/*
- * Copyright (c) 2007-2014 Nicira, Inc.
+ * Copyright (c) 2007-2015 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
* 02110-1301, USA
*/
-#include "flow.h"
-#include "datapath.h"
#include <linux/uaccess.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/module.h>
#include <linux/in.h>
#include <linux/rcupdate.h>
+#include <linux/cpumask.h>
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
+#include <linux/mpls.h>
#include <linux/sctp.h>
#include <linux/smp.h>
#include <linux/tcp.h>
#include <linux/icmp.h>
#include <linux/icmpv6.h>
#include <linux/rculist.h>
+#include <linux/timekeeping.h>
#include <net/ip.h>
#include <net/ipv6.h>
+#include <net/mpls.h>
#include <net/ndisc.h>
+#include <net/nsh.h>
-#include "vlan.h"
+#include "datapath.h"
+#include "conntrack.h"
+#include "flow.h"
+#include "flow_netlink.h"
+#include "vport.h"
u64 ovs_flow_used_time(unsigned long flow_jiffies)
{
- struct timespec cur_ts;
+ struct timespec64 cur_ts;
u64 cur_ms, idle_ms;
- ktime_get_ts(&cur_ts);
+ ktime_get_ts64(&cur_ts);
idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
- cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
+ cur_ms = (u64)(u32)cur_ts.tv_sec * MSEC_PER_SEC +
cur_ts.tv_nsec / NSEC_PER_MSEC;
return cur_ms - idle_ms;
#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
-void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
+void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
+ const struct sk_buff *skb)
{
struct flow_stats *stats;
- __be16 tcp_flags = flow->key.tp.flags;
- int node = numa_node_id();
+ unsigned int cpu = smp_processor_id();
+ int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
- stats = rcu_dereference(flow->stats[node]);
+ stats = rcu_dereference(flow->stats[cpu]);
- /* Check if already have node-specific stats. */
+ /* Check if already have CPU-specific stats. */
if (likely(stats)) {
spin_lock(&stats->lock);
/* Mark if we write on the pre-allocated stats. */
- if (node == 0 && unlikely(flow->stats_last_writer != node))
- flow->stats_last_writer = node;
+ if (cpu == 0 && unlikely(flow->stats_last_writer != cpu))
+ flow->stats_last_writer = cpu;
} else {
stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
spin_lock(&stats->lock);
- /* If the current NUMA-node is the only writer on the
+ /* If the current CPU is the only writer on the
* pre-allocated stats keep using them.
*/
- if (unlikely(flow->stats_last_writer != node)) {
+ if (unlikely(flow->stats_last_writer != cpu)) {
/* A previous locker may have already allocated the
- * stats, so we need to check again. If node-specific
+ * stats, so we need to check again. If CPU-specific
* stats were already allocated, we update the pre-
* allocated stats as we have already locked them.
