[patch 18/51] netlabel: Add CIPSO {set, del}attr request_sock functions

[Greg KH]

2.6.29-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Paul Moore <paul.moore@xxxxxx>

[NOTE: based on 389fb800ac8be2832efedd19978a2b8ced37eb61]

Add the cipso_v4_req_setattr() and cipso_v4_req_delattr() functions to set and
delete the CIPSO security attributes on a request_sock used during a incoming
connection request.

Signed-off-by: Paul Moore <paul.moore@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---

 include/net/cipso_ipv4.h |   17 ++++++
 net/ipv4/cipso_ipv4.c    |  130 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 147 insertions(+)

--- a/include/net/cipso_ipv4.h
+++ b/include/net/cipso_ipv4.h
@@ -40,6 +40,7 @@
 #include <linux/net.h>
 #include <linux/skbuff.h>
 #include <net/netlabel.h>
+#include <net/request_sock.h>
 #include <asm/atomic.h>
 
 /* known doi values */
@@ -215,6 +216,10 @@ int cipso_v4_sock_setattr(struct sock *s
 			  const struct netlbl_lsm_secattr *secattr);
 void cipso_v4_sock_delattr(struct sock *sk);
 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
+int cipso_v4_req_setattr(struct request_sock *req,
+			 const struct cipso_v4_doi *doi_def,
+			 const struct netlbl_lsm_secattr *secattr);
+void cipso_v4_req_delattr(struct request_sock *req);
 int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 			    const struct cipso_v4_doi *doi_def,
 			    const struct netlbl_lsm_secattr *secattr);
@@ -247,6 +252,18 @@ static inline int cipso_v4_sock_getattr(
 	return -ENOSYS;
 }
 
+static inline int cipso_v4_req_setattr(struct request_sock *req,
+				       const struct cipso_v4_doi *doi_def,
+				       const struct netlbl_lsm_secattr *secattr)
+{
+	return -ENOSYS;
+}
+
+static inline void cipso_v4_req_delattr(struct request_sock *req)
+{
+	return;
+}
+
 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 				      const struct cipso_v4_doi *doi_def,
 				      const struct netlbl_lsm_secattr *secattr)
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -1942,6 +1942,72 @@ socket_setattr_failure:
 }
 
 /**
+ * cipso_v4_req_setattr - Add a CIPSO option to a connection request socket
+ * @req: the connection request socket
+ * @doi_def: the CIPSO DOI to use
+ * @secattr: the specific security attributes of the socket
+ *
+ * Description:
+ * Set the CIPSO option on the given socket using the DOI definition and
+ * security attributes passed to the function.  Returns zero on success and
+ * negative values on failure.
+ *
+ */
+int cipso_v4_req_setattr(struct request_sock *req,
+			 const struct cipso_v4_doi *doi_def,
+			 const struct netlbl_lsm_secattr *secattr)
+{
+	int ret_val = -EPERM;
+	unsigned char *buf = NULL;
+	u32 buf_len;
+	u32 opt_len;
+	struct ip_options *opt = NULL;
+	struct inet_request_sock *req_inet;
+
+	/* We allocate the maximum CIPSO option size here so we are probably
+	 * being a little wasteful, but it makes our life _much_ easier later
+	 * on and after all we are only talking about 40 bytes. */
+	buf_len = CIPSO_V4_OPT_LEN_MAX;
+	buf = kmalloc(buf_len, GFP_ATOMIC);
+	if (buf == NULL) {
+		ret_val = -ENOMEM;
+		goto req_setattr_failure;
+	}
+
+	ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr);
+	if (ret_val < 0)
+		goto req_setattr_failure;
+	buf_len = ret_val;
+
+	/* We can't use ip_options_get() directly because it makes a call to
+	 * ip_options_get_alloc() which allocates memory with GFP_KERNEL and
+	 * we won't always have CAP_NET_RAW even though we _always_ want to
+	 * set the IPOPT_CIPSO option. */
+	opt_len = (buf_len + 3) & ~3;
+	opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC);
+	if (opt == NULL) {
+		ret_val = -ENOMEM;
+		goto req_setattr_failure;
+	}
+	memcpy(opt->__data, buf, buf_len);
+	opt->optlen = opt_len;
+	opt->cipso = sizeof(struct iphdr);
+	kfree(buf);
+	buf = NULL;
+
+	req_inet = inet_rsk(req);
+	opt = xchg(&req_inet->opt, opt);
+	kfree(opt);
+
+	return 0;
+
+req_setattr_failure:
+	kfree(buf);
+	kfree(opt);
+	return ret_val;
+}
+
+/**
  * cipso_v4_sock_delattr - Delete the CIPSO option from a socket
  * @sk: the socket
  *
@@ -2016,6 +2082,70 @@ void cipso_v4_sock_delattr(struct sock *
 }
 
 /**
+ * cipso_v4_req_delattr - Delete the CIPSO option from a request socket
+ * @reg: the request socket
+ *
+ * Description:
+ * Removes the CIPSO option from a request socket, if present.
+ *
+ */
+void cipso_v4_req_delattr(struct request_sock *req)
+{
+	struct ip_options *opt;
+	struct inet_request_sock *req_inet;
+
+	req_inet = inet_rsk(req);
+	opt = req_inet->opt;
+	if (opt == NULL || opt->cipso == 0)
+		return;
+
+	if (opt->srr || opt->rr || opt->ts || opt->router_alert) {
+		u8 cipso_len;
+		u8 cipso_off;
+		unsigned char *cipso_ptr;
+		int iter;
+		int optlen_new;
+
+		cipso_off = opt->cipso - sizeof(struct iphdr);
+		cipso_ptr = &opt->__data[cipso_off];
+		cipso_len = cipso_ptr[1];
+
+		if (opt->srr > opt->cipso)
+			opt->srr -= cipso_len;
+		if (opt->rr > opt->cipso)
+			opt->rr -= cipso_len;
+		if (opt->ts > opt->cipso)
+			opt->ts -= cipso_len;
+		if (opt->router_alert > opt->cipso)
+			opt->router_alert -= cipso_len;
+		opt->cipso = 0;
+
+		memmove(cipso_ptr, cipso_ptr + cipso_len,
+			opt->optlen - cipso_off - cipso_len);
+
+		/* determining the new total option length is tricky because of
+		 * the padding necessary, the only thing i can think to do at
+		 * this point is walk the options one-by-one, skipping the
+		 * padding at the end to determine the actual option size and
+		 * from there we can determine the new total option length */
+		iter = 0;
+		optlen_new = 0;
+		while (iter < opt->optlen)
+			if (opt->__data[iter] != IPOPT_NOP) {
+				iter += opt->__data[iter + 1];
+				optlen_new = iter;
+			} else
+				iter++;
+		opt->optlen = (optlen_new + 3) & ~3;
+	} else {
+		/* only the cipso option was present on the socket so we can
+		 * remove the entire option struct */
+		req_inet->opt = NULL;
+		kfree(opt);
+	}
+}
+
+/**
  * cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions
  * @cipso: the CIPSO v4 option
  * @secattr: the security attributes


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