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Date: Tue, 12 Jun 2007 15:31:44 +0200
From: Robert Olsson <Robert.Olsson@...a.slu.se>
To: hadi@...erus.ca
Cc: Robert Olsson <Robert.Olsson@...a.slu.se>,
David Miller <davem@...emloft.net>,
Herbert Xu <herbert@...dor.apana.org.au>,
netdev@...r.kernel.org, James Morris <jmorris@...ei.org>
Subject: [PATCH] pktgen IPSEC 4/4: Add IPSEC support to pktgen
jamal writes:
> 4 of 4
> [PKTGEN] IPSEC support
> 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@...erus.ca>
Signed-off-by: Robert Olsson <robert.olsson@....uu.se>
Cheers
--ro
>
> diff --git a/net/core/pktgen.c b/net/core/pktgen.c
> index bc4fb3b..bcec8e4 100644
> --- a/net/core/pktgen.c
> +++ b/net/core/pktgen.c
> @@ -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>
> @@ -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)
> @@ -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;
> };
>
> @@ -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];
> };
>
> @@ -704,6 +714,9 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
> seq_printf(seq, "FLOW_RND ");
> }
>
> + if (pkt_dev->flags & F_IPSEC_ON)
> + seq_printf(seq, "IPSEC ");
> +
> if (pkt_dev->flags & F_MACSRC_RND)
> seq_printf(seq, "MACSRC_RND ");
>
> @@ -1198,6 +1211,11 @@ 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;
>
> @@ -1206,7 +1224,7 @@ 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);
> @@ -2094,6 +2112,7 @@ 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);
> @@ -2130,6 +2149,31 @@ 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
> */
> @@ -2289,6 +2333,10 @@ 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++;
> }
> }
> @@ -2329,6 +2377,91 @@ 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;
> @@ -2512,6 +2645,11 @@ 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;
> }
>
> @@ -3493,11 +3631,18 @@ 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);
> @@ -3592,6 +3737,9 @@ 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);
-
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