/*
* Distributed under the terms of the GNU GPL version 2.
- * Copyright (c) 2007, 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2007, 2008, 2009, 2010, 2011 Nicira Networks.
*
* Significant portions of this file may be copied from parts of the Linux
* kernel, by Linus Torvalds and others.
#include "flow.h"
#include "datapath.h"
+#include <asm/uaccess.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <net/inet_ecn.h>
#include <net/ip.h>
-#include "compat.h"
-
-struct kmem_cache *flow_cache;
-static unsigned int hash_seed;
+static struct kmem_cache *flow_cache;
+static unsigned int hash_seed __read_mostly;
static inline bool arphdr_ok(struct sk_buff *skb)
{
spin_unlock_bh(&flow->lock);
}
-struct sw_flow_actions *flow_actions_alloc(size_t n_actions)
+struct sw_flow_actions *flow_actions_alloc(u32 actions_len)
{
struct sw_flow_actions *sfa;
- if (n_actions > (PAGE_SIZE - sizeof *sfa) / sizeof(union odp_action))
+ if (actions_len % NLA_ALIGNTO)
+ return ERR_PTR(-EINVAL);
+
+ /* At least DP_MAX_PORTS actions are required to be able to flood a
+ * packet to every port. Factor of 2 allows for setting VLAN tags,
+ * etc. */
+ if (actions_len > 2 * DP_MAX_PORTS * nla_total_size(4))
return ERR_PTR(-EINVAL);
- sfa = kmalloc(sizeof *sfa + n_actions * sizeof(union odp_action),
- GFP_KERNEL);
+ sfa = kmalloc(sizeof(*sfa) + actions_len, GFP_KERNEL);
if (!sfa)
return ERR_PTR(-ENOMEM);
- sfa->n_actions = n_actions;
+ sfa->actions_len = actions_len;
return sfa;
}
-
-/* Frees 'flow' immediately. */
-static void flow_free(struct sw_flow *flow)
+struct sw_flow *flow_alloc(void)
{
- if (unlikely(!flow))
- return;
- kfree(flow->sf_acts);
- kmem_cache_free(flow_cache, flow);
+ struct sw_flow *flow;
+
+ flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
+ if (!flow)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock_init(&flow->lock);
+ atomic_set(&flow->refcnt, 1);
+ flow->dead = false;
+
+ return flow;
}
void flow_free_tbl(struct tbl_node *node)
{
struct sw_flow *flow = flow_cast(node);
- flow_free(flow);
+
+ flow->dead = true;
+ flow_put(flow);
}
/* RCU callback used by flow_deferred_free. */
static void rcu_free_flow_callback(struct rcu_head *rcu)
{
struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
- flow_free(flow);
+
+ flow->dead = true;
+ flow_put(flow);
}
/* Schedules 'flow' to be freed after the next RCU grace period.
call_rcu(&flow->rcu, rcu_free_flow_callback);
}
+void flow_hold(struct sw_flow *flow)
+{
+ atomic_inc(&flow->refcnt);
+}
+
+void flow_put(struct sw_flow *flow)
+{
+ if (unlikely(!flow))
+ return;
+
+ if (atomic_dec_and_test(&flow->refcnt)) {
+ kfree((struct sf_flow_acts __force *)flow->sf_acts);
+ kmem_cache_free(flow_cache, flow);
+ }
+}
+
/* RCU callback used by flow_deferred_free_acts. */
static void rcu_free_acts_callback(struct rcu_head *rcu)
{
- struct sw_flow_actions *sf_acts = container_of(rcu,
+ struct sw_flow_actions *sf_acts = container_of(rcu,
struct sw_flow_actions, rcu);
kfree(sf_acts);
}
call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
}
-static void parse_vlan(struct sk_buff *skb, struct odp_flow_key *key)
+static void parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
{
struct qtag_prefix {
__be16 eth_type; /* ETH_P_8021Q */
return;
qp = (struct qtag_prefix *) skb->data;
- key->dl_vlan = qp->tci & htons(VLAN_VID_MASK);
- key->dl_vlan_pcp = (ntohs(qp->tci) & VLAN_PCP_MASK) >> VLAN_PCP_SHIFT;
+ key->dl_tci = qp->tci | htons(VLAN_TAG_PRESENT);
__skb_pull(skb, sizeof(struct qtag_prefix));
}
u8 ssap; /* Always 0xAA */
u8 ctrl;
u8 oui[3];
- u16 ethertype;
+ __be16 ethertype;
};
struct llc_snap_hdr *llc;
__be16 proto;
proto = *(__be16 *) skb->data;
__skb_pull(skb, sizeof(__be16));
- if (ntohs(proto) >= ODP_DL_TYPE_ETH2_CUTOFF)
+ if (ntohs(proto) >= 1536)
return proto;
if (unlikely(skb->len < sizeof(struct llc_snap_hdr)))
- return htons(ODP_DL_TYPE_NOT_ETH_TYPE);
+ return htons(ETH_P_802_2);
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(ODP_DL_TYPE_NOT_ETH_TYPE);
+ return htons(ETH_P_802_2);
__skb_pull(skb, sizeof(struct llc_snap_hdr));
return llc->ethertype;
* Ethernet header
* @in_port: port number on which @skb was received.
