mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 09:36:41 +07:00
2ba5af42a7
When there are multiple vlan headers present in a received frame, the first one is put into vlan_tci and protocol is set to ETH_P_8021Q. Anything in the skb beyond the VLAN TPID may be still non-linear, including the inner TCI and ethertype. While ovs_flow_extract takes care of IP and IPv6 headers, it does nothing with ETH_P_8021Q. Later, if OVS_ACTION_ATTR_POP_VLAN is executed, __pop_vlan_tci pulls the next vlan header into vlan_tci. This leads to two things: 1. Part of the resulting ethernet header is in the non-linear part of the skb. When eth_type_trans is called later as the result of OVS_ACTION_ATTR_OUTPUT, kernel BUGs in __skb_pull. Also, __pop_vlan_tci is in fact accessing random data when it reads past the TPID. 2. network_header points into the ethernet header instead of behind it. mac_len is set to a wrong value (10), too. Reported-by: Yulong Pei <ypei@redhat.com> Signed-off-by: Jiri Benc <jbenc@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
618 lines
15 KiB
C
618 lines
15 KiB
C
/*
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* Copyright (c) 2007-2013 Nicira, Inc.
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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 version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/skbuff.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/openvswitch.h>
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#include <linux/sctp.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/in6.h>
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#include <linux/if_arp.h>
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#include <linux/if_vlan.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/checksum.h>
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#include <net/dsfield.h>
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#include <net/sctp/checksum.h>
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#include "datapath.h"
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#include "vport.h"
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static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
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const struct nlattr *attr, int len);
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static int make_writable(struct sk_buff *skb, int write_len)
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{
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if (!pskb_may_pull(skb, write_len))
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return -ENOMEM;
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if (!skb_cloned(skb) || skb_clone_writable(skb, write_len))
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return 0;
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return pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
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}
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/* remove VLAN header from packet and update csum accordingly. */
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static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
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{
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struct vlan_hdr *vhdr;
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int err;
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err = make_writable(skb, VLAN_ETH_HLEN);
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if (unlikely(err))
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return err;
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if (skb->ip_summed == CHECKSUM_COMPLETE)
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skb->csum = csum_sub(skb->csum, csum_partial(skb->data
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+ (2 * ETH_ALEN), VLAN_HLEN, 0));
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vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);
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*current_tci = vhdr->h_vlan_TCI;
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memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN);
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__skb_pull(skb, VLAN_HLEN);
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vlan_set_encap_proto(skb, vhdr);
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skb->mac_header += VLAN_HLEN;
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if (skb_network_offset(skb) < ETH_HLEN)
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skb_set_network_header(skb, ETH_HLEN);
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skb_reset_mac_len(skb);
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return 0;
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}
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static int pop_vlan(struct sk_buff *skb)
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{
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__be16 tci;
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int err;
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if (likely(vlan_tx_tag_present(skb))) {
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skb->vlan_tci = 0;
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} else {
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if (unlikely(skb->protocol != htons(ETH_P_8021Q) ||
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skb->len < VLAN_ETH_HLEN))
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return 0;
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err = __pop_vlan_tci(skb, &tci);
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if (err)
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return err;
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}
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/* move next vlan tag to hw accel tag */
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if (likely(skb->protocol != htons(ETH_P_8021Q) ||
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skb->len < VLAN_ETH_HLEN))
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return 0;
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err = __pop_vlan_tci(skb, &tci);
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if (unlikely(err))
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return err;
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__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(tci));
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return 0;
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}
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static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan)
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{
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if (unlikely(vlan_tx_tag_present(skb))) {
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u16 current_tag;
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/* push down current VLAN tag */
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current_tag = vlan_tx_tag_get(skb);
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if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag))
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return -ENOMEM;
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if (skb->ip_summed == CHECKSUM_COMPLETE)
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skb->csum = csum_add(skb->csum, csum_partial(skb->data
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+ (2 * ETH_ALEN), VLAN_HLEN, 0));
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}
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__vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
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return 0;
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}
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static int set_eth_addr(struct sk_buff *skb,
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const struct ovs_key_ethernet *eth_key)
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{
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int err;
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err = make_writable(skb, ETH_HLEN);
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if (unlikely(err))
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return err;
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skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
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ether_addr_copy(eth_hdr(skb)->h_source, eth_key->eth_src);
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ether_addr_copy(eth_hdr(skb)->h_dest, eth_key->eth_dst);
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ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
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return 0;
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}
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static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
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__be32 *addr, __be32 new_addr)
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{
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int transport_len = skb->len - skb_transport_offset(skb);
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if (nh->protocol == IPPROTO_TCP) {
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if (likely(transport_len >= sizeof(struct tcphdr)))
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inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
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*addr, new_addr, 1);
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} else if (nh->protocol == IPPROTO_UDP) {
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if (likely(transport_len >= sizeof(struct udphdr))) {
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struct udphdr *uh = udp_hdr(skb);
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if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
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inet_proto_csum_replace4(&uh->check, skb,
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*addr, new_addr, 1);
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if (!uh->check)
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uh->check = CSUM_MANGLED_0;
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}
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}
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}
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csum_replace4(&nh->check, *addr, new_addr);
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skb_clear_hash(skb);
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*addr = new_addr;
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}
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static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
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__be32 addr[4], const __be32 new_addr[4])
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{
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int transport_len = skb->len - skb_transport_offset(skb);
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if (l4_proto == IPPROTO_TCP) {
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if (likely(transport_len >= sizeof(struct tcphdr)))
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inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
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addr, new_addr, 1);
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} else if (l4_proto == IPPROTO_UDP) {
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if (likely(transport_len >= sizeof(struct udphdr))) {
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struct udphdr *uh = udp_hdr(skb);
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if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
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inet_proto_csum_replace16(&uh->check, skb,
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addr, new_addr, 1);
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if (!uh->check)
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uh->check = CSUM_MANGLED_0;
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}
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}
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}
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}
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static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
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__be32 addr[4], const __be32 new_addr[4],
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bool recalculate_csum)
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{
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if (recalculate_csum)
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update_ipv6_checksum(skb, l4_proto, addr, new_addr);
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skb_clear_hash(skb);
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memcpy(addr, new_addr, sizeof(__be32[4]));
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}
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static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc)
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{
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nh->priority = tc >> 4;
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nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4);
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}
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static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl)
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{
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nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16;
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nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8;
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nh->flow_lbl[2] = fl & 0x000000FF;
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}
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static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl)
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{
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csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
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nh->ttl = new_ttl;
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}
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static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
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{
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struct iphdr *nh;
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int err;
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err = make_writable(skb, skb_network_offset(skb) +
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sizeof(struct iphdr));
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if (unlikely(err))
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return err;
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nh = ip_hdr(skb);
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if (ipv4_key->ipv4_src != nh->saddr)
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set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src);
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if (ipv4_key->ipv4_dst != nh->daddr)
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set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst);
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if (ipv4_key->ipv4_tos != nh->tos)
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ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos);
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if (ipv4_key->ipv4_ttl != nh->ttl)
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set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl);
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return 0;
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}
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static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key)
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{
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struct ipv6hdr *nh;
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int err;
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__be32 *saddr;
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__be32 *daddr;
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err = make_writable(skb, skb_network_offset(skb) +
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sizeof(struct ipv6hdr));
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if (unlikely(err))
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return err;
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nh = ipv6_hdr(skb);
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saddr = (__be32 *)&nh->saddr;
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daddr = (__be32 *)&nh->daddr;
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if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src)))
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set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr,
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ipv6_key->ipv6_src, true);
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if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) {
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unsigned int offset = 0;
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int flags = IP6_FH_F_SKIP_RH;
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bool recalc_csum = true;
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if (ipv6_ext_hdr(nh->nexthdr))
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recalc_csum = ipv6_find_hdr(skb, &offset,
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NEXTHDR_ROUTING, NULL,
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&flags) != NEXTHDR_ROUTING;
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set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr,
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ipv6_key->ipv6_dst, recalc_csum);
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}
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set_ipv6_tc(nh, ipv6_key->ipv6_tclass);
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set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label));
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nh->hop_limit = ipv6_key->ipv6_hlimit;
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return 0;
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}
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/* Must follow make_writable() since that can move the skb data. */
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static void set_tp_port(struct sk_buff *skb, __be16 *port,
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__be16 new_port, __sum16 *check)
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{
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inet_proto_csum_replace2(check, skb, *port, new_port, 0);
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*port = new_port;
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skb_clear_hash(skb);
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}
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static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port)
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{
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struct udphdr *uh = udp_hdr(skb);
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if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
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set_tp_port(skb, port, new_port, &uh->check);
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if (!uh->check)
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uh->check = CSUM_MANGLED_0;
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} else {
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*port = new_port;
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skb_clear_hash(skb);
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}
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}
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static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key)
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{
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struct udphdr *uh;
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int err;
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err = make_writable(skb, skb_transport_offset(skb) +
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sizeof(struct udphdr));
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if (unlikely(err))
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return err;
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uh = udp_hdr(skb);
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if (udp_port_key->udp_src != uh->source)
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set_udp_port(skb, &uh->source, udp_port_key->udp_src);
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if (udp_port_key->udp_dst != uh->dest)
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set_udp_port(skb, &uh->dest, udp_port_key->udp_dst);
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return 0;
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}
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static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key)
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{
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struct tcphdr *th;
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int err;
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err = make_writable(skb, skb_transport_offset(skb) +
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sizeof(struct tcphdr));
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if (unlikely(err))
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return err;
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th = tcp_hdr(skb);
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if (tcp_port_key->tcp_src != th->source)
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set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check);
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if (tcp_port_key->tcp_dst != th->dest)
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set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check);
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return 0;
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}
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static int set_sctp(struct sk_buff *skb,
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const struct ovs_key_sctp *sctp_port_key)
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{
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struct sctphdr *sh;
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int err;
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unsigned int sctphoff = skb_transport_offset(skb);
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err = make_writable(skb, sctphoff + sizeof(struct sctphdr));
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if (unlikely(err))
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return err;
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sh = sctp_hdr(skb);
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if (sctp_port_key->sctp_src != sh->source ||
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sctp_port_key->sctp_dst != sh->dest) {
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__le32 old_correct_csum, new_csum, old_csum;
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old_csum = sh->checksum;
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old_correct_csum = sctp_compute_cksum(skb, sctphoff);
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sh->source = sctp_port_key->sctp_src;
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sh->dest = sctp_port_key->sctp_dst;
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new_csum = sctp_compute_cksum(skb, sctphoff);
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/* Carry any checksum errors through. */
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sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
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skb_clear_hash(skb);
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}
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return 0;
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}
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static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
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{
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struct vport *vport;
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if (unlikely(!skb))
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return -ENOMEM;
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vport = ovs_vport_rcu(dp, out_port);
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if (unlikely(!vport)) {
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kfree_skb(skb);
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return -ENODEV;
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}
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ovs_vport_send(vport, skb);
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return 0;
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}
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static int output_userspace(struct datapath *dp, struct sk_buff *skb,
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const struct nlattr *attr)
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{
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struct dp_upcall_info upcall;
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const struct nlattr *a;
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int rem;
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BUG_ON(!OVS_CB(skb)->pkt_key);
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upcall.cmd = OVS_PACKET_CMD_ACTION;
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upcall.key = OVS_CB(skb)->pkt_key;
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upcall.userdata = NULL;
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upcall.portid = 0;
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for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
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a = nla_next(a, &rem)) {
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switch (nla_type(a)) {
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case OVS_USERSPACE_ATTR_USERDATA:
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upcall.userdata = a;
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break;
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case OVS_USERSPACE_ATTR_PID:
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upcall.portid = nla_get_u32(a);
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break;
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}
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}
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return ovs_dp_upcall(dp, skb, &upcall);
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}
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static bool last_action(const struct nlattr *a, int rem)
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{
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return a->nla_len == rem;
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}
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static int sample(struct datapath *dp, struct sk_buff *skb,
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const struct nlattr *attr)
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{
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const struct nlattr *acts_list = NULL;
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const struct nlattr *a;
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struct sk_buff *sample_skb;
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int rem;
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for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
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a = nla_next(a, &rem)) {
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switch (nla_type(a)) {
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case OVS_SAMPLE_ATTR_PROBABILITY:
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if (prandom_u32() >= nla_get_u32(a))
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return 0;
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break;
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case OVS_SAMPLE_ATTR_ACTIONS:
|
|
acts_list = a;
|
|
break;
|
|
}
|
|
}
|
|
|
|
rem = nla_len(acts_list);
|
|
a = nla_data(acts_list);
|
|
|
|
/* Actions list is either empty or only contains a single user-space
|
|
* action, the latter being a special case as it is the only known
|
|
* usage of the sample action.
|
|
* In these special cases don't clone the skb as there are no
|
|
* side-effects in the nested actions.
|
|
* Otherwise, clone in case the nested actions have side effects.
|
|
*/
|
|
if (likely(rem == 0 || (nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
|
|
last_action(a, rem)))) {
|
|
sample_skb = skb;
|
|
skb_get(skb);
|
|
} else {
|
|
sample_skb = skb_clone(skb, GFP_ATOMIC);
|
|
if (!sample_skb) /* Skip sample action when out of memory. */
|
|
return 0;
|
|
}
|
|
|
|
/* Note that do_execute_actions() never consumes skb.
|
|
* In the case where skb has been cloned above it is the clone that
|
|
* is consumed. Otherwise the skb_get(skb) call prevents
|
|
* consumption by do_execute_actions(). Thus, it is safe to simply
|
|
* return the error code and let the caller (also
|
|
* do_execute_actions()) free skb on error.
|
|
*/
|
|
return do_execute_actions(dp, sample_skb, a, rem);
|
|
}
|
|
|
|
static int execute_set_action(struct sk_buff *skb,
|
|
const struct nlattr *nested_attr)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (nla_type(nested_attr)) {
|
|
case OVS_KEY_ATTR_PRIORITY:
|
|
skb->priority = nla_get_u32(nested_attr);
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_SKB_MARK:
|
|
skb->mark = nla_get_u32(nested_attr);
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_IPV4_TUNNEL:
|
|
OVS_CB(skb)->tun_key = nla_data(nested_attr);
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_ETHERNET:
|
|
err = set_eth_addr(skb, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_IPV4:
|
|
err = set_ipv4(skb, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_IPV6:
|
|
err = set_ipv6(skb, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_TCP:
|
|
err = set_tcp(skb, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_UDP:
|
|
err = set_udp(skb, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_SCTP:
|
|
err = set_sctp(skb, nla_data(nested_attr));
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Execute a list of actions against 'skb'. */
|
|
static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
|
|
const struct nlattr *attr, int len)
|
|
{
|
|
/* Every output action needs a separate clone of 'skb', but the common
|
|
* case is just a single output action, so that doing a clone and
|
|
* then freeing the original skbuff is wasteful. So the following code
|
|
* is slightly obscure just to avoid that. */
|
|
int prev_port = -1;
|
|
const struct nlattr *a;
|
|
int rem;
|
|
|
|
for (a = attr, rem = len; rem > 0;
|
|
a = nla_next(a, &rem)) {
|
|
int err = 0;
|
|
|
|
if (prev_port != -1) {
|
|
do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port);
|
|
prev_port = -1;
|
|
}
|
|
|
|
switch (nla_type(a)) {
|
|
case OVS_ACTION_ATTR_OUTPUT:
|
|
prev_port = nla_get_u32(a);
|
|
break;
|
|
|
|
case OVS_ACTION_ATTR_USERSPACE:
|
|
output_userspace(dp, skb, a);
|
|
break;
|
|
|
|
case OVS_ACTION_ATTR_PUSH_VLAN:
|
|
err = push_vlan(skb, nla_data(a));
|
|
if (unlikely(err)) /* skb already freed. */
|
|
return err;
|
|
break;
|
|
|
|
case OVS_ACTION_ATTR_POP_VLAN:
|
|
err = pop_vlan(skb);
|
|
break;
|
|
|
|
case OVS_ACTION_ATTR_SET:
|
|
err = execute_set_action(skb, nla_data(a));
|
|
break;
|
|
|
|
case OVS_ACTION_ATTR_SAMPLE:
|
|
err = sample(dp, skb, a);
|
|
if (unlikely(err)) /* skb already freed. */
|
|
return err;
|
|
break;
|
|
}
|
|
|
|
if (unlikely(err)) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (prev_port != -1)
|
|
do_output(dp, skb, prev_port);
|
|
else
|
|
consume_skb(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Execute a list of actions against 'skb'. */
|
|
int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb)
|
|
{
|
|
struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
|
|
|
|
OVS_CB(skb)->tun_key = NULL;
|
|
return do_execute_actions(dp, skb, acts->actions, acts->actions_len);
|
|
}
|