/* * linux/net/sunrpc/socklib.c * * Common socket helper routines for RPC client and server * * Copyright (C) 1995, 1996 Olaf Kirch */ #include #include #include #include #include #include #include #include #include /** * xdr_skb_read_bits - copy some data bits from skb to internal buffer * @desc: sk_buff copy helper * @to: copy destination * @len: number of bytes to copy * * Possibly called several times to iterate over an sk_buff and copy * data out of it. */ size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len) { if (len > desc->count) len = desc->count; if (unlikely(skb_copy_bits(desc->skb, desc->offset, to, len))) return 0; desc->count -= len; desc->offset += len; return len; } EXPORT_SYMBOL_GPL(xdr_skb_read_bits); /** * xdr_skb_read_and_csum_bits - copy and checksum from skb to buffer * @desc: sk_buff copy helper * @to: copy destination * @len: number of bytes to copy * * Same as skb_read_bits, but calculate a checksum at the same time. */ static size_t xdr_skb_read_and_csum_bits(struct xdr_skb_reader *desc, void *to, size_t len) { unsigned int pos; __wsum csum2; if (len > desc->count) len = desc->count; pos = desc->offset; csum2 = skb_copy_and_csum_bits(desc->skb, pos, to, len, 0); desc->csum = csum_block_add(desc->csum, csum2, pos); desc->count -= len; desc->offset += len; return len; } /** * xdr_partial_copy_from_skb - copy data out of an skb * @xdr: target XDR buffer * @base: starting offset * @desc: sk_buff copy helper * @copy_actor: virtual method for copying data * */ ssize_t xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base, struct xdr_skb_reader *desc, xdr_skb_read_actor copy_actor) { struct page **ppage = xdr->pages; unsigned int len, pglen = xdr->page_len; ssize_t copied = 0; size_t ret; len = xdr->head[0].iov_len; if (base < len) { len -= base; ret = copy_actor(desc, (char *)xdr->head[0].iov_base + base, len); copied += ret; if (ret != len || !desc->count) goto out; base = 0; } else base -= len; if (unlikely(pglen == 0)) goto copy_tail; if (unlikely(base >= pglen)) { base -= pglen; goto copy_tail; } if (base || xdr->page_base) { pglen -= base; base += xdr->page_base; ppage += base >> PAGE_SHIFT; base &= ~PAGE_MASK; } do { char *kaddr; /* ACL likes to be lazy in allocating pages - ACLs * are small by default but can get huge. */ if (unlikely(*ppage == NULL)) { *ppage = alloc_page(GFP_ATOMIC); if (unlikely(*ppage == NULL)) { if (copied == 0) copied = -ENOMEM; goto out; } } len = PAGE_SIZE; kaddr = kmap_atomic(*ppage); if (base) { len -= base; if (pglen < len) len = pglen; ret = copy_actor(desc, kaddr + base, len); base = 0; } else { if (pglen < len) len = pglen; ret = copy_actor(desc, kaddr, len); } flush_dcache_page(*ppage); kunmap_atomic(kaddr); copied += ret; if (ret != len || !desc->count) goto out; ppage++; } while ((pglen -= len) != 0); copy_tail: len = xdr->tail[0].iov_len; if (base < len) copied += copy_actor(desc, (char *)xdr->tail[0].iov_base + base, len - base); out: return copied; } EXPORT_SYMBOL_GPL(xdr_partial_copy_from_skb); /** * csum_partial_copy_to_xdr - checksum and copy data * @xdr: target XDR buffer * @skb: source skb * * We have set things up such that we perform the checksum of the UDP * packet in parallel with the copies into the RPC client iovec. -DaveM */ int csum_partial_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) { struct xdr_skb_reader desc; desc.skb = skb; desc.offset = 0; desc.count = skb->len - desc.offset; if (skb_csum_unnecessary(skb)) goto no_checksum; desc.csum = csum_partial(skb->data, desc.offset, skb->csum); if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_and_csum_bits) < 0) return -1; if (desc.offset != skb->len) { __wsum csum2; csum2 = skb_checksum(skb, desc.offset, skb->len - desc.offset, 0); desc.csum = csum_block_add(desc.csum, csum2, desc.offset); } if (desc.count) return -1; if (csum_fold(desc.csum)) return -1; if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && !skb->csum_complete_sw) netdev_rx_csum_fault(skb->dev); return 0; no_checksum: if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) return -1; if (desc.count) return -1; return 0; } EXPORT_SYMBOL_GPL(csum_partial_copy_to_xdr); ad'/>
authorLinus Torvalds <torvalds@linux-foundation.org>2017-02-06 14:16:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-06 14:16:23 -0800
commit396bf4cd835e62d70fad4a03a8963e61f19021f2 (patch)
tree79ac8f33554260fea1a8d43e6f8c4c5460115f45 /tools/perf/ui/browser.c
parentd5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c (diff)
parent7c2cf1c4615cc2f576d0604406cdf0065f00b83b (diff)
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto fixes from Herbert Xu: - use-after-free in algif_aead - modular aesni regression when pcbc is modular but absent - bug causing IO page faults in ccp - double list add in ccp - NULL pointer dereference in qat (two patches) - panic in chcr - NULL pointer dereference in chcr - out-of-bound access in chcr * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: chcr - Fix key length for RFC4106 crypto: algif_aead - Fix kernel panic on list_del crypto: aesni - Fix failure when pcbc module is absent crypto: ccp - Fix double add when creating new DMA command crypto: ccp - Fix DMA operations when IOMMU is enabled crypto: chcr - Check device is allocated before use crypto: chcr - Fix panic on dma_unmap_sg crypto: qat - zero esram only for DH85x devices crypto: qat - fix bar discovery for c62x
Diffstat (limited to 'tools/perf/ui/browser.c')