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Diffstat (limited to 'net/ipv4/route.c')
-rw-r--r--net/ipv4/route.c153
1 files changed, 113 insertions, 40 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index ac3b22bc51b2..45ad2585eb28 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1992,8 +1992,13 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
fl4.saddr = saddr;
fl4.flowi4_uid = sock_net_uid(net, NULL);
- if (fib4_rules_early_flow_dissect(net, skb, &fl4, &_flkeys))
+ if (fib4_rules_early_flow_dissect(net, skb, &fl4, &_flkeys)) {
flkeys = &_flkeys;
+ } else {
+ fl4.flowi4_proto = 0;
+ fl4.fl4_sport = 0;
+ fl4.fl4_dport = 0;
+ }
err = fib_lookup(net, &fl4, res, 0);
if (err != 0) {
@@ -2600,11 +2605,10 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,
EXPORT_SYMBOL_GPL(ip_route_output_flow);
/* called with rcu_read_lock held */
-static int rt_fill_info(struct net *net, __be32 dst, __be32 src, u32 table_id,
- struct flowi4 *fl4, struct sk_buff *skb, u32 portid,
- u32 seq)
+static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
+ struct rtable *rt, u32 table_id, struct flowi4 *fl4,
+ struct sk_buff *skb, u32 portid, u32 seq)
{
- struct rtable *rt = skb_rtable(skb);
struct rtmsg *r;
struct nlmsghdr *nlh;
unsigned long expires = 0;
@@ -2700,7 +2704,7 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src, u32 table_id,
}
} else
#endif
- if (nla_put_u32(skb, RTA_IIF, skb->dev->ifindex))
+ if (nla_put_u32(skb, RTA_IIF, fl4->flowi4_iif))
goto nla_put_failure;
}
@@ -2715,43 +2719,93 @@ nla_put_failure:
return -EMSGSIZE;
}
+static struct sk_buff *inet_rtm_getroute_build_skb(__be32 src, __be32 dst,
+ u8 ip_proto, __be16 sport,
+ __be16 dport)
+{
+ struct sk_buff *skb;
+ struct iphdr *iph;
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!skb)
+ return NULL;
+
+ /* Reserve room for dummy headers, this skb can pass
+ * through good chunk of routing engine.
+ */
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+ skb->protocol = htons(ETH_P_IP);
+ iph = skb_put(skb, sizeof(struct iphdr));
+ iph->protocol = ip_proto;
+ iph->saddr = src;
+ iph->daddr = dst;
+ iph->version = 0x4;
+ iph->frag_off = 0;
+ iph->ihl = 0x5;
+ skb_set_transport_header(skb, skb->len);
+
+ switch (iph->protocol) {
+ case IPPROTO_UDP: {
+ struct udphdr *udph;
+
+ udph = skb_put_zero(skb, sizeof(struct udphdr));
+ udph->source = sport;
+ udph->dest = dport;
+ udph->len = sizeof(struct udphdr);
+ udph->check = 0;
+ break;
+ }
+ case IPPROTO_TCP: {
+ struct tcphdr *tcph;
+
+ tcph = skb_put_zero(skb, sizeof(struct tcphdr));
+ tcph->source = sport;
+ tcph->dest = dport;
+ tcph->doff = sizeof(struct tcphdr) / 4;
+ tcph->rst = 1;
+ tcph->check = ~tcp_v4_check(sizeof(struct tcphdr),
+ src, dst, 0);
+ break;
+ }
+ case IPPROTO_ICMP: {
+ struct icmphdr *icmph;
+
+ icmph = skb_put_zero(skb, sizeof(struct icmphdr));
+ icmph->type = ICMP_ECHO;
+ icmph->code = 0;
+ }
+ }
+
+ return skb;
+}
+
static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(in_skb->sk);
- struct rtmsg *rtm;
struct nlattr *tb[RTA_MAX+1];
+ u32 table_id = RT_TABLE_MAIN;
+ __be16 sport = 0, dport = 0;
struct fib_result res = {};
+ u8 ip_proto = IPPROTO_UDP;
struct rtable *rt = NULL;
+ struct sk_buff *skb;
+ struct rtmsg *rtm;
struct flowi4 fl4;
__be32 dst = 0;
__be32 src = 0;
+ kuid_t uid;
u32 iif;
int err;
int mark;
- struct sk_buff *skb;
- u32 table_id = RT_TABLE_MAIN;
- kuid_t uid;
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy,
extack);
if (err < 0)
- goto errout;
+ return err;
rtm = nlmsg_data(nlh);
-
- skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
- if (!skb) {
- err = -ENOBUFS;
- goto errout;
- }
-
- /* Reserve room for dummy headers, this skb can pass
- through good chunk of routing engine.
