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bef3c6c937
The enc_features variable isn't necessary since features isn't used anywhere after we create enc_features so instead just use a destructive AND on features itself and save ourselves the variable declaration. Signed-off-by: Alexander Duyck <aduyck@mirantis.com> Acked-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
448 lines
11 KiB
C
448 lines
11 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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struct sk_buff *segs = ERR_PTR(-EINVAL);
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u16 mac_offset = skb->mac_header;
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int mac_len = skb->mac_len;
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int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
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__be16 protocol = skb->protocol;
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int udp_offset, outer_hlen;
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unsigned int oldlen;
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bool need_csum = !!(skb_shinfo(skb)->gso_type &
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SKB_GSO_UDP_TUNNEL_CSUM);
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bool remcsum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TUNNEL_REMCSUM);
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bool offload_csum = false, dont_encap = (need_csum || remcsum);
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oldlen = (u16)~skb->len;
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if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
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goto out;
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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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skb->encap_hdr_csum = need_csum;
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skb->remcsum_offload = remcsum;
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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 & NETIF_F_HW_CSUM) ||
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(skb->dev->features & (is_ipv6 ?
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NETIF_F_IPV6_CSUM : NETIF_F_IP_CSUM))));
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features &= skb->dev->hw_enc_features;
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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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struct udphdr *uh;
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int len;
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__be32 delta;
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if (dont_encap) {
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skb->encapsulation = 0;
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skb->ip_summed = CHECKSUM_NONE;
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} else {
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/* Only set up inner headers if we might be offloading
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* inner checksum.
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*/
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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 = skb->len - udp_offset;
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uh = udp_hdr(skb);
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uh->len = htons(len);
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if (!need_csum)
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continue;
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delta = htonl(oldlen + len);
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uh->check = ~csum_fold((__force __wsum)
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((__force u32)uh->check +
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(__force u32)delta));
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if (offload_csum) {
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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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} else if (remcsum) {
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/* Need to calculate checksum from scratch,
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* inner checksums are never when doing
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* remote_checksum_offload.
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*/
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skb->csum = skb_checksum(skb, udp_offset,
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skb->len - udp_offset,
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0);
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uh->check = csum_fold(skb->csum);
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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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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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}
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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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/* 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)->udp_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 udp gro layer */
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NAPI_GRO_CB(skb)->udp_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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