[PATCH net-next 3/6] flow_dissector: constify raw input @data argument
From: Alexander Lobakin <hidden>
Date: 2021-03-12 19:47:42
Also in:
bpf, lkml
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Flow Dissector code never modifies the input buffer, neither skb nor raw data. Make @data argument const for all of the Flow dissector's functions. Signed-off-by: Alexander Lobakin <redacted> --- include/linux/skbuff.h | 15 ++++++------- include/net/flow_dissector.h | 2 +- net/core/flow_dissector.c | 41 +++++++++++++++++++----------------- 3 files changed, 30 insertions(+), 28 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index d93ab74063e5..7873f24c0ae5 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h@@ -1292,10 +1292,10 @@ __skb_set_sw_hash(struct sk_buff *skb, __u32 hash, bool is_l4) void __skb_get_hash(struct sk_buff *skb); u32 __skb_get_hash_symmetric(const struct sk_buff *skb); u32 skb_get_poff(const struct sk_buff *skb); -u32 __skb_get_poff(const struct sk_buff *skb, void *data, +u32 __skb_get_poff(const struct sk_buff *skb, const void *data, const struct flow_keys_basic *keys, int hlen); __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, - void *data, int hlen_proto); + const void *data, int hlen_proto); static inline __be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto)
@@ -1314,9 +1314,8 @@ bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx, 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); + void *target_container, const void *data, + __be16 proto, int nhoff, int hlen, unsigned int flags); static inline bool skb_flow_dissect(const struct sk_buff *skb, struct flow_dissector *flow_dissector,
@@ -1338,9 +1337,9 @@ static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb, static inline bool skb_flow_dissect_flow_keys_basic(const struct net *net, const struct sk_buff *skb, - struct flow_keys_basic *flow, void *data, - __be16 proto, int nhoff, int hlen, - unsigned int flags) + struct flow_keys_basic *flow, + const void *data, __be16 proto, + int nhoff, int hlen, unsigned int flags) { memset(flow, 0, sizeof(*flow)); return __skb_flow_dissect(net, skb, &flow_keys_basic_dissector, flow,
diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index bf00e71816ed..ffd386ea0dbb 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h@@ -350,7 +350,7 @@ static inline bool flow_keys_have_l4(const struct flow_keys *keys) u32 flow_hash_from_keys(struct flow_keys *keys); void skb_flow_get_icmp_tci(const struct sk_buff *skb, struct flow_dissector_key_icmp *key_icmp, - void *data, int thoff, int hlen); + const void *data, int thoff, int hlen); static inline bool dissector_uses_key(const struct flow_dissector *flow_dissector, enum flow_dissector_key_id key_id)
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 2ef2224b3bff..2ed380d096ce 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c@@ -114,7 +114,7 @@ int flow_dissector_bpf_prog_attach_check(struct net *net, * is the protocol port offset returned from proto_ports_offset */ __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, - void *data, int hlen) + const void *data, int hlen) { int poff = proto_ports_offset(ip_proto);
@@ -161,7 +161,7 @@ static bool icmp_has_id(u8 type) */ void skb_flow_get_icmp_tci(const struct sk_buff *skb, struct flow_dissector_key_icmp *key_icmp, - void *data, int thoff, int hlen) + const void *data, int thoff, int hlen) { struct icmphdr *ih, _ih;
@@ -187,8 +187,8 @@ EXPORT_SYMBOL(skb_flow_get_icmp_tci); */ static void __skb_flow_dissect_icmp(const struct sk_buff *skb, struct flow_dissector *flow_dissector, - void *target_container, - void *data, int thoff, int hlen) + void *target_container, const void *data, + int thoff, int hlen) { struct flow_dissector_key_icmp *key_icmp;
@@ -409,8 +409,8 @@ EXPORT_SYMBOL(skb_flow_dissect_hash); static enum flow_dissect_ret __skb_flow_dissect_mpls(const struct sk_buff *skb, struct flow_dissector *flow_dissector, - void *target_container, void *data, int nhoff, int hlen, - int lse_index, bool *entropy_label) + void *target_container, const void *data, int nhoff, + int hlen, int lse_index, bool *entropy_label) { struct mpls_label *hdr, _hdr; u32 entry, label, bos;
@@ -467,7 +467,8 @@ __skb_flow_dissect_mpls(const struct sk_buff *skb, static enum flow_dissect_ret __skb_flow_dissect_arp(const struct sk_buff *skb, struct flow_dissector *flow_dissector, - void *target_container, void *data, int nhoff, int hlen) + void *target_container, const void *data, + int nhoff, int hlen) { struct flow_dissector_key_arp *key_arp; struct {
@@ -523,7 +524,7 @@ 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, + void *target_container, const void *data, __be16 *p_proto, int *p_nhoff, int *p_hlen, unsigned int flags) {
@@ -663,8 +664,8 @@ __skb_flow_dissect_gre(const struct sk_buff *skb, 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) + const void *data, __be16 *p_proto, int *p_nhoff, + int hlen, unsigned int flags) { struct { struct batadv_unicast_packet batadv_unicast;
@@ -695,7 +696,8 @@ __skb_flow_dissect_batadv(const struct sk_buff *skb, 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) + void *target_container, const void *data, + int thoff, int hlen) { struct flow_dissector_key_tcp *key_tcp; struct tcphdr *th, _th;
@@ -719,8 +721,8 @@ __skb_flow_dissect_tcp(const struct sk_buff *skb, static void __skb_flow_dissect_ports(const struct sk_buff *skb, struct flow_dissector *flow_dissector, - void *target_container, void *data, int nhoff, - u8 ip_proto, int hlen) + void *target_container, const void *data, + int nhoff, u8 ip_proto, int hlen) { enum flow_dissector_key_id dissector_ports = FLOW_DISSECTOR_KEY_MAX; struct flow_dissector_key_ports *key_ports;
@@ -744,7 +746,8 @@ __skb_flow_dissect_ports(const struct sk_buff *skb, 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) + void *target_container, const void *data, + const struct iphdr *iph) { struct flow_dissector_key_ip *key_ip;
@@ -761,7 +764,8 @@ __skb_flow_dissect_ipv4(const struct sk_buff *skb, 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) + void *target_container, const void *data, + const struct ipv6hdr *iph) { struct flow_dissector_key_ip *key_ip;
@@ -908,9 +912,8 @@ bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx, 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) + void *target_container, const 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;
@@ -1642,7 +1645,7 @@ __u32 skb_get_hash_perturb(const struct sk_buff *skb, } EXPORT_SYMBOL(skb_get_hash_perturb); -u32 __skb_get_poff(const struct sk_buff *skb, void *data, +u32 __skb_get_poff(const struct sk_buff *skb, const void *data, const struct flow_keys_basic *keys, int hlen) { u32 poff = keys->control.thoff; --
2.30.2