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703 lines
18 KiB
703 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* IPV4 GSO/GRO offload support |
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* Linux INET implementation |
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* |
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* UDPv4 GSO support |
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*/ |
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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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#include <net/inet_common.h> |
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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, 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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|
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if (unlikely(!pskb_may_pull(skb, tnl_hlen))) |
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goto out; |
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|
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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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|
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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_set_transport_header(skb, skb_inner_transport_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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|
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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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|
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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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if (need_csum) |
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features &= ~NETIF_F_SCTP_CRC; |
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|
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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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|
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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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|
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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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|
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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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|
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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 && skb_is_gso(skb)) { |
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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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|
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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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|
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rcu_read_lock(); |
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|
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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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|
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return segs; |
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} |
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EXPORT_SYMBOL(skb_udp_tunnel_segment); |
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|
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static void __udpv4_gso_segment_csum(struct sk_buff *seg, |
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__be32 *oldip, __be32 *newip, |
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__be16 *oldport, __be16 *newport) |
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{ |
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struct udphdr *uh; |
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struct iphdr *iph; |
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if (*oldip == *newip && *oldport == *newport) |
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return; |
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uh = udp_hdr(seg); |
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iph = ip_hdr(seg); |
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if (uh->check) { |
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inet_proto_csum_replace4(&uh->check, seg, *oldip, *newip, |
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true); |
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inet_proto_csum_replace2(&uh->check, seg, *oldport, *newport, |
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false); |
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if (!uh->check) |
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uh->check = CSUM_MANGLED_0; |
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} |
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*oldport = *newport; |
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csum_replace4(&iph->check, *oldip, *newip); |
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*oldip = *newip; |
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} |
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static struct sk_buff *__udpv4_gso_segment_list_csum(struct sk_buff *segs) |
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{ |
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struct sk_buff *seg; |
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struct udphdr *uh, *uh2; |
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struct iphdr *iph, *iph2; |
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seg = segs; |
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uh = udp_hdr(seg); |
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iph = ip_hdr(seg); |
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if ((udp_hdr(seg)->dest == udp_hdr(seg->next)->dest) && |
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(udp_hdr(seg)->source == udp_hdr(seg->next)->source) && |
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(ip_hdr(seg)->daddr == ip_hdr(seg->next)->daddr) && |
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(ip_hdr(seg)->saddr == ip_hdr(seg->next)->saddr)) |
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return segs; |
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while ((seg = seg->next)) { |
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uh2 = udp_hdr(seg); |
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iph2 = ip_hdr(seg); |
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__udpv4_gso_segment_csum(seg, |
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&iph2->saddr, &iph->saddr, |
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&uh2->source, &uh->source); |
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__udpv4_gso_segment_csum(seg, |
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&iph2->daddr, &iph->daddr, |
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&uh2->dest, &uh->dest); |
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} |
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return segs; |
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} |
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static struct sk_buff *__udp_gso_segment_list(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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unsigned int mss = skb_shinfo(skb)->gso_size; |
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skb = skb_segment_list(skb, features, skb_mac_header_len(skb)); |
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if (IS_ERR(skb)) |
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return skb; |
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udp_hdr(skb)->len = htons(sizeof(struct udphdr) + mss); |
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return is_ipv6 ? skb : __udpv4_gso_segment_list_csum(skb); |
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} |
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struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb, |
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netdev_features_t features, bool is_ipv6) |
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{ |
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struct sock *sk = gso_skb->sk; |
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unsigned int sum_truesize = 0; |
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struct sk_buff *segs, *seg; |
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struct udphdr *uh; |
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unsigned int mss; |
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bool copy_dtor; |
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__sum16 check; |
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__be16 newlen; |
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if (skb_shinfo(gso_skb)->gso_type & SKB_GSO_FRAGLIST) |
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return __udp_gso_segment_list(gso_skb, features, is_ipv6); |
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mss = skb_shinfo(gso_skb)->gso_size; |
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if (gso_skb->len <= sizeof(*uh) + mss) |
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return ERR_PTR(-EINVAL); |
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skb_pull(gso_skb, sizeof(*uh)); |
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|
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/* clear destructor to avoid skb_segment assigning it to tail */ |
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copy_dtor = gso_skb->destructor == sock_wfree; |
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if (copy_dtor) |
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gso_skb->destructor = NULL; |
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segs = skb_segment(gso_skb, features); |
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if (IS_ERR_OR_NULL(segs)) { |
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if (copy_dtor) |
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gso_skb->destructor = sock_wfree; |
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return segs; |
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} |
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/* GSO partial and frag_list segmentation only requires splitting |
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* the frame into an MSS multiple and possibly a remainder, both |
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* cases return a GSO skb. So update the mss now. |
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*/ |
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if (skb_is_gso(segs)) |
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mss *= skb_shinfo(segs)->gso_segs; |
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seg = segs; |
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uh = udp_hdr(seg); |
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|
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/* preserve TX timestamp flags and TS key for first segment */ |
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skb_shinfo(seg)->tskey = skb_shinfo(gso_skb)->tskey; |
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skb_shinfo(seg)->tx_flags |= |
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(skb_shinfo(gso_skb)->tx_flags & SKBTX_ANY_TSTAMP); |
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|
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/* compute checksum adjustment based on old length versus new */ |
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newlen = htons(sizeof(*uh) + mss); |
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check = csum16_add(csum16_sub(uh->check, uh->len), newlen); |
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for (;;) { |
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if (copy_dtor) { |
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seg->destructor = sock_wfree; |
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seg->sk = sk; |
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sum_truesize += seg->truesize; |
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} |
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if (!seg->next) |
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break; |
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uh->len = newlen; |
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uh->check = check; |
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|
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if (seg->ip_summed == CHECKSUM_PARTIAL) |
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gso_reset_checksum(seg, ~check); |
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else |
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uh->check = gso_make_checksum(seg, ~check) ? : |
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CSUM_MANGLED_0; |
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|
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seg = seg->next; |
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uh = udp_hdr(seg); |
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} |
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/* last packet can be partial gso_size, account for that in checksum */ |
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newlen = htons(skb_tail_pointer(seg) - skb_transport_header(seg) + |
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seg->data_len); |
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check = csum16_add(csum16_sub(uh->check, uh->len), newlen); |
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uh->len = newlen; |
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uh->check = check; |
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if (seg->ip_summed == CHECKSUM_PARTIAL) |
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gso_reset_checksum(seg, ~check); |
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else |
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uh->check = gso_make_checksum(seg, ~check) ? : CSUM_MANGLED_0; |
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|
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/* update refcount for the packet */ |
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if (copy_dtor) { |
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int delta = sum_truesize - gso_skb->truesize; |
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|
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/* In some pathological cases, delta can be negative. |
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* We need to either use refcount_add() or refcount_sub_and_test() |
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*/ |
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if (likely(delta >= 0)) |
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refcount_add(delta, &sk->sk_wmem_alloc); |
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else |
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WARN_ON_ONCE(refcount_sub_and_test(-delta, &sk->sk_wmem_alloc)); |
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} |
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return segs; |
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} |
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EXPORT_SYMBOL_GPL(__udp_gso_segment); |
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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 (!(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP | SKB_GSO_UDP_L4))) |
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goto out; |
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if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
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goto out; |
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if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) |
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return __udp_gso_segment(skb, features, false); |
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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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/* 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_UNNECESSARY; |
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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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|
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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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#define UDP_GRO_CNT_MAX 64 |
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static struct sk_buff *udp_gro_receive_segment(struct list_head *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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struct sk_buff *pp = NULL; |
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struct udphdr *uh2; |
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struct sk_buff *p; |
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unsigned int ulen; |
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int ret = 0; |
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|
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/* requires non zero csum, for symmetry with GSO */ |
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if (!uh->check) { |
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NAPI_GRO_CB(skb)->flush = 1; |
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return NULL; |
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} |
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|
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/* Do not deal with padded or malicious packets, sorry ! */ |
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ulen = ntohs(uh->len); |
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if (ulen <= sizeof(*uh) || ulen != skb_gro_len(skb)) { |
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NAPI_GRO_CB(skb)->flush = 1; |
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return NULL; |
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} |
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/* pull encapsulating udp header */ |
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skb_gro_pull(skb, sizeof(struct udphdr)); |
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|
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list_for_each_entry(p, head, list) { |
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if (!NAPI_GRO_CB(p)->same_flow) |
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continue; |
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|
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uh2 = udp_hdr(p); |
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|
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/* Match ports only, as csum is always non zero */ |
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if ((*(u32 *)&uh->source != *(u32 *)&uh2->source)) { |
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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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if (NAPI_GRO_CB(skb)->is_flist != NAPI_GRO_CB(p)->is_flist) { |
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NAPI_GRO_CB(skb)->flush = 1; |
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return p; |
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} |
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|
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/* Terminate the flow on len mismatch or if it grow "too much". |
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* Under small packet flood GRO count could elsewhere grow a lot |
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* leading to excessive truesize values. |
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* On len mismatch merge the first packet shorter than gso_size, |
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* otherwise complete the GRO packet. |
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*/ |
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if (ulen > ntohs(uh2->len)) { |
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pp = p; |
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} else { |
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if (NAPI_GRO_CB(skb)->is_flist) { |
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if (!pskb_may_pull(skb, skb_gro_offset(skb))) { |
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NAPI_GRO_CB(skb)->flush = 1; |
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return NULL; |
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} |
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if ((skb->ip_summed != p->ip_summed) || |
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(skb->csum_level != p->csum_level)) { |
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NAPI_GRO_CB(skb)->flush = 1; |
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return NULL; |
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} |
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ret = skb_gro_receive_list(p, skb); |
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} else { |
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skb_gro_postpull_rcsum(skb, uh, |
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sizeof(struct udphdr)); |
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|
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ret = skb_gro_receive(p, skb); |
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} |
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} |
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|
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if (ret || ulen != ntohs(uh2->len) || |
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NAPI_GRO_CB(p)->count >= UDP_GRO_CNT_MAX) |
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pp = p; |
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|
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return pp; |
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} |
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|
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/* mismatch, but we never need to flush */ |
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return NULL; |
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} |
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|
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struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb, |
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struct udphdr *uh, struct sock *sk) |
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{ |
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struct sk_buff *pp = NULL; |
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struct sk_buff *p; |
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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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|
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/* we can do L4 aggregation only if the packet can't land in a tunnel |
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* otherwise we could corrupt the inner stream |
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*/ |
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NAPI_GRO_CB(skb)->is_flist = 0; |
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if (!sk || !udp_sk(sk)->gro_receive) { |
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if (skb->dev->features & NETIF_F_GRO_FRAGLIST) |
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NAPI_GRO_CB(skb)->is_flist = sk ? !udp_sk(sk)->gro_enabled : 1; |
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|
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if ((!sk && (skb->dev->features & NETIF_F_GRO_UDP_FWD)) || |
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(sk && udp_sk(sk)->gro_enabled) || NAPI_GRO_CB(skb)->is_flist) |
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pp = call_gro_receive(udp_gro_receive_segment, head, skb); |
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return pp; |
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} |
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|
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if (NAPI_GRO_CB(skb)->encap_mark || |
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(uh->check && skb->ip_summed != CHECKSUM_PARTIAL && |
|
NAPI_GRO_CB(skb)->csum_cnt == 0 && |
|
!NAPI_GRO_CB(skb)->csum_valid)) |
|
goto out; |
|
|
|
/* mark that this skb passed once through the tunnel gro layer */ |
|
NAPI_GRO_CB(skb)->encap_mark = 1; |
|
|
|
flush = 0; |
|
|
|
list_for_each_entry(p, head, list) { |
|
if (!NAPI_GRO_CB(p)->same_flow) |
|
continue; |
|
|
|
uh2 = (struct udphdr *)(p->data + off); |
|
|
|
/* Match ports and either checksums are either both zero |
|
* or nonzero. |
|
*/ |
|
if ((*(u32 *)&uh->source != *(u32 *)&uh2->source) || |
|
(!uh->check ^ !uh2->check)) { |
|
NAPI_GRO_CB(p)->same_flow = 0; |
|
continue; |
|
} |
|
} |
|
|
|
skb_gro_pull(skb, sizeof(struct udphdr)); /* pull encapsulating udp header */ |
|
skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr)); |
|
pp = call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb); |
|
|
|
out: |
|
skb_gro_flush_final(skb, pp, flush); |
|
return pp; |
|
} |
|
EXPORT_SYMBOL(udp_gro_receive); |
|
|
|
static struct sock *udp4_gro_lookup_skb(struct sk_buff *skb, __be16 sport, |
|
__be16 dport) |
|
{ |
|
const struct iphdr *iph = skb_gro_network_header(skb); |
|
|
|
return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport, |
|
iph->daddr, dport, inet_iif(skb), |
|
inet_sdif(skb), &udp_table, NULL); |
|
} |
|
|
|
INDIRECT_CALLABLE_SCOPE |
|
struct sk_buff *udp4_gro_receive(struct list_head *head, struct sk_buff *skb) |
|
{ |
|
struct udphdr *uh = udp_gro_udphdr(skb); |
|
struct sock *sk = NULL; |
|
struct sk_buff *pp; |
|
|
|
if (unlikely(!uh)) |
|
goto flush; |
|
|
|
/* Don't bother verifying checksum if we're going to flush anyway. */ |
|
if (NAPI_GRO_CB(skb)->flush) |
|
goto skip; |
|
|
|
if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check, |
|
inet_gro_compute_pseudo)) |
|
goto flush; |
|
else if (uh->check) |
|
skb_gro_checksum_try_convert(skb, IPPROTO_UDP, |
|
inet_gro_compute_pseudo); |
|
skip: |
|
NAPI_GRO_CB(skb)->is_ipv6 = 0; |
|
rcu_read_lock(); |
|
|
|
if (static_branch_unlikely(&udp_encap_needed_key)) |
|
sk = udp4_gro_lookup_skb(skb, uh->source, uh->dest); |
|
|
|
pp = udp_gro_receive(head, skb, uh, sk); |
|
rcu_read_unlock(); |
|
return pp; |
|
|
|
flush: |
|
NAPI_GRO_CB(skb)->flush = 1; |
|
return NULL; |
|
} |
|
|
|
static int udp_gro_complete_segment(struct sk_buff *skb) |
|
{ |
|
struct udphdr *uh = udp_hdr(skb); |
|
|
|
skb->csum_start = (unsigned char *)uh - skb->head; |
|
skb->csum_offset = offsetof(struct udphdr, check); |
|
skb->ip_summed = CHECKSUM_PARTIAL; |
|
|
|
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count; |
|
skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_L4; |
|
return 0; |
|
} |
|
|
|
int udp_gro_complete(struct sk_buff *skb, int nhoff, |
|
udp_lookup_t lookup) |
|
{ |
|
__be16 newlen = htons(skb->len - nhoff); |
|
struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); |
|
struct sock *sk; |
|
int err; |
|
|
|
uh->len = newlen; |
|
|
|
rcu_read_lock(); |
|
sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb, |
|
udp4_lib_lookup_skb, skb, uh->source, uh->dest); |
|
if (sk && udp_sk(sk)->gro_complete) { |
|
skb_shinfo(skb)->gso_type = uh->check ? SKB_GSO_UDP_TUNNEL_CSUM |
|
: SKB_GSO_UDP_TUNNEL; |
|
|
|
/* Set encapsulation before calling into inner gro_complete() |
|
* functions to make them set up the inner offsets. |
|
*/ |
|
skb->encapsulation = 1; |
|
err = udp_sk(sk)->gro_complete(sk, skb, |
|
nhoff + sizeof(struct udphdr)); |
|
} else { |
|
err = udp_gro_complete_segment(skb); |
|
} |
|
rcu_read_unlock(); |
|
|
|
if (skb->remcsum_offload) |
|
skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM; |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL(udp_gro_complete); |
|
|
|
INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff) |
|
{ |
|
const struct iphdr *iph = ip_hdr(skb); |
|
struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); |
|
|
|
if (NAPI_GRO_CB(skb)->is_flist) { |
|
uh->len = htons(skb->len - nhoff); |
|
|
|
skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4); |
|
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count; |
|
|
|
if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
|
if (skb->csum_level < SKB_MAX_CSUM_LEVEL) |
|
skb->csum_level++; |
|
} else { |
|
skb->ip_summed = CHECKSUM_UNNECESSARY; |
|
skb->csum_level = 0; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
if (uh->check) |
|
uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr, |
|
iph->daddr, 0); |
|
|
|
return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb); |
|
} |
|
|
|
static const struct net_offload udpv4_offload = { |
|
.callbacks = { |
|
.gso_segment = udp4_ufo_fragment, |
|
.gro_receive = udp4_gro_receive, |
|
.gro_complete = udp4_gro_complete, |
|
}, |
|
}; |
|
|
|
int __init udpv4_offload_init(void) |
|
{ |
|
return inet_add_offload(&udpv4_offload, IPPROTO_UDP); |
|
}
|
|
|