Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * IPV6 GSO/GRO offload support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Linux INET implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 2016 secunet Security Networks AG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Author: Steffen Klassert <steffen.klassert@secunet.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * ESP GRO support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <crypto/aead.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <crypto/authenc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <net/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <net/esp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/scatterlist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <net/ip6_route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <net/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/icmpv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static __u16 esp6_nexthdr_esp_offset(struct ipv6hdr *ipv6_hdr, int nhlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	int off = sizeof(struct ipv6hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct ipv6_opt_hdr *exthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (likely(ipv6_hdr->nexthdr == NEXTHDR_ESP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		return offsetof(struct ipv6hdr, nexthdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	while (off < nhlen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		exthdr = (void *)ipv6_hdr + off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		if (exthdr->nexthdr == NEXTHDR_ESP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 			return off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		off += ipv6_optlen(exthdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static struct sk_buff *esp6_gro_receive(struct list_head *head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 					struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	int offset = skb_gro_offset(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	struct xfrm_offload *xo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	struct xfrm_state *x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	__be32 seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	__be32 spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	int nhoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if (!pskb_pull(skb, offset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (!xo || !(xo->flags & CRYPTO_DONE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		struct sec_path *sp = secpath_set(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		if (!sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		if (sp->len == XFRM_MAX_DEPTH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 			goto out_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 				      (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 				      spi, IPPROTO_ESP, AF_INET6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		if (!x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			goto out_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		skb->mark = xfrm_smark_get(skb->mark, x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		sp->xvec[sp->len++] = x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		sp->olen++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		if (!xo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			goto out_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	xo->flags |= XFRM_GRO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	nhoff = esp6_nexthdr_esp_offset(ipv6_hdr(skb), offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (!nhoff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	IP6CB(skb)->nhoff = nhoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	XFRM_SPI_SKB_CB(skb)->seq = seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	/* We don't need to handle errors from xfrm_input, it does all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	 * the error handling and frees the resources on error. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	xfrm_input(skb, IPPROTO_ESP, spi, -2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	return ERR_PTR(-EINPROGRESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) out_reset:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	secpath_reset(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	skb_push(skb, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	NAPI_GRO_CB(skb)->same_flow = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	struct ip_esp_hdr *esph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	struct ipv6hdr *iph = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	struct xfrm_offload *xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	u8 proto = iph->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	skb_push(skb, -skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (x->outer_mode.encap == XFRM_MODE_TRANSPORT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		__be16 frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto, &frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	esph = ip_esp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	*skb_mac_header(skb) = IPPROTO_ESP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	esph->spi = x->id.spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	xo->proto = proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static struct sk_buff *xfrm6_tunnel_gso_segment(struct xfrm_state *x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 						struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 						netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	__skb_push(skb, skb->mac_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	return skb_mac_gso_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static struct sk_buff *xfrm6_transport_gso_segment(struct xfrm_state *x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 						   struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 						   netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	const struct net_offload *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	struct sk_buff *segs = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	struct xfrm_offload *xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	skb->transport_header += x->props.header_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	ops = rcu_dereference(inet6_offloads[xo->proto]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (likely(ops && ops->callbacks.gso_segment))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		segs = ops->callbacks.gso_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	return segs;
^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) static struct sk_buff *xfrm6_beet_gso_segment(struct xfrm_state *x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 					      struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 					      netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	struct xfrm_offload *xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	struct sk_buff *segs = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	const struct net_offload *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	u8 proto = xo->proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	skb->transport_header += x->props.header_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (x->sel.family != AF_INET6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		skb->transport_header -=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			(sizeof(struct ipv6hdr) - sizeof(struct iphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		if (proto == IPPROTO_BEETPH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			struct ip_beet_phdr *ph =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 				(struct ip_beet_phdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			skb->transport_header += ph->hdrlen * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			proto = ph->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			skb->transport_header -= IPV4_BEET_PHMAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		if (proto == IPPROTO_TCP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		__be16 frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		skb->transport_header +=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			ipv6_skip_exthdr(skb, 