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synced 2024-08-23 17:30:02 +00:00
![Jesse Gross](/assets/img/avatar_default.png)
When drivers express support for TSO of encapsulated packets, they
only mean that they can do it for one layer of encapsulation.
Supporting additional levels would mean updating, at a minimum,
more IP length fields and they are unaware of this.
No encapsulation device expresses support for handling offloaded
encapsulated packets, so we won't generate these types of frames
in the transmit path. However, GRO doesn't have a check for
multiple levels of encapsulation and will attempt to build them.
UDP tunnel GRO actually does prevent this situation but it only
handles multiple UDP tunnels stacked on top of each other. This
generalizes that solution to prevent any kind of tunnel stacking
that would cause problems.
Fixes: bf5a755f
("net-gre-gro: Add GRE support to the GRO stack")
Signed-off-by: Jesse Gross <jesse@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
456 lines
12 KiB
C
456 lines
12 KiB
C
/*
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* IPV4 GSO/GRO offload support
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* Linux INET implementation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* UDPv4 GSO support
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*/
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#include <linux/skbuff.h>
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#include <net/udp.h>
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#include <net/protocol.h>
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static DEFINE_SPINLOCK(udp_offload_lock);
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static struct udp_offload_priv __rcu *udp_offload_base __read_mostly;
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#define udp_deref_protected(X) rcu_dereference_protected(X, lockdep_is_held(&udp_offload_lock))
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struct udp_offload_priv {
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struct udp_offload *offload;
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possible_net_t net;
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struct rcu_head rcu;
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struct udp_offload_priv __rcu *next;
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};
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static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
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netdev_features_t features,
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struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb,
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netdev_features_t features),
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__be16 new_protocol, bool is_ipv6)
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{
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int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
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bool remcsum, need_csum, offload_csum, ufo;
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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struct udphdr *uh = udp_hdr(skb);
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u16 mac_offset = skb->mac_header;
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__be16 protocol = skb->protocol;
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u16 mac_len = skb->mac_len;
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int udp_offset, outer_hlen;
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__wsum partial;
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if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
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goto out;
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/* Adjust partial header checksum to negate old length.
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* We cannot rely on the value contained in uh->len as it is
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* possible that the actual value exceeds the boundaries of the
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* 16 bit length field due to the header being added outside of an
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* IP or IPv6 frame that was already limited to 64K - 1.
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*/
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partial = csum_sub(csum_unfold(uh->check),
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(__force __wsum)htonl(skb->len));
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/* setup inner skb. */
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skb->encapsulation = 0;
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__skb_pull(skb, tnl_hlen);
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skb_reset_mac_header(skb);
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skb_set_network_header(skb, skb_inner_network_offset(skb));
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skb->mac_len = skb_inner_network_offset(skb);
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skb->protocol = new_protocol;
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need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM);
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skb->encap_hdr_csum = need_csum;
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remcsum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TUNNEL_REMCSUM);
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skb->remcsum_offload = remcsum;
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ufo = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
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/* Try to offload checksum if possible */
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offload_csum = !!(need_csum &&
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(skb->dev->features &
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(is_ipv6 ? (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM) :
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(NETIF_F_HW_CSUM | NETIF_F_IP_CSUM))));
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features &= skb->dev->hw_enc_features;
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/* The only checksum offload we care about from here on out is the
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* outer one so strip the existing checksum feature flags and
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* instead set the flag based on our outer checksum offload value.
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*/
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if (remcsum || ufo) {
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features &= ~NETIF_F_CSUM_MASK;
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if (!need_csum || offload_csum)
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features |= NETIF_F_HW_CSUM;
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}
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/* segment inner packet. */
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segs = gso_inner_segment(skb, features);
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if (IS_ERR_OR_NULL(segs)) {
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skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset,
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mac_len);
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goto out;
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}
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outer_hlen = skb_tnl_header_len(skb);
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udp_offset = outer_hlen - tnl_hlen;
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skb = segs;
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do {
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__be16 len;
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if (remcsum)
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skb->ip_summed = CHECKSUM_NONE;
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/* Set up inner headers if we are offloading inner checksum */
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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skb_reset_inner_headers(skb);
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skb->encapsulation = 1;
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}
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skb->mac_len = mac_len;
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skb->protocol = protocol;
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__skb_push(skb, outer_hlen);
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skb_reset_mac_header(skb);
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skb_set_network_header(skb, mac_len);
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skb_set_transport_header(skb, udp_offset);
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len = htons(skb->len - udp_offset);
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uh = udp_hdr(skb);
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uh->len = len;
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if (!need_csum)
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continue;
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uh->check = ~csum_fold(csum_add(partial, (__force __wsum)len));
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if (skb->encapsulation || !offload_csum) {
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uh->check = gso_make_checksum(skb, ~uh->check);
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if (uh->check == 0)
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uh->check = CSUM_MANGLED_0;
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} else {
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skb->ip_summed = CHECKSUM_PARTIAL;
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skb->csum_start = skb_transport_header(skb) - skb->head;
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skb->csum_offset = offsetof(struct udphdr, check);
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}
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} while ((skb = skb->next));
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out:
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return segs;
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}
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struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
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netdev_features_t features,
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bool is_ipv6)
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{
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__be16 protocol = skb->protocol;
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const struct net_offload **offloads;
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const struct net_offload *ops;
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb,
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netdev_features_t features);
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rcu_read_lock();
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switch (skb->inner_protocol_type) {
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case ENCAP_TYPE_ETHER:
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protocol = skb->inner_protocol;
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gso_inner_segment = skb_mac_gso_segment;
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break;
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case ENCAP_TYPE_IPPROTO:
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offloads = is_ipv6 ? inet6_offloads : inet_offloads;
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ops = rcu_dereference(offloads[skb->inner_ipproto]);
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if (!ops || !ops->callbacks.gso_segment)
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goto out_unlock;
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gso_inner_segment = ops->callbacks.gso_segment;
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break;
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default:
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goto out_unlock;
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}
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segs = __skb_udp_tunnel_segment(skb, features, gso_inner_segment,
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protocol, is_ipv6);
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out_unlock:
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rcu_read_unlock();
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return segs;
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}
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static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
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netdev_features_t features)
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{
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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unsigned int mss;
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__wsum csum;
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struct udphdr *uh;
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struct iphdr *iph;
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if (skb->encapsulation &&
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(skb_shinfo(skb)->gso_type &
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(SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))) {
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segs = skb_udp_tunnel_segment(skb, features, false);
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goto out;
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}
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if (!pskb_may_pull(skb, sizeof(struct udphdr)))
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goto out;
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mss = skb_shinfo(skb)->gso_size;
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if (unlikely(skb->len <= mss))
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goto out;
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if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
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/* Packet is from an untrusted source, reset gso_segs. */
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int type = skb_shinfo(skb)->gso_type;
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if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY |
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SKB_GSO_UDP_TUNNEL |
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SKB_GSO_UDP_TUNNEL_CSUM |
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SKB_GSO_TUNNEL_REMCSUM |
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SKB_GSO_IPIP |
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SKB_GSO_GRE | SKB_GSO_GRE_CSUM) ||
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!(type & (SKB_GSO_UDP))))
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goto out;
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skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
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segs = NULL;
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goto out;
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}
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/* Do software UFO. Complete and fill in the UDP checksum as
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* HW cannot do checksum of UDP packets sent as multiple
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* IP fragments.
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*/
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uh = udp_hdr(skb);
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iph = ip_hdr(skb);
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uh->check = 0;
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csum = skb_checksum(skb, 0, skb->len, 0);
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uh->check = udp_v4_check(skb->len, iph->saddr, iph->daddr, csum);
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if (uh->check == 0)
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uh->check = CSUM_MANGLED_0;
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skb->ip_summed = CHECKSUM_NONE;
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/* If there is no outer header we can fake a checksum offload
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* due to the fact that we have already done the checksum in
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* software prior to segmenting the frame.
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*/
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if (!skb->encap_hdr_csum)
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features |= NETIF_F_HW_CSUM;
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/* Fragment the skb. IP headers of the fragments are updated in
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* inet_gso_segment()
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*/
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segs = skb_segment(skb, features);
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out:
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return segs;
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}
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int udp_add_offload(struct net *net, struct udp_offload *uo)
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{
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struct udp_offload_priv *new_offload = kzalloc(sizeof(*new_offload), GFP_ATOMIC);
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if (!new_offload)
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return -ENOMEM;
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write_pnet(&new_offload->net, net);
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new_offload->offload = uo;
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spin_lock(&udp_offload_lock);
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new_offload->next = udp_offload_base;
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rcu_assign_pointer(udp_offload_base, new_offload);
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spin_unlock(&udp_offload_lock);
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return 0;
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}
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EXPORT_SYMBOL(udp_add_offload);
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static void udp_offload_free_routine(struct rcu_head *head)
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{
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struct udp_offload_priv *ou_priv = container_of(head, struct udp_offload_priv, rcu);
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kfree(ou_priv);
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}
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void udp_del_offload(struct udp_offload *uo)
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{
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struct udp_offload_priv __rcu **head = &udp_offload_base;
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struct udp_offload_priv *uo_priv;
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spin_lock(&udp_offload_lock);
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uo_priv = udp_deref_protected(*head);
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for (; uo_priv != NULL;
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uo_priv = udp_deref_protected(*head)) {
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if (uo_priv->offload == uo) {
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rcu_assign_pointer(*head,
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udp_deref_protected(uo_priv->next));
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goto unlock;
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}
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head = &uo_priv->next;
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}
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pr_warn("udp_del_offload: didn't find offload for port %d\n", ntohs(uo->port));
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unlock:
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spin_unlock(&udp_offload_lock);
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if (uo_priv)
