mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 16:36:58 +07:00
880388aa3c
Such packets are no longer possible. Signed-off-by: David S. Miller <davem@davemloft.net>
393 lines
10 KiB
C
393 lines
10 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 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, gso_partial;
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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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bool need_ipsec;
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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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if (skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)
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partial = (__force __wsum)uh->len;
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else
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partial = (__force __wsum)htonl(skb->len);
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partial = csum_sub(csum_unfold(uh->check), partial);
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/* setup inner skb. */
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skb->encapsulation = 0;
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SKB_GSO_CB(skb)->encap_level = 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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need_ipsec = skb_dst(skb) && dst_xfrm(skb_dst(skb));
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/* Try to offload checksum if possible */
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offload_csum = !!(need_csum &&
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!need_ipsec &&
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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) {
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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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gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
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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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unsigned int 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 = skb->len - udp_offset;
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uh = udp_hdr(skb);
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/* If we are only performing partial GSO the inner header
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* will be using a length value equal to only one MSS sized
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* segment instead of the entire frame.
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*/
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if (gso_partial) {
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uh->len = htons(skb_shinfo(skb)->gso_size +
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SKB_GSO_CB(skb)->data_offset +
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skb->head - (unsigned char *)uh);
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} else {
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uh->len = htons(len);
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}
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if (!need_csum)
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continue;
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uh->check = ~csum_fold(csum_add(partial,
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(__force __wsum)htonl(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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EXPORT_SYMBOL(skb_udp_tunnel_segment);
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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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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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struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
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struct udphdr *uh, udp_lookup_t lookup)
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{
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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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struct sock *sk;
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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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sk = (*lookup)(skb, uh->source, uh->dest);
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if (sk && udp_sk(sk)->gro_receive)
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goto unflush;
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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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pp = call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb);
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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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EXPORT_SYMBOL(udp_gro_receive);
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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, udp4_lib_lookup_skb);
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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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udp_lookup_t lookup)
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{
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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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struct sock *sk;
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uh->len = newlen;
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/* Set encapsulation before calling into inner gro_complete() functions
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* to make them set up the inner offsets.
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*/
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skb->encapsulation = 1;
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rcu_read_lock();
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sk = (*lookup)(skb, uh->source, uh->dest);
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if (sk && udp_sk(sk)->gro_complete)
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err = udp_sk(sk)->gro_complete(sk, skb,
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nhoff + sizeof(struct udphdr));
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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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return err;
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}
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EXPORT_SYMBOL(udp_gro_complete);
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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, udp4_lib_lookup_skb);
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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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