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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2007-2017 Nicira, Inc.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/skbuff.h>
- #include <linux/in.h>
- #include <linux/ip.h>
- #include <linux/openvswitch.h>
- #include <linux/sctp.h>
- #include <linux/tcp.h>
- #include <linux/udp.h>
- #include <linux/in6.h>
- #include <linux/if_arp.h>
- #include <linux/if_vlan.h>
- #include <net/dst.h>
- #include <net/ip.h>
- #include <net/ipv6.h>
- #include <net/ip6_fib.h>
- #include <net/checksum.h>
- #include <net/dsfield.h>
- #include <net/mpls.h>
- #include <net/sctp/checksum.h>
- #include "datapath.h"
- #include "flow.h"
- #include "conntrack.h"
- #include "vport.h"
- #include "flow_netlink.h"
- struct deferred_action {
- struct sk_buff *skb;
- const struct nlattr *actions;
- int actions_len;
- /* Store pkt_key clone when creating deferred action. */
- struct sw_flow_key pkt_key;
- };
- #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
- struct ovs_frag_data {
- unsigned long dst;
- struct vport *vport;
- struct ovs_skb_cb cb;
- __be16 inner_protocol;
- u16 network_offset; /* valid only for MPLS */
- u16 vlan_tci;
- __be16 vlan_proto;
- unsigned int l2_len;
- u8 mac_proto;
- u8 l2_data[MAX_L2_LEN];
- };
- static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
- #define DEFERRED_ACTION_FIFO_SIZE 10
- #define OVS_RECURSION_LIMIT 5
- #define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
- struct action_fifo {
- int head;
- int tail;
- /* Deferred action fifo queue storage. */
- struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
- };
- struct action_flow_keys {
- struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
- };
- static struct action_fifo __percpu *action_fifos;
- static struct action_flow_keys __percpu *flow_keys;
- static DEFINE_PER_CPU(int, exec_actions_level);
- /* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys'
- * space. Return NULL if out of key spaces.
- */
- static struct sw_flow_key *clone_key(const struct sw_flow_key *key_)
- {
- struct action_flow_keys *keys = this_cpu_ptr(flow_keys);
- int level = this_cpu_read(exec_actions_level);
- struct sw_flow_key *key = NULL;
- if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
- key = &keys->key[level - 1];
- *key = *key_;
- }
- return key;
- }
- static void action_fifo_init(struct action_fifo *fifo)
- {
- fifo->head = 0;
- fifo->tail = 0;
- }
- static bool action_fifo_is_empty(const struct action_fifo *fifo)
- {
- return (fifo->head == fifo->tail);
- }
- static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
- {
- if (action_fifo_is_empty(fifo))
- return NULL;
- return &fifo->fifo[fifo->tail++];
- }
- static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
- {
- if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
- return NULL;
- return &fifo->fifo[fifo->head++];
- }
- /* Return true if fifo is not full */
- static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
- const struct sw_flow_key *key,
- const struct nlattr *actions,
- const int actions_len)
- {
- struct action_fifo *fifo;
- struct deferred_action *da;
- fifo = this_cpu_ptr(action_fifos);
- da = action_fifo_put(fifo);
- if (da) {
- da->skb = skb;
- da->actions = actions;
- da->actions_len = actions_len;
- da->pkt_key = *key;
- }
- return da;
- }
- static void invalidate_flow_key(struct sw_flow_key *key)
- {
- key->mac_proto |= SW_FLOW_KEY_INVALID;
- }
- static bool is_flow_key_valid(const struct sw_flow_key *key)
- {
- return !(key->mac_proto & SW_FLOW_KEY_INVALID);
- }
- static int clone_execute(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key,
- u32 recirc_id,
- const struct nlattr *actions, int len,
- bool last, bool clone_flow_key);
- static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key,
- const struct nlattr *attr, int len);
- static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
- __be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len)
- {
- int err;
- err = skb_mpls_push(skb, mpls_lse, mpls_ethertype, mac_len, !!mac_len);
- if (err)
- return err;
- if (!mac_len)
- key->mac_proto = MAC_PROTO_NONE;
- invalidate_flow_key(key);
- return 0;
- }
- static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
- const __be16 ethertype)
- {
- int err;
- err = skb_mpls_pop(skb, ethertype, skb->mac_len,
- ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET);
- if (err)
- return err;
- if (ethertype == htons(ETH_P_TEB))
- key->mac_proto = MAC_PROTO_ETHERNET;
- invalidate_flow_key(key);
- return 0;
- }
- static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
- const __be32 *mpls_lse, const __be32 *mask)
- {
- struct mpls_shim_hdr *stack;
- __be32 lse;
- int err;
- if (!pskb_may_pull(skb, skb_network_offset(skb) + MPLS_HLEN))
- return -ENOMEM;
- stack = mpls_hdr(skb);
- lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
- err = skb_mpls_update_lse(skb, lse);
- if (err)
- return err;
- flow_key->mpls.lse[0] = lse;
- return 0;
- }
- static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
- {
- int err;
- err = skb_vlan_pop(skb);
- if (skb_vlan_tag_present(skb)) {
- invalidate_flow_key(key);
- } else {
- key->eth.vlan.tci = 0;
- key->eth.vlan.tpid = 0;
- }
- return err;
- }
- static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
- const struct ovs_action_push_vlan *vlan)
- {
- if (skb_vlan_tag_present(skb)) {
- invalidate_flow_key(key);
- } else {
- key->eth.vlan.tci = vlan->vlan_tci;
- key->eth.vlan.tpid = vlan->vlan_tpid;
- }
- return skb_vlan_push(skb, vlan->vlan_tpid,
- ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK);
- }
- /* 'src' is already properly masked. */
- static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
- {
- u16 *dst = (u16 *)dst_;
- const u16 *src = (const u16 *)src_;
- const u16 *mask = (const u16 *)mask_;
- OVS_SET_MASKED(dst[0], src[0], mask[0]);
- OVS_SET_MASKED(dst[1], src[1], mask[1]);
- OVS_SET_MASKED(dst[2], src[2], mask[2]);
- }
- static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
- const struct ovs_key_ethernet *key,
- const struct ovs_key_ethernet *mask)
- {
- int err;
- err = skb_ensure_writable(skb, ETH_HLEN);
- if (unlikely(err))
- return err;
- skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
- ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
- mask->eth_src);
- ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
- mask->eth_dst);
- skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
- ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
- ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
- return 0;
- }
- /* pop_eth does not support VLAN packets as this action is never called
- * for them.
