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git-svn-id: http://svn.eurecom.fr/openair4G/trunk@6239 818b1a75-f10b-46b9-bf7c-635c3b92a50f

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This commit is contained in:
Lionel Gauthier
2014-12-10 17:59:52 +00:00
parent dc906ca870
commit 97fdaa3800
1 changed files with 69 additions and 63 deletions
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openair-cn/GTPV1-U/GTPUAH/xt_GTPUAH.c
+69 -63
View File
@@ -19,9 +19,9 @@
#include <linux/route.h>
#include <linux/time.h>
#include <net/checksum.h>
#include <net/ip.h>
#include <net/udp.h>
#include <net/inet_sock.h>
#include <net/ip.h>
#include <net/route.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
@@ -39,7 +39,6 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pradip Biswas <pradip_biswas@polarisnetworks.net>");
MODULE_DESCRIPTION("GTPu Data Path extension on netfilter");
struct gtpuhdr
{
char flags;
@@ -62,11 +61,11 @@ struct gtpuhdr
#define IP_MORE_FRAGMENTS 0x2000
static bool _gtpuah_route_packet(struct sk_buff *skb, const struct xt_gtpuah_target_info *info)
static bool _gtpuah_route_packet(struct sk_buff *skb_pP, const struct xt_gtpuah_target_info *info_pP, char *in_dev_pP)
{
int err = 0;
struct rtable *rt = NULL;
struct iphdr *iph = ip_hdr(skb);
struct iphdr *iph = ip_hdr(skb_pP);
int daddr = iph->daddr;
struct flowi fl = {
.u = {
@@ -78,7 +77,7 @@ static bool _gtpuah_route_packet(struct sk_buff *skb, const struct xt_gtpuah_tar
}
};
#if 0
#if 1
int flags, offset;
offset = ntohs(iph->frag_off);
@@ -87,7 +86,7 @@ static bool _gtpuah_route_packet(struct sk_buff *skb, const struct xt_gtpuah_tar
offset <<= 3;
pr_info("GTPUAH(%d): Routing %s packet: %d.%d.%d.%d --> %d.%d.%d.%d Proto: %d, Len: %05u, Id %04X, Offset %u, Flags %04X, Mark: %u\n",
info->action,
info_pP->action,
(ip_is_fragment(iph) == 0) ? "":"fragmented",
iph->saddr & 0xFF,
(iph->saddr & 0x0000FF00) >> 8,
@@ -102,38 +101,44 @@ static bool _gtpuah_route_packet(struct sk_buff *skb, const struct xt_gtpuah_tar
ntohs(iph->id),
offset,
flags,
skb->mark);
skb_pP->mark);
#endif
rt = ip_route_output_key(&init_net, &fl.u.ip4);
if (err != 0)
{
pr_info("GTPU: Failed to route packet to dst 0x%x. Error: (%d)", fl.u.ip4.daddr, err);
return GTPU_FAILURE;
}
if (in_dev_pP) {
if (strcasecmp(in_dev_pP, "lo") == 0) {
struct inet_sock *inet = inet_sk(skb_pP->sk);
ip_queue_xmit(&inet->sk, skb_pP, &fl);
} else {
rt = ip_route_output_key(&init_net, &fl.u.ip4);
if (err != 0)
{
pr_info("GTPU: Failed to route packet to dst 0x%x. Error: (%d)", fl.u.ip4.daddr, err);
return GTPU_FAILURE;
}
#if 0
if (rt->dst.dev)
{
pr_info("GTPU: dst dev name %s\n", rt->dst.dev->name);
}
else
{
pr_info("GTPU: dst dev NULL\n");
}
#endif
#if 1
if (rt->dst.dev)
{
pr_info("GTPU: dst dev name %s\n", rt->dst.dev->name);
}
else
{
pr_info("GTPU: dst dev NULL\n");
}
#endif
//if (info->action == PARAM_GTPUAH_ACTION_ADD) //LG was commented
{
skb_dst_drop(skb);
skb_dst_set(skb, &rt->dst);
skb->dev = skb_dst(skb)->dev;
//if (info_pP->action == PARAM_GTPUAH_ACTION_ADD) //LG was commented
{
skb_dst_drop(skb_pP);
skb_dst_set(skb_pP, &rt->dst);
skb_pP->dev = skb_dst(skb_pP)->dev;
}
skb_pP->protocol = htons(ETH_P_IP);
/* Send the GTPu message out...gggH */
err = dst_output(skb_pP); }
}
skb->protocol = htons(ETH_P_IP);
/* Send the GTPu message out...gggH */
