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Diffstat (limited to 'net/ipv4/icmp.c')
-rw-r--r--net/ipv4/icmp.c191
1 files changed, 40 insertions, 151 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index c75efbdc71cb..f2eccd531746 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -95,6 +95,7 @@
#include <net/checksum.h>
#include <net/xfrm.h>
#include <net/inet_common.h>
+#include <net/ip_fib.h>
/*
* Build xmit assembly blocks
@@ -253,10 +254,10 @@ static inline bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
/* Limit if icmp type is enabled in ratemask. */
if ((1 << type) & net->ipv4.sysctl_icmp_ratemask) {
- if (!rt->peer)
- rt_bind_peer(rt, fl4->daddr, 1);
- rc = inet_peer_xrlim_allow(rt->peer,
+ struct inet_peer *peer = inet_getpeer_v4(net->ipv4.peers, fl4->daddr, 1);
+ rc = inet_peer_xrlim_allow(peer,
net->ipv4.sysctl_icmp_ratelimit);
+ inet_putpeer(peer);
}
out:
return rc;
@@ -334,7 +335,7 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
struct flowi4 fl4;
struct sock *sk;
struct inet_sock *inet;
- __be32 daddr;
+ __be32 daddr, saddr;
if (ip_options_echo(&icmp_param->replyopts.opt.opt, skb))
return;
@@ -348,6 +349,7 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
inet->tos = ip_hdr(skb)->tos;
daddr = ipc.addr = ip_hdr(skb)->saddr;
+ saddr = fib_compute_spec_dst(skb);
ipc.opt = NULL;
ipc.tx_flags = 0;
if (icmp_param->replyopts.opt.opt.optlen) {
@@ -357,7 +359,7 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
}
memset(&fl4, 0, sizeof(fl4));
fl4.daddr = daddr;
- fl4.saddr = rt->rt_spec_dst;
+ fl4.saddr = saddr;
fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
fl4.flowi4_proto = IPPROTO_ICMP;
security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
@@ -569,7 +571,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
rcu_read_lock();
if (rt_is_input_route(rt) &&
net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr)
- dev = dev_get_by_index_rcu(net, rt->rt_iif);
+ dev = dev_get_by_index_rcu(net, inet_iif(skb_in));
if (dev)
saddr = inet_select_addr(dev, 0, RT_SCOPE_LINK);
@@ -632,6 +634,27 @@ out:;
EXPORT_SYMBOL(icmp_send);
+static void icmp_socket_deliver(struct sk_buff *skb, u32 info)
+{
+ const struct iphdr *iph = (const struct iphdr *) skb->data;
+ const struct net_protocol *ipprot;
+ int protocol = iph->protocol;
+
+ /* Checkin full IP header plus 8 bytes of protocol to
+ * avoid additional coding at protocol handlers.
+ */
+ if (!pskb_may_pull(skb, iph->ihl * 4 + 8))
+ return;
+
+ raw_icmp_error(skb, protocol, info);
+
+ rcu_read_lock();
+ ipprot = rcu_dereference(inet_protos[protocol]);
+ if (ipprot && ipprot->err_handler)
+ ipprot->err_handler(skb, info);
+ rcu_read_unlock();
+}
+
/*
* Handle ICMP_DEST_UNREACH, ICMP_TIME_EXCEED, and ICMP_QUENCH.
*/
@@ -640,10 +663,8 @@ static void icmp_unreach(struct sk_buff *skb)
{
const struct iphdr *iph;
struct icmphdr *icmph;
- int hash, protocol;
- const struct net_protocol *ipprot;
- u32 info = 0;
struct net *net;
+ u32 info = 0;
net = dev_net(skb_dst(skb)->dev);
@@ -674,9 +695,7 @@ static void icmp_unreach(struct sk_buff *skb)
LIMIT_NETDEBUG(KERN_INFO pr_fmt("%pI4: fragmentation needed and DF set\n"),
&iph->daddr);
} else {
- info = ip_rt_frag_needed(net, iph,
- ntohs(icmph->un.frag.mtu),
- skb->dev);
+ info = ntohs(icmph->un.frag.mtu);
if (!info)
goto out;
}
@@ -720,26 +739,7 @@ static void icmp_unreach(struct sk_buff *skb)
goto out;
}
- /* Checkin full IP header plus 8 bytes of protocol to
- * avoid additional coding at protocol handlers.
- */
- if (!pskb_may_pull(skb, iph->ihl * 4 + 8))
- goto out;
-
- iph = (const struct iphdr *)skb->data;
- protocol = iph->protocol;
-
- /*
- * Deliver ICMP message to raw sockets. Pretty useless feature?
- */
- raw_icmp_error(skb, protocol, info);
-
- hash = protocol & (MAX_INET_PROTOS - 1);
- rcu_read_lock();
- ipprot = rcu_dereference(inet_protos[hash]);
- if (ipprot && ipprot->err_handler)
- ipprot->err_handler(skb, info);
- rcu_read_unlock();
+ icmp_socket_deliver(skb, info);
out:
return;
@@ -755,46 +755,15 @@ out_err:
static void icmp_redirect(struct sk_buff *skb)
{
- const struct iphdr *iph;
-
- if (skb->len < sizeof(struct iphdr))
- goto out_err;
-
- /*
- * Get the copied header of the packet that caused the redirect
- */
- if (!pskb_may_pull(skb, sizeof(struct iphdr)))
- goto out;
-
- iph = (const struct iphdr *)skb->data;
-
- switch (icmp_hdr(skb)->code & 7) {
- case ICMP_REDIR_NET:
- case ICMP_REDIR_NETTOS:
- /*
- * As per RFC recommendations now handle it as a host redirect.
- */
- case ICMP_REDIR_HOST:
- case ICMP_REDIR_HOSTTOS:
- ip_rt_redirect(ip_hdr(skb)->saddr, iph->daddr,
- icmp_hdr(skb)->un.gateway,
- iph->saddr, skb->dev);
- break;
+ if (skb->len < sizeof(struct iphdr)) {
+ ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS);
+ return;
}
- /* Ping wants to see redirects.
- * Let's pretend they are errors of sorts... */
- if (iph->protocol == IPPROTO_ICMP &&
- iph->ihl >= 5 &&
- pskb_may_pull(skb, (iph->ihl<<2)+8)) {
- ping_err(skb, icmp_hdr(skb)->un.gateway);
- }
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ return;
-out:
- return;
-out_err:
- ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS);
- goto out;
+ icmp_socket_deliver(skb, icmp_hdr(skb)->un.gateway);
}
/*
@@ -868,86 +837,6 @@ out_err:
goto out;
}
-
-/*
- * Handle ICMP_ADDRESS_MASK requests. (RFC950)
- *
- * RFC1122 (3.2.2.9). A host MUST only send replies to
- * ADDRESS_MASK requests if it's been configured as an address mask
- * agent. Receiving a request doesn't constitute implicit permission to
- * act as one. Of course, implementing this correctly requires (SHOULD)
- * a way to turn the functionality on and off. Another one for sysctl(),
- * I guess. -- MS
- *
- * RFC1812 (4.3.3.9). A router MUST implement it.
- * A router SHOULD have switch turning it on/off.
- * This switch MUST be ON by default.
- *
- * Gratuitous replies, zero-source replies are not implemented,
- * that complies with RFC. DO NOT implement them!!! All the idea
- * of broadcast addrmask replies as specified in RFC950 is broken.
- * The problem is that it is not uncommon to have several prefixes
- * on one physical interface. Moreover, addrmask agent can even be
- * not aware of existing another prefixes.
- * If source is zero, addrmask agent cannot choose correct prefix.
- * Gratuitous mask announcements suffer from the same problem.
- * RFC1812 explains it, but still allows to use ADDRMASK,
- * that is pretty silly. --ANK
- *
- * All these rules are so bizarre, that I removed kernel addrmask
- * support at all. It is wrong, it is obsolete, nobody uses it in
- * any case. --ANK
- *
- * Furthermore you can do it with a usermode address agent program
- * anyway...
- */
-
-static void icmp_address(struct sk_buff *skb)
-{
-#if 0
- net_dbg_ratelimited("a guy asks for address mask. Who is it?\n");
-#endif
-}
-
-/*
- * RFC1812 (4.3.3.9). A router SHOULD listen all replies, and complain
- * loudly if an inconsistency is found.
- * called with rcu_read_lock()
- */
-
-static void icmp_address_reply(struct sk_buff *skb)
-{
- struct rtable *rt = skb_rtable(skb);
- struct net_device *dev = skb->dev;
- struct in_device *in_dev;
- struct in_ifaddr *ifa;
-
- if (skb->len < 4 || !(rt->rt_flags&RTCF_DIRECTSRC))
- return;
-
- in_dev = __in_dev_get_rcu(dev);
- if (!in_dev)
- return;
-
- if (in_dev->ifa_list &&
- IN_DEV_LOG_MARTIANS(in_dev) &&
- IN_DEV_FORWARD(in_dev)) {
- __be32 _mask, *mp;
-
- mp = skb_header_pointer(skb, 0, sizeof(_mask), &_mask);
- BUG_ON(mp == NULL);
- for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
- if (*mp == ifa->ifa_mask &&
- inet_ifa_match(ip_hdr(skb)->saddr, ifa))
- break;
- }
- if (!ifa)
- net_info_ratelimited("Wrong address mask %pI4 from %s/%pI4\n",
- mp,
- dev->name, &ip_hdr(skb)->saddr);
- }
-}
-
static void icmp_discard(struct sk_buff *skb)
{
}
@@ -1111,10 +1000,10 @@ static const struct icmp_control icmp_pointers[NR_ICMP_TYPES + 1] = {
.handler = icmp_discard,
},
[ICMP_ADDRESS] = {
- .handler = icmp_address,
+ .handler = icmp_discard,
},
[ICMP_ADDRESSREPLY] = {
- .handler = icmp_address_reply,
+ .handler = icmp_discard,
},
};