*/
- if (likely(flow->stats_last_writer != NUMA_NO_NODE)
- && likely(!rcu_dereference(flow->stats[node]))) {
- /* Try to allocate node-specific stats. */
+ if (likely(flow->stats_last_writer != -1) &&
+ likely(!rcu_access_pointer(flow->stats[cpu]))) {
+ /* Try to allocate CPU-specific stats. */
struct flow_stats *new_stats;
new_stats =
kmem_cache_alloc_node(flow_stats_cache,
- GFP_THISNODE |
+ GFP_NOWAIT |
+ __GFP_THISNODE |
+ __GFP_NOWARN |
__GFP_NOMEMALLOC,
- node);
+ numa_node_id());
if (likely(new_stats)) {
new_stats->used = jiffies;
new_stats->packet_count = 1;
- new_stats->byte_count = skb->len;
+ new_stats->byte_count = len;
new_stats->tcp_flags = tcp_flags;
spin_lock_init(&new_stats->lock);
- rcu_assign_pointer(flow->stats[node],
+ rcu_assign_pointer(flow->stats[cpu],
new_stats);
+ cpumask_set_cpu(cpu, &flow->cpu_used_mask);
goto unlock;
}
}
- flow->stats_last_writer = node;
+ flow->stats_last_writer = cpu;
}
}
stats->used = jiffies;
stats->packet_count++;
- stats->byte_count += skb->len;
+ stats->byte_count += len;
stats->tcp_flags |= tcp_flags;
unlock:
spin_unlock(&stats->lock);
struct ovs_flow_stats *ovs_stats,
unsigned long *used, __be16 *tcp_flags)
{
- int node;
+ int cpu;
*used = 0;
*tcp_flags = 0;
memset(ovs_stats, 0, sizeof(*ovs_stats));
- for_each_node(node) {
- struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
+ /* We open code this to make sure cpu 0 is always considered */
+ for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
+ struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[cpu]);
if (stats) {
/* Local CPU may write on non-local stats, so we must
/* Called with ovs_mutex. */
void ovs_flow_stats_clear(struct sw_flow *flow)
{
- int node;
+ int cpu;
- for_each_node(node) {
- struct flow_stats *stats = ovsl_dereference(flow->stats[node]);
+ /* We open code this to make sure cpu 0 is always considered */
+ for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
+ struct flow_stats *stats = ovsl_dereference(flow->stats[cpu]);
if (stats) {
spin_lock_bh(&stats->lock);
static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
{
+ unsigned short frag_off;
+ unsigned int payload_ofs = 0;
unsigned int nh_ofs = skb_network_offset(skb);
unsigned int nh_len;
- int payload_ofs;
struct ipv6hdr *nh;
- uint8_t nexthdr;
- __be16 frag_off;
- int err;
+ int err, nexthdr, flags = 0;
err = check_header(skb, nh_ofs + sizeof(*nh));
if (unlikely(err))
return err;
nh = ipv6_hdr(skb);
- nexthdr = nh->nexthdr;
- payload_ofs = (u8 *)(nh + 1) - skb->data;
key->ip.proto = NEXTHDR_NONE;
key->ip.tos = ipv6_get_dsfield(nh);
key->ipv6.addr.src = nh->saddr;
key->ipv6.addr.dst = nh->daddr;
- payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
- if (unlikely(payload_ofs < 0))
- return -EINVAL;
-
- if (frag_off) {
- if (frag_off & htons(~0x7))
+ nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
+ if (flags & IP6_FH_F_FRAG) {
+ if (frag_off) {
key->ip.frag = OVS_FRAG_TYPE_LATER;
- else
- key->ip.frag = OVS_FRAG_TYPE_FIRST;
+ key->ip.proto = nexthdr;
+ return 0;
+ }
+ key->ip.frag = OVS_FRAG_TYPE_FIRST;
+ } else {
+ key->ip.frag = OVS_FRAG_TYPE_NONE;
}
+ /* Delayed handling of error in ipv6_find_hdr() as it
+ * always sets flags and frag_off to a valid value which may be
+ * used to set key->ip.frag above.
+ */
+ if (unlikely(nexthdr < 0))
+ return -EPROTO;
+
nh_len = payload_ofs - nh_ofs;
skb_set_transport_header(skb, nh_ofs + nh_len);
key->ip.proto = nexthdr;
sizeof(struct icmp6hdr));
}
-static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
+/**
+ * Parse vlan tag from vlan header.
+ * Returns ERROR on memory error.
+ * Returns 0 if it encounters a non-vlan or incomplete packet.
+ * Returns 1 after successfully parsing vlan tag.
