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| author | David S. Miller <davem@davemloft.net> | 2013-02-05 14:42:23 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-02-05 14:42:23 -0500 |
| commit | 547472b8e1da72ae226430c0c4273e36fc8ca768 (patch) | |
| tree | 2300023f8d0fa943725e1b4ea3b2b95c91de4430 | |
| parent | 9d6ddb19905223828485d8c40deaec76e4dea3a5 (diff) | |
| download | linux-3.10-547472b8e1da72ae226430c0c4273e36fc8ca768.tar.gz linux-3.10-547472b8e1da72ae226430c0c4273e36fc8ca768.tar.bz2 linux-3.10-547472b8e1da72ae226430c0c4273e36fc8ca768.zip | |
ipv4: Disallow non-namespace aware protocols to register.
All in-tree ipv4 protocol implementations are now namespace
aware. Therefore all the run-time checks are superfluous.
Reject registry of any non-namespace aware ipv4 protocol.
Eventually we'll remove prot->netns_ok and this registry
time check as well.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/af_inet.c | 19 | ||||
| -rw-r--r-- | net/ipv4/ip_input.c | 7 | ||||
| -rw-r--r-- | net/ipv4/protocol.c | 6 |
3 files changed, 6 insertions, 26 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 49ddca31c4d..1aec92bf801 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -263,21 +263,6 @@ void build_ehash_secret(void) } EXPORT_SYMBOL(build_ehash_secret); -static inline int inet_netns_ok(struct net *net, __u8 protocol) -{ - const struct net_protocol *ipprot; - - if (net_eq(net, &init_net)) - return 1; - - ipprot = rcu_dereference(inet_protos[protocol]); - if (ipprot == NULL) { - /* raw IP is OK */ - return 1; - } - return ipprot->netns_ok; -} - /* * Create an inet socket. */ @@ -350,10 +335,6 @@ lookup_protocol: !ns_capable(net->user_ns, CAP_NET_RAW)) goto out_rcu_unlock; - err = -EAFNOSUPPORT; - if (!inet_netns_ok(net, protocol)) - goto out_rcu_unlock; - sock->ops = answer->ops; answer_prot = answer->prot; answer_no_check = answer->no_check; diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index f1395a6fb35..87abd3e2bd3 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -208,13 +208,6 @@ static int ip_local_deliver_finish(struct sk_buff *skb) if (ipprot != NULL) { int ret; - if (!net_eq(net, &init_net) && !ipprot->netns_ok) { - net_info_ratelimited("%s: proto %d isn't netns-ready\n", - __func__, protocol); - kfree_skb(skb); - goto out; - } - if (!ipprot->no_policy) { if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { kfree_skb(skb); diff --git a/net/ipv4/protocol.c b/net/ipv4/protocol.c index 0f9d09f54bd..ce848461acb 100644 --- a/net/ipv4/protocol.c +++ b/net/ipv4/protocol.c @@ -37,6 +37,12 @@ const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly; int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol) { + if (!prot->netns_ok) { + pr_err("Protocol %u is not namespace aware, cannot register.\n", + protocol); + return -EINVAL; + } + return !cmpxchg((const struct net_protocol **)&inet_protos[protocol], NULL, prot) ? 0 : -1; } |