0, &proto, &frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (proto == IPPROTO_IPIP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	__skb_pull(skb, skb_transport_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	ops = rcu_dereference(inet6_offloads[proto]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (likely(ops && ops->callbacks.gso_segment))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		segs = ops->callbacks.gso_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static struct sk_buff *xfrm6_outer_mode_gso_segment(struct xfrm_state *x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 						    struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 						    netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	switch (x->outer_mode.encap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	case XFRM_MODE_TUNNEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return xfrm6_tunnel_gso_segment(x, skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	case XFRM_MODE_TRANSPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		return xfrm6_transport_gso_segment(x, skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	case XFRM_MODE_BEET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		return xfrm6_beet_gso_segment(x, skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	return ERR_PTR(-EOPNOTSUPP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static struct sk_buff *esp6_gso_segment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 				        netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	struct xfrm_state *x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	struct ip_esp_hdr *esph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	struct crypto_aead *aead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	netdev_features_t esp_features = features;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	struct xfrm_offload *xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	struct sec_path *sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if (!xo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	sp = skb_sec_path(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	x = sp->xvec[sp->len - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	aead = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	esph = ip_esp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (esph->spi != x->id.spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	__skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	skb->encap_hdr_csum = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 					    NETIF_F_SCTP_CRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	else if (!(features & NETIF_F_HW_ESP_TX_CSUM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		esp_features = features & ~(NETIF_F_CSUM_MASK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 					    NETIF_F_SCTP_CRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	xo->flags |= XFRM_GSO_SEGMENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	return xfrm6_outer_mode_gso_segment(x, skb, esp_features);
^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 int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	struct crypto_aead *aead = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	struct xfrm_offload *xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	if (!(xo->flags & CRYPTO_DONE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		skb->ip_summed = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	return esp6_input_done2(skb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb,  netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	int alen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	int blksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	struct xfrm_offload *xo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	struct crypto_aead *aead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	struct esp_info esp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	bool hw_offload = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	__u32 seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	esp.inplace = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	if (!xo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		xo->flags |= CRYPTO_FALLBACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		hw_offload = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	esp.proto = xo->proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	/* skb is pure payload to encrypt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	aead = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	alen = crypto_aead_authsize(aead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	esp.tfclen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	/* XXX: Add support for tfc padding here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	blksize = ALIGN(crypto_aead_blocksize(aead), 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	esp.plen = esp.clen - skb->len - esp.tfclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	esp.tailen = esp.tfclen + esp.plen + alen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	if (!hw_offload || (hw_offload && !skb_is_gso(skb))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		esp.nfrags = esp6_output_head(x, skb, &esp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		if (esp.nfrags < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 			return esp.nfrags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	seq = xo->seq.low;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	esp.esph = ip_esp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	esp.esph->spi = x->id.spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	skb_push(skb, -skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	if (xo->flags & XFRM_GSO_SEGMENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		esp.esph->seq_no = htonl(seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		if (!skb_is_gso(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 			xo->seq.low++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 			xo->seq.low += skb_shinfo(skb)->gso_segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	len = skb->len - sizeof(struct ipv6hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	if (len > IPV6_MAXPLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	ipv6_hdr(skb)->payload_len = htons(len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	if (hw_offload) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		if (!skb_ext_add(skb, SKB_EXT_SEC_PATH))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		if (!xo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		xo->flags |= XFRM_XMIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	err = esp6_output_tail(x, skb, &esp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	secpath_reset(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) static const struct net_offload esp6_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	.callbacks = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		.gro_receive = esp6_gro_receive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		.gso_segment = esp6_gso_segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) static const struct xfrm_type_offload esp6_type_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	.description	= "ESP6 OFFLOAD",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	.proto	     	= IPPROTO_ESP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	.input_tail	= esp6_input_tail,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	.xmit		= esp6_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	.encap		= esp6_gso_encap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) static int __init esp6_offload_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		pr_info("%s: can't add xfrm type offload\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	return inet6_add_offload(&esp6_offload, IPPROTO_ESP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) static void __exit esp6_offload_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	inet6_del_offload(&esp6_offload, IPPROTO_ESP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) module_init(esp6_offload_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) module_exit(esp6_offload_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET6, XFRM_PROTO_ESP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) MODULE_DESCRIPTION("IPV6 GSO/GRO offload support");