for_each_possible_cpu(i) {
struct rtable __rcu **prt;
+
prt = per_cpu_ptr(nhc->nhc_pcpu_rth_output, i);
rt = rcu_dereference(*prt);
if (rt)
}
/*
- We do not cache source address of outgoing interface,
- because it is used only by IP RR, TS and SRR options,
- so that it out of fast path.
-
- BTW remember: "addr" is allowed to be not aligned
- in IP options!
+ * We do not cache source address of outgoing interface,
+ * because it is used only by IP RR, TS and SRR options,
+ * so that it out of fast path.
+ *
+ * BTW remember: "addr" is allowed to be not aligned
+ * in IP options!
*/
void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt)
goto out;
/* Check for the most weird martians, which can be not detected
- by fib_lookup.
+ * by fib_lookup.
*/
tun_info = skb_tunnel_info(skb);
u8 tos, struct net_device *dev, struct fib_result *res)
{
/* Multicast recognition logic is moved from route cache to here.
- The problem was that too many Ethernet cards have broken/missing
- hardware multicast filters :-( As result the host on multicasting
- network acquires a lot of useless route cache entries, sort of
- SDR messages from all the world. Now we try to get rid of them.
- Really, provided software IP multicast filter is organized
- reasonably (at least, hashed), it does not result in a slowdown
- comparing with route cache reject entries.
- Note, that multicast routers are not affected, because
- route cache entry is created eventually.
+ * The problem was that too many Ethernet cards have broken/missing
+ * hardware multicast filters :-( As result the host on multicasting
+ * network acquires a lot of useless route cache entries, sort of
+ * SDR messages from all the world. Now we try to get rid of them.
+ * Really, provided software IP multicast filter is organized
+ * reasonably (at least, hashed), it does not result in a slowdown
+ * comparing with route cache reject entries.
+ * Note, that multicast routers are not affected, because
+ * route cache entry is created eventually.
*/
if (ipv4_is_multicast(daddr)) {
struct in_device *in_dev = __in_dev_get_rcu(dev);
rth = ERR_PTR(-ENETUNREACH);
/* I removed check for oif == dev_out->oif here.
- It was wrong for two reasons:
- 1. ip_dev_find(net, saddr) can return wrong iface, if saddr
- is assigned to multiple interfaces.
- 2. Moreover, we are allowed to send packets with saddr
- of another iface. --ANK
+ * It was wrong for two reasons:
+ * 1. ip_dev_find(net, saddr) can return wrong iface, if saddr
+ * is assigned to multiple interfaces.
+ * 2. Moreover, we are allowed to send packets with saddr
+ * of another iface. --ANK
*/
if (fl4->flowi4_oif == 0 &&
goto out;
/* Special hack: user can direct multicasts
- and limited broadcast via necessary interface
- without fiddling with IP_MULTICAST_IF or IP_PKTINFO.
- This hack is not just for fun, it allows
- vic,vat and friends to work.
- They bind socket to loopback, set ttl to zero
- and expect that it will work.
- From the viewpoint of routing cache they are broken,
- because we are not allowed to build multicast path
- with loopback source addr (look, routing cache
- cannot know, that ttl is zero, so that packet
- will not leave this host and route is valid).
- Luckily, this hack is good workaround.
+ * and limited broadcast via necessary interface
+ * without fiddling with IP_MULTICAST_IF or IP_PKTINFO.
+ * This hack is not just for fun, it allows
+ * vic,vat and friends to work.
+ * They bind socket to loopback, set ttl to zero
+ * and expect that it will work.
+ * From the viewpoint of routing cache they are broken,
+ * because we are not allowed to build multicast path
+ * with loopback source addr (look, routing cache
+ * cannot know, that ttl is zero, so that packet
+ * will not leave this host and route is valid).
+ * Luckily, this hack is good workaround.
*/
fl4->flowi4_oif = dev_out->ifindex;
(ipv4_is_multicast(fl4->daddr) ||
!netif_index_is_l3_master(net, fl4->flowi4_oif))) {
/* Apparently, routing tables are wrong. Assume,
- that the destination is on link.
-
- WHY? DW.
- Because we are allowed to send to iface
- even if it has NO routes and NO assigned
- addresses. When oif is specified, routing
- tables are looked up with only one purpose:
- to catch if destination is gatewayed, rather than
- direct. Moreover, if MSG_DONTROUTE is set,
- we send packet, ignoring both routing tables
- and ifaddr state. --ANK
-
-
- We could make it even if oif is unknown,
- likely IPv6, but we do not.
+ * that the destination is on link.
+ *
+ * WHY? DW.
+ * Because we are allowed to send to iface
+ * even if it has NO routes and NO assigned
+ * addresses. When oif is specified, routing
+ * tables are looked up with only one purpose:
+ * to catch if destination is gatewayed, rather than
+ * direct. Moreover, if MSG_DONTROUTE is set,
+ * we send packet, ignoring both routing tables
+ * and ifaddr state. --ANK
+ *
+ *
+ * We could make it even if oif is unknown,
+ * likely IPv6, but we do not.
*/
if (fl4->saddr == 0)