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)  *	IPV6 GSO/GRO offload support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *	Linux INET6 implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *      UDPv6 GSO support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/indirect_call_wrapper.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <net/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <net/udp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <net/ip6_checksum.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "ip6_offload.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 					 netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	struct sk_buff *segs = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	unsigned int mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	unsigned int unfrag_ip6hlen, unfrag_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	struct frag_hdr *fptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	u8 *packet_start, *prevhdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	u8 nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	u8 frag_hdr_sz = sizeof(struct frag_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	__wsum csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	int tnl_hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	mss = skb_shinfo(skb)->gso_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	if (unlikely(skb->len <= mss))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (skb->encapsulation && skb_shinfo(skb)->gso_type &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	    (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		segs = skb_udp_tunnel_segment(skb, features, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		const struct ipv6hdr *ipv6h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		struct udphdr *uh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		if (!(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP | SKB_GSO_UDP_L4)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		if (!pskb_may_pull(skb, sizeof(struct udphdr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			return __udp_gso_segment(skb, features, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		/* Do software UFO. Complete and fill in the UDP checksum as HW cannot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		 * do checksum of UDP packets sent as multiple IP fragments.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		uh = udp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		ipv6h = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		uh->check = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		csum = skb_checksum(skb, 0, skb->len, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		uh->check = udp_v6_check(skb->len, &ipv6h->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 					  &ipv6h->daddr, csum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		if (uh->check == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			uh->check = CSUM_MANGLED_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		skb->ip_summed = CHECKSUM_UNNECESSARY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		/* If there is no outer header we can fake a checksum offload
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		 * due to the fact that we have already done the checksum in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		 * software prior to segmenting the frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		if (!skb->encap_hdr_csum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			features |= NETIF_F_HW_CSUM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		/* Check if there is enough headroom to insert fragment header. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		tnl_hlen = skb_tnl_header_len(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		/* Find the unfragmentable header and shift it left by frag_hdr_sz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		 * bytes to insert fragment header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		err = ip6_find_1stfragopt(skb, &prevhdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		unfrag_ip6hlen = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		nexthdr = *prevhdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		*prevhdr = NEXTHDR_FRAGMENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			     unfrag_ip6hlen + tnl_hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		packet_start = (u8 *) skb->head + SKB_GSO_CB(skb)->mac_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		memmove(packet_start-frag_hdr_sz, packet_start, unfrag_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		SKB_GSO_CB(skb)->mac_offset -= frag_hdr_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		skb->mac_header -= frag_hdr_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		skb->network_header -= frag_hdr_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		fptr->nexthdr = nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		fptr->reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		fptr->identification = ipv6_proxy_select_ident(dev_net(skb->dev), skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		/* Fragment the skb. ipv6 header and the remaining fields of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		 * fragment header are updated in ipv6_gso_segment()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		segs = skb_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static struct sock *udp6_gro_lookup_skb(struct sk_buff *skb, __be16 sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 					__be16 dport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	const struct ipv6hdr *iph = skb_gro_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 				 &iph->daddr, dport, inet6_iif(skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 				 inet6_sdif(skb), &udp_table, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) INDIRECT_CALLABLE_SCOPE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct sk_buff *udp6_gro_receive(struct list_head *head, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	struct udphdr *uh = udp_gro_udphdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	struct sock *sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	struct sk_buff *pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (unlikely(!uh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		goto flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	/* Don't bother verifying checksum if we're going to flush anyway. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (NAPI_GRO_CB(skb)->flush)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		goto skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 						 ip6_gro_compute_pseudo))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		goto flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	else if (uh->check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		skb_gro_checksum_try_convert(skb, IPPROTO_UDP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 					     ip6_gro_compute_pseudo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) skip:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	NAPI_GRO_CB(skb)->is_ipv6 = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	if (static_branch_unlikely(&udpv6_encap_needed_key))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		sk = udp6_gro_lookup_skb(skb, uh->source, uh->dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	pp = udp_gro_receive(head, skb, uh, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	return pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) flush:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	if (NAPI_GRO_CB(skb)->is_flist) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		uh->len = htons(skb->len - nhoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			if (skb->csum_level < SKB_MAX_CSUM_LEVEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 				skb->csum_level++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			skb->ip_summed = CHECKSUM_UNNECESSARY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			skb->csum_level = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (uh->check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 					  &ipv6h->daddr, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	return udp_gro_complete(skb, nhoff, udp6_lib_lookup_skb);
^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 const struct net_offload udpv6_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	.callbacks = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		.gso_segment	=	udp6_ufo_fragment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		.gro_receive	=	udp6_gro_receive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		.gro_complete	=	udp6_gro_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) int udpv6_offload_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	return inet6_add_offload(&udpv6_offload, IPPROTO_UDP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) int udpv6_offload_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	return inet6_del_offload(&udpv6_offload, IPPROTO_UDP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }