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)  * IPV4 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/udp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static struct sk_buff *esp4_gro_receive(struct list_head *head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 					struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	int offset = skb_gro_offset(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct xfrm_offload *xo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct xfrm_state *x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	__be32 seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	__be32 spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	if (!pskb_pull(skb, offset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	if (!xo || !(xo->flags & CRYPTO_DONE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		struct sec_path *sp = secpath_set(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		if (!sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		if (sp->len == XFRM_MAX_DEPTH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			goto out_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 				      (xfrm_address_t *)&ip_hdr(skb)->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 				      spi, IPPROTO_ESP, AF_INET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		if (!x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 			goto out_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		skb->mark = xfrm_smark_get(skb->mark, x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		sp->xvec[sp->len++] = x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		sp->olen++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		if (!xo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 			goto out_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	xo->flags |= XFRM_GRO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	XFRM_SPI_SKB_CB(skb)->seq = seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	/* We don't need to handle errors from xfrm_input, it does all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	 * the error handling and frees the resources on error. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	xfrm_input(skb, IPPROTO_ESP, spi, -2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	return ERR_PTR(-EINPROGRESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) out_reset:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	secpath_reset(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	skb_push(skb, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	NAPI_GRO_CB(skb)->same_flow = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	return NULL;
^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) static void esp4_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	struct ip_esp_hdr *esph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct iphdr *iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	struct xfrm_offload *xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	int proto = iph->protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	skb_push(skb, -skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	esph = ip_esp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	*skb_mac_header(skb) = IPPROTO_ESP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	esph->spi = x->id.spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	xo->proto = proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static struct sk_buff *xfrm4_tunnel_gso_segment(struct xfrm_state *x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 						struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 						netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	__skb_push(skb, skb->mac_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	return skb_mac_gso_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 						   struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 						   netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	const struct net_offload *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	struct sk_buff *segs = ERR_PTR(-EINVAL);
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	skb->transport_header += x->props.header_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	ops = rcu_dereference(inet_offloads[xo->proto]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (likely(ops && ops->callbacks.gso_segment))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		segs = ops->callbacks.gso_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static struct sk_buff *xfrm4_beet_gso_segment(struct xfrm_state *x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 					      struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 					      netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	struct xfrm_offload *xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	struct sk_buff *segs = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	const struct net_offload *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	u8 proto = xo->proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	skb->transport_header += x->props.header_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (x->sel.family != AF_INET6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		if (proto == IPPROTO_BEETPH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			struct ip_beet_phdr *ph =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				(struct ip_beet_phdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			skb->transport_header += ph->hdrlen * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			proto = ph->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			skb->transport_header -= IPV4_BEET_PHMAXLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		__be16 frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		skb->transport_header +=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			ipv6_skip_exthdr(skb, 0, &proto, &frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		if (proto == IPPROTO_TCP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (proto == IPPROTO_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	__skb_pull(skb, skb_transport_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	ops = rcu_dereference(inet_offloads[proto]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if (likely(ops && ops->callbacks.gso_segment))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		segs = ops->callbacks.gso_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static struct sk_buff *xfrm4_outer_mode_gso_segment(struct xfrm_state *x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 						    struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 						    netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	switch (x->outer_mode.encap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	case XFRM_MODE_TUNNEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		return xfrm4_tunnel_gso_segment(x, skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	case XFRM_MODE_TRANSPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		return xfrm4_transport_gso_segment(x, skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	case XFRM_MODE_BEET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		return xfrm4_beet_gso_segment(x, skb, features);