+ */
+static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *key_vh,
+ bool untag_vlan)
{
- struct qtag_prefix {
- __be16 eth_type; /* ETH_P_8021Q */
- __be16 tci;
- };
- struct qtag_prefix *qp;
+ struct vlan_head *vh = (struct vlan_head *)skb->data;
- if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
+ if (likely(!eth_type_vlan(vh->tpid)))
return 0;
- if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
- sizeof(__be16))))
+ if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16)))
+ return 0;
+
+ if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) +
+ sizeof(__be16))))
return -ENOMEM;
- qp = (struct qtag_prefix *) skb->data;
- key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
- __skb_pull(skb, sizeof(struct qtag_prefix));
+ vh = (struct vlan_head *)skb->data;
+ key_vh->tci = vh->tci | htons(VLAN_CFI_MASK);
+ key_vh->tpid = vh->tpid;
+
+ if (unlikely(untag_vlan)) {
+ int offset = skb->data - skb_mac_header(skb);
+ u16 tci;
+ int err;
+
+ __skb_push(skb, offset);
+ err = __skb_vlan_pop(skb, &tci);
+ __skb_pull(skb, offset);
+ if (err)
+ return err;
+ __vlan_hwaccel_put_tag(skb, key_vh->tpid, tci);
+ } else {
+ __skb_pull(skb, sizeof(struct vlan_head));
+ }
+ return 1;
+}
+
+static void clear_vlan(struct sw_flow_key *key)
+{
+ key->eth.vlan.tci = 0;
+ key->eth.vlan.tpid = 0;
+ key->eth.cvlan.tci = 0;
+ key->eth.cvlan.tpid = 0;
+}
+
+static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ int res;
+
+ key->eth.vlan.tci = 0;
+ key->eth.vlan.tpid = 0;
+ key->eth.cvlan.tci = 0;
+ key->eth.cvlan.tpid = 0;
+
+ if (skb_vlan_tag_present(skb)) {
+ key->eth.vlan.tci = htons(skb->vlan_tci) | htons(VLAN_CFI_MASK);
+ key->eth.vlan.tpid = skb->vlan_proto;
+ } else {
+ /* Parse outer vlan tag in the non-accelerated case. */
+ res = parse_vlan_tag(skb, &key->eth.vlan, true);
+ if (res <= 0)
+ return res;
+ }
+
+ /* Parse inner vlan tag. */
+ res = parse_vlan_tag(skb, &key->eth.cvlan, false);
+ if (res <= 0)
+ return res;
return 0;
}
proto = *(__be16 *) skb->data;
__skb_pull(skb, sizeof(__be16));
- if (ntohs(proto) >= ETH_P_802_3_MIN)
+ if (eth_proto_is_802_3(proto))
return proto;
if (skb->len < sizeof(struct llc_snap_hdr))
__skb_pull(skb, sizeof(struct llc_snap_hdr));
- if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
+ if (eth_proto_is_802_3(llc->ethertype))
return llc->ethertype;
return htons(ETH_P_802_2);
*/
key->tp.src = htons(icmp->icmp6_type);
key->tp.dst = htons(icmp->icmp6_code);
+ memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
if (icmp->icmp6_code == 0 &&
(icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
goto invalid;
ether_addr_copy(key->ipv6.nd.sll,
- &nd->opt[offset+sizeof(*nd_opt)]);
+ &nd->opt[offset+sizeof(*nd_opt)]);
} else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
&& opt_len == 8) {
if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
goto invalid;
ether_addr_copy(key->ipv6.nd.tll,
- &nd->opt[offset+sizeof(*nd_opt)]);
+ &nd->opt[offset+sizeof(*nd_opt)]);
}
icmp_len -= opt_len;
return 0;
}
-/**
- * ovs_flow_extract - extracts a flow key from an Ethernet frame.
- * @skb: sk_buff that contains the frame, with skb->data pointing to the
- * Ethernet header
- * @in_port: port number on which @skb was received.
- * @key: output flow key
- *
- * The caller must ensure that skb->len >= ETH_HLEN.
- *
- * Returns 0 if successful, otherwise a negative errno value.
- *
- * Initializes @skb header pointers as follows:
- *
- * - skb->mac_header: the Ethernet header.
- *
- * - skb->network_header: just past the Ethernet header, or just past the
- * VLAN header, to the first byte of the Ethernet payload.
- *
- * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
- * on output, then just past the IP header, if one is present and
- * of a correct length, otherwise the same as skb->network_header.
