Release 4.11 net/ipv6/udp_offload.c
/*
* 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_ufo_fragment(struct sk_buff *skb,
netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EINVAL);
unsigned int mss;
unsigned int unfrag_ip6hlen, unfrag_len;
struct frag_hdr *fptr;
u8 *packet_start, *prevhdr;
u8 nexthdr;
u8 frag_hdr_sz = sizeof(struct frag_hdr);
__wsum csum;
int tnl_hlen;
mss = skb_shinfo(skb)->gso_size;
if (unlikely(skb->len <= mss))
goto out;
if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
/* Packet is from an untrusted source, reset gso_segs. */
skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
/* Set the IPv6 fragment id if not set yet */
if (!skb_shinfo(skb)->ip6_frag_id)
ipv6_proxy_select_ident(dev_net(skb->dev), skb);
segs = NULL;
goto out;
}
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);
else {
const struct ipv6hdr *ipv6h;
struct udphdr *uh;
if (!pskb_may_pull(skb, sizeof(struct udphdr)))
goto out;
/* Do software UFO. Complete and fill in the UDP checksum as HW cannot
* do checksum of UDP packets sent as multiple IP fragments.
*/
uh = udp_hdr(skb);
ipv6h = ipv6_hdr(skb);
uh->check = 0;
csum = skb_checksum(skb, 0, skb->len, 0);
uh->check = udp_v6_check(skb->len, &ipv6h->saddr,
&ipv6h->daddr, csum);
if (uh->check == 0)
uh->check = CSUM_MANGLED_0;
skb->ip_summed = CHECKSUM_NONE;
/* If there is no outer header we can fake a checksum offload
* due to the fact that we have already done the checksum in
* software prior to segmenting the frame.
*/
if (!skb->encap_hdr_csum)
features |= NETIF_F_HW_CSUM;
/* Check if there is enough headroom to insert fragment header. */
tnl_hlen = skb_tnl_header_len(skb);
if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) {
if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
goto out;
}
/* Find the unfragmentable header and shift it left by frag_hdr_sz
* bytes to insert fragment header.
*/
unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
nexthdr = *prevhdr;
*prevhdr = NEXTHDR_FRAGMENT;
unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) +
unfrag_ip6hlen + tnl_hlen;
packet_start = (u8 *) skb->head + SKB_GSO_CB(skb)->mac_offset;
memmove(packet_start-frag_hdr_sz, packet_start, unfrag_len);
SKB_GSO_CB(skb)->mac_offset -= frag_hdr_sz;
skb->mac_header -= frag_hdr_sz;
skb->network_header -= frag_hdr_sz;
fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
fptr->nexthdr = nexthdr;
fptr->reserved = 0;
if (!skb_shinfo(skb)->ip6_frag_id)
ipv6_proxy_select_ident(dev_net(skb->dev), skb);
fptr->identification = skb_shinfo(skb)->ip6_frag_id;
/* Fragment the skb. ipv6 header and the remaining fields of the
* fragment header are updated in ipv6_gso_segment()
*/
segs = skb_segment(skb, features);
}
out:
return segs;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vlad Yasevich | 303 | 60.36% | 2 | 15.38% |
| Tom Herbert | 81 | 16.14% | 3 | 23.08% |
| Pravin B Shelar | 48 | 9.56% | 1 | 7.69% |
| Américo Wang | 30 | 5.98% | 2 | 15.38% |
| Hannes Frederic Sowa | 22 | 4.38% | 3 | 23.08% |
| Alexander Duyck | 12 | 2.39% | 1 | 7.69% |
| Sabrina Dubroca | 6 | 1.20% | 1 | 7.69% |
| Total | 502 | 100.00% | 13 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Tom Herbert | 129 | 100.00% | 4 | 100.00% |
| Total | 129 | 100.00% | 4 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Tom Herbert | 107 | 99.07% | 3 | 75.00% |
| Eric Dumazet | 1 | 0.93% | 1 | 25.00% |
| Total | 108 | 100.00% | 4 | 100.00% |
static const struct net_offload udpv6_offload = {
.callbacks = {
.gso_segment = udp6_ufo_fragment,
.gro_receive = udp6_gro_receive,
.gro_complete = udp6_gro_complete,
},
};
int udpv6_offload_init(void)
{
return inet6_add_offload(&udpv6_offload, IPPROTO_UDP);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vlad Yasevich | 15 | 93.75% | 1 | 50.00% |
| Tom Herbert | 1 | 6.25% | 1 | 50.00% |
| Total | 16 | 100.00% | 2 | 100.00% |
int udpv6_offload_exit(void)
{
return inet6_del_offload(&udpv6_offload, IPPROTO_UDP);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Tom Herbert | 16 | 100.00% | 1 | 100.00% |
| Total | 16 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vlad Yasevich | 355 | 43.24% | 4 | 19.05% |
| Tom Herbert | 347 | 42.27% | 8 | 38.10% |
| Pravin B Shelar | 48 | 5.85% | 1 | 4.76% |
| Américo Wang | 30 | 3.65% | 2 | 9.52% |
| Hannes Frederic Sowa | 22 | 2.68% | 3 | 14.29% |
| Alexander Duyck | 12 | 1.46% | 1 | 4.76% |
| Sabrina Dubroca | 6 | 0.73% | 1 | 4.76% |
| Eric Dumazet | 1 | 0.12% | 1 | 4.76% |
| Total | 821 | 100.00% | 21 | 100.00% |
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