path: root/include/net
diff options
authorEric Dumazet <edumazet@google.com>2015-03-11 18:53:14 -0700
committerDavid S. Miller <davem@davemloft.net>2015-03-11 21:55:28 -0400
commit33cf7c90fe2f97afb1cadaa0cfb782cb9d1b9ee2 (patch)
tree7a0c80d0b2bb618919d966ce5b827c7eb8f843f6 /include/net
parentfib_trie: Only display main table in /proc/net/route (diff)
net: add real socket cookies
A long standing problem in netlink socket dumps is the use of kernel socket addresses as cookies. 1) It is a security concern. 2) Sockets can be reused quite quickly, so there is no guarantee a cookie is used once and identify a flow. 3) request sock, establish sock, and timewait socks for a given flow have different cookies. Part of our effort to bring better TCP statistics requires to switch to a different allocator. In this patch, I chose to use a per network namespace 64bit generator, and to use it only in the case a socket needs to be dumped to netlink. (This might be refined later if needed) Note that I tried to carry cookies from request sock, to establish sock, then timewait sockets. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Eric Salo <salo@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
4 files changed, 8 insertions, 0 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index eb16c7beed1e..e565afdc14ad 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -77,6 +77,8 @@ struct inet_request_sock {
#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
#define ir_iif req.__req_common.skc_bound_dev_if
+#define ir_cookie req.__req_common.skc_cookie
+#define ireq_net req.__req_common.skc_net
u16 snd_wscale : 4,
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index 6c566034e26d..b7ce1003c429 100644
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -122,6 +122,7 @@ struct inet_timewait_sock {
#define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr
#define tw_dport __tw_common.skc_dport
#define tw_num __tw_common.skc_num
+#define tw_cookie __tw_common.skc_cookie
int tw_timeout;
volatile unsigned char tw_substate;
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 2cb9acb618e9..e086f4030dd2 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -56,6 +56,8 @@ struct net {
spinlock_t rules_mod_lock;
+ atomic64_t cookie_gen;
struct list_head list; /* list of network namespaces */
struct list_head cleanup_list; /* namespaces on death row */
struct list_head exit_list; /* Use only net_mutex */
diff --git a/include/net/sock.h b/include/net/sock.h
index 250822cc1e02..d996c633bec2 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -199,6 +199,8 @@ struct sock_common {
struct in6_addr skc_v6_rcv_saddr;
+ atomic64_t skc_cookie;
* fields between dontcopy_begin/dontcopy_end
* are not copied in sock_copy()
@@ -329,6 +331,7 @@ struct sock {
#define sk_net __sk_common.skc_net
#define sk_v6_daddr __sk_common.skc_v6_daddr
#define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr
+#define sk_cookie __sk_common.skc_cookie
socket_lock_t sk_lock;
struct sk_buff_head sk_receive_queue;