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-rw-r--r--net/openvswitch/flow.c951
1 files changed, 951 insertions, 0 deletions
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
new file mode 100644
index 000000000..c9ba61413
--- /dev/null
+++ b/net/openvswitch/flow.c
@@ -0,0 +1,951 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ */
+
+#include <linux/uaccess.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <net/llc_pdu.h>
+#include <linux/kernel.h>
+#include <linux/jhash.h>
+#include <linux/jiffies.h>
+#include <linux/llc.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/udp.h>
+#include <linux/icmp.h>
+#include <linux/icmpv6.h>
+#include <linux/rculist.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/ipv6.h>
+#include <net/mpls.h>
+#include <net/ndisc.h>
+#include <net/nsh.h>
+
+#include "conntrack.h"
+#include "datapath.h"
+#include "flow.h"
+#include "flow_netlink.h"
+#include "vport.h"
+
+u64 ovs_flow_used_time(unsigned long flow_jiffies)
+{
+ struct timespec64 cur_ts;
+ u64 cur_ms, idle_ms;
+
+ ktime_get_ts64(&cur_ts);
+ idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
+ 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, __be16 tcp_flags,
+ const struct sk_buff *skb)
+{
+ struct sw_flow_stats *stats;
+ unsigned int cpu = smp_processor_id();
+ int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
+
+ stats = rcu_dereference(flow->stats[cpu]);
+
+ /* Check if already have CPU-specific stats. */
+ if (likely(stats)) {
+ spin_lock(&stats->lock);
+ /* Mark if we write on the pre-allocated stats. */
+ 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 CPU is the only writer on the
+ * pre-allocated stats keep using them.
+ */
+ if (unlikely(flow->stats_last_writer != cpu)) {
+ /* A previous locker may have already allocated the
+ * 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 != -1) &&
+ likely(!rcu_access_pointer(flow->stats[cpu]))) {
+ /* Try to allocate CPU-specific stats. */
+ struct sw_flow_stats *new_stats;
+
+ new_stats =
+ kmem_cache_alloc_node(flow_stats_cache,
+ GFP_NOWAIT |
+ __GFP_THISNODE |
+ __GFP_NOWARN |
+ __GFP_NOMEMALLOC,
+ numa_node_id());
+ if (likely(new_stats)) {
+ new_stats->used = jiffies;
+ new_stats->packet_count = 1;
+ new_stats->byte_count = len;
+ new_stats->tcp_flags = tcp_flags;
+ spin_lock_init(&new_stats->lock);
+
+ rcu_assign_pointer(flow->stats[cpu],
+ new_stats);
+ cpumask_set_cpu(cpu, &flow->cpu_used_mask);
+ goto unlock;
+ }
+ }
+ flow->stats_last_writer = cpu;
+ }
+ }
+
+ stats->used = jiffies;
+ stats->packet_count++;
+ stats->byte_count += len;
+ stats->tcp_flags |= tcp_flags;
+unlock:
+ spin_unlock(&stats->lock);
+}
+
+/* Must be called with rcu_read_lock or ovs_mutex. */
+void ovs_flow_stats_get(const struct sw_flow *flow,
+ struct ovs_flow_stats *ovs_stats,
+ unsigned long *used, __be16 *tcp_flags)
+{
+ int cpu;
+
+ *used = 0;
+ *tcp_flags = 0;
+ memset(ovs_stats, 0, sizeof(*ovs_stats));
+
+ /* 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 sw_flow_stats *stats = rcu_dereference_ovsl(flow->stats[cpu]);
+
+ if (stats) {
+ /* Local CPU may write on non-local stats, so we must
+ * block bottom-halves here.
+ */
+ spin_lock_bh(&stats->lock);
+ if (!*used || time_after(stats->used, *used))
+ *used = stats->used;
+ *tcp_flags |= stats->tcp_flags;
+ ovs_stats->n_packets += stats->packet_count;
+ ovs_stats->n_bytes += stats->byte_count;
+ spin_unlock_bh(&stats->lock);
+ }
+ }
+}
+
+/* Called with ovs_mutex. */
+void ovs_flow_stats_clear(struct sw_flow *flow)
+{
+ int cpu;
+
+ /* 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 sw_flow_stats *stats = ovsl_dereference(flow->stats[cpu]);
+
+ if (stats) {
+ spin_lock_bh(&stats->lock);
+ stats->used = 0;
+ stats->packet_count = 0;
+ stats->byte_count = 0;
+ stats->tcp_flags = 0;
+ spin_unlock_bh(&stats->lock);
+ }
+ }
+}
+
+static int check_header(struct sk_buff *skb, int len)
+{
+ if (unlikely(skb->len < len))
+ return -EINVAL;
+ if (unlikely(!pskb_may_pull(skb, len)))
+ return -ENOMEM;
+ return 0;
+}
+
+static bool arphdr_ok(struct sk_buff *skb)
+{
+ return pskb_may_pull(skb, skb_network_offset(skb) +
+ sizeof(struct arp_eth_header));
+}
+
+static int check_iphdr(struct sk_buff *skb)
+{
+ unsigned int nh_ofs = skb_network_offset(skb);
+ unsigned int ip_len;
+ int err;
+
+ err = check_header(skb, nh_ofs + sizeof(struct iphdr));
+ if (unlikely(err))
+ return err;
+
+ ip_len = ip_hdrlen(skb);
+ if (unlikely(ip_len < sizeof(struct iphdr) ||
+ skb->len < nh_ofs + ip_len))
+ return -EINVAL;
+
+ skb_set_transport_header(skb, nh_ofs + ip_len);
+ return 0;
+}
+
+static bool tcphdr_ok(struct sk_buff *skb)
+{
+ int th_ofs = skb_transport_offset(skb);
+ int tcp_len;
+
+ if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
+ return false;
+
+ tcp_len = tcp_hdrlen(skb);
+ if (unlikely(tcp_len < sizeof(struct tcphdr) ||
+ skb->len < th_ofs + tcp_len))
+ return false;
+
+ return true;
+}
+
+static bool udphdr_ok(struct sk_buff *skb)
+{
+ return pskb_may_pull(skb, skb_transport_offset(skb) +
+ sizeof(struct udphdr));
+}
+
+static bool sctphdr_ok(struct sk_buff *skb)
+{
+ return pskb_may_pull(skb, skb_transport_offset(skb) +
+ sizeof(struct sctphdr));
+}
+
+static bool icmphdr_ok(struct sk_buff *skb)
+{
+ return pskb_may_pull(skb, skb_transport_offset(skb) +
+ sizeof(struct icmphdr));
+}
+
+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;
+ struct ipv6hdr *nh;
+ int err, nexthdr, flags = 0;
+
+ err = check_header(skb, nh_ofs + sizeof(*nh));
+ if (unlikely(err))
+ return err;
+
+ nh = ipv6_hdr(skb);
+
+ key->ip.proto = NEXTHDR_NONE;
+ key->ip.tos = ipv6_get_dsfield(nh);
+ key->ip.ttl = nh->hop_limit;
+ key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
+ key->ipv6.addr.src = nh->saddr;
+ key->ipv6.addr.dst = nh->daddr;
+
+ 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;
+ key->ip.proto = NEXTHDR_FRAGMENT;
+ 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;
+ return nh_len;
+}
+
+static bool icmp6hdr_ok(struct sk_buff *skb)
+{
+ return pskb_may_pull(skb, skb_transport_offset(skb) +
+ sizeof(struct icmp6hdr));
+}
+
+/**
+ * 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 vlan_head *vh = (struct vlan_head *)skb->data;
+
+ if (likely(!eth_type_vlan(vh->tpid)))
+ return 0;
+
+ 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;
+
+ 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;
+
+ 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;
+}
+
+static __be16 parse_ethertype(struct sk_buff *skb)
+{
+ struct llc_snap_hdr {
+ u8 dsap; /* Always 0xAA */
+ u8 ssap; /* Always 0xAA */
+ u8 ctrl;
+ u8 oui[3];
+ __be16 ethertype;
+ };
+ struct llc_snap_hdr *llc;
+ __be16 proto;
+
+ proto = *(__be16 *) skb->data;
+ __skb_pull(skb, sizeof(__be16));
+
+ if (eth_proto_is_802_3(proto))
+ return proto;
+
+ if (skb->len < sizeof(struct llc_snap_hdr))
+ return htons(ETH_P_802_2);
+
+ if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
+ return htons(0);
+
+ llc = (struct llc_snap_hdr *) skb->data;
+ if (llc->dsap != LLC_SAP_SNAP ||
+ llc->ssap != LLC_SAP_SNAP ||
+ (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
+ return htons(ETH_P_802_2);
+
+ __skb_pull(skb, sizeof(struct llc_snap_hdr));
+
+ if (eth_proto_is_802_3(llc->ethertype))
+ return llc->ethertype;
+
+ return htons(ETH_P_802_2);
+}
+
+static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
+ int nh_len)
+{
+ struct icmp6hdr *icmp = icmp6_hdr(skb);
+
+ /* The ICMPv6 type and code fields use the 16-bit transport port
+ * fields, so we need to store them in 16-bit network byte order.
+ */
+ 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 ||
+ icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
+ int icmp_len = skb->len - skb_transport_offset(skb);
+ struct nd_msg *nd;
+ int offset;
+
+ /* In order to process neighbor discovery options, we need the
+ * entire packet.
+ */
+ if (unlikely(icmp_len < sizeof(*nd)))
+ return 0;
+
+ if (unlikely(skb_linearize(skb)))
+ return -ENOMEM;
+
+ nd = (struct nd_msg *)skb_transport_header(skb);
+ key->ipv6.nd.target = nd->target;
+
+ icmp_len -= sizeof(*nd);
+ offset = 0;
+ while (icmp_len >= 8) {
+ struct nd_opt_hdr *nd_opt =
+ (struct nd_opt_hdr *)(nd->opt + offset);
+ int opt_len = nd_opt->nd_opt_len * 8;
+
+ if (unlikely(!opt_len || opt_len > icmp_len))
+ return 0;
+
+ /* Store the link layer address if the appropriate
+ * option is provided. It is considered an error if
+ * the same link layer option is specified twice.
+ */
+ if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
+ && opt_len == 8) {
+ 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)]);
+ } 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)]);
+ }
+
+ icmp_len -= opt_len;
+ offset += opt_len;
+ }
+ }
+
+ return 0;
+
+invalid:
+ memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
+ memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
+ memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
+
+ return 0;
+}
+
+static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ struct nshhdr *nh;
+ unsigned int nh_ofs = skb_network_offset(skb);
+ u8 version, length;
+ int err;
+
+ err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN);
+ if (unlikely(err))
+ return err;
+
+ nh = nsh_hdr(skb);
+ version = nsh_get_ver(nh);
+ length = nsh_hdr_len(nh);
+
+ if (version != 0)
+ return -EINVAL;
+
+ err = check_header(skb, nh_ofs + length);
+ if (unlikely(err))
+ return err;
+
+ 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;
+ }
+
+ return 0;
+}
+
+/**
+ * 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)) {
+ struct iphdr *nh;
+ __be16 offset;
+
+ 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;
+ }
+ return error;
+ }
+
+ nh = ip_hdr(skb);
+ key->ipv4.addr.src = nh->saddr;
+ key->ipv4.addr.dst = nh->daddr;
+
+ key->ip.proto = nh->protocol;
+ key->ip.tos = nh->tos;
+ key->ip.ttl = nh->ttl;
+
+ 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;
+ }
+ if (nh->frag_off & htons(IP_MF) ||
+ skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+ key->ip.frag = OVS_FRAG_TYPE_FIRST;
+ else
+ key->ip.frag = OVS_FRAG_TYPE_NONE;
+
+ /* Transport layer. */
+ if (key->ip.proto == IPPROTO_TCP) {
+ if (tcphdr_ok(skb)) {
+ struct tcphdr *tcp = tcp_hdr(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 == 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. */
+ 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)) {
+ struct arp_eth_header *arp;
+ bool arp_available = arphdr_ok(skb);
+
+ arp = (struct arp_eth_header *)skb_network_header(skb);
+
+ 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)) {
+ u8 label_count = 1;
+
+ memset(&key->mpls, 0, sizeof(key->mpls));
+ skb_set_inner_network_header(skb, skb->mac_len);
+ while (1) {
+ __be32 lse;
+
+ error = check_header(skb, skb->mac_len +
+ label_count * MPLS_HLEN);
+ if (unlikely(error))
+ return 0;
+
+ memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN);
+
+ if (label_count <= MPLS_LABEL_DEPTH)
+ memcpy(&key->mpls.lse[label_count - 1], &lse,
+ MPLS_HLEN);
+
+ skb_set_inner_network_header(skb, skb->mac_len +
+ label_count * MPLS_HLEN);
+ if (lse & htonl(MPLS_LS_S_MASK))
+ break;
+
+ label_count++;
+ }
+ if (label_count > MPLS_LABEL_DEPTH)
+ label_count = MPLS_LABEL_DEPTH;
+
+ key->mpls.num_labels_mask = GENMASK(label_count - 1, 0);
+ } 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)) {
+ switch (nh_len) {
+ case -EINVAL:
+ memset(&key->ip, 0, sizeof(key->ip));
+ memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
+ fallthrough;
+ case -EPROTO:
+ skb->transport_header = skb->network_header;
+ error = 0;
+ break;
+ default:
+ error = nh_len;
+ }
+ return error;
+ }
+
+ if (key->ip.frag == OVS_FRAG_TYPE_LATER) {
+ memset(&key->tp, 0, sizeof(key->tp));
+ return 0;
+ }
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+ key->ip.frag = OVS_FRAG_TYPE_FIRST;
+
+ /* Transport layer. */
+ if (key->ip.proto == NEXTHDR_TCP) {
+ if (tcphdr_ok(skb)) {
+ struct tcphdr *tcp = tcp_hdr(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)
+{
+#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
+ struct tc_skb_ext *tc_ext;
+#endif
+ 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));
+
+ if (tun_info->options_len) {
+ BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
+ 8)) - 1
+ > sizeof(key->tun_opts));
+
+ 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;
+
+#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
+ if (static_branch_unlikely(&tc_recirc_sharing_support)) {
+ tc_ext = skb_ext_find(skb, TC_SKB_EXT);
+ key->recirc_id = tc_ext ? tc_ext->chain : 0;
+ OVS_CB(skb)->mru = tc_ext ? tc_ext->mru : 0;
+ } else {
+ key->recirc_id = 0;
+ }
+#else
+ key->recirc_id = 0;
+#endif
+
+ 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 22:03:37 +0000