Currently, with only one base and dependency stored this is superfluous,
but it will become more useful when the next commit adds support for
storing a payload for every base.
Signed-off-by: Jeremy Sowden <jeremy@xxxxxxxxxx>
---
include/payload.h | 2 ++
src/netlink_delinearize.c | 4 +++-
src/payload.c | 31 +++++++++++++++++++++++++++----
3 files changed, 32 insertions(+), 5 deletions(-)
diff --git a/include/payload.h b/include/payload.h
index 8bc3fb9a8a54..10ae9fe4f9c5 100644
--- a/include/payload.h
+++ b/include/payload.h
@@ -47,6 +47,8 @@ extern void payload_dependency_store(struct payload_dep_ctx *ctx,
enum proto_bases base);
extern bool payload_dependency_exists(const struct payload_dep_ctx *ctx,
enum proto_bases base);
+extern struct stmt *payload_dependency_get(struct payload_dep_ctx *ctx,
+ enum proto_bases base);
extern void payload_dependency_release(struct payload_dep_ctx *ctx);
extern void payload_dependency_kill(struct payload_dep_ctx *ctx,
struct expr *expr, unsigned int family);
diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c
index fd81e07151c2..2a62b309be1d 100644
--- a/src/netlink_delinearize.c
+++ b/src/netlink_delinearize.c
@@ -2060,11 +2060,13 @@ static bool meta_may_dependency_kill(struct payload_dep_ctx *ctx,
const struct expr *expr)
{
uint8_t l4proto, nfproto = NFPROTO_UNSPEC;
- struct expr *dep = ctx->pdep->expr;
+ struct expr *dep;
if (ctx->pbase != PROTO_BASE_NETWORK_HDR)
return true;
+ dep = payload_dependency_get(ctx, PROTO_BASE_NETWORK_HDR)->expr;
+
if (__meta_dependency_may_kill(dep, &nfproto))
return true;
diff --git a/src/payload.c b/src/payload.c
index 576eb149f71d..902b318ae23a 100644
--- a/src/payload.c
+++ b/src/payload.c
@@ -631,6 +631,27 @@ bool payload_dependency_exists(const struct payload_dep_ctx *ctx,
(ctx->pbase == base || (base == PROTO_BASE_TRANSPORT_HDR && ctx->pbase == base + 1));
}
+/**
+ * payload_dependency_get - return a payload dependency if available
+ * @ctx: payload dependency context
+ * @base: payload protocol base
+ *
+ * If we have seen a protocol key payload expression for this base, we return
+ * it.
+ */
+struct stmt *payload_dependency_get(struct payload_dep_ctx *ctx,
+ enum proto_bases base)
+{
+ if (ctx->pbase == base)
+ return ctx->pdep;
+
+ if (base == PROTO_BASE_TRANSPORT_HDR &&
+ ctx->pbase == PROTO_BASE_INNER_HDR)
+ return ctx->pdep;
+
+ return NULL;
+}
+
void payload_dependency_release(struct payload_dep_ctx *ctx)
{
list_del(&ctx->pdep->list);
@@ -661,7 +682,7 @@ static uint8_t icmp_dep_to_type(enum icmp_hdr_field_type t)
static bool payload_may_dependency_kill_icmp(struct payload_dep_ctx *ctx, struct expr *expr)
{
- const struct expr *dep = ctx->pdep->expr;
+ const struct expr *dep = payload_dependency_get(ctx, expr->payload.base)->expr;
uint8_t icmp_type;
icmp_type = expr->payload.tmpl->icmp_dep;
@@ -678,9 +699,11 @@ static bool payload_may_dependency_kill_icmp(struct payload_dep_ctx *ctx, struct
static bool payload_may_dependency_kill_ll(struct payload_dep_ctx *ctx, struct expr *expr)
{
- const struct expr *dep = ctx->pdep->expr;
+ const struct expr *dep = payload_dependency_get(ctx, expr->payload.base)->expr;
- /* Never remove a 'vlan type 0x...' expression, they are never added implicitly */
+ /* Never remove a 'vlan type 0x...' expression, they are never added
+ * implicitly
+ */
if (dep->left->payload.desc == &proto_vlan)
return false;
@@ -697,7 +720,7 @@ static bool payload_may_dependency_kill_ll(struct payload_dep_ctx *ctx, struct e
static bool payload_may_dependency_kill(struct payload_dep_ctx *ctx,
unsigned int family, struct expr *expr)
{
- struct expr *dep = ctx->pdep->expr;
+ struct expr *dep = payload_dependency_get(ctx, expr->payload.base)->expr;
/* Protocol key payload expression at network base such as 'ip6 nexthdr'
* need to be left in place since it implicitly restricts matching to
--
2.34.1
