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tls: rx: device: add input CoW helper

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Wrap the remaining skb_cow_data() into a helper, so it's easier
to replace down the lane. The new version will change the skb
so make sure relevant pointers get reloaded after the call.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2022-07-22 16:50:32 -07:00
parent 3f92a64e44
commit 8b3c59a7a0
3 changed files with 21 additions and 10 deletions
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1
net/tls/tls.h
View File

@ -127,6 +127,7 @@ int tls_sw_fallback_init(struct sock *sk,
struct tls_offload_context_tx *offload_ctx,
struct tls_crypto_info *crypto_info);
int tls_strp_msg_cow(struct tls_sw_context_rx *ctx);
struct sk_buff *tls_strp_msg_detach(struct tls_sw_context_rx *ctx);
int tls_strp_msg_hold(struct sock *sk, struct sk_buff *skb,
struct sk_buff_head *dst);

19
net/tls/tls_device.c
View File

@ -894,27 +894,26 @@ static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx,
static int
tls_device_reencrypt(struct sock *sk, struct tls_sw_context_rx *sw_ctx)
{
int err = 0, offset, copy, nsg, data_len, pos;
struct sk_buff *skb, *skb_iter, *unused;
int err, offset, copy, data_len, pos;
struct sk_buff *skb, *skb_iter;
struct scatterlist sg[1];
struct strp_msg *rxm;
char *orig_buf, *buf;
skb = tls_strp_msg(sw_ctx);
rxm = strp_msg(skb);
offset = rxm->offset;
rxm = strp_msg(tls_strp_msg(sw_ctx));
orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE +
TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation);
if (!orig_buf)
return -ENOMEM;
buf = orig_buf;
nsg = skb_cow_data(skb, 0, &unused);
if (unlikely(nsg < 0)) {
err = nsg;
err = tls_strp_msg_cow(sw_ctx);
if (unlikely(err))
goto free_buf;
}
skb = tls_strp_msg(sw_ctx);
rxm = strp_msg(skb);
offset = rxm->offset;
sg_init_table(sg, 1);
sg_set_buf(&sg[0], buf,

11
net/tls/tls_strp.c
View File

@ -13,6 +13,17 @@ struct sk_buff *tls_strp_msg_detach(struct tls_sw_context_rx *ctx)
return skb;
}
int tls_strp_msg_cow(struct tls_sw_context_rx *ctx)
{
struct sk_buff *unused;
int nsg;
nsg = skb_cow_data(ctx->recv_pkt, 0, &unused);
if (nsg < 0)
return nsg;
return 0;
}
int tls_strp_msg_hold(struct sock *sk, struct sk_buff *skb,
struct sk_buff_head *dst)
{