__be32 times[3];
} data;
int head_len;
- struct ip_options replyopts;
- unsigned char optbuf[40];
+ struct ip_options_data replyopts;
};
/* An array of errno for error messages from dest unreach. */
* Send an ICMP frame.
*/
-/*
- * Check transmit rate limitation for given message.
- * The rate information is held in the destination cache now.
- * This function is generic and could be used for other purposes
- * too. It uses a Token bucket filter as suggested by Alexey Kuznetsov.
- *
- * Note that the same dst_entry fields are modified by functions in
- * route.c too, but these work for packet destinations while xrlim_allow
- * works for icmp destinations. This means the rate limiting information
- * for one "ip object" is shared - and these ICMPs are twice limited:
- * by source and by destination.
- *
- * RFC 1812: 4.3.2.8 SHOULD be able to limit error message rate
- * SHOULD allow setting of rate limits
- *
- * Shared between ICMPv4 and ICMPv6.
- */
-#define XRLIM_BURST_FACTOR 6
-int xrlim_allow(struct dst_entry *dst, int timeout)
-{
- unsigned long now, token = dst->rate_tokens;
- int rc = 0;
-
- now = jiffies;
- token += now - dst->rate_last;
- dst->rate_last = now;
- if (token > XRLIM_BURST_FACTOR * timeout)
- token = XRLIM_BURST_FACTOR * timeout;
- if (token >= timeout) {
- token -= timeout;
- rc = 1;
- }
- dst->rate_tokens = token;
- return rc;
-}
-EXPORT_SYMBOL(xrlim_allow);
-
-static inline int icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
+static inline bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
int type, int code)
{
struct dst_entry *dst = &rt->dst;
- int rc = 1;
+ bool rc = true;
if (type > NR_ICMP_TYPES)
goto out;
goto out;
/* Limit if icmp type is enabled in ratemask. */
- if ((1 << type) & net->ipv4.sysctl_icmp_ratemask)
- rc = xrlim_allow(dst, net->ipv4.sysctl_icmp_ratelimit);
+ if ((1 << type) & net->ipv4.sysctl_icmp_ratemask) {
+ if (!rt->peer)
+ rt_bind_peer(rt, 1);
+ rc = inet_peer_xrlim_allow(rt->peer,
+ net->ipv4.sysctl_icmp_ratelimit);
+ }
out:
return rc;
}
}
static void icmp_push_reply(struct icmp_bxm *icmp_param,
+ struct flowi4 *fl4,
struct ipcm_cookie *ipc, struct rtable **rt)
{
struct sock *sk;
icmp_param->head_len, csum);
icmph->checksum = csum_fold(csum);
skb->ip_summed = CHECKSUM_NONE;
- ip_push_pending_frames(sk);
+ ip_push_pending_frames(sk, fl4);
}
}
struct ipcm_cookie ipc;
struct rtable *rt = skb_rtable(skb);
struct net *net = dev_net(rt->dst.dev);
+ struct flowi4 fl4;
struct sock *sk;
struct inet_sock *inet;
__be32 daddr;
- if (ip_options_echo(&icmp_param->replyopts, skb))
+ if (ip_options_echo(&icmp_param->replyopts.opt.opt, skb))
return;
sk = icmp_xmit_lock(net);
daddr = ipc.addr = rt->rt_src;
ipc.opt = NULL;
ipc.tx_flags = 0;
- if (icmp_param->replyopts.optlen) {
- ipc.opt = &icmp_param->replyopts;
- if (ipc.opt->srr)
- daddr = icmp_param->replyopts.faddr;
- }
- {
- struct flowi fl = { .fl4_dst= daddr,
- .fl4_src = rt->rt_spec_dst,
- .fl4_tos = RT_TOS(ip_hdr(skb)->tos),
- .proto = IPPROTO_ICMP };
- security_skb_classify_flow(skb, &fl);
- if (ip_route_output_key(net, &rt, &fl))
- goto out_unlock;
+ if (icmp_param->replyopts.opt.opt.optlen) {
+ ipc.opt = &icmp_param->replyopts.opt;
+ if (ipc.opt->opt.srr)
+ daddr = icmp_param->replyopts.opt.opt.faddr;
}
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.daddr = daddr;
+ fl4.saddr = rt->rt_spec_dst;
+ fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
+ fl4.flowi4_proto = IPPROTO_ICMP;
+ security_skb_classify_flow(skb, flowi4_to_flowi(&fl4));
+ rt = ip_route_output_key(net, &fl4);
+ if (IS_ERR(rt))
+ goto out_unlock;
if (icmpv4_xrlim_allow(net, rt, icmp_param->data.icmph.type,
icmp_param->data.icmph.code))
- icmp_push_reply(icmp_param, &ipc, &rt);
+ icmp_push_reply(icmp_param, &fl4, &ipc, &rt);
ip_rt_put(rt);
out_unlock:
icmp_xmit_unlock(sk);
}
+static struct rtable *icmp_route_lookup(struct net *net,
+ struct flowi4 *fl4,
+ struct sk_buff *skb_in,
+ const struct iphdr *iph,
+ __be32 saddr, u8 tos,
+ int type, int code,
+ struct icmp_bxm *param)
+{
+ struct rtable *rt, *rt2;
+ int err;
+
+ memset(fl4, 0, sizeof(*fl4));
+ fl4->daddr = (param->replyopts.opt.opt.srr ?
