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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293
("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
426 lines
11 KiB
C
426 lines
11 KiB
C
#ifndef _NET_FLOW_OFFLOAD_H
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#define _NET_FLOW_OFFLOAD_H
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <net/flow_dissector.h>
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#include <linux/rhashtable.h>
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struct flow_match {
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struct flow_dissector *dissector;
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void *mask;
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void *key;
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};
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struct flow_match_meta {
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struct flow_dissector_key_meta *key, *mask;
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};
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struct flow_match_basic {
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struct flow_dissector_key_basic *key, *mask;
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};
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struct flow_match_control {
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struct flow_dissector_key_control *key, *mask;
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};
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struct flow_match_eth_addrs {
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struct flow_dissector_key_eth_addrs *key, *mask;
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};
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struct flow_match_vlan {
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struct flow_dissector_key_vlan *key, *mask;
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};
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struct flow_match_ipv4_addrs {
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struct flow_dissector_key_ipv4_addrs *key, *mask;
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};
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struct flow_match_ipv6_addrs {
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struct flow_dissector_key_ipv6_addrs *key, *mask;
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};
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struct flow_match_ip {
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struct flow_dissector_key_ip *key, *mask;
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};
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struct flow_match_ports {
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struct flow_dissector_key_ports *key, *mask;
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};
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struct flow_match_icmp {
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struct flow_dissector_key_icmp *key, *mask;
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};
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struct flow_match_tcp {
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struct flow_dissector_key_tcp *key, *mask;
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};
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struct flow_match_mpls {
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struct flow_dissector_key_mpls *key, *mask;
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};
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struct flow_match_enc_keyid {
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struct flow_dissector_key_keyid *key, *mask;
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};
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struct flow_match_enc_opts {
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struct flow_dissector_key_enc_opts *key, *mask;
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};
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struct flow_rule;
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void flow_rule_match_meta(const struct flow_rule *rule,
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struct flow_match_meta *out);
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void flow_rule_match_basic(const struct flow_rule *rule,
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struct flow_match_basic *out);
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void flow_rule_match_control(const struct flow_rule *rule,
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struct flow_match_control *out);
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void flow_rule_match_eth_addrs(const struct flow_rule *rule,
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struct flow_match_eth_addrs *out);
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void flow_rule_match_vlan(const struct flow_rule *rule,
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struct flow_match_vlan *out);
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void flow_rule_match_cvlan(const struct flow_rule *rule,
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struct flow_match_vlan *out);
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void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
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struct flow_match_ipv4_addrs *out);
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void flow_rule_match_ipv6_addrs(const struct flow_rule *rule,
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struct flow_match_ipv6_addrs *out);
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void flow_rule_match_ip(const struct flow_rule *rule,
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struct flow_match_ip *out);
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void flow_rule_match_ports(const struct flow_rule *rule,
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struct flow_match_ports *out);
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void flow_rule_match_tcp(const struct flow_rule *rule,
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struct flow_match_tcp *out);
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void flow_rule_match_icmp(const struct flow_rule *rule,
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struct flow_match_icmp *out);
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void flow_rule_match_mpls(const struct flow_rule *rule,
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struct flow_match_mpls *out);
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void flow_rule_match_enc_control(const struct flow_rule *rule,
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struct flow_match_control *out);
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void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule,
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struct flow_match_ipv4_addrs *out);
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void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule,
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struct flow_match_ipv6_addrs *out);
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void flow_rule_match_enc_ip(const struct flow_rule *rule,
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struct flow_match_ip *out);
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void flow_rule_match_enc_ports(const struct flow_rule *rule,
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struct flow_match_ports *out);
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void flow_rule_match_enc_keyid(const struct flow_rule *rule,
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struct flow_match_enc_keyid *out);
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void flow_rule_match_enc_opts(const struct flow_rule *rule,
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struct flow_match_enc_opts *out);
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enum flow_action_id {
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FLOW_ACTION_ACCEPT = 0,
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FLOW_ACTION_DROP,
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FLOW_ACTION_TRAP,
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FLOW_ACTION_GOTO,
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FLOW_ACTION_REDIRECT,
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FLOW_ACTION_MIRRED,
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FLOW_ACTION_REDIRECT_INGRESS,
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FLOW_ACTION_MIRRED_INGRESS,
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FLOW_ACTION_VLAN_PUSH,
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FLOW_ACTION_VLAN_POP,
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FLOW_ACTION_VLAN_MANGLE,
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FLOW_ACTION_TUNNEL_ENCAP,
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FLOW_ACTION_TUNNEL_DECAP,
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FLOW_ACTION_MANGLE,
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FLOW_ACTION_ADD,
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FLOW_ACTION_CSUM,
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FLOW_ACTION_MARK,
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FLOW_ACTION_PTYPE,
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FLOW_ACTION_WAKE,
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FLOW_ACTION_QUEUE,
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FLOW_ACTION_SAMPLE,
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FLOW_ACTION_POLICE,
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FLOW_ACTION_CT,
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FLOW_ACTION_MPLS_PUSH,
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FLOW_ACTION_MPLS_POP,
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FLOW_ACTION_MPLS_MANGLE,
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NUM_FLOW_ACTIONS,
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};
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/* This is mirroring enum pedit_header_type definition for easy mapping between
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* tc pedit action. Legacy TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK is mapped to
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* FLOW_ACT_MANGLE_UNSPEC, which is supported by no driver.
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*/
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enum flow_action_mangle_base {
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FLOW_ACT_MANGLE_UNSPEC = 0,
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FLOW_ACT_MANGLE_HDR_TYPE_ETH,
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FLOW_ACT_MANGLE_HDR_TYPE_IP4,
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FLOW_ACT_MANGLE_HDR_TYPE_IP6,
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FLOW_ACT_MANGLE_HDR_TYPE_TCP,
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FLOW_ACT_MANGLE_HDR_TYPE_UDP,
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};
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typedef void (*action_destr)(void *priv);
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struct flow_action_cookie {
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u32 cookie_len;
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u8 cookie[];
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};
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struct flow_action_cookie *flow_action_cookie_create(void *data,
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unsigned int len,
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gfp_t gfp);
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void flow_action_cookie_destroy(struct flow_action_cookie *cookie);
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struct flow_action_entry {
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enum flow_action_id id;
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action_destr destructor;
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void *destructor_priv;
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union {
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u32 chain_index; /* FLOW_ACTION_GOTO */
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struct net_device *dev; /* FLOW_ACTION_REDIRECT */
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struct { /* FLOW_ACTION_VLAN */
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u16 vid;
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__be16 proto;
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u8 prio;
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} vlan;
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struct { /* FLOW_ACTION_PACKET_EDIT */
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enum flow_action_mangle_base htype;
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u32 offset;
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u32 mask;
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u32 val;
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} mangle;
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struct ip_tunnel_info *tunnel; /* FLOW_ACTION_TUNNEL_ENCAP */
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u32 csum_flags; /* FLOW_ACTION_CSUM */
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u32 mark; /* FLOW_ACTION_MARK */
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u16 ptype; /* FLOW_ACTION_PTYPE */
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struct { /* FLOW_ACTION_QUEUE */
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u32 ctx;
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u32 index;
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u8 vf;
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} queue;
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struct { /* FLOW_ACTION_SAMPLE */
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struct psample_group *psample_group;
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u32 rate;
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u32 trunc_size;
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bool truncate;
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} sample;
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struct { /* FLOW_ACTION_POLICE */
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s64 burst;
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u64 rate_bytes_ps;
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} police;
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struct { /* FLOW_ACTION_CT */
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int action;
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u16 zone;
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} ct;
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struct { /* FLOW_ACTION_MPLS_PUSH */
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u32 label;
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__be16 proto;
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u8 tc;
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u8 bos;
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u8 ttl;
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} mpls_push;
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struct { /* FLOW_ACTION_MPLS_POP */
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__be16 proto;
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} mpls_pop;
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struct { /* FLOW_ACTION_MPLS_MANGLE */
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u32 label;
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u8 tc;
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u8 bos;
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u8 ttl;
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} mpls_mangle;
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};
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struct flow_action_cookie *cookie; /* user defined action cookie */
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};
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struct flow_action {
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unsigned int num_entries;
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struct flow_action_entry entries[];
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};
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static inline bool flow_action_has_entries(const struct flow_action *action)
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{
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return action->num_entries;
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}
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/**
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* flow_action_has_one_action() - check if exactly one action is present
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* @action: tc filter flow offload action
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*
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* Returns true if exactly one action is present.
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*/
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static inline bool flow_offload_has_one_action(const struct flow_action *action)
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{
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return action->num_entries == 1;
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}
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#define flow_action_for_each(__i, __act, __actions) \
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for (__i = 0, __act = &(__actions)->entries[0]; __i < (__actions)->num_entries; __act = &(__actions)->entries[++__i])
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struct flow_rule {
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struct flow_match match;
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struct flow_action action;
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};
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struct flow_rule *flow_rule_alloc(unsigned int num_actions);
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static inline bool flow_rule_match_key(const struct flow_rule *rule,
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enum flow_dissector_key_id key)
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{
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return dissector_uses_key(rule->match.dissector, key);
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}
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struct flow_stats {
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u64 pkts;
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u64 bytes;
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u64 lastused;
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};
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static inline void flow_stats_update(struct flow_stats *flow_stats,
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u64 bytes, u64 pkts, u64 lastused)
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{
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flow_stats->pkts += pkts;
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flow_stats->bytes += bytes;
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flow_stats->lastused = max_t(u64, flow_stats->lastused, lastused);
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}
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enum flow_block_command {
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FLOW_BLOCK_BIND,
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FLOW_BLOCK_UNBIND,
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};
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enum flow_block_binder_type {
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FLOW_BLOCK_BINDER_TYPE_UNSPEC,
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FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
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FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS,
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};
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struct flow_block {
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struct list_head cb_list;
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};
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struct netlink_ext_ack;
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struct flow_block_offload {
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enum flow_block_command command;
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enum flow_block_binder_type binder_type;
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bool block_shared;
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bool unlocked_driver_cb;
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struct net *net;
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struct flow_block *block;
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struct list_head cb_list;
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struct list_head *driver_block_list;
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struct netlink_ext_ack *extack;
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};
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enum tc_setup_type;
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typedef int flow_setup_cb_t(enum tc_setup_type type, void *type_data,
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void *cb_priv);
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struct flow_block_cb {
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struct list_head driver_list;
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struct list_head list;
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flow_setup_cb_t *cb;
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void *cb_ident;
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void *cb_priv;
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void (*release)(void *cb_priv);
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unsigned int refcnt;
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};
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struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
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void *cb_ident, void *cb_priv,
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void (*release)(void *cb_priv));
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void flow_block_cb_free(struct flow_block_cb *block_cb);
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struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
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flow_setup_cb_t *cb, void *cb_ident);
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void *flow_block_cb_priv(struct flow_block_cb *block_cb);
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void flow_block_cb_incref(struct flow_block_cb *block_cb);
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unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb);
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static inline void flow_block_cb_add(struct flow_block_cb *block_cb,
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struct flow_block_offload *offload)
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{
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list_add_tail(&block_cb->list, &offload->cb_list);
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}
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static inline void flow_block_cb_remove(struct flow_block_cb *block_cb,
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struct flow_block_offload *offload)
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{
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list_move(&block_cb->list, &offload->cb_list);
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}
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bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
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struct list_head *driver_block_list);
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int flow_block_cb_setup_simple(struct flow_block_offload *f,
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struct list_head *driver_list,
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flow_setup_cb_t *cb,
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void *cb_ident, void *cb_priv, bool ingress_only);
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enum flow_cls_command {
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FLOW_CLS_REPLACE,
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FLOW_CLS_DESTROY,
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FLOW_CLS_STATS,
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FLOW_CLS_TMPLT_CREATE,
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FLOW_CLS_TMPLT_DESTROY,
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};
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struct flow_cls_common_offload {
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u32 chain_index;
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__be16 protocol;
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u32 prio;
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struct netlink_ext_ack *extack;
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};
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struct flow_cls_offload {
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struct flow_cls_common_offload common;
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enum flow_cls_command command;
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unsigned long cookie;
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struct flow_rule *rule;
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struct flow_stats stats;
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u32 classid;
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};
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static inline struct flow_rule *
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flow_cls_offload_flow_rule(struct flow_cls_offload *flow_cmd)
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{
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return flow_cmd->rule;
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}
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static inline void flow_block_init(struct flow_block *flow_block)
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{
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INIT_LIST_HEAD(&flow_block->cb_list);
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}
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typedef int flow_indr_block_bind_cb_t(struct net_device *dev, void *cb_priv,
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enum tc_setup_type type, void *type_data);
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typedef void flow_indr_block_cmd_t(struct net_device *dev,
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flow_indr_block_bind_cb_t *cb, void *cb_priv,
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enum flow_block_command command);
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struct flow_indr_block_entry {
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flow_indr_block_cmd_t *cb;
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struct list_head list;
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};
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void flow_indr_add_block_cb(struct flow_indr_block_entry *entry);
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void flow_indr_del_block_cb(struct flow_indr_block_entry *entry);
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int __flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
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flow_indr_block_bind_cb_t *cb,
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void *cb_ident);
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void __flow_indr_block_cb_unregister(struct net_device *dev,
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flow_indr_block_bind_cb_t *cb,
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void *cb_ident);
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int flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
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flow_indr_block_bind_cb_t *cb, void *cb_ident);
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void flow_indr_block_cb_unregister(struct net_device *dev,
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flow_indr_block_bind_cb_t *cb,
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void *cb_ident);
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void flow_indr_block_call(struct net_device *dev,
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struct flow_block_offload *bo,
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enum flow_block_command command);
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#endif /* _NET_FLOW_OFFLOAD_H */
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