* @key: output flow key
+ * @is_frag: set to 1 if @skb contains an IPv4 fragment, or to 0 if @skb does
+ * not contain an IPv4 packet or if it is not a fragment.
*
* The caller must ensure that skb->len >= ETH_HLEN.
*
* Returns 0 if successful, otherwise a negative errno value.
*
- * Sets OVS_CB(skb)->is_frag to %true if @skb is an IPv4 fragment, otherwise to
- * %false.
+ * 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->dl_type is ETH_P_IP on output, then just
+ * past the IPv4 header, if one is present and of a correct length,
+ * otherwise the same as skb->network_header. For other key->dl_type
+ * values it is left untouched.
*/
-int flow_extract(struct sk_buff *skb, u16 in_port, struct odp_flow_key *key)
+int flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key,
+ bool *is_frag)
{
struct ethhdr *eth;
- memset(key, 0, sizeof *key);
+ memset(key, 0, sizeof(*key));
key->tun_id = OVS_CB(skb)->tun_id;
key->in_port = in_port;
- key->dl_vlan = htons(ODP_VLAN_NONE);
- OVS_CB(skb)->is_frag = false;
+ *is_frag = false;
/*
* We would really like to pull as many bytes as we could possibly
key->nw_proto = nh->protocol;
/* Transport layer. */
- if (!(nh->frag_off & htons(IP_MF | IP_OFFSET))) {
+ if (!(nh->frag_off & htons(IP_MF | IP_OFFSET)) &&
+ !(skb_shinfo(skb)->gso_type & SKB_GSO_UDP)) {
if (key->nw_proto == IPPROTO_TCP) {
if (tcphdr_ok(skb)) {
struct tcphdr *tcp = tcp_hdr(skb);
key->tp_src = tcp->source;
key->tp_dst = tcp->dest;
- } else {
- /* Avoid tricking other code into
- * thinking that this packet has an L4
- * header. */
- key->nw_proto = 0;
}
} else if (key->nw_proto == IPPROTO_UDP) {
if (udphdr_ok(skb)) {
struct udphdr *udp = udp_hdr(skb);
key->tp_src = udp->source;
key->tp_dst = udp->dest;
- } else {
- /* Avoid tricking other code into
- * thinking that this packet has an L4
- * header. */
- key->nw_proto = 0;
}
} else if (key->nw_proto == IPPROTO_ICMP) {
if (icmphdr_ok(skb)) {
* in 16-bit network byte order. */
key->tp_src = htons(icmp->type);
key->tp_dst = htons(icmp->code);
- } else {
- /* Avoid tricking other code into
- * thinking that this packet has an L4
- * header. */
- key->nw_proto = 0;
}
}
- } else {
- OVS_CB(skb)->is_frag = true;
- }
+ } else
+ *is_frag = true;
+
} else if (key->dl_type == htons(ETH_P_ARP) && arphdr_ok(skb)) {
struct arp_eth_header *arp;
&& arp->ar_pln == 4) {
/* We only match on the lower 8 bits of the opcode. */
- if (ntohs(arp->ar_op) <= 0xff) {
+ if (ntohs(arp->ar_op) <= 0xff)
key->nw_proto = ntohs(arp->ar_op);
- }
- if (key->nw_proto == ARPOP_REQUEST
+ if (key->nw_proto == ARPOP_REQUEST
|| key->nw_proto == ARPOP_REPLY) {
memcpy(&key->nw_src, arp->ar_sip, sizeof(key->nw_src));
memcpy(&key->nw_dst, arp->ar_tip, sizeof(key->nw_dst));
}
}
- } else {
- skb_reset_transport_header(skb);
}
return 0;
}
-u32 flow_hash(const struct odp_flow_key *key)
+u32 flow_hash(const struct sw_flow_key *key)
{
- return jhash2((u32*)key, sizeof *key / sizeof(u32), hash_seed);
+ return jhash2((u32*)key, sizeof(*key) / sizeof(u32), hash_seed);
}
int flow_cmp(const struct tbl_node *node, void *key2_)
{
- const struct odp_flow_key *key1 = &flow_cast(node)->key;
- const struct odp_flow_key *key2 = key2_;
+ const struct sw_flow_key *key1 = &flow_cast(node)->key;
+ const struct sw_flow_key *key2 = key2_;
+
+ return !memcmp(key1, key2, sizeof(struct sw_flow_key));
+}
+
+/**
+ * flow_from_nlattrs - parses Netlink attributes into a flow key.
+ * @swkey: receives the extracted flow key.
+ * @key: Netlink attribute holding nested %ODP_KEY_ATTR_* Netlink attribute
+ * sequence.
+ *
+ * This state machine accepts the following forms, with [] for optional
+ * elements and | for alternatives:
+ *
+ * [tun_id] in_port ethernet [8021q] [ethertype [IP [TCP|UDP|ICMP] | ARP]
+ */
+int flow_from_nlattrs(struct sw_flow_key *swkey, const struct nlattr *attr)
+{
+ const struct nlattr *nla;
+ u16 prev_type;
+ int rem;
+
+ memset(swkey, 0, sizeof(*swkey));
+ swkey->dl_type = htons(ETH_P_802_2);
+
+ prev_type = ODP_KEY_ATTR_UNSPEC;
+ nla_for_each_nested(nla, attr, rem) {
+ static const u32 key_lens[ODP_KEY_ATTR_MAX + 1] = {
+ [ODP_KEY_ATTR_TUN_ID] = 8,
+ [ODP_KEY_ATTR_IN_PORT] = 4,
+ [ODP_KEY_ATTR_ETHERNET] = sizeof(struct odp_key_ethernet),
+ [ODP_KEY_ATTR_8021Q] = sizeof(struct odp_key_8021q),
+ [ODP_KEY_ATTR_ETHERTYPE] = 2,
+ [ODP_KEY_ATTR_IPV4] = sizeof(struct odp_key_ipv4),
+ [ODP_KEY_ATTR_TCP] = sizeof(struct odp_key_tcp),
+ [ODP_KEY_ATTR_UDP] = sizeof(struct odp_key_udp),
+ [ODP_KEY_ATTR_ICMP] = sizeof(struct odp_key_icmp),
+ [ODP_KEY_ATTR_ARP] = sizeof(struct odp_key_arp),
+ };
+
+ const struct odp_key_ethernet *eth_key;
+ const struct odp_key_8021q *q_key;
+ const struct odp_key_ipv4 *ipv4_key;
+ const struct odp_key_tcp *tcp_key;
+ const struct odp_key_udp *udp_key;
+ const struct odp_key_icmp *icmp_key;
+ const struct odp_key_arp *arp_key;
+
+ int type = nla_type(nla);
+
+ if (type > ODP_KEY_ATTR_MAX || nla_len(nla) != key_lens[type])
+ return -EINVAL;
+
+#define TRANSITION(PREV_TYPE, TYPE) (((PREV_TYPE) << 16) | (TYPE))
+ switch (TRANSITION(prev_type, type)) {
+ case TRANSITION(ODP_KEY_ATTR_UNSPEC, ODP_KEY_ATTR_TUN_ID):
+ swkey->tun_id = nla_get_be64(nla);
+ break;
+
+ case TRANSITION(ODP_KEY_ATTR_UNSPEC, ODP_KEY_ATTR_IN_PORT):
+ case TRANSITION(ODP_KEY_ATTR_TUN_ID, ODP_KEY_ATTR_IN_PORT):
+ if (nla_get_u32(nla) >= DP_MAX_PORTS)
+ return -EINVAL;
+ swkey->in_port = nla_get_u32(nla);
+ break;
+
+ case TRANSITION(ODP_KEY_ATTR_IN_PORT, ODP_KEY_ATTR_ETHERNET):
+ eth_key = nla_data(nla);
+ memcpy(swkey->dl_src, eth_key->eth_src, ETH_ALEN);
+ memcpy(swkey->dl_dst, eth_key->eth_dst, ETH_ALEN);
+ break;
+
+ case TRANSITION(ODP_KEY_ATTR_ETHERNET, ODP_KEY_ATTR_8021Q):
+ q_key = nla_data(nla);
+ /* Only standard 0x8100 VLANs currently supported. */
+ if (q_key->q_tpid != htons(ETH_P_8021Q))
+ return -EINVAL;
+ if (q_key->q_tci & htons(VLAN_TAG_PRESENT))
+ return -EINVAL;
+ swkey->dl_tci = q_key->q_tci | htons(VLAN_TAG_PRESENT);
+ break;
+
+ case TRANSITION(ODP_KEY_ATTR_8021Q, ODP_KEY_ATTR_ETHERTYPE):
