esp6: Avoid skb_cow_data whenever possible
This patch tries to avoid skb_cow_data on esp6. On the encrypt side we add the IPsec tailbits to the linear part of the buffer if there is space on it. If there is no space on the linear part, we add a page fragment with the tailbits to the buffer and use separate src and dst scatterlists. On the decrypt side, we leave the buffer as it is if it is not cloned. With this, we can avoid a linearization of the buffer in most of the cases. Joint work with: Sowmini Varadhan <sowmini.varadhan@oracle.com> Ilan Tayari <ilant@mellanox.com> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: Ilan Tayari <ilant@mellanox.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>hifive-unleashed-5.1
Steffen Klassert
parent
cac2661c53
commit
03e2a30f6a
326
net/ipv6/esp6.c
326
net/ipv6/esp6.c
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@ -44,6 +44,8 @@
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#include <net/protocol.h>
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#include <linux/icmpv6.h>
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#include <linux/highmem.h>
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struct esp_skb_cb {
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struct xfrm_skb_cb xfrm;
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void *tmp;
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@ -114,11 +116,40 @@ static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
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__alignof__(struct scatterlist));
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}
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static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
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{
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__be32 *seqhi;
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struct crypto_aead *aead = x->data;
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int seqhilen = 0;
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u8 *iv;
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struct aead_request *req;
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struct scatterlist *sg;
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if (x->props.flags & XFRM_STATE_ESN)
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seqhilen += sizeof(__be32);
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seqhi = esp_tmp_seqhi(tmp);
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iv = esp_tmp_iv(aead, tmp, seqhilen);
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req = esp_tmp_req(aead, iv);
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/* Unref skb_frag_pages in the src scatterlist if necessary.
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* Skip the first sg which comes from skb->data.
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*/
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if (req->src != req->dst)
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for (sg = sg_next(req->src); sg; sg = sg_next(sg))
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put_page(sg_page(sg));
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}
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static void esp_output_done(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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void *tmp;
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struct dst_entry *dst = skb_dst(skb);
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struct xfrm_state *x = dst->xfrm;
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kfree(ESP_SKB_CB(skb)->tmp);
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tmp = ESP_SKB_CB(skb)->tmp;
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esp_ssg_unref(x, tmp);
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kfree(tmp);
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xfrm_output_resume(skb, err);
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}
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@ -138,6 +169,27 @@ static void esp_output_restore_header(struct sk_buff *skb)
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esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
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}
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static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
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struct ip_esp_hdr *esph,
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__be32 *seqhi)
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{
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struct xfrm_state *x = skb_dst(skb)->xfrm;
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/* For ESN we move the header forward by 4 bytes to
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* accomodate the high bits. We will move it back after
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* encryption.
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*/
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if ((x->props.flags & XFRM_STATE_ESN)) {
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esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
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*seqhi = esph->spi;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
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}
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esph->spi = x->id.spi;
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return esph;
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}
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static void esp_output_done_esn(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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@ -152,8 +204,9 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
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struct ip_esp_hdr *esph;
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struct crypto_aead *aead;
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struct aead_request *req;
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struct scatterlist *sg;
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struct scatterlist *sg, *dsg;
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struct sk_buff *trailer;
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struct page *page;
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void *tmp;
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int blksize;
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int clen;
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@ -164,10 +217,13 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
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int nfrags;
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int assoclen;
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int seqhilen;
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int tailen;
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u8 *iv;
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u8 *tail;
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u8 *vaddr;
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__be32 *seqhi;
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__be64 seqno;
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__u8 proto = *skb_mac_header(skb);
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/* skb is pure payload to encrypt */
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aead = x->data;
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@ -186,11 +242,7 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
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blksize = ALIGN(crypto_aead_blocksize(aead), 4);
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clen = ALIGN(skb->len + 2 + tfclen, blksize);
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plen = clen - skb->len - tfclen;
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err = skb_cow_data(skb, tfclen + plen + alen, &trailer);
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if (err < 0)
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goto error;
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nfrags = err;
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tailen = tfclen + plen + alen;
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assoclen = sizeof(*esph);
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seqhilen = 0;
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@ -200,6 +252,148 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
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assoclen += seqhilen;
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}
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*skb_mac_header(skb) = IPPROTO_ESP;
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esph = ip_esp_hdr(skb);
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if (!skb_cloned(skb)) {
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if (tailen <= skb_availroom(skb)) {
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nfrags = 1;
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trailer = skb;
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tail = skb_tail_pointer(trailer);
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goto skip_cow;
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} else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
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&& !skb_has_frag_list(skb)) {
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int allocsize;
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struct sock *sk = skb->sk;
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struct page_frag *pfrag = &x->xfrag;
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allocsize = ALIGN(tailen, L1_CACHE_BYTES);
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spin_lock_bh(&x->lock);
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if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
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spin_unlock_bh(&x->lock);
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goto cow;
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}
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page = pfrag->page;
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get_page(page);
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vaddr = kmap_atomic(page);
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tail = vaddr + pfrag->offset;
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/* Fill padding... */
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if (tfclen) {
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memset(tail, 0, tfclen);
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tail += tfclen;
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}
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do {
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int i;
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for (i = 0; i < plen - 2; i++)
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tail[i] = i + 1;
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} while (0);
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tail[plen - 2] = plen - 2;
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tail[plen - 1] = proto;
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kunmap_atomic(vaddr);
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nfrags = skb_shinfo(skb)->nr_frags;
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__skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
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tailen);
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skb_shinfo(skb)->nr_frags = ++nfrags;
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pfrag->offset = pfrag->offset + allocsize;
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nfrags++;
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skb->len += tailen;
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skb->data_len += tailen;
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skb->truesize += tailen;
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if (sk)
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atomic_add(tailen, &sk->sk_wmem_alloc);
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skb_push(skb, -skb_network_offset(skb));
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
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esph->spi = x->id.spi;
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tmp = esp_alloc_tmp(aead, nfrags + 2, seqhilen);
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if (!tmp) {
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spin_unlock_bh(&x->lock);
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err = -ENOMEM;
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goto error;
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}
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seqhi = esp_tmp_seqhi(tmp);
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iv = esp_tmp_iv(aead, tmp, seqhilen);
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req = esp_tmp_req(aead, iv);
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sg = esp_req_sg(aead, req);
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dsg = &sg[nfrags];
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esph = esp_output_set_esn(skb, esph, seqhi);
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg,
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(unsigned char *)esph - skb->data,
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assoclen + ivlen + clen + alen);
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allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
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if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
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spin_unlock_bh(&x->lock);
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err = -ENOMEM;
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goto error;
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}
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skb_shinfo(skb)->nr_frags = 1;
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page = pfrag->page;
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get_page(page);
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/* replace page frags in skb with new page */
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__skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
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pfrag->offset = pfrag->offset + allocsize;
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sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
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skb_to_sgvec(skb, dsg,
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(unsigned char *)esph - skb->data,
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assoclen + ivlen + clen + alen);
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spin_unlock_bh(&x->lock);
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goto skip_cow2;
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}
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}
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cow:
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err = skb_cow_data(skb, tailen, &trailer);
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if (err < 0)
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goto error;
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nfrags = err;
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tail = skb_tail_pointer(trailer);
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esph = ip_esp_hdr(skb);
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skip_cow:
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/* Fill padding... */
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if (tfclen) {
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memset(tail, 0, tfclen);
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tail += tfclen;
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}
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do {
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int i;
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for (i = 0; i < plen - 2; i++)
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tail[i] = i + 1;
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} while (0);
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tail[plen - 2] = plen - 2;
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tail[plen - 1] = proto;
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pskb_put(skb, trailer, clen - skb->len + alen);
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skb_push(skb, -skb_network_offset(skb));
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
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esph->spi = x->id.spi;
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tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
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if (!tmp) {
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err = -ENOMEM;
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@ -210,49 +404,22 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
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iv = esp_tmp_iv(aead, tmp, seqhilen);
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req = esp_tmp_req(aead, iv);
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sg = esp_req_sg(aead, req);
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dsg = sg;
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/* Fill padding... */
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tail = skb_tail_pointer(trailer);
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if (tfclen) {
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memset(tail, 0, tfclen);
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tail += tfclen;
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}
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do {
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int i;
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for (i = 0; i < plen - 2; i++)
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tail[i] = i + 1;
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} while (0);
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tail[plen - 2] = plen - 2;
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tail[plen - 1] = *skb_mac_header(skb);
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pskb_put(skb, trailer, clen - skb->len + alen);
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skb_push(skb, -skb_network_offset(skb));
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esph = ip_esp_hdr(skb);
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*skb_mac_header(skb) = IPPROTO_ESP;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
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aead_request_set_callback(req, 0, esp_output_done, skb);
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/* For ESN we move the header forward by 4 bytes to
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* accomodate the high bits. We will move it back after
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* encryption.
