Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * IP Payload Compression Protocol (IPComp) - RFC3173.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (c) 2003-2008 Herbert Xu <herbert@gondor.apana.org.au>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Todo:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *   - Tunable compression parameters.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *   - Compression stats.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *   - Adaptive compression.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/crypto.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <net/ipcomp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <net/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) struct ipcomp_tfms {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct crypto_comp * __percpu *tfms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	int users;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static DEFINE_MUTEX(ipcomp_resource_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static void * __percpu *ipcomp_scratches;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static int ipcomp_scratch_users;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static LIST_HEAD(ipcomp_tfms_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct ipcomp_data *ipcd = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	const int plen = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	int dlen = IPCOMP_SCRATCH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	const u8 *start = skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	const int cpu = get_cpu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	if (dlen < (plen + sizeof(struct ip_comp_hdr))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	len = dlen - plen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if (len > skb_tailroom(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		len = skb_tailroom(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	__skb_put(skb, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	len += plen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	skb_copy_to_linear_data(skb, scratch, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	while ((scratch += len, dlen -= len) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		skb_frag_t *frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		err = -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		if (WARN_ON(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		frag = skb_shinfo(skb)->frags + skb_shinfo(skb)->nr_frags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		page = alloc_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		__skb_frag_set_page(frag, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		len = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		if (dlen < len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			len = dlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		skb_frag_off_set(frag, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		skb_frag_size_set(frag, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		memcpy(skb_frag_address(frag), scratch, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		skb->truesize += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		skb->data_len += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		skb->len += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		skb_shinfo(skb)->nr_frags++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	put_cpu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	int nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	int err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	struct ip_comp_hdr *ipch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	if (skb_linearize_cow(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	skb->ip_summed = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	/* Remove ipcomp header and decompress original payload */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	ipch = (void *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	nexthdr = ipch->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	skb->transport_header = skb->network_header + sizeof(*ipch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	__skb_pull(skb, sizeof(*ipch));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	err = ipcomp_decompress(x, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	err = nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) EXPORT_SYMBOL_GPL(ipcomp_input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	struct ipcomp_data *ipcd = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	const int plen = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	int dlen = IPCOMP_SCRATCH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	u8 *start = skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	struct crypto_comp *tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	u8 *scratch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	local_bh_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	scratch = *this_cpu_ptr(ipcomp_scratches);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	tfm = *this_cpu_ptr(ipcd->tfms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if ((dlen + sizeof(struct ip_comp_hdr)) >= plen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		err = -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	local_bh_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	local_bh_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct ip_comp_hdr *ipch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	struct ipcomp_data *ipcd = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (skb->len < ipcd->threshold) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		/* Don't bother compressing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		goto out_ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (skb_linearize_cow(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		goto out_ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	err = ipcomp_compress(x, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		goto out_ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	/* Install ipcomp header, convert into ipcomp datagram. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	ipch = ip_comp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	ipch->nexthdr = *skb_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	ipch->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	ipch->cpi = htons((u16 )ntohl(x->id.spi));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	*skb_mac_header(skb) = IPPROTO_COMP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) out_ok:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	skb_push(skb, -skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) EXPORT_SYMBOL_GPL(ipcomp_output);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) static void ipcomp_free_scratches(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	void * __percpu *scratches;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (--ipcomp_scratch_users)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	scratches = ipcomp_scratches;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (!scratches)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	for_each_possible_cpu(i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		vfree(*per_cpu_ptr(scratches, i));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	free_percpu(scratches);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static void * __percpu *ipcomp_alloc_scratches(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	void * __percpu *scratches;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (ipcomp_scratch_users++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		return ipcomp_scratches;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	scratches = alloc_percpu(void *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	if (!scratches)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	ipcomp_scratches = scratches;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	for_each_possible_cpu(i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		void *scratch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		scratch = vmalloc_node(IPCOMP_SCRATCH_SIZE, cpu_to_node(i));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		if (!scratch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		*per_cpu_ptr(scratches, i) = scratch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	return scratches;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static void ipcomp_free_tfms(struct crypto_comp * __percpu *tfms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	struct ipcomp_tfms *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	list_for_each_entry(pos, &ipcomp_tfms_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		if (pos->tfms == tfms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	WARN_ON(list_entry_is_head(pos, &ipcomp_tfms_list, list));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	if (--pos->users)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	list_del(&pos->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	kfree(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (!tfms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		crypto_free_comp(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	free_percpu(tfms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static struct crypto_comp * __percpu *ipcomp_alloc_tfms(const char *alg_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	struct ipcomp_tfms *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	struct crypto_comp * __percpu *tfms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	list_for_each_entry(pos, &ipcomp_tfms_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		struct crypto_comp *tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		/* This can be any valid CPU ID so we don't need locking. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		tfm = this_cpu_read(*pos->tfms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		if (!strcmp(crypto_comp_name(tfm), alg_name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			pos->users++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			return pos->tfms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	pos = kmalloc(sizeof(*pos), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (!pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	pos->users = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	INIT_LIST_HEAD(&pos->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	list_add(&pos->list, &ipcomp_tfms_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	pos->tfms = tfms = alloc_percpu(struct crypto_comp *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (!tfms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 							    CRYPTO_ALG_ASYNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		if (IS_ERR(tfm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 			goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		*per_cpu_ptr(tfms, cpu) = tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	return tfms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	ipcomp_free_tfms(tfms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static void ipcomp_free_data(struct ipcomp_data *ipcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	if (ipcd->tfms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		ipcomp_free_tfms(ipcd->tfms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	ipcomp_free_scratches();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) void ipcomp_destroy(struct xfrm_state *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	struct ipcomp_data *ipcd = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	if (!ipcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	xfrm_state_delete_tunnel(x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	mutex_lock(&ipcomp_resource_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	ipcomp_free_data(ipcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	mutex_unlock(&ipcomp_resource_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	kfree(ipcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) EXPORT_SYMBOL_GPL(ipcomp_destroy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) int ipcomp_init_state(struct xfrm_state *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	struct ipcomp_data *ipcd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	struct xfrm_algo_desc *calg_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	if (!x->calg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	if (x->encap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	if (!ipcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	mutex_lock(&ipcomp_resource_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	if (!ipcomp_alloc_scratches())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	if (!ipcd->tfms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	mutex_unlock(&ipcomp_resource_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	BUG_ON(!calg_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	ipcd->threshold = calg_desc->uinfo.comp.threshold;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	x->data = ipcd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	ipcomp_free_data(ipcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	mutex_unlock(&ipcomp_resource_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	kfree(ipcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) EXPORT_SYMBOL_GPL(ipcomp_init_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) - RFC3173");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");