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tcp: introduce __tcp_fastopen_cookie_gen_cipher() 

Restructure __tcp_fastopen_cookie_gen() to take a 'struct crypto_cipher'
argument and rename it as __tcp_fastopen_cookie_gen_cipher(). Subsequent
patches will provide different ciphers based on which key is being used for
the cookie generation.

Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: Jason Baron <jbaron@akamai.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Paasch 2019-05-29 12:33:56 -04:00 committed by David S. Miller
parent 5b5d331a2c
commit 483642e5ea
1 changed files with 38 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
net/ipv4/tcp_fastopen.c
View File

@ -111,25 +111,38 @@ error: kfree(ctx);
return err;
}
static bool __tcp_fastopen_cookie_gen(struct sock *sk, const void *path,
static bool __tcp_fastopen_cookie_gen_cipher(struct request_sock *req,
struct sk_buff *syn,
struct crypto_cipher *tfm,
struct tcp_fastopen_cookie *foc)
{
struct tcp_fastopen_context *ctx;
bool ok = false;
if (req->rsk_ops->family == AF_INET) {
const struct iphdr *iph = ip_hdr(syn);
__be32 path[4] = { iph->saddr, iph->daddr, 0, 0 };
rcu_read_lock();
ctx = rcu_dereference(inet_csk(sk)->icsk_accept_queue.fastopenq.ctx);
if (!ctx)
ctx = rcu_dereference(sock_net(sk)->ipv4.tcp_fastopen_ctx);
if (ctx) {
crypto_cipher_encrypt_one(ctx->tfm, foc->val, path);
crypto_cipher_encrypt_one(tfm, foc->val, (void *)path);
foc->len = TCP_FASTOPEN_COOKIE_SIZE;
ok = true;
return true;
}
rcu_read_unlock();
return ok;
#if IS_ENABLED(CONFIG_IPV6)
if (req->rsk_ops->family == AF_INET6) {
const struct ipv6hdr *ip6h = ipv6_hdr(syn);
struct tcp_fastopen_cookie tmp;
struct in6_addr *buf;
int i;
crypto_cipher_encrypt_one(tfm, tmp.val,
(void *)&ip6h->saddr);
buf = &tmp.addr;
for (i = 0; i < 4; i++)
buf->s6_addr32[i] ^= ip6h->daddr.s6_addr32[i];
crypto_cipher_encrypt_one(tfm, foc->val, (void *)buf);
foc->len = TCP_FASTOPEN_COOKIE_SIZE;
return true;
}
#endif
return false;
}
/* Generate the fastopen cookie by doing aes128 encryption on both
@ -143,29 +156,17 @@ static bool tcp_fastopen_cookie_gen(struct sock *sk,
struct sk_buff *syn,
struct tcp_fastopen_cookie *foc)
{
if (req->rsk_ops->family == AF_INET) {
const struct iphdr *iph = ip_hdr(syn);
struct tcp_fastopen_context *ctx;
bool ok = false;
__be32 path[4] = { iph->saddr, iph->daddr, 0, 0 };
return __tcp_fastopen_cookie_gen(sk, path, foc);
}
#if IS_ENABLED(CONFIG_IPV6)
if (req->rsk_ops->family == AF_INET6) {
const struct ipv6hdr *ip6h = ipv6_hdr(syn);
struct tcp_fastopen_cookie tmp;
if (__tcp_fastopen_cookie_gen(sk, &ip6h->saddr, &tmp)) {
struct in6_addr *buf = &tmp.addr;
int i;
for (i = 0; i < 4; i++)
buf->s6_addr32[i] ^= ip6h->daddr.s6_addr32[i];
return __tcp_fastopen_cookie_gen(sk, buf, foc);
}
}
#endif
return false;
rcu_read_lock();
ctx = rcu_dereference(inet_csk(sk)->icsk_accept_queue.fastopenq.ctx);
if (!ctx)
ctx = rcu_dereference(sock_net(sk)->ipv4.tcp_fastopen_ctx);
if (ctx)
ok = __tcp_fastopen_cookie_gen_cipher(req, syn, ctx->tfm, foc);
rcu_read_unlock();
return ok;
}