 deletions
diff --git a/include/uapi/linux/l2tp.h b/include/uapi/linux/l2tp.h index 8adb6816032..21caa2631c2 100644 --- a/include/uapi/linux/l2tp.h +++ b/include/uapi/linux/l2tp.h @@ -124,6 +124,8 @@ enum { L2TP_ATTR_STATS, /* nested */ L2TP_ATTR_IP6_SADDR, /* struct in6_addr */ L2TP_ATTR_IP6_DADDR, /* struct in6_addr */ + L2TP_ATTR_UDP_ZERO_CSUM6_TX, /* u8 */ + L2TP_ATTR_UDP_ZERO_CSUM6_RX, /* u8 */ __L2TP_ATTR_MAX, }; diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index a1186105f53..379558014b6 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -1102,7 +1102,9 @@ static void l2tp_xmit_ipv6_csum(struct sock *sk, struct sk_buff *skb, struct ipv6_pinfo *np = inet6_sk(sk); struct udphdr *uh = udp_hdr(skb); - if (!skb_dst(skb) || !skb_dst(skb)->dev || + 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; @@ -1435,6 +1437,11 @@ static int l2tp_tunnel_sock_create(struct net *net, sizeof(udp6_addr), 0); if (err < 0) goto out; + + if (cfg->udp6_zero_tx_checksums) + udp_set_no_check6_tx(sock->sk, true); + if (cfg->udp6_zero_rx_checksums) + udp_set_no_check6_rx(sock->sk, true); } else #endif { diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h index 3f93ccd6ba9..68aa9ffd4ae 100644 --- a/net/l2tp/l2tp_core.h +++ b/net/l2tp/l2tp_core.h @@ -162,7 +162,9 @@ struct l2tp_tunnel_cfg { #endif u16 local_udp_port; u16 peer_udp_port; - unsigned int use_udp_checksums:1; + unsigned int use_udp_checksums:1, + udp6_zero_tx_checksums:1, + udp6_zero_rx_checksums:1; }; struct l2tp_tunnel { diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c index f3d331bdd70..0ac907adb2f 100644 --- a/net/l2tp/l2tp_netlink.c +++ b/net/l2tp/l2tp_netlink.c @@ -161,6 +161,13 @@ static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]); if (info->attrs[L2TP_ATTR_UDP_CSUM]) cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]); + +#if IS_ENABLED(CONFIG_IPV6) + if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]) + cfg.udp6_zero_tx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]); + if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]) + cfg.udp6_zero_rx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]); +#endif } if (info->attrs[L2TP_ATTR_DEBUG]) |