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)  *	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)  *	TCPv4 GSO/GRO support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/indirect_call_wrapper.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <net/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) static void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 			   unsigned int seq, unsigned int mss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	while (skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 		if (before(ts_seq, seq + mss)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 			skb_shinfo(skb)->tx_flags |= SKBTX_SW_TSTAMP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 			skb_shinfo(skb)->tskey = ts_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 		skb = skb->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 		seq += mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 					netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		const struct iphdr *iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		struct tcphdr *th = tcp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		/* Set up checksum pseudo header, usually expect stack to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		 * have done this already.
^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) 		th->check = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		skb->ip_summed = CHECKSUM_PARTIAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		__tcp_v4_send_check(skb, iph->saddr, iph->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	return tcp_gso_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 				netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	struct sk_buff *segs = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	unsigned int sum_truesize = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	struct tcphdr *th;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	unsigned int thlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	unsigned int seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	__be32 delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	unsigned int oldlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	unsigned int mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	struct sk_buff *gso_skb = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	__sum16 newcheck;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	bool ooo_okay, copy_destructor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	th = tcp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	thlen = th->doff * 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	if (thlen < sizeof(*th))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	if (!pskb_may_pull(skb, thlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	oldlen = (u16)~skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	__skb_pull(skb, thlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	mss = skb_shinfo(skb)->gso_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	if (unlikely(skb->len <= mss))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		/* Packet is from an untrusted source, reset gso_segs. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		segs = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	copy_destructor = gso_skb->destructor == tcp_wfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	ooo_okay = gso_skb->ooo_okay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	/* All segments but the first should have ooo_okay cleared */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	skb->ooo_okay = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	segs = skb_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	if (IS_ERR(segs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	/* Only first segment might have ooo_okay set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	segs->ooo_okay = ooo_okay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	/* GSO partial and frag_list segmentation only requires splitting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	 * the frame into an MSS multiple and possibly a remainder, both
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	 * cases return a GSO skb. So update the mss now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	if (skb_is_gso(segs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		mss *= skb_shinfo(segs)->gso_segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	delta = htonl(oldlen + (thlen + mss));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	skb = segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	th = tcp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	seq = ntohl(th->seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (unlikely(skb_shinfo(gso_skb)->tx_flags & SKBTX_SW_TSTAMP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		tcp_gso_tstamp(segs, skb_shinfo(gso_skb)->tskey, seq, mss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	newcheck = ~csum_fold((__force __wsum)((__force u32)th->check +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 					       (__force u32)delta));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	while (skb->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		th->fin = th->psh = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		th->check = newcheck;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		if (skb->ip_summed == CHECKSUM_PARTIAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			gso_reset_checksum(skb, ~th->check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			th->check = gso_make_checksum(skb, ~th->check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		seq += mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		if (copy_destructor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			skb->destructor = gso_skb->destructor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			skb->sk = gso_skb->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			sum_truesize += skb->truesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		skb = skb->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		th = tcp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		th->seq = htonl(seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		th->cwr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	/* Following permits TCP Small Queues to work well with GSO :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	 * The callback to TCP stack will be called at the time last frag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	 * is freed at TX completion, and not right now when gso_skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	 * is freed by GSO engine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if (copy_destructor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		int delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		swap(gso_skb->sk, skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		swap(gso_skb->destructor, skb->destructor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		sum_truesize += skb->truesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		delta = sum_truesize - gso_skb->truesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		/* In some pathological cases, delta can be negative.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		 * We need to either use refcount_add() or refcount_sub_and_test()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		if (likely(delta >= 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			refcount_add(delta, &skb->sk->sk_wmem_alloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			WARN_ON_ONCE(refcount_sub_and_test(-delta, &skb->sk->sk_wmem_alloc));