err = dst_output(skb);
if (err == 0)
{
@@ -146,9 +151,9 @@ static bool _gtpuah_route_packet(struct sk_buff *skb, const struct xt_gtpuah_tar
}
static unsigned int
_gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
_gtpuah_target_add(struct sk_buff *skb_pP, const struct xt_gtpuah_target_info *tgi_pP, char *in_dev_pP)
{
struct iphdr *iph = ip_hdr(skb);
struct iphdr *iph = ip_hdr(skb_pP);
struct iphdr *iph2 = NULL;
struct udphdr *udph = NULL;
struct gtpuhdr *gtpuh = NULL;
@@ -160,9 +165,9 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
payload_to_send = 0, bytes_to_remove = 0, bytes_to_send = 0;
int flags = 0, offset = 0, offset2 = 0;
if (skb->mark == 0) {
pr_info("GTPUAH: _gtpuah_target_add force skb mark %u to tgi mark %u", skb->mark, tgi->rtun);
skb->mark = tgi->rtun;
if (skb_pP->mark == 0) {
pr_info("GTPUAH: _gtpuah_target_add force info_pP mark %u to skb_pP mark %u", skb_pP->mark, tgi_pP->rtun);
skb_pP->mark = tgi_pP->rtun;
}
/* Keep the length of the source IP packet */
orig_iplen = ntohs(iph->tot_len);
@@ -173,12 +178,12 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
/* Create a new copy of the original skb...can't avoid :-( */
if (((orig_iplen + headroom_reqd) <= MTU) || (flags & IP_DF)) {
#if 0
#if 1
if (flags & IP_DF) {
pr_info("GTPUAH: DONT FRAGMENT id %04X", ntohs(iph->id));
}
#endif
new_skb = skb_copy_expand(skb, headroom_reqd + skb_headroom(skb), skb_tailroom(skb), GFP_ATOMIC);
new_skb = skb_copy_expand(skb_pP, headroom_reqd + skb_headroom(skb_pP), skb_tailroom(skb_pP), GFP_ATOMIC);
if (new_skb == NULL)
{
return NF_ACCEPT;
@@ -188,7 +193,7 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
gtpuh->flags = 0x30; /* v1 and Protocol-type=GTP */
gtpuh->msgtype = 0xff; /* T-PDU */
gtpuh->length = htons(orig_iplen);
gtpuh->tunid = htonl(skb->mark);
gtpuh->tunid = htonl(skb_pP->mark);
/* Add UDP header */
udp_len = sizeof(struct udphdr) + sizeof(struct gtpuhdr) + orig_iplen;
@@ -197,8 +202,8 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
udph->dest = htons(GTPU_PORT);
udph->len = htons(udp_len);
udph->check = 0;
udph->check = csum_tcpudp_magic(tgi->laddr,
tgi->raddr,
udph->check = csum_tcpudp_magic(tgi_pP->laddr,
tgi_pP->raddr,
udp_len,
IPPROTO_UDP,
csum_partial((char*)udph, udp_len, 0));
@@ -215,14 +220,14 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
iph->frag_off = 0;
iph->ttl = 64;
iph->protocol = IPPROTO_UDP;
iph->saddr = (tgi->laddr);
iph->daddr = (tgi->raddr);
iph->saddr = (tgi_pP->laddr);
iph->daddr = (tgi_pP->raddr);
iph->check = 0;
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
skb_set_network_header(new_skb, 0);
/* Route the packet */
if (_gtpuah_route_packet(new_skb, tgi) == GTPU_SUCCESS)
if (_gtpuah_route_packet(new_skb, tgi_pP, in_dev_pP) == GTPU_SUCCESS)
{
/* Succeeded. Drop the original packet */
return NF_DROP;
@@ -233,7 +238,7 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
return NF_ACCEPT; /* What should we do here ??? ACCEPT seems to be the best option */
}
} else {
new_skb = skb_copy_expand(skb, headroom_reqd + skb_headroom(skb), 0, GFP_ATOMIC);
new_skb = skb_copy_expand(skb_pP, headroom_reqd + skb_headroom(skb_pP), 0, GFP_ATOMIC);
if (new_skb == NULL)
{
return NF_ACCEPT;
@@ -250,7 +255,7 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
gtpuh->flags = 0x30; /* v1 and Protocol-type=GTP */
gtpuh->msgtype = 0xff; /* T-PDU */