- */
- static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
- {
- int err;
- err = skb_eth_pop(skb);
- if (err)
- return err;
- /* safe right before invalidate_flow_key */
- key->mac_proto = MAC_PROTO_NONE;
- invalidate_flow_key(key);
- return 0;
- }
- static int push_eth(struct sk_buff *skb, struct sw_flow_key *key,
- const struct ovs_action_push_eth *ethh)
- {
- int err;
- err = skb_eth_push(skb, ethh->addresses.eth_dst,
- ethh->addresses.eth_src);
- if (err)
- return err;
- /* safe right before invalidate_flow_key */
- key->mac_proto = MAC_PROTO_ETHERNET;
- invalidate_flow_key(key);
- return 0;
- }
- static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key,
- const struct nshhdr *nh)
- {
- int err;
- err = nsh_push(skb, nh);
- if (err)
- return err;
- /* safe right before invalidate_flow_key */
- key->mac_proto = MAC_PROTO_NONE;
- invalidate_flow_key(key);
- return 0;
- }
- static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key)
- {
- int err;
- err = nsh_pop(skb);
- if (err)
- return err;
- /* safe right before invalidate_flow_key */
- if (skb->protocol == htons(ETH_P_TEB))
- key->mac_proto = MAC_PROTO_ETHERNET;
- else
- key->mac_proto = MAC_PROTO_NONE;
- invalidate_flow_key(key);
- return 0;
- }
- static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh,
- __be32 addr, __be32 new_addr)
- {
- int transport_len = skb->len - skb_transport_offset(skb);
- if (nh->frag_off & htons(IP_OFFSET))
- return;
- if (nh->protocol == IPPROTO_TCP) {
- if (likely(transport_len >= sizeof(struct tcphdr)))
- inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
- addr, new_addr, true);
- } else if (nh->protocol == IPPROTO_UDP) {
- if (likely(transport_len >= sizeof(struct udphdr))) {
- struct udphdr *uh = udp_hdr(skb);
- if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
- inet_proto_csum_replace4(&uh->check, skb,
- addr, new_addr, true);
- if (!uh->check)
- uh->check = CSUM_MANGLED_0;
- }
- }
- }
- }
- static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
- __be32 *addr, __be32 new_addr)
- {
- update_ip_l4_checksum(skb, nh, *addr, new_addr);
- csum_replace4(&nh->check, *addr, new_addr);
- skb_clear_hash(skb);
- *addr = new_addr;
- }
- static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
- __be32 addr[4], const __be32 new_addr[4])
- {
- int transport_len = skb->len - skb_transport_offset(skb);
- if (l4_proto == NEXTHDR_TCP) {
- if (likely(transport_len >= sizeof(struct tcphdr)))
- inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
- addr, new_addr, true);
- } else if (l4_proto == NEXTHDR_UDP) {
- if (likely(transport_len >= sizeof(struct udphdr))) {
- struct udphdr *uh = udp_hdr(skb);
- if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
- inet_proto_csum_replace16(&uh->check, skb,
- addr, new_addr, true);
- if (!uh->check)
- uh->check = CSUM_MANGLED_0;
- }
- }
- } else if (l4_proto == NEXTHDR_ICMP) {
- if (likely(transport_len >= sizeof(struct icmp6hdr)))
- inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum,
- skb, addr, new_addr, true);
- }
- }
- static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4],
- const __be32 mask[4], __be32 masked[4])
- {
- masked[0] = OVS_MASKED(old[0], addr[0], mask[0]);
- masked[1] = OVS_MASKED(old[1], addr[1], mask[1]);
- masked[2] = OVS_MASKED(old[2], addr[2], mask[2]);
- masked[3] = OVS_MASKED(old[3], addr[3], mask[3]);
- }
- static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
- __be32 addr[4], const __be32 new_addr[4],
- bool recalculate_csum)
- {
- if (recalculate_csum)
- update_ipv6_checksum(skb, l4_proto, addr, new_addr);
- skb_clear_hash(skb);
- memcpy(addr, new_addr, sizeof(__be32[4]));
- }
- static void set_ipv6_dsfield(struct sk_buff *skb, struct ipv6hdr *nh, u8 ipv6_tclass, u8 mask)
- {
- u8 old_ipv6_tclass = ipv6_get_dsfield(nh);
- ipv6_tclass = OVS_MASKED(old_ipv6_tclass, ipv6_tclass, mask);
- if (skb->ip_summed == CHECKSUM_COMPLETE)
- csum_replace(&skb->csum, (__force __wsum)(old_ipv6_tclass << 12),
- (__force __wsum)(ipv6_tclass << 12));
- ipv6_change_dsfield(nh, ~mask, ipv6_tclass);
- }
- static void set_ipv6_fl(struct sk_buff *skb, struct ipv6hdr *nh, u32 fl, u32 mask)
- {
- u32 ofl;
- ofl = nh->flow_lbl[0] << 16 | nh->flow_lbl[1] << 8 | nh->flow_lbl[2];
- fl = OVS_MASKED(ofl, fl, mask);
- /* Bits 21-24 are always unmasked, so this retains their values. */
- nh->flow_lbl[0] = (u8)(fl >> 16);
- nh->flow_lbl[1] = (u8)(fl >> 8);
- nh->flow_lbl[2] = (u8)fl;
- if (skb->ip_summed == CHECKSUM_COMPLETE)
- csum_replace(&skb->csum, (__force __wsum)htonl(ofl), (__force __wsum)htonl(fl));
- }
- static void set_ipv6_ttl(struct sk_buff *skb, struct ipv6hdr *nh, u8 new_ttl, u8 mask)
- {
- new_ttl = OVS_MASKED(nh->hop_limit, new_ttl, mask);
- if (skb->ip_summed == CHECKSUM_COMPLETE)
- csum_replace(&skb->csum, (__force __wsum)(nh->hop_limit << 8),
- (__force __wsum)(new_ttl << 8));
- nh->hop_limit = new_ttl;
- }
- static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl,
- u8 mask)
- {
- new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask);
- csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
- nh->ttl = new_ttl;
- }
- static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key,
- const struct ovs_key_ipv4 *key,
- const struct ovs_key_ipv4 *mask)
- {
- struct iphdr *nh;
- __be32 new_addr;
- int err;
- err = skb_ensure_writable(skb, skb_network_offset(skb) +
- sizeof(struct iphdr));
- if (unlikely(err))
- return err;
- nh = ip_hdr(skb);
- /* Setting an IP addresses is typically only a side effect of
- * matching on them in the current userspace implementation, so it
- * makes sense to check if the value actually changed.
