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68aaf44595
Minor conflict in r8169, bug fix had two versions in net and net-next, take the net-next hunks. Signed-off-by: David S. Miller <davem@davemloft.net>
1745 lines
46 KiB
C
1745 lines
46 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/export.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/if_vlan.h>
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#include <net/dsa.h>
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#include <net/dst_metadata.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/gre.h>
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#include <net/pptp.h>
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#include <net/tipc.h>
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#include <linux/igmp.h>
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#include <linux/icmp.h>
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#include <linux/sctp.h>
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#include <linux/dccp.h>
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#include <linux/if_tunnel.h>
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#include <linux/if_pppox.h>
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#include <linux/ppp_defs.h>
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#include <linux/stddef.h>
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#include <linux/if_ether.h>
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#include <linux/mpls.h>
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#include <linux/tcp.h>
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#include <net/flow_dissector.h>
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#include <scsi/fc/fc_fcoe.h>
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#include <uapi/linux/batadv_packet.h>
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#include <linux/bpf.h>
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#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_labels.h>
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#endif
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static DEFINE_MUTEX(flow_dissector_mutex);
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static void dissector_set_key(struct flow_dissector *flow_dissector,
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enum flow_dissector_key_id key_id)
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{
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flow_dissector->used_keys |= (1 << key_id);
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}
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void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
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const struct flow_dissector_key *key,
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unsigned int key_count)
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{
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unsigned int i;
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memset(flow_dissector, 0, sizeof(*flow_dissector));
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for (i = 0; i < key_count; i++, key++) {
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/* User should make sure that every key target offset is withing
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* boundaries of unsigned short.
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*/
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BUG_ON(key->offset > USHRT_MAX);
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BUG_ON(dissector_uses_key(flow_dissector,
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key->key_id));
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dissector_set_key(flow_dissector, key->key_id);
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flow_dissector->offset[key->key_id] = key->offset;
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}
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/* Ensure that the dissector always includes control and basic key.
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* That way we are able to avoid handling lack of these in fast path.
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*/
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BUG_ON(!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_CONTROL));
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BUG_ON(!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_BASIC));
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}
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EXPORT_SYMBOL(skb_flow_dissector_init);
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int skb_flow_dissector_prog_query(const union bpf_attr *attr,
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union bpf_attr __user *uattr)
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{
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__u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids);
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u32 prog_id, prog_cnt = 0, flags = 0;
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struct bpf_prog *attached;
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struct net *net;
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if (attr->query.query_flags)
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return -EINVAL;
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net = get_net_ns_by_fd(attr->query.target_fd);
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if (IS_ERR(net))
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return PTR_ERR(net);
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rcu_read_lock();
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attached = rcu_dereference(net->flow_dissector_prog);
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if (attached) {
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prog_cnt = 1;
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prog_id = attached->aux->id;
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}
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rcu_read_unlock();
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put_net(net);
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if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags)))
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return -EFAULT;
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if (copy_to_user(&uattr->query.prog_cnt, &prog_cnt, sizeof(prog_cnt)))
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return -EFAULT;
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if (!attr->query.prog_cnt || !prog_ids || !prog_cnt)
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return 0;
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if (copy_to_user(prog_ids, &prog_id, sizeof(u32)))
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return -EFAULT;
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return 0;
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}
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int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr,
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struct bpf_prog *prog)
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{
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struct bpf_prog *attached;
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struct net *net;
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net = current->nsproxy->net_ns;
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mutex_lock(&flow_dissector_mutex);
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attached = rcu_dereference_protected(net->flow_dissector_prog,
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lockdep_is_held(&flow_dissector_mutex));
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if (attached) {
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/* Only one BPF program can be attached at a time */
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mutex_unlock(&flow_dissector_mutex);
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return -EEXIST;
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}
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rcu_assign_pointer(net->flow_dissector_prog, prog);
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mutex_unlock(&flow_dissector_mutex);
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return 0;
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}
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int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr)
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{
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struct bpf_prog *attached;
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struct net *net;
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net = current->nsproxy->net_ns;
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mutex_lock(&flow_dissector_mutex);
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attached = rcu_dereference_protected(net->flow_dissector_prog,
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lockdep_is_held(&flow_dissector_mutex));
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if (!attached) {
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mutex_unlock(&flow_dissector_mutex);
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return -ENOENT;
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}
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RCU_INIT_POINTER(net->flow_dissector_prog, NULL);
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bpf_prog_put(attached);
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mutex_unlock(&flow_dissector_mutex);
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return 0;
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}
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/**
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* skb_flow_get_be16 - extract be16 entity
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* @skb: sk_buff to extract from
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* @poff: offset to extract at
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* @data: raw buffer pointer to the packet
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* @hlen: packet header length
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*
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* The function will try to retrieve a be32 entity at
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* offset poff
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*/
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static __be16 skb_flow_get_be16(const struct sk_buff *skb, int poff,
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void *data, int hlen)
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{
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__be16 *u, _u;
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u = __skb_header_pointer(skb, poff, sizeof(_u), data, hlen, &_u);
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if (u)
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return *u;
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return 0;
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}
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/**
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* __skb_flow_get_ports - extract the upper layer ports and return them
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* @skb: sk_buff to extract the ports from
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* @thoff: transport header offset
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* @ip_proto: protocol for which to get port offset
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* @data: raw buffer pointer to the packet, if NULL use skb->data
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* @hlen: packet header length, if @data is NULL use skb_headlen(skb)
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*
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* The function will try to retrieve the ports at offset thoff + poff where poff
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* is the protocol port offset returned from proto_ports_offset
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*/
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__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
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void *data, int hlen)
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{
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int poff = proto_ports_offset(ip_proto);
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if (!data) {
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data = skb->data;
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hlen = skb_headlen(skb);
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}
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if (poff >= 0) {
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__be32 *ports, _ports;
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ports = __skb_header_pointer(skb, thoff + poff,
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sizeof(_ports), data, hlen, &_ports);
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if (ports)
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return *ports;
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}
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return 0;
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}
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EXPORT_SYMBOL(__skb_flow_get_ports);
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void skb_flow_dissect_meta(const struct sk_buff *skb,
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struct flow_dissector *flow_dissector,
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void *target_container)
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{
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struct flow_dissector_key_meta *meta;
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if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_META))
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return;
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meta = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_META,
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target_container);
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meta->ingress_ifindex = skb->skb_iif;
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}
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EXPORT_SYMBOL(skb_flow_dissect_meta);
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static void
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skb_flow_dissect_set_enc_addr_type(enum flow_dissector_key_id type,
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struct flow_dissector *flow_dissector,
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void *target_container)
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{
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struct flow_dissector_key_control *ctrl;
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if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_CONTROL))
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return;
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ctrl = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_CONTROL,
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target_container);
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ctrl->addr_type = type;
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}
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void
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skb_flow_dissect_ct(const struct sk_buff *skb,
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struct flow_dissector *flow_dissector,
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void *target_container,
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u16 *ctinfo_map,
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size_t mapsize)
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{
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#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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struct flow_dissector_key_ct *key;
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enum ip_conntrack_info ctinfo;
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struct nf_conn_labels *cl;
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struct nf_conn *ct;
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if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CT))
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return;
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ct = nf_ct_get(skb, &ctinfo);
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if (!ct)
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return;
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key = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_CT,
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target_container);
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if (ctinfo < mapsize)
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key->ct_state = ctinfo_map[ctinfo];
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#if IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)
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key->ct_zone = ct->zone.id;
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#endif
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#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
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key->ct_mark = ct->mark;
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#endif
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cl = nf_ct_labels_find(ct);
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if (cl)
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memcpy(key->ct_labels, cl->bits, sizeof(key->ct_labels));
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#endif /* CONFIG_NF_CONNTRACK */
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}
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EXPORT_SYMBOL(skb_flow_dissect_ct);
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void
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skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
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struct flow_dissector *flow_dissector,
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void *target_container)
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{
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struct ip_tunnel_info *info;
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struct ip_tunnel_key *key;
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/* A quick check to see if there might be something to do. */
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if (!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_KEYID) &&
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!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) &&
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!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) &&
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!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_CONTROL) &&
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!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_PORTS) &&
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!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_IP) &&
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!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_OPTS))
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return;
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info = skb_tunnel_info(skb);
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if (!info)
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return;
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key = &info->key;
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switch (ip_tunnel_info_af(info)) {
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case AF_INET:
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skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV4_ADDRS,
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flow_dissector,
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target_container);
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
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struct flow_dissector_key_ipv4_addrs *ipv4;
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ipv4 = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
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target_container);
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ipv4->src = key->u.ipv4.src;
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ipv4->dst = key->u.ipv4.dst;
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}
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break;
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case AF_INET6:
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skb_flow_dissect_set_enc_addr_type(FLOW_DISSECTOR_KEY_IPV6_ADDRS,
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flow_dissector,
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target_container);
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
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struct flow_dissector_key_ipv6_addrs *ipv6;
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ipv6 = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
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target_container);
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ipv6->src = key->u.ipv6.src;
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ipv6->dst = key->u.ipv6.dst;
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}
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break;
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}
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if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
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struct flow_dissector_key_keyid *keyid;
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keyid = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_KEYID,
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target_container);
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keyid->keyid = tunnel_id_to_key32(key->tun_id);
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}
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if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
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struct flow_dissector_key_ports *tp;
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tp = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_PORTS,
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target_container);
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tp->src = key->tp_src;
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tp->dst = key->tp_dst;
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}
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if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_IP)) {
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struct flow_dissector_key_ip *ip;
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ip = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_IP,
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target_container);
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ip->tos = key->tos;
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ip->ttl = key->ttl;
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}
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if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
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struct flow_dissector_key_enc_opts *enc_opt;
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enc_opt = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_ENC_OPTS,
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target_container);
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if (info->options_len) {
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enc_opt->len = info->options_len;
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ip_tunnel_info_opts_get(enc_opt->data, info);
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enc_opt->dst_opt_type = info->key.tun_flags &
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TUNNEL_OPTIONS_PRESENT;
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}
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}
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}
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EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);
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static enum flow_dissect_ret
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__skb_flow_dissect_mpls(const struct sk_buff *skb,
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struct flow_dissector *flow_dissector,
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void *target_container, void *data, int nhoff, int hlen)
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{
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struct flow_dissector_key_keyid *key_keyid;
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struct mpls_label *hdr, _hdr[2];
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u32 entry, label;
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if (!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_MPLS_ENTROPY) &&
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!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS))
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return FLOW_DISSECT_RET_OUT_GOOD;
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hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
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hlen, &_hdr);
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if (!hdr)
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return FLOW_DISSECT_RET_OUT_BAD;
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entry = ntohl(hdr[0].entry);
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label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
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if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_MPLS)) {
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struct flow_dissector_key_mpls *key_mpls;
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key_mpls = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_MPLS,
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target_container);
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key_mpls->mpls_label = label;
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key_mpls->mpls_ttl = (entry & MPLS_LS_TTL_MASK)
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>> MPLS_LS_TTL_SHIFT;
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key_mpls->mpls_tc = (entry & MPLS_LS_TC_MASK)
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>> MPLS_LS_TC_SHIFT;
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key_mpls->mpls_bos = (entry & MPLS_LS_S_MASK)
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>> MPLS_LS_S_SHIFT;
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}
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if (label == MPLS_LABEL_ENTROPY) {
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key_keyid = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
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target_container);
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key_keyid->keyid = hdr[1].entry & htonl(MPLS_LS_LABEL_MASK);
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}
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return FLOW_DISSECT_RET_OUT_GOOD;
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}
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static enum flow_dissect_ret
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__skb_flow_dissect_arp(const struct sk_buff *skb,
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struct flow_dissector *flow_dissector,
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void *target_container, void *data, int nhoff, int hlen)
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{
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struct flow_dissector_key_arp *key_arp;
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struct {
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unsigned char ar_sha[ETH_ALEN];
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unsigned char ar_sip[4];
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unsigned char ar_tha[ETH_ALEN];
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unsigned char ar_tip[4];
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} *arp_eth, _arp_eth;
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const struct arphdr *arp;
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struct arphdr _arp;
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if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_ARP))
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return FLOW_DISSECT_RET_OUT_GOOD;
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arp = __skb_header_pointer(skb, nhoff, sizeof(_arp), data,
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hlen, &_arp);
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if (!arp)
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return FLOW_DISSECT_RET_OUT_BAD;
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if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
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arp->ar_pro != htons(ETH_P_IP) ||
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arp->ar_hln != ETH_ALEN ||
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arp->ar_pln != 4 ||
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(arp->ar_op != htons(ARPOP_REPLY) &&
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arp->ar_op != htons(ARPOP_REQUEST)))
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return FLOW_DISSECT_RET_OUT_BAD;
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arp_eth = __skb_header_pointer(skb, nhoff + sizeof(_arp),
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sizeof(_arp_eth), data,
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hlen, &_arp_eth);
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if (!arp_eth)
|
|
return FLOW_DISSECT_RET_OUT_BAD;
|
|
|
|
key_arp = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_ARP,
|
|
target_container);
|
|
|
|
memcpy(&key_arp->sip, arp_eth->ar_sip, sizeof(key_arp->sip));
|
|
memcpy(&key_arp->tip, arp_eth->ar_tip, sizeof(key_arp->tip));
|
|
|
|
/* Only store the lower byte of the opcode;
|
|
* this covers ARPOP_REPLY and ARPOP_REQUEST.
|
|
*/
|
|
key_arp->op = ntohs(arp->ar_op) & 0xff;
|
|
|
|
ether_addr_copy(key_arp->sha, arp_eth->ar_sha);
|
|
ether_addr_copy(key_arp->tha, arp_eth->ar_tha);
|
|
|
|
return FLOW_DISSECT_RET_OUT_GOOD;
|
|
}
|
|
|
|
static enum flow_dissect_ret
|
|
__skb_flow_dissect_gre(const struct sk_buff *skb,
|
|
struct flow_dissector_key_control *key_control,
|
|
struct flow_dissector *flow_dissector,
|
|
void *target_container, void *data,
|
|
__be16 *p_proto, int *p_nhoff, int *p_hlen,
|
|
unsigned int flags)
|
|
{
|
|
struct flow_dissector_key_keyid *key_keyid;
|
|
struct gre_base_hdr *hdr, _hdr;
|
|
int offset = 0;
|
|
u16 gre_ver;
|
|
|
|
hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr),
|
|
data, *p_hlen, &_hdr);
|
|
if (!hdr)
|
|
return FLOW_DISSECT_RET_OUT_BAD;
|
|
|
|
/* Only look inside GRE without routing */
|
|
if (hdr->flags & GRE_ROUTING)
|
|
return FLOW_DISSECT_RET_OUT_GOOD;
|
|
|
|
/* Only look inside GRE for version 0 and 1 */
|
|
gre_ver = ntohs(hdr->flags & GRE_VERSION);
|
|
if (gre_ver > 1)
|
|
return FLOW_DISSECT_RET_OUT_GOOD;
|
|
|
|
*p_proto = hdr->protocol;
|
|
if (gre_ver) {
|
|
/* Version1 must be PPTP, and check the flags */
|
|
if (!(*p_proto == GRE_PROTO_PPP && (hdr->flags & GRE_KEY)))
|
|
return FLOW_DISSECT_RET_OUT_GOOD;
|
|
}
|
|
|
|
offset += sizeof(struct gre_base_hdr);
|
|
|
|
if (hdr->flags & GRE_CSUM)
|
|
offset += FIELD_SIZEOF(struct gre_full_hdr, csum) +
|
|
FIELD_SIZEOF(struct gre_full_hdr, reserved1);
|
|
|
|
if (hdr->flags & GRE_KEY) {
|
|
const __be32 *keyid;
|
|
__be32 _keyid;
|
|
|
|
keyid = __skb_header_pointer(skb, *p_nhoff + offset,
|
|
sizeof(_keyid),
|
|
data, *p_hlen, &_keyid);
|
|
if (!keyid)
|
|
return FLOW_DISSECT_RET_OUT_BAD;
|
|
|
|
if (dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_GRE_KEYID)) {
|
|
key_keyid = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_GRE_KEYID,
|
|
target_container);
|
|
if (gre_ver == 0)
|
|
key_keyid->keyid = *keyid;
|
|
else
|
|
key_keyid->keyid = *keyid & GRE_PPTP_KEY_MASK;
|
|
}
|
|
offset += FIELD_SIZEOF(struct gre_full_hdr, key);
|
|
}
|
|
|
|
if (hdr->flags & GRE_SEQ)
|
|
offset += FIELD_SIZEOF(struct pptp_gre_header, seq);
|
|
|
|
if (gre_ver == 0) {
|
|
if (*p_proto == htons(ETH_P_TEB)) {
|
|
const struct ethhdr *eth;
|
|
struct ethhdr _eth;
|
|
|
|
eth = __skb_header_pointer(skb, *p_nhoff + offset,
|
|
sizeof(_eth),
|
|
data, *p_hlen, &_eth);
|
|
if (!eth)
|
|
return FLOW_DISSECT_RET_OUT_BAD;
|
|
*p_proto = eth->h_proto;
|
|
offset += sizeof(*eth);
|
|
|
|
/* Cap headers that we access via pointers at the
|
|
* end of the Ethernet header as our maximum alignment
|
|
* at that point is only 2 bytes.
|
|
*/
|
|
if (NET_IP_ALIGN)
|
|
*p_hlen = *p_nhoff + offset;
|
|
}
|
|
} else { /* version 1, must be PPTP */
|
|
u8 _ppp_hdr[PPP_HDRLEN];
|
|
u8 *ppp_hdr;
|
|
|
|
if (hdr->flags & GRE_ACK)
|
|
offset += FIELD_SIZEOF(struct pptp_gre_header, ack);
|
|
|
|
ppp_hdr = __skb_header_pointer(skb, *p_nhoff + offset,
|
|
sizeof(_ppp_hdr),
|
|
data, *p_hlen, _ppp_hdr);
|
|
if (!ppp_hdr)
|
|
return FLOW_DISSECT_RET_OUT_BAD;
|
|
|
|
switch (PPP_PROTOCOL(ppp_hdr)) {
|
|
case PPP_IP:
|
|
*p_proto = htons(ETH_P_IP);
|
|
break;
|
|
case PPP_IPV6:
|
|
*p_proto = htons(ETH_P_IPV6);
|
|
break;
|
|
default:
|
|
/* Could probably catch some more like MPLS */
|
|
break;
|
|
}
|
|
|
|
offset += PPP_HDRLEN;
|
|
}
|
|
|
|
*p_nhoff += offset;
|
|
key_control->flags |= FLOW_DIS_ENCAPSULATION;
|
|
if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
|
|
return FLOW_DISSECT_RET_OUT_GOOD;
|
|
|
|
return FLOW_DISSECT_RET_PROTO_AGAIN;
|
|
}
|
|
|
|
/**
|
|
* __skb_flow_dissect_batadv() - dissect batman-adv header
|
|
* @skb: sk_buff to with the batman-adv header
|
|
* @key_control: flow dissectors control key
|
|
* @data: raw buffer pointer to the packet, if NULL use skb->data
|
|
* @p_proto: pointer used to update the protocol to process next
|
|
* @p_nhoff: pointer used to update inner network header offset
|
|
* @hlen: packet header length
|
|
* @flags: any combination of FLOW_DISSECTOR_F_*
|
|
*
|
|
* ETH_P_BATMAN packets are tried to be dissected. Only
|
|
* &struct batadv_unicast packets are actually processed because they contain an
|
|
* inner ethernet header and are usually followed by actual network header. This
|
|
* allows the flow dissector to continue processing the packet.
