+++ /dev/null
-/*
- * Copyright (c) 2007-2012 Nicira, Inc.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/in.h>
-#include <linux/in_route.h>
-#include <linux/inetdevice.h>
-#include <linux/jhash.h>
-#include <linux/list.h>
-#include <linux/kernel.h>
-#include <linux/version.h>
-#include <linux/workqueue.h>
-#include <linux/rculist.h>
-#include <net/route.h>
-#include <net/xfrm.h>
-
-#include "checksum.h"
-#include "compat.h"
-#include "datapath.h"
-#include "tunnel.h"
-#include "vlan.h"
-#include "vport.h"
-
-/**
- * ovs_tnl_rcv - ingress point for generic tunnel code
- *
- * @vport: port this packet was received on
- * @skb: received packet
- * @tos: ToS from encapsulating IP packet, used to copy ECN bits
- *
- * Must be called with rcu_read_lock.
- *
- * Packets received by this function are in the following state:
- * - skb->data points to the inner Ethernet header.
- * - The inner Ethernet header is in the linear data area.
- * - skb->csum does not include the inner Ethernet header.
- * - The layer pointers are undefined.
- */
-void ovs_tnl_rcv(struct vport *vport, struct sk_buff *skb,
- struct ovs_key_ipv4_tunnel *tun_key)
-{
- struct ethhdr *eh;
-
- skb_reset_mac_header(skb);
- eh = eth_hdr(skb);
-
- if (likely(ntohs(eh->h_proto) >= ETH_P_802_3_MIN))
- skb->protocol = eh->h_proto;
- else
- skb->protocol = htons(ETH_P_802_2);
-
- skb_dst_drop(skb);
- nf_reset(skb);
- skb_clear_rxhash(skb);
- secpath_reset(skb);
- vlan_set_tci(skb, 0);
-
- if (unlikely(compute_ip_summed(skb, false))) {
- kfree_skb(skb);
- return;
- }
-
- ovs_vport_receive(vport, skb, tun_key);
-}
-
-static bool need_linearize(const struct sk_buff *skb)
-{
- int i;
-
- if (unlikely(skb_shinfo(skb)->frag_list))
- return true;
-
- /*
- * Generally speaking we should linearize if there are paged frags.
- * However, if all of the refcounts are 1 we know nobody else can
- * change them from underneath us and we can skip the linearization.
- */
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
- if (unlikely(page_count(skb_frag_page(&skb_shinfo(skb)->frags[i])) > 1))
- return true;
-
- return false;
-}
-
-static struct sk_buff *handle_offloads(struct sk_buff *skb)
-{
- int err;
-
- forward_ip_summed(skb, true);
-
- if (skb_is_gso(skb)) {
- struct sk_buff *nskb;
- char cb[sizeof(skb->cb)];
-
- memcpy(cb, skb->cb, sizeof(cb));
-
- nskb = __skb_gso_segment(skb, 0, false);
- if (IS_ERR(nskb)) {
- err = PTR_ERR(nskb);
- goto error;
- }
-
- consume_skb(skb);
- skb = nskb;
- while (nskb) {
- memcpy(nskb->cb, cb, sizeof(cb));
- nskb = nskb->next;
- }
- } else if (get_ip_summed(skb) == OVS_CSUM_PARTIAL) {
- /* Pages aren't locked and could change at any time.
- * If this happens after we compute the checksum, the
- * checksum will be wrong. We linearize now to avoid
- * this problem.
- */
- if (unlikely(need_linearize(skb))) {
- err = __skb_linearize(skb);
- if (unlikely(err))
- goto error;
- }
-
- err = skb_checksum_help(skb);
- if (unlikely(err))
- goto error;
- }
-
- set_ip_summed(skb, OVS_CSUM_NONE);
-
- return skb;
-
-error:
- return ERR_PTR(err);
-}
-
-/* Compute source UDP port for outgoing packet.
- * Currently we use the flow hash.