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*/
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if ((x->props.flags & XFRM_STATE_ESN)) {
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esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
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*seqhi = esph->spi;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
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aead_request_set_callback(req, 0, esp_output_done_esn, skb);
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}
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esph->spi = x->id.spi;
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esph = esp_output_set_esn(skb, esph, seqhi);
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg,
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(unsigned char *)esph - skb->data,
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assoclen + ivlen + clen + alen);
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aead_request_set_crypt(req, sg, sg, ivlen + clen, iv);
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skip_cow2:
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if ((x->props.flags & XFRM_STATE_ESN))
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aead_request_set_callback(req, 0, esp_output_done_esn, skb);
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else
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aead_request_set_callback(req, 0, esp_output_done, skb);
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aead_request_set_crypt(req, sg, dsg, ivlen + clen, iv);
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aead_request_set_ad(req, assoclen);
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seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
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@ -278,6 +445,8 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
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esp_output_restore_header(skb);
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}
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if (sg != dsg)
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esp_ssg_unref(x, tmp);
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kfree(tmp);
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error:
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@ -343,6 +512,23 @@ static void esp_input_restore_header(struct sk_buff *skb)
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__skb_pull(skb, 4);
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}
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static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
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{
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struct xfrm_state *x = xfrm_input_state(skb);
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struct ip_esp_hdr *esph = (struct ip_esp_hdr *)skb->data;
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/* For ESN we move the header forward by 4 bytes to
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* accomodate the high bits. We will move it back after
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* decryption.
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*/
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if ((x->props.flags & XFRM_STATE_ESN)) {
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esph = (void *)skb_push(skb, 4);
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*seqhi = esph->spi;
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esph->spi = esph->seq_no;
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esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
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}
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}
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static void esp_input_done_esn(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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@ -378,14 +564,6 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
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goto out;
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}
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nfrags = skb_cow_data(skb, 0, &trailer);
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if (nfrags < 0) {
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ret = -EINVAL;
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goto out;
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}
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ret = -ENOMEM;
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assoclen = sizeof(*esph);
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seqhilen = 0;
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@ -394,6 +572,27 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
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assoclen += seqhilen;
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}
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if (!skb_cloned(skb)) {
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if (!skb_is_nonlinear(skb)) {
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nfrags = 1;
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goto skip_cow;
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} else if (!skb_has_frag_list(skb)) {
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nfrags = skb_shinfo(skb)->nr_frags;
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nfrags++;
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goto skip_cow;
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}
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}
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nfrags = skb_cow_data(skb, 0, &trailer);
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if (nfrags < 0) {
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ret = -EINVAL;
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goto out;
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}
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skip_cow:
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ret = -ENOMEM;
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tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
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if (!tmp)
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goto out;
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@ -404,27 +603,18 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
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req = esp_tmp_req(aead, iv);
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sg = esp_req_sg(aead, req);
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skb->ip_summed = CHECKSUM_NONE;
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esph = (struct ip_esp_hdr *)skb->data;
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aead_request_set_callback(req, 0, esp_input_done, skb);
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/* For ESN we move the header forward by 4 bytes to
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* accomodate the high bits. We will move it back after
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* decryption.
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*/
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if ((x->props.flags & XFRM_STATE_ESN)) {
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esph = (void *)skb_push(skb, 4);
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*seqhi = esph->spi;
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esph->spi = esph->seq_no;
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esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
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aead_request_set_callback(req, 0, esp_input_done_esn, skb);
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}
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esp_input_set_header(skb, seqhi);
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg, 0, skb->len);
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skb->ip_summed = CHECKSUM_NONE;
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if ((x->props.flags & XFRM_STATE_ESN))
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aead_request_set_callback(req, 0, esp_input_done_esn, skb);
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else
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aead_request_set_callback(req, 0, esp_input_done, skb);
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aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
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aead_request_set_ad(req, assoclen);
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