|
|
*
|
|
* Return: FLOW_DISSECT_RET_PROTO_AGAIN when &struct batadv_unicast was found,
|
|
* FLOW_DISSECT_RET_OUT_GOOD when dissector should stop after encapsulation,
|
|
* otherwise FLOW_DISSECT_RET_OUT_BAD
|
|
*/
|
|
static enum flow_dissect_ret
|
|
__skb_flow_dissect_batadv(const struct sk_buff *skb,
|
|
struct flow_dissector_key_control *key_control,
|
|
void *data, __be16 *p_proto, int *p_nhoff, int hlen,
|
|
unsigned int flags)
|
|
{
|
|
struct {
|
|
struct batadv_unicast_packet batadv_unicast;
|
|
struct ethhdr eth;
|
|
} *hdr, _hdr;
|
|
|
|
hdr = __skb_header_pointer(skb, *p_nhoff, sizeof(_hdr), data, hlen,
|
|
&_hdr);
|
|
if (!hdr)
|
|
return FLOW_DISSECT_RET_OUT_BAD;
|
|
|
|
if (hdr->batadv_unicast.version != BATADV_COMPAT_VERSION)
|
|
return FLOW_DISSECT_RET_OUT_BAD;
|
|
|
|
if (hdr->batadv_unicast.packet_type != BATADV_UNICAST)
|
|
return FLOW_DISSECT_RET_OUT_BAD;
|
|
|
|
*p_proto = hdr->eth.h_proto;
|
|
*p_nhoff += sizeof(*hdr);
|
|
|
|
key_control->flags |= FLOW_DIS_ENCAPSULATION;
|
|
if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
|
|
return FLOW_DISSECT_RET_OUT_GOOD;
|
|
|
|
return FLOW_DISSECT_RET_PROTO_AGAIN;
|
|
}
|
|
|
|
static void
|
|
__skb_flow_dissect_tcp(const struct sk_buff *skb,
|
|
struct flow_dissector *flow_dissector,
|
|
void *target_container, void *data, int thoff, int hlen)
|
|
{
|
|
struct flow_dissector_key_tcp *key_tcp;
|
|
struct tcphdr *th, _th;
|
|
|
|
if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_TCP))
|
|
return;
|
|
|
|
th = __skb_header_pointer(skb, thoff, sizeof(_th), data, hlen, &_th);
|
|
if (!th)
|
|
return;
|
|
|
|
if (unlikely(__tcp_hdrlen(th) < sizeof(_th)))
|
|
return;
|
|
|
|
key_tcp = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_TCP,
|
|
target_container);
|
|
key_tcp->flags = (*(__be16 *) &tcp_flag_word(th) & htons(0x0FFF));
|
|
}
|
|
|
|
static void
|
|
__skb_flow_dissect_ipv4(const struct sk_buff *skb,
|
|
struct flow_dissector *flow_dissector,
|
|
void *target_container, void *data, const struct iphdr *iph)
|
|
{
|
|
struct flow_dissector_key_ip *key_ip;
|
|
|
|
if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
|
|
return;
|
|
|
|
key_ip = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_IP,
|
|
target_container);
|
|
key_ip->tos = iph->tos;
|
|
key_ip->ttl = iph->ttl;
|
|
}
|
|
|
|
static void
|
|
__skb_flow_dissect_ipv6(const struct sk_buff *skb,
|
|
struct flow_dissector *flow_dissector,
|
|
void *target_container, void *data, const struct ipv6hdr *iph)
|
|
{
|
|
struct flow_dissector_key_ip *key_ip;
|
|
|
|
if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IP))
|
|
return;
|
|
|
|
key_ip = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_IP,
|
|
target_container);
|
|
key_ip->tos = ipv6_get_dsfield(iph);
|
|
key_ip->ttl = iph->hop_limit;
|
|
}
|
|
|
|
/* Maximum number of protocol headers that can be parsed in
|
|
* __skb_flow_dissect
|
|
*/
|
|
#define MAX_FLOW_DISSECT_HDRS 15
|
|
|
|
static bool skb_flow_dissect_allowed(int *num_hdrs)
|
|
{
|
|
++*num_hdrs;
|
|
|
|
return (*num_hdrs <= MAX_FLOW_DISSECT_HDRS);
|
|
}
|
|
|
|
static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
|
|
struct flow_dissector *flow_dissector,
|
|
void *target_container)
|
|
{
|
|
struct flow_dissector_key_control *key_control;
|
|
struct flow_dissector_key_basic *key_basic;
|
|
struct flow_dissector_key_addrs *key_addrs;
|
|
struct flow_dissector_key_ports *key_ports;
|
|
struct flow_dissector_key_tags *key_tags;
|
|
|
|
key_control = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_CONTROL,
|
|
target_container);
|
|
key_control->thoff = flow_keys->thoff;
|
|
if (flow_keys->is_frag)
|
|
key_control->flags |= FLOW_DIS_IS_FRAGMENT;
|
|
if (flow_keys->is_first_frag)
|
|
key_control->flags |= FLOW_DIS_FIRST_FRAG;
|
|
if (flow_keys->is_encap)
|
|
key_control->flags |= FLOW_DIS_ENCAPSULATION;
|
|
|
|
key_basic = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_BASIC,
|
|
target_container);
|
|
key_basic->n_proto = flow_keys->n_proto;
|
|
key_basic->ip_proto = flow_keys->ip_proto;
|
|
|
|
if (flow_keys->addr_proto == ETH_P_IP &&
|
|
dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
|
|
key_addrs = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_IPV4_ADDRS,
|
|
target_container);
|
|
key_addrs->v4addrs.src = flow_keys->ipv4_src;
|
|
key_addrs->v4addrs.dst = flow_keys->ipv4_dst;
|
|
key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
|
|
} else if (flow_keys->addr_proto == ETH_P_IPV6 &&
|
|
dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
|
|
key_addrs = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_IPV6_ADDRS,
|
|
target_container);
|
|
memcpy(&key_addrs->v6addrs, &flow_keys->ipv6_src,
|
|
sizeof(key_addrs->v6addrs));
|
|
key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
|
|
}
|
|
|
|
if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS)) {
|
|
key_ports = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_PORTS,
|
|
target_container);
|
|
key_ports->src = flow_keys->sport;
|
|
key_ports->dst = flow_keys->dport;
|
|
}
|
|
|
|
if (dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
|
|
key_tags = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_FLOW_LABEL,
|
|
target_container);
|
|
key_tags->flow_label = ntohl(flow_keys->flow_label);
|
|
}
|
|
}
|
|
|
|
bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
|
|
__be16 proto, int nhoff, int hlen, unsigned int flags)
|
|
{
|
|
struct bpf_flow_keys *flow_keys = ctx->flow_keys;
|
|
u32 result;
|
|
|
|
/* Pass parameters to the BPF program */
|
|
memset(flow_keys, 0, sizeof(*flow_keys));
|
|
flow_keys->n_proto = proto;
|
|
flow_keys->nhoff = nhoff;
|
|
flow_keys->thoff = flow_keys->nhoff;
|
|
|
|
BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG !=
|
|
(int)FLOW_DISSECTOR_F_PARSE_1ST_FRAG);
|
|
BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL !=
|
|
(int)FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
|
|
BUILD_BUG_ON((int)BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP !=
|
|
(int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
|
|
flow_keys->flags = flags;
|
|
|
|
preempt_disable();
|
|
result = BPF_PROG_RUN(prog, ctx);
|
|
preempt_enable();
|
|
|
|
flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
|
|
flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
|
|
flow_keys->nhoff, hlen);
|
|
|
|
return result == BPF_OK;
|
|
}
|
|
|
|
/**
|
|
* __skb_flow_dissect - extract the flow_keys struct and return it
|
|
* @net: associated network namespace, derived from @skb if NULL
|
|
* @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
|
|
* @flow_dissector: list of keys to dissect
|
|
* @target_container: target structure to put dissected values into
|
|
* @data: raw buffer pointer to the packet, if NULL use skb->data
|
|
* @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
|
|
* @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
|
|
* @hlen: packet header length, if @data is NULL use skb_headlen(skb)
|
|
* @flags: flags that control the dissection process, e.g.
|
|
* FLOW_DISSECTOR_F_STOP_AT_ENCAP.
|
|
*
|
|
* The function will try to retrieve individual keys into target specified
|
|
* by flow_dissector from either the skbuff or a raw buffer specified by the
|
|
* rest parameters.
|
|
*
|
|
* Caller must take care of zeroing target container memory.
|
|
*/
|
|
bool __skb_flow_dissect(const struct net *net,
|
|
const struct sk_buff *skb,
|
|
struct flow_dissector *flow_dissector,
|
|
void *target_container,
|
|
void *data, __be16 proto, int nhoff, int hlen,
|
|
unsigned int flags)
|
|
{
|
|
struct flow_dissector_key_control *key_control;
|
|
struct flow_dissector_key_basic *key_basic;
|
|
struct flow_dissector_key_addrs *key_addrs;
|
|
struct flow_dissector_key_ports *key_ports;
|
|
struct flow_dissector_key_icmp *key_icmp;
|
|
struct flow_dissector_key_tags *key_tags;
|
|
struct flow_dissector_key_vlan *key_vlan;
|
|
struct bpf_prog *attached = NULL;
|
|
enum flow_dissect_ret fdret;
|
|
enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
|
|
int num_hdrs = 0;
|
|
u8 ip_proto = 0;
|
|
bool ret;
|
|
|
|
if (!data) {
|
|
data = skb->data;
|
|
proto = skb_vlan_tag_present(skb) ?
|
|
skb->vlan_proto : skb->protocol;
|
|
nhoff = skb_network_offset(skb);
|
|
hlen = skb_headlen(skb);
|
|
#if IS_ENABLED(CONFIG_NET_DSA)
|
|
if (unlikely(skb->dev && netdev_uses_dsa(skb->dev))) {
|
|
const struct dsa_device_ops *ops;
|
|
int offset;
|
|
|
|
ops = skb->dev->dsa_ptr->tag_ops;
|
|
if (ops->flow_dissect &&
|
|
!ops->flow_dissect(skb, &proto, &offset)) {
|
|
hlen -= offset;
|
|
nhoff += offset;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* It is ensured by skb_flow_dissector_init() that control key will
|
|
* be always present.
|
|
*/
|
|
key_control = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_CONTROL,
|
|
target_container);
|
|
|
|
/* It is ensured by skb_flow_dissector_init() that basic key will
|
|
* be always present.
|
|
*/
|
|
key_basic = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_BASIC,
|
|
target_container);
|
|
|
|
if (skb) {
|
|
if (!net) {
|
|
if (skb->dev)
|
|
net = dev_net(skb->dev);
|
|
else if (skb->sk)
|
|
net = sock_net(skb->sk);
|
|
}
|
|
}
|
|
|
|
WARN_ON_ONCE(!net);
|
|
if (net) {
|
|
rcu_read_lock();
|
|
attached = rcu_dereference(net->flow_dissector_prog);
|
|
|
|
if (attached) {
|
|
struct bpf_flow_keys flow_keys;
|
|
struct bpf_flow_dissector ctx = {
|
|
.flow_keys = &flow_keys,
|
|
.data = data,
|
|
.data_end = data + hlen,
|
|
};
|
|
__be16 n_proto = proto;
|
|
|
|
if (skb) {
|
|
ctx.skb = skb;
|
|
/* we can't use 'proto' in the skb case
|
|
* because it might be set to skb->vlan_proto
|
|
* which has been pulled from the data
|
|
*/
|
|
n_proto = skb->protocol;
|
|
}
|
|
|
|
ret = bpf_flow_dissect(attached, &ctx, n_proto, nhoff,
|
|
hlen, flags);
|
|
__skb_flow_bpf_to_target(&flow_keys, flow_dissector,
|
|
target_container);
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
if (dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
|
|
struct ethhdr *eth = eth_hdr(skb);
|
|
struct flow_dissector_key_eth_addrs *key_eth_addrs;
|
|
|
|
key_eth_addrs = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_ETH_ADDRS,
|
|
target_container);
|
|
memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs));
|
|
}
|
|
|
|
proto_again:
|
|
fdret = FLOW_DISSECT_RET_CONTINUE;
|
|
|
|
switch (proto) {
|
|
case htons(ETH_P_IP): {
|
|
const struct iphdr *iph;
|
|
struct iphdr _iph;
|
|
|
|
iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
|
|
if (!iph || iph->ihl < 5) {
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
|
|
nhoff += iph->ihl * 4;
|
|
|
|
ip_proto = iph->protocol;
|
|
|
|
if (dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
|
|
key_addrs = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_IPV4_ADDRS,
|
|
target_container);
|
|
|
|
memcpy(&key_addrs->v4addrs, &iph->saddr,
|
|
sizeof(key_addrs->v4addrs));
|
|
key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
|
|
}
|
|
|
|
if (ip_is_fragment(iph)) {
|
|
key_control->flags |= FLOW_DIS_IS_FRAGMENT;
|
|
|
|
if (iph->frag_off & htons(IP_OFFSET)) {
|
|
fdret = FLOW_DISSECT_RET_OUT_GOOD;
|
|
break;
|
|
} else {
|
|
key_control->flags |= FLOW_DIS_FIRST_FRAG;
|
|
if (!(flags &
|
|
FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) {
|
|
fdret = FLOW_DISSECT_RET_OUT_GOOD;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
__skb_flow_dissect_ipv4(skb, flow_dissector,
|
|
target_container, data, iph);
|
|
|
|
break;
|
|
}
|
|
case htons(ETH_P_IPV6): {
|
|
const struct ipv6hdr *iph;
|
|
struct ipv6hdr _iph;
|
|
|
|
iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
|
|
if (!iph) {
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
|
|
ip_proto = iph->nexthdr;
|
|
nhoff += sizeof(struct ipv6hdr);
|
|
|
|
if (dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
|
|
key_addrs = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_IPV6_ADDRS,
|
|
target_container);
|
|
|
|
memcpy(&key_addrs->v6addrs, &iph->saddr,
|
|
sizeof(key_addrs->v6addrs));
|
|
key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
|
|
}
|
|
|
|
if ((dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
|
|
(flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
|
|
ip6_flowlabel(iph)) {
|
|
__be32 flow_label = ip6_flowlabel(iph);
|
|
|
|
if (dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
|
|
key_tags = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_FLOW_LABEL,
|
|
target_container);
|
|
key_tags->flow_label = ntohl(flow_label);
|
|
}
|
|
if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) {
|
|
fdret = FLOW_DISSECT_RET_OUT_GOOD;
|
|
break;
|
|
}
|
|
}
|
|
|
|
__skb_flow_dissect_ipv6(skb, flow_dissector,
|
|
target_container, data, iph);
|
|
|
|
break;
|
|
}
|
|
case htons(ETH_P_8021AD):
|
|
case htons(ETH_P_8021Q): {
|
|
const struct vlan_hdr *vlan = NULL;
|
|
struct vlan_hdr _vlan;
|
|
__be16 saved_vlan_tpid = proto;
|
|
|
|
if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
|
|
skb && skb_vlan_tag_present(skb)) {
|
|
proto = skb->protocol;
|
|
} else {
|
|
vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
|
|
data, hlen, &_vlan);
|
|
if (!vlan) {
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
|
|
proto = vlan->h_vlan_encapsulated_proto;
|
|
nhoff += sizeof(*vlan);
|
|
}
|
|
|
|
if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
|
|
dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
|
|
} else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
|
|
dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
|
|
} else {
|
|
fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
|
|
break;
|
|
}
|
|
|
|
if (dissector_uses_key(flow_dissector, dissector_vlan)) {
|
|
key_vlan = skb_flow_dissector_target(flow_dissector,
|
|
dissector_vlan,
|
|
target_container);
|
|
|
|
if (!vlan) {
|
|
key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
|
|
key_vlan->vlan_priority = skb_vlan_tag_get_prio(skb);
|
|
} else {
|
|
key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
|
|
VLAN_VID_MASK;
|
|
key_vlan->vlan_priority =
|
|
(ntohs(vlan->h_vlan_TCI) &
|
|
VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
|
|
}
|
|
key_vlan->vlan_tpid = saved_vlan_tpid;
|
|
}
|
|
|
|
fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
|
|
break;
|
|
}
|
|
case htons(ETH_P_PPP_SES): {
|
|
struct {
|
|
struct pppoe_hdr hdr;
|
|
__be16 proto;
|
|
} *hdr, _hdr;
|
|
hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
|
|
if (!hdr) {
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
|
|
proto = hdr->proto;
|
|
nhoff += PPPOE_SES_HLEN;
|
|
switch (proto) {
|
|
case htons(PPP_IP):
|
|
proto = htons(ETH_P_IP);
|
|
fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
|
|
break;
|
|
case htons(PPP_IPV6):
|
|
proto = htons(ETH_P_IPV6);
|
|
fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
|
|
break;
|
|
default:
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
case htons(ETH_P_TIPC): {
|
|
struct tipc_basic_hdr *hdr, _hdr;
|
|
|
|
hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr),
|
|
data, hlen, &_hdr);
|
|
if (!hdr) {
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
|
|
if (dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_TIPC)) {
|
|
key_addrs = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_TIPC,
|
|
target_container);
|
|
key_addrs->tipckey.key = tipc_hdr_rps_key(hdr);
|
|
key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC;
|
|
}
|
|
fdret = FLOW_DISSECT_RET_OUT_GOOD;
|
|
break;
|
|
}
|
|
|
|
case htons(ETH_P_MPLS_UC):
|
|
case htons(ETH_P_MPLS_MC):
|
|
fdret = __skb_flow_dissect_mpls(skb, flow_dissector,
|
|
target_container, data,
|
|
nhoff, hlen);
|
|
break;
|
|
case htons(ETH_P_FCOE):
|
|
if ((hlen - nhoff) < FCOE_HEADER_LEN) {
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
|
|
nhoff += FCOE_HEADER_LEN;
|
|
fdret = FLOW_DISSECT_RET_OUT_GOOD;
|
|
break;
|
|
|
|
case htons(ETH_P_ARP):
|
|
case htons(ETH_P_RARP):
|
|
fdret = __skb_flow_dissect_arp(skb, flow_dissector,
|
|
target_container, data,
|
|
nhoff, hlen);
|
|
break;
|
|
|
|
case htons(ETH_P_BATMAN):
|
|
fdret = __skb_flow_dissect_batadv(skb, key_control, data,
|
|
&proto, &nhoff, hlen, flags);
|
|
break;
|
|
|
|
default:
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
|
|
/* Process result of proto processing */
|
|
switch (fdret) {
|
|
case FLOW_DISSECT_RET_OUT_GOOD:
|
|
goto out_good;
|
|
case FLOW_DISSECT_RET_PROTO_AGAIN:
|
|
if (skb_flow_dissect_allowed(&num_hdrs))
|
|
goto proto_again;
|
|
goto out_good;
|
|
case FLOW_DISSECT_RET_CONTINUE:
|
|
case FLOW_DISSECT_RET_IPPROTO_AGAIN:
|
|
break;
|
|
case FLOW_DISSECT_RET_OUT_BAD:
|
|
default:
|
|
goto out_bad;
|
|
}
|
|
|
|
ip_proto_again:
|
|
fdret = FLOW_DISSECT_RET_CONTINUE;
|
|
|
|
switch (ip_proto) {
|
|
case IPPROTO_GRE:
|
|
fdret = __skb_flow_dissect_gre(skb, key_control, flow_dissector,
|
|
target_container, data,
|
|
&proto, &nhoff, &hlen, flags);
|
|
break;
|
|
|
|
case NEXTHDR_HOP:
|
|
case NEXTHDR_ROUTING:
|
|
case NEXTHDR_DEST: {
|
|
u8 _opthdr[2], *opthdr;
|
|
|
|
if (proto != htons(ETH_P_IPV6))
|
|
break;
|
|
|
|
opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
|
|
data, hlen, &_opthdr);
|
|
if (!opthdr) {
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
|
|
ip_proto = opthdr[0];
|
|
nhoff += (opthdr[1] + 1) << 3;
|
|
|
|
fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
|
|
break;
|
|
}
|
|
case NEXTHDR_FRAGMENT: {
|
|
struct frag_hdr _fh, *fh;
|
|
|
|
if (proto != htons(ETH_P_IPV6))
|
|
break;
|
|
|
|
fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
|
|
data, hlen, &_fh);
|
|
|
|
if (!fh) {
|
|
fdret = FLOW_DISSECT_RET_OUT_BAD;
|
|
break;
|
|
}
|
|
|
|
key_control->flags |= FLOW_DIS_IS_FRAGMENT;
|
|
|
|
nhoff += sizeof(_fh);
|
|
ip_proto = fh->nexthdr;
|
|
|
|
if (!(fh->frag_off & htons(IP6_OFFSET))) {
|
|
key_control->flags |= FLOW_DIS_FIRST_FRAG;
|
|
if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
|
|
fdret = FLOW_DISSECT_RET_IPPROTO_AGAIN;
|
|
break;
|
|
}
|
|
}
|
|
|
|
fdret = FLOW_DISSECT_RET_OUT_GOOD;
|
|
break;
|
|
}
|
|
case IPPROTO_IPIP:
|
|
proto = htons(ETH_P_IP);
|
|
|
|
key_control->flags |= FLOW_DIS_ENCAPSULATION;
|
|
if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
|
|
fdret = FLOW_DISSECT_RET_OUT_GOOD;
|
|
break;
|
|
}
|
|
|
|
fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
|
|
break;
|
|
|
|
case IPPROTO_IPV6:
|
|
proto = htons(ETH_P_IPV6);
|
|
|
|
key_control->flags |= FLOW_DIS_ENCAPSULATION;
|
|
if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) {
|
|
fdret = FLOW_DISSECT_RET_OUT_GOOD;
|
|
break;
|
|
}
|
|
|
|
fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
|
|
break;
|
|
|
|
|
|
case IPPROTO_MPLS:
|
|
proto = htons(ETH_P_MPLS_UC);
|
|
fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
|
|
break;
|
|
|
|
case IPPROTO_TCP:
|
|
__skb_flow_dissect_tcp(skb, flow_dissector, target_container,
|
|
data, nhoff, hlen);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS) &&
|
|
!(key_control->flags & FLOW_DIS_IS_FRAGMENT)) {
|
|
key_ports = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_PORTS,
|
|
target_container);
|
|
key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
|
|
data, hlen);
|
|
}
|
|
|
|
if (dissector_uses_key(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_ICMP)) {
|
|
key_icmp = skb_flow_dissector_target(flow_dissector,
|
|
FLOW_DISSECTOR_KEY_ICMP,
|
|
target_container);
|
|
key_icmp->icmp = skb_flow_get_be16(skb, nhoff, data, hlen);
|
|
}
|
|
|
|
/* Process result of IP proto processing */
|
|
switch (fdret) {
|
|
case FLOW_DISSECT_RET_PROTO_AGAIN:
|
|
if (skb_flow_dissect_allowed(&num_hdrs))
|
|
goto proto_again;
|
|
break;
|
|
case FLOW_DISSECT_RET_IPPROTO_AGAIN:
|
|
if (skb_flow_dissect_allowed(&num_hdrs))
|
|
goto ip_proto_again;
|
|
break;
|
|
case FLOW_DISSECT_RET_OUT_GOOD:
|
|
case FLOW_DISSECT_RET_CONTINUE:
|
|
break;
|
|
case FLOW_DISSECT_RET_OUT_BAD:
|
|
default:
|
|
goto out_bad;
|
|
}
|
|
|
|
out_good:
|
|
ret = true;
|
|
|
|
out:
|
|
key_control->thoff = min_t(u16, nhoff, skb ? skb->len : hlen);
|
|
key_basic->n_proto = proto;
|
|
key_basic->ip_proto = ip_proto;
|
|
|
|
return ret;
|
|
|
|
out_bad:
|
|
ret = false;
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL(__skb_flow_dissect);
|
|
|
|
static u32 hashrnd __read_mostly;
|
|
static __always_inline void __flow_hash_secret_init(void)
|
|
{
|
|
net_get_random_once(&hashrnd, sizeof(hashrnd));
|
|
}
|
|
|
|
static __always_inline u32 __flow_hash_words(const u32 *words, u32 length,
|
|
u32 keyval)
|
|
{
|
|
return jhash2(words, length, keyval);
|
|
}
|
|
|
|
static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow)
|
|
{
|
|
const void *p = flow;
|
|
|
|
BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32));
|
|
return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET);
|
|
}
|
|
|
|
static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
|
|
{
|
|
size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
|
|
BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
|
|
BUILD_BUG_ON(offsetof(typeof(*flow), addrs) !=
|
|
sizeof(*flow) - sizeof(flow->addrs));
|
|
|
|
switch (flow->control.addr_type) {
|
|
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
|
|
diff -= sizeof(flow->addrs.v4addrs);
|
|
break;
|
|
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
|
|
diff -= sizeof(flow->addrs.v6addrs);
|
|
break;
|
|
case FLOW_DISSECTOR_KEY_TIPC:
|
|
diff -= sizeof(flow->addrs.tipckey);
|
|
break;
|
|
}
|
|
return (sizeof(*flow) - diff) / sizeof(u32);
|
|
}
|
|
|
|
__be32 flow_get_u32_src(const struct flow_keys *flow)
|
|
{
|
|
switch (flow->control.addr_type) {
|
|
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
|
|
return flow->addrs.v4addrs.src;
|
|
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
|
|
return (__force __be32)ipv6_addr_hash(
|
|
&flow->addrs.v6addrs.src);
|
|
case FLOW_DISSECTOR_KEY_TIPC:
|
|
return flow->addrs.tipckey.key;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(flow_get_u32_src);
|
|
|
|
__be32 flow_get_u32_dst(const struct flow_keys *flow)
|
|
{
|
|
switch (flow->control.addr_type) {
|
|
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
|
|
return flow->addrs.v4addrs.dst;
|
|
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
|
|
return (__force __be32)ipv6_addr_hash(
|
|
&flow->addrs.v6addrs.dst);
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(flow_get_u32_dst);
|
|
|
|
static inline void __flow_hash_consistentify(struct flow_keys *keys)
|
|
{
|
|
int addr_diff, i;
|
|
|
|
switch (keys->control.addr_type) {
|
|
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
|
|
addr_diff = (__force u32)keys->addrs.v4addrs.dst -
|
|
(__force u32)keys->addrs.v4addrs.src;
|
|
if ((addr_diff < 0) ||
|
|
(addr_diff == 0 &&
|
|
((__force u16)keys->ports.dst <
|
|
(__force u16)keys->ports.src))) {
|
|
swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
|
|
swap(keys->ports.src, keys->ports.dst);
|
|
}
|
|
break;
|
|
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
|
|
addr_diff = memcmp(&keys->addrs.v6addrs.dst,
|
|
&keys->addrs.v6addrs.src,
|
|
sizeof(keys->addrs.v6addrs.dst));
|
|
if ((addr_diff < 0) ||
|
|
(addr_diff == 0 &&
|
|
((__force u16)keys->ports.dst <
|
|
(__force u16)keys->ports.src))) {
|
|
for (i = 0; i < 4; i++)
|
|
swap(keys->addrs.v6addrs.src.s6_addr32[i],
|
|
keys->addrs.v6addrs.dst.s6_addr32[i]);
|
|
swap(keys->ports.src, keys->ports.dst);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
|
|
{
|
|
u32 hash;
|
|
|
|
__flow_hash_consistentify(keys);
|
|
|
|
hash = __flow_hash_words(flow_keys_hash_start(keys),
|
|
flow_keys_hash_length(keys), keyval);
|
|
if (!hash)
|
|
hash = 1;
|
|
|
|
return hash;
|
|
}
|
|
|
|
u32 flow_hash_from_keys(struct flow_keys *keys)
|
|
{
|
|
__flow_hash_secret_init();
|
|
return __flow_hash_from_keys(keys, hashrnd);
|
|
}
|
|
EXPORT_SYMBOL(flow_hash_from_keys);
|
|
|
|
static inline u32 ___skb_get_hash(const struct sk_buff *skb,
|
|
struct flow_keys *keys, u32 keyval)
|
|
{
|
|
skb_flow_dissect_flow_keys(skb, keys,
|
|
FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
|
|
|
|
return __flow_hash_from_keys(keys, keyval);
|
|
}
|
|
|
|
struct _flow_keys_digest_data {
|
|
__be16 n_proto;
|
|
u8 ip_proto;
|
|
u8 padding;
|
|
__be32 ports;
|
|
__be32 src;
|
|
__be32 dst;
|
|
};
|
|
|
|
void make_flow_keys_digest(struct flow_keys_digest *digest,
|
|
const struct flow_keys *flow)
|
|
{
|
|
struct _flow_keys_digest_data *data =
|
|
(struct _flow_keys_digest_data *)digest;
|
|
|
|
BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
|
|
|
|
memset(digest, 0, sizeof(*digest));
|
|
|
|
data->n_proto = flow->basic.n_proto;
|
|
data->ip_proto = flow->basic.ip_proto;
|
|
data->ports = flow->ports.ports;
|
|
data->src = flow->addrs.v4addrs.src;
|
|
data->dst = flow->addrs.v4addrs.dst;
|
|
}
|
|
EXPORT_SYMBOL(make_flow_keys_digest);
|
|
|
|
static struct flow_dissector flow_keys_dissector_symmetric __read_mostly;
|
|
|
|
u32 __skb_get_hash_symmetric(const struct sk_buff *skb)
|
|
{
|
|
struct flow_keys keys;
|
|
|
|
__flow_hash_secret_init();
|
|
|
|
memset(&keys, 0, sizeof(keys));
|
|
__skb_flow_dissect(NULL, skb, &flow_keys_dissector_symmetric,
|
|
&keys, NULL, 0, 0, 0,
|
|
FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
|
|
|
|
return __flow_hash_from_keys(&keys, hashrnd);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__skb_get_hash_symmetric);
|
|
|
|
/**
|
|
* __skb_get_hash: calculate a flow hash
|
|
* @skb: sk_buff to calculate flow hash from
|
|
*
|
|
* This function calculates a flow hash based on src/dst addresses
|
|
* and src/dst port numbers. Sets hash in skb to non-zero hash value
|
|
* on success, zero indicates no valid hash. Also, sets l4_hash in skb
|
|
* if hash is a canonical 4-tuple hash over transport ports.
|
|
*/
|
|
void __skb_get_hash(struct sk_buff *skb)
|
|
{
|
|
struct flow_keys keys;
|
|
u32 hash;
|
|
|
|
__flow_hash_secret_init();
|
|
|
|
hash = ___skb_get_hash(skb, &keys, hashrnd);
|
|
|
|
__skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
|
|
}
|
|
EXPORT_SYMBOL(__skb_get_hash);
|
|
|
|
__u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb)
|
|
{
|
|
struct flow_keys keys;
|
|
|
|
return ___skb_get_hash(skb, &keys, perturb);
|
|
}
|
|
EXPORT_SYMBOL(skb_get_hash_perturb);
|
|
|
|
u32 __skb_get_poff(const struct sk_buff *skb, void *data,
|
|
const struct flow_keys_basic *keys, int hlen)
|
|
{
|
|
u32 poff = keys->control.thoff;
|
|
|
|
/* skip L4 headers for fragments after the first */
|
|
if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
|
|
!(keys->control.flags & FLOW_DIS_FIRST_FRAG))
|
|
return poff;
|
|
|
|
switch (keys->basic.ip_proto) {
|
|
case IPPROTO_TCP: {
|
|
/* access doff as u8 to avoid unaligned access */
|
|
const u8 *doff;
|
|
u8 _doff;
|
|
|
|
doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
|
|
data, hlen, &_doff);
|
|
if (!doff)
|
|
return poff;
|
|
|
|
poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
|
|
break;
|
|
}
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
poff += sizeof(struct udphdr);
|
|
break;
|
|
/* For the rest, we do not really care about header
|
|
* extensions at this point for now.
|
|
*/
|
|
case IPPROTO_ICMP:
|
|
poff += sizeof(struct icmphdr);
|
|
break;
|
|
case IPPROTO_ICMPV6:
|
|
poff += sizeof(struct icmp6hdr);
|
|
break;
|
|
case IPPROTO_IGMP:
|
|
poff += sizeof(struct igmphdr);
|
|
break;
|
|
case IPPROTO_DCCP:
|
|
poff += sizeof(struct dccp_hdr);
|
|
break;
|
|
case IPPROTO_SCTP:
|
|
poff += sizeof(struct sctphdr);
|
|
break;
|
|
}
|
|
|
|
return poff;
|
|
}
|
|
|
|
/**
|
|
* skb_get_poff - get the offset to the payload
|
|
* @skb: sk_buff to get the payload offset from
|
|
*
|
|
* The function will get the offset to the payload as far as it could
|
|
* be dissected. The main user is currently BPF, so that we can dynamically
|
|
* truncate packets without needing to push actual payload to the user
|
|
* space and can analyze headers only, instead.
|
|
*/
|
|
u32 skb_get_poff(const struct sk_buff *skb)
|
|
{
|
|
struct flow_keys_basic keys;
|
|
|
|
if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
|
|
NULL, 0, 0, 0, 0))
|
|
return 0;
|
|
|
|
return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
|
|
}
|
|
|
|
__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
|
|
{
|
|
memset(keys, 0, sizeof(*keys));
|
|
|
|
memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
|
|
sizeof(keys->addrs.v6addrs.src));
|
|
memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
|
|
sizeof(keys->addrs.v6addrs.dst));
|
|
keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
|
|
keys->ports.src = fl6->fl6_sport;
|
|
keys->ports.dst = fl6->fl6_dport;
|
|
keys->keyid.keyid = fl6->fl6_gre_key;
|
|
keys->tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
|
|
keys->basic.ip_proto = fl6->flowi6_proto;
|
|
|
|
return flow_hash_from_keys(keys);
|
|
}
|
|
EXPORT_SYMBOL(__get_hash_from_flowi6);
|
|
|
|
static const struct flow_dissector_key flow_keys_dissector_keys[] = {
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_CONTROL,
|
|
.offset = offsetof(struct flow_keys, control),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_BASIC,
|
|
.offset = offsetof(struct flow_keys, basic),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
|
|
.offset = offsetof(struct flow_keys, addrs.v4addrs),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
|
|
.offset = offsetof(struct flow_keys, addrs.v6addrs),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_TIPC,
|
|
.offset = offsetof(struct flow_keys, addrs.tipckey),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_PORTS,
|
|
.offset = offsetof(struct flow_keys, ports),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_VLAN,
|
|
.offset = offsetof(struct flow_keys, vlan),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
|
|
.offset = offsetof(struct flow_keys, tags),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
|
|
.offset = offsetof(struct flow_keys, keyid),
|
|
},
|
|
};
|
|
|
|
static const struct flow_dissector_key flow_keys_dissector_symmetric_keys[] = {
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_CONTROL,
|
|
.offset = offsetof(struct flow_keys, control),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_BASIC,
|
|
.offset = offsetof(struct flow_keys, basic),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
|
|
.offset = offsetof(struct flow_keys, addrs.v4addrs),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
|
|
.offset = offsetof(struct flow_keys, addrs.v6addrs),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_PORTS,
|
|
.offset = offsetof(struct flow_keys, ports),
|
|
},
|
|
};
|
|
|
|
static const struct flow_dissector_key flow_keys_basic_dissector_keys[] = {
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_CONTROL,
|
|
.offset = offsetof(struct flow_keys, control),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_BASIC,
|
|
.offset = offsetof(struct flow_keys, basic),
|
|
},
|
|
};
|
|
|
|
struct flow_dissector flow_keys_dissector __read_mostly;
|
|
EXPORT_SYMBOL(flow_keys_dissector);
|
|
|
|
struct flow_dissector flow_keys_basic_dissector __read_mostly;
|
|
EXPORT_SYMBOL(flow_keys_basic_dissector);
|
|
|
|
static int __init init_default_flow_dissectors(void)
|
|
{
|
|
skb_flow_dissector_init(&flow_keys_dissector,
|
|
flow_keys_dissector_keys,
|
|
ARRAY_SIZE(flow_keys_dissector_keys));
|
|
skb_flow_dissector_init(&flow_keys_dissector_symmetric,
|
|
flow_keys_dissector_symmetric_keys,
|
|
ARRAY_SIZE(flow_keys_dissector_symmetric_keys));
|
|
skb_flow_dissector_init(&flow_keys_basic_dissector,
|
|
flow_keys_basic_dissector_keys,
|
|
ARRAY_SIZE(flow_keys_basic_dissector_keys));
|
|
return 0;
|
|
}
|
|
|
|
core_initcall(init_default_flow_dissectors);
|