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![David Miller](/assets/img/avatar_default.png)
Manage pending per-NAPI GRO packets via list_head. Return an SKB pointer from the GRO receive handlers. When GRO receive handlers return non-NULL, it means that this SKB needs to be completed at this time and removed from the NAPI queue. Several operations are greatly simplified by this transformation, especially timing out the oldest SKB in the list when gro_count exceeds MAX_GRO_SKBS, and napi_gro_flush() which walks the queue in reverse order. Signed-off-by: David S. Miller <davem@davemloft.net>
177 lines
4.7 KiB
C
177 lines
4.7 KiB
C
/*
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* IPV6 GSO/GRO offload support
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* Linux INET6 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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* UDPv6 GSO support
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*/
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <net/protocol.h>
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#include <net/ipv6.h>
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#include <net/udp.h>
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#include <net/ip6_checksum.h>
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#include "ip6_offload.h"
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static struct sk_buff *udp6_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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unsigned int unfrag_ip6hlen, unfrag_len;
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struct frag_hdr *fptr;
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u8 *packet_start, *prevhdr;
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u8 nexthdr;
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u8 frag_hdr_sz = sizeof(struct frag_hdr);
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__wsum csum;
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int tnl_hlen;
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int err;
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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->encapsulation && 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, true);
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else {
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const struct ipv6hdr *ipv6h;
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struct udphdr *uh;
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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);
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/* Do software UFO. Complete and fill in the UDP checksum as HW cannot
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* do checksum of UDP packets sent as multiple IP fragments.
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*/
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uh = udp_hdr(skb);
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ipv6h = ipv6_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_v6_check(skb->len, &ipv6h->saddr,
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&ipv6h->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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/* Check if there is enough headroom to insert fragment header. */
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tnl_hlen = skb_tnl_header_len(skb);
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if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) {
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if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
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goto out;
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}
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/* Find the unfragmentable header and shift it left by frag_hdr_sz
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* bytes to insert fragment header.
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*/
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err = ip6_find_1stfragopt(skb, &prevhdr);
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if (err < 0)
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return ERR_PTR(err);
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unfrag_ip6hlen = err;
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nexthdr = *prevhdr;
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*prevhdr = NEXTHDR_FRAGMENT;
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unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) +
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unfrag_ip6hlen + tnl_hlen;
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packet_start = (u8 *) skb->head + SKB_GSO_CB(skb)->mac_offset;
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memmove(packet_start-frag_hdr_sz, packet_start, unfrag_len);
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SKB_GSO_CB(skb)->mac_offset -= frag_hdr_sz;
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skb->mac_header -= frag_hdr_sz;
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skb->network_header -= frag_hdr_sz;
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fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
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fptr->nexthdr = nexthdr;
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fptr->reserved = 0;
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fptr->identification = ipv6_proxy_select_ident(dev_net(skb->dev), skb);
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/* Fragment the skb. ipv6 header and the remaining fields of the
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* fragment header are updated in ipv6_gso_segment()
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*/
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segs = skb_segment(skb, features);
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}
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out:
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return segs;
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}
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static struct sk_buff *udp6_gro_receive(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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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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ip6_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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ip6_gro_compute_pseudo);
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skip:
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NAPI_GRO_CB(skb)->is_ipv6 = 1;
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return udp_gro_receive(head, skb, uh, udp6_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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static int udp6_gro_complete(struct sk_buff *skb, int nhoff)
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{
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const struct ipv6hdr *ipv6h = ipv6_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_v6_check(skb->len - nhoff, &ipv6h->saddr,
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&ipv6h->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, udp6_lib_lookup_skb);
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}
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static const struct net_offload udpv6_offload = {
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.callbacks = {
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.gso_segment = udp6_ufo_fragment,
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.gro_receive = udp6_gro_receive,
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.gro_complete = udp6_gro_complete,
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},
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};
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int udpv6_offload_init(void)
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{
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return inet6_add_offload(&udpv6_offload, IPPROTO_UDP);
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}
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int udpv6_offload_exit(void)
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{
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return inet6_del_offload(&udpv6_offload, IPPROTO_UDP);
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}
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