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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Joe Stringer](/assets/img/avatar_default.png)
This patch adds support for rewriting SCTP src,dst ports similar to the functionality already available for TCP/UDP. Rewriting SCTP ports is expensive due to double-recalculation of the SCTP checksums; this is performed to ensure that packets traversing OVS with invalid checksums will continue to the destination with any checksum corruption intact. Reviewed-by: Simon Horman <horms@verge.net.au> Signed-off-by: Joe Stringer <joe@wand.net.nz> Signed-off-by: Ben Pfaff <blp@nicira.com> Signed-off-by: Jesse Gross <jesse@nicira.com>
2056 lines
54 KiB
C
2056 lines
54 KiB
C
/*
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* Copyright (c) 2007-2013 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#include "flow.h"
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#include "datapath.h"
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#include <linux/uaccess.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <net/llc_pdu.h>
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#include <linux/kernel.h>
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#include <linux/jhash.h>
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#include <linux/jiffies.h>
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#include <linux/llc.h>
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#include <linux/module.h>
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#include <linux/in.h>
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#include <linux/rcupdate.h>
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#include <linux/if_arp.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/sctp.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/icmp.h>
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#include <linux/icmpv6.h>
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#include <linux/rculist.h>
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#include <net/ip.h>
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#include <net/ip_tunnels.h>
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#include <net/ipv6.h>
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#include <net/ndisc.h>
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static struct kmem_cache *flow_cache;
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static void ovs_sw_flow_mask_set(struct sw_flow_mask *mask,
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struct sw_flow_key_range *range, u8 val);
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static void update_range__(struct sw_flow_match *match,
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size_t offset, size_t size, bool is_mask)
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{
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struct sw_flow_key_range *range = NULL;
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size_t start = offset;
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size_t end = offset + size;
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if (!is_mask)
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range = &match->range;
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else if (match->mask)
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range = &match->mask->range;
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if (!range)
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return;
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if (range->start == range->end) {
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range->start = start;
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range->end = end;
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return;
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}
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if (range->start > start)
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range->start = start;
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if (range->end < end)
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range->end = end;
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}
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#define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
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do { \
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update_range__(match, offsetof(struct sw_flow_key, field), \
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sizeof((match)->key->field), is_mask); \
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if (is_mask) { \
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if ((match)->mask) \
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(match)->mask->key.field = value; \
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} else { \
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(match)->key->field = value; \
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} \
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} while (0)
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#define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \
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do { \
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update_range__(match, offsetof(struct sw_flow_key, field), \
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len, is_mask); \
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if (is_mask) { \
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if ((match)->mask) \
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memcpy(&(match)->mask->key.field, value_p, len);\
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} else { \
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memcpy(&(match)->key->field, value_p, len); \
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} \
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} while (0)
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void ovs_match_init(struct sw_flow_match *match,
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struct sw_flow_key *key,
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struct sw_flow_mask *mask)
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{
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memset(match, 0, sizeof(*match));
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match->key = key;
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match->mask = mask;
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memset(key, 0, sizeof(*key));
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if (mask) {
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memset(&mask->key, 0, sizeof(mask->key));
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mask->range.start = mask->range.end = 0;
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}
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}
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static bool ovs_match_validate(const struct sw_flow_match *match,
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u64 key_attrs, u64 mask_attrs)
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{
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u64 key_expected = 1 << OVS_KEY_ATTR_ETHERNET;
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u64 mask_allowed = key_attrs; /* At most allow all key attributes */
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/* The following mask attributes allowed only if they
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* pass the validation tests. */
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mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
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| (1 << OVS_KEY_ATTR_IPV6)
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| (1 << OVS_KEY_ATTR_TCP)
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| (1 << OVS_KEY_ATTR_UDP)
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| (1 << OVS_KEY_ATTR_SCTP)
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| (1 << OVS_KEY_ATTR_ICMP)
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| (1 << OVS_KEY_ATTR_ICMPV6)
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| (1 << OVS_KEY_ATTR_ARP)
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| (1 << OVS_KEY_ATTR_ND));
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/* Always allowed mask fields. */
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mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL)
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| (1 << OVS_KEY_ATTR_IN_PORT)
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| (1 << OVS_KEY_ATTR_ETHERTYPE));
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/* Check key attributes. */
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if (match->key->eth.type == htons(ETH_P_ARP)
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|| match->key->eth.type == htons(ETH_P_RARP)) {
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key_expected |= 1 << OVS_KEY_ATTR_ARP;
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if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
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mask_allowed |= 1 << OVS_KEY_ATTR_ARP;
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}
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if (match->key->eth.type == htons(ETH_P_IP)) {
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key_expected |= 1 << OVS_KEY_ATTR_IPV4;
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if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
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mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
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if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
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if (match->key->ip.proto == IPPROTO_UDP) {
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key_expected |= 1 << OVS_KEY_ATTR_UDP;
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if (match->mask && (match->mask->key.ip.proto == 0xff))
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mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
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}
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if (match->key->ip.proto == IPPROTO_SCTP) {
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key_expected |= 1 << OVS_KEY_ATTR_SCTP;
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if (match->mask && (match->mask->key.ip.proto == 0xff))
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mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
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}
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if (match->key->ip.proto == IPPROTO_TCP) {
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key_expected |= 1 << OVS_KEY_ATTR_TCP;
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if (match->mask && (match->mask->key.ip.proto == 0xff))
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mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
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}
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if (match->key->ip.proto == IPPROTO_ICMP) {
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key_expected |= 1 << OVS_KEY_ATTR_ICMP;
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if (match->mask && (match->mask->key.ip.proto == 0xff))
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mask_allowed |= 1 << OVS_KEY_ATTR_ICMP;
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}
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}
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}
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if (match->key->eth.type == htons(ETH_P_IPV6)) {
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key_expected |= 1 << OVS_KEY_ATTR_IPV6;
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if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
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mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
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if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
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if (match->key->ip.proto == IPPROTO_UDP) {