^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) 	return ERR_PTR(-EOPNOTSUPP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) static struct sk_buff *esp4_gso_segment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 				        netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	struct xfrm_state *x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	struct ip_esp_hdr *esph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	struct crypto_aead *aead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	netdev_features_t esp_features = features;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	struct xfrm_offload *xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	struct sec_path *sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (!xo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	sp = skb_sec_path(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	x = sp->xvec[sp->len - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	aead = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	esph = ip_esp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (esph->spi != x->id.spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	__skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	skb->encap_hdr_csum = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if ((!(skb->dev->gso_partial_features & NETIF_F_HW_ESP) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	     !(features & NETIF_F_HW_ESP)) || x->xso.dev != skb->dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 					    NETIF_F_SCTP_CRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	else if (!(features & NETIF_F_HW_ESP_TX_CSUM) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		 !(skb->dev->gso_partial_features & NETIF_F_HW_ESP_TX_CSUM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		esp_features = features & ~(NETIF_F_CSUM_MASK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 					    NETIF_F_SCTP_CRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	xo->flags |= XFRM_GSO_SEGMENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	return xfrm4_outer_mode_gso_segment(x, skb, esp_features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static int esp_input_tail(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	struct crypto_aead *aead = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	struct xfrm_offload *xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (!(xo->flags & CRYPTO_DONE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		skb->ip_summed = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	return esp_input_done2(skb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static int esp_xmit(struct xfrm_state *x, struct sk_buff *skb,  netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	int alen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	int blksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	struct xfrm_offload *xo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	struct ip_esp_hdr *esph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	struct crypto_aead *aead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	struct esp_info esp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	bool hw_offload = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	__u32 seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	esp.inplace = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (!xo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	if ((!(features & NETIF_F_HW_ESP) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	     !(skb->dev->gso_partial_features & NETIF_F_HW_ESP)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	    x->xso.dev != skb->dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		xo->flags |= CRYPTO_FALLBACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		hw_offload = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	esp.proto = xo->proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	/* skb is pure payload to encrypt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	aead = x->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	alen = crypto_aead_authsize(aead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	esp.tfclen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	/* XXX: Add support for tfc padding here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	blksize = ALIGN(crypto_aead_blocksize(aead), 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	esp.plen = esp.clen - skb->len - esp.tfclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	esp.tailen = esp.tfclen + esp.plen + alen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	esp.esph = ip_esp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (!hw_offload || (hw_offload && !skb_is_gso(skb))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		esp.nfrags = esp_output_head(x, skb, &esp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		if (esp.nfrags < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			return esp.nfrags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	seq = xo->seq.low;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	esph = esp.esph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	esph->spi = x->id.spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	skb_push(skb, -skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	if (xo->flags & XFRM_GSO_SEGMENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		esph->seq_no = htonl(seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		if (!skb_is_gso(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 			xo->seq.low++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 			xo->seq.low += skb_shinfo(skb)->gso_segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	esp.seqno = cpu_to_be64(seq + ((u64)xo->seq.hi << 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	ip_hdr(skb)->tot_len = htons(skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	ip_send_check(ip_hdr(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	if (hw_offload) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		if (!skb_ext_add(skb, SKB_EXT_SEC_PATH))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		xo = xfrm_offload(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		if (!xo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		xo->flags |= XFRM_XMIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	err = esp_output_tail(x, skb, &esp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	secpath_reset(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) static const struct net_offload esp4_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	.callbacks = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		.gro_receive = esp4_gro_receive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		.gso_segment = esp4_gso_segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static const struct xfrm_type_offload esp_type_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	.description	= "ESP4 OFFLOAD",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	.proto	     	= IPPROTO_ESP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	.input_tail	= esp_input_tail,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	.xmit		= esp_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	.encap		= esp4_gso_encap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) static int __init esp4_offload_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	if (xfrm_register_type_offload(&esp_type_offload, AF_INET) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		pr_info("%s: can't add xfrm type offload\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	return inet_add_offload(&esp4_offload, IPPROTO_ESP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) static void __exit esp4_offload_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	xfrm_unregister_type_offload(&esp_type_offload, AF_INET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	inet_del_offload(&esp4_offload, IPPROTO_ESP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) module_init(esp4_offload_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) module_exit(esp4_offload_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET, XFRM_PROTO_ESP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) MODULE_DESCRIPTION("IPV4 GSO/GRO offload support");