^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) 	delta = htonl(oldlen + (skb_tail_pointer(skb) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 				skb_transport_header(skb)) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		      skb->data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	th->check = ~csum_fold((__force __wsum)((__force u32)th->check +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 				(__force u32)delta));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	if (skb->ip_summed == CHECKSUM_PARTIAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		gso_reset_checksum(skb, ~th->check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		th->check = gso_make_checksum(skb, ~th->check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return segs;
^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) struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct sk_buff *pp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	struct sk_buff *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	struct tcphdr *th;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	struct tcphdr *th2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	unsigned int thlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	__be32 flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	unsigned int mss = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	unsigned int hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	unsigned int off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	int flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	off = skb_gro_offset(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	hlen = off + sizeof(*th);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	th = skb_gro_header_fast(skb, off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	if (skb_gro_header_hard(skb, hlen)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		th = skb_gro_header_slow(skb, hlen, off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		if (unlikely(!th))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	thlen = th->doff * 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (thlen < sizeof(*th))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	hlen = off + thlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (skb_gro_header_hard(skb, hlen)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		th = skb_gro_header_slow(skb, hlen, off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		if (unlikely(!th))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	skb_gro_pull(skb, thlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	len = skb_gro_len(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	flags = tcp_flag_word(th);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	list_for_each_entry(p, head, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		if (!NAPI_GRO_CB(p)->same_flow)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		th2 = tcp_hdr(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			NAPI_GRO_CB(p)->same_flow = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	goto out_check_final;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	/* Include the IP ID check below from the inner most IP hdr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	flush = NAPI_GRO_CB(p)->flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	flush |= (__force int)(flags & TCP_FLAG_CWR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		  ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	for (i = sizeof(*th); i < thlen; i += 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		flush |= *(u32 *)((u8 *)th + i) ^
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			 *(u32 *)((u8 *)th2 + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	/* When we receive our second frame we can made a decision on if we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	 * continue this flow as an atomic flow with a fixed ID or if we use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	 * an incrementing ID.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (NAPI_GRO_CB(p)->flush_id != 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	    NAPI_GRO_CB(p)->count != 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	    !NAPI_GRO_CB(p)->is_atomic)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		flush |= NAPI_GRO_CB(p)->flush_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		NAPI_GRO_CB(p)->is_atomic = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	mss = skb_shinfo(p)->gso_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	flush |= (len - 1) >= mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) #ifdef CONFIG_TLS_DEVICE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	flush |= p->decrypted ^ skb->decrypted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if (flush || skb_gro_receive(p, skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		mss = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		goto out_check_final;
^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) 	tcp_flag_word(th2) |= flags & (TCP_FLAG_FIN | TCP_FLAG_PSH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) out_check_final:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	flush = len < mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	flush |= (__force int)(flags & (TCP_FLAG_URG | TCP_FLAG_PSH |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 					TCP_FLAG_RST | TCP_FLAG_SYN |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 					TCP_FLAG_FIN));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	if (p && (!NAPI_GRO_CB(skb)->same_flow || flush))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		pp = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	NAPI_GRO_CB(skb)->flush |= (flush != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	return pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) int tcp_gro_complete(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	struct tcphdr *th = tcp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	skb->csum_start = (unsigned char *)th - skb->head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	skb->csum_offset = offsetof(struct tcphdr, check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	skb->ip_summed = CHECKSUM_PARTIAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (th->cwr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	if (skb->encapsulation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		skb->inner_transport_header = skb->transport_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) EXPORT_SYMBOL(tcp_gro_complete);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) INDIRECT_CALLABLE_SCOPE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) struct sk_buff *tcp4_gro_receive(struct list_head *head, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	/* Don't bother verifying checksum if we're going to flush anyway. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	if (!NAPI_GRO_CB(skb)->flush &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	    skb_gro_checksum_validate(skb, IPPROTO_TCP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 				      inet_gro_compute_pseudo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	return tcp_gro_receive(head, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	const struct iphdr *iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	struct tcphdr *th = tcp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 				  iph->daddr, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	if (NAPI_GRO_CB(skb)->is_atomic)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_FIXEDID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	return tcp_gro_complete(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static const struct net_offload tcpv4_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	.callbacks = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		.gso_segment	=	tcp4_gso_segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		.gro_receive	=	tcp4_gro_receive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		.gro_complete	=	tcp4_gro_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) int __init tcpv4_offload_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	return inet_add_offload(&tcpv4_offload, IPPROTO_TCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }