/* * IPV6 GSO/GRO offload support * Linux INET6 implementation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * UDPv6 GSO support */ #include <linux/skbuff.h> #include <linux/netdevice.h> #include <net/protocol.h> #include <net/ipv6.h> #include <net/udp.h> #include <net/ip6_checksum.h> #include "ip6_offload.h" static struct sk_buff *udp6_tunnel_segment(struct sk_buff *skb, netdev_features_t features) { struct sk_buff *segs = ERR_PTR(-EINVAL); if (skb->encapsulation && skb_shinfo(skb)->gso_type & (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM)) segs = skb_udp_tunnel_segment(skb, features, true); return segs; } static struct sk_buff **udp6_gro_receive(struct sk_buff **head, struct sk_buff *skb) { struct udphdr *uh = udp_gro_udphdr(skb); 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, ip6_gro_compute_pseudo)) goto flush; else if (uh->check) skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check, ip6_gro_compute_pseudo); skip: NAPI_GRO_CB(skb)->is_ipv6 = 1; return udp_gro_receive(head, skb, uh, udp6_lib_lookup_skb); flush: NAPI_GRO_CB(skb)->flush = 1; return NULL; } static int udp6_gro_complete(struct sk_buff *skb, int nhoff) { const struct ipv6hdr *ipv6h = ipv6_hdr(skb); struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); if (uh->check) { skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr, &ipv6h->daddr, 0); } else { skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; } return udp_gro_complete(skb, nhoff, udp6_lib_lookup_skb); } static const struct net_offload udpv6_offload = { .callbacks = { .gso_segment = udp6_tunnel_segment, .gro_receive = udp6_gro_receive, .gro_complete = udp6_gro_complete, }, }; int udpv6_offload_init(void) { return inet6_add_offload(&udpv6_offload, IPPROTO_UDP); } int udpv6_offload_exit(void) { return inet6_del_offload(&udpv6_offload, IPPROTO_UDP); }