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key_expected |= 1 << OVS_KEY_ATTR_UDP;
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if (match->mask && (match->mask->key.ip.proto == 0xff))
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mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
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}
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if (match->key->ip.proto == IPPROTO_SCTP) {
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key_expected |= 1 << OVS_KEY_ATTR_SCTP;
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if (match->mask && (match->mask->key.ip.proto == 0xff))
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mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
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}
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if (match->key->ip.proto == IPPROTO_TCP) {
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key_expected |= 1 << OVS_KEY_ATTR_TCP;
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if (match->mask && (match->mask->key.ip.proto == 0xff))
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mask_allowed |= 1 << OVS_KEY_ATTR_TCP;
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}
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if (match->key->ip.proto == IPPROTO_ICMPV6) {
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key_expected |= 1 << OVS_KEY_ATTR_ICMPV6;
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if (match->mask && (match->mask->key.ip.proto == 0xff))
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mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6;
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if (match->key->ipv6.tp.src ==
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htons(NDISC_NEIGHBOUR_SOLICITATION) ||
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match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
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key_expected |= 1 << OVS_KEY_ATTR_ND;
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if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff)))
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mask_allowed |= 1 << OVS_KEY_ATTR_ND;
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}
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}
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}
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}
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if ((key_attrs & key_expected) != key_expected) {
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/* Key attributes check failed. */
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OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n",
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key_attrs, key_expected);
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return false;
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}
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if ((mask_attrs & mask_allowed) != mask_attrs) {
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/* Mask attributes check failed. */
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OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n",
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mask_attrs, mask_allowed);
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return false;
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}
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return true;
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}
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static int check_header(struct sk_buff *skb, int len)
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{
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if (unlikely(skb->len < len))
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return -EINVAL;
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if (unlikely(!pskb_may_pull(skb, len)))
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return -ENOMEM;
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return 0;
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}
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static bool arphdr_ok(struct sk_buff *skb)
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{
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return pskb_may_pull(skb, skb_network_offset(skb) +
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sizeof(struct arp_eth_header));
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}
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static int check_iphdr(struct sk_buff *skb)
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{
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unsigned int nh_ofs = skb_network_offset(skb);
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unsigned int ip_len;
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int err;
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err = check_header(skb, nh_ofs + sizeof(struct iphdr));
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if (unlikely(err))
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return err;
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ip_len = ip_hdrlen(skb);
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if (unlikely(ip_len < sizeof(struct iphdr) ||
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skb->len < nh_ofs + ip_len))
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return -EINVAL;
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skb_set_transport_header(skb, nh_ofs + ip_len);
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return 0;
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}
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static bool tcphdr_ok(struct sk_buff *skb)
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{
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int th_ofs = skb_transport_offset(skb);
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int tcp_len;
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if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
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return false;
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tcp_len = tcp_hdrlen(skb);
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if (unlikely(tcp_len < sizeof(struct tcphdr) ||
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skb->len < th_ofs + tcp_len))
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return false;
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return true;
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}
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static bool udphdr_ok(struct sk_buff *skb)
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{
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return pskb_may_pull(skb, skb_transport_offset(skb) +
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sizeof(struct udphdr));
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}
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static bool sctphdr_ok(struct sk_buff *skb)
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{
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return pskb_may_pull(skb, skb_transport_offset(skb) +
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sizeof(struct sctphdr));
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}
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static bool icmphdr_ok(struct sk_buff *skb)
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{
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return pskb_may_pull(skb, skb_transport_offset(skb) +
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sizeof(struct icmphdr));
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}
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u64 ovs_flow_used_time(unsigned long flow_jiffies)
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{
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struct timespec cur_ts;
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u64 cur_ms, idle_ms;
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ktime_get_ts(&cur_ts);
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idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
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cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
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cur_ts.tv_nsec / NSEC_PER_MSEC;
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return cur_ms - idle_ms;
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}
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static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
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{
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unsigned int nh_ofs = skb_network_offset(skb);
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unsigned int nh_len;
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int payload_ofs;
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struct ipv6hdr *nh;
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uint8_t nexthdr;
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__be16 frag_off;
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int err;
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err = check_header(skb, nh_ofs + sizeof(*nh));
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if (unlikely(err))
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return err;
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nh = ipv6_hdr(skb);
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nexthdr = nh->nexthdr;
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payload_ofs = (u8 *)(nh + 1) - skb->data;
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key->ip.proto = NEXTHDR_NONE;
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key->ip.tos = ipv6_get_dsfield(nh);
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key->ip.ttl = nh->hop_limit;
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key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
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key->ipv6.addr.src = nh->saddr;
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key->ipv6.addr.dst = nh->daddr;
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payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
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if (unlikely(payload_ofs < 0))
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return -EINVAL;
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if (frag_off) {
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if (frag_off & htons(~0x7))
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key->ip.frag = OVS_FRAG_TYPE_LATER;
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else
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key->ip.frag = OVS_FRAG_TYPE_FIRST;
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}
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nh_len = payload_ofs - nh_ofs;
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skb_set_transport_header(skb, nh_ofs + nh_len);
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key->ip.proto = nexthdr;
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return nh_len;
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}
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static bool icmp6hdr_ok(struct sk_buff *skb)
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{
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return pskb_may_pull(skb, skb_transport_offset(skb) +
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sizeof(struct icmp6hdr));
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}
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void ovs_flow_key_mask(struct sw_flow_key *dst, const struct sw_flow_key *src,
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const struct sw_flow_mask *mask)
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{
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u8 *m = (u8 *)&mask->key + mask->range.start;
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u8 *s = (u8 *)src + mask->range.start;
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u8 *d = (u8 *)dst + mask->range.start;
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int i;
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memset(dst, 0, sizeof(*dst));
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for (i = 0; i < ovs_sw_flow_mask_size_roundup(mask); i++) {
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*d = *s & *m;
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d++, s++, m++;
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}
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}
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#define TCP_FLAGS_OFFSET 13
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#define TCP_FLAG_MASK 0x3f
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void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
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{
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u8 tcp_flags = 0;
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if ((flow->key.eth.type == htons(ETH_P_IP) ||
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flow->key.eth.type == htons(ETH_P_IPV6)) &&
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flow->key.ip.proto == IPPROTO_TCP &&
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likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
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u8 *tcp = (u8 *)tcp_hdr(skb);
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tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK;
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}
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spin_lock(&flow->lock);
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flow->used = jiffies;
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flow->packet_count++;
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flow->byte_count += skb->len;
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flow->tcp_flags |= tcp_flags;
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spin_unlock(&flow->lock);
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}
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struct sw_flow_actions *ovs_flow_actions_alloc(int size)
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{
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struct sw_flow_actions *sfa;
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if (size > MAX_ACTIONS_BUFSIZE)
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return ERR_PTR(-EINVAL);
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sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
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if (!sfa)
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return ERR_PTR(-ENOMEM);
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sfa->actions_len = 0;
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return sfa;
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}
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struct sw_flow *ovs_flow_alloc(void)
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{
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struct sw_flow *flow;
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flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
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if (!flow)
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return ERR_PTR(-ENOMEM);
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spin_lock_init(&flow->lock);
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flow->sf_acts = NULL;
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flow->mask = NULL;
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return flow;
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}
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|
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static struct hlist_head *find_bucket(struct flow_table *table, u32 hash)
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{
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hash = jhash_1word(hash, table->hash_seed);
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return flex_array_get(table->buckets,
|
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(hash & (table->n_buckets - 1)));
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}
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|
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static struct flex_array *alloc_buckets(unsigned int n_buckets)
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|
{
|
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struct flex_array *buckets;
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int i, err;
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buckets = flex_array_alloc(sizeof(struct hlist_head),
|
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n_buckets, GFP_KERNEL);
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if (!buckets)
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return NULL;
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err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL);
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if (err) {
|
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flex_array_free(buckets);
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return NULL;
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}
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for (i = 0; i < n_buckets; i++)
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INIT_HLIST_HEAD((struct hlist_head *)
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flex_array_get(buckets, i));
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return buckets;
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}
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|
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static void free_buckets(struct flex_array *buckets)
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{
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flex_array_free(buckets);
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}
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|
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static struct flow_table *__flow_tbl_alloc(int new_size)
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{
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struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL);
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|
if (!table)
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return NULL;
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|
table->buckets = alloc_buckets(new_size);
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|
|
if (!table->buckets) {
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|
kfree(table);
|
|
return NULL;
|
|
}
|
|
table->n_buckets = new_size;
|
|
table->count = 0;
|
|
table->node_ver = 0;
|
|
table->keep_flows = false;
|
|
get_random_bytes(&table->hash_seed, sizeof(u32));
|
|
table->mask_list = NULL;
|
|
|
|
return table;
|
|
}
|
|
|
|
static void __flow_tbl_destroy(struct flow_table *table)
|
|
{
|
|
int i;
|
|
|
|
if (table->keep_flows)
|
|
goto skip_flows;
|
|
|
|
for (i = 0; i < table->n_buckets; i++) {
|
|
struct sw_flow *flow;
|
|
struct hlist_head *head = flex_array_get(table->buckets, i);
|
|
struct hlist_node *n;
|
|
int ver = table->node_ver;
|
|
|
|
hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) {
|
|
hlist_del(&flow->hash_node[ver]);
|
|
ovs_flow_free(flow, false);
|
|
}
|
|
}
|
|
|
|
BUG_ON(!list_empty(table->mask_list));
|
|
kfree(table->mask_list);
|
|
|
|
skip_flows:
|
|
free_buckets(table->buckets);
|
|
kfree(table);
|
|
}
|
|
|
|
struct flow_table *ovs_flow_tbl_alloc(int new_size)
|
|
{
|
|
struct flow_table *table = __flow_tbl_alloc(new_size);
|
|
|
|
if (!table)
|
|
return NULL;
|
|
|
|
table->mask_list = kmalloc(sizeof(struct list_head), GFP_KERNEL);
|
|
if (!table->mask_list) {
|
|
table->keep_flows = true;
|
|
__flow_tbl_destroy(table);
|
|
return NULL;
|
|
}
|
|
INIT_LIST_HEAD(table->mask_list);
|
|
|
|
return table;
|
|
}
|
|
|
|
static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
|
|
{
|
|
struct flow_table *table = container_of(rcu, struct flow_table, rcu);
|
|
|
|
__flow_tbl_destroy(table);
|
|
}
|
|
|
|
void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred)
|
|
{
|
|
if (!table)
|
|
return;
|
|
|
|
if (deferred)
|
|
call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb);
|
|
else
|
|
__flow_tbl_destroy(table);
|
|
}
|
|
|
|
struct sw_flow *ovs_flow_dump_next(struct flow_table *table, u32 *bucket, u32 *last)
|
|
{
|
|
struct sw_flow *flow;
|
|
struct hlist_head *head;
|
|
int ver;
|
|
int i;
|
|
|
|
ver = table->node_ver;
|
|
while (*bucket < table->n_buckets) {
|
|
i = 0;
|
|
head = flex_array_get(table->buckets, *bucket);
|
|
hlist_for_each_entry_rcu(flow, head, hash_node[ver]) {
|
|
if (i < *last) {
|
|
i++;
|
|
continue;
|
|
}
|
|
*last = i + 1;
|
|
return flow;
|
|
}
|
|
(*bucket)++;
|
|
*last = 0;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void __tbl_insert(struct flow_table *table, struct sw_flow *flow)
|
|
{
|
|
struct hlist_head *head;
|
|
|
|
head = find_bucket(table, flow->hash);
|
|
hlist_add_head_rcu(&flow->hash_node[table->node_ver], head);
|
|
|
|
table->count++;
|
|
}
|
|
|
|
static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new)
|
|
{
|
|
int old_ver;
|
|
int i;
|
|
|
|
old_ver = old->node_ver;
|
|
new->node_ver = !old_ver;
|
|
|
|
/* Insert in new table. */
|
|
for (i = 0; i < old->n_buckets; i++) {
|
|
struct sw_flow *flow;
|
|
struct hlist_head *head;
|
|
|
|
head = flex_array_get(old->buckets, i);
|
|
|
|
hlist_for_each_entry(flow, head, hash_node[old_ver])
|
|
__tbl_insert(new, flow);
|
|
}
|
|
|
|
new->mask_list = old->mask_list;
|
|
old->keep_flows = true;
|
|
}
|
|
|
|
static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets)
|
|
{
|
|
struct flow_table *new_table;
|
|
|
|
new_table = __flow_tbl_alloc(n_buckets);
|
|
if (!new_table)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
flow_table_copy_flows(table, new_table);
|
|
|
|
return new_table;
|
|
}
|
|
|
|
struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table)
|
|
{
|
|
return __flow_tbl_rehash(table, table->n_buckets);
|
|
}
|
|
|
|
struct flow_table *ovs_flow_tbl_expand(struct flow_table *table)
|
|
{
|
|
return __flow_tbl_rehash(table, table->n_buckets * 2);
|
|
}
|
|
|
|
static void __flow_free(struct sw_flow *flow)
|
|
{
|
|
kfree((struct sf_flow_acts __force *)flow->sf_acts);
|
|
kmem_cache_free(flow_cache, flow);
|
|
}
|
|
|
|
static void rcu_free_flow_callback(struct rcu_head *rcu)
|
|
{
|
|
struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
|
|
|
|
__flow_free(flow);
|
|
}
|
|
|
|
void ovs_flow_free(struct sw_flow *flow, bool deferred)
|
|
{
|
|
if (!flow)
|
|
return;
|
|
|
|
ovs_sw_flow_mask_del_ref(flow->mask, deferred);
|
|
|
|
if (deferred)
|
|
call_rcu(&flow->rcu, rcu_free_flow_callback);
|
|
else
|
|
__flow_free(flow);
|
|
}
|
|
|
|
/* Schedules 'sf_acts' to be freed after the next RCU grace period.
|
|
* The caller must hold rcu_read_lock for this to be sensible. */
|
|
void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts)
|
|
{
|
|
kfree_rcu(sf_acts, rcu);
|
|
}
|
|
|
|
static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
|
|
{
|
|
struct qtag_prefix {
|
|
__be16 eth_type; /* ETH_P_8021Q */
|
|
__be16 tci;
|
|
};
|
|
struct qtag_prefix *qp;
|
|
|
|
if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
|
|
return 0;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
|
|
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));
|
|
|
|
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 (ntohs(proto) >= ETH_P_802_3_MIN)
|
|
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 (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
|
|
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->ipv6.tp.src = htons(icmp->icmp6_type);
|
|
key->ipv6.tp.dst = htons(icmp->icmp6_code);
|
|
|
|
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;
|
|
memcpy(key->ipv6.nd.sll,
|
|
&nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
|
|
} 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;
|
|
memcpy(key->ipv6.nd.tll,
|
|
&nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int error;
|
|
struct ethhdr *eth;
|
|
|
|
memset(key, 0, sizeof(*key));
|
|
|
|
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;
|
|
|
|
skb_reset_mac_header(skb);
|
|
|
|
/* Link layer. We are guaranteed to have at least the 14 byte Ethernet
|
|
* header in the linear data area.
|
|
*/
|
|
eth = eth_hdr(skb);
|
|
memcpy(key->eth.src, eth->h_source, ETH_ALEN);
|
|
memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
|
|
|
|
__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 (vlan_tx_tag_present(skb))
|
|
key->eth.tci = htons(skb->vlan_tci);
|
|
else if (eth->h_proto == htons(ETH_P_8021Q))
|
|
if (unlikely(parse_vlan(skb, key)))
|
|
return -ENOMEM;
|
|
|
|
key->eth.type = parse_ethertype(skb);
|
|
if (unlikely(key->eth.type == htons(0)))
|
|
return -ENOMEM;
|
|
|
|
skb_reset_network_header(skb);
|
|
__skb_push(skb, skb->data - skb_mac_header(skb));
|
|
|
|
/* Network layer. */
|
|
if (key->eth.type == htons(ETH_P_IP)) {
|
|
struct iphdr *nh;
|
|
__be16 offset;
|
|
|
|
error = check_iphdr(skb);
|
|
if (unlikely(error)) {
|
|
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;
|
|
return 0;
|
|
}
|
|
if (nh->frag_off & htons(IP_MF) ||
|
|
skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
|
|
key->ip.frag = OVS_FRAG_TYPE_FIRST;
|
|
|
|
/* Transport layer. */
|
|
if (key->ip.proto == IPPROTO_TCP) {
|
|
if (tcphdr_ok(skb)) {
|
|
struct tcphdr *tcp = tcp_hdr(skb);
|
|
key->ipv4.tp.src = tcp->source;
|
|
key->ipv4.tp.dst = tcp->dest;
|
|
}
|
|
} else if (key->ip.proto == IPPROTO_UDP) {
|
|
if (udphdr_ok(skb)) {
|
|
struct udphdr *udp = udp_hdr(skb);
|
|
key->ipv4.tp.src = udp->source;
|
|
key->ipv4.tp.dst = udp->dest;
|
|
}
|
|
} else if (key->ip.proto == IPPROTO_SCTP) {
|
|
if (sctphdr_ok(skb)) {
|
|
struct sctphdr *sctp = sctp_hdr(skb);
|
|
key->ipv4.tp.src = sctp->source;
|
|
key->ipv4.tp.dst = sctp->dest;
|
|
}
|
|
} 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->ipv4.tp.src = htons(icmp->type);
|
|
key->ipv4.tp.dst = htons(icmp->code);
|
|
}
|
|
}
|
|
|
|
} else if ((key->eth.type == htons(ETH_P_ARP) ||
|
|
key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
|
|
struct arp_eth_header *arp;
|
|
|
|
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) {
|
|
|
|
/* We only match on the lower 8 bits of the opcode. */
|
|
if (ntohs(arp->ar_op) <= 0xff)
|
|
key->ip.proto = ntohs(arp->ar_op);
|
|
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));
|
|
memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN);
|
|
memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN);
|
|
}
|
|
} 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) {
|
|
skb->transport_header = skb->network_header;
|
|
error = 0;
|
|
} else {
|
|
error = nh_len;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
if (key->ip.frag == OVS_FRAG_TYPE_LATER)
|
|
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->ipv6.tp.src = tcp->source;
|
|
key->ipv6.tp.dst = tcp->dest;
|
|
}
|
|
} else if (key->ip.proto == NEXTHDR_UDP) {
|
|
if (udphdr_ok(skb)) {
|
|
struct udphdr *udp = udp_hdr(skb);
|
|
key->ipv6.tp.src = udp->source;
|
|
key->ipv6.tp.dst = udp->dest;
|
|
}
|
|
} else if (key->ip.proto == NEXTHDR_SCTP) {
|
|
if (sctphdr_ok(skb)) {
|
|
struct sctphdr *sctp = sctp_hdr(skb);
|
|
key->ipv6.tp.src = sctp->source;
|
|
key->ipv6.tp.dst = sctp->dest;
|
|
}
|
|
} else if (key->ip.proto == NEXTHDR_ICMP) {
|
|
if (icmp6hdr_ok(skb)) {
|
|
error = parse_icmpv6(skb, key, nh_len);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u32 ovs_flow_hash(const struct sw_flow_key *key, int key_start, int key_len)
|
|
{
|
|
return jhash2((u32 *)((u8 *)key + key_start),
|
|
DIV_ROUND_UP(key_len - key_start, sizeof(u32)), 0);
|
|
}
|
|
|
|
static int flow_key_start(const struct sw_flow_key *key)
|
|
{
|
|
if (key->tun_key.ipv4_dst)
|
|
return 0;
|
|
else
|
|
return offsetof(struct sw_flow_key, phy);
|
|
}
|
|
|
|
static bool __cmp_key(const struct sw_flow_key *key1,
|
|
const struct sw_flow_key *key2, int key_start, int key_len)
|
|
{
|
|
return !memcmp((u8 *)key1 + key_start,
|
|
(u8 *)key2 + key_start, (key_len - key_start));
|
|
}
|
|
|
|
static bool __flow_cmp_key(const struct sw_flow *flow,
|
|
const struct sw_flow_key *key, int key_start, int key_len)
|
|
{
|
|
return __cmp_key(&flow->key, key, key_start, key_len);
|
|
}
|
|
|
|
static bool __flow_cmp_unmasked_key(const struct sw_flow *flow,
|
|
const struct sw_flow_key *key, int key_start, int key_len)
|
|
{
|
|
return __cmp_key(&flow->unmasked_key, key, key_start, key_len);
|
|
}
|
|
|
|
bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
|
|
const struct sw_flow_key *key, int key_len)
|
|
{
|
|
int key_start;
|
|
key_start = flow_key_start(key);
|
|
|
|
return __flow_cmp_unmasked_key(flow, key, key_start, key_len);
|
|
|
|
}
|
|
|
|
struct sw_flow *ovs_flow_lookup_unmasked_key(struct flow_table *table,
|
|
struct sw_flow_match *match)
|
|
{
|
|
struct sw_flow_key *unmasked = match->key;
|
|
int key_len = match->range.end;
|
|
struct sw_flow *flow;
|
|
|
|
flow = ovs_flow_lookup(table, unmasked);
|
|
if (flow && (!ovs_flow_cmp_unmasked_key(flow, unmasked, key_len)))
|
|
flow = NULL;
|
|
|
|
return flow;
|
|
}
|
|
|
|
static struct sw_flow *ovs_masked_flow_lookup(struct flow_table *table,
|
|
const struct sw_flow_key *flow_key,
|
|
struct sw_flow_mask *mask)
|
|
{
|
|
struct sw_flow *flow;
|
|
struct hlist_head *head;
|
|
int key_start = mask->range.start;
|
|
int key_len = mask->range.end;
|
|
u32 hash;
|
|
struct sw_flow_key masked_key;
|
|
|
|
ovs_flow_key_mask(&masked_key, flow_key, mask);
|
|
hash = ovs_flow_hash(&masked_key, key_start, key_len);
|
|
head = find_bucket(table, hash);
|
|
hlist_for_each_entry_rcu(flow, head, hash_node[table->node_ver]) {
|
|
if (flow->mask == mask &&
|
|
__flow_cmp_key(flow, &masked_key, key_start, key_len))
|
|
return flow;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct sw_flow *ovs_flow_lookup(struct flow_table *tbl,
|
|
const struct sw_flow_key *key)
|
|
{
|
|
struct sw_flow *flow = NULL;
|
|
struct sw_flow_mask *mask;
|
|
|
|
list_for_each_entry_rcu(mask, tbl->mask_list, list) {
|
|
flow = ovs_masked_flow_lookup(tbl, key, mask);
|
|
if (flow) /* Found */
|
|
break;
|
|
}
|
|
|
|
return flow;
|
|
}
|
|
|
|
|
|
void ovs_flow_insert(struct flow_table *table, struct sw_flow *flow)
|
|
{
|
|
flow->hash = ovs_flow_hash(&flow->key, flow->mask->range.start,
|
|
flow->mask->range.end);
|
|
__tbl_insert(table, flow);
|
|
}
|
|
|
|
void ovs_flow_remove(struct flow_table *table, struct sw_flow *flow)
|
|
{
|
|
BUG_ON(table->count == 0);
|
|
hlist_del_rcu(&flow->hash_node[table->node_ver]);
|
|
table->count--;
|
|
}
|
|
|
|
/* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */
|
|
const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
|
|
[OVS_KEY_ATTR_ENCAP] = -1,
|
|
[OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
|
|
[OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
|
|
[OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
|
|
[OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
|
|
[OVS_KEY_ATTR_VLAN] = sizeof(__be16),
|
|
[OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
|
|
[OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
|
|
[OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
|
|
[OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
|
|
[OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
|
|
[OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp),
|
|
[OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
|
|
[OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
|
|
[OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
|
|
[OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
|
|
[OVS_KEY_ATTR_TUNNEL] = -1,
|
|
};
|
|
|
|
static bool is_all_zero(const u8 *fp, size_t size)
|
|
{
|
|
int i;
|
|
|
|
if (!fp)
|
|
return false;
|
|
|
|
for (i = 0; i < size; i++)
|
|
if (fp[i])
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int __parse_flow_nlattrs(const struct nlattr *attr,
|
|
const struct nlattr *a[],
|
|
u64 *attrsp, bool nz)
|
|
{
|
|
const struct nlattr *nla;
|
|
u32 attrs;
|
|
int rem;
|
|
|
|
attrs = *attrsp;
|
|
nla_for_each_nested(nla, attr, rem) {
|
|
u16 type = nla_type(nla);
|
|
int expected_len;
|
|
|
|
if (type > OVS_KEY_ATTR_MAX) {
|
|
OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n",
|
|
type, OVS_KEY_ATTR_MAX);
|
|
}
|
|
|
|
if (attrs & (1 << type)) {
|
|
OVS_NLERR("Duplicate key attribute (type %d).\n", type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
expected_len = ovs_key_lens[type];
|
|
if (nla_len(nla) != expected_len && expected_len != -1) {
|
|
OVS_NLERR("Key attribute has unexpected length (type=%d"
|
|
", length=%d, expected=%d).\n", type,
|
|
nla_len(nla), expected_len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
|
|
attrs |= 1 << type;
|
|
a[type] = nla;
|
|
}
|
|
}
|
|
if (rem) {
|
|
OVS_NLERR("Message has %d unknown bytes.\n", rem);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*attrsp = attrs;
|
|
return 0;
|
|
}
|
|
|
|
static int parse_flow_mask_nlattrs(const struct nlattr *attr,
|
|
const struct nlattr *a[], u64 *attrsp)
|
|
{
|
|
return __parse_flow_nlattrs(attr, a, attrsp, true);
|
|
}
|
|
|
|
static int parse_flow_nlattrs(const struct nlattr *attr,
|
|
const struct nlattr *a[], u64 *attrsp)
|
|
{
|
|
return __parse_flow_nlattrs(attr, a, attrsp, false);
|
|
}
|
|
|
|
int ovs_ipv4_tun_from_nlattr(const struct nlattr *attr,
|
|
struct sw_flow_match *match, bool is_mask)
|
|
{
|
|
struct nlattr *a;
|
|
int rem;
|
|
bool ttl = false;
|
|
__be16 tun_flags = 0;
|
|
|
|
nla_for_each_nested(a, attr, rem) {
|
|
int type = nla_type(a);
|
|
static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
|
|
[OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
|
|
[OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
|
|
[OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
|
|
[OVS_TUNNEL_KEY_ATTR_TOS] = 1,
|
|
[OVS_TUNNEL_KEY_ATTR_TTL] = 1,
|
|
[OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
|
|
[OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
|
|
};
|
|
|
|
if (type > OVS_TUNNEL_KEY_ATTR_MAX) {
|
|
OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n",
|
|
type, OVS_TUNNEL_KEY_ATTR_MAX);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ovs_tunnel_key_lens[type] != nla_len(a)) {
|
|
OVS_NLERR("IPv4 tunnel attribute type has unexpected "
|
|
" length (type=%d, length=%d, expected=%d).\n",
|
|
type, nla_len(a), ovs_tunnel_key_lens[type]);
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (type) {
|
|
case OVS_TUNNEL_KEY_ATTR_ID:
|
|
SW_FLOW_KEY_PUT(match, tun_key.tun_id,
|
|
nla_get_be64(a), is_mask);
|
|
tun_flags |= TUNNEL_KEY;
|
|
break;
|
|
case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
|
|
SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
|
|
nla_get_be32(a), is_mask);
|
|
break;
|
|
case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
|
|
SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
|
|
nla_get_be32(a), is_mask);
|
|
break;
|
|
case OVS_TUNNEL_KEY_ATTR_TOS:
|
|
SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
|
|
nla_get_u8(a), is_mask);
|
|
break;
|
|
case OVS_TUNNEL_KEY_ATTR_TTL:
|
|
SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
|
|
nla_get_u8(a), is_mask);
|
|
ttl = true;
|
|
break;
|
|
case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
|
|
tun_flags |= TUNNEL_DONT_FRAGMENT;
|
|
break;
|
|
case OVS_TUNNEL_KEY_ATTR_CSUM:
|
|
tun_flags |= TUNNEL_CSUM;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
|
|
|
|
if (rem > 0) {
|
|
OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!is_mask) {
|
|
if (!match->key->tun_key.ipv4_dst) {
|
|
OVS_NLERR("IPv4 tunnel destination address is zero.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!ttl) {
|
|
OVS_NLERR("IPv4 tunnel TTL not specified.\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ovs_ipv4_tun_to_nlattr(struct sk_buff *skb,
|
|
const struct ovs_key_ipv4_tunnel *tun_key,
|
|
const struct ovs_key_ipv4_tunnel *output)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
|
|
if (!nla)
|
|
return -EMSGSIZE;
|
|
|
|
if (output->tun_flags & TUNNEL_KEY &&
|
|
nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
|
|
return -EMSGSIZE;
|
|
if (output->ipv4_src &&
|
|
nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
|
|
return -EMSGSIZE;
|
|
if (output->ipv4_dst &&
|
|
nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
|
|
return -EMSGSIZE;
|
|
if (output->ipv4_tos &&
|
|
nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
|
|
return -EMSGSIZE;
|
|
if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
|
|
return -EMSGSIZE;
|
|
if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) &&
|
|
nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
|
|
return -EMSGSIZE;
|
|
if ((output->tun_flags & TUNNEL_CSUM) &&
|
|
nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
|
|
return -EMSGSIZE;
|
|
|
|
nla_nest_end(skb, nla);
|
|
return 0;
|
|
}
|
|
|
|
static int metadata_from_nlattrs(struct sw_flow_match *match, u64 *attrs,
|
|
const struct nlattr **a, bool is_mask)
|
|
{
|
|
if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
|
|
SW_FLOW_KEY_PUT(match, phy.priority,
|
|
nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
|
|
*attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
|
|
}
|
|
|
|
if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
|
|
u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
|
|
|
|
if (is_mask)
|
|
in_port = 0xffffffff; /* Always exact match in_port. */
|
|
else if (in_port >= DP_MAX_PORTS)
|
|
return -EINVAL;
|
|
|
|
SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
|
|
*attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
|
|
} else if (!is_mask) {
|
|
SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
|
|
}
|
|
|
|
if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) {
|
|
uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
|
|
|
|
SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
|
|
*attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK);
|
|
}
|
|
if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) {
|
|
if (ovs_ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
|
|
is_mask))
|
|
return -EINVAL;
|
|
*attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
|
|
const struct nlattr **a, bool is_mask)
|
|
{
|
|
int err;
|
|
u64 orig_attrs = attrs;
|
|
|
|
err = metadata_from_nlattrs(match, &attrs, a, is_mask);
|
|
if (err)
|
|
return err;
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) {
|
|
const struct ovs_key_ethernet *eth_key;
|
|
|
|
eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
|
|
SW_FLOW_KEY_MEMCPY(match, eth.src,
|
|
eth_key->eth_src, ETH_ALEN, is_mask);
|
|
SW_FLOW_KEY_MEMCPY(match, eth.dst,
|
|
eth_key->eth_dst, ETH_ALEN, is_mask);
|
|
attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
|
|
__be16 tci;
|
|
|
|
tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
|
|
if (!(tci & htons(VLAN_TAG_PRESENT))) {
|
|
if (is_mask)
|
|
OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n");
|
|
else
|
|
OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n");
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
|
|
attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
|
|
} else if (!is_mask)
|
|
SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
|
|
__be16 eth_type;
|
|
|
|
eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
|
|
if (is_mask) {
|
|
/* Always exact match EtherType. */
|
|
eth_type = htons(0xffff);
|
|
} else if (ntohs(eth_type) < ETH_P_802_3_MIN) {
|
|
OVS_NLERR("EtherType is less than minimum (type=%x, min=%x).\n",
|
|
ntohs(eth_type), ETH_P_802_3_MIN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
|
|
attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
|
|
} else if (!is_mask) {
|
|
SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
|
|
const struct ovs_key_ipv4 *ipv4_key;
|
|
|
|
ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
|
|
if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) {
|
|
OVS_NLERR("Unknown IPv4 fragment type (value=%d, max=%d).\n",
|
|
ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX);
|
|
return -EINVAL;
|
|
}
|
|
SW_FLOW_KEY_PUT(match, ip.proto,
|
|
ipv4_key->ipv4_proto, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ip.tos,
|
|
ipv4_key->ipv4_tos, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ip.ttl,
|
|
ipv4_key->ipv4_ttl, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ip.frag,
|
|
ipv4_key->ipv4_frag, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv4.addr.src,
|
|
ipv4_key->ipv4_src, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
|
|
ipv4_key->ipv4_dst, is_mask);
|
|
attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
|
|
const struct ovs_key_ipv6 *ipv6_key;
|
|
|
|
ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
|
|
if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) {
|
|
OVS_NLERR("Unknown IPv6 fragment type (value=%d, max=%d).\n",
|
|
ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX);
|
|
return -EINVAL;
|
|
}
|
|
SW_FLOW_KEY_PUT(match, ipv6.label,
|
|
ipv6_key->ipv6_label, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ip.proto,
|
|
ipv6_key->ipv6_proto, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ip.tos,
|
|
ipv6_key->ipv6_tclass, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ip.ttl,
|
|
ipv6_key->ipv6_hlimit, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ip.frag,
|
|
ipv6_key->ipv6_frag, is_mask);
|
|
SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
|
|
ipv6_key->ipv6_src,
|
|
sizeof(match->key->ipv6.addr.src),
|
|
is_mask);
|
|
SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
|
|
ipv6_key->ipv6_dst,
|
|
sizeof(match->key->ipv6.addr.dst),
|
|
is_mask);
|
|
|
|
attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
|
|
const struct ovs_key_arp *arp_key;
|
|
|
|
arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
|
|
if (!is_mask && (arp_key->arp_op & htons(0xff00))) {
|
|
OVS_NLERR("Unknown ARP opcode (opcode=%d).\n",
|
|
arp_key->arp_op);
|
|
return -EINVAL;
|
|
}
|
|
|
|
SW_FLOW_KEY_PUT(match, ipv4.addr.src,
|
|
arp_key->arp_sip, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
|
|
arp_key->arp_tip, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ip.proto,
|
|
ntohs(arp_key->arp_op), is_mask);
|
|
SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
|
|
arp_key->arp_sha, ETH_ALEN, is_mask);
|
|
SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
|
|
arp_key->arp_tha, ETH_ALEN, is_mask);
|
|
|
|
attrs &= ~(1 << OVS_KEY_ATTR_ARP);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_TCP)) {
|
|
const struct ovs_key_tcp *tcp_key;
|
|
|
|
tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
|
|
if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
|
|
SW_FLOW_KEY_PUT(match, ipv4.tp.src,
|
|
tcp_key->tcp_src, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
|
|
tcp_key->tcp_dst, is_mask);
|
|
} else {
|
|
SW_FLOW_KEY_PUT(match, ipv6.tp.src,
|
|
tcp_key->tcp_src, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
|
|
tcp_key->tcp_dst, is_mask);
|
|
}
|
|
attrs &= ~(1 << OVS_KEY_ATTR_TCP);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_UDP)) {
|
|
const struct ovs_key_udp *udp_key;
|
|
|
|
udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
|
|
if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
|
|
SW_FLOW_KEY_PUT(match, ipv4.tp.src,
|
|
udp_key->udp_src, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
|
|
udp_key->udp_dst, is_mask);
|
|
} else {
|
|
SW_FLOW_KEY_PUT(match, ipv6.tp.src,
|
|
udp_key->udp_src, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
|
|
udp_key->udp_dst, is_mask);
|
|
}
|
|
attrs &= ~(1 << OVS_KEY_ATTR_UDP);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
|
|
const struct ovs_key_sctp *sctp_key;
|
|
|
|
sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
|
|
if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
|
|
SW_FLOW_KEY_PUT(match, ipv4.tp.src,
|
|
sctp_key->sctp_src, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
|
|
sctp_key->sctp_dst, is_mask);
|
|
} else {
|
|
SW_FLOW_KEY_PUT(match, ipv6.tp.src,
|
|
sctp_key->sctp_src, is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
|
|
sctp_key->sctp_dst, is_mask);
|
|
}
|
|
attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
|
|
const struct ovs_key_icmp *icmp_key;
|
|
|
|
icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
|
|
SW_FLOW_KEY_PUT(match, ipv4.tp.src,
|
|
htons(icmp_key->icmp_type), is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
|
|
htons(icmp_key->icmp_code), is_mask);
|
|
attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) {
|
|
const struct ovs_key_icmpv6 *icmpv6_key;
|
|
|
|
icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
|
|
SW_FLOW_KEY_PUT(match, ipv6.tp.src,
|
|
htons(icmpv6_key->icmpv6_type), is_mask);
|
|
SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
|
|
htons(icmpv6_key->icmpv6_code), is_mask);
|
|
attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
|
|
}
|
|
|
|
if (attrs & (1 << OVS_KEY_ATTR_ND)) {
|
|
const struct ovs_key_nd *nd_key;
|
|
|
|
nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
|
|
SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
|
|
nd_key->nd_target,
|
|
sizeof(match->key->ipv6.nd.target),
|
|
is_mask);
|
|
SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
|
|
nd_key->nd_sll, ETH_ALEN, is_mask);
|
|
SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
|
|
nd_key->nd_tll, ETH_ALEN, is_mask);
|
|
attrs &= ~(1 << OVS_KEY_ATTR_ND);
|
|
}
|
|
|
|
if (attrs != 0)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ovs_match_from_nlattrs - parses Netlink attributes into a flow key and
|
|
* mask. In case the 'mask' is NULL, the flow is treated as exact match
|
|
* flow. Otherwise, it is treated as a wildcarded flow, except the mask
|
|
* does not include any don't care bit.
|
|
* @match: receives the extracted flow match information.
|
|
* @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
|
|
* sequence. The fields should of the packet that triggered the creation
|
|
* of this flow.
|
|
* @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
|
|
* attribute specifies the mask field of the wildcarded flow.
|
|
*/
|
|
int ovs_match_from_nlattrs(struct sw_flow_match *match,
|
|
const struct nlattr *key,
|
|
const struct nlattr *mask)
|
|
{
|
|
const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
|
|
const struct nlattr *encap;
|
|
u64 key_attrs = 0;
|
|
u64 mask_attrs = 0;
|
|
bool encap_valid = false;
|
|
int err;
|
|
|
|
err = parse_flow_nlattrs(key, a, &key_attrs);
|
|
if (err)
|
|
return err;
|
|
|
|
if ((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
|
|
(key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
|
|
(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
|
|
__be16 tci;
|
|
|
|
if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
|
|
(key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
|
|
OVS_NLERR("Invalid Vlan frame.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
|
|
tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
|
|
encap = a[OVS_KEY_ATTR_ENCAP];
|
|
key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
|
|
encap_valid = true;
|
|
|
|
if (tci & htons(VLAN_TAG_PRESENT)) {
|
|
err = parse_flow_nlattrs(encap, a, &key_attrs);
|
|
if (err)
|
|
return err;
|
|
} else if (!tci) {
|
|
/* Corner case for truncated 802.1Q header. */
|
|
if (nla_len(encap)) {
|
|
OVS_NLERR("Truncated 802.1Q header has non-zero encap attribute.\n");
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
err = ovs_key_from_nlattrs(match, key_attrs, a, false);
|
|
if (err)
|
|
return err;
|
|
|
|
if (mask) {
|
|
err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
|
|
if (err)
|
|
return err;
|
|
|
|
if (mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP) {
|
|
__be16 eth_type = 0;
|
|
__be16 tci = 0;
|
|
|
|
if (!encap_valid) {
|
|
OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mask_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
|
|
if (a[OVS_KEY_ATTR_ETHERTYPE])
|
|
eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
|
|
|
|
if (eth_type == htons(0xffff)) {
|
|
mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
|
|
encap = a[OVS_KEY_ATTR_ENCAP];
|
|
err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
|
|
} else {
|
|
OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n",
|
|
ntohs(eth_type));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (a[OVS_KEY_ATTR_VLAN])
|
|
tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
|
|
|
|
if (!(tci & htons(VLAN_TAG_PRESENT))) {
|
|
OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci));
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
err = ovs_key_from_nlattrs(match, mask_attrs, a, true);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
/* Populate exact match flow's key mask. */
|
|
if (match->mask)
|
|
ovs_sw_flow_mask_set(match->mask, &match->range, 0xff);
|
|
}
|
|
|
|
if (!ovs_match_validate(match, key_attrs, mask_attrs))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key.
|
|
* @flow: Receives extracted in_port, priority, tun_key and skb_mark.
|
|
* @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
|
|
* sequence.
|
|
*
|
|
* This parses a series of Netlink attributes that form a flow key, which must
|
|
* take the same form accepted by flow_from_nlattrs(), but only enough of it to
|
|
* get the metadata, that is, the parts of the flow key that cannot be
|
|
* extracted from the packet itself.
|
|
*/
|
|
|
|
int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow,
|
|
const struct nlattr *attr)
|
|
{
|
|
struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
|
|
const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
|
|
u64 attrs = 0;
|
|
int err;
|
|
struct sw_flow_match match;
|
|
|
|
flow->key.phy.in_port = DP_MAX_PORTS;
|
|
flow->key.phy.priority = 0;
|
|
flow->key.phy.skb_mark = 0;
|
|
memset(tun_key, 0, sizeof(flow->key.tun_key));
|
|
|
|
err = parse_flow_nlattrs(attr, a, &attrs);
|
|
if (err)
|
|
return -EINVAL;
|
|
|
|
memset(&match, 0, sizeof(match));
|
|
match.key = &flow->key;
|
|
|
|
err = metadata_from_nlattrs(&match, &attrs, a, false);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey,
|
|
const struct sw_flow_key *output, struct sk_buff *skb)
|
|
{
|
|
struct ovs_key_ethernet *eth_key;
|
|
struct nlattr *nla, *encap;
|
|
bool is_mask = (swkey != output);
|
|
|
|
if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
|
|
goto nla_put_failure;
|
|
|
|
if ((swkey->tun_key.ipv4_dst || is_mask) &&
|
|
ovs_ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key))
|
|
goto nla_put_failure;
|
|
|
|
if (swkey->phy.in_port == DP_MAX_PORTS) {
|
|
if (is_mask && (output->phy.in_port == 0xffff))
|
|
if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff))
|
|
goto nla_put_failure;
|
|
} else {
|
|
u16 upper_u16;
|
|
upper_u16 = !is_mask ? 0 : 0xffff;
|
|
|
|
if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
|
|
(upper_u16 << 16) | output->phy.in_port))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
|
|
goto nla_put_failure;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
|
|
eth_key = nla_data(nla);
|
|
memcpy(eth_key->eth_src, output->eth.src, ETH_ALEN);
|
|
memcpy(eth_key->eth_dst, output->eth.dst, ETH_ALEN);
|
|
|
|
if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
|
|
__be16 eth_type;
|
|
eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
|
|
if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
|
|
nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
|
|
goto nla_put_failure;
|
|
encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
|
|
if (!swkey->eth.tci)
|
|
goto unencap;
|
|
} else
|
|
encap = NULL;
|
|
|
|
if (swkey->eth.type == htons(ETH_P_802_2)) {
|
|
/*
|
|
* Ethertype 802.2 is represented in the netlink with omitted
|
|
* OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and
|
|
* 0xffff in the mask attribute. Ethertype can also
|
|
* be wildcarded.
|
|
*/
|
|
if (is_mask && output->eth.type)
|
|
if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
|
|
output->eth.type))
|
|
goto nla_put_failure;
|
|
goto unencap;
|
|
}
|
|
|
|
if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
|
|
goto nla_put_failure;
|
|
|
|
if (swkey->eth.type == htons(ETH_P_IP)) {
|
|
struct ovs_key_ipv4 *ipv4_key;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
ipv4_key = nla_data(nla);
|
|
ipv4_key->ipv4_src = output->ipv4.addr.src;
|
|
ipv4_key->ipv4_dst = output->ipv4.addr.dst;
|
|
ipv4_key->ipv4_proto = output->ip.proto;
|
|
ipv4_key->ipv4_tos = output->ip.tos;
|
|
ipv4_key->ipv4_ttl = output->ip.ttl;
|
|
ipv4_key->ipv4_frag = output->ip.frag;
|
|
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
|
|
struct ovs_key_ipv6 *ipv6_key;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
ipv6_key = nla_data(nla);
|
|
memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
|
|
sizeof(ipv6_key->ipv6_src));
|
|
memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
|
|
sizeof(ipv6_key->ipv6_dst));
|
|
ipv6_key->ipv6_label = output->ipv6.label;
|
|
ipv6_key->ipv6_proto = output->ip.proto;
|
|
ipv6_key->ipv6_tclass = output->ip.tos;
|
|
ipv6_key->ipv6_hlimit = output->ip.ttl;
|
|
ipv6_key->ipv6_frag = output->ip.frag;
|
|
} else if (swkey->eth.type == htons(ETH_P_ARP) ||
|
|
swkey->eth.type == htons(ETH_P_RARP)) {
|
|
struct ovs_key_arp *arp_key;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
arp_key = nla_data(nla);
|
|
memset(arp_key, 0, sizeof(struct ovs_key_arp));
|
|
arp_key->arp_sip = output->ipv4.addr.src;
|
|
arp_key->arp_tip = output->ipv4.addr.dst;
|
|
arp_key->arp_op = htons(output->ip.proto);
|
|
memcpy(arp_key->arp_sha, output->ipv4.arp.sha, ETH_ALEN);
|
|
memcpy(arp_key->arp_tha, output->ipv4.arp.tha, ETH_ALEN);
|
|
}
|
|
|
|
if ((swkey->eth.type == htons(ETH_P_IP) ||
|
|
swkey->eth.type == htons(ETH_P_IPV6)) &&
|
|
swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
|
|
|
|
if (swkey->ip.proto == IPPROTO_TCP) {
|
|
struct ovs_key_tcp *tcp_key;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
tcp_key = nla_data(nla);
|
|
if (swkey->eth.type == htons(ETH_P_IP)) {
|
|
tcp_key->tcp_src = output->ipv4.tp.src;
|
|
tcp_key->tcp_dst = output->ipv4.tp.dst;
|
|
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
|
|
tcp_key->tcp_src = output->ipv6.tp.src;
|
|
tcp_key->tcp_dst = output->ipv6.tp.dst;
|
|
}
|
|
} else if (swkey->ip.proto == IPPROTO_UDP) {
|
|
struct ovs_key_udp *udp_key;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
udp_key = nla_data(nla);
|
|
if (swkey->eth.type == htons(ETH_P_IP)) {
|
|
udp_key->udp_src = output->ipv4.tp.src;
|
|
udp_key->udp_dst = output->ipv4.tp.dst;
|
|
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
|
|
udp_key->udp_src = output->ipv6.tp.src;
|
|
udp_key->udp_dst = output->ipv6.tp.dst;
|
|
}
|
|
} else if (swkey->ip.proto == IPPROTO_SCTP) {
|
|
struct ovs_key_sctp *sctp_key;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
sctp_key = nla_data(nla);
|
|
if (swkey->eth.type == htons(ETH_P_IP)) {
|
|
sctp_key->sctp_src = swkey->ipv4.tp.src;
|
|
sctp_key->sctp_dst = swkey->ipv4.tp.dst;
|
|
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
|
|
sctp_key->sctp_src = swkey->ipv6.tp.src;
|
|
sctp_key->sctp_dst = swkey->ipv6.tp.dst;
|
|
}
|
|
} else if (swkey->eth.type == htons(ETH_P_IP) &&
|
|
swkey->ip.proto == IPPROTO_ICMP) {
|
|
struct ovs_key_icmp *icmp_key;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
icmp_key = nla_data(nla);
|
|
icmp_key->icmp_type = ntohs(output->ipv4.tp.src);
|
|
icmp_key->icmp_code = ntohs(output->ipv4.tp.dst);
|
|
} else if (swkey->eth.type == htons(ETH_P_IPV6) &&
|
|
swkey->ip.proto == IPPROTO_ICMPV6) {
|
|
struct ovs_key_icmpv6 *icmpv6_key;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
|
|
sizeof(*icmpv6_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
icmpv6_key = nla_data(nla);
|
|
icmpv6_key->icmpv6_type = ntohs(output->ipv6.tp.src);
|
|
icmpv6_key->icmpv6_code = ntohs(output->ipv6.tp.dst);
|
|
|
|
if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
|
|
icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
|
|
struct ovs_key_nd *nd_key;
|
|
|
|
nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
|
|
if (!nla)
|
|
goto nla_put_failure;
|
|
nd_key = nla_data(nla);
|
|
memcpy(nd_key->nd_target, &output->ipv6.nd.target,
|
|
sizeof(nd_key->nd_target));
|
|
memcpy(nd_key->nd_sll, output->ipv6.nd.sll, ETH_ALEN);
|
|
memcpy(nd_key->nd_tll, output->ipv6.nd.tll, ETH_ALEN);
|
|
}
|
|
}
|
|
}
|
|
|
|
unencap:
|
|
if (encap)
|
|
nla_nest_end(skb, encap);
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* Initializes the flow module.
|
|
* Returns zero if successful or a negative error code. */
|
|
int ovs_flow_init(void)
|
|
{
|
|
flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0,
|
|
0, NULL);
|
|
if (flow_cache == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Uninitializes the flow module. */
|
|
void ovs_flow_exit(void)
|
|
{
|
|
kmem_cache_destroy(flow_cache);
|
|
}
|
|
|
|
struct sw_flow_mask *ovs_sw_flow_mask_alloc(void)
|
|
{
|
|
struct sw_flow_mask *mask;
|
|
|
|
mask = kmalloc(sizeof(*mask), GFP_KERNEL);
|
|
if (mask)
|
|
mask->ref_count = 0;
|
|
|
|
return mask;
|
|
}
|
|
|
|
void ovs_sw_flow_mask_add_ref(struct sw_flow_mask *mask)
|
|
{
|
|
mask->ref_count++;
|
|
}
|
|
|
|
void ovs_sw_flow_mask_del_ref(struct sw_flow_mask *mask, bool deferred)
|
|
{
|
|
if (!mask)
|
|
return;
|
|
|
|
BUG_ON(!mask->ref_count);
|
|
mask->ref_count--;
|
|
|
|
if (!mask->ref_count) {
|
|
list_del_rcu(&mask->list);
|
|
if (deferred)
|
|
kfree_rcu(mask, rcu);
|
|
else
|
|
kfree(mask);
|
|
}
|
|
}
|
|
|
|
static bool ovs_sw_flow_mask_equal(const struct sw_flow_mask *a,
|
|
const struct sw_flow_mask *b)
|
|
{
|
|
u8 *a_ = (u8 *)&a->key + a->range.start;
|
|
u8 *b_ = (u8 *)&b->key + b->range.start;
|
|
|
|
return (a->range.end == b->range.end)
|
|
&& (a->range.start == b->range.start)
|
|
&& (memcmp(a_, b_, ovs_sw_flow_mask_actual_size(a)) == 0);
|
|
}
|
|
|
|
struct sw_flow_mask *ovs_sw_flow_mask_find(const struct flow_table *tbl,
|
|
const struct sw_flow_mask *mask)
|
|
{
|
|
struct list_head *ml;
|
|
|
|
list_for_each(ml, tbl->mask_list) {
|
|
struct sw_flow_mask *m;
|
|
m = container_of(ml, struct sw_flow_mask, list);
|
|
if (ovs_sw_flow_mask_equal(mask, m))
|
|
return m;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* add a new mask into the mask list.
|
|
* The caller needs to make sure that 'mask' is not the same
|
|
* as any masks that are already on the list.
|
|
*/
|
|
void ovs_sw_flow_mask_insert(struct flow_table *tbl, struct sw_flow_mask *mask)
|
|
{
|
|
list_add_rcu(&mask->list, tbl->mask_list);
|
|
}
|
|
|
|
/**
|
|
* Set 'range' fields in the mask to the value of 'val'.
|
|
*/
|
|
static void ovs_sw_flow_mask_set(struct sw_flow_mask *mask,
|
|
struct sw_flow_key_range *range, u8 val)
|
|
{
|
|
u8 *m = (u8 *)&mask->key + range->start;
|
|
|
|
mask->range = *range;
|
|
memset(m, val, ovs_sw_flow_mask_size_roundup(mask));
|
|
}
|