net/tls/tls_sw.c

Source file repositories/reference/linux-study-clean/net/tls/tls_sw.c

File Facts

System
Linux kernel
Corpus path
net/tls/tls_sw.c
Extension
.c
Size
67287 bytes
Lines
2626
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source 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 tls_decrypt_arg {
	struct_group(inargs,
	bool zc;
	bool async;
	bool async_done;
	u8 tail;
	);

	struct sk_buff *skb;
};

struct tls_decrypt_ctx {
	struct sock *sk;
	u8 iv[TLS_MAX_IV_SIZE];
	u8 aad[TLS_MAX_AAD_SIZE];
	u8 tail;
	bool free_sgout;
	struct scatterlist sg[];
};

noinline void tls_err_abort(struct sock *sk, int err)
{
	WARN_ON_ONCE(err >= 0);
	/* sk->sk_err should contain a positive error code. */
	WRITE_ONCE(sk->sk_err, -err);
	/* Paired with smp_rmb() in tcp_poll() */
	smp_wmb();
	sk_error_report(sk);
}

static int __skb_nsg(struct sk_buff *skb, int offset, int len,
                     unsigned int recursion_level)
{
        int start = skb_headlen(skb);
        int i, chunk = start - offset;
        struct sk_buff *frag_iter;
        int elt = 0;

        if (unlikely(recursion_level >= 24))
                return -EMSGSIZE;

        if (chunk > 0) {
                if (chunk > len)
                        chunk = len;
                elt++;
                len -= chunk;
                if (len == 0)
                        return elt;
                offset += chunk;
        }

        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                int end;

                WARN_ON(start > offset + len);

                end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]);
                chunk = end - offset;
                if (chunk > 0) {
                        if (chunk > len)
                                chunk = len;
                        elt++;
                        len -= chunk;
                        if (len == 0)
                                return elt;
                        offset += chunk;
                }
                start = end;
        }

        if (unlikely(skb_has_frag_list(skb))) {
                skb_walk_frags(skb, frag_iter) {
                        int end, ret;

                        WARN_ON(start > offset + len);

                        end = start + frag_iter->len;
                        chunk = end - offset;
                        if (chunk > 0) {
                                if (chunk > len)
                                        chunk = len;
                                ret = __skb_nsg(frag_iter, offset - start, chunk,
                                                recursion_level + 1);
                                if (unlikely(ret < 0))
                                        return ret;
                                elt += ret;
                                len -= chunk;
                                if (len == 0)
                                        return elt;
                                offset += chunk;

Annotation

Implementation Notes