- */
- if (mask->ipv4_src) {
- new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src);
- if (unlikely(new_addr != nh->saddr)) {
- set_ip_addr(skb, nh, &nh->saddr, new_addr);
- flow_key->ipv4.addr.src = new_addr;
- }
- }
- if (mask->ipv4_dst) {
- new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst);
- if (unlikely(new_addr != nh->daddr)) {
- set_ip_addr(skb, nh, &nh->daddr, new_addr);
- flow_key->ipv4.addr.dst = new_addr;
- }
- }
- if (mask->ipv4_tos) {
- ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos);
- flow_key->ip.tos = nh->tos;
- }
- if (mask->ipv4_ttl) {
- set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl);
- flow_key->ip.ttl = nh->ttl;
- }
- return 0;
- }
- static bool is_ipv6_mask_nonzero(const __be32 addr[4])
- {
- return !!(addr[0] | addr[1] | addr[2] | addr[3]);
- }
- static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key,
- const struct ovs_key_ipv6 *key,
- const struct ovs_key_ipv6 *mask)
- {
- struct ipv6hdr *nh;
- int err;
- err = skb_ensure_writable(skb, skb_network_offset(skb) +
- sizeof(struct ipv6hdr));
- if (unlikely(err))
- return err;
- nh = ipv6_hdr(skb);
- /* Setting an IP addresses is typically only a side effect of
- * matching on them in the current userspace implementation, so it
- * makes sense to check if the value actually changed.
- */
- if (is_ipv6_mask_nonzero(mask->ipv6_src)) {
- __be32 *saddr = (__be32 *)&nh->saddr;
- __be32 masked[4];
- mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked);
- if (unlikely(memcmp(saddr, masked, sizeof(masked)))) {
- set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked,
- true);
- memcpy(&flow_key->ipv6.addr.src, masked,
- sizeof(flow_key->ipv6.addr.src));
- }
- }
- if (is_ipv6_mask_nonzero(mask->ipv6_dst)) {
- unsigned int offset = 0;
- int flags = IP6_FH_F_SKIP_RH;
- bool recalc_csum = true;
- __be32 *daddr = (__be32 *)&nh->daddr;
- __be32 masked[4];
- mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked);
- if (unlikely(memcmp(daddr, masked, sizeof(masked)))) {
- if (ipv6_ext_hdr(nh->nexthdr))
- recalc_csum = (ipv6_find_hdr(skb, &offset,
- NEXTHDR_ROUTING,
- NULL, &flags)
- != NEXTHDR_ROUTING);
- set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked,
- recalc_csum);
- memcpy(&flow_key->ipv6.addr.dst, masked,
- sizeof(flow_key->ipv6.addr.dst));
- }
- }
- if (mask->ipv6_tclass) {
- set_ipv6_dsfield(skb, nh, key->ipv6_tclass, mask->ipv6_tclass);
- flow_key->ip.tos = ipv6_get_dsfield(nh);
- }
- if (mask->ipv6_label) {
- set_ipv6_fl(skb, nh, ntohl(key->ipv6_label),
- ntohl(mask->ipv6_label));
- flow_key->ipv6.label =
- *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
- }
- if (mask->ipv6_hlimit) {
- set_ipv6_ttl(skb, nh, key->ipv6_hlimit, mask->ipv6_hlimit);
- flow_key->ip.ttl = nh->hop_limit;
- }
- return 0;
- }
- static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key,
- const struct nlattr *a)
- {
- struct nshhdr *nh;
- size_t length;
- int err;
- u8 flags;
- u8 ttl;
- int i;
- struct ovs_key_nsh key;
- struct ovs_key_nsh mask;
- err = nsh_key_from_nlattr(a, &key, &mask);
- if (err)
- return err;
- /* Make sure the NSH base header is there */
- if (!pskb_may_pull(skb, skb_network_offset(skb) + NSH_BASE_HDR_LEN))
- return -ENOMEM;
- nh = nsh_hdr(skb);
- length = nsh_hdr_len(nh);
- /* Make sure the whole NSH header is there */
- err = skb_ensure_writable(skb, skb_network_offset(skb) +
- length);
- if (unlikely(err))
- return err;
- nh = nsh_hdr(skb);
- skb_postpull_rcsum(skb, nh, length);
- flags = nsh_get_flags(nh);
- flags = OVS_MASKED(flags, key.base.flags, mask.base.flags);
- flow_key->nsh.base.flags = flags;
- ttl = nsh_get_ttl(nh);
- ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl);
- flow_key->nsh.base.ttl = ttl;
- nsh_set_flags_and_ttl(nh, flags, ttl);
- nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr,
- mask.base.path_hdr);
- flow_key->nsh.base.path_hdr = nh->path_hdr;
- switch (nh->mdtype) {
- case NSH_M_TYPE1:
- for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) {
- nh->md1.context[i] =
- OVS_MASKED(nh->md1.context[i], key.context[i],
- mask.context[i]);
- }
- memcpy(flow_key->nsh.context, nh->md1.context,
- sizeof(nh->md1.context));
- break;
- case NSH_M_TYPE2:
- memset(flow_key->nsh.context, 0,
