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[PKTGEN]: IPSEC support
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Added transport mode ESP support for starters.  I will send more of
these modes and types once i have resolved the tunnel mode isses.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Jamal Hadi Salim authored and David S. Miller committed Jul 11, 2007
1 parent 628529b commit a553e4a
Showing 1 changed file with 152 additions and 2 deletions.
154 changes: 152 additions & 2 deletions net/core/pktgen.c
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Original file line number Diff line number Diff line change
Expand Up @@ -152,6 +152,9 @@
#include <net/checksum.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#ifdef CONFIG_XFRM
#include <net/xfrm.h>
#endif
#include <asm/byteorder.h>
#include <linux/rcupdate.h>
#include <asm/bitops.h>
Expand Down Expand Up @@ -182,6 +185,7 @@
#define F_VID_RND (1<<9) /* Random VLAN ID */
#define F_SVID_RND (1<<10) /* Random SVLAN ID */
#define F_FLOW_SEQ (1<<11) /* Sequential flows */
#define F_IPSEC_ON (1<<12) /* ipsec on for flows */

/* Thread control flag bits */
#define T_TERMINATE (1<<0)
Expand All @@ -208,6 +212,9 @@ static struct proc_dir_entry *pg_proc_dir = NULL;
struct flow_state {
__be32 cur_daddr;
int count;
#ifdef CONFIG_XFRM
struct xfrm_state *x;
#endif
__u32 flags;
};

Expand Down Expand Up @@ -348,7 +355,10 @@ struct pktgen_dev {
unsigned lflow; /* Flow length (config) */
unsigned nflows; /* accumulated flows (stats) */
unsigned curfl; /* current sequenced flow (state)*/

#ifdef CONFIG_XFRM
__u8 ipsmode; /* IPSEC mode (config) */
__u8 ipsproto; /* IPSEC type (config) */
#endif
char result[512];
};

Expand Down Expand Up @@ -704,6 +714,11 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
seq_printf(seq, "FLOW_RND ");
}

#ifdef CONFIG_XFRM
if (pkt_dev->flags & F_IPSEC_ON)
seq_printf(seq, "IPSEC ");
#endif

if (pkt_dev->flags & F_MACSRC_RND)
seq_printf(seq, "MACSRC_RND ");

Expand Down Expand Up @@ -1198,6 +1213,11 @@ static ssize_t pktgen_if_write(struct file *file,
else if (strcmp(f, "FLOW_SEQ") == 0)
pkt_dev->flags |= F_FLOW_SEQ;

#ifdef CONFIG_XFRM
else if (strcmp(f, "IPSEC") == 0)
pkt_dev->flags |= F_IPSEC_ON;
#endif

else if (strcmp(f, "!IPV6") == 0)
pkt_dev->flags &= ~F_IPV6;

Expand All @@ -1206,7 +1226,7 @@ static ssize_t pktgen_if_write(struct file *file,
"Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
f,
"IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
"MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ\n");
"MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, IPSEC\n");
return count;
}
sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
Expand Down Expand Up @@ -2094,6 +2114,7 @@ static void spin(struct pktgen_dev *pkt_dev, __u64 spin_until_us)

static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
{
pkt_dev->pkt_overhead = 0;
pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
Expand Down Expand Up @@ -2130,6 +2151,31 @@ static inline int f_pick(struct pktgen_dev *pkt_dev)
return pkt_dev->curfl;
}


#ifdef CONFIG_XFRM
/* If there was already an IPSEC SA, we keep it as is, else
* we go look for it ...
*/
inline
void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow)
{
struct xfrm_state *x = pkt_dev->flows[flow].x;
if (!x) {
/*slow path: we dont already have xfrm_state*/
x = xfrm_stateonly_find((xfrm_address_t *)&pkt_dev->cur_daddr,
(xfrm_address_t *)&pkt_dev->cur_saddr,
AF_INET,
pkt_dev->ipsmode,
pkt_dev->ipsproto, 0);
if (x) {
pkt_dev->flows[flow].x = x;
set_pkt_overhead(pkt_dev);
pkt_dev->pkt_overhead+=x->props.header_len;
}