- */
- skb_reset_mac_header(skb);
- skb_reset_network_header(skb);
-
src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0;
@@ -2761,14 +2815,22 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
else
uid = (iif ? INVALID_UID : current_uid());
- /* Bugfix: need to give ip_route_input enough of an IP header to
- * not gag.
- */
- ip_hdr(skb)->protocol = IPPROTO_UDP;
- ip_hdr(skb)->saddr = src;
- ip_hdr(skb)->daddr = dst;
+ if (tb[RTA_IP_PROTO]) {
+ err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
+ &ip_proto, extack);
+ if (err)
+ return err;
+ }
+
+ if (tb[RTA_SPORT])
+ sport = nla_get_be16(tb[RTA_SPORT]);
- skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr));
+ if (tb[RTA_DPORT])
+ dport = nla_get_be16(tb[RTA_DPORT]);
+
+ skb = inet_rtm_getroute_build_skb(src, dst, ip_proto, sport, dport);
+ if (!skb)
+ return -ENOBUFS;
memset(&fl4, 0, sizeof(fl4));
fl4.daddr = dst;
@@ -2777,6 +2839,11 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0;
fl4.flowi4_mark = mark;
fl4.flowi4_uid = uid;
+ if (sport)
+ fl4.fl4_sport = sport;
+ if (dport)
+ fl4.fl4_dport = dport;
+ fl4.flowi4_proto = ip_proto;
rcu_read_lock();
@@ -2786,10 +2853,10 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
dev = dev_get_by_index_rcu(net, iif);
if (!dev) {
err = -ENODEV;
- goto errout_free;
+ goto errout_rcu;
}
- skb->protocol = htons(ETH_P_IP);
+ fl4.flowi4_iif = iif; /* for rt_fill_info */
skb->dev = dev;
skb->mark = mark;
err = ip_route_input_rcu(skb, dst, src, rtm->rtm_tos,
@@ -2809,7 +2876,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
}
if (err)
- goto errout_free;
+ goto errout_rcu;
if (rtm->rtm_flags & RTM_F_NOTIFY)
rt->rt_flags |= RTCF_NOTIFY;
@@ -2817,34 +2884,40 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
if (rtm->rtm_flags & RTM_F_LOOKUP_TABLE)
table_id = res.table ? res.table->tb_id : 0;
+ /* reset skb for netlink reply msg */
+ skb_trim(skb, 0);
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+ skb_reset_mac_header(skb);
+
if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
if (!res.fi) {
err = fib_props[res.type].error;
if (!err)
err = -EHOSTUNREACH;
- goto errout_free;
+ goto errout_rcu;
}
err = fib_dump_info(skb, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, RTM_NEWROUTE, table_id,
rt->rt_type, res.prefix, res.prefixlen,
fl4.flowi4_tos, res.fi, 0);
} else {
- err = rt_fill_info(net, dst, src, table_id, &fl4, skb,
+ err = rt_fill_info(net, dst, src, rt, table_id, &fl4, skb,
NETLINK_CB(in_skb).portid, nlh->nlmsg_seq);
}
if (err < 0)
- goto errout_free;
+ goto errout_rcu;
rcu_read_unlock();
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
-errout:
- return err;
errout_free:
+ return err;
+errout_rcu:
rcu_read_unlock();
kfree_skb(skb);
- goto errout;
+ goto errout_free;
}
void ip_rt_multicast_event(struct in_device *in_dev)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.