path: root/net/ipv4/inet_diag.c
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 /net/ipv4/inet_diag.c
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 'net/ipv4/inet_diag.c')
1 files changed, 9 insertions, 5 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index ac3bfb458afd..29317ff4a007 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -221,12 +221,13 @@ static int inet_csk_diag_fill(struct sock *sk,
user_ns, portid, seq, nlmsg_flags, unlh);
-static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
+static int inet_twsk_diag_fill(struct sock *sk,
struct sk_buff *skb,
const struct inet_diag_req_v2 *req,
u32 portid, u32 seq, u16 nlmsg_flags,
const struct nlmsghdr *unlh)
+ struct inet_timewait_sock *tw = inet_twsk(sk);
struct inet_diag_msg *r;
struct nlmsghdr *nlh;
s32 tmo;
@@ -247,7 +248,7 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
r->idiag_retrans = 0;
r->id.idiag_if = tw->tw_bound_dev_if;
- sock_diag_save_cookie(tw, r->id.idiag_cookie);
+ sock_diag_save_cookie(sk, r->id.idiag_cookie);
r->id.idiag_sport = tw->tw_sport;
r->id.idiag_dport = tw->tw_dport;
@@ -283,7 +284,7 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
const struct nlmsghdr *unlh)
if (sk->sk_state == TCP_TIME_WAIT)
- return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq,
+ return inet_twsk_diag_fill(sk, skb, r, portid, seq,
nlmsg_flags, unlh);
return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
@@ -675,7 +676,7 @@ static int inet_twsk_diag_dump(struct sock *sk,
if (!inet_diag_bc_sk(bc, sk))
return 0;
- return inet_twsk_diag_fill(inet_twsk(sk), skb, r,
+ return inet_twsk_diag_fill(sk, skb, r,
cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
@@ -734,7 +735,10 @@ static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
r->idiag_retrans = req->num_retrans;
r->id.idiag_if = sk->sk_bound_dev_if;
- sock_diag_save_cookie(req, r->id.idiag_cookie);
+ BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
+ offsetof(struct sock, sk_cookie));
+ sock_diag_save_cookie((struct sock *)ireq, r->id.idiag_cookie);
tmo = req->expires - jiffies;
if (tmo < 0)