- sizeof(flow_key->nsh.context));
- break;
- default:
- return -EINVAL;
- }
- skb_postpush_rcsum(skb, nh, length);
- return 0;
- }
- /* Must follow skb_ensure_writable() since that can move the skb data. */
- static void set_tp_port(struct sk_buff *skb, __be16 *port,
- __be16 new_port, __sum16 *check)
- {
- inet_proto_csum_replace2(check, skb, *port, new_port, false);
- *port = new_port;
- }
- static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key,
- const struct ovs_key_udp *key,
- const struct ovs_key_udp *mask)
- {
- struct udphdr *uh;
- __be16 src, dst;
- int err;
- err = skb_ensure_writable(skb, skb_transport_offset(skb) +
- sizeof(struct udphdr));
- if (unlikely(err))
- return err;
- uh = udp_hdr(skb);
- /* Either of the masks is non-zero, so do not bother checking them. */
- src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src);
- dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst);
- if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
- if (likely(src != uh->source)) {
- set_tp_port(skb, &uh->source, src, &uh->check);
- flow_key->tp.src = src;
- }
- if (likely(dst != uh->dest)) {
- set_tp_port(skb, &uh->dest, dst, &uh->check);
- flow_key->tp.dst = dst;
- }
- if (unlikely(!uh->check))
- uh->check = CSUM_MANGLED_0;
- } else {
- uh->source = src;
- uh->dest = dst;
- flow_key->tp.src = src;
- flow_key->tp.dst = dst;
- }
- skb_clear_hash(skb);
- return 0;
- }
- static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key,
- const struct ovs_key_tcp *key,
- const struct ovs_key_tcp *mask)
- {
- struct tcphdr *th;
- __be16 src, dst;
- int err;
- err = skb_ensure_writable(skb, skb_transport_offset(skb) +
- sizeof(struct tcphdr));
- if (unlikely(err))
- return err;
- th = tcp_hdr(skb);
- src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src);
- if (likely(src != th->source)) {
- set_tp_port(skb, &th->source, src, &th->check);
- flow_key->tp.src = src;
- }
- dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst);
- if (likely(dst != th->dest)) {
- set_tp_port(skb, &th->dest, dst, &th->check);
- flow_key->tp.dst = dst;
- }
- skb_clear_hash(skb);
- return 0;
- }
- static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key,
- const struct ovs_key_sctp *key,
- const struct ovs_key_sctp *mask)
- {
- unsigned int sctphoff = skb_transport_offset(skb);
- struct sctphdr *sh;
- __le32 old_correct_csum, new_csum, old_csum;
- int err;
- err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
- if (unlikely(err))
- return err;
- sh = sctp_hdr(skb);
- old_csum = sh->checksum;
- old_correct_csum = sctp_compute_cksum(skb, sctphoff);
- sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src);
- sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst);
- new_csum = sctp_compute_cksum(skb, sctphoff);
- /* Carry any checksum errors through. */
- sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
- skb_clear_hash(skb);
- flow_key->tp.src = sh->source;
- flow_key->tp.dst = sh->dest;
- return 0;
- }
- static int ovs_vport_output(struct net *net, struct sock *sk,
- struct sk_buff *skb)
- {
- struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage);
- struct vport *vport = data->vport;
- if (skb_cow_head(skb, data->l2_len) < 0) {
- kfree_skb(skb);
- return -ENOMEM;
- }
- __skb_dst_copy(skb, data->dst);
- *OVS_CB(skb) = data->cb;
- skb->inner_protocol = data->inner_protocol;
- if (data->vlan_tci & VLAN_CFI_MASK)
- __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK);
- else
- __vlan_hwaccel_clear_tag(skb);
- /* Reconstruct the MAC header. */
- skb_push(skb, data->l2_len);
- memcpy(skb->data, &data->l2_data, data->l2_len);
- skb_postpush_rcsum(skb, skb->data, data->l2_len);
- skb_reset_mac_header(skb);
- if (eth_p_mpls(skb->protocol)) {
- skb->inner_network_header = skb->network_header;
- skb_set_network_header(skb, data->network_offset);
- skb_reset_mac_len(skb);
- }
- ovs_vport_send(vport, skb, data->mac_proto);
- return 0;
- }
- static unsigned int
- ovs_dst_get_mtu(const struct dst_entry *dst)
- {
- return dst->dev->mtu;
- }
- static struct dst_ops ovs_dst_ops = {
- .family = AF_UNSPEC,
- .mtu = ovs_dst_get_mtu,
- };
- /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
- * ovs_vport_output(), which is called once per fragmented packet.
- */
- static void prepare_frag(struct vport *vport, struct sk_buff *skb,
- u16 orig_network_offset, u8 mac_proto)
- {
- unsigned int hlen = skb_network_offset(skb);
- struct ovs_frag_data *data;
- data = this_cpu_ptr(&ovs_frag_data_storage);
- data->dst = skb->_skb_refdst;
- data->vport = vport;
- data->cb = *OVS_CB(skb);
- data->inner_protocol = skb->inner_protocol;
- data->network_offset = orig_network_offset;
- if (skb_vlan_tag_present(skb))
- data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK;
- else
- data->vlan_tci = 0;
- data->vlan_proto = skb->vlan_proto;
- data->mac_proto = mac_proto;
- data->l2_len = hlen;
- memcpy(&data->l2_data, skb->data, hlen);
- memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
- skb_pull(skb, hlen);
- }
- static void ovs_fragment(struct net *net, struct vport *vport,
- struct sk_buff *skb, u16 mru,
- struct sw_flow_key *key)
- {
- u16 orig_network_offset = 0;
- if (eth_p_mpls(skb->protocol)) {
- orig_network_offset = skb_network_offset(skb);
- skb->network_header = skb->inner_network_header;
- }
- if (skb_network_offset(skb) > MAX_L2_LEN) {
- OVS_NLERR(1, "L2 header too long to fragment");
- goto err;
- }
- if (key->eth.type == htons(ETH_P_IP)) {
- struct rtable ovs_rt = { 0 };
- unsigned long orig_dst;
- prepare_frag(vport, skb, orig_network_offset,
- ovs_key_mac_proto(key));
- dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
- DST_OBSOLETE_NONE, DST_NOCOUNT);
- ovs_rt.dst.dev = vport->dev;
- orig_dst = skb->_skb_refdst;
- skb_dst_set_noref(skb, &ovs_rt.dst);
- IPCB(skb)->frag_max_size = mru;
- ip_do_fragment(net, skb->sk, skb, ovs_vport_output);
- refdst_drop(orig_dst);
- } else if (key->eth.type == htons(ETH_P_IPV6)) {
- unsigned long orig_dst;
- struct rt6_info ovs_rt;
- prepare_frag(vport, skb, orig_network_offset,
- ovs_key_mac_proto(key));
- memset(&ovs_rt, 0, sizeof(ovs_rt));
- dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
- DST_OBSOLETE_NONE, DST_NOCOUNT);
- ovs_rt.dst.dev = vport->dev;
- orig_dst = skb->_skb_refdst;
- skb_dst_set_noref(skb, &ovs_rt.dst);
- IP6CB(skb)->frag_max_size = mru;
- ipv6_stub->ipv6_fragment(net, skb->sk, skb, ovs_vport_output);
- refdst_drop(orig_dst);
- } else {
- WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
- ovs_vport_name(vport), ntohs(key->eth.type), mru,
- vport->dev->mtu);
- goto err;
- }
- return;
- err:
- kfree_skb(skb);
- }
- static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
- struct sw_flow_key *key)
- {
- struct vport *vport = ovs_vport_rcu(dp, out_port);
- if (likely(vport)) {
- u16 mru = OVS_CB(skb)->mru;
- u32 cutlen = OVS_CB(skb)->cutlen;
- if (unlikely(cutlen > 0)) {
- if (skb->len - cutlen > ovs_mac_header_len(key))
- pskb_trim(skb, skb->len - cutlen);
- else
- pskb_trim(skb, ovs_mac_header_len(key));
- }
- if (likely(!mru ||
- (skb->len <= mru + vport->dev->hard_header_len))) {
- ovs_vport_send(vport, skb, ovs_key_mac_proto(key));
- } else if (mru <= vport->dev->mtu) {
- struct net *net = read_pnet(&dp->net);
- ovs_fragment(net, vport, skb, mru, key);
- } else {
- kfree_skb(skb);
- }
- } else {
- kfree_skb(skb);
- }
- }
- static int output_userspace(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key, const struct nlattr *attr,
- const struct nlattr *actions, int actions_len,
- uint32_t cutlen)
- {
- struct dp_upcall_info upcall;
- const struct nlattr *a;
- int rem;
- memset(&upcall, 0, sizeof(upcall));
- upcall.cmd = OVS_PACKET_CMD_ACTION;
- upcall.mru = OVS_CB(skb)->mru;
- for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
- a = nla_next(a, &rem)) {
- switch (nla_type(a)) {
- case OVS_USERSPACE_ATTR_USERDATA:
- upcall.userdata = a;
- break;
- case OVS_USERSPACE_ATTR_PID:
- upcall.portid = nla_get_u32(a);
- break;
- case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: {
- /* Get out tunnel info. */
- struct vport *vport;
- vport = ovs_vport_rcu(dp, nla_get_u32(a));
- if (vport) {
- int err;
- err = dev_fill_metadata_dst(vport->dev, skb);
- if (!err)
- upcall.egress_tun_info = skb_tunnel_info(skb);
- }
- break;
- }
- case OVS_USERSPACE_ATTR_ACTIONS: {
- /* Include actions. */
- upcall.actions = actions;
- upcall.actions_len = actions_len;
- break;
- }
- } /* End of switch. */
- }
- return ovs_dp_upcall(dp, skb, key, &upcall, cutlen);
- }
- static int dec_ttl_exception_handler(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key,
- const struct nlattr *attr, bool last)
- {
- /* The first attribute is always 'OVS_DEC_TTL_ATTR_ACTION'. */
- struct nlattr *actions = nla_data(attr);
- if (nla_len(actions))
- return clone_execute(dp, skb, key, 0, nla_data(actions),
- nla_len(actions), last, false);
- consume_skb(skb);
- return 0;
- }
- /* When 'last' is true, sample() should always consume the 'skb'.
- * Otherwise, sample() should keep 'skb' intact regardless what
- * actions are executed within sample().
- */
- static int sample(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key, const struct nlattr *attr,
- bool last)
- {
- struct nlattr *actions;
- struct nlattr *sample_arg;
- int rem = nla_len(attr);
- const struct sample_arg *arg;
- bool clone_flow_key;
- /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */
- sample_arg = nla_data(attr);
- arg = nla_data(sample_arg);
- actions = nla_next(sample_arg, &rem);
- if ((arg->probability != U32_MAX) &&
- (!arg->probability || prandom_u32() > arg->probability)) {
- if (last)
- consume_skb(skb);
- return 0;
- }
- clone_flow_key = !arg->exec;
- return clone_execute(dp, skb, key, 0, actions, rem, last,
- clone_flow_key);
- }
- /* When 'last' is true, clone() should always consume the 'skb'.
- * Otherwise, clone() should keep 'skb' intact regardless what
- * actions are executed within clone().
- */
- static int clone(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key, const struct nlattr *attr,
- bool last)
- {
- struct nlattr *actions;
- struct nlattr *clone_arg;
- int rem = nla_len(attr);
- bool dont_clone_flow_key;
- /* The first action is always 'OVS_CLONE_ATTR_EXEC'. */
- clone_arg = nla_data(attr);
- dont_clone_flow_key = nla_get_u32(clone_arg);
- actions = nla_next(clone_arg, &rem);
- return clone_execute(dp, skb, key, 0, actions, rem, last,
- !dont_clone_flow_key);
- }
- static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
- const struct nlattr *attr)
- {
- struct ovs_action_hash *hash_act = nla_data(attr);
- u32 hash = 0;
- /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
- hash = skb_get_hash(skb);
- hash = jhash_1word(hash, hash_act->hash_basis);
- if (!hash)
- hash = 0x1;
- key->ovs_flow_hash = hash;
- }
- static int execute_set_action(struct sk_buff *skb,
- struct sw_flow_key *flow_key,
- const struct nlattr *a)
- {
- /* Only tunnel set execution is supported without a mask. */
- if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) {
- struct ovs_tunnel_info *tun = nla_data(a);
- skb_dst_drop(skb);
- dst_hold((struct dst_entry *)tun->tun_dst);
- skb_dst_set(skb, (struct dst_entry *)tun->tun_dst);
- return 0;
- }
- return -EINVAL;
- }
- /* Mask is at the midpoint of the data. */
- #define get_mask(a, type) ((const type)nla_data(a) + 1)
- static int execute_masked_set_action(struct sk_buff *skb,
- struct sw_flow_key *flow_key,
- const struct nlattr *a)
- {
- int err = 0;
- switch (nla_type(a)) {
- case OVS_KEY_ATTR_PRIORITY:
- OVS_SET_MASKED(skb->priority, nla_get_u32(a),
- *get_mask(a, u32 *));
- flow_key->phy.priority = skb->priority;
- break;
- case OVS_KEY_ATTR_SKB_MARK:
- OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *));
- flow_key->phy.skb_mark = skb->mark;
- break;
- case OVS_KEY_ATTR_TUNNEL_INFO:
- /* Masked data not supported for tunnel. */
- err = -EINVAL;
- break;
- case OVS_KEY_ATTR_ETHERNET:
- err = set_eth_addr(skb, flow_key, nla_data(a),
- get_mask(a, struct ovs_key_ethernet *));
- break;
- case OVS_KEY_ATTR_NSH:
- err = set_nsh(skb, flow_key, a);
- break;
- case OVS_KEY_ATTR_IPV4:
- err = set_ipv4(skb, flow_key, nla_data(a),
- get_mask(a, struct ovs_key_ipv4 *));
- break;
- case OVS_KEY_ATTR_IPV6:
- err = set_ipv6(skb, flow_key, nla_data(a),
- get_mask(a, struct ovs_key_ipv6 *));
- break;
- case OVS_KEY_ATTR_TCP:
- err = set_tcp(skb, flow_key, nla_data(a),
- get_mask(a, struct ovs_key_tcp *));
- break;
- case OVS_KEY_ATTR_UDP:
- err = set_udp(skb, flow_key, nla_data(a),
- get_mask(a, struct ovs_key_udp *));
- break;
- case OVS_KEY_ATTR_SCTP:
- err = set_sctp(skb, flow_key, nla_data(a),
- get_mask(a, struct ovs_key_sctp *));
- break;
- case OVS_KEY_ATTR_MPLS:
- err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
- __be32 *));
- break;
- case OVS_KEY_ATTR_CT_STATE:
- case OVS_KEY_ATTR_CT_ZONE:
- case OVS_KEY_ATTR_CT_MARK:
- case OVS_KEY_ATTR_CT_LABELS:
- case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
- case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
- err = -EINVAL;
- break;
- }
- return err;
- }
- static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key,
- const struct nlattr *a, bool last)
- {
- u32 recirc_id;
- if (!is_flow_key_valid(key)) {
- int err;
- err = ovs_flow_key_update(skb, key);
- if (err)
- return err;
- }
- BUG_ON(!is_flow_key_valid(key));
- recirc_id = nla_get_u32(a);
- return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true);
- }
- static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key,
- const struct nlattr *attr, bool last)
- {
- struct ovs_skb_cb *ovs_cb = OVS_CB(skb);
- const struct nlattr *actions, *cpl_arg;
- int len, max_len, rem = nla_len(attr);
- const struct check_pkt_len_arg *arg;
- bool clone_flow_key;
- /* The first netlink attribute in 'attr' is always
- * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
- */
- cpl_arg = nla_data(attr);
- arg = nla_data(cpl_arg);
- len = ovs_cb->mru ? ovs_cb->mru + skb->mac_len : skb->len;
- max_len = arg->pkt_len;
- if ((skb_is_gso(skb) && skb_gso_validate_mac_len(skb, max_len)) ||
- len <= max_len) {
- /* Second netlink attribute in 'attr' is always
- * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
- */
- actions = nla_next(cpl_arg, &rem);
- clone_flow_key = !arg->exec_for_lesser_equal;
- } else {
- /* Third netlink attribute in 'attr' is always
- * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'.
- */
- actions = nla_next(cpl_arg, &rem);
- actions = nla_next(actions, &rem);
- clone_flow_key = !arg->exec_for_greater;
- }
- return clone_execute(dp, skb, key, 0, nla_data(actions),
- nla_len(actions), last, clone_flow_key);
- }
- static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key)
- {
- int err;
- if (skb->protocol == htons(ETH_P_IPV6)) {
- struct ipv6hdr *nh;
- err = skb_ensure_writable(skb, skb_network_offset(skb) +
- sizeof(*nh));
- if (unlikely(err))
- return err;
- nh = ipv6_hdr(skb);
- if (nh->hop_limit <= 1)
- return -EHOSTUNREACH;
- key->ip.ttl = --nh->hop_limit;
- } else if (skb->protocol == htons(ETH_P_IP)) {
- struct iphdr *nh;
- u8 old_ttl;
- err = skb_ensure_writable(skb, skb_network_offset(skb) +
- sizeof(*nh));
- if (unlikely(err))
- return err;
- nh = ip_hdr(skb);
- if (nh->ttl <= 1)
- return -EHOSTUNREACH;
- old_ttl = nh->ttl--;
- csum_replace2(&nh->check, htons(old_ttl << 8),
- htons(nh->ttl << 8));
- key->ip.ttl = nh->ttl;
- }
- return 0;
- }
- /* Execute a list of actions against 'skb'. */
- static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key,
- const struct nlattr *attr, int len)
- {
- const struct nlattr *a;
- int rem;
- for (a = attr, rem = len; rem > 0;
- a = nla_next(a, &rem)) {
- int err = 0;
- switch (nla_type(a)) {
- case OVS_ACTION_ATTR_OUTPUT: {
- int port = nla_get_u32(a);
- struct sk_buff *clone;
- /* Every output action needs a separate clone
- * of 'skb', In case the output action is the
- * last action, cloning can be avoided.
- */
- if (nla_is_last(a, rem)) {
- do_output(dp, skb, port, key);
- /* 'skb' has been used for output.
- */
- return 0;
- }
- clone = skb_clone(skb, GFP_ATOMIC);
- if (clone)
- do_output(dp, clone, port, key);
- OVS_CB(skb)->cutlen = 0;
- break;
- }
- case OVS_ACTION_ATTR_TRUNC: {
- struct ovs_action_trunc *trunc = nla_data(a);
- if (skb->len > trunc->max_len)
- OVS_CB(skb)->cutlen = skb->len - trunc->max_len;
- break;
- }
- case OVS_ACTION_ATTR_USERSPACE:
- output_userspace(dp, skb, key, a, attr,
- len, OVS_CB(skb)->cutlen);
- OVS_CB(skb)->cutlen = 0;
- break;
- case OVS_ACTION_ATTR_HASH:
- execute_hash(skb, key, a);
- break;
- case OVS_ACTION_ATTR_PUSH_MPLS: {
- struct ovs_action_push_mpls *mpls = nla_data(a);
- err = push_mpls(skb, key, mpls->mpls_lse,
- mpls->mpls_ethertype, skb->mac_len);
- break;
- }
- case OVS_ACTION_ATTR_ADD_MPLS: {
- struct ovs_action_add_mpls *mpls = nla_data(a);
- __u16 mac_len = 0;
- if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK)
- mac_len = skb->mac_len;
- err = push_mpls(skb, key, mpls->mpls_lse,
- mpls->mpls_ethertype, mac_len);
- break;
- }
- case OVS_ACTION_ATTR_POP_MPLS:
- err = pop_mpls(skb, key, nla_get_be16(a));
- break;
- case OVS_ACTION_ATTR_PUSH_VLAN:
- err = push_vlan(skb, key, nla_data(a));
- break;
- case OVS_ACTION_ATTR_POP_VLAN:
- err = pop_vlan(skb, key);
- break;
- case OVS_ACTION_ATTR_RECIRC: {
- bool last = nla_is_last(a, rem);
- err = execute_recirc(dp, skb, key, a, last);
- if (last) {
- /* If this is the last action, the skb has
- * been consumed or freed.
- * Return immediately.
- */
- return err;
- }
- break;
- }
- case OVS_ACTION_ATTR_SET:
- err = execute_set_action(skb, key, nla_data(a));
- break;
- case OVS_ACTION_ATTR_SET_MASKED:
- case OVS_ACTION_ATTR_SET_TO_MASKED:
- err = execute_masked_set_action(skb, key, nla_data(a));
- break;
- case OVS_ACTION_ATTR_SAMPLE: {
- bool last = nla_is_last(a, rem);
- err = sample(dp, skb, key, a, last);
- if (last)
- return err;
- break;
- }
- case OVS_ACTION_ATTR_CT:
- if (!is_flow_key_valid(key)) {
- err = ovs_flow_key_update(skb, key);
- if (err)
- return err;
- }
- err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key,
- nla_data(a));
- /* Hide stolen IP fragments from user space. */
- if (err)
- return err == -EINPROGRESS ? 0 : err;
- break;
- case OVS_ACTION_ATTR_CT_CLEAR:
- err = ovs_ct_clear(skb, key);
- break;
- case OVS_ACTION_ATTR_PUSH_ETH:
- err = push_eth(skb, key, nla_data(a));
- break;
- case OVS_ACTION_ATTR_POP_ETH:
- err = pop_eth(skb, key);
- break;
- case OVS_ACTION_ATTR_PUSH_NSH: {
- u8 buffer[NSH_HDR_MAX_LEN];
- struct nshhdr *nh = (struct nshhdr *)buffer;
- err = nsh_hdr_from_nlattr(nla_data(a), nh,
- NSH_HDR_MAX_LEN);
- if (unlikely(err))
- break;
- err = push_nsh(skb, key, nh);
- break;
- }
- case OVS_ACTION_ATTR_POP_NSH:
- err = pop_nsh(skb, key);
- break;
- case OVS_ACTION_ATTR_METER:
- if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) {
- consume_skb(skb);
- return 0;
- }
- break;
- case OVS_ACTION_ATTR_CLONE: {
- bool last = nla_is_last(a, rem);
- err = clone(dp, skb, key, a, last);
- if (last)
- return err;
- break;
- }
- case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
- bool last = nla_is_last(a, rem);
- err = execute_check_pkt_len(dp, skb, key, a, last);
- if (last)
- return err;
- break;
- }
- case OVS_ACTION_ATTR_DEC_TTL:
- err = execute_dec_ttl(skb, key);
- if (err == -EHOSTUNREACH) {
- err = dec_ttl_exception_handler(dp, skb, key,
- a, true);
- return err;
- }
- break;
- }
- if (unlikely(err)) {
- kfree_skb(skb);
- return err;
- }
- }
- consume_skb(skb);
- return 0;
- }
- /* Execute the actions on the clone of the packet. The effect of the
- * execution does not affect the original 'skb' nor the original 'key'.
- *
- * The execution may be deferred in case the actions can not be executed
- * immediately.
- */
- static int clone_execute(struct datapath *dp, struct sk_buff *skb,
- struct sw_flow_key *key, u32 recirc_id,
- const struct nlattr *actions, int len,
- bool last, bool clone_flow_key)
- {
- struct deferred_action *da;
- struct sw_flow_key *clone;
- skb = last ? skb : skb_clone(skb, GFP_ATOMIC);
- if (!skb) {
- /* Out of memory, skip this action.
- */
- return 0;
- }
- /* When clone_flow_key is false, the 'key' will not be change
- * by the actions, then the 'key' can be used directly.
- * Otherwise, try to clone key from the next recursion level of
- * 'flow_keys'. If clone is successful, execute the actions
- * without deferring.
- */
- clone = clone_flow_key ? clone_key(key) : key;
- if (clone) {
- int err = 0;
- if (actions) { /* Sample action */
- if (clone_flow_key)
- __this_cpu_inc(exec_actions_level);
- err = do_execute_actions(dp, skb, clone,
- actions, len);
- if (clone_flow_key)
- __this_cpu_dec(exec_actions_level);
- } else { /* Recirc action */
- clone->recirc_id = recirc_id;
- ovs_dp_process_packet(skb, clone);
- }
- return err;
- }
- /* Out of 'flow_keys' space. Defer actions */
- da = add_deferred_actions(skb, key, actions, len);
- if (da) {
- if (!actions) { /* Recirc action */
- key = &da->pkt_key;
- key->recirc_id = recirc_id;
- }
- } else {
- /* Out of per CPU action FIFO space. Drop the 'skb' and
- * log an error.
- */
- kfree_skb(skb);
- if (net_ratelimit()) {
- if (actions) { /* Sample action */
- pr_warn("%s: deferred action limit reached, drop sample action\n",
- ovs_dp_name(dp));
- } else { /* Recirc action */
- pr_warn("%s: deferred action limit reached, drop recirc action\n",
- ovs_dp_name(dp));
- }
- }
- }
- return 0;
- }
- static void process_deferred_actions(struct datapath *dp)
- {
- struct action_fifo *fifo = this_cpu_ptr(action_fifos);
- /* Do not touch the FIFO in case there is no deferred actions. */
- if (action_fifo_is_empty(fifo))
- return;
- /* Finishing executing all deferred actions. */
- do {
- struct deferred_action *da = action_fifo_get(fifo);
- struct sk_buff *skb = da->skb;
- struct sw_flow_key *key = &da->pkt_key;
- const struct nlattr *actions = da->actions;
- int actions_len = da->actions_len;
- if (actions)
- do_execute_actions(dp, skb, key, actions, actions_len);
- else
- ovs_dp_process_packet(skb, key);
- } while (!action_fifo_is_empty(fifo));
- /* Reset FIFO for the next packet. */
- action_fifo_init(fifo);
- }
- /* Execute a list of actions against 'skb'. */
- int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
- const struct sw_flow_actions *acts,
- struct sw_flow_key *key)
- {
- int err, level;
- level = __this_cpu_inc_return(exec_actions_level);
- if (unlikely(level > OVS_RECURSION_LIMIT)) {
- net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
- ovs_dp_name(dp));
- kfree_skb(skb);
- err = -ENETDOWN;
- goto out;
- }
- OVS_CB(skb)->acts_origlen = acts->orig_len;
- err = do_execute_actions(dp, skb, key,
- acts->actions, acts->actions_len);
- if (level == 1)
- process_deferred_actions(dp);
- out:
- __this_cpu_dec(exec_actions_level);
- return err;
- }
- int action_fifos_init(void)
- {
- action_fifos = alloc_percpu(struct action_fifo);
- if (!action_fifos)
- return -ENOMEM;
- flow_keys = alloc_percpu(struct action_flow_keys);
- if (!flow_keys) {
- free_percpu(action_fifos);
- return -ENOMEM;
- }
- return 0;
- }
- void action_fifos_exit(void)
- {
- free_percpu(action_fifos);
- free_percpu(flow_keys);
- }
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