- */
-u16 ovs_tnl_get_src_port(struct sk_buff *skb)
-{
- int low;
- int high;
- unsigned int range;
- struct sw_flow_key *pkt_key = OVS_CB(skb)->pkt_key;
- u32 hash = jhash2((const u32 *)pkt_key,
- sizeof(*pkt_key) / sizeof(u32), 0);
-
- inet_get_local_port_range(&low, &high);
- range = (high - low) + 1;
- return (((u64) hash * range) >> 32) + low;
-}
-
-int ovs_tnl_send(struct vport *vport, struct sk_buff *skb,
- u8 ipproto, int tunnel_hlen,
- void (*build_header)(const struct vport *,
- struct sk_buff *,
- int tunnel_hlen))
-{
- int min_headroom;
- struct rtable *rt;
- __be32 saddr;
- int sent_len = 0;
- int err;
- struct sk_buff *nskb;
-
- /* Route lookup */
- saddr = OVS_CB(skb)->tun_key->ipv4_src;
- rt = find_route(ovs_dp_get_net(vport->dp),
- &saddr,
- OVS_CB(skb)->tun_key->ipv4_dst,
- ipproto,
- OVS_CB(skb)->tun_key->ipv4_tos,
- skb_get_mark(skb));
- if (IS_ERR(rt)) {
- err = PTR_ERR(rt);
- goto error;
- }
-
- tunnel_hlen += sizeof(struct iphdr);
-
- min_headroom = LL_RESERVED_SPACE(rt_dst(rt).dev) + rt_dst(rt).header_len
- + tunnel_hlen
- + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
-
- if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
- int head_delta = SKB_DATA_ALIGN(min_headroom -
- skb_headroom(skb) +
- 16);
-
- err = pskb_expand_head(skb, max_t(int, head_delta, 0),
- 0, GFP_ATOMIC);
- if (unlikely(err))
- goto err_free_rt;
- }
-
- /* Offloading */
- nskb = handle_offloads(skb);
- if (IS_ERR(nskb)) {
- err = PTR_ERR(nskb);
- goto err_free_rt;
- }
- skb = nskb;
-
- /* Reset SKB */
- nf_reset(skb);
- secpath_reset(skb);
- skb_dst_drop(skb);
- skb_clear_rxhash(skb);
-
- while (skb) {
- struct sk_buff *next_skb = skb->next;
- struct iphdr *iph;
- int frag_len;
-
- skb->next = NULL;
-
- if (unlikely(vlan_deaccel_tag(skb)))
- goto next;
-
- frag_len = skb->len;
- skb_push(skb, tunnel_hlen);
- skb_reset_network_header(skb);
- skb_set_transport_header(skb, sizeof(struct iphdr));
-
- if (next_skb)
- skb_dst_set(skb, dst_clone(&rt_dst(rt)));
- else
- skb_dst_set(skb, &rt_dst(rt));
-
- /* Push Tunnel header. */
- build_header(vport, skb, tunnel_hlen);
-
- /* Push IP header. */
- iph = ip_hdr(skb);
- iph->version = 4;
- iph->ihl = sizeof(struct iphdr) >> 2;
- iph->protocol = ipproto;
- iph->daddr = OVS_CB(skb)->tun_key->ipv4_dst;
- iph->saddr = saddr;
- iph->tos = OVS_CB(skb)->tun_key->ipv4_tos;
- iph->ttl = OVS_CB(skb)->tun_key->ipv4_ttl;
- iph->frag_off = OVS_CB(skb)->tun_key->tun_flags &
- TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
- /*
- * Allow our local IP stack to fragment the outer packet even
- * if the DF bit is set as a last resort. We also need to
- * force selection of an IP ID here with __ip_select_ident(),
- * as ip_select_ident() assumes a proper ID is not needed when
- * when the DF bit is set.
- */
- skb->local_df = 1;
- __ip_select_ident(iph, skb_dst(skb), 0);
-
- memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
-
- err = ip_local_out(skb);
- if (unlikely(net_xmit_eval(err)))
- goto next;
-
- sent_len += frag_len;
-
-next:
- skb = next_skb;
- }
-
- return sent_len;
-
-err_free_rt:
- ip_rt_put(rt);
-error:
- return err;
-}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff