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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/xfrm/xfrm_algo.c
downloadkernel-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/xfrm/xfrm_algo.c')
-rw-r--r--net/xfrm/xfrm_algo.c729
1 files changed, 729 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
new file mode 100644
index 000000000000..080aae243ce0
--- /dev/null
+++ b/net/xfrm/xfrm_algo.c
@@ -0,0 +1,729 @@
+/*
+ * xfrm algorithm interface
+ *
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pfkeyv2.h>
+#include <linux/crypto.h>
+#include <net/xfrm.h>
+#if defined(CONFIG_INET_AH) || defined(CONFIG_INET_AH_MODULE) || defined(CONFIG_INET6_AH) || defined(CONFIG_INET6_AH_MODULE)
+#include <net/ah.h>
+#endif
+#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
+#include <net/esp.h>
+#endif
+#include <asm/scatterlist.h>
+
+/*
+ * Algorithms supported by IPsec. These entries contain properties which
+ * are used in key negotiation and xfrm processing, and are used to verify
+ * that instantiated crypto transforms have correct parameters for IPsec
+ * purposes.
+ */
+static struct xfrm_algo_desc aalg_list[] = {
+{
+ .name = "digest_null",
+
+ .uinfo = {
+ .auth = {
+ .icv_truncbits = 0,
+ .icv_fullbits = 0,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_AALG_NULL,
+ .sadb_alg_ivlen = 0,
+ .sadb_alg_minbits = 0,
+ .sadb_alg_maxbits = 0
+ }
+},
+{
+ .name = "md5",
+
+ .uinfo = {
+ .auth = {
+ .icv_truncbits = 96,
+ .icv_fullbits = 128,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_AALG_MD5HMAC,
+ .sadb_alg_ivlen = 0,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 128
+ }
+},
+{
+ .name = "sha1",
+
+ .uinfo = {
+ .auth = {
+ .icv_truncbits = 96,
+ .icv_fullbits = 160,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_AALG_SHA1HMAC,
+ .sadb_alg_ivlen = 0,
+ .sadb_alg_minbits = 160,
+ .sadb_alg_maxbits = 160
+ }
+},
+{
+ .name = "sha256",
+
+ .uinfo = {
+ .auth = {
+ .icv_truncbits = 96,
+ .icv_fullbits = 256,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_AALG_SHA2_256HMAC,
+ .sadb_alg_ivlen = 0,
+ .sadb_alg_minbits = 256,
+ .sadb_alg_maxbits = 256
+ }
+},
+{
+ .name = "ripemd160",
+
+ .uinfo = {
+ .auth = {
+ .icv_truncbits = 96,
+ .icv_fullbits = 160,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_AALG_RIPEMD160HMAC,
+ .sadb_alg_ivlen = 0,
+ .sadb_alg_minbits = 160,
+ .sadb_alg_maxbits = 160
+ }
+},
+};
+
+static struct xfrm_algo_desc ealg_list[] = {
+{
+ .name = "cipher_null",
+
+ .uinfo = {
+ .encr = {
+ .blockbits = 8,
+ .defkeybits = 0,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_EALG_NULL,
+ .sadb_alg_ivlen = 0,
+ .sadb_alg_minbits = 0,
+ .sadb_alg_maxbits = 0
+ }
+},
+{
+ .name = "des",
+
+ .uinfo = {
+ .encr = {
+ .blockbits = 64,
+ .defkeybits = 64,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_EALG_DESCBC,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 64,
+ .sadb_alg_maxbits = 64
+ }
+},
+{
+ .name = "des3_ede",
+
+ .uinfo = {
+ .encr = {
+ .blockbits = 64,
+ .defkeybits = 192,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_EALG_3DESCBC,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 192,
+ .sadb_alg_maxbits = 192
+ }
+},
+{
+ .name = "cast128",
+
+ .uinfo = {
+ .encr = {
+ .blockbits = 64,
+ .defkeybits = 128,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_CASTCBC,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 40,
+ .sadb_alg_maxbits = 128
+ }
+},
+{
+ .name = "blowfish",
+
+ .uinfo = {
+ .encr = {
+ .blockbits = 64,
+ .defkeybits = 128,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_BLOWFISHCBC,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 40,
+ .sadb_alg_maxbits = 448
+ }
+},
+{
+ .name = "aes",
+
+ .uinfo = {
+ .encr = {
+ .blockbits = 128,
+ .defkeybits = 128,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_AESCBC,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 256
+ }
+},
+{
+ .name = "serpent",
+
+ .uinfo = {
+ .encr = {
+ .blockbits = 128,
+ .defkeybits = 128,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_SERPENTCBC,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 256,
+ }
+},
+{
+ .name = "twofish",
+
+ .uinfo = {
+ .encr = {
+ .blockbits = 128,
+ .defkeybits = 128,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_TWOFISHCBC,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 256
+ }
+},
+};
+
+static struct xfrm_algo_desc calg_list[] = {
+{
+ .name = "deflate",
+ .uinfo = {
+ .comp = {
+ .threshold = 90,
+ }
+ },
+ .desc = { .sadb_alg_id = SADB_X_CALG_DEFLATE }
+},
+{
+ .name = "lzs",
+ .uinfo = {
+ .comp = {
+ .threshold = 90,
+ }
+ },
+ .desc = { .sadb_alg_id = SADB_X_CALG_LZS }
+},
+{
+ .name = "lzjh",
+ .uinfo = {
+ .comp = {
+ .threshold = 50,
+ }
+ },
+ .desc = { .sadb_alg_id = SADB_X_CALG_LZJH }
+},
+};
+
+static inline int aalg_entries(void)
+{
+ return ARRAY_SIZE(aalg_list);
+}
+
+static inline int ealg_entries(void)
+{
+ return ARRAY_SIZE(ealg_list);
+}
+
+static inline int calg_entries(void)
+{
+ return ARRAY_SIZE(calg_list);
+}
+
+/* Todo: generic iterators */
+struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id)
+{
+ int i;
+
+ for (i = 0; i < aalg_entries(); i++) {
+ if (aalg_list[i].desc.sadb_alg_id == alg_id) {
+ if (aalg_list[i].available)
+ return &aalg_list[i];
+ else
+ break;
+ }
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(xfrm_aalg_get_byid);
+
+struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id)
+{
+ int i;
+
+ for (i = 0; i < ealg_entries(); i++) {
+ if (ealg_list[i].desc.sadb_alg_id == alg_id) {
+ if (ealg_list[i].available)
+ return &ealg_list[i];
+ else
+ break;
+ }
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(xfrm_ealg_get_byid);
+
+struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id)
+{
+ int i;
+
+ for (i = 0; i < calg_entries(); i++) {
+ if (calg_list[i].desc.sadb_alg_id == alg_id) {
+ if (calg_list[i].available)
+ return &calg_list[i];
+ else
+ break;
+ }
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(xfrm_calg_get_byid);
+
+static struct xfrm_algo_desc *xfrm_get_byname(struct xfrm_algo_desc *list,
+ int entries, char *name,
+ int probe)
+{
+ int i, status;
+
+ if (!name)
+ return NULL;
+
+ for (i = 0; i < entries; i++) {
+ if (strcmp(name, list[i].name))
+ continue;
+
+ if (list[i].available)
+ return &list[i];
+
+ if (!probe)
+ break;
+
+ status = crypto_alg_available(name, 0);
+ if (!status)
+ break;
+
+ list[i].available = status;
+ return &list[i];
+ }
+ return NULL;
+}
+
+struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe)
+{
+ return xfrm_get_byname(aalg_list, aalg_entries(), name, probe);
+}
+EXPORT_SYMBOL_GPL(xfrm_aalg_get_byname);
+
+struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe)
+{
+ return xfrm_get_byname(ealg_list, ealg_entries(), name, probe);
+}
+EXPORT_SYMBOL_GPL(xfrm_ealg_get_byname);
+
+struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe)
+{
+ return xfrm_get_byname(calg_list, calg_entries(), name, probe);
+}
+EXPORT_SYMBOL_GPL(xfrm_calg_get_byname);
+
+struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx)
+{
+ if (idx >= aalg_entries())
+ return NULL;
+
+ return &aalg_list[idx];
+}
+EXPORT_SYMBOL_GPL(xfrm_aalg_get_byidx);
+
+struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx)
+{
+ if (idx >= ealg_entries())
+ return NULL;
+
+ return &ealg_list[idx];
+}
+EXPORT_SYMBOL_GPL(xfrm_ealg_get_byidx);
+
+/*
+ * Probe for the availability of crypto algorithms, and set the available
+ * flag for any algorithms found on the system. This is typically called by
+ * pfkey during userspace SA add, update or register.
+ */
+void xfrm_probe_algs(void)
+{
+#ifdef CONFIG_CRYPTO
+ int i, status;
+
+ BUG_ON(in_softirq());
+
+ for (i = 0; i < aalg_entries(); i++) {
+ status = crypto_alg_available(aalg_list[i].name, 0);
+ if (aalg_list[i].available != status)
+ aalg_list[i].available = status;
+ }
+
+ for (i = 0; i < ealg_entries(); i++) {
+ status = crypto_alg_available(ealg_list[i].name, 0);
+ if (ealg_list[i].available != status)
+ ealg_list[i].available = status;
+ }
+
+ for (i = 0; i < calg_entries(); i++) {
+ status = crypto_alg_available(calg_list[i].name, 0);
+ if (calg_list[i].available != status)
+ calg_list[i].available = status;
+ }
+#endif
+}
+EXPORT_SYMBOL_GPL(xfrm_probe_algs);
+
+int xfrm_count_auth_supported(void)
+{
+ int i, n;
+
+ for (i = 0, n = 0; i < aalg_entries(); i++)
+ if (aalg_list[i].available)
+ n++;
+ return n;
+}
+EXPORT_SYMBOL_GPL(xfrm_count_auth_supported);
+
+int xfrm_count_enc_supported(void)
+{
+ int i, n;
+
+ for (i = 0, n = 0; i < ealg_entries(); i++)
+ if (ealg_list[i].available)
+ n++;
+ return n;
+}
+EXPORT_SYMBOL_GPL(xfrm_count_enc_supported);
+
+/* Move to common area: it is shared with AH. */
+
+void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
+ int offset, int len, icv_update_fn_t icv_update)
+{
+ int start = skb_headlen(skb);
+ int i, copy = start - offset;
+ struct scatterlist sg;
+
+ /* Checksum header. */
+ if (copy > 0) {
+ if (copy > len)
+ copy = len;
+
+ sg.page = virt_to_page(skb->data + offset);
+ sg.offset = (unsigned long)(skb->data + offset) % PAGE_SIZE;
+ sg.length = copy;
+
+ icv_update(tfm, &sg, 1);
+
+ if ((len -= copy) == 0)
+ return;
+ offset += copy;
+ }
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ int end;
+
+ BUG_TRAP(start <= offset + len);
+
+ end = start + skb_shinfo(skb)->frags[i].size;
+ if ((copy = end - offset) > 0) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+
+ if (copy > len)
+ copy = len;
+
+ sg.page = frag->page;
+ sg.offset = frag->page_offset + offset-start;
+ sg.length = copy;
+
+ icv_update(tfm, &sg, 1);
+
+ if (!(len -= copy))
+ return;
+ offset += copy;
+ }
+ start = end;
+ }
+
+ if (skb_shinfo(skb)->frag_list) {
+ struct sk_buff *list = skb_shinfo(skb)->frag_list;
+
+ for (; list; list = list->next) {
+ int end;
+
+ BUG_TRAP(start <= offset + len);
+
+ end = start + list->len;
+ if ((copy = end - offset) > 0) {
+ if (copy > len)
+ copy = len;
+ skb_icv_walk(list, tfm, offset-start, copy, icv_update);
+ if ((len -= copy) == 0)
+ return;
+ offset += copy;
+ }
+ start = end;
+ }
+ }
+ if (len)
+ BUG();
+}
+EXPORT_SYMBOL_GPL(skb_icv_walk);
+
+#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
+
+/* Looking generic it is not used in another places. */
+
+int
+skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
+{
+ int start = skb_headlen(skb);
+ int i, copy = start - offset;
+ int elt = 0;
+
+ if (copy > 0) {
+ if (copy > len)
+ copy = len;
+ sg[elt].page = virt_to_page(skb->data + offset);
+ sg[elt].offset = (unsigned long)(skb->data + offset) % PAGE_SIZE;
+ sg[elt].length = copy;
+ elt++;
+ if ((len -= copy) == 0)
+ return elt;
+ offset += copy;
+ }
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ int end;
+
+ BUG_TRAP(start <= offset + len);
+
+ end = start + skb_shinfo(skb)->frags[i].size;
+ if ((copy = end - offset) > 0) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+
+ if (copy > len)
+ copy = len;
+ sg[elt].page = frag->page;
+ sg[elt].offset = frag->page_offset+offset-start;
+ sg[elt].length = copy;
+ elt++;
+ if (!(len -= copy))
+ return elt;
+ offset += copy;
+ }
+ start = end;
+ }
+
+ if (skb_shinfo(skb)->frag_list) {
+ struct sk_buff *list = skb_shinfo(skb)->frag_list;
+
+ for (; list; list = list->next) {
+ int end;
+
+ BUG_TRAP(start <= offset + len);
+
+ end = start + list->len;
+ if ((copy = end - offset) > 0) {
+ if (copy > len)
+ copy = len;
+ elt += skb_to_sgvec(list, sg+elt, offset - start, copy);
+ if ((len -= copy) == 0)
+ return elt;
+ offset += copy;
+ }
+ start = end;
+ }
+ }
+ if (len)
+ BUG();
+ return elt;
+}
+EXPORT_SYMBOL_GPL(skb_to_sgvec);
+
+/* Check that skb data bits are writable. If they are not, copy data
+ * to newly created private area. If "tailbits" is given, make sure that
+ * tailbits bytes beyond current end of skb are writable.
+ *
+ * Returns amount of elements of scatterlist to load for subsequent
+ * transformations and pointer to writable trailer skb.
+ */
+
+int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
+{
+ int copyflag;
+ int elt;
+ struct sk_buff *skb1, **skb_p;
+
+ /* If skb is cloned or its head is paged, reallocate
+ * head pulling out all the pages (pages are considered not writable
+ * at the moment even if they are anonymous).
+ */
+ if ((skb_cloned(skb) || skb_shinfo(skb)->nr_frags) &&
+ __pskb_pull_tail(skb, skb_pagelen(skb)-skb_headlen(skb)) == NULL)
+ return -ENOMEM;
+
+ /* Easy case. Most of packets will go this way. */
+ if (!skb_shinfo(skb)->frag_list) {
+ /* A little of trouble, not enough of space for trailer.
+ * This should not happen, when stack is tuned to generate
+ * good frames. OK, on miss we reallocate and reserve even more
+ * space, 128 bytes is fair. */
+
+ if (skb_tailroom(skb) < tailbits &&
+ pskb_expand_head(skb, 0, tailbits-skb_tailroom(skb)+128, GFP_ATOMIC))
+ return -ENOMEM;
+
+ /* Voila! */
+ *trailer = skb;
+ return 1;
+ }
+
+ /* Misery. We are in troubles, going to mincer fragments... */
+
+ elt = 1;
+ skb_p = &skb_shinfo(skb)->frag_list;
+ copyflag = 0;
+
+ while ((skb1 = *skb_p) != NULL) {
+ int ntail = 0;
+
+ /* The fragment is partially pulled by someone,
+ * this can happen on input. Copy it and everything
+ * after it. */
+
+ if (skb_shared(skb1))
+ copyflag = 1;
+
+ /* If the skb is the last, worry about trailer. */
+
+ if (skb1->next == NULL && tailbits) {
+ if (skb_shinfo(skb1)->nr_frags ||
+ skb_shinfo(skb1)->frag_list ||
+ skb_tailroom(skb1) < tailbits)
+ ntail = tailbits + 128;
+ }
+
+ if (copyflag ||
+ skb_cloned(skb1) ||
+ ntail ||
+ skb_shinfo(skb1)->nr_frags ||
+ skb_shinfo(skb1)->frag_list) {
+ struct sk_buff *skb2;
+
+ /* Fuck, we are miserable poor guys... */
+ if (ntail == 0)
+ skb2 = skb_copy(skb1, GFP_ATOMIC);
+ else
+ skb2 = skb_copy_expand(skb1,
+ skb_headroom(skb1),
+ ntail,
+ GFP_ATOMIC);
+ if (unlikely(skb2 == NULL))
+ return -ENOMEM;
+
+ if (skb1->sk)
+ skb_set_owner_w(skb, skb1->sk);
+
+ /* Looking around. Are we still alive?
+ * OK, link new skb, drop old one */
+
+ skb2->next = skb1->next;
+ *skb_p = skb2;
+ kfree_skb(skb1);
+ skb1 = skb2;
+ }
+ elt++;
+ *trailer = skb1;
+ skb_p = &skb1->next;
+ }
+
+ return elt;
+}
+EXPORT_SYMBOL_GPL(skb_cow_data);
+
+void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len)
+{
+ if (tail != skb) {
+ skb->data_len += len;
+ skb->len += len;
+ }
+ return skb_put(tail, len);
+}
+EXPORT_SYMBOL_GPL(pskb_put);
+#endif