+ param->replyopts.opt.opt.faddr : iph->saddr);
+ fl4->saddr = saddr;
+ fl4->flowi4_tos = RT_TOS(tos);
+ fl4->flowi4_proto = IPPROTO_ICMP;
+ fl4->fl4_icmp_type = type;
+ fl4->fl4_icmp_code = code;
+ security_skb_classify_flow(skb_in, flowi4_to_flowi(fl4));
+ rt = __ip_route_output_key(net, fl4);
+ if (IS_ERR(rt))
+ return rt;
+
+ /* No need to clone since we're just using its address. */
+ rt2 = rt;
+
+ rt = (struct rtable *) xfrm_lookup(net, &rt->dst,
+ flowi4_to_flowi(fl4), NULL, 0);
+ if (!IS_ERR(rt)) {
+ if (rt != rt2)
+ return rt;
+ } else if (PTR_ERR(rt) == -EPERM) {
+ rt = NULL;
+ } else
+ return rt;
+
+ err = xfrm_decode_session_reverse(skb_in, flowi4_to_flowi(fl4), AF_INET);
+ if (err)
+ goto relookup_failed;
+
+ if (inet_addr_type(net, fl4->saddr) == RTN_LOCAL) {
+ rt2 = __ip_route_output_key(net, fl4);
+ if (IS_ERR(rt2))
+ err = PTR_ERR(rt2);
+ } else {
+ struct flowi4 fl4_2 = {};
+ unsigned long orefdst;
+
+ fl4_2.daddr = fl4->saddr;
+ rt2 = ip_route_output_key(net, &fl4_2);
+ if (IS_ERR(rt2)) {
+ err = PTR_ERR(rt2);
+ goto relookup_failed;
+ }
+ /* Ugh! */
+ orefdst = skb_in->_skb_refdst; /* save old refdst */
+ err = ip_route_input(skb_in, fl4->daddr, fl4->saddr,
+ RT_TOS(tos), rt2->dst.dev);
+
+ dst_release(&rt2->dst);
+ rt2 = skb_rtable(skb_in);
+ skb_in->_skb_refdst = orefdst; /* restore old refdst */
+ }
+
+ if (err)
+ goto relookup_failed;
+
+ rt2 = (struct rtable *) xfrm_lookup(net, &rt2->dst,
+ flowi4_to_flowi(fl4), NULL,
+ XFRM_LOOKUP_ICMP);
+ if (!IS_ERR(rt2)) {
+ dst_release(&rt->dst);
+ rt = rt2;
+ } else if (PTR_ERR(rt2) == -EPERM) {
+ if (rt)
+ dst_release(&rt->dst);
+ return rt2;
+ } else {
+ err = PTR_ERR(rt2);
+ goto relookup_failed;
+ }
+ return rt;
+
+relookup_failed:
+ if (rt)
+ return rt;
+ return ERR_PTR(err);
+}
/*
* Send an ICMP message in response to a situation
struct icmp_bxm icmp_param;
struct rtable *rt = skb_rtable(skb_in);
struct ipcm_cookie ipc;
+ struct flowi4 fl4;
__be32 saddr;
u8 tos;
struct net *net;
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->fl.iif);
+ dev = dev_get_by_index_rcu(net, rt->rt_iif);
if (dev)
saddr = inet_select_addr(dev, 0, RT_SCOPE_LINK);
IPTOS_PREC_INTERNETCONTROL) :
iph->tos;
- if (ip_options_echo(&icmp_param.replyopts, skb_in))
+ if (ip_options_echo(&icmp_param.replyopts.opt.opt, skb_in))
goto out_unlock;
icmp_param.offset = skb_network_offset(skb_in);
inet_sk(sk)->tos = tos;
ipc.addr = iph->saddr;
- ipc.opt = &icmp_param.replyopts;
+ ipc.opt = &icmp_param.replyopts.opt;
ipc.tx_flags = 0;
- {
- struct flowi fl = {
- .fl4_dst = icmp_param.replyopts.srr ?
