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| author | Shmulik Ladkani <shmulik.ladkani@gmail.com> | 2012-04-01 04:03:45 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-01 17:29:40 -0400 |
| commit | 72331bc0cd072c3f4b670cd1256e47681fc53b80 (patch) | |
| tree | 46665ad2830342d94b4d784c5aa397e3a6f0045b /net/ipv6 | |
| parent | cdaf0b835df04177397b90214f8b457fd23b67e0 (diff) | |
| download | linux-72331bc0cd072c3f4b670cd1256e47681fc53b80.tar.gz linux-72331bc0cd072c3f4b670cd1256e47681fc53b80.tar.bz2 linux-72331bc0cd072c3f4b670cd1256e47681fc53b80.zip | |
ipv6: Fix RTM_GETROUTE's interpretation of RTA_IIF to be consistent with ipv4
In IPv4, if an RTA_IIF attribute is specified within an RTM_GETROUTE
message, then a route is searched as if a packet was received on the
specified 'iif' interface.
However in IPv6, RTA_IIF is not interpreted in the same way:
'inet6_rtm_getroute()' always calls 'ip6_route_output()', regardless the
RTA_IIF attribute.
As a result, in IPv6 there's no way to use RTM_GETROUTE in order to look
for a route as if a packet was received on a specific interface.
Fix 'inet6_rtm_getroute()' so that RTA_IIF is interpreted as "lookup a
route as if a packet was received on the specified interface", similar
to IPv4's 'inet_rtm_getroute()' interpretation.
Reported-by: Ami Koren <amikoren@yahoo.com>
Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/route.c | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 496b62712fe8..3992e26a6039 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -881,6 +881,16 @@ static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table * return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); } +static struct dst_entry *ip6_route_input_lookup(struct net *net, + struct net_device *dev, + struct flowi6 *fl6, int flags) +{ + if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) + flags |= RT6_LOOKUP_F_IFACE; + + return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); +} + void ip6_route_input(struct sk_buff *skb) { const struct ipv6hdr *iph = ipv6_hdr(skb); @@ -895,10 +905,7 @@ void ip6_route_input(struct sk_buff *skb) .flowi6_proto = iph->nexthdr, }; - if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) - flags |= RT6_LOOKUP_F_IFACE; - - skb_dst_set(skb, fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_input)); + skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); } static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, @@ -2537,7 +2544,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void struct sk_buff *skb; struct rtmsg *rtm; struct flowi6 fl6; - int err, iif = 0; + int err, iif = 0, oif = 0; err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); if (err < 0) @@ -2564,15 +2571,29 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void iif = nla_get_u32(tb[RTA_IIF]); if (tb[RTA_OIF]) - fl6.flowi6_oif = nla_get_u32(tb[RTA_OIF]); + oif = nla_get_u32(tb[RTA_OIF]); if (iif) { struct net_device *dev; + int flags = 0; + dev = __dev_get_by_index(net, iif); if (!dev) { err = -ENODEV; goto errout; } + + fl6.flowi6_iif = iif; + + if (!ipv6_addr_any(&fl6.saddr)) + flags |= RT6_LOOKUP_F_HAS_SADDR; + + rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, + flags); + } else { + fl6.flowi6_oif = oif; + + rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); } skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); @@ -2587,7 +2608,6 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void skb_reset_mac_header(skb); skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); - rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl6); skb_dst_set(skb, &rt->dst); err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |