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Diffstat (limited to 'net/ipv4/ah4.c')
-rw-r--r--net/ipv4/ah4.c126
1 files changed, 91 insertions, 35 deletions
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index 36d14406261..a2afa89513a 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -1,3 +1,5 @@
+#define pr_fmt(fmt) "IPsec: " fmt
+
#include <crypto/hash.h>
#include <linux/err.h>
#include <linux/module.h>
@@ -75,7 +77,7 @@ static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
static int ip_clear_mutable_options(const struct iphdr *iph, __be32 *daddr)
{
- unsigned char * optptr = (unsigned char*)(iph+1);
+ unsigned char *optptr = (unsigned char *)(iph+1);
int l = iph->ihl*4 - sizeof(struct iphdr);
int optlen;
@@ -153,6 +155,10 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
struct iphdr *iph, *top_iph;
struct ip_auth_hdr *ah;
struct ah_data *ahp;
+ int seqhi_len = 0;
+ __be32 *seqhi;
+ int sglists = 0;
+ struct scatterlist *seqhisg;
ahp = x->data;
ahash = ahp->ahash;
@@ -165,14 +171,19 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
ah = ip_auth_hdr(skb);
ihl = ip_hdrlen(skb);
+ if (x->props.flags & XFRM_STATE_ESN) {
+ sglists = 1;
+ seqhi_len = sizeof(*seqhi);
+ }
err = -ENOMEM;
- iph = ah_alloc_tmp(ahash, nfrags, ihl);
+ iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl + seqhi_len);
if (!iph)
goto out;
-
- icv = ah_tmp_icv(ahash, iph, ihl);
+ seqhi = (__be32 *)((char *)iph + ihl);
+ icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
req = ah_tmp_req(ahash, icv);
sg = ah_req_sg(ahash, req);
+ seqhisg = sg + nfrags;
memset(ah->auth_data, 0, ahp->icv_trunc_len);
@@ -208,10 +219,15 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
ah->spi = x->id.spi;
ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
- sg_init_table(sg, nfrags);
- skb_to_sgvec(skb, sg, 0, skb->len);
+ sg_init_table(sg, nfrags + sglists);
+ skb_to_sgvec_nomark(skb, sg, 0, skb->len);
- ahash_request_set_crypt(req, sg, icv, skb->len);
+ if (x->props.flags & XFRM_STATE_ESN) {
+ /* Attach seqhi sg right after packet payload */
+ *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
+ sg_set_buf(seqhisg, seqhi, seqhi_len);
+ }
+ ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
ahash_request_set_callback(req, 0, ah_output_done, skb);
AH_SKB_CB(skb)->tmp = iph;
@@ -267,7 +283,11 @@ static void ah_input_done(struct crypto_async_request *base, int err)
skb->network_header += ah_hlen;
memcpy(skb_network_header(skb), work_iph, ihl);
__skb_pull(skb, ah_hlen + ihl);
- skb_set_transport_header(skb, -ihl);
+
+ if (x->props.mode == XFRM_MODE_TUNNEL)
+ skb_reset_transport_header(skb);
+ else
+ skb_set_transport_header(skb, -ihl);
out:
kfree(AH_SKB_CB(skb)->tmp);
xfrm_input_resume(skb, err);
@@ -289,6 +309,10 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
struct ip_auth_hdr *ah;
struct ah_data *ahp;
int err = -ENOMEM;
+ int seqhi_len = 0;
+ __be32 *seqhi;
+ int sglists = 0;
+ struct scatterlist *seqhisg;
if (!pskb_may_pull(skb, sizeof(*ah)))
goto out;
@@ -315,8 +339,7 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
/* We are going to _remove_ AH header to keep sockets happy,
* so... Later this can change. */
- if (skb_cloned(skb) &&
- pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+ if (skb_unclone(skb, GFP_ATOMIC))
goto out;
skb->ip_summed = CHECKSUM_NONE;
@@ -330,14 +353,22 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
iph = ip_hdr(skb);
ihl = ip_hdrlen(skb);
- work_iph = ah_alloc_tmp(ahash, nfrags, ihl + ahp->icv_trunc_len);
+ if (x->props.flags & XFRM_STATE_ESN) {
+ sglists = 1;
+ seqhi_len = sizeof(*seqhi);
+ }
+
+ work_iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl +
+ ahp->icv_trunc_len + seqhi_len);
if (!work_iph)
goto out;
- auth_data = ah_tmp_auth(work_iph, ihl);
+ seqhi = (__be32 *)((char *)work_iph + ihl);
+ auth_data = ah_tmp_auth(seqhi, seqhi_len);
icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
req = ah_tmp_req(ahash, icv);
sg = ah_req_sg(ahash, req);
+ seqhisg = sg + nfrags;
memcpy(work_iph, iph, ihl);
memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
@@ -356,10 +387,15 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
skb_push(skb, ihl);
- sg_init_table(sg, nfrags);
- skb_to_sgvec(skb, sg, 0, skb->len);
+ sg_init_table(sg, nfrags + sglists);
+ skb_to_sgvec_nomark(skb, sg, 0, skb->len);
- ahash_request_set_crypt(req, sg, icv, skb->len);
+ if (x->props.flags & XFRM_STATE_ESN) {
+ /* Attach seqhi sg right after packet payload */
+ *seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
+ sg_set_buf(seqhisg, seqhi, seqhi_len);
+ }
+ ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
ahash_request_set_callback(req, 0, ah_input_done, skb);
AH_SKB_CB(skb)->tmp = work_iph;
@@ -379,7 +415,10 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
skb->network_header += ah_hlen;
memcpy(skb_network_header(skb), work_iph, ihl);
__skb_pull(skb, ah_hlen + ihl);
- skb_set_transport_header(skb, -ihl);
+ if (x->props.mode == XFRM_MODE_TUNNEL)
+ skb_reset_transport_header(skb);
+ else
+ skb_set_transport_header(skb, -ihl);
err = nexthdr;
@@ -389,24 +428,35 @@ out:
return err;
}
-static void ah4_err(struct sk_buff *skb, u32 info)
+static int ah4_err(struct sk_buff *skb, u32 info)
{
struct net *net = dev_net(skb->dev);
const struct iphdr *iph = (const struct iphdr *)skb->data;
struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
struct xfrm_state *x;
- if (icmp_hdr(skb)->type != ICMP_DEST_UNREACH ||
- icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
- return;
+ switch (icmp_hdr(skb)->type) {
+ case ICMP_DEST_UNREACH:
+ if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
+ return 0;
+ case ICMP_REDIRECT:
+ break;
+ default:
+ return 0;
+ }
x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
ah->spi, IPPROTO_AH, AF_INET);
if (!x)
- return;
- printk(KERN_DEBUG "pmtu discovery on SA AH/%08x/%08x\n",
- ntohl(ah->spi), ntohl(iph->daddr));
+ return 0;
+
+ if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
+ ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_AH, 0);
+ else
+ ipv4_redirect(skb, net, 0, 0, IPPROTO_AH, 0);
xfrm_state_put(x);
+
+ return 0;
}
static int ah_init_state(struct xfrm_state *x)
@@ -445,9 +495,10 @@ static int ah_init_state(struct xfrm_state *x)
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
crypto_ahash_digestsize(ahash)) {
- printk(KERN_INFO "AH: %s digestsize %u != %hu\n",
- x->aalg->alg_name, crypto_ahash_digestsize(ahash),
- aalg_desc->uinfo.auth.icv_fullbits/8);
+ pr_info("%s: %s digestsize %u != %hu\n",
+ __func__, x->aalg->alg_name,
+ crypto_ahash_digestsize(ahash),
+ aalg_desc->uinfo.auth.icv_fullbits / 8);
goto error;
}
@@ -487,6 +538,10 @@ static void ah_destroy(struct xfrm_state *x)
kfree(ahp);
}
+static int ah4_rcv_cb(struct sk_buff *skb, int err)
+{
+ return 0;
+}
static const struct xfrm_type ah_type =
{
@@ -500,21 +555,22 @@ static const struct xfrm_type ah_type =
.output = ah_output
};
-static const struct net_protocol ah4_protocol = {
+static struct xfrm4_protocol ah4_protocol = {
.handler = xfrm4_rcv,
+ .input_handler = xfrm_input,
+ .cb_handler = ah4_rcv_cb,
.err_handler = ah4_err,
- .no_policy = 1,
- .netns_ok = 1,
+ .priority = 0,
};
static int __init ah4_init(void)
{
if (xfrm_register_type(&ah_type, AF_INET) < 0) {
- printk(KERN_INFO "ip ah init: can't add xfrm type\n");
+ pr_info("%s: can't add xfrm type\n", __func__);
return -EAGAIN;
}
- if (inet_add_protocol(&ah4_protocol, IPPROTO_AH) < 0) {
- printk(KERN_INFO "ip ah init: can't add protocol\n");
+ if (xfrm4_protocol_register(&ah4_protocol, IPPROTO_AH) < 0) {
+ pr_info("%s: can't add protocol\n", __func__);
xfrm_unregister_type(&ah_type, AF_INET);
return -EAGAIN;
}
@@ -523,10 +579,10 @@ static int __init ah4_init(void)
static void __exit ah4_fini(void)
{
- if (inet_del_protocol(&ah4_protocol, IPPROTO_AH) < 0)
- printk(KERN_INFO "ip ah close: can't remove protocol\n");
+ if (xfrm4_protocol_deregister(&ah4_protocol, IPPROTO_AH) < 0)
+ pr_info("%s: can't remove protocol\n", __func__);
if (xfrm_unregister_type(&ah_type, AF_INET) < 0)
- printk(KERN_INFO "ip ah close: can't remove xfrm type\n");
+ pr_info("%s: can't remove xfrm type\n", __func__);
}
module_init(ah4_init);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 12:05:10 +0000