- icmp_param.replyopts.faddr : iph->saddr,
- .fl4_src = saddr,
- .fl4_tos = RT_TOS(tos),
- .proto = IPPROTO_ICMP,
- .fl_icmp_type = type,
- .fl_icmp_code = code,
- };
- int err;
- struct rtable *rt2;
-
- security_skb_classify_flow(skb_in, &fl);
- if (__ip_route_output_key(net, &rt, &fl))
- goto out_unlock;
-
- /* No need to clone since we're just using its address. */
- rt2 = rt;
-
- if (!fl.nl_u.ip4_u.saddr)
- fl.nl_u.ip4_u.saddr = rt->rt_src;
-
- err = xfrm_lookup(net, (struct dst_entry **)&rt, &fl, NULL, 0);
- switch (err) {
- case 0:
- if (rt != rt2)
- goto route_done;
- break;
- case -EPERM:
- rt = NULL;
- break;
- default:
- goto out_unlock;
- }
-
- if (xfrm_decode_session_reverse(skb_in, &fl, AF_INET))
- goto relookup_failed;
-
- if (inet_addr_type(net, fl.fl4_src) == RTN_LOCAL)
- err = __ip_route_output_key(net, &rt2, &fl);
- else {
- struct flowi fl2 = {};
- unsigned long orefdst;
-
- fl2.fl4_dst = fl.fl4_src;
- if (ip_route_output_key(net, &rt2, &fl2))
- goto relookup_failed;
-
- /* Ugh! */
- orefdst = skb_in->_skb_refdst; /* save old refdst */
- err = ip_route_input(skb_in, fl.fl4_dst, fl.fl4_src,
- RT_TOS(tos), rt2->dst.dev);
-
- dst_release(&rt2->dst);
- rt2 = skb_rtable(skb_in);
- skb_in->_skb_refdst = orefdst; /* restore old refdst */
- }
-
- if (err)
- goto relookup_failed;
-
- err = xfrm_lookup(net, (struct dst_entry **)&rt2, &fl, NULL,
- XFRM_LOOKUP_ICMP);
- switch (err) {
- case 0:
- dst_release(&rt->dst);
- rt = rt2;
- break;
- case -EPERM:
- goto ende;
- default:
-relookup_failed:
- if (!rt)
- goto out_unlock;
- break;
- }
- }
+ rt = icmp_route_lookup(net, &fl4, skb_in, iph, saddr, tos,
+ type, code, &icmp_param);
+ if (IS_ERR(rt))
+ goto out_unlock;
-route_done:
if (!icmpv4_xrlim_allow(net, rt, type, code))
goto ende;
room = dst_mtu(&rt->dst);
if (room > 576)
room = 576;
- room -= sizeof(struct iphdr) + icmp_param.replyopts.optlen;
+ room -= sizeof(struct iphdr) + icmp_param.replyopts.opt.opt.optlen;
room -= sizeof(struct icmphdr);
icmp_param.data_len = skb_in->len - icmp_param.offset;
icmp_param.data_len = room;
icmp_param.head_len = sizeof(struct icmphdr);
- icmp_push_reply(&icmp_param, &ipc, &rt);
+ icmp_push_reply(&icmp_param, &fl4, &ipc, &rt);
ende:
ip_rt_put(rt);
out_unlock:
static void icmp_unreach(struct sk_buff *skb)
{
- struct iphdr *iph;
+ const struct iphdr *iph;
struct icmphdr *icmph;
int hash, protocol;
const struct net_protocol *ipprot;
goto out_err;
icmph = icmp_hdr(skb);
- iph = (struct iphdr *)skb->data;
+ iph = (const struct iphdr *)skb->data;
if (iph->ihl < 5) /* Mangled header, drop. */
goto out_err;
*/
/*
- * Check the other end isnt violating RFC 1122. Some routers send
+ * Check the other end isn't violating RFC 1122. Some routers send
* bogus responses to broadcast frames. If you see this message
* first check your netmask matches at both ends, if it does then
* get the other vendor to fix their kit.
if (!pskb_may_pull(skb, iph->ihl * 4 + 8))
goto out;
- iph = (struct iphdr *)skb->data;
+ iph = (const struct iphdr *)skb->data;
protocol = iph->protocol;
/*
static void icmp_redirect(struct sk_buff *skb)
{
- struct iphdr *iph;
+ const struct iphdr *iph;
if (skb->len < sizeof(struct iphdr))
goto out_err;
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
goto out;
- iph = (struct iphdr *)skb->data;
+ iph = (const struct iphdr *)skb->data;
switch (icmp_hdr(skb)->code & 7) {
case ICMP_REDIR_NET:
git.openpandora.org / pandora-kernel.git / blobdiff