- * For other key->eth.type values it is left untouched.
- */
-int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
+static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key)
{
- int error;
- struct ethhdr *eth;
-
- memset(key, 0, sizeof(*key));
+ struct nshhdr *nh;
+ unsigned int nh_ofs = skb_network_offset(skb);
+ u8 version, length;
+ int err;
- key->phy.priority = skb->priority;
- if (OVS_CB(skb)->tun_key)
- memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
- key->phy.in_port = in_port;
- key->phy.skb_mark = skb->mark;
+ err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN);
+ if (unlikely(err))
+ return err;
- skb_reset_mac_header(skb);
+ nh = nsh_hdr(skb);
+ version = nsh_get_ver(nh);
+ length = nsh_hdr_len(nh);
- /* Link layer. We are guaranteed to have at least the 14 byte Ethernet
- * header in the linear data area.
- */
- eth = eth_hdr(skb);
- ether_addr_copy(key->eth.src, eth->h_source);
- ether_addr_copy(key->eth.dst, eth->h_dest);
+ if (version != 0)
+ return -EINVAL;
- __skb_pull(skb, 2 * ETH_ALEN);
- /* We are going to push all headers that we pull, so no need to
- * update skb->csum here. */
+ err = check_header(skb, nh_ofs + length);
+ if (unlikely(err))
+ return err;
- if (vlan_tx_tag_present(skb))
- key->eth.tci = htons(vlan_get_tci(skb));
- else if (eth->h_proto == htons(ETH_P_8021Q))
- if (unlikely(parse_vlan(skb, key)))
- return -ENOMEM;
+ nh = nsh_hdr(skb);
+ key->nsh.base.flags = nsh_get_flags(nh);
+ key->nsh.base.ttl = nsh_get_ttl(nh);
+ key->nsh.base.mdtype = nh->mdtype;
+ key->nsh.base.np = nh->np;
+ key->nsh.base.path_hdr = nh->path_hdr;
+ switch (key->nsh.base.mdtype) {
+ case NSH_M_TYPE1:
+ if (length != NSH_M_TYPE1_LEN)
+ return -EINVAL;
+ memcpy(key->nsh.context, nh->md1.context,
+ sizeof(nh->md1));
+ break;
+ case NSH_M_TYPE2:
+ memset(key->nsh.context, 0,
+ sizeof(nh->md1));
+ break;
+ default:
+ return -EINVAL;
+ }
- key->eth.type = parse_ethertype(skb);
- if (unlikely(key->eth.type == htons(0)))
- return -ENOMEM;
+ return 0;
+}
- skb_reset_network_header(skb);
- __skb_push(skb, skb->data - skb_mac_header(skb));
+/**
+ * key_extract_l3l4 - extracts L3/L4 header information.
+ * @skb: sk_buff that contains the frame, with skb->data pointing to the
+ * L3 header
+ * @key: output flow key
+ */
+static int key_extract_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ int error;
/* Network layer. */
if (key->eth.type == htons(ETH_P_IP)) {
error = check_iphdr(skb);
if (unlikely(error)) {
+ memset(&key->ip, 0, sizeof(key->ip));
+ memset(&key->ipv4, 0, sizeof(key->ipv4));
if (error == -EINVAL) {
skb->transport_header = skb->network_header;
error = 0;
offset = nh->frag_off & htons(IP_OFFSET);
if (offset) {
key->ip.frag = OVS_FRAG_TYPE_LATER;
+ memset(&key->tp, 0, sizeof(key->tp));
return 0;
}
+#ifdef HAVE_SKB_GSO_UDP
if (nh->frag_off & htons(IP_MF) ||
- skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+ skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+#else
+ if (nh->frag_off & htons(IP_MF))
+#endif
key->ip.frag = OVS_FRAG_TYPE_FIRST;
+ else
+ key->ip.frag = OVS_FRAG_TYPE_NONE;
/* Transport layer. */
if (key->ip.proto == IPPROTO_TCP) {
key->tp.src = tcp->source;
key->tp.dst = tcp->dest;
key->tp.flags = TCP_FLAGS_BE16(tcp);
+ } else {
+ memset(&key->tp, 0, sizeof(key->tp));
}
+
} else if (key->ip.proto == IPPROTO_UDP) {
if (udphdr_ok(skb)) {
struct udphdr *udp = udp_hdr(skb);
key->tp.src = udp->source;
key->tp.dst = udp->dest;
+ } else {
+ memset(&key->tp, 0, sizeof(key->tp));
}
} else if (key->ip.proto == IPPROTO_SCTP) {
if (sctphdr_ok(skb)) {
struct sctphdr *sctp = sctp_hdr(skb);
key->tp.src = sctp->source;
key->tp.dst = sctp->dest;
+ } else {
+ memset(&key->tp, 0, sizeof(key->tp));
}
} else if (key->ip.proto == IPPROTO_ICMP) {
if (icmphdr_ok(skb)) {
struct icmphdr *icmp = icmp_hdr(skb);
/* The ICMP type and code fields use the 16-bit
* transport port fields, so we need to store
- * them in 16-bit network byte order. */
+ * them in 16-bit network byte order.
+ */
key->tp.src = htons(icmp->type);
key->tp.dst = htons(icmp->code);
+ } else {
+ memset(&key->tp, 0, sizeof(key->tp));
}
}
- } else if ((key->eth.type == htons(ETH_P_ARP) ||
- key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
+ } else if (key->eth.type == htons(ETH_P_ARP) ||
+ key->eth.type == htons(ETH_P_RARP)) {
struct arp_eth_header *arp;
+ bool arp_available = arphdr_ok(skb);
arp = (struct arp_eth_header *)skb_network_header(skb);
- if (arp->ar_hrd == htons(ARPHRD_ETHER)
- && arp->ar_pro == htons(ETH_P_IP)
- && arp->ar_hln == ETH_ALEN
- && arp->ar_pln == 4) {
+ if (arp_available &&
+ arp->ar_hrd == htons(ARPHRD_ETHER) &&
+ arp->ar_pro == htons(ETH_P_IP) &&
+ arp->ar_hln == ETH_ALEN &&
+ arp->ar_pln == 4) {
/* We only match on the lower 8 bits of the opcode. */
if (ntohs(arp->ar_op) <= 0xff)
key->ip.proto = ntohs(arp->ar_op);
+ else
+ key->ip.proto = 0;
+
memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
+ } else {
+ memset(&key->ip, 0, sizeof(key->ip));
+ memset(&key->ipv4, 0, sizeof(key->ipv4));
+ }
+ } else if (eth_p_mpls(key->eth.type)) {
+ size_t stack_len = MPLS_HLEN;
+
+ skb_set_inner_network_header(skb, skb->mac_len);
+ while (1) {
+ __be32 lse;
+
+ error = check_header(skb, skb->mac_len + stack_len);
+ if (unlikely(error))
+ return 0;
+
+ memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN);
+
+ if (stack_len == MPLS_HLEN)
+ memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN);
+
+ skb_set_inner_network_header(skb, skb->mac_len + stack_len);
+ if (lse & htonl(MPLS_LS_S_MASK))
+ break;
+
+ stack_len += MPLS_HLEN;
}
} else if (key->eth.type == htons(ETH_P_IPV6)) {
int nh_len; /* IPv6 Header + Extensions */
nh_len = parse_ipv6hdr(skb, key);
if (unlikely(nh_len < 0)) {
- if (nh_len == -EINVAL) {
+ switch (nh_len) {
+ case -EINVAL:
+ memset(&key->ip, 0, sizeof(key->ip));
+ memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
+ /* fall-through */
+ case -EPROTO:
skb->transport_header = skb->network_header;
error = 0;
- } else {
+ break;
+ default:
error = nh_len;
}
return error;
}
- if (key->ip.frag == OVS_FRAG_TYPE_LATER)
+ if (key->ip.frag == OVS_FRAG_TYPE_LATER) {
+ memset(&key->tp, 0, sizeof(key->tp));
return 0;
+ }
+#ifdef HAVE_SKB_GSO_UDP
if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
key->ip.frag = OVS_FRAG_TYPE_FIRST;
+#endif
/* Transport layer. */
if (key->ip.proto == NEXTHDR_TCP) {
if (tcphdr_ok(skb)) {
key->tp.src = tcp->source;
key->tp.dst = tcp->dest;
key->tp.flags = TCP_FLAGS_BE16(tcp);
+ } else {
+ memset(&key->tp, 0, sizeof(key->tp));
}
} else if (key->ip.proto == NEXTHDR_UDP) {
if (udphdr_ok(skb)) {
struct udphdr *udp = udp_hdr(skb);
key->tp.src = udp->source;
key->tp.dst = udp->dest;
+ } else {
+ memset(&key->tp, 0, sizeof(key->tp));
}
} else if (key->ip.proto == NEXTHDR_SCTP) {
if (sctphdr_ok(skb)) {
struct sctphdr *sctp = sctp_hdr(skb);
key->tp.src = sctp->source;
key->tp.dst = sctp->dest;
+ } else {
+ memset(&key->tp, 0, sizeof(key->tp));
}
} else if (key->ip.proto == NEXTHDR_ICMP) {
if (icmp6hdr_ok(skb)) {
error = parse_icmpv6(skb, key, nh_len);
if (error)
return error;
+ } else {
+ memset(&key->tp, 0, sizeof(key->tp));
}
}
+ } else if (key->eth.type == htons(ETH_P_NSH)) {
+ error = parse_nsh(skb, key);
+ if (error)
+ return error;
+ }
+ return 0;
+}
+
+/**
+ * key_extract - extracts a flow key from an Ethernet frame.
+ * @skb: sk_buff that contains the frame, with skb->data pointing to the
+ * Ethernet header
+ * @key: output flow key
+ *
+ * The caller must ensure that skb->len >= ETH_HLEN.
+ *
+ * Returns 0 if successful, otherwise a negative errno value.
+ *
+ * Initializes @skb header fields as follows:
+ *
+ * - skb->mac_header: the L2 header.
+ *
+ * - skb->network_header: just past the L2 header, or just past the
+ * VLAN header, to the first byte of the L2 payload.
+ *
+ * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
+ * on output, then just past the IP header, if one is present and
+ * of a correct length, otherwise the same as skb->network_header.
+ * For other key->eth.type values it is left untouched.
+ *
+ * - skb->protocol: the type of the data starting at skb->network_header.
+ * Equals to key->eth.type.
+ */
+static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ struct ethhdr *eth;
+
+ /* Flags are always used as part of stats */
+ key->tp.flags = 0;
+
+ skb_reset_mac_header(skb);
+
+ /* Link layer. */
+ clear_vlan(key);
+ if (ovs_key_mac_proto(key) == MAC_PROTO_NONE) {
+ if (unlikely(eth_type_vlan(skb->protocol)))
+ return -EINVAL;
+
+ skb_reset_network_header(skb);
+ key->eth.type = skb->protocol;
+ } else {
+ eth = eth_hdr(skb);
+ ether_addr_copy(key->eth.src, eth->h_source);
+ ether_addr_copy(key->eth.dst, eth->h_dest);
+
+ __skb_pull(skb, 2 * ETH_ALEN);
+ /* We are going to push all headers that we pull, so no need to
+ * update skb->csum here.
+ */
+
+ if (unlikely(parse_vlan(skb, key)))
+ return -ENOMEM;
+
+ key->eth.type = parse_ethertype(skb);
+ if (unlikely(key->eth.type == htons(0)))
+ return -ENOMEM;
+
+ /* Multiple tagged packets need to retain TPID to satisfy
+ * skb_vlan_pop(), which will later shift the ethertype into
+ * skb->protocol.
+ */
+ if (key->eth.cvlan.tci & htons(VLAN_CFI_MASK))
+ skb->protocol = key->eth.cvlan.tpid;
+ else
+ skb->protocol = key->eth.type;
+
+ skb_reset_network_header(skb);
+ __skb_push(skb, skb->data - skb_mac_header(skb));
+ }
+
+ skb_reset_mac_len(skb);
+
+ /* Fill out L3/L4 key info, if any */
+ return key_extract_l3l4(skb, key);
+}
+
+/* In the case of conntrack fragment handling it expects L3 headers,
+ * add a helper.
+ */
+int ovs_flow_key_update_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ return key_extract_l3l4(skb, key);
+}
+
+int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ int res;
+
+ res = key_extract(skb, key);
+ if (!res)
+ key->mac_proto &= ~SW_FLOW_KEY_INVALID;
+
+ return res;
+}
+
+static int key_extract_mac_proto(struct sk_buff *skb)
+{
+ switch (skb->dev->type) {
+ case ARPHRD_ETHER:
+ return MAC_PROTO_ETHERNET;
+ case ARPHRD_NONE:
+ if (skb->protocol == htons(ETH_P_TEB))
+ return MAC_PROTO_ETHERNET;
+ return MAC_PROTO_NONE;
+ }
+ WARN_ON_ONCE(1);
+ return -EINVAL;
+}
+
+int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
+ struct sk_buff *skb, struct sw_flow_key *key)
+{
+ int res, err;
+
+ /* Extract metadata from packet. */
+ if (tun_info) {
+ key->tun_proto = ip_tunnel_info_af(tun_info);
+ memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
+ BUILD_BUG_ON(((1 << (sizeof(tun_info->options_len) * 8)) - 1) >
+ sizeof(key->tun_opts));
+
+ if (tun_info->options_len) {
+ ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
+ tun_info);
+ key->tun_opts_len = tun_info->options_len;
+ } else {
+ key->tun_opts_len = 0;
+ }
+ } else {
+ key->tun_proto = 0;
+ key->tun_opts_len = 0;
+ memset(&key->tun_key, 0, sizeof(key->tun_key));
}
+ key->phy.priority = skb->priority;
+ key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
+ key->phy.skb_mark = skb->mark;
+ key->ovs_flow_hash = 0;
+ res = key_extract_mac_proto(skb);
+ if (res < 0)
+ return res;
+ key->mac_proto = res;
+ key->recirc_id = 0;
+
+ err = key_extract(skb, key);
+ if (!err)
+ ovs_ct_fill_key(skb, key); /* Must be after key_extract(). */
+ return err;
+}
+
+int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
+ struct sk_buff *skb,
+ struct sw_flow_key *key, bool log)
+{
+ const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
+ u64 attrs = 0;
+ int err;
+
+ err = parse_flow_nlattrs(attr, a, &attrs, log);
+ if (err)
+ return -EINVAL;
+
+ /* Extract metadata from netlink attributes. */
+ err = ovs_nla_get_flow_metadata(net, a, attrs, key, log);
+ if (err)
+ return err;
+
+ /* key_extract assumes that skb->protocol is set-up for
+ * layer 3 packets which is the case for other callers,
+ * in particular packets received from the network stack.
+ * Here the correct value can be set from the metadata
+ * extracted above.
+ * For L2 packet key eth type would be zero. skb protocol
+ * would be set to correct value later during key-extact.
+ */
+
+ skb->protocol = key->eth.type;
+ err = key_extract(skb, key);
+ if (err)
+ return err;
+
+ /* Check that we have conntrack original direction tuple metadata only
+ * for packets for which it makes sense. Otherwise the key may be
+ * corrupted due to overlapping key fields.
+ */
+ if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) &&
+ key->eth.type != htons(ETH_P_IP))
+ return -EINVAL;
+ if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) &&
+ (key->eth.type != htons(ETH_P_IPV6) ||
+ sw_flow_key_is_nd(key)))
+ return -EINVAL;
+
return 0;
}
projects / ovs.git / blobdiff