}
}
#endif
/* Increment/randomize headers according to flags and current values
* for IP src/dest, UDP src/dst port, MAC-Addr src/dst
*/
Expand Down Expand Up @@ -2289,6 +2335,10 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
pkt_dev->flows[flow].flags |= F_INIT;
pkt_dev->flows[flow].cur_daddr =
pkt_dev->cur_daddr;
#ifdef CONFIG_XFRM
if (pkt_dev->flags & F_IPSEC_ON)
get_ipsec_sa(pkt_dev, flow);
#endif
pkt_dev->nflows++;
}
}
Expand Down Expand Up @@ -2329,6 +2379,91 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
pkt_dev->flows[flow].count++;
}


#ifdef CONFIG_XFRM
static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
{
struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
int err = 0;
struct iphdr *iph;

if (!x)
return 0;
/* XXX: we dont support tunnel mode for now until
* we resolve the dst issue */
if (x->props.mode != XFRM_MODE_TRANSPORT)
return 0;

spin_lock(&x->lock);
iph = ip_hdr(skb);

err = x->mode->output(x, skb);
if (err)
goto error;
err = x->type->output(x, skb);
if (err)
goto error;

x->curlft.bytes +=skb->len;
x->curlft.packets++;
spin_unlock(&x->lock);

error:
spin_unlock(&x->lock);
return err;
}

static inline void free_SAs(struct pktgen_dev *pkt_dev)
{
if (pkt_dev->cflows) {
/* let go of the SAs if we have them */
int i = 0;
for (; i < pkt_dev->nflows; i++){
struct xfrm_state *x = pkt_dev->flows[i].x;
if (x) {
xfrm_state_put(x);
pkt_dev->flows[i].x = NULL;
}
}
}
}

static inline int process_ipsec(struct pktgen_dev *pkt_dev,
struct sk_buff *skb, __be16 protocol)
{
if (pkt_dev->flags & F_IPSEC_ON) {
struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
int nhead = 0;
if (x) {
int ret;
__u8 *eth;
nhead = x->props.header_len - skb_headroom(skb);
if (nhead >0) {
ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
if (ret < 0) {
printk("Error expanding ipsec packet %d\n",ret);
return 0;
}
}

/* ipsec is not expecting ll header */
skb_pull(skb, ETH_HLEN);
ret = pktgen_output_ipsec(skb, pkt_dev);
if (ret) {
printk("Error creating ipsec packet %d\n",ret);
kfree_skb(skb);
return 0;
}
/* restore ll */
eth = (__u8 *) skb_push(skb, ETH_HLEN);
memcpy(eth, pkt_dev->hh, 12);
*(u16 *) & eth[12] = protocol;
}
}
return 1;
}
#endif

static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev)
{
unsigned i;
Expand Down Expand Up @@ -2512,6 +2647,11 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
pgh->tv_usec = htonl(timestamp.tv_usec);
}

#ifdef CONFIG_XFRM
if (!process_ipsec(pkt_dev, skb, protocol))
return NULL;
#endif

return skb;
}

Expand Down Expand Up @@ -3497,11 +3637,18 @@ static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
}
pkt_dev->entry->proc_fops = &pktgen_if_fops;
pkt_dev->entry->data = pkt_dev;
#ifdef CONFIG_XFRM
pkt_dev->ipsmode = XFRM_MODE_TRANSPORT;
pkt_dev->ipsproto = IPPROTO_ESP;
#endif

return add_dev_to_thread(t, pkt_dev);
out2:
dev_put(pkt_dev->odev);
out1:
#ifdef CONFIG_XFRM
free_SAs(pkt_dev);
#endif
if (pkt_dev->flows)
vfree(pkt_dev->flows);
kfree(pkt_dev);
Expand Down Expand Up @@ -3596,6 +3743,9 @@ static int pktgen_remove_device(struct pktgen_thread *t,
if (pkt_dev->entry)
remove_proc_entry(pkt_dev->entry->name, pg_proc_dir);

#ifdef CONFIG_XFRM
free_SAs(pkt_dev);
#endif
if (pkt_dev->flows)
vfree(pkt_dev->flows);
kfree(pkt_dev);
Expand Down

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