gtpuh->length = htons(orig_iplen);
gtpuh->tunid = htonl(skb->mark);
gtpuh->tunid = htonl(skb_pP->mark);
/* Add UDP header */
udp_len = sizeof(struct udphdr) + sizeof(struct gtpuhdr) + orig_iplen;
@@ -259,8 +264,8 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
udph->dest = htons(GTPU_PORT);
udph->len = htons(udp_len);
udph->check = 0;
udph->check = csum_tcpudp_magic(tgi->laddr,
tgi->raddr,
udph->check = csum_tcpudp_magic(tgi_pP->laddr,
tgi_pP->raddr,
udp_len,
IPPROTO_UDP,
csum_partial((char*)udph, udp_len, 0));
@@ -277,8 +282,8 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
iph->frag_off = htons(IP_MORE_FRAGMENTS);
iph->ttl = 64;
iph->protocol = IPPROTO_UDP;
iph->saddr = (tgi->laddr);
iph->daddr = (tgi->raddr);
iph->saddr = (tgi_pP->laddr);
iph->daddr = (tgi_pP->raddr);
iph->check = 0;
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
skb_set_network_header(new_skb, 0);
@@ -286,7 +291,7 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
skb_trim(new_skb, MTU - headroom_reqd);
/* Route the packet */
if (_gtpuah_route_packet(new_skb, tgi) == GTPU_SUCCESS)
if (_gtpuah_route_packet(new_skb, tgi_pP, in_dev_pP) == GTPU_SUCCESS)
{
remaining_payload_to_send = orig_iplen - MTU + headroom_reqd;
remaining_bytes_to_send = remaining_payload_to_send + sizeof(struct iphdr);
@@ -308,7 +313,7 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
payload_to_send,
bytes_to_send);
// Not optimal, TO OPTIMIZE copies
new_skb2 = skb_copy(skb, GFP_ATOMIC);
new_skb2 = skb_copy(skb_pP, GFP_ATOMIC);
skb_pull(new_skb2, bytes_to_remove);
/* Add IP header */
iph2 = (struct iphdr*)skb_push(new_skb2, sizeof(struct iphdr));
@@ -320,14 +325,14 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
iph2->frag_off = htons(offset2 / 8);
iph2->ttl = 64;
iph2->protocol = IPPROTO_UDP;
iph2->saddr = (tgi->laddr);
iph2->daddr = (tgi->raddr);
iph2->saddr = (tgi_pP->laddr);
iph2->daddr = (tgi_pP->raddr);
iph2->check = 0;
iph2->check = ip_fast_csum((unsigned char *)iph2, iph2->ihl);
skb_set_network_header(new_skb2, 0);
skb_trim(new_skb2, MTU);
_gtpuah_route_packet(new_skb2, tgi);
_gtpuah_route_packet(new_skb2, tgi_pP, in_dev_pP);
remaining_payload_to_send = remaining_payload_to_send - payload_to_send;
bytes_to_remove = bytes_to_remove + payload_to_send;
@@ -346,19 +351,19 @@ _gtpuah_target_add(struct sk_buff *skb, const struct xt_gtpuah_target_info *tgi)
static unsigned int
xt_gtpuah_target(struct sk_buff *skb, const struct xt_action_param *par)
xt_gtpuah_target(struct sk_buff *skb_pP, const struct xt_action_param *par_pP)
{
const struct xt_gtpuah_target_info *tgi = par->targinfo;
const struct xt_gtpuah_target_info *tgi_p = par_pP->targinfo;
int result = NF_ACCEPT;
if (tgi == NULL)
if (tgi_p == NULL)
{
return result;
}
if (tgi->action == PARAM_GTPUAH_ACTION_ADD)
if (tgi_p->action == PARAM_GTPUAH_ACTION_ADD)
{
result = _gtpuah_target_add(skb, tgi);
result = _gtpuah_target_add(skb_pP, tgi_p, par_pP->in->name);
}
return result;
}
@@ -368,8 +373,9 @@ static struct xt_target xt_gtpuah_reg __read_mostly =
.name = "GTPUAH",
.revision = 0,
.family = AF_INET,
.hooks = (1 << NF_INET_FORWARD) |
(1 << NF_INET_POST_ROUTING),
.hooks = (1 << NF_INET_FORWARD) |
(1 << NF_INET_POST_ROUTING) |
(1 << NF_INET_LOCAL_OUT),
.table = "mangle",
.target = xt_gtpuah_target,
.targetsize = sizeof(struct xt_gtpuah_target_info),