net/sunrpc/auth_gss/svcauth_gss.c

Source file repositories/reference/linux-study-clean/net/sunrpc/auth_gss/svcauth_gss.c

File Facts

System
Linux kernel
Corpus path
net/sunrpc/auth_gss/svcauth_gss.c
Extension
.c
Size
52366 bytes
Lines
2127
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct gss_svc_data {
	/* decoded gss client cred: */
	struct rpc_gss_wire_cred	clcred;
	u32				gsd_databody_offset;
	struct rsc			*rsci;

	/* for temporary results */
	__be32				gsd_seq_num;
	u8				gsd_scratch[GSS_SCRATCH_SIZE];
};

/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
 * into replies.
 *
 * Key is context handle (\x if empty) and gss_token.
 * Content is major_status minor_status (integers) context_handle, reply_token.
 *
 */

static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
{
	return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
}

#define	RSI_HASHBITS	6
#define	RSI_HASHMAX	(1<<RSI_HASHBITS)

struct rsi {
	struct cache_head	h;
	struct xdr_netobj	in_handle, in_token;
	struct xdr_netobj	out_handle, out_token;
	int			major_status, minor_status;
	struct rcu_head		rcu_head;
};

static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);

static void rsi_free(struct rsi *rsii)
{
	kfree(rsii->in_handle.data);
	kfree(rsii->in_token.data);
	kfree(rsii->out_handle.data);
	kfree(rsii->out_token.data);
}

static void rsi_free_rcu(struct rcu_head *head)
{
	struct rsi *rsii = container_of(head, struct rsi, rcu_head);

	rsi_free(rsii);
	kfree(rsii);
}

static void rsi_put(struct kref *ref)
{
	struct rsi *rsii = container_of(ref, struct rsi, h.ref);

	call_rcu(&rsii->rcu_head, rsi_free_rcu);
}

static inline int rsi_hash(struct rsi *item)
{
	return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
	     ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
}

static int rsi_match(struct cache_head *a, struct cache_head *b)
{
	struct rsi *item = container_of(a, struct rsi, h);
	struct rsi *tmp = container_of(b, struct rsi, h);
	return netobj_equal(&item->in_handle, &tmp->in_handle) &&
	       netobj_equal(&item->in_token, &tmp->in_token);
}

static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
{
	dst->len = len;
	dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
	if (len && !dst->data)
		return -ENOMEM;
	return 0;
}

static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
{
	return dup_to_netobj(dst, src->data, src->len);
}

static void rsi_init(struct cache_head *cnew, struct cache_head *citem)

Annotation

Implementation Notes