+ case TRANSITION(ODP_KEY_ATTR_ETHERNET, ODP_KEY_ATTR_ETHERTYPE):
+ swkey->dl_type = nla_get_be16(nla);
+ if (ntohs(swkey->dl_type) < 1536)
+ return -EINVAL;
+ break;
+
+ case TRANSITION(ODP_KEY_ATTR_ETHERTYPE, ODP_KEY_ATTR_IPV4):
+ if (swkey->dl_type != htons(ETH_P_IP))
+ return -EINVAL;
+ ipv4_key = nla_data(nla);
+ swkey->nw_src = ipv4_key->ipv4_src;
+ swkey->nw_dst = ipv4_key->ipv4_dst;
+ swkey->nw_proto = ipv4_key->ipv4_proto;
+ swkey->nw_tos = ipv4_key->ipv4_tos;
+ if (swkey->nw_tos & INET_ECN_MASK)
+ return -EINVAL;
+ break;
+
+ case TRANSITION(ODP_KEY_ATTR_IPV4, ODP_KEY_ATTR_TCP):
+ if (swkey->nw_proto != IPPROTO_TCP)
+ return -EINVAL;
+ tcp_key = nla_data(nla);
+ swkey->tp_src = tcp_key->tcp_src;
+ swkey->tp_dst = tcp_key->tcp_dst;
+ break;
+
+ case TRANSITION(ODP_KEY_ATTR_IPV4, ODP_KEY_ATTR_UDP):
+ if (swkey->nw_proto != IPPROTO_UDP)
+ return -EINVAL;
+ udp_key = nla_data(nla);
+ swkey->tp_src = udp_key->udp_src;
+ swkey->tp_dst = udp_key->udp_dst;
+ break;
+
+ case TRANSITION(ODP_KEY_ATTR_IPV4, ODP_KEY_ATTR_ICMP):
+ if (swkey->nw_proto != IPPROTO_ICMP)
+ return -EINVAL;
+ icmp_key = nla_data(nla);
+ swkey->tp_src = htons(icmp_key->icmp_type);
+ swkey->tp_dst = htons(icmp_key->icmp_code);
+ break;
+
+ case TRANSITION(ODP_KEY_ATTR_ETHERTYPE, ODP_KEY_ATTR_ARP):
+ if (swkey->dl_type != htons(ETH_P_ARP))
+ return -EINVAL;
+ arp_key = nla_data(nla);
+ swkey->nw_src = arp_key->arp_sip;
+ swkey->nw_dst = arp_key->arp_tip;
+ if (arp_key->arp_op & htons(0xff00))
+ return -EINVAL;
+ swkey->nw_proto = ntohs(arp_key->arp_op);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ prev_type = type;
+ }
+ if (rem)
+ return -EINVAL;
+
+ switch (prev_type) {
+ case ODP_KEY_ATTR_UNSPEC:
+ return -EINVAL;
+
+ case ODP_KEY_ATTR_TUN_ID:
+ case ODP_KEY_ATTR_IN_PORT:
+ return -EINVAL;
+
+ case ODP_KEY_ATTR_ETHERNET:
+ case ODP_KEY_ATTR_8021Q:
+ return 0;
+
+ case ODP_KEY_ATTR_ETHERTYPE:
+ if (swkey->dl_type == htons(ETH_P_IP) ||
+ swkey->dl_type == htons(ETH_P_ARP))
+ return -EINVAL;
+ return 0;
+
+ case ODP_KEY_ATTR_IPV4:
+ if (swkey->nw_proto == IPPROTO_TCP ||
+ swkey->nw_proto == IPPROTO_UDP ||
+ swkey->nw_proto == IPPROTO_ICMP)
+ return -EINVAL;
+ return 0;
+
+ case ODP_KEY_ATTR_TCP:
+ case ODP_KEY_ATTR_UDP:
+ case ODP_KEY_ATTR_ICMP:
+ case ODP_KEY_ATTR_ARP:
+ return 0;
+ }
+
+ WARN_ON_ONCE(1);
+ return -EINVAL;
+}
+
+int flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb)
+{
+ struct odp_key_ethernet *eth_key;
+ struct nlattr *nla;
+
+ if (swkey->tun_id != cpu_to_be64(0))
+ NLA_PUT_BE64(skb, ODP_KEY_ATTR_TUN_ID, swkey->tun_id);