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call_rcu(&uo_priv->rcu, udp_offload_free_routine);
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}
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EXPORT_SYMBOL(udp_del_offload);
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struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
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struct udphdr *uh)
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{
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struct udp_offload_priv *uo_priv;
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struct sk_buff *p, **pp = NULL;
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struct udphdr *uh2;
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unsigned int off = skb_gro_offset(skb);
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int flush = 1;
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if (NAPI_GRO_CB(skb)->encap_mark ||
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(skb->ip_summed != CHECKSUM_PARTIAL &&
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NAPI_GRO_CB(skb)->csum_cnt == 0 &&
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!NAPI_GRO_CB(skb)->csum_valid))
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goto out;
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/* mark that this skb passed once through the tunnel gro layer */
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NAPI_GRO_CB(skb)->encap_mark = 1;
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rcu_read_lock();
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uo_priv = rcu_dereference(udp_offload_base);
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for (; uo_priv != NULL; uo_priv = rcu_dereference(uo_priv->next)) {
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if (net_eq(read_pnet(&uo_priv->net), dev_net(skb->dev)) &&
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uo_priv->offload->port == uh->dest &&
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uo_priv->offload->callbacks.gro_receive)
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goto unflush;
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}
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goto out_unlock;
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unflush:
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flush = 0;
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for (p = *head; p; p = p->next) {
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if (!NAPI_GRO_CB(p)->same_flow)
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continue;
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uh2 = (struct udphdr *)(p->data + off);
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/* Match ports and either checksums are either both zero
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* or nonzero.
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*/
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if ((*(u32 *)&uh->source != *(u32 *)&uh2->source) ||
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(!uh->check ^ !uh2->check)) {
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NAPI_GRO_CB(p)->same_flow = 0;
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continue;
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}
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}
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skb_gro_pull(skb, sizeof(struct udphdr)); /* pull encapsulating udp header */
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skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr));
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NAPI_GRO_CB(skb)->proto = uo_priv->offload->ipproto;
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pp = uo_priv->offload->callbacks.gro_receive(head, skb,
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uo_priv->offload);
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out_unlock:
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rcu_read_unlock();
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out:
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NAPI_GRO_CB(skb)->flush |= flush;
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return pp;
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}
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static struct sk_buff **udp4_gro_receive(struct sk_buff **head,
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struct sk_buff *skb)
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{
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struct udphdr *uh = udp_gro_udphdr(skb);
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if (unlikely(!uh))
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goto flush;
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/* Don't bother verifying checksum if we're going to flush anyway. */
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if (NAPI_GRO_CB(skb)->flush)
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goto skip;
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if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
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inet_gro_compute_pseudo))
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goto flush;
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else if (uh->check)
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skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
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inet_gro_compute_pseudo);
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skip:
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NAPI_GRO_CB(skb)->is_ipv6 = 0;
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return udp_gro_receive(head, skb, uh);
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flush:
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NAPI_GRO_CB(skb)->flush = 1;
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return NULL;
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}
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int udp_gro_complete(struct sk_buff *skb, int nhoff)
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{
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struct udp_offload_priv *uo_priv;
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__be16 newlen = htons(skb->len - nhoff);
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struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
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int err = -ENOSYS;
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uh->len = newlen;
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rcu_read_lock();
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uo_priv = rcu_dereference(udp_offload_base);
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for (; uo_priv != NULL; uo_priv = rcu_dereference(uo_priv->next)) {
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if (net_eq(read_pnet(&uo_priv->net), dev_net(skb->dev)) &&
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uo_priv->offload->port == uh->dest &&
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uo_priv->offload->callbacks.gro_complete)
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break;
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}
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if (uo_priv) {
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NAPI_GRO_CB(skb)->proto = uo_priv->offload->ipproto;
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err = uo_priv->offload->callbacks.gro_complete(skb,
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nhoff + sizeof(struct udphdr),
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uo_priv->offload);
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}
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rcu_read_unlock();
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if (skb->remcsum_offload)
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skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM;
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skb->encapsulation = 1;
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skb_set_inner_mac_header(skb, nhoff + sizeof(struct udphdr));
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return err;
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}
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static int udp4_gro_complete(struct sk_buff *skb, int nhoff)
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{
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const struct iphdr *iph = ip_hdr(skb);
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struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
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if (uh->check) {
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skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
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uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,
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iph->daddr, 0);
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} else {
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skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
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}
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return udp_gro_complete(skb, nhoff);
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}
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static const struct net_offload udpv4_offload = {
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.callbacks = {
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.gso_segment = udp4_ufo_fragment,
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.gro_receive = udp4_gro_receive,
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.gro_complete = udp4_gro_complete,
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},
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};
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int __init udpv4_offload_init(void)
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{
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return inet_add_offload(&udpv4_offload, IPPROTO_UDP);
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}
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