+
+ NLA_PUT_U32(skb, ODP_KEY_ATTR_IN_PORT, swkey->in_port);
+
+ nla = nla_reserve(skb, ODP_KEY_ATTR_ETHERNET, sizeof(*eth_key));
+ if (!nla)
+ goto nla_put_failure;
+ eth_key = nla_data(nla);
+ memcpy(eth_key->eth_src, swkey->dl_src, ETH_ALEN);
+ memcpy(eth_key->eth_dst, swkey->dl_dst, ETH_ALEN);
+
+ if (swkey->dl_tci != htons(0)) {
+ struct odp_key_8021q q_key;
+
+ q_key.q_tpid = htons(ETH_P_8021Q);
+ q_key.q_tci = swkey->dl_tci & ~htons(VLAN_TAG_PRESENT);
+ NLA_PUT(skb, ODP_KEY_ATTR_8021Q, sizeof(q_key), &q_key);
+ }
+
+ if (swkey->dl_type == htons(ETH_P_802_2))
+ return 0;
+
+ NLA_PUT_BE16(skb, ODP_KEY_ATTR_ETHERTYPE, swkey->dl_type);
+
+ if (swkey->dl_type == htons(ETH_P_IP)) {
+ struct odp_key_ipv4 *ipv4_key;
+
+ nla = nla_reserve(skb, ODP_KEY_ATTR_IPV4, sizeof(*ipv4_key));
+ if (!nla)
+ goto nla_put_failure;
+ ipv4_key = nla_data(nla);
+ ipv4_key->ipv4_src = swkey->nw_src;
+ ipv4_key->ipv4_dst = swkey->nw_dst;
+ ipv4_key->ipv4_proto = swkey->nw_proto;
+ ipv4_key->ipv4_tos = swkey->nw_tos;
+
+ if (swkey->nw_proto == IPPROTO_TCP) {
+ struct odp_key_tcp *tcp_key;
+
+ nla = nla_reserve(skb, ODP_KEY_ATTR_TCP, sizeof(*tcp_key));
+ if (!nla)
+ goto nla_put_failure;
+ tcp_key = nla_data(nla);
+ tcp_key->tcp_src = swkey->tp_src;
+ tcp_key->tcp_dst = swkey->tp_dst;
+ } else if (swkey->nw_proto == IPPROTO_UDP) {
+ struct odp_key_udp *udp_key;
+
+ nla = nla_reserve(skb, ODP_KEY_ATTR_UDP, sizeof(*udp_key));
+ if (!nla)
+ goto nla_put_failure;
+ udp_key = nla_data(nla);
+ udp_key->udp_src = swkey->tp_src;
+ udp_key->udp_dst = swkey->tp_dst;
+ } else if (swkey->nw_proto == IPPROTO_ICMP) {
+ struct odp_key_icmp *icmp_key;
+
+ nla = nla_reserve(skb, ODP_KEY_ATTR_ICMP, sizeof(*icmp_key));
+ if (!nla)
+ goto nla_put_failure;
+ icmp_key = nla_data(nla);
+ icmp_key->icmp_type = ntohs(swkey->tp_src);
+ icmp_key->icmp_code = ntohs(swkey->tp_dst);
+ }
+ } else if (swkey->dl_type == htons(ETH_P_ARP)) {
+ struct odp_key_arp *arp_key;
+
+ nla = nla_reserve(skb, ODP_KEY_ATTR_ARP, sizeof(*arp_key));
+ if (!nla)
+ goto nla_put_failure;
+ arp_key = nla_data(nla);
+ arp_key->arp_sip = swkey->nw_src;
+ arp_key->arp_tip = swkey->nw_dst;
+ arp_key->arp_op = htons(swkey->nw_proto);
+ }
+
+ return 0;
- return !memcmp(key1, key2, sizeof(struct odp_flow_key));
+nla_put_failure:
+ return -EMSGSIZE;
}
/* Initializes the flow module.
if (flow_cache == NULL)
return -ENOMEM;
- get_random_bytes(&hash_seed, sizeof hash_seed);
+ get_random_bytes(&hash_seed, sizeof